Relay protection test system and method of electrochemical energy storage power station access system

Abstract

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

Description

Technical Field

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

[0002] The power system dynamic simulation technology is based on the principle of similarity. It uses a small physical system in the laboratory to simulate the dynamic process of the actual power system. It is one of the effective methods to study the operating status and transient process of the power system. Compared with digital simulation, dynamic simulation technology maintains the physical essence of the prototype system, can directly reflect the electromagnetic transient characteristics of the system, simulate problems that cannot be fully expressed by digital models, and complement and verify with digital simulation.

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

[0004] The special fault characteristics of energy storage power stations cause changes in the electrical quantity characteristics of the power grid after a fault, thus affecting the performance of relay protection. Therefore, the performance of relay protection in the scenario of electrochemical energy storage power stations connected to the system needs to be fully verified using reasonable testing methods.

[0005] Therefore, a relay protection test system and method for an electrochemical energy storage power station access system is needed. Summary of the invention

[0006] The present invention 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 several protection action performances in the scenario of an electrochemical energy storage power station access system.

[0007] In order to solve the above problems, according to one aspect of the present invention, a relay protection test system for an electrochemical energy storage power station access system is provided, the system comprising: 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 transformer simulation unit; wherein,

[0008] The power supply unit is connected to the voltage regulating circuit and is used to simulate an electrochemical energy storage power station for charging and discharging;

[0009] The voltage regulating circuit is connected to the energy storage monitoring host computer and the converter main circuit physical simulation unit respectively, and 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;

[0010] The energy storage monitoring host computer is used to start the energy storage operation and send the battery simulation control command;

[0011] 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;

[0012] 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; and is used to output converter control commands to the real-time simulation target computer;

[0013] The real-time simulation target machine is used to control the physical simulation unit of the converter main circuit 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 to the transformer simulation unit and is used to simulate the fault of the power system and output the primary value of the electrical quantity;

[0015] The mutual inductor simulation unit is connected to the relay protection device to be tested, 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 to be tested, so as to determine the test result based on the action status of the relay protection device to be tested.

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

[0017] The power supply is connected to the auxiliary circuit and is used to provide power when simulating battery discharge and absorb power when simulating battery charging;

[0018] The auxiliary circuit is connected to the voltage regulating circuit and is used to optimize the power factor and harmonic content of the circuit.

[0019] Preferably, the converter main circuit physical simulation unit comprises: a converter, a filter, a DC bus and a load unloading circuit;

[0020] The power system physical simulation unit includes: an AC transmission line, a transformer, a busbar, 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 via a primary connection.

[0022] Preferably, the system further comprises:

[0023] 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;

[0024] The real-time simulation target machine is used to send a converter pulse signal or a reference signal to the converter main circuit physical simulation unit through the interface conversion unit to control the converter main circuit physical simulation unit; and is used to obtain the electrical quantity sampling value output by the converter main circuit physical simulation unit through the interface conversion unit.

[0025] Preferably, the real-time simulation host computer is also used for:

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

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

[0028] Use power supply units to simulate electrochemical energy storage power stations for charging and discharging;

[0029] Use the energy storage monitoring host computer to start the energy storage operation and send the battery simulation control command to the voltage regulation circuit;

[0030] Using a voltage regulation circuit to adjust the voltage according to the received battery simulation control command, simulating the battery charging and discharging characteristics, so as to adjust to the required operating conditions;

[0031] Using the converter main circuit physical simulation unit to simulate the battery converter main circuit;

[0032] Using a real-time simulation host computer to establish an energy storage converter control model and a control program, and download them to a real-time simulation target machine, and output a converter control command to the real-time simulation target machine, so that the real-time simulation target machine uses the energy storage converter control model, the control program and the converter control command to control the converter main circuit physical simulation unit;

[0033] Use the power system physical simulation unit to simulate power system faults and output the primary value of electrical quantities;

[0034] The primary value of the electrical quantity is converted into a secondary value of the electrical quantity by using a mutual inductor simulation unit and outputted to the relay protection device to be tested;

[0035] Obtain the action status of the relay protection device to be tested and determine the test results.

