Control method and system of energy storage type charging system

Abstract

The invention provides a control method and system of an energy storage type charging system, and the control method of the energy storage type charging system comprises the following steps: constructing the energy storage charging system of a 240-1500kW power band by using an AC / DC charging module and a DC / DC charging module; an EMS management unit is used for controlling the output power of the AC / DC charging module and the output power of the DC / DC charging module; and distributing the actual output power by using a power distribution unit. According to the technical scheme, the advantages of alternating-current stacked storage and direct-current stacked storage are integrated, the AC / DC charging module and the DC / DC charging module are integrated in one system, the long-term operation reliability advantage of the AC / DC charging module can be exerted, the high-efficiency advantage that an energy storage battery directly charges a vehicle through the DC / DC charging module can also be exerted, and the charging efficiency of the vehicle is improved. The comprehensive cost is lowest, the efficiency is higher, and the system reliability is higher.

Description

Background Art

[0002] With the gradual popularization of new energy vehicles, the AC power grid cannot provide enough electricity in many scenarios. In this case, a supporting energy storage system to supplement the insufficient AC power supply capacity is a good solution. At present, there are two ways to stack energy storage on charging piles on the market. One is AC stacking storage, where the energy storage battery converts the battery stored energy into AC power to power the charging pile through PCS; the other is DC stacking storage, where the energy storage battery directly charges the car through DC / DC; these two methods have their own advantages and disadvantages. AC stacking storage technology is mature but the energy conversion efficiency is low; DC stacking storage has high energy conversion efficiency, but the related accessories are not mature and the cost is high. Summary of the invention

[0003] The present application provides a control method and system for an energy storage charging system, which are used to improve the efficiency of the energy storage system and reduce the cost.

[0004] In a first aspect, a control method for an energy storage charging system is provided, comprising the following steps:

[0005] Using AC / DC charging modules and DC / DC charging modules, a storage charging system with a power range of 240kW to 1500kW is constructed;

[0006] Using the EMS management unit, the output power of the AC / DC charging module and the DC / DC charging module is controlled;

[0007] The actual output power is distributed using a power distribution unit, including:

[0008] Evaluate and allocate the priority of charging equipment to obtain the equipment priority;

[0009] Monitor the power module to obtain the status and energy efficiency information of the power module;

[0010] Based on the device priority and the status and energy efficiency information of the power module, weighting the power module is assigned to obtain a weight score of the power module;

[0011] The output power is allocated based on the weight scores of the power modules.

[0012] In the above technical scheme, an energy storage charging system with a power range of 240kW to 1500kW is constructed by using an AC / DC charging module and a DC / DC charging module; the output power of the AC / DC charging module and the DC / DC charging module is controlled by using an EMS management unit; the actual output power is distributed by using a power distribution unit; the advantages of AC stacked storage and DC stacked storage are combined, and the AC / DC charging module and the DC / DC charging module are integrated into one system, which can give play to the long-term operation reliability advantage of the AC / DC charging module and the high efficiency advantage of the energy storage battery directly charging the vehicle through the DC / DC charging module, with the lowest overall cost, higher efficiency and higher system reliability.

[0013] In a specific implementation scheme, a strategy of preferentially using the AC / DC charging module for charging is adopted to control the optimal working state.

[0014] In a specific implementation scheme, a switch circuit is provided for each of the AC / DC charging modules and the DC / DC charging modules to control the working state.

[0015] In a specific implementation scheme, the step of allocating the actual output power using the power allocation unit further includes:

[0016] The equipment requirements and the state changes of the power modules are monitored in real time, and the power allocation is adjusted dynamically.

[0017] In a second aspect, a control system of an energy storage charging system is provided, comprising:

[0018] AC / DC charging module and DC / DC charging module are used to build energy storage charging systems with a power range of 240kW to 1500kW;

[0019] An EMS management unit, used to manage and control the output power of the AC / DC charging module and the DC / DC charging module;

[0020] The power distribution unit is used to distribute the actual output power; it includes:

[0021] Evaluate and allocate the priority of charging equipment to obtain the equipment priority;

[0022] Monitor the power module to obtain the status and energy efficiency information of the power module;

[0023] Based on the device priority and the status and energy efficiency information of the power module, weighting the power module is assigned to obtain a weight score of the power module;

[0024] The output power is allocated based on the weight scores of the power modules.

