A relay protection test system and method for an electrochemical energy storage power plant access system

Abstract

The application relates to a relay protection test system and method of an electrochemical energy storage power station access system, which comprises a power supply unit for simulating an electrochemical energy storage power station to perform charging and discharging; a voltage regulating circuit for regulating voltage and simulating battery charging and discharging characteristics; an energy storage monitoring host computer for starting energy storage operation and sending a battery simulation control command; a converter main circuit physical simulation unit for simulating a battery converter main circuit; a real-time simulation host computer for establishing an energy storage converter control model and a control program; a device for outputting a converter control command to a real-time simulation target machine; the real-time simulation target machine for controlling the converter main circuit physical simulation unit; a power system physical simulation unit for outputting electrical quantity primary values; and a mutual inductor simulation unit for converting the electrical quantity primary values into electrical quantity secondary values and outputting the electrical quantity secondary values to a relay protection device to be tested, so as to determine a test result based on the action of the relay protection device to be tested.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relay protection, and more particularly, to a relay protection test system and method for an electrochemical energy storage power station access system. BACKGROUND

[0002] Power system dynamic simulation technology is to simulate the dynamic process of the actual power system in the laboratory by using a small physical system according to the similarity principle, and is one of the effective methods to study the operating state and transient process of the power system. Compared with digital simulation, the dynamic simulation technology maintains the physical nature of the prototype system, can directly reflect the electromagnetic transient characteristics of the system, and can simulate the problems that cannot be completely represented by a digital model, and is complementary to digital simulation.

[0003] As an indispensable element and important fast and flexible adjustment resource in a new type of power system, energy storage plays an important role in system peak load shifting, peak supply guarantee, safety and stability, frequency and voltage regulation, etc. Compared with new energy power sources and synchronous machine power sources, the control strategy, operation mode and fault transient characteristics of electrochemical energy storage systems are more complex. During the fault, the energy storage battery can work in different states such as charging and discharging, and the energy storage converter can also be independently controlled in four quadrants. Compared with flexible DC, the fault transient characteristics of electrochemical energy storage systems are affected by the rapid switching process of the charging and discharging states, and the fault response characteristics during the rapid switching process of the charging and discharging states need to be considered.

[0004] The special fault characteristics of the energy storage power station change the electrical quantity characteristics after the power grid fault, thereby affecting the relay protection action performance. Therefore, the relay protection action performance in the scenario of the electrochemical energy storage power station access system needs to be fully verified by using a reasonable test method.

[0005] Therefore, there is a need for a relay protection test system and method for an electrochemical energy storage power station access system. SUMMARY

[0006] The present application proposes a relay protection test system and method for an electrochemical energy storage power station access system to solve the problem of how to test the protection action performance in the scenario of the electrochemical energy storage power station access system.

[0007] In order to solve the above problems, according to one aspect of the present application, a relay protection test system for an electrochemical energy storage power station access system is provided, which comprises: a power supply unit, a voltage regulation circuit, an energy storage monitoring host computer, a converter main circuit physical simulation unit, a real-time simulation host computer, a real-time simulation target machine, a power system physical simulation unit and a mutual inductor simulation unit; wherein,

[0008] The power supply unit is connected with the voltage regulation circuit, and is used to simulate the electrochemical energy storage power station for charging and discharging.

[0009] The voltage regulating circuit is connected with the energy storage monitoring host computer and the converter main circuit physical simulation unit respectively, and is used for adjusting voltage according to the received battery simulation control command, simulating the battery charge and discharge characteristics, and adjusting to the required operating condition.

[0010] The energy storage monitoring host computer is used for starting the energy storage operation and sending the battery simulation control command.

[0011] The converter main circuit physical simulation unit is connected with the real-time simulation target machine and the power system physical simulation unit respectively, and is used for simulating the battery converter main circuit.

[0012] The real-time simulation host computer is connected with the real-time simulation target machine, is used for establishing the energy storage converter control model and the control program, and downloading to the real-time simulation target machine, and is used for outputting the converter control command to the real-time simulation target machine.

[0013] The real-time simulation target machine is used for controlling the converter main circuit physical simulation unit based on the energy storage converter control model, the control program and the converter control command.

[0014] The power system physical simulation unit is connected with the mutual inductor simulation unit, and is used for performing the fault simulation of the power system and outputting the electrical quantity primary value.