[0036] Preferably, the method further comprises:

[0037] Using a power source connected to the auxiliary circuit in the power source unit to provide power when simulating battery discharge and absorb power when simulating battery charging;

[0038] Auxiliary circuits are used to optimize the power factor and harmonic content of the circuit.

[0039] Preferably, the method further comprises:

[0040] The interface conversion unit is used to realize the data interaction between the converter main circuit physical simulation unit and the real-time simulation target machine;

[0041] Among them, the real-time simulation target machine sends a converter pulse signal or a reference signal 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 value output by the converter main circuit physical simulation unit through the interface conversion unit.

[0042] Preferably, the method further comprises:

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

[0044] According to another aspect of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any step of a relay protection test method of a relay protection test system of an electrochemical energy storage power station access system as described above.

[0045] The present invention provides a relay protection test system and method for an electrochemical energy storage power station access system, comprising: a power supply unit for simulating an electrochemical energy storage power station for charging and discharging; a voltage regulating circuit for regulating voltage according to a received battery simulation control command, simulating battery charging and discharging characteristics, so as to adjust 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 them to a real-time simulation target computer; for outputting converter control commands to the real-time simulation target computer; the real-time simulation target computer 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 simulating a fault of the power system and outputting a primary value of an electrical quantity; a mutual inductor simulation unit for converting the primary value of the electrical quantity into a secondary value of the electrical quantity and outputting it 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 present invention uses a power supply unit and a voltage regulation circuit to simulate an electrochemical energy storage power station. The charging process does not require a small lithium battery for energy storage, but instead returns the electric energy to the power supply, reducing the potential safety hazards of the equipment. The primary system such as the energy storage and its converter adopts a physical model, and the energy storage control strategy is implemented using a real-time simulation system. The control parameters of the energy storage converter form a mapping relationship with the real-time simulation host computer, so that the control parameters of the energy storage converter can be set in the real-time simulation host computer according to the needs of the test project, and the control parameters of the energy storage converter can be adjusted online, which can greatly improve the test capability and test efficiency of the relay protection of the electrochemical energy storage power station access system. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0047] Figure 1 It is a structural schematic diagram of a relay protection test system 100 of an electrochemical energy storage power station access system according to an embodiment of the present invention;

[0048] Figure 2 A schematic diagram of data interaction of a test system according to an embodiment of the present invention;

[0049] Figure 3 A schematic diagram of a test process according to an embodiment of the present invention;

[0050] Figure 4 An example diagram of a system for simulating access to an electrochemical energy storage power station according to an embodiment of the present invention;

[0051] Figure 5Flow chart of a relay protection test method 500 for simulating an electrochemical energy storage power station access system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0053] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0054] Figure 1 FIG. 1 is a schematic diagram of the structure of a relay protection test system 100 for 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 of the electrochemical energy storage power station access system provided by the embodiment of the present invention adopts 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, but returns the electric energy to the power supply, reducing the potential safety hazards of the equipment; the primary system such as the energy storage and its converter adopts a physical model, and the energy storage control strategy is implemented by using a real-time simulation system. The control parameters of the energy storage converter form a mapping relationship with the real-time simulation host computer, so that the control parameters of the energy storage converter can be set in the real-time simulation host computer according to the needs of the test project, and the control parameters of the energy storage converter can be adjusted online, which can greatly improve the test capability and test efficiency of the relay protection of the electrochemical energy storage power station access system. The relay protection test 100 simulating the electrochemical energy storage power station access system provided by the embodiment of the present 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 machine 106, a power system physical simulation unit 107 and a mutual inductor simulation unit 108.

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

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

[0057] The power supply is connected to the auxiliary circuit and is used to provide power when simulating battery discharge and absorb power when simulating battery charging;

[0058] The auxiliary circuit is connected to the voltage regulating circuit and is used to optimize the power factor and harmonic content of the circuit.

[0059] Preferably, the voltage regulating circuit 102 is connected to the energy storage monitoring host computer and the converter main circuit physical simulation unit respectively, and 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.

