Disclosure of Invention
The application provides an energy storage system and a control method and device of an energy storage converter, which can solve the problem of equipment damage possibly caused by on-load breaking.
The application provides an energy storage system and a control method of an energy storage converter in a first aspect, the method is applied to a server, and the method comprises the following steps: responding to a first closing instruction aiming at the energy storage converter, acquiring a first voltage value and a second voltage value, wherein the first voltage value is the current voltage value of a first storage battery, the second voltage value is the current voltage value of a second storage battery, and the first storage battery and the second storage battery are any two storage batteries which are connected with the energy storage converter and can form a loop; judging whether the first voltage value is equal to the second voltage value; if the first voltage value is not equal to the second voltage value, acquiring the current intensity of a loop, wherein the current intensity of the loop is the intensity value of the current in the loop formed by the first storage battery and the second storage battery; judging whether the loop current intensity is smaller than or equal to a preset first threshold value; if the loop current intensity is smaller than or equal to a preset first threshold value, a first closing instruction is sent to the energy storage converter; and sending a second closing instruction to the contactor so as to disconnect a loop formed by the first storage battery and the second storage battery.
By adopting the technical scheme, the server can respond to the instruction of closing the energy storage converter to acquire the current voltage value of each storage battery in the energy storage system, when voltage difference exists between different storage batteries and a loop can be formed, the loop can form a circulating current after the energy storage converter is closed, and the circulating current can be damaged or even burnt when the current intensity is higher; when the voltage difference is judged to exist, the current intensity in the loop is automatically obtained, and whether the current intensity is too high (namely, whether the current intensity is larger than a first threshold value) is judged; when the current intensity is not too high, a first closing instruction is sent to the energy storage converter; then a second closing instruction is sent to the contactor to close the energy storage converter successively, and the contactor preset in the disconnecting loop is disconnected, so that the contactor can be successfully loaded and disconnected within the rated breaking current intensity range, and the equipment cannot be damaged due to electric arcs generated by the breaking of the contactor; the technical scheme can automatically judge whether the circulation is generated or not and judge the current intensity of the circulation when the energy storage converter needs to be closed, automatically judge whether the energy storage converter can be directly closed or the contactor can be disconnected according to the current intensity, and further protect the equipment such as the contactor and the like from being damaged due to the circulation.
Optionally, after determining whether the first voltage value and the second voltage value are equal, the method further includes: if the first voltage value is equal to the second voltage value, determining that no potential difference exists between the first storage battery and the second storage battery; sending a first closing instruction to an energy storage converter; and sending a second closing instruction to the contactor.
By adopting the technical scheme, the server can directly give the closing instruction under the condition that the voltage values of the storage batteries are equal, and does not need to try to acquire the current and judge, namely the judging processing efficiency of the server under the condition that no circulation exists is improved.
Optionally, if the first voltage value is not equal to the second voltage value, obtaining the loop current intensity specifically includes: if the first voltage value is not equal to the second voltage value, comparing the magnitudes of the first voltage value and the second voltage value; if the first voltage value is larger than the second voltage value, determining the current direction of the circulating current as from the first storage battery to the second storage battery, and obtaining a voltage difference value, wherein the voltage difference value is obtained by subtracting the second voltage value from the first voltage value; acquiring a loop resistance value, wherein the loop resistance value is the total resistance value in a loop formed by the first storage battery and the second storage battery; and obtaining the loop current intensity according to the voltage difference value and the loop resistance value.
By adopting the technical scheme, the server can calculate the loop current intensity through the resistance in the loop formed by the storage batteries and the voltage difference between the storage batteries, and the scheme can obtain the current intensity of the loop current which can exist after the energy storage converter is closed more quickly.
Optionally, after determining whether the loop current intensity is less than or equal to the preset first threshold, the method further includes: if the current intensity of the loop is greater than a preset first threshold value, displaying prompt information to a user, wherein the prompt information is used for prompting the user that if the energy storage converter is closed, circulating current which can damage equipment is generated between the storage batteries; and responding to a command of forcibly closing the energy storage converter sent by a user, and sending a first closing command to the energy storage converter.