[0015] The mutual inductor simulation unit is connected with the to-be-tested relay protection device, is used for converting the electrical quantity primary value into the electrical quantity secondary value and outputting to the to-be-tested relay protection device, and is used for determining the test result based on the action of the to-be-tested relay protection device.

[0016] Preferably, the power supply unit comprises a power supply and an auxiliary circuit, wherein,

[0017] The power supply is connected with the auxiliary circuit, and is used for providing power when simulating the battery discharge and absorbing power when simulating the battery charge.

[0018] The auxiliary circuit is connected with the voltage regulating circuit, and is used for optimizing the power factor and the harmonic content of the circuit.

[0019] Preferably, the converter main circuit physical simulation unit comprises a converter, a filter, a direct current bus and a unloading circuit.

[0020] The power system physical simulation unit comprises an alternating current transmission line, a transformer, a bus, a reactor, a circuit breaker and a step-up transformer.

[0021] Preferably, the power supply unit, the voltage regulating circuit and the converter main circuit physical simulation unit are sequentially connected through primary wiring.

[0022] Preferably, the system further comprises:

[0023] an interface conversion unit connected with the physical simulation unit of the main circuit of the converter and the real-time simulation target machine respectively, for realizing data interaction between the physical simulation unit of the main circuit of the converter and the real-time simulation target machine;

[0024] the real-time simulation target machine is configured to send the converter pulse signal or the reference signal to the physical simulation unit of the main circuit of the converter through the interface conversion unit to control the physical simulation unit of the main circuit of the converter, and configured to acquire the electrical quantity sampling value output by the physical simulation unit of the main circuit of the converter through the interface conversion unit.

[0025] Preferably, the real-time simulation host computer is further configured to:

[0026] modify the control parameters in the offline converter control strategy or the online converter control model, and map the control parameters to the corresponding program variables in the real-time simulation target machine.

[0027] According to another aspect of the present application, a relay protection test method of a relay protection test system based on the electrochemical energy storage power station access system is provided, the method comprising:

[0028] simulating the electrochemical energy storage power station by using the power supply unit to perform charging and discharging;

[0029] starting the energy storage operation by using the energy storage monitoring host computer, and sending the battery simulation control command to the voltage regulation circuit;

[0030] adjusting the voltage by using the voltage regulation circuit according to the received battery simulation control command to simulate the battery charging and discharging characteristics, so as to adjust to the required operating condition;

[0031] simulating the battery converter main circuit by using the physical simulation unit of the main circuit of the converter;

[0032] establishing the energy storage converter control model and the control program by using the real-time simulation host computer, downloading the energy storage converter control model and the control program to the real-time simulation target machine, and outputting the converter control command to the real-time simulation target machine, so that the real-time simulation target machine controls the physical simulation unit of the main circuit of the converter by using the energy storage converter control model, the control program and the converter control command;

[0033] performing fault simulation of the power system by using the power system physical simulation unit to output the electrical quantity primary value;

[0034] converting the electrical quantity primary value into the electrical quantity secondary value by using the mutual inductor simulation unit and outputting the electrical quantity secondary value to the relay protection device to be tested;

[0035] acquiring the action of the relay protection device to be tested to determine the test result.

[0036] Preferably, the method further comprises:

[0037] Power provided by the power supply connected to the auxiliary circuit in the power supply unit when simulating battery discharge and power absorbed when simulating battery charge;

[0038] Optimizing the power factor and harmonic content of the circuit using the auxiliary circuit.

[0039] Preferably, the method further comprises:

[0040] Data interaction between the physical simulation unit of the main circuit of the converter and the real-time simulation target machine is realized using the interface conversion unit;

[0041] The real-time simulation target machine sends a converter pulse signal or a reference signal to the physical simulation unit of the main circuit of the converter through the interface conversion unit to control the physical simulation unit of the main circuit of the converter, and the real-time simulation target machine acquires the electrical quantity sample value output by the physical simulation unit of the main circuit of the converter through the interface conversion unit.

[0042] Preferably, the method further comprises:

[0043] The control parameters in the converter control strategy or the control model are modified offline by the real-time simulation host computer or online, and are mapped to the corresponding program variables in the real-time simulation target machine.

[0044] According to another aspect of the present application, a computer readable storage medium is provided, which stores a computer program, and the program is executed by a processor to implement any one of the steps of the relay protection test method of the relay protection test system based on the electrochemical energy storage power station access system as described above.