[0025] In the above technical scheme, an energy storage charging system with a power range of 240kW to 1500kW is constructed by using an AC / DC charging module and a DC / DC charging module; the output power of the AC / DC charging module and the DC / DC charging module is controlled by using an EMS management unit; the actual output power is distributed by using a power distribution unit; the advantages of AC stacked storage and DC stacked storage are combined, and the AC / DC charging module and the DC / DC charging module are integrated into one system, which can give play to the long-term operation reliability advantage of the AC / DC charging module and the high efficiency advantage of the energy storage battery directly charging the vehicle through the DC / DC charging module, with the lowest overall cost, higher efficiency and higher system reliability.

[0026] In a specific implementation scheme, a strategy of preferentially using the AC / DC charging module for charging is adopted to control the optimal working state.

[0027] In a specific implementation scheme, a switch circuit is provided for each of the AC / DC charging modules and the DC / DC charging modules to control the working state.

[0028] In a specific implementation scheme, the power distribution unit distributes the actual output power and further includes:

[0029] The equipment requirements and the state changes of the power modules are monitored in real time, and the power allocation is adjusted dynamically.

[0030] In a third aspect, an electronic device is provided, comprising a processor, wherein the processor is coupled to a memory, wherein at least one computer program is stored in the memory, and the at least one computer program is loaded and executed by the processor so that the electronic device implements any one of the control methods for the energy storage charging system.

[0031] In the above technical scheme, an energy storage charging system with a power range of 240kW to 1500kW is constructed by using an AC / DC charging module and a DC / DC charging module; the output power of the AC / DC charging module and the DC / DC charging module is controlled by using an EMS management unit; the actual output power is distributed by using a power distribution unit; the advantages of AC stacked storage and DC stacked storage are combined, and the AC / DC charging module and the DC / DC charging module are integrated into one system, which can give play to the long-term operation reliability advantage of the AC / DC charging module and the high efficiency advantage of the energy storage battery directly charging the vehicle through the DC / DC charging module, with the lowest overall cost, higher efficiency and higher system reliability.

[0032] In a fourth aspect, a computer-readable storage medium is provided, wherein at least one computer program is stored in the computer-readable storage medium, and the at least one computer program is loaded and executed by a processor so that the computer-readable storage medium implements any one of the control methods of the energy storage charging system.

[0033] In the above technical scheme, an energy storage charging system with a power range of 240kW to 1500kW is constructed by using an AC / DC charging module and a DC / DC charging module; the output power of the AC / DC charging module and the DC / DC charging module is controlled by using an EMS management unit; the actual output power is distributed by using a power distribution unit; the advantages of AC stacked storage and DC stacked storage are combined, and the AC / DC charging module and the DC / DC charging module are integrated into one system, which can give play to the long-term operation reliability advantage of the AC / DC charging module and the high efficiency advantage of the energy storage battery directly charging the vehicle through the DC / DC charging module, with the lowest overall cost, higher efficiency and higher system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A flowchart of a control method for an energy storage charging system provided in an embodiment of the present application;

[0035] Figure 2 A structural block diagram of a control system for an energy storage charging system provided in an embodiment of the present application;

[0036] Figure 3 A schematic diagram of the structure of the energy storage charging pile system provided in the embodiment of the present application;

[0037] Figure 4 A control strategy block diagram for preferentially using an AC / DC charging module for charging according to an embodiment of the present application;

[0038] Figure 5 A specific flow chart of the power distribution unit provided in the embodiment of the present application distributing the actual output power. DETAILED DESCRIPTION