By adopting the technical scheme, when the loop current intensity is higher, namely, the loop current intensity is larger than a preset first threshold value, equipment is damaged by the loop current, even fire hazard is caused by the fact that a large amount of heat is generated, at the moment, a server intercepts an instruction for closing the energy storage converter and displays prompt information to a user for reminding, so that the condition of burning loss of the equipment is avoided to a certain extent; the server is also capable of shutting down the energy storage converter in response to a forced shutdown command by the user.
Optionally, after if the loop current intensity is less than or equal to a preset first threshold value, sending a first closing instruction to the energy storage converter; sending a second close command to the contactor specifically includes: judging whether the current intensity of the loop is larger than a preset second threshold value, wherein the preset second threshold value is a rated breaking current intensity value of the contactor; if the current intensity of the loop is greater than a preset second threshold value, determining that the contactor cannot guarantee that the arc extinguishing process is finished currently, and sending a first closing instruction to the energy storage converter; and after the first preset time period passes, sending a second closing instruction to the contactor.
By adopting the technical scheme, when the server judges that the current intensity of the loop is larger than the preset second threshold, namely larger than the maximum current intensity which can be disconnected by the contactor, arc extinction cannot be ensured by the contactor when the current intensity is larger than the threshold, and at the moment, after the server sends a first closing instruction to the energy storage converter, the loop current is generated for a period of time, namely after the first preset time period, the current intensity of the loop current is smaller than or equal to the preset second threshold, and then the second closing instruction is sent to the contactor, so that the contactor is disconnected, and the success rate of disconnecting the loop current by the contactor is ensured.
Optionally, after determining whether the loop current intensity is greater than the preset second threshold, the method further includes: and if the loop current intensity is smaller than or equal to a preset second threshold value, sending a first closing instruction to the energy storage converter and sending a second closing instruction to the contactor.
By adopting the technical scheme, when the server judges the current intensity of the circulating current, namely the current intensity of the circulating current is smaller than or equal to the preset second threshold value, the contactor can successfully break the circulating current, and at the moment, the server sends the first closing instruction to the energy storage converter and then directly sends the second closing instruction to the contactor.
Optionally, if the loop current intensity is less than or equal to a preset second threshold, sending a first closing instruction to the energy storage converter and sending a second closing instruction to the contactor, including: if the loop current intensity is smaller than or equal to a preset second threshold value, judging whether a user starts a contactor protection mode, wherein the contactor protection mode is a mode for reducing the loss probability of a contactor under the condition of non-emergency closing; if the user opens the contactor protection mode, a first closing instruction is sent to the energy storage converter; and after a second preset time period, sending a second closing instruction to the contactor.
By adopting the technical scheme, the server can delay to close the contactor according to the contactor protection mode set by a user under the condition of not closing the energy storage converter emergently, so that the contactor is disconnected under the condition of no circulation, and the loss of the circulation to the contactor is avoided.
The application provides a control device of an energy storage system and an energy storage converter in a second aspect, wherein the device is a server, and the server comprises an acquisition unit and a processing unit;
the acquisition unit is used for responding to a first closing instruction aiming at the energy storage converter, acquiring a first voltage value and a second voltage value, wherein the first voltage value is the current voltage value of the first storage battery, the second voltage value is the current voltage value of the second storage battery, and the first storage battery and the second storage battery are any two storage batteries which can form a loop and are connected with the energy storage converter; and the circuit current intensity is the intensity value of the current in the circuit formed by the first storage battery and the second storage battery if the first voltage value is not equal to the second voltage value.
The processing unit is used for judging whether the first voltage value is equal to the second voltage value; the method is also used for judging whether the loop current intensity is smaller than or equal to a preset first threshold value; the method is also used for sending a first closing instruction to the energy storage converter if the loop current intensity is smaller than or equal to a preset first threshold value; and sending a second closing instruction to the contactor so as to disconnect a loop formed by the first storage battery and the second storage battery.
