Disclosure of Invention
The utility model aims at providing an intelligent control cabinet can improve energy storage container inner space utilization, practices thrift cost and occupation space of line between the box, avoids external environment to interfere effectively, improves system information interaction speed, reduces controller quantity, improves the stability of product.
According to the first embodiment of the disclosure, an intelligent control cabinet applied to an energy storage system is provided, and the intelligent control cabinet comprises a cabinet body, a power distribution loop, a control loop and a communication loop, wherein the power distribution loop is located in the cabinet body and connected with a mains supply grid, alternating current of the mains supply grid is converted into direct current for supplying power to internal devices and external loads of the intelligent control cabinet, high-voltage direct current output by a direct current switch cabinet of the energy storage system is converted into direct current for supplying power to the internal devices and the external loads of the intelligent control cabinet, the power distribution loop is further used for protecting a far-end circuit, the internal devices and the external loads of the intelligent control cabinet, the control loop is used for acquiring various switching value state information in the intelligent control cabinet, controlling on-off of the internal devices and the external load power supply loop based on the switching value state information, and the communication loop is used for carrying out data exchange with a data acquisition and monitoring control system outside the intelligent control cabinet.
The power distribution circuit comprises an AC/DC switch power supply, a DC/DC switch power supply, an uninterruptible power supply and a standby battery, wherein the AC/DC switch power supply converts alternating current of a commercial power grid into direct current and then provides the direct current to the uninterruptible power supply, the DC/DC switch power supply converts high-voltage direct current output by the direct current switch cabinet into low-voltage direct current and then provides the low-voltage direct current to the uninterruptible power supply, the uninterruptible power supply charges the standby battery under the condition that the commercial power grid normally supplies power, the standby battery supplies power to internal devices and external loads of the intelligent control cabinet through the uninterruptible power supply under the condition that the commercial power grid loses power, and the power distribution circuit is further used for directly providing alternating current of the commercial power grid to alternating current high-power loads outside the intelligent control cabinet.
Optionally, the power distribution loop comprises a first lightning protection device, a breaker and a fuse, wherein the first lightning protection device is used for protecting lightning surge risks of the far-end line, the breaker is arranged in the power distribution loop and used for overload protection, and the fuse is used for short-circuit protection of devices in the power distribution loop.
The intelligent control cabinet comprises an intelligent control cabinet, a control circuit and a control circuit, wherein the intelligent control cabinet is characterized in that the control circuit comprises a main controller, the main controller is used for receiving information sent by a lower energy storage unit controller outside the intelligent control cabinet and instructions issued by an energy management system outside the intelligent control cabinet, controlling the on-off of a main circuit of the energy storage system outside the intelligent control cabinet based on the information sent by the lower energy storage unit controller and the instructions issued by the energy management system, and the main controller is also used for acquiring various switching value state information inside the intelligent control cabinet and controlling the on-off of internal devices and an external load power supply circuit based on the switching value state information.
Optionally, the main controller is further configured to control the power distribution loop relay to be disconnected and/or adjust an output refrigeration capacity of a cooling system in the energy storage system through a communication instruction based on collected information of various sensors disposed inside the energy storage system, where the cooling system is located outside the intelligent control cabinet.
Optionally, the communication loop comprises a monitoring upper computer and an exchanger, wherein the monitoring upper computer is used for tidying and archiving the real-time operation data and the state information of the energy storage system and/or transmitting the real-time operation data and the state information to the data acquisition and monitoring control system through the exchanger.
Optionally, the communication loop further comprises a metering device, wherein the metering device is used for monitoring the state of a main loop of the energy storage system outside the intelligent control cabinet, and the main controller in the control loop is used for comparing the operation condition information of the main loop with the battery information acquired from the battery management system under the condition that the time of the main loop in the shutdown condition exceeds the preset time, and sending a command for cutting off the redundant load in the power supply loop after confirming that the main loop is in the shutdown condition based on the comparison information.
Optionally, the main controller is further configured to receive SOC information of a backup battery in the power distribution circuit and SOC information of a battery module used for storing energy in the energy storage system, and if the SOC value of the backup battery is lower than a preset backup battery SOC value and the SOC value of the battery module is greater than the preset battery module SOC value, the main controller is further configured to determine whether the energy storage system is in an operating state, and if the energy storage system is in the operating state, control a DC/DC switching power supply in the power distribution circuit to obtain direct current from the DC switching cabinet to supply power to an uninterruptible power supply in the power distribution circuit, and if the energy storage system is in the standby state, control a main circuit of the energy storage system to be closed to supply power to the energy storage system.