[0039] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0040] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0041] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0042] To facilitate understanding of the control method and system of the energy storage charging system provided in the embodiment of the present application, its application scenario is first explained. The control method and system of the energy storage charging system provided in the embodiment of the present application are used to improve the efficiency of the energy storage system and reduce costs. With the gradual popularization of new energy vehicles, however, in many scenarios, the AC power grid cannot provide sufficient electrical energy. In this case, a matching energy storage system to supplement the insufficient AC power supply capacity is a good solution. At present, there are two ways of superimposing energy storage on charging piles on the market. One is AC stacking storage, in which the energy storage battery converts the battery stored energy into AC power to power the charging pile through PCS; the other is DC stacking storage, in which the energy storage battery directly charges the car through DC / DC; these two methods have their own advantages and disadvantages, and the AC stacking technology is mature but the energy conversion efficiency is low; DC stacking storage has high energy conversion efficiency, but the related accessories are not mature yet and the cost is high. For this reason, the embodiment of the present application provides a control method and system for an energy storage charging system to improve the efficiency of the energy storage system and reduce costs. The following is a detailed description of the embodiment in conjunction with specific drawings.

[0043] refer to Figures 1 to 4 , Figure 1 A flowchart of a control method for an energy storage charging system provided in an embodiment of the present application; Figure 2 A structural block diagram of a control system for an energy storage charging system provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of the energy storage charging pile system provided in the embodiment of the present application; Figure 4 A control strategy block diagram for preferentially using an AC / DC charging module for charging according to an embodiment of the present application; Figure 5 A specific flow chart of the power distribution unit provided in the embodiment of the present application distributing the actual output power.

[0044] exist Figure 1 In the embodiment of the present application, a control method of an energy storage charging system is provided, comprising the following steps:

[0045] Using AC / DC charging modules and DC / DC charging modules, a storage charging system with a power range of 240kW to 1500kW is constructed;

[0046] Using the EMS management unit, the output power of the AC / DC charging module and the DC / DC charging module is controlled;

[0047] Use the power distribution unit to distribute the actual output power; refer to Figure 5 ,include:

[0048] Evaluate and allocate the priority of charging equipment to obtain the equipment priority;

[0049] Monitor the power module to obtain the status and energy efficiency information of the power module;

[0050] Based on the device priority and the status and energy efficiency information of the power module, weighting the power module is assigned to obtain a weight score of the power module;

[0051] The output power is allocated based on the weight scores of the power modules.

[0052] In the above technical scheme, an energy storage charging system with a power range of 240kW to 1500kW is constructed by using an AC / DC charging module and a DC / DC charging module; the output power of the AC / DC charging module and the DC / DC charging module is controlled by using an EMS management unit; the actual output power is distributed by using a power distribution unit; the advantages of AC stacked storage and DC stacked storage are combined, and the AC / DC charging module and the DC / DC charging module are integrated into one system, which can give play to the long-term operation reliability advantage of the AC / DC charging module and the high efficiency advantage of the energy storage battery directly charging the vehicle through the DC / DC charging module, with the lowest overall cost, higher efficiency and higher system reliability.

[0053] In a specific implementation scheme, a strategy of preferentially using the AC / DC charging module for charging is adopted to control the optimal working state.

[0054] In a specific implementation scheme, a switch circuit is provided for each of the AC / DC charging modules and the DC / DC charging modules to control the working state.

[0055] In a specific implementation scheme, the step of allocating the actual output power using the power allocation unit further includes:

[0056] The equipment requirements and the state changes of the power modules are monitored in real time, and the power allocation is adjusted dynamically.

[0057] exist Figure 2 In the embodiment of the present application, a control system of an energy storage charging system is provided, including:

[0058] AC / DC charging module and DC / DC charging module are used to build energy storage charging systems with a power range of 240kW to 1500kW;

[0059] An EMS management unit, used to manage and control the output power of the AC / DC charging module and the DC / DC charging module;

[0060] The power distribution unit is used to distribute the actual output power; it includes:

[0061] Evaluate and allocate the priority of charging equipment to obtain the equipment priority;

[0062] Monitor the power module to obtain the status and energy efficiency information of the power module;

[0063] Based on the device priority and the status and energy efficiency information of the power module, weighting the power module is assigned to obtain a weight score of the power module;

[0064] The output power is allocated based on the weight scores of the power modules.