Optionally, the processing unit is configured to determine that there is no potential difference between the first storage battery and the second storage battery if the first voltage value is equal to the second voltage value; sending a first closing instruction to an energy storage converter; and sending a second closing instruction to the contactor.
Optionally, the processing unit is configured to compare the first voltage value and the second voltage value if the first voltage value and the second voltage value are not equal; the acquisition unit is used for determining the current direction of the circulating current from the first storage battery to the second storage battery if the first voltage value is larger than the second voltage value, and acquiring a voltage difference value, wherein the voltage difference value is obtained by subtracting the second voltage value from the first voltage value; acquiring a loop resistance value, wherein the loop resistance value is the total resistance value in a loop formed by the first storage battery and the second storage battery; and obtaining the loop current intensity according to the voltage difference value and the loop resistance value.
Optionally, the processing unit is configured to display a prompt message to a user if the loop current intensity is greater than a preset first threshold, where the prompt message is used to prompt the user that if the energy storage converter is turned off, a circulation current that can damage the device is generated between the storage batteries; and responding to a command of forcibly closing the energy storage converter sent by a user, and sending a first closing command to the energy storage converter.
Optionally, the processing unit is configured to determine whether the loop current intensity is greater than a preset second threshold, where the preset second threshold is a rated open current intensity value of the contactor; if the current intensity of the loop is greater than a preset second threshold value, determining that the contactor cannot guarantee that the arc extinguishing process is finished currently, and sending a first closing instruction to the energy storage converter; and after the first preset time period passes, sending a second closing instruction to the contactor.
Optionally, the processing unit is configured to send a first closing instruction to the energy storage converter and send a second closing instruction to the contactor if the loop current intensity is less than or equal to a preset second threshold.
Optionally, the processing unit is configured to determine whether the user opens a contactor protection mode if the loop current intensity is less than or equal to a preset second threshold, where the contactor protection mode is a mode for reducing a contactor loss probability under a non-emergency closing condition; if the user opens the contactor protection mode, a first closing instruction is sent to the energy storage converter; and after a second preset time period, sending a second closing instruction to the contactor.
The present application provides in a third aspect an electronic device comprising a processor, a memory, a user interface and a network interface, the memory being for storing instructions, the user interface and the network interface being for communicating with other devices, the processor being for executing the instructions stored in the memory to cause the electronic device to perform the method of any one of the possible implementations of the first aspect or the first aspect as above.
The present application provides in a fourth aspect a computer readable storage medium storing a computer program for execution by a processor as described above or any one of the possible implementation methods of the first aspect.
In summary, one or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
1. the server can respond to the instruction of closing the energy storage converter to acquire the current voltage value of each storage battery in the energy storage system, when voltage differences exist between different storage batteries and a loop can be formed, the loop can form a circulating current after the energy storage converter is closed, and the circulating current can be damaged or even burnt when the current intensity is higher; when the voltage difference is judged to exist, the current intensity in the loop is automatically obtained, and whether the current intensity is too high (namely, whether the current intensity is larger than a first threshold value) is judged; when the current intensity is not too high, a first closing instruction is sent to the energy storage converter; then a second closing instruction is sent to the contactor to close the energy storage converter successively, and the contactor preset in the disconnecting loop is disconnected, so that the contactor can be successfully loaded and disconnected within the rated breaking current intensity range, and the equipment cannot be damaged due to electric arcs generated by the breaking of the contactor; the technical scheme can automatically judge whether the circulation is generated or not and judge the current intensity of the circulation when the energy storage converter needs to be closed, automatically judge whether the energy storage converter can be directly closed or the contactor can be disconnected according to the current intensity, and further protect the equipment such as the contactor and the like from being damaged due to the circulation.
2. When the current intensity of the loop is judged to be larger than a preset second threshold, namely, larger than the maximum current intensity which can be disconnected by the contactor, arc extinction cannot be guaranteed by the contactor, at the moment, after a first closing instruction is sent to the energy storage converter by the server, circulation is generated for a period of time, namely, after the first preset period of time, the current intensity of the circulation is smaller than or equal to the preset second threshold, and then the second closing instruction is sent to the contactor, so that the contactor is disconnected, and the success rate of disconnecting the circulation of the contactor is guaranteed.