Optionally, the main controller is further configured to obtain battery cell feature information, adjust a refrigeration temperature value according to a control policy based on the battery cell feature information, and send the refrigeration temperature value to a cooling system outside the intelligent control cabinet.
Optionally, an interface is provided on the cabinet body, and the power distribution circuit, the control circuit and the communication circuit are connected with the outside through the interface.
By adopting the technical scheme, as the power distribution loop, the control loop and the communication loop are positioned in the same cabinet body, namely, the multiple functions of the internal criticality of the energy storage system are integrated into the same cabinet body, the energy storage system has compact structural layout and tight electric fit, improves the utilization rate of the internal space of the energy storage container, saves the cost and occupied space of connecting wires between the boxes, strengthens the cooperative cooperation among all the components, can realize the requirements of higher standards, such as high protection level, high salt spray corrosion resistance, high electromagnetic interference resistance, wide working temperature and humidity range and the like, and also effectively improves the application environment of the control part of the energy storage system, shortens the communication distance of each loop, improves the communication quality, reduces the information transmission delay, improves the information interaction speed of the system, reduces the number of controllers and improves the communication control reliability of the energy storage system and the stability of products.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Fig. 2 is a schematic topology diagram of an intelligent control cabinet for use with an energy storage system according to one embodiment of the present disclosure. As shown in fig. 2, the intelligent control cabinet includes a cabinet body, and a power distribution circuit 10, a control circuit 20 and a communication circuit 30 which are positioned in the cabinet body.
The power distribution circuit 10 is connected with a commercial power grid, converts alternating current of the commercial power grid into direct current for supplying power to internal devices and external loads of the intelligent control cabinet, converts high-voltage direct current output by a direct current switch cabinet of the energy storage system into direct current for supplying power to the internal devices and the external loads of the intelligent control cabinet, and is also used for protecting a far-end circuit to avoid lightning surge risks and protecting the internal devices and the external loads of the intelligent control cabinet to ensure stable operation of the far-end circuit.
The control loop 20 is used for acquiring various switching value state information in the intelligent control cabinet and controlling on-off of internal devices of the intelligent control cabinet and an external load power supply loop based on the switching value state information;
the communication loop 30 is used for data exchange with the SCADA outside the intelligent control cabinet.
By adopting the technical scheme, as the power distribution circuit 10, the control circuit 20 and the communication circuit 30 are positioned in the same cabinet body, namely, the multiple functions of the internal criticality of the energy storage system are integrated into the same cabinet body, the structure layout is compact, the electric cooperation is tight, the internal space utilization rate of the energy storage container is improved, the cost and the occupied space of connecting wires between the boxes are saved, the cooperative cooperation among all the components is enhanced, the requirements of higher standards such as high protection level, high salt spray corrosion resistance, high electromagnetic interference resistance, wide working temperature and humidity range and the like can be realized, the application environment of the control part of the energy storage system is effectively improved, the communication distance of each circuit is shortened, the communication quality is improved, the information transmission delay is reduced, the system information interaction speed is improved, the number of controllers is reduced, and the reliability of the communication control of the energy storage system and the stability of products are improved.
Fig. 3 is a schematic circuit diagram of an intelligent control cabinet according to one embodiment of the present disclosure.
As shown in fig. 3, the power distribution circuit 10 mainly comprises an ac/dc power supply and a protection device. As shown in fig. 3, the power distribution circuit 10 may include an AC/DC switching power supply 101, a DC/DC switching power supply 102, an uninterruptible power supply (Uninterruptible Power Supply, UPS) 103, and a backup battery 104. The power distribution circuit 10 may also include a first lightning protection device 105, a circuit breaker, and a fuse.
The power distribution circuit 10 is connected to a utility power grid, and converts the power supply voltage into a control device power supply voltage through the AC/DC switching power supply 101 to supply power for the internal devices and the external loads of the intelligent control cabinet, that is, the AC/DC switching power supply 101 converts alternating current of the utility power grid into direct current power and then supplies the direct current power to the uninterruptible power supply 103, so that the uninterruptible power supply 103 can supply power for the internal devices and the external loads of the intelligent control cabinet.
The DC/DC switching power supply 102 takes power from a DC switch cabinet of the energy storage system, converts high-voltage direct current output by the DC switch cabinet into low-voltage direct current, and provides the low-voltage direct current to the uninterruptible power supply 103, so that the DC/DC switching power supply can be self-powered directly through a DC circuit.
