CN110797928A - Charging station load balance management method and device - Google Patents
Charging station load balance management method and deviceDownload PDFInfo
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- CN110797928A CN110797928ACN201810872939.5ACN201810872939ACN110797928ACN 110797928 ACN110797928 ACN 110797928ACN 201810872939 ACN201810872939 ACN 201810872939ACN 110797928 ACN110797928 ACN 110797928A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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Abstract
Description
Technical Field
The invention belongs to the technical field of electric vehicle charging, and particularly relates to a charging station load balancing management method and device.
Background
With the popularization and spread of new energy vehicles, the construction of charging facilities is very important. However, various factors such as transformer capacity and space limit the rapid development and popularization of charging facilities. Through earlier investigation, there are more than 900 charging parking stalls in a certain large-scale public transport company's parking area in China, and wherein 600 more than traditional cars need to be changed into pure electricity, nevertheless receive place transformer capacity, and the normal operation of vehicle can't be satisfied to the simple increase of the machine that charges quantity, need use charging station load balancing management system as the support, utilize the clearance of departure, the nimble dispatch is mended the electricity, satisfies the vehicle operation.
The Chinese patent application with the application publication number of CN107749629A, a charging station load real-time scheduling-based charging pile access control method, discloses a real-time scheduling charging pile access control method, the current user load is calculated by collecting the output power of the transformer side of each cell and the total power of the charging stations, the current maximum available power is calculated according to the rated power of the transformer, the maximum charging pile number is calculated according to the rated power of the charging piles, and the ordered charging of an electric vehicle and the safe operation of a distribution network are realized.
Although the above patent can realize the orderly charging of the electric automobile and the safe operation of the distribution network, the distribution mode of the rated power of the charging pile is not considered, the power battery capacities of new energy vehicles of different manufacturers and different models are different, the required charging power is different, and the constructed charging station is limited by the field size and the transformer capacity, so that the charging problem of more vehicles cannot be met to the maximum extent.
Disclosure of Invention
The invention aims to provide a charging station load balance management method and a charging station load balance management device, which are used for solving the problem that charging of more vehicles cannot be met to the maximum extent under the constraint conditions of limited transformer capacity, limited field and the like.
In order to achieve the above object, the present invention provides a charging station load balancing management method, which specifically includes the following steps:
the first method scheme is as follows: the method comprises the following steps:
1) collecting total real-time working power N of charging machine group and electric equipment and total transformer capacity N of charging stationtCalculating the residual capacity Nr of the charging station transformer as Nt-N；
2) Real-time acquisition of vehicle charging demand power NVAnd the corresponding maximum output power Ng of the charging gun;
3) judgment ofResidual capacity Nr of transformer of charging station and required power N for charging vehicleVAnd the maximum output power Ng of the charging gun, so that the load is charged in a balanced manner:
if Nr>NVAnd Ng>NVThen the required power N is charged by the vehicleVOutputting;
if Nr>NVAnd Ng<NVOutputting the power with the maximum power Ng of the charging gun;
if Nr<NVAnd Ng>Nr, outputting the residual capacity Nr of the transformer of the charging station;
if Nr<NVAnd Ng<Nr, outputting with the maximum power Ng of the charging gun;
wherein Nr, NVNg is an invariant for the variance.
The second method is that on the basis of the first method, the vehicle charging demand power N in the step 2) isVThe method is characterized in that the method is collected when a charger is started at the minimum power n and performs information interaction with a load.
In the third method, based on the second method, if Nr is less than n, the power output is prohibited.
And on the basis of the first method scheme, when a plurality of vehicles are charged simultaneously, distributing the residual capacity of the transformer of the charging station according to the proportion of the required power of the vehicles.
The invention also provides a charging station load balancing management device, which specifically comprises the following scheme:
the first device scheme comprises a controller, a memory and a program which is stored in the memory and can run on the controller, wherein the controller executes the program to realize the following steps:
1) collecting total real-time working power N of charging group and other electric equipment and collecting total transformer capacity N of charging stationtCalculating the residual capacity Nr of the charging station transformer as Nt-N；
2) Real-time acquisition of vehicle charging demand power NVAnd the corresponding maximum output power Ng of the charging gun;
3) judging the residual capacity Nr of the transformer of the charging station and the required power N for charging the vehicleVAnd the maximum output power Ng of the charging gun, so that the load is charged in a balanced manner:
if Nr>NVAnd Ng>NVThen the required power N is charged by the vehicleVOutputting;
if Nr>NVAnd Ng<NVOutputting the power with the maximum power Ng of the charging gun;
if Nr<NVAnd Ng>Nr, outputting the residual capacity Nr of the transformer of the charging station;
if Nr<NVAnd Ng<Nr, outputting with the maximum power Ng of the charging gun;
wherein Nr, NVNg is an invariant for the variance.