[0065] In the above technical scheme, an energy storage charging system with a power range of 240kW to 1500kW is constructed by using an AC / DC charging module and a DC / DC charging module; the output power of the AC / DC charging module and the DC / DC charging module is controlled by using an EMS management unit; the actual output power is distributed by using a power distribution unit; the advantages of AC stacked storage and DC stacked storage are combined, and the AC / DC charging module and the DC / DC charging module are integrated into one system, which can give play to the long-term operation reliability advantage of the AC / DC charging module and the high efficiency advantage of the energy storage battery directly charging the vehicle through the DC / DC charging module, with the lowest overall cost, higher efficiency and higher system reliability.

[0066] Specifically, the control system of the energy storage charging system includes:

[0067] Taking the 480kW energy storage charging pile rectifier cabinet as an example, the same idea can be used to design energy storage charging systems in different power ranges such as 240kW to 1500kW by increasing or decreasing the number of AC / DC charging modules and DC / DC charging modules.

[0068] refer to Figure 3 The system is equipped with 215kWh energy storage batteries, 1 105kW PCS, 4 40kW AC / DC charging modules, and 8 40kW DC / DC charging modules. The AC power input is charged through the AC / DC charging module, and the energy storage battery is charged through the DC / DC charging module. At the same time, the AC / DC charging module and the DC / DC charging module can also work in parallel to achieve a maximum charging capacity of 480kW to charge the car. In this way, under the condition of 265kW AC power supply, the energy storage battery can be supplemented to output 480kW charging capacity to the car.

[0069] The system configures an EMS management unit to manage the output power of AC / DC and DC / DC charging modules to avoid AC input overload and battery output overload; it can also control the working state of the PCS to achieve the peak-valley price difference arbitrage function for users. It can communicate with the charging control board in real time, collect the status information of relevant modules, and give appropriate control information to ensure that the system works in the best state.

[0070] A switch loop is added in front of each module to separately control the AC input of each module, realize the control of the working state of each module, and can also control the static loss of the module to the greatest extent.

[0071] Reference Figure 4 , adopt the strategy of preferentially using the AC / DC charging module to charge the vehicle to maintain the battery in the best working state. The power distribution control strategy is as follows:

[0072] The power distribution unit calculates the number of modules to be connected according to the actual output power of each gun, and then determines which module to connect according to the position of the gun. The same output power is set for different modules connected to the same gun to enable different AC / DC charging modules and DC / DC charging modules to jointly charge the vehicle;

[0073] Assume: The charging guns numbered 1-4 are C1-4 respectively, and the output required powers are PO1-PO4 respectively;

[0074] The 4 AC / DC charging modules are ACDC1-ACDC4 respectively, and the output powers are PA1-PA4;

[0075] The 8 DC / DC charging modules are DCDC1-DCDC8 respectively, and the output powers are PD5-PD12.

[0076] 1) When PO1 < 80kW, PO2 < 80kW, PO3 < 160kW, PO4 < 160kW,

[0077] PA1 = PA2 = PO1 / 2, PA3 = PA4 = PO2 / 2,

[0078] PD5 = PD6 = PD7 = PD8 = PO3 / 4, PD9 = PO10 = PD11 = PD12 = PO4 / 4.

[0079] 2) When 80kW < PO1 < 160kW, 160kW < PO3 < 320kW,

[0080] PA1 = PA2 = PA3 = PA4 = PO1 / 4,

[0081] PD5 = PD6 = PD7 = PD8 = PD9 = PO10 = PD11 = PD12 = PO3 / 8

[0082] Simultaneously control PO2 and PO4 so that they cannot charge externally, and charge again after the PO1 and PO3 release modules.