With further reference to fig. 3, the utility ac grid supplies power to various loads of the energy storage system via the circuit breaker MCB1, and may be divided into a plurality of power supply branches according to different power supply voltage requirements. For example, the AC mains voltage is supplied to the AC/DC switching power supply 101 via the circuit breaker MCB2, converted to a DC low voltage (e.g., 24 Vdc) by the AC/DC switching power supply 101, and then connected to the UPS 103. The UPS 103 charges the standby battery 104 when the utility grid is normally powered, and the standby battery 104 supplies power to the main controller 201 and external auxiliary devices (e.g., fire protection system, lighting lamp) through the UPS 103 when the utility grid is powered off. Meanwhile, in the direct current switch cabinet of the energy storage system, one high-voltage power supply (for example, 1500 Vdc) is led out, is connected to the UPS 103 after being reduced by the DC/DC switch power supply 102, can be used as a second power supply, and supplies power to the energy storage system when the commercial power alternating current power grid loses power. The utility grid may also directly supply an ac high-power load (e.g., 480 Vac), such as a cooling system, via the circuit breaker MCB 3.
In addition, when the utility power grid is powered down for a long time, an I/O command signal can be remotely issued to the UPS 103 through the EMS, and the UPS 103 is started to establish a low direct current voltage (for example, 24 Vdc) through the standby battery 104, so as to supply power to the energy storage system control device and support the energy storage system to continuously run.
With continued reference to fig. 3, circuit breakers are provided in each of the power distribution circuits to manually close and open the power distribution circuits as switching devices, and may also function as overload protection. In addition, the devices within the power distribution circuit 10 may also be equipped with fuses (e.g., FU1, FU 2) for short-circuit protection.
As shown in fig. 3, the auxiliary power input port of the intelligent control cabinet is connected to the first lightning protection device 105 through the MCB4, so as to protect the exposed far-end line from lightning surge. In addition, an ethernet communication lightning protection device, such as a second lightning protection device 106 and a third lightning protection device 107, is disposed at the external interface of the control loop, so as to ensure that the energy storage system meets the EMC electromagnetic interference index.
It should be understood by those skilled in the art that the circuit breakers, fuses, lightning protection devices and control relays shown in fig. 3 are not specified in number, and the distribution circuit is not completely drawn in the figure, and the number of switches can be increased or decreased according to the actual application requirements.
With continued reference to FIG. 3, the control loop 20 includes a main controller 201 for performing various control functions.
In some embodiments, the main controller 201 is configured to receive information sent by a lower energy storage unit controller outside the intelligent control cabinet and an instruction sent by an energy management system outside the intelligent control cabinet, and control on-off of a main loop of the energy storage system outside the intelligent control cabinet based on the information sent by the lower energy storage unit controller and the instruction sent by the energy management system. For example, the Battery module includes a BMU collector inside for collecting voltage and temperature information of the Battery cells, and the voltage and temperature information are uploaded to a BECU controller in a Battery management system (Battery MANAGEMENT SYSTEM, BMS) control box through a CAN communication bus, and the Battery cell state information is sorted and summarized by BECU and then uploaded to the main controller 201. The main controller 201 can receive the information of multiple BECU controllers at the same time, and collate and send the information to the monitoring upper computer 301 for storage and uploading. The main controller 201 is also in charge of receiving the control command of the EMS station, for example, when the EMS issues a start command, the main controller 201 can combine the state information of the battery cell to determine whether the energy storage system meets the start condition, and when the condition is met, the main loop direct current switch cabinet and other isolation devices can be closed according to the logic sequence to switch on the main loop.
In some embodiments, the master controller 201 may obtain status information for each switch and communicate back to the EMS, thereby forming a closed-loop control chain.
In some embodiments, the main controller 201 may also be configured to obtain various switch value state information inside the intelligent control cabinet, for example, a fuse state, a detector state, a cabinet door state, an emergency stop button, and the like, and control on and off of an internal device of the intelligent control cabinet and an external load power supply circuit based on the switch value state information, so as to control power supply of the intelligent control cabinet.
In some embodiments, the main controller 201 may also be configured to control the disconnection of the relay in the power distribution loop and/or adjust the output cooling capacity of the cooling system in the energy storage system according to the communication command based on the collected information of various sensors disposed inside the energy storage system, where the cooling system is located outside the intelligent control cabinet, so that the low power consumption mode can be realized.