[0045] The application provides a relay protection test system and method for an electrochemical energy storage power station access system, comprising: a power supply unit for simulating the electrochemical energy storage power station to perform charging and discharging; a voltage regulation circuit for regulating voltage according to a received battery simulation control command, simulating battery charging and discharging characteristics, and adjusting to a required operating condition; an energy storage monitoring host computer for starting energy storage operation and sending the battery simulation control command; a converter main circuit physical simulation unit for simulating a battery converter main circuit; a real-time simulation host computer for establishing an energy storage converter control model and a control program, and downloading to a real-time simulation target machine; a device for outputting a converter control command to the real-time simulation target machine; the real-time simulation target machine for controlling the converter main circuit physical simulation unit based on the energy storage converter control model, the control program and the converter control command; a power system physical simulation unit for performing power system fault simulation and outputting electrical quantity primary values; and a mutual inductor simulation unit for converting the electrical quantity primary values into electrical quantity secondary values and outputting to a relay protection device to be tested, so as to determine a test result based on the action of the relay protection device to be tested. The application simulates the electrochemical energy storage power station by using the power supply unit and the voltage regulation circuit, and the charging process does not need small lithium batteries for energy storage, but returns the electrical energy to the power supply, thereby reducing the safety hazards of the equipment; the energy storage and its converter and other primary systems adopt physical models, and the real-time simulation system is used to realize the energy storage control strategy. The energy storage converter control parameters and the real-time simulation host computer form a mapping relationship, so that the energy storage converter control parameters can be adjusted online according to the control parameter setting of the real-time simulation host computer according to the needs of the test project, and the test ability and test efficiency of the relay protection of the electrochemical energy storage power station access system can be greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0046] The exemplary embodiments of the application can be more completely understood in reference to the following drawings:

[0047] Figure 1 a structural schematic diagram of the relay protection test system 100 for the electrochemical energy storage power station access system according to the embodiments of the application;

[0048] Figure 2 a data interaction schematic diagram of the test system according to the embodiments of the application;

[0049] Figure 3 a schematic diagram of the test flow according to the embodiments of the application;

[0050] Figure 4 an example diagram of the simulated electrochemical energy storage power station access system according to the embodiments of the application;

[0051] Figure 5This is a flowchart of a relay protection test method 500 for a simulated electrochemical energy storage power station access system according to an embodiment of the present invention. Detailed Implementation

[0052] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0053] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0054] Figure 1 This is a schematic diagram of the relay protection testing system 100 of an electrochemical energy storage power station access system according to an embodiment of the present invention. Figure 1 As shown, the relay protection test system for an electrochemical energy storage power station access system provided in this embodiment of the invention uses a power supply unit and a voltage regulation circuit to simulate the electrochemical energy storage power station. The charging process does not require a small lithium battery for energy storage; instead, the electrical energy is fed back to the power supply, reducing equipment safety hazards. The primary system, including the energy storage and its converter, uses a physical model, while a real-time simulation system is used to implement the energy storage control strategy. The control parameters of the energy storage converter are mapped to the real-time simulation host computer, allowing for online adjustment of the energy storage converter control parameters based on the control parameter settings on the real-time simulation host computer, which can greatly improve the testing capability and efficiency of the relay protection of the electrochemical energy storage power station access system. The relay protection test system 100 simulating an electrochemical energy storage power station access system provided in this embodiment of the invention includes: a power supply unit 101, a voltage regulation circuit 102, an energy storage monitoring host computer 103, a converter main circuit physical simulation unit 104, a real-time simulation host computer 105, a real-time simulation target computer 106, a power system physical simulation unit 107, and a transformer simulation unit 108.

[0055] Preferably, the power supply unit 101 is connected to a voltage regulation circuit to simulate an electrochemical energy storage power station for charging and discharging.

[0056] Preferably, the power supply unit includes: a power supply and an auxiliary circuit; wherein,

[0057] The power supply is connected with the auxiliary circuit, and is used for providing power when simulating battery discharge and absorbing power when simulating battery charging.

[0058] The auxiliary circuit is connected with the voltage regulation circuit, and is used for optimizing the power factor and harmonic content of the circuit.

[0059] Preferably, the voltage regulation circuit 102 is connected with the energy storage monitoring host computer and the physical simulation unit of the main circuit of the converter, respectively, and is used for adjusting the voltage according to the received battery simulation control command, simulating the battery charge and discharge characteristics, and adjusting to the required operating condition.