[0083] 3) When 320kW < PO3 < 480kW,

[0084] PA1 = PA2 = PA3 = PA4 = PD5 = PD6 = PD7 = PD8 = PD9 = PO10 = PD11 = PD12 = PO 3 / 12;

[0085] Simultaneously control PO1, PO2, and PO4 so that they cannot charge externally, and charge again after the PO3 release module.

[0086] 4) When PO1 = 0, PO2 = 0, PO3 = 0, and PO4 < 80kW,

[0087] PA3 = PA4 = PO4 / 2,

[0088] PA1 = PA2 = PD5 = PD6 = PD7 = PD8 = PD9 = PO10 = PD11 = PD12 = 0;

[0089] Give priority to charging the vehicle with AC / DC.

[0090] 5) When PO1 = 0, PO2 = 0, PO3 = 0, and 80kW < PO4 < 160kW,

[0091] PO1 = PO2 = PO3 = PO4 = PA4 / 4,

[0092] PD5 = PD6 = PD7 = PD8 = PD9 = PO10 = PD11 = PD12 = 0;

[0093] Give priority to charging the vehicle with AC / DC.

[0094] In the above technical scheme, 1. The AC / DC module and the DC / DC module are integrated together to charge the car together. The type and number of the cut-in modules are calculated according to the required power of each gun and the output power of the power grid and the battery to ensure that the system always works in the most efficient state; 2. In the system where the charging pile rectifier cabinet is equipped with both the AC / DC charging module and the DC / DC charging module, the EMS is used to control the output power of the AC / DC charging module and the DC / DC charging module respectively to ensure that the system does not cause AC power supply overload and energy storage system trigger fault protection; 3. In the system where the charging pile rectifier cabinet is equipped with both the AC / DC charging module and the DC / DC charging module, a switch circuit is added in front of each module to control the input power supply of each module; 4. In the system where the charging pile rectifier cabinet is equipped with both the AC / DC charging module and the DC / DC charging module, the strategy of using the AC / DC charging module to charge the car is adopted to maintain the battery in the best working state; 5. The energy storage system can be expanded in number to achieve higher power charging capacity and longer charging capacity.

[0095] In a specific implementation scheme, a strategy of preferentially using the AC / DC charging module for charging is adopted to control the optimal working state.

[0096] In a specific implementation scheme, a switch circuit is provided for each of the AC / DC charging modules and the DC / DC charging modules to control the working state.

[0097] In a specific implementation scheme, the power distribution unit distributes the actual output power and further includes:

[0098] The equipment requirements and the state changes of the power modules are monitored in real time, and the power allocation is adjusted dynamically.

[0099] An embodiment of the present application also provides an electronic device, comprising a processor, wherein the processor is coupled to a memory, wherein at least one computer program is stored in the memory, and the at least one computer program is loaded and executed by the processor so that the electronic device implements any one of the control methods for the energy storage charging system.

[0100] In the above technical scheme, an energy storage charging system with a power range of 240kW to 1500kW is constructed by using an AC / DC charging module and a DC / DC charging module; the output power of the AC / DC charging module and the DC / DC charging module is controlled by using an EMS management unit; the actual output power is distributed by using a power distribution unit; the advantages of AC stacked storage and DC stacked storage are combined, and the AC / DC charging module and the DC / DC charging module are integrated into one system, which can give play to the long-term operation reliability advantage of the AC / DC charging module and the high efficiency advantage of the energy storage battery directly charging the vehicle through the DC / DC charging module, with the lowest overall cost, higher efficiency and higher system reliability.

[0101] An embodiment of the present application also provides a computer-readable storage medium, in which at least one computer program is stored. The at least one computer program is loaded and executed by a processor so that the computer-readable storage medium implements any one of the control methods of the energy storage charging system.