With continued reference to fig. 3, the communication loop 30 includes a supervisory host computer 301 and a switch 302. The monitoring upper computer 301 may be a microcomputer of an X86 platform or an ARM platform, and may freely design an application program in cooperation with database software, and may sort and archive real-time operation data and status information of the energy storage system, and may locally archive according to a predetermined rule or transmit the data to the cloud monitoring platform through ethernet, for example, transmit the data to the SCADA through the switch 302. The customer SCADA monitoring platform can be directly connected with the monitoring upper computer 301 to display the state of the energy storage system, and can realize remote management and scheduling control. When the energy storage system is far away from the EMS, optical fiber communication can be adopted, so that the stability of control signal transmission is ensured.
As shown in fig. 3, the communication circuit 30 further includes a metering device 303, which is configured to monitor a state of a main circuit of the energy storage system outside the intelligent control cabinet, for example, to monitor whether the main circuit is running, to collect environmental temperature and humidity information, and to meter accumulated electric quantities of the main circuit and the power distribution circuit.
In some embodiments, the main controller 201 is configured to compare the operation condition information of the main circuit with the battery information collected from the battery management system when the duration of the main circuit in the shutdown condition exceeds the preset duration, and send a command for cutting off the redundant load in the power supply circuit after confirming that the main circuit is in the shutdown condition (i.e. the main circuit has no output current) based on the comparison information, for example, a control command is issued to cut off the air conditioner and the BMS power supply circuit, so as to reduce the energy loss of the energy storage system. Of course, if the devices need to be started, the main controller 201 may directly and remotely issue a start command, so that the energy storage system will automatically switch to a normal state, restore the power supply of the air conditioner and the BMS, and execute the start command.
In some embodiments, the main controller 201 may also be configured to receive SOC information of the backup battery 104 and SOC information of a battery module used for energy storage in the energy storage system. If the SOC value of the backup battery 104 is lower than the preset backup battery SOC value and the SOC value of the battery module is greater than the preset battery module SOC value, which means that the SOC of the backup battery is in a lower state and needs to be charged, and the SOC of the battery module for storing energy is not in a lower state and can supply power to the outside, then in this case, the main controller 201 determines whether the energy storage system is in an operating state, if the energy storage system is in an operating state, the main controller 201 controls the DC/DC switch power supply 102 to obtain direct current from the DC switch cabinet to supply power to the uninterruptible power supply 103, wherein the DC switch cabinet is connected with the battery module for storing energy to take power from the battery module. Of course, the power supply circuit of the energy storage system can be cut off when the electric quantity of the UPS is low. Through adopting above-mentioned technical scheme, can enough realize battery cell's charging when the SOC of battery cell in the intelligent control cabinet is in lower state, can protect the battery module that is used for energy storage in the energy storage system again, avoid this battery module to supply power outward under the condition that the SOC value is too low.
In some embodiments, the main controller 201 may also be configured to obtain the battery cell characteristic information, adjust the cooling temperature value according to the control policy based on the battery cell characteristic information, and send the cooling temperature value to a cooling system outside the intelligent control cabinet. In this way, the temperature of the cooling system can be adjusted, so that the output temperature of the cooling system changes along with the change of the operation condition of the energy storage system.
FIG. 4 is a schematic diagram of an I/O interface of an intelligent control cabinet in accordance with one embodiment of the present disclosure. That is, an interface is provided on the cabinet body, and the power distribution circuit 10, the control circuit 20, and the communication circuit 30 are connected to the outside through the interface. As shown in fig. 4, the intelligent control cabinet includes a mains supply input port applied to the distribution loop 10 for supplying power to the AC/DC switching power supply 101, an AC load distribution interface for directly supplying power to the AC high-power load, a DC power taking port for obtaining high-voltage DC power from the DC/DC switching power supply 102, a DC load distribution port for providing low-voltage DC power to the load, a metering meter sampling port for collecting a main loop status signal by the metering meter 303, an optical fiber communication port and an ethernet communication port for communicating with the EMS, and an RS485 communication interface and a CAN communication interface for communicating with the BMS or the like. Those skilled in the art will appreciate that the functionality of these interfaces may be defined according to customer requirements to enable hardware coordinated interactions with the site EMS controller. For example, if a single energy storage system fails in insulation, a hardware scram signal can be used to link multiple energy storage systems to stop simultaneously. In addition, the number of the interfaces CAN be adjusted according to the application requirements of different energy storage systems, and interfaces such as switching value control, auxiliary power distribution, CAN communication buses and the like CAN be reserved for the energy storage systems, so that convenience is provided for maintenance and upgrading of the energy storage systems.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.