[0060] Combination Figure 2 As shown, in the present invention, 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 to optimize the power factor and harmonic content of the circuit; the Bi Buck-Boost circuit is used to adjust the voltage and simulate the battery charging and discharging characteristics to adjust the operating conditions required by the value.

[0061] Preferably, the energy storage monitoring host computer 103 is used to start the energy storage operation and send the battery simulation control command.

[0062] Combination Figure 2 As shown, in the present invention, the energy storage operation is started in the energy storage monitoring host computer. The energy storage monitoring host computer can provide a human-computer interaction interface, can set the simulated battery charging and discharging characteristics and send them to the Bi Buck-Boost circuit, and collect and display the energy storage operation data.

[0063] Preferably, the converter main circuit physical simulation unit 104 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.

[0064] Preferably, the converter main circuit physical simulation unit comprises: a converter, a filter, a DC bus and a load unloading circuit;

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

[0066] Preferably, the power supply unit, the voltage regulating circuit, the converter main circuit physical simulation unit and the power system simulation unit are sequentially connected through a primary connection.

[0067] Combination Figure 2As shown, in the present invention, the power supply unit, the voltage regulation circuit, and the converter main circuit physical simulation unit are connected in sequence through a primary connection. The converter main circuit physical simulation unit includes: a converter, a filter, a DC bus, a load unloading circuit, etc., which is used to simulate the battery converter main circuit.

[0068] Preferably, the real-time simulation host computer 105 is connected to the real-time simulation target machine, and is used to establish the energy storage converter control model and control program, and download them to the real-time simulation target machine; and is used to output converter control commands 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 converter main circuit based on the energy storage converter control model, the control program and the converter control command.

[0070] Preferably, the system further comprises:

[0071] 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;

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

[0073] Preferably, the real-time simulation host computer is also used for:

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

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

[0076] In the present invention, an energy storage inverter control model is established in a real-time simulation host computer, an energy storage inverter control program is generated in the real-time simulation host computer, the energy storage inverter control program is downloaded to a real-time simulation target machine and starts running, and in combination with the test project requirements, reasonable inverter control parameters are set in the real-time simulation host computer, wherein the parameter settings should be within the parameter range obtained by prior debugging.

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

[0078] Preferably, the mutual inductor simulation unit 108 is connected to the relay protection device to be tested, 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 to be tested, so as to determine the test result based on the action of the relay protection device to be tested.

[0079] Combination Figure 2 As shown, in the present invention, the power system simulation unit is a power system with proportionally reduced parameters, including physical simulation elements such as AC transmission lines, transformers, busbars, reactors, circuit breakers and step-up transformers. A simulated fault point is provided in the physical simulation element, which can simulate a short-time short circuit or open circuit fault. And the gamma group simulation unit can simulate a current transformer or a voltage transformer. The primary side of the transformer simulation unit is connected to the power system physical simulation unit, and the secondary side is connected to the relay protection device to be tested. The primary value of the electrical quantity of the power system physical simulation unit is converted into a secondary value and sent to the relay protection device to be tested. The test result can be determined according to the action of the relay protection device to be tested.

[0080] Specifically, combined Figure 3 As shown, in the present invention, the test process includes:

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

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

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

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

[0085] (5) According to the test project requirements, reasonable converter control parameters should be set in the real-time simulation host computer. The parameter settings should be within the parameter range obtained in advance.

[0086] (6) Monitor the operating status of energy storage and adjust to the required operating conditions based on the test project requirements.

[0087] (7) According to the type of protection device to be tested and the test items, simulate the fault in the physical simulation unit of the power system. For example, when testing line protection, a short-circuit fault can be imposed in the simulated line element for a certain period of time.

[0088] (8) Observe and record the operation of the relay protection device to be tested. The fault waveform and protection action output can be recorded through the recording device, and the panel message of the protection device to be tested can be observed to determine whether the protection is operating correctly.

[0089] (9) If other items need to be tested, return to step 5. If other items do not need to be tested, end the test.