[0102] In the above technical scheme, an energy storage charging system with a power range of 240kW to 1500kW is constructed by using an AC / DC charging module and a DC / DC charging module; the output power of the AC / DC charging module and the DC / DC charging module is controlled by using an EMS management unit; the actual output power is distributed by using a power distribution unit; the advantages of AC stacked storage and DC stacked storage are combined, and the AC / DC charging module and the DC / DC charging module are integrated into one system, which can give play to the long-term operation reliability advantage of the AC / DC charging module and the high efficiency advantage of the energy storage battery directly charging the vehicle through the DC / DC charging module, with the lowest overall cost, higher efficiency and higher system reliability.

[0103] Those skilled in the art will appreciate that the present application may be implemented as a system, method or computer program product.

[0104] Therefore, the present disclosure may be specifically implemented in the following forms, namely: it may be completely hardware, it may be completely software (including firmware, resident software, microcode, etc.), or it may be a combination of hardware and software, generally referred to herein as a "circuit", "module" or "system". In addition, in some embodiments, the present application may also be implemented in the form of a computer program product in one or more computer-readable media, and the computer-readable medium may contain computer-readable program code.

[0105] Any combination of one or more computer-readable media can be used. Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this document, computer-readable storage media can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0106] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art can change, modify, replace and modify the above embodiments within the scope of the present application. On this basis, a variety of replacements and improvements can be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A control method for an energy storage charging system, characterized in that: The following steps are involved: Using AC / DC charging modules and DC / DC charging modules, a storage charging system with a power range of 240kW to 1500kW is constructed; Using the EMS management unit, the output power of the AC / DC charging module and the DC / DC charging module is controlled; The actual output power is distributed using a power distribution unit, including: Evaluate and allocate the priority of charging equipment to obtain the equipment priority; Monitor the power module to obtain the status and energy efficiency information of the power module; Based on the device priority and the status and energy efficiency information of the power module, weighting the power module is assigned to obtain a weight score of the power module; The output power is allocated based on the weight scores of the power modules.

2. The control method of the energy storage charging system according to claim 1, characterized in that: A strategy of giving priority to charging with the AC / DC charging module is adopted to control the optimal working state.

3. The control method of the energy storage charging system according to claim 2, characterized in that: A switch loop is provided for each of the AC / DC charging modules and the DC / DC charging modules to control the working state.

4. The control method of the energy storage charging system according to claim 3, characterized in that: The step of distributing the actual output power by using the power distribution unit also includes: The equipment requirements and the state changes of the power modules are monitored in real time, and the power allocation is adjusted dynamically.

5. A control system for an energy storage charging system, characterized in that: include: AC / DC charging module and DC / DC charging module are used to build energy storage charging systems with a power range of 240kW to 1500kW; An EMS management unit, used to manage and control the output power of the AC / DC charging module and the DC / DC charging module; The power distribution unit is used to distribute the actual output power; it includes: Evaluate and allocate the priority of charging equipment to obtain the equipment priority; Monitor the power module to obtain the status and energy efficiency information of the power module; Based on the device priority and the status and energy efficiency information of the power module, weighting the power module is assigned to obtain a weight score of the power module; The output power is allocated based on the weight scores of the power modules.

6. The control system of the energy storage charging system according to claim 5, characterized in that: A strategy of giving priority to charging with the AC / DC charging module is adopted to control the optimal working state.

7. The control system of the energy storage charging system according to claim 6, characterized in that: A switch loop is provided for each of the AC / DC charging modules and the DC / DC charging modules to control the working state.

8. The control system of the energy storage charging system according to claim 7, characterized in that: The power distribution unit distributes the actual output power, and further includes: The equipment requirements and the state changes of the power modules are monitored in real time, and the power allocation is adjusted dynamically.

9. An electronic device, characterized in that: The electronic device includes a processor, the processor is coupled to a memory, at least one computer program is stored in the memory, and the at least one computer program is loaded and executed by the processor so that the electronic device implements the control method of the energy storage charging system as described in any one of claims 1 to 4.

10. A computer-readable storage medium, characterized in that: At least one computer program is stored in the computer-readable storage medium, and the at least one computer program is loaded and executed by the processor so that the computer-readable storage medium implements the control method of the energy storage charging system according to any one of claims 1 to 4.

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