Cascaded energy storage control and protection device verification system based on semi-physical simulation and establishment method

Abstract

The invention discloses a cascaded energy storage control and protection device verification system based on semi-physical simulation and an establishment method, and relates to the technical field of power electronics. A semi-physical simulator is connected with a cascaded energy storage control and protection device through an optical fiber, and a cascaded energy storage primary model and a communication model are established on an upper computer of the semi-physical simulator; the cascade energy storage primary model runs in the semi-physical simulator, a control instruction of the cascade energy storage control and protection device and monitoring of internal physical quantities are performed on an upper computer of the cascade energy storage control and protection device, and the communication model ensures that all physical quantity information between the cascade energy storage control and protection device and the semi-physical simulator is transmitted by the optical fiber. The position of the physical quantity information and the occupied digits are determined by the defined communication point table, so that comprehensive verification of the cascade energy storage control and protection device is realized, potential safety hazards are reduced, the test cost is reduced, and the test efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of power electronics technology, and in particular to a verification system and an establishment method for a cascade energy storage control and protection device based on semi-physical simulation. Background Art

[0002] With the rapid development of wind and solar renewable energy, the uncertainty of wind and solar power generation has brought huge challenges to the real-time balance of electricity production and consumption, prompting energy storage to develop in the direction of scale and large capacity. Cascade energy storage uses the H-bridge circuit cascade method to increase the voltage and then connect to the grid, and disperse the battery cluster to the DC side of the cascade H-bridge converter. It has the advantages of large single-machine capacity, high efficiency, and fast response speed. However, cascade energy storage contains many modules such as converters and batteries. If the control and protection logic is wrong, it is easy to cause safety hazards such as component failure and component damage. In addition, cascade energy storage has multiple functions and complex test conditions. If actual equipment is used for testing, the test cycle is long and the efficiency is low. Therefore, it is necessary to fully verify the functions and performance of the cascade energy storage control and protection device in a low-cost and efficient manner.

[0003] The method of verifying the control and protection logic by pure offline simulation has slow operation speed and low efficiency. The Chinese patent application with the authorization announcement number "CN106712534B" discloses a semi-physical simulation system for high-voltage cascade inverters, and the Chinese patent application with the publication number "CN117872808A" discloses a semi-physical simulation system and method for VSG cascade energy storage. Both of the above patent applications verify the control and protection logic of the equipment by semi-physical simulation. However, when establishing a semi-physical simulation system, the hardware part includes not only the necessary parts such as the semi-physical simulator host computer, the semi-physical simulator, the control and protection device, and the cascade energy storage control and protection device host computer, but also includes many hardware such as communication adapter boards, communication lines, wiring, I / O interfaces, etc., and the establishment of the system is relatively complicated. Summary of the invention

[0004] The functions and performance of the cascaded energy storage control and protection device need to be fully verified. If a physical system is used for verification, the test cycle is long, the efficiency is low, and there are safety hazards. To solve this problem, the present invention provides a verification system and establishment method for a cascaded energy storage control and protection device based on semi-physical simulation, which comprehensively verifies the cascaded energy storage control and protection device, reduces safety hazards, reduces testing costs, and improves testing efficiency.

[0005] On the one hand, the present invention provides a verification system for a cascade energy storage control and protection device based on semi-physical simulation, comprising a semi-physical simulator host computer, a semi-physical simulator, a cascade energy storage control and protection device and a cascade energy storage control and protection device host computer, wherein the semi-physical simulator host computer is connected to the semi-physical simulator via a network cable, the cascade energy storage control and protection device host computer is connected to the cascade energy storage control and protection device via a network cable, the semi-physical simulator is connected to the cascade energy storage control and protection device via an optical fiber, the semi-physical simulator host computer is used to build a cascade energy storage primary model and a communication model, the semi-physical simulator is used to run the cascade energy storage primary model and the communication model; the cascade energy storage control and protection device host computer is used to verify the cascade energy storage control and protection device. The protection device issues control instructions and monitors the internal physical quantity information of the cascade energy storage control and protection device; the cascade energy storage control and protection device is used to execute the control instructions issued by the upper computer of the cascade energy storage control and protection device; the primary model of the cascade energy storage is used to simulate the actual primary equipment of the cascade energy storage; on the one hand, the communication model sends the physical quantity information required by the cascade energy storage control and protection device through the semi-physical simulator, and transmits it to the cascade energy storage control and protection device through optical fiber, and on the other hand, the communication model receives the physical quantity information required by the primary model of the cascade energy storage from the cascade energy storage control and protection device through optical fiber, and the location and occupied bit number of each physical quantity information in the process of transmission through optical fiber are determined by the defined communication point table.