3. When the loop current intensity is higher, namely, the loop current intensity is larger than a preset first threshold value, equipment is damaged by the loop current, even fire hazard is caused by the fact that a large amount of heat is generated, at the moment, a server intercepts an instruction for closing the energy storage converter and displays prompt information to a user for reminding, and the condition of burning of the equipment is avoided to a certain extent; the server is also capable of shutting down the energy storage converter in response to a forced shutdown command by the user.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments.
In the description of embodiments of the present application, words such as "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described herein as "such as" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "or" for example "is intended to present related concepts in a concrete fashion.
In the description of the embodiments of the present application, the term "plurality" means two or more. For example, a plurality of systems means two or more systems, and a plurality of screen terminals means two or more screen terminals. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating an indicated technical feature. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
When the PCS needs to be closed, if the potential difference exists between two storage batteries connected with the PCS, circulation current exists in a loop formed by the two storage batteries; in consideration of the fact that current impact can be caused to the storage battery and the PCS by circulation, workers can control the contactor to carry out load breaking so as to protect equipment; but this may damage the contactor and even create arcing hazards. Therefore, the embodiment provides an energy storage system and a control method of an energy storage converter.
Referring to fig. 1, fig. 1 is a schematic flow chart of a control method of an energy storage system and an energy storage converter, which is provided in an embodiment of the present application, and is applied to a server. The method includes steps S101 to S105.
S101, responding to a first closing instruction aiming at the energy storage converter, acquiring a first voltage value and a second voltage value, wherein the first voltage value is the current voltage value of the first storage battery, the second voltage value is the current voltage value of the second storage battery, and the first storage battery and the second storage battery are any two storage batteries which are connected with the energy storage converter and can form a loop.
In the above steps, the server responds to the instruction of closing the energy storage converter, and measures the voltage value of the storage battery through the voltage meter or the alternating-current millivolt meter and other devices which are preset at the two ends of the storage battery, and it should be noted that, for convenience of explanation, only the situation that the energy storage converter is connected with two storage batteries to obtain the voltages of the two storage batteries is listed, and in actual use, the energy storage converter can be connected with more than two storage batteries in parallel to charge and discharge, and the method is still applicable to the situation of more than two storage batteries; in addition, the two storage batteries need to form a loop, and the situation that the loop cannot be generated due to the fact that the loop is not formed is not considered in the scheme.
For example, referring to fig. 2, fig. 2 is a circuit diagram of an energy storage system according to an embodiment of the present application; wherein B1 is a first storage battery, and B2 is a second storage battery; r1 is the resistance or the electrical appliance of a first branch where the first storage battery is located, and R2 is the resistance or the electrical appliance of a second branch where the second storage battery is located; s1 is a first contactor on a first branch, S2 is a second contactor on a second branch; the PCS is an energy storage converter and is used for charging B1 and B2 and receiving electric energy emitted by B1 and B2; s3 is a switch of the PCS, in practical cases, the PCS is integrated with the switch, and in the scheme of the embodiment, the instruction for closing the energy storage converter is to control the S3 to be disconnected. In this step, the server acquires that the voltage of B1 is 10V and the voltage of B2 is 6V through the voltmeter. In the case where PCS, B1 and B2 are all operating, the current directions of B1 and B2 are identical, e.g., at a certain time, the current direction through B1 is from S1 to R1, and the current direction through B2 is from S2 to R2; when the PCS is turned off, a loop current exists in a loop formed by B1 and B2 (because there is a potential difference between B1 and B2), in this embodiment, since the voltage of B1 is higher, the loop current is in the direction of B1→s1→s2→b2→r2→r1→b1, because the loop current may cause waste of electric energy in the storage battery and may cause overheating of the circuit to generate a safety problem, so after the PCS is turned off, the S1 and the S2 are also required to be turned off, i.e. the two contactors are turned off (load breaking), the upper limits of the current intensity born by the contactors with different specifications are different, when the current intensity is greater than the maximum current born by the contactors, the contactors cannot guarantee arc extinction, i.e. the circuit is smoothly turned off, and the contactor may be broken to generate high temperature and high heat, which is the case of arc-breaking, and the contactor is the case that is intended to be solved and avoided in this embodiment.