[0060] In combination Figure 2 In the present application, the power supply unit includes a power supply and an auxiliary circuit, and the voltage regulation circuit is a Bi Buck-Boost circuit. The power supply and the auxiliary circuit and the Bi Buck-Boost circuit can simulate an electrochemical energy storage power station, wherein the power supply provides power when simulating battery discharge and absorbs power when simulating battery charging; the auxiliary circuit is used for optimizing the power factor and harmonic content of the circuit; and the Bi Buck-Boost circuit is used for adjusting the voltage and simulating the battery charge and discharge characteristics, so as to adjust to the required operating condition.

[0061] Preferably, the energy storage monitoring host computer 103 is used for starting the energy storage operation and sending the battery simulation control command.

[0062] In combination Figure 2 In the present application, the energy storage operation is started in the energy storage monitoring host computer. The energy storage monitoring host computer can provide a man-machine interactive interface, can set the simulation battery charge and discharge characteristics and send them to the Bi Buck-Boost circuit, and can collect and display the energy storage operation data.

[0063] Preferably, the physical simulation unit of the main circuit of the converter 104 is connected with a real-time simulation target machine and a power system physical simulation unit, respectively, and is used for simulating the battery converter main circuit.

[0064] Preferably, the physical simulation unit of the main circuit of the converter includes a converter, a filter, a DC bus and a unloading circuit.

[0065] The power system physical simulation unit includes an AC transmission line, a transformer, a bus, a reactor, a circuit breaker and a step-up transformer.

[0066] Preferably, the power supply unit, the voltage regulation circuit, the physical simulation unit of the main circuit of the converter and the power system simulation unit are sequentially connected through primary wiring.

[0067] In combination Figure 2As shown, in the present application, the power supply unit, the voltage regulating circuit, and the physical simulation unit of the main circuit of the converter are connected in sequence through the primary wiring. The physical simulation unit of the main circuit of the converter comprises a converter, a filter, a DC bus, a discharge circuit, etc., and is used to simulate the main circuit of the battery converter.

[0068] Preferably, the real-time simulation host computer 105 is connected with the real-time simulation target machine, and is used to establish a control model and a control program of the energy storage converter and download them to the real-time simulation target machine, and output the control command of the converter to the real-time simulation target machine.

[0069] Preferably, the real-time simulation target machine 106 is used to control the physical simulation unit of the main circuit of the converter based on the control model, the control program, and the control command of the converter.

[0070] Preferably, the system further comprises:

[0071] The interface conversion unit is connected with the physical simulation unit of the main circuit of the converter and the real-time simulation target machine respectively, and is used to realize the data interaction between the physical simulation unit of the main circuit of the converter and the real-time simulation target machine.

[0072] The real-time simulation target machine is used to send the pulse signal or the reference signal of the converter to the physical simulation unit of the main circuit of the converter through the interface conversion unit to control the physical simulation unit of the main circuit of the converter, and is used to acquire the electrical quantity sampling value output by the physical simulation unit of the main circuit of the converter through the interface conversion unit.

[0073] Preferably, the real-time simulation host computer is further used to:

[0074] modify the control parameters in the control strategy of the converter or the control model offline, and map them to the corresponding program variables in the real-time simulation target machine.

[0075] In combination Figure 2 As shown, in the present application, the real-time simulation target machine provides the control function of the physical simulation unit of the main circuit of the converter, receives the electrical quantity sampling value and outputs the pulse signal or the reference signal of the converter to the physical simulation unit of the main circuit of the converter through the interface conversion unit, wherein the electrical quantity sampling value comprises the AC side voltage, the current, the DC side bus voltage, etc. The real-time simulation host computer provides a man-machine interface, can modify the control strategy of the converter offline, can modify the control parameters in the control model of the converter online, and maps them to the corresponding program variables in the real-time simulation target machine.

[0076] In the present application, the energy storage converter control model is established in the real-time simulation host computer, the energy storage converter control program is generated in the real-time simulation host computer, the energy storage converter control program is downloaded to the real-time simulation target machine and starts running, and reasonable converter control parameters are set in the real-time simulation host computer in combination with the test project requirements, wherein the parameter setting should be within the parameter range obtained through early debugging.