[0090] Figure 4 FIG. 1 is an example diagram of a simulated electrochemical energy storage power station access system according to an embodiment of the present invention. Figure 4 As shown in the figure, the real-time simulation system uses RT-lab, the power supply uses AC power supply, and the auxiliary circuit uses bidirectional PFC circuit and bidirectional LLC resonant converter. The bidirectional PFC circuit is used to rectify and invert the AC and DC power supply and improve the power factor of the power supply; the bidirectional LLC resonant converter is used to suppress the circuit harmonic content and reduce the interference to the power supply. The real-time simulation target machine interface conversion unit outputs the changed U ark to the converter main circuit physical simulation unit. α and U β As a reference voltage.

[0091] Electrochemical energy storage power stations usually use small lithium battery models for dynamic simulation, which are prone to fire and safety hazards when running in the laboratory for a long time. Therefore, the relay protection test system and method of the electrochemical energy storage power station access system proposed in the present invention use Bi Buck-Boost circuits, power supplies and auxiliary circuits to simulate electrochemical energy storage power stations. The charging process does not require small lithium batteries for energy storage, but returns electrical energy to the power supply, reducing equipment safety hazards.

[0092] In traditional physical dynamic simulation systems for relay protection device testing, the control strategy of the equipment is usually fixed and stored in the control chip, which makes it difficult to adjust the control strategy according to the test needs. The relay protection test system and method for the electrochemical energy storage power station access system proposed in the present invention have three advantages: first, all operating data of the energy storage converter, including the intermediate variables of the control, can be monitored by a real-time simulation host computer, which improves the overall observability and measurability level; second, the control parameters of the energy storage converter can be modified online by the host computer, which improves the flexibility of control; third, it does not require embedded development skills to modify the control strategy and parameters of the energy storage converter, and there is no need to consider the coordination of software and hardware, which reduces the threshold for control strategy iteration.

[0093] Figure 5 FIG. 5 is a flow chart of a relay protection test method 500 for simulating an 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 of the relay protection test system based on the electrochemical energy storage power station access system as described above provided in an embodiment of the present invention starts from step 501. In step 501, a power supply unit is used to simulate an electrochemical energy storage power station for charging and discharging.

[0094] Preferably, the method further comprises:

[0095] Using a power source connected to the auxiliary circuit in the power source unit to provide power when simulating battery discharge and absorb power when simulating battery charging;

[0096] Auxiliary circuits are used to optimize the power factor and harmonic content of the circuit.

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

[0098] Step 503: Utilize the voltage regulation circuit to regulate the voltage according to the received battery simulation control command, simulate the battery charge and discharge characteristics, and adjust to the required operating condition.

[0099] Step 504: Use the converter main circuit physical simulation unit to simulate the battery converter main circuit.

[0100] Step 505, using the real-time simulation host computer to establish the energy storage converter control model and control program, and download them to the real-time simulation target machine, and output the converter control command to the real-time simulation target machine, so that the real-time simulation target machine uses the energy storage converter control model, control program and converter control command to control the converter main circuit physical simulation unit.

[0101] Step 506: Use the power system physical simulation unit to perform power system fault simulation and output the primary value of the electrical quantity.

[0102] Step 507: Use a 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 to be tested.

[0103] Step 508, obtaining the action status of the relay protection device to be tested and determining the test result.

[0104] Preferably, the method further comprises:

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

[0106] Among them, the real-time simulation target machine sends a converter pulse signal or a reference signal 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 value output by the converter main circuit physical simulation unit through the interface conversion unit.

[0107] Preferably, the method further comprises:

[0108] The real-time simulation host computer is used to modify the converter control strategy offline or the control parameters in the converter control model online, and mapped to the corresponding program variables in the real-time simulation target computer.

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

[0110] Based on another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the program is executed by a processor, any step of a relay protection test method of a relay protection test system based on the electrochemical energy storage power station access system as described above is implemented.