S102, judging whether the first voltage value is equal to the second voltage value.
In one possible embodiment, after determining whether the first voltage value and the second voltage value are equal, the method further comprises: if the first voltage value is equal to the second voltage value, determining that no potential difference exists between the first storage battery and the second storage battery; sending a first closing instruction to an energy storage converter; and sending a second closing instruction to the contactor.
Specifically, if the server determines that the voltages of the two storage batteries are the same, after the PCS is turned off, no circulating current is generated in the loop formed by the first storage battery and the second storage battery, and at this time, the first turn-off command and the second turn-off command can be directly sent to control the PCS to be turned off and the contactor to disconnect the loop, and no circulating current is generated, so that the influence of the circulating current on the disconnection of the contactor is not required to be considered.
And S103, if the first voltage value is not equal to the second voltage value, acquiring the loop current intensity, wherein the loop current intensity is the intensity value of the current in the loop formed by the first storage battery and the second storage battery.
In the above steps, when the server determines that the voltages of the storage batteries are different, the current intensity between the storage batteries with different voltages and capable of forming a loop, that is, the loop current intensity, is required to be described, where the current intensity obtained by the loop is not the current intensity when the loop is not generated under the PCS operation, but the current intensity of the loop which is expected to appear in the loop after the PCS is closed; for convenience of explanation, the case that two storage batteries have different voltages and can form a loop is taken as an example, in practical situations, a situation that one storage battery has a higher voltage and a plurality of storage batteries have a lower voltage may be allowed to occur, for example, the voltage of the storage battery A is 10V, the voltage of the storage battery B is 6V, and the voltage of the storage battery C is 5V, where the storage battery A and the storage battery C may form a loop, so after the PCS is turned off, a loop in the direction from the storage battery A to the storage battery C may be formed.
In one possible embodiment, if the first voltage value is not equal to the second voltage value, the loop current strength is obtained, which specifically includes: if the first voltage value is not equal to the second voltage value, comparing the magnitudes of the first voltage value and the second voltage value; if the first voltage value is larger than the second voltage value, determining the current direction of the circulating current as from the first storage battery to the second storage battery, and obtaining a voltage difference value, wherein the voltage difference value is obtained by subtracting the second voltage value from the first voltage value; acquiring a loop resistance value, wherein the loop resistance value is the total resistance value in a loop formed by the first storage battery and the second storage battery; and obtaining the loop current intensity according to the voltage difference value and the loop resistance value.
Specifically, since the circulating current is not generated yet when this step is performed, this step predicts the current intensity of the circulating current by calculation, not directly obtained by measurement using an instrument; the specific calculation mode is to divide the voltage difference of the two storage batteries by the resistance value in the loop, wherein the resistance value comprises the resistance value of the electric appliance or the resistor in the loop.
In the above example, the voltage of B1 is 10V, the voltage of B2 is 6V, the voltage difference is 4V, the total resistance value of R1 and R2 is 1 Ω, and the magnitude of the circulating current intensity (i.e., the loop current intensity) is 4A.
S104, judging whether the loop current intensity is smaller than or equal to a preset first threshold value.
In the above steps, the server judges whether the current intensity of the loop is smaller than or equal to a preset first threshold value, and the preset first threshold value is set according to the current intensity which can enable the wire to excessively heat or even easily generate fire and damage the load equipment, so that the server can judge whether the loop has short circuit or the resistance value of the electrical appliance is too small according to the current intensity; that is, before the PCS is not turned off, it is determined in advance whether the loop current intensity is so high that a safety problem is generated, so that the generation of the safety problem is prevented.
In the above example, the first threshold is preset to be 20A, and it is determined whether the loop current intensity is less than 20A.