[0077] Preferably, the power system physical simulation unit 107 is connected with the transformer simulation unit, used for fault simulation of the power system, and outputs the electrical quantity primary value.

[0078] Preferably, the transformer simulation unit 108 is connected with the relay protection device to be tested, used for converting the electrical quantity primary value into an electrical quantity secondary value and outputting to the relay protection device to be tested, so as to determine the test result based on the action of the relay protection device to be tested.

[0079] In combination with Figure 2 As shown in the present application, the power system simulation unit is a parameter-scaled-down power system, including physical simulation elements such as AC transmission line, transformer, bus, reactor, circuit breaker and booster transformer. The simulation fault points are set in the physical simulation elements, which can simulate short-time short-circuit or open-circuit fault. The transformer simulation unit can simulate current transformer or voltage transformer. The transformer simulation unit is connected with the power system physical simulation unit at the primary side and connected with the relay protection device to be tested at the secondary side, which converts the electrical quantity primary value of the power system physical simulation unit into a secondary value and sends it to the relay protection device to be tested. According to the action of the relay protection device to be tested, the test result can be determined.

[0080] Specifically, in combination with Figure 3 As shown in the present application, the test process includes:

[0081] (1) Establishing the energy storage converter control model in the real-time simulation host computer.

[0082] (2) Generating the energy storage converter control program in the real-time simulation host computer.

[0083] (3) Downloading the energy storage converter control program to the real-time simulation target machine and starting running.

[0084] (4) Starting the energy storage operation in the energy storage monitoring host computer.

[0085] (5) Setting reasonable converter control parameters in the real-time simulation host computer in combination with the test project requirements, and the parameter setting should be within the parameter range obtained through early debugging.

[0086] (6) Monitoring the energy storage operation condition, adjusting to the required operation condition in combination with the test project requirements.

[0087] (7) According to the type of the protection device to be tested and the test item, simulate the fault in the power system physical simulation unit, for example, if the line protection is tested, a short-circuit fault of a certain time can be applied to the simulated line element.

[0088] (8) Observe and record the action of the relay protection device to be tested, record the fault waveform and protection action output through the wave recording device, observe the panel message of the protection device to be tested, and judge whether the protection device acts correctly.

[0089] (9) If other items need to be tested, return to step five, and if no other items need to be tested, end the test.

[0090] Figure 4 An example diagram of a simulated electrochemical energy storage power station connected system according to an embodiment of the present application. As shown in Figure 4 , the real-time simulation system adopts an RT-lab, the power supply adopts an alternating power supply, and the auxiliary circuit adopts a bidirectional PFC circuit and a bidirectional LLC resonant converter. The bidirectional PFC circuit is used for rectification and inversion of the alternating current power supply, and improves the power factor of the power supply; the bidirectional LLC resonant converter is used for suppressing the harmonic content of the circuit and reducing the interference to the power supply. The real-time simulation target machine interface conversion unit outputs the changed U α and U β as the reference voltage to the physical simulation unit of the main circuit of the converter.

[0091] The electrochemical energy storage power station usually adopts a small lithium battery model for dynamic simulation, and is prone to fire during long-term operation in the laboratory, which has safety hazards. Therefore, the relay protection test system and method of the electrochemical energy storage power station connected system proposed by the present application simulates the electrochemical energy storage power station by using a Bi Buck-Boost circuit, a power supply and an auxiliary circuit, and does not need a small lithium battery for energy storage during the charging process, but returns the electric energy to the power supply, thereby reducing the safety hazards of the equipment.

[0092] The control strategy of the device of the traditional physical dynamic simulation system for relay protection device test is usually fixedly stored in the control chip, and it is difficult to adjust the control strategy according to the test needs. The relay protection test system and method of the electrochemical energy storage power station connected system proposed by the present application has three advantages: first, all the running data of the energy storage converter, including the intermediate variables of the control, can be monitored through the real-time simulation upper computer, thereby improving the overall observability and measurability; second, the control parameters of the energy storage converter can be modified online through the upper computer, thereby improving the flexibility of the control; third, without embedded development skills, the control strategy and parameters of the energy storage converter can be modified, without considering the software and hardware cooperation problem, thereby reducing the threshold of the control strategy iteration.