The second device scheme is that on the basis of the first device scheme, the vehicle charging required power N in the step 2) isVThe method is characterized in that the method is collected when a charger is started at the minimum power n and performs information interaction with a load.
In the third device configuration, based on the second device configuration, if Nr is less than n, the power output is prohibited.
And on the basis of the first device scheme, when a plurality of vehicles are charged simultaneously, distributing the residual capacity of the transformer of the charging station according to the proportion of the required power of the vehicles.
The invention has the beneficial effects that: according to the invention, the supplied capacity of the transformer is acquired in real time, and meanwhile, the maximum output power of the charging gun, the residual capacity of the transformer of the charging station and the required charging power of the vehicle are compared in real time according to the required charging power proportion of the vehicle during charging, so that the charging requirement of the vehicle can be met to the maximum extent under limited conditions.
Drawings
FIG. 1 is a topology diagram of a load balancing management system of the present invention;
fig. 2 is a flowchart of the charging station load balancing management method when a single vehicle starts charging according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a load balancing distribution curve according to the present invention.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a topological diagram of a load balancing management system, which includes a charging station transformer, a charging station load balancing management system, a load acquisition terminal, a charging group a, a charging group B, a charging group C, and a power consumption device. The charging station comprises a charging station transformer, a charging station; the load acquisition terminal is arranged on a charging station transformer bus and acquires voltage and current on the transformer bus in real time; the load acquisition terminal uploads acquired data to the charging station load balancing management system through a wired or wireless network, and the charging station load balancing management system is used for controlling a charging machine group connected with the charging station load balancing management system.
The charger groups B and C in the embodiment comprise chargers numbered 0x01, 0x02 and 0x 03; of course, the number of chargers can be set according to actual charging equipment. The charger corresponds to a plurality of charging guns, and the charging guns are used as output power ends for charging vehicles.
The charging station load balancing management system in this embodiment may be an industrial personal computer or a CPU, and the like, and can implement an intelligent regulation function of the output power of the charger or the charger group. The industrial personal computer mainly comprises a load acquisition module, a CAN communication module and a load balancing controller, wherein the load acquisition module is responsible for acquiring bus voltage and current; the CAN communication module is responsible for receiving and transmitting relevant data of the charger or the charger group; and the load balancing controller is responsible for calculating the residual capacity Nr of the transformer of the charging station and controlling the output power of the charger or the charger group.
The specific working process of the load balancing management system comprises the following steps: the load acquisition terminal acquires the voltage and current of a supplied bus of the transformer in real time, uploads the data to the charging station load balancing management system through a wireless or wired network, and the load balancing management system calculates the residual capacity of the transformer of the charging station according to the maximum capacity of the transformer and the acquired and reported supplied capacity and allocates the output power of the charger in real time according to the power requested by the vehicle.
Taking a single vehicle for gun insertion to start charging as an example, as shown in fig. 2, in the charging station load balancing management method, the load acquisition terminal, the charging station load balancing management system and the charger are coordinated and matched with each other, so that the intelligent balance between the output power of the charger and the residual capacity of the transformer of the charging station is realized, and the charging requirements of different vehicles are met to the maximum extent.
The specific implementation steps are as follows:
1) the load acquisition terminal acquires voltage and current on a bus of the transformer in real time, calculates the total power N supplied by the transformer of the charging station according to a formula P which is U multiplied by I, namely the total real-time working power of the charging machine group and the electric equipment, and uploads the power N supplied by the transformer of the charging station to the load balance management system of the charging station in real time through a wired or wireless network.
2) The charging station load balance management system records the total capacity N of the charging station transformer according to the information recorded in advancetCalculating the residual capacity Nr of the transformer of the charging station as Nt-N；
3) When a vehicle is plugged in a gun to start charging, the charger is started at the minimum power N (such as 1kW) and performs information interaction with a vehicle battery management system to obtain the required power N for charging the vehicleV；
4) The charger charges the vehicle with the required power NVThe maximum output power Ng of the charging gun is uploaded to a charging station load balance management system in real time through a wired or wireless network;
5) the charging station load balance management system compares the residual capacity Nr of the charging station transformer and the required vehicle charging power N in real timeVAnd the maximum output power Ng of the charging gun:
if the residual capacity Nr of the transformer of the charging station is larger than the required power N for charging the vehicleVAnd the maximum output power Ng of the charging gun is larger than the charging demand power N of the vehicleVIf the charging gun is allowed to charge the vehicle, the load balance management system sends a command to allow the charging gun to supply the required power N for charging the vehicleVOutput ";
if the residual capacity Nr of the transformer of the charging station is larger than the required power N for charging the vehicleVAnd the maximum output power Ng of the charging gun is less than the required power N of the vehicle chargingVIf yes, the load balancing management system issues an instruction of allowing the output with the maximum power Ng of the charging gun;
if the residual capacity Nr of the transformer of the charging station is less than the required power N for charging the vehicleVAnd the maximum output power Ng of the charging gun is greater than the required power Nr of the vehicle charging, the load balancing management system issues an instruction of allowing the charging gun to output with the residual capacity Nr of the charging station transformer;
if the residual capacity Nr of the transformer of the charging station is less than the required power N for charging the vehicleVAnd the maximum output power Ng of the charging gun is less than the required power Nr of the vehicle charging, the load balancing management system issues an instruction of allowing the output with the maximum output power Ng of the charging gun;
and if the residual capacity Nr of the transformer of the charging station is less than the minimum starting power n of the charger, the load balancing management system issues an instruction of 'forbidding the output of the charging gun'.