In one possible embodiment, after determining whether the loop current strength is less than or equal to the preset first threshold, the method further comprises: if the current intensity of the loop is greater than a preset first threshold value, displaying prompt information to a user, wherein the prompt information is used for prompting the user that if the energy storage converter is closed, circulating current which can damage equipment is generated between the storage batteries; and responding to a command of forcibly closing the energy storage converter sent by a user, and sending a first closing command to the energy storage converter.
Specifically, when the current intensity of the loop is too high, i.e. is greater than a preset first threshold value, it is indicated that after the PCS is closed, a circulation current with stronger current intensity is generated, and then the safety problem is caused by overheating of the circuit; the method comprises the steps of sending and displaying prompt information to a user, wherein the display mode comprises, but is not limited to, displaying on a mobile terminal of the user so as to prompt the user that a high safety risk exists in a current PCS closing instruction, and suggesting to check whether a loop in which a loop is located is not provided with a resistor or an electrical appliance, or a short circuit condition exists; after the user confirms that there is no safety issue or other condition, the server may also respond to an instruction to forcibly turn off the energy storage converter (i.e., PCS) to turn off the energy storage converter.
S105, if the loop current intensity is smaller than or equal to a preset first threshold value, a first closing instruction is sent to the energy storage converter; and sending a second closing instruction to the contactor so as to disconnect a loop formed by the first storage battery and the second storage battery.
In the above step, when the loop current intensity is smaller than or equal to the preset first threshold, it is indicated that the loop current generated after the PCS is turned off will not cause the problem of overheating of the line, and at this time, the energy storage converter is turned off first by sending the first turn-off command and the second turn-off command, and then the loop formed by the first storage battery and the second storage battery is disconnected.
In the above example, the loop current intensity 4A is less than the preset first threshold 20A, sending a first shutdown command to the PCS, i.e. to open S3, and sending a second shutdown command to the first battery and the second battery, i.e. to open at least one contactor of S1 and S2.
In one possible embodiment, after the loop current intensity is less than or equal to a preset first threshold value, a first closing command is sent to the energy storage converter; sending a second close command to the contactor specifically includes: judging whether the current intensity of the loop is larger than a preset second threshold value, wherein the preset second threshold value is a rated breaking current intensity value of the contactor; if the current intensity of the loop is greater than a preset second threshold value, determining that the contactor cannot guarantee that the arc extinguishing process is finished currently, and sending a first closing instruction to the energy storage converter; and after the first preset time period passes, sending a second closing instruction to the contactor.
Specifically, after the loop current intensity is less than or equal to the preset first threshold, further considering the relation between the loop current intensity and the preset second threshold, where the preset second threshold is the maximum current intensity that the S1 or S2 switch can support to open, and beyond the threshold, the switch cannot guarantee to completely extinguish the arc, so that an arc-striking risk is generated (that is, an arc is generated between contacts of the contactor when the current is opened, that is, a phenomenon of generating a cluster of high Wen Gaoliang gas, which is mostly used in the scenes of electric welding, etc., the contacts are worn or even melted due to the arc, so that each contactor has an upper limit of the current intensity that can be opened); when the loop current intensity is greater than the second preset threshold value, after the first closing instruction is sent to the PCS, the second closing instruction is sent to the contactor after the first preset time period is delayed, so that the characteristic of circulation is considered, the circulation can enable the voltage of the storage battery with higher voltage to be reduced to the voltage of the storage battery with lower voltage, namely, until the voltages of the two storage batteries are the same, no circulation is generated, in the case, the loop current intensity is not greater than the preset first threshold value, circuit equipment is not damaged due to the fact that the loop current is too strong, and therefore, the situation of the embodiment is different from the situation of being greater than the preset first threshold value, after the PCS is closed, the loop current intensity is allowed to be reduced to the range that the contactor can be opened; the first preset time period is the time required for the loop current intensity to drop to the maximum current intensity at which the contactors (i.e., S1 and S2) can be opened, and the specific time period can be set by the staff according to the actual situation, which is not limited herein.