[0093] Figure 5 This is a flowchart of a relay protection test method 500 for a simulated electrochemical energy storage power station access system according to an embodiment of the present invention. Figure 5 As shown, the relay protection test method 500 based on the relay protection test system of the electrochemical energy storage power station access system provided by the embodiment of the present invention starts from step 501. In step 501, the power supply unit is used to simulate the electrochemical energy storage power station to perform charging and discharging.

[0094] Preferably, the method further includes:

[0095] The power supply unit connected to the auxiliary circuit provides power during simulated battery discharge and absorbs power during simulated battery charging.

[0096] The power factor and harmonic content of the circuit are optimized by using auxiliary circuits.

[0097] Step 502: Start the energy storage operation using the energy storage monitoring host computer and send a battery simulation control command to the voltage regulation circuit.

[0098] Step 503: The voltage is adjusted by the voltage regulation circuit according to the received battery simulation control command to simulate the battery charging and discharging characteristics in order to adjust to the required operating conditions.

[0099] Step 504: Simulate the main circuit of the battery converter using the converter main circuit physical simulation unit.

[0100] Step 505: Establish the energy storage converter control model and control program using the real-time simulation host computer, download them to the real-time simulation target computer, and output converter control commands to the real-time simulation target computer so that the real-time simulation target computer can control the physical simulation unit of the converter main circuit using the energy storage converter control model, control program and converter control commands.

[0101] Step 506: Use the power system physical simulation unit to simulate power system faults and output primary values ​​of electrical quantities.

[0102] Step 507: Use the current transformer simulation unit to convert the primary value of the electrical quantity into a secondary value of the electrical quantity and output it to the relay protection device under test.

[0103] Step 508: Obtain the operation status of the relay protection device under test and determine the test results.

[0104] Preferably, the method further includes:

[0105] The interface conversion unit is used to realize data interaction between the physical simulation unit of the converter main circuit and the real-time simulation target machine.

[0106] The real-time simulation target machine sends converter pulse signals or reference signals to the converter main circuit physical simulation unit through the interface conversion unit to control the converter main circuit physical simulation unit; the real-time simulation target machine obtains the electrical quantity sampling values ​​output by the converter main circuit physical simulation unit through the interface conversion unit.

[0107] Preferably, the method further includes:

[0108] The control parameters in the converter control model are modified offline or online using the host computer of the real-time simulation, and then mapped to the corresponding program variables in the target machine of the real-time simulation.

[0109] The relay protection test method 500 for simulating an electrochemical energy storage power station access system in an embodiment of the present invention corresponds to the relay protection test system 100 for an electrochemical energy storage power station access system in another embodiment of the present invention, and will not be described again here.

[0110] According to another aspect of the present invention, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements any one of the steps of a relay protection testing method based on a relay protection testing system for an electrochemical energy storage power station access system as described above.

[0111] The invention has been described with reference to a few embodiments. However, as will be known to those skilled in the art, and as defined in the appended claims, other embodiments besides those disclosed above fall equivalently within the scope of the invention.

[0112] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the art, unless otherwise expressly defined herein. All references to “a / the / the [device, component, etc.]” ​​are openly interpreted as at least one instance of said device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed unless explicitly stated otherwise.

[0113] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0114] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks. Figure 1 one or more flow or blocks.

[0115] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more flow or blocks. Figure 1 one or more flow or blocks.

[0116] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks. Figure 1 one or more flow or blocks.

[0117] Finally, it should be noted that the above-mentioned embodiments are merely used to illustrate the technical solutions of the present application, but are not intended to limit the present application. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced, and any modification or replacement without departing from the spirit and scope of the present application should be covered within the scope of the claims of the present application.