The remaining capacity Nr of the charging station transformer in this embodiment is changed according to the change of the total power N of the charging station transformer for real-time operation, and is a change amount; vehicle charging demand power NVIs determined according to the actual condition of the vehicle, which is the variation; the maximum output power Ng of the charging gun is a fixed value and is an invariant.
Total capacity N of the charging station transformer of the present embodimenttRefers to the conventional value of apparent power under primary tap. The capacity specified on the name plate of the transformer is the rated capacity, which means that the tap changer is located in the main connection and is the product of the rated no-load voltage, the rated current and the corresponding phase coefficient. In a three-phase transformer, the rated capacity is equal to 3 × rated phase voltage × phase current, and is generally expressed by kVA or MVA.
The load of the present embodiment refers to an electronic component connected across a power supply in a circuit. The circuit should not have a load but directly connect the two poles of the power supply, and this connection is called a short circuit. The device that converts electrical energy to another form of energy is called a load. Common loads are resistors, power consuming components such as engines and light bulbs. Of course, the load in the present invention refers only to the power storage battery of the vehicle.
The real-time total working power N collected in this embodiment is the power occupied by the charging group a, the charging group B, the charging group C, and the electric equipment. This is because there may be non-charger equipment in the charging station, the power required of which is also a fraction of the transformer capacity, taking this into account, avoiding the problem of overshoot.
The distribution strategy when a single vehicle starts charging is the lowest strategy, does not conflict with the distribution power of a plurality of charger groups and the distribution power of a plurality of vehicles during simultaneous charging, and is also applicable.
In another embodiment, when the total power of a certain charger group changes, the charging station load balancing management system distributes the remaining capacity of the charging station transformer according to the total power proportion of each charger group. For example, when the residual capacity of a transformer of the charging station is 300kW, the total power required by the charger group a is 200kW, the total power required by the charger group B is 200kW, and the total power required by the charger group C is 200kW, the charging station load balancing management system allocates 100kW to each charger group according to a 1:1:1 ratio relationship; when the total power required by the chargers A is changed to 100kW, the charging station load balancing management system distributes 60kW to the chargers A, 120kW to the chargers B and 120kW to the chargers C according to the proportion relation of 1:2: 2.
In another embodiment, when a plurality of vehicles in the same charging group are plugged in the gun to start charging at the same time, the charging station load balancing management system distributes the residual capacity of the transformer of the charging station according to the proportion of the required power of the vehicles. For example, when the power required by the vehicle A is 100kW, the power required by the vehicle B is 50kW, the power of the electric equipment is 80kW, and the residual capacity of the transformer of the charging station is 120kW, the output power of the charging gun A is 80kW, and the output power of the charging gun B is 40 kW. Under the condition that the residual capacity of a transformer of the charging station, the required power of the vehicle A and the required power of the vehicle B are changed, the output power of the charging gun A and the output power of the charging gun B are changed; as shown in fig. 3.
In the invention, if a certain charger group or a certain trolley needs to meet the charging priority, the residual capacity of the transformer of the charging station firstly subtracts the total power of the requirements met by the priority, and other residual capacities are allocated to other charger groups or other vehicles according to the proportion.
The invention is characterized in that the residual capacity Nr of the transformer of the charging station and the required power N for charging the vehicleVFor the variation, the charge is maintainedIn the process of balancing the transformer capacity of the power station and the output power of the charger, the output power of different chargers/charging guns needs to be allocated in real time, so that the charging requirements of different vehicles are met to the maximum extent, and the utilization rate of the charging station is improved.
The technical scheme of the invention is that according to the distribution mode of the rated power of the charging station, the problems that new energy vehicles of different manufacturers and different models have different power battery capacities and different required charging powers and the constructed charging station is limited by the field size and the transformer capacity are considered, so that the vehicle charging requirement is met to the maximum extent, and the utilization efficiency of the charging station and the output efficiency of a charger are improved.