In one possible embodiment, after determining whether the loop current strength is greater than a preset second threshold, the method further comprises: and if the loop current intensity is smaller than or equal to a preset second threshold value, sending a first closing instruction to the energy storage converter and sending a second closing instruction to the contactor.
Specifically, when the server judges that the loop current intensity is smaller than or equal to a preset second threshold value, the contactor is indicated to break the current loop current of the current intensity, the energy storage converter is closed by sending a first closing instruction, the contactor is broken by sending a second closing instruction, and the current loop is cut off.
In one possible implementation manner, if the loop current intensity is less than or equal to a preset second threshold value, the first closing instruction is sent to the energy storage converter, and the second closing instruction is sent to the contactor, which specifically includes: if the loop current intensity is smaller than or equal to a preset second threshold value, judging whether a user starts a contactor protection mode, wherein the contactor protection mode is a mode for reducing the loss probability of a contactor under the condition of non-emergency closing; if the user opens the contactor protection mode, a first closing instruction is sent to the energy storage converter; and after a second preset time period, sending a second closing instruction to the contactor.
In particular, the user or staff may set the contactor protection mode before this embodiment, i.e. in case of non-emergency situations other than emergency situations (including situations where the loop current intensity is greater than a preset first threshold or a preset second threshold), the contactor is preferentially opened when no current passes, so that no arc is generated, i.e. loss of the contactor is minimized; therefore, after the first closing instruction is sent to the energy storage converter, after a second preset time period passes, the second closing instruction is sent to the contactor to open the contactor, and the second preset time period can be set by a worker according to parameters such as a circuit resistance value.
The application also provides a control device of the energy storage system and the energy storage converter, which comprises an acquisition unit 301 and a processing unit 302, and refer to fig. 3.
The obtaining unit 301 is configured to obtain a first voltage value and a second voltage value in response to a first closing instruction for the energy storage converter, where the first voltage value is a current voltage value of the first storage battery, the second voltage value is a current voltage value of the second storage battery, and the first storage battery and the second storage battery are any two storage batteries capable of forming a loop connected to the energy storage converter; and the circuit current intensity is the intensity value of the current in the circuit formed by the first storage battery and the second storage battery if the first voltage value is not equal to the second voltage value.
A processing unit 302, configured to determine whether the first voltage value is equal to the second voltage value; the method is also used for judging whether the loop current intensity is smaller than or equal to a preset first threshold value; the method is also used for sending a first closing instruction to the energy storage converter if the loop current intensity is smaller than or equal to a preset first threshold value; and sending a second closing instruction to the contactor so as to disconnect a loop formed by the first storage battery and the second storage battery.
In a possible embodiment, the processing unit 302 is configured to determine that there is no potential difference between the first battery and the second battery if the first voltage value is equal to the second voltage value; sending a first closing instruction to an energy storage converter; and sending a second closing instruction to the contactor.
In one possible implementation, the processing unit 302 is configured to compare the magnitudes of the first voltage value and the second voltage value if the first voltage value and the second voltage value are not equal; the obtaining unit 301 is configured to determine a current direction of the circulating current as from the first battery to the second battery if the first voltage value is greater than the second voltage value, and obtain a voltage difference value, where the voltage difference value is obtained by subtracting the second voltage value from the first voltage value; acquiring a loop resistance value, wherein the loop resistance value is the total resistance value in a loop formed by the first storage battery and the second storage battery; and obtaining the loop current intensity according to the voltage difference value and the loop resistance value.
In a possible implementation manner, the processing unit 302 is configured to display a prompt message to the user if the loop current intensity is greater than a preset first threshold, where the prompt message is used to prompt the user that if the energy storage converter is turned off, a circulation current that can damage the device is generated between the storage batteries; and responding to a command of forcibly closing the energy storage converter sent by a user, and sending a first closing command to the energy storage converter.