Claims

1. A relay protection testing system for an electrochemical energy storage power station access system, characterized in that, The system includes: a power supply unit, a voltage regulation circuit, an energy storage monitoring host computer, a converter main circuit physical simulation unit, a real-time simulation host computer, a real-time simulation target computer, a power system physical simulation unit, and a current transformer simulation unit; wherein... The power supply unit is connected to the voltage regulation circuit and is used to simulate an electrochemical energy storage power station for charging and discharging. The voltage regulation circuit is connected to the energy storage monitoring host computer and the converter main circuit physical simulation unit, respectively. It is used to adjust the voltage according to the received battery simulation control command, simulate the battery charging and discharging characteristics, and adjust to the required operating conditions. The energy storage monitoring host computer is used to start the energy storage operation and send the battery simulation control command; The converter main circuit physical simulation unit is connected to the real-time simulation target machine and the power system physical simulation unit respectively, and is used to simulate the battery converter main circuit. The real-time simulation host computer is connected to the real-time simulation target computer and is used to establish the energy storage converter control model and control program, and download them to the real-time simulation target computer; it is also used to output converter control commands to the real-time simulation target computer. The real-time simulation target machine is used to control the physical simulation unit of the main circuit of the converter based on the energy storage converter control model, control program and converter control commands; The power system physical simulation unit is connected to the instrument transformer simulation unit and is used to simulate power system faults and output primary values ​​of electrical quantities. The current transformer simulation unit is connected to the relay protection device under test and is used to convert the primary value of the electrical quantity into a secondary value of the electrical quantity and output it to the relay protection device under test so as to determine the test result based on the operation of the relay protection device under test. The converter main circuit physical simulation unit includes: converter, filter, DC bus and unloading circuit; The power system physical simulation unit includes: AC transmission lines, transformers, busbars, reactors, circuit breakers, and step-up transformers; The system also includes: The interface conversion unit is connected to the converter main circuit physical simulation unit and the real-time simulation target machine respectively, and is used to realize data interaction between the converter main circuit physical simulation unit and the real-time simulation target machine. The real-time simulation target machine is used to send converter pulse signals or reference signals to the converter main circuit physical simulation unit through the interface conversion unit in order to control the converter main circuit physical simulation unit; it is also used to obtain the electrical quantity sampling values ​​output by the converter main circuit physical simulation unit through the interface conversion unit.

2. The system according to claim 1, characterized in that, The power supply unit includes: a power supply and auxiliary circuitry; wherein, The power source is connected to the auxiliary circuit and is used to provide power when simulating battery discharge and to absorb power when simulating battery charging. The auxiliary circuit is connected to the voltage regulation circuit and is used to optimize the power factor and harmonic content of the circuit.

3. The system according to claim 1, characterized in that, The power supply unit, voltage regulation circuit, and converter main circuit physical simulation unit are connected sequentially via a single wiring connection.

4. The system according to claim 1, characterized in that, The real-time simulation host computer is also used for: The control strategy of the converter can be modified offline or the control parameters in the converter control model can be modified online and mapped to the corresponding program variables in the real-time simulation target machine.

5. A relay protection testing method for a relay protection testing system based on any one of claims 1-4 of an electrochemical energy storage power station access system, characterized in that, The method includes: The power supply unit is used to simulate an electrochemical energy storage power station for charging and discharging. The energy storage system is started using the energy storage monitoring host computer, and a battery simulation control command is sent to the voltage regulation circuit. The voltage regulation circuit adjusts the voltage according to the received battery simulation control commands to simulate the battery charging and discharging characteristics in order to adjust to the required operating conditions. The main circuit of a battery converter is simulated using a physical simulation unit for the converter main circuit. A control model and control program for an energy storage converter are established using a real-time simulation host computer and downloaded to the real-time simulation target computer. Converter control commands are then output to the real-time simulation target computer so that the real-time simulation target computer can control the physical simulation unit of the converter main circuit using the energy storage converter control model, control program, and converter control commands. The power system physical simulation unit is used to simulate power system faults and output primary values ​​of electrical quantities. The primary value of the electrical quantity is converted into a secondary value of the electrical quantity using a current transformer simulation unit and then output to the relay protection device under test. Obtain the operating status of the relay protection device under test and determine the test results.

6. The method according to claim 5, characterized in that, The method further includes: The power supply unit connected to the auxiliary circuit provides power during simulated battery discharge and absorbs power during simulated battery charging. The power factor and harmonic content of the circuit are optimized by using auxiliary circuits.

7. The method according to claim 5, characterized in that, The method further includes: The interface conversion unit is used to realize data interaction between the physical simulation unit of the converter main circuit and the real-time simulation target machine. The real-time simulation target machine sends converter pulse signals or reference signals to the converter main circuit physical simulation unit through the interface conversion unit to control the converter main circuit physical simulation unit; the real-time simulation target machine obtains the electrical quantity sampling values ​​output by the converter main circuit physical simulation unit through the interface conversion unit.

8. The method according to claim 5, characterized in that, The method further includes: The control parameters in the converter control model are modified offline or online using the host computer of the real-time simulation, and then mapped to the corresponding program variables in the target machine of the real-time simulation.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method as described in any one of claims 4-8.

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