[0111] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0112] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a / said / the [means, components, etc.]" are to be openly interpreted as at least one instance of said means, components, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

[0113] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented 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 present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0115] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0116] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A relay protection test system for an electrochemical energy storage power station access system, characterized in that: The system includes: a power supply unit, a voltage regulating 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 transformer simulation unit; wherein, The power supply unit is connected to the voltage regulating circuit and is used to simulate an electrochemical energy storage power station for charging and discharging; The voltage regulating circuit is connected to the energy storage monitoring host computer and the converter main circuit physical simulation unit respectively, and 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; and is 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 converter main circuit based on the energy storage converter control model, the control program and the converter control command; The power system physical simulation unit is connected to the transformer simulation unit and is used to simulate the fault of the power system and output the primary value of the electrical quantity; The mutual inductor simulation unit is connected to the relay protection device to be tested, 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 to be tested, so as to determine the test result based on the action status of the relay protection device to be tested.

2. The system according to claim 1, characterized in that The power supply unit comprises: a power supply and an auxiliary circuit; wherein, The power supply is connected to the auxiliary circuit and is used to provide power when simulating battery discharge and absorb power when simulating battery charging; The auxiliary circuit is connected to the voltage regulating 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 converter main circuit physical simulation unit includes: a converter, a filter, a DC bus and a load unloading circuit; The power system physical simulation unit includes: an AC transmission line, a transformer, a busbar, a reactor, a circuit breaker and a step-up transformer.

4. The system according to claim 1, characterized in that The power supply unit, the voltage regulating circuit, and the converter main circuit physical simulation unit are connected in sequence through a primary connection.

5. The system according to claim 1, characterized in that The system further comprises: 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 a converter pulse signal or a reference signal to the converter main circuit physical simulation unit through the interface conversion unit to control the converter main circuit physical simulation unit; and is used to obtain the electrical quantity sampling value output by the converter main circuit physical simulation unit through the interface conversion unit.

6. The system according to claim 1, characterized in that The real-time simulation host computer is also used for: Modify the converter control strategy offline or modify the control parameters in the converter control model online, and map them to the corresponding program variables in the real-time simulation target machine.

7. A relay protection test method of a relay protection test system of an electrochemical energy storage power station access system based on any one of claims 1 to 6, characterized in that: The method comprises: Use power supply units to simulate electrochemical energy storage power stations for charging and discharging; Use the energy storage monitoring host computer to start the energy storage operation and send the battery simulation control command to the voltage regulation circuit; Using a voltage regulation circuit to adjust the voltage according to the received battery simulation control command, simulating the battery charging and discharging characteristics, so as to adjust to the required operating conditions; Using the converter main circuit physical simulation unit to simulate the battery converter main circuit; Using a real-time simulation host computer to establish an energy storage converter control model and a control program, and download them to a real-time simulation target machine, and output a converter control command to the real-time simulation target machine, so that the real-time simulation target machine uses the energy storage converter control model, the control program and the converter control command to control the converter main circuit physical simulation unit; Use the power system physical simulation unit to simulate the power system faults and output the primary value of the electrical quantity; The primary value of the electrical quantity is converted into a secondary value of the electrical quantity by using a mutual inductor simulation unit and outputted to the relay protection device to be tested; Obtain the action status of the relay protection device to be tested and determine the test results.

8. The method according to claim 7, characterized in that The method further comprises: Using a power source connected to the auxiliary circuit in the power source unit to provide power when simulating battery discharge and absorb power when simulating battery charging; Auxiliary circuits are used to optimize the power factor and harmonic content of the circuit.

9. The method according to claim 7, characterized in that: The method further comprises: The interface conversion unit is used to realize the data interaction between the converter main circuit physical simulation unit and the real-time simulation target machine; Among them, the real-time simulation target machine sends a converter pulse signal or a reference signal 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 value output by the converter main circuit physical simulation unit through the interface conversion unit.

10. The method according to claim 7, characterized in that The method further comprises: The real-time simulation host computer is used to modify the converter control strategy offline or the control parameters in the converter control model online, and mapped to the corresponding program variables in the real-time simulation target computer.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 6 to 10 are implemented.

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