In one possible implementation, the processing unit 302 is configured to determine whether the loop current intensity is greater than a preset second threshold, where the preset second threshold is a rated open current intensity value of the contactor; if the current intensity of the loop is greater than a preset second threshold value, determining that the contactor cannot guarantee that the arc extinguishing process is finished currently, and sending a first closing instruction to the energy storage converter; and after the first preset time period passes, sending a second closing instruction to the contactor.
In one possible implementation, the processing unit 302 is configured to send the first shutdown instruction to the energy storage converter and send the second shutdown instruction to the contactor if the loop current intensity is less than or equal to a preset second threshold.
In a possible implementation manner, the processing unit 302 is configured to determine whether the user opens the contactor protection mode if the loop current intensity is less than or equal to a preset second threshold, where the contactor protection mode is a mode for reducing the contactor loss probability in a case of non-emergency shutdown; if the user opens the contactor protection mode, a first closing instruction is sent to the energy storage converter; and after a second preset time period, sending a second closing instruction to the contactor.
It should be noted that: in the device provided in the above embodiment, when implementing the functions thereof, only the division of the above functional modules is used as an example, in practical application, the above functional allocation may be implemented by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to implement all or part of the functions described above. In addition, the embodiments of the apparatus and the method provided in the foregoing embodiments belong to the same concept, and specific implementation processes of the embodiments of the method are detailed in the method embodiments, which are not repeated herein.
The application also discloses a computer readable storage medium storing a computer program for execution by a processor of a control method of an energy storage system and an energy storage converter as disclosed in the above specification.
The application also discloses electronic equipment. Referring to fig. 4, fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application. The electronic device 400 may include: at least one processor 401, at least one communication bus 402, at least one user interface 403, a network interface 404, a memory 405.
Wherein communication bus 402 is used to enable connected communications between these components.
The user interface 403 may include a Display screen (Display) and a Camera (Camera), and the optional user interface 403 may further include a standard wired interface and a standard wireless interface.
The network interface 404 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface), among others.
Wherein the processor 401 may include one or more processing cores. The processor 401 connects the various parts within the entire server using various interfaces and lines, performs various functions of the server and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 405, and invoking data stored in the memory 405. Alternatively, the processor 401 may be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), programmable logic array (Programmable Logic Array, PLA). The processor 401 may integrate one or a combination of several of a central processing unit (Central Processing Unit, CPU), an image processor (Graphics Processing Unit, GPU), a modem, etc. The CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for rendering and drawing the content required to be displayed by the display screen; the modem is used to handle wireless communications. It will be appreciated that the modem may not be integrated into the processor 401 and may be implemented by a single chip.
The Memory 405 may include a random access Memory (Random Access Memory, RAM) or a Read-Only Memory (Read-Only Memory). Optionally, the memory 405 includes a non-transitory computer readable medium (non-transitory computer-readable storage medium). Memory 405 may be used to store instructions, programs, code sets, or instruction sets. The memory 405 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing the above-described various method embodiments, etc.; the storage data area may store data or the like involved in the above respective method embodiments. The memory 405 may also optionally be at least one storage device located remotely from the aforementioned processor 401. Referring to fig. 4, an operating system, a network communication module, a user interface module, and an energy storage system control application may be included in memory 405, which is one type of computer storage medium.
In the electronic device 400 shown in fig. 4, the user interface 403 is mainly used as an interface for providing input for a user, and obtains data input by the user; and the processor 401 may be used to invoke an energy storage system control application stored in the memory 405, which when executed by the one or more processors 401, causes the electronic device 400 to perform the method as in one or more of the embodiments described above. It should be noted that, for simplicity of description, the foregoing method embodiments are all expressed as a series of action combinations, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required in the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In the several embodiments provided herein, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, such as a division of units, merely a division of logic functions, and there may be additional divisions in actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some service interface, device or unit indirect coupling or communication connection, electrical or otherwise.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a memory, including several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned memory includes: various media capable of storing program codes, such as a U disk, a mobile hard disk, a magnetic disk or an optical disk.
The above are merely exemplary embodiments of the present disclosure and are not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure.
This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a scope and spirit of the disclosure being indicated by the claims.