The invention also provides an embodiment of the charging station load balancing management device, which comprises a processor, a memory and a program stored in the memory and capable of running on the controller, wherein the processor executes the program stored in the memory to realize the following steps:
1) collecting total real-time working power N of charging machine group and electric equipment and collecting total transformer capacity N of charging stationtCalculating the residual capacity Nr of the charging station transformer as Nt-N；
2) Acquiring vehicle charging demand power N in real timeVAnd the corresponding maximum output power Ng of the charging gun;
3) judging the residual capacity Nr of the transformer of the charging station and the required power N for charging the vehicleVAnd the maximum output power Ng of the charging gun, so that the load is charged in a balanced manner:
if Nr > NVAnd Ng > NVThen the required power N is charged by the vehicleVOutputting;
if Nr > NVAnd Ng<NVOutputting the power with the maximum power Ng of the charging gun;
if Nr<NVAnd Ng is more than Nr, the residual capacity Nr of the transformer of the charging station is used for outputting;
if Nr<NVAnd Ng<Nr, outputting with the maximum power Ng of the charging gun;
wherein Nr, NVNg is an invariant for the variance.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention is to provide the above basic solution, and those skilled in the art can make changes, modifications, substitutions and variations to the embodiments without departing from the principle and spirit of the present invention.
Claims (8)
1. A charging station load balancing management method is characterized by comprising the following steps:
1) collecting total real-time working power N of charging machine group and electric equipment and total transformer capacity N of charging stationtCalculating the residual capacity Nr of the charging station transformer as Nt-N；
2) Real-time acquisition of vehicle charging demand power NVAnd the corresponding maximum output power Ng of the charging gun;
3) judging the residual capacity Nr of the transformer of the charging station and the required power N for charging the vehicleVAnd the maximum output power Ng of the charging gun, so that the load is charged in a balanced manner:
if Nr>NVAnd Ng>NVThen the required power N is charged by the vehicleVOutputting;
if Nr>NVAnd Ng<NVOutputting the power with the maximum power Ng of the charging gun;
if Nr<NVAnd Ng>Nr, outputting the residual capacity Nr of the transformer of the charging station;
if Nr<NVAnd Ng<Nr, outputting with the maximum power Ng of the charging gun;
wherein Nr, NVNg is an invariant for the variance.
2. The charging station load balancing management method according to claim 1, wherein the vehicle charging demand power N in step 2)VThe method is characterized in that the method is collected when a charger is started at the minimum power n and performs information interaction with a load.
3. The charging station load balancing management method according to claim 2, wherein if Nr < n, power output is prohibited.
4. The charging station load balancing management method according to claim 1, wherein when a plurality of vehicles are charged simultaneously, the remaining capacity of the charging station transformer is distributed in proportion to the power required by the vehicles.
5. A charging station load balancing management device, comprising a processor, a memory, and a program stored in the memory and executable on the processor, wherein the processor executes the program to perform the steps of:
1) collecting total real-time working power N of charging machine group and electric equipment and total transformer capacity N of charging stationtCalculating the residual capacity Nr of the charging station transformer as Nt-N；
2) Real-time acquisition of vehicle charging demand power NVAnd the corresponding maximum output power Ng of the charging gun;
3) judging the residual capacity Nr of the transformer of the charging station and the required power N for charging the vehicleVAnd the maximum output power Ng of the charging gun, so that the load is charged in a balanced manner:
if Nr>NVAnd Ng>NVThen the required power N is charged by the vehicleVOutputting;
if Nr>NVAnd Ng<NVOutputting the power with the maximum power Ng of the charging gun;
if Nr<NVAnd Ng>Nr, outputting the residual capacity Nr of the transformer of the charging station;
if Nr<NVAnd Ng<Nr, outputting with the maximum power Ng of the charging gun;
wherein Nr, NVNg is an invariant for the variance.
6. The charging station load balancing management device according to claim 5, wherein the vehicle charging demand power N in step 2)VThe method is characterized in that the method is collected when a charger is started at the minimum power n and performs information interaction with a load.
7. The charging station load balancing management device of claim 6, wherein power output is prohibited if Nr < n.
8. The charging station load balancing management device according to claim 5, wherein when a plurality of vehicles are charged simultaneously, the remaining capacity of the charging station transformer is distributed in proportion to the power required by the vehicles.
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| CN118144610A (en)* | 2024-03-05 | 2024-06-07 | 通号（长沙）轨道交通控制技术有限公司 | Charging station, self-adaptive charging method thereof and charging pile |
| CN118082594A (en)* | 2024-04-28 | 2024-05-28 | 厦门银河龙芯科技有限公司 | A load balancing adjustment algorithm for electric vehicle charging piles based on dynamic approach method |
| CN118082594B (en)* | 2024-04-28 | 2024-08-06 | 厦门银河龙芯科技有限公司 | Electric automobile charging pile load balancing adjustment algorithm based on dynamic approach method |
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