[0006] Preferably, the semi-physical simulator and the cascaded energy storage control and protection device both have Aurora high-speed serial communication interfaces, and the Aurora high-speed serial communication interface of the semi-physical simulator and the Aurora high-speed serial communication interface of the cascaded energy storage control and protection device are connected by optical fiber.

[0007] Preferably, the cascade energy storage primary model includes a simulated power grid model, an isolating switch model, a circuit breaker model, a capacitor charging resistor model, a capacitor charging resistor bypass switch model, a reactor model, a cascade energy storage converter model, a DC filter module model, a battery charging resistor switch model, a battery charging resistor model, a battery charging resistor bypass switch model and a battery model, wherein the simulated power grid model is connected in series with the isolating switch model, the isolating switch model is connected in series with the circuit breaker model, the circuit breaker model is connected in series with the capacitor charging resistor model, and the capacitor charging resistor model is connected in series with the reactor model. The capacitor charging resistor bypass switch model is connected in parallel with the capacitor charging resistor model, the reactor model is connected in series with the AC side of the cascaded energy storage converter model, the DC filter module model is connected in series with the DC side of the cascaded energy storage converter model, the DC filter module model is connected in series with the battery charging resistor switch model, the battery charging resistor switch model is connected in series with the battery charging resistor model, the battery charging resistor model is connected in series with the battery model, and the battery charging resistor switch model and the battery charging resistor model are connected in series and then connected in parallel with the battery charging resistor bypass switch model.

[0008] Preferably, the parameters of the simulated power grid model include frequency, amplitude, phase angle and line impedance, and the parameters of the simulated power grid model are all variable parameters.

[0009] Preferably, the simulated power grid model parameters are used to simulate inertia response, primary frequency modulation, power grid strength tolerance, frequency tolerance, phase angle jump tolerance, voltage amplitude jump tolerance, voltage tolerance, and damping characteristic working conditions.

[0010] Preferably, the physical quantity information includes the grid connection point voltage, the output current of the cascaded energy storage converter model, the capacitor voltage of the cascaded energy storage converter model, the closed state of the isolating switch model, the closed state of the circuit breaker model, the closed state of the capacitor charging resistor bypass switch model, the closed state of the battery charging resistor switch model, the closed state of the battery charging resistor bypass switch model, the pulse information of the cascaded energy storage converter model, the control state of the isolating switch model, the control state of the circuit breaker model, the control state of the capacitor charging resistor bypass switch model, the control state of the battery charging resistor switch model, and the control state of the battery charging resistor bypass switch model.

[0011] Preferably, the number of bits occupied by the grid connection point voltage, the output current of the cascaded energy storage converter model and the capacitor voltage of the cascaded energy storage converter model is consistent with the number of bits of an actual analog-to-digital converter.

[0012] The number of bits occupied by the closed state of the isolating switch model, the closed state of the circuit breaker model, the closed state of the capacitor charging resistor bypass switch model, the closed state of the battery charging resistor switch model, the closed state of the battery charging resistor bypass switch model, the control state of the isolating switch model, the control state of the circuit breaker model, the control state of the capacitor charging resistor bypass switch model, the control state of the battery charging resistor switch model, and the control state of the battery charging resistor bypass switch model are all 1 bit; The number of bits occupied by the pulse information of the cascaded energy storage converter model is 4 bits.

[0013] Preferably, the communication model transmits the grid connection point voltage, the output current of the cascaded energy storage converter model, the capacitor voltage of the cascaded energy storage converter model, the closed state of the isolation switch model, the closed state of the circuit breaker model, the closed state of the capacitor charging resistor bypass switch model, the closed state of the battery charging resistor switch model and the closed state of the battery charging resistor bypass switch model to the cascaded energy storage control and protection device through the optical fiber; The communication model transmits the pulse information of the cascade energy storage converter model, the control state of the isolating switch model, the control state of the circuit breaker model, the control state of the capacitor charging resistor bypass switch model, the control state of the battery charging resistor switch model and the control state of the battery charging resistor bypass switch model to the cascade energy storage primary model.

[0014] On the other hand, the present invention provides a method for establishing a verification system for a cascade energy storage control and protection device based on semi-physical simulation, the method comprising the following steps: S1, connecting the semi-physical simulator and the cascade energy storage control and protection device through optical fiber; connecting the semi-physical simulator host computer and the semi-physical simulator through a network cable, and connecting the cascade energy storage control and protection device and the cascade energy storage control and protection device host computer through a network cable; S2, building the cascade energy storage primary model on the host computer of the semi-physical simulator; S3, determining the physical quantity information transmitted by the optical fiber; S4, formulating a communication point table to determine the location and number of occupied bits of the physical quantity information transmitted by the optical fiber; S5. Building a communication model on the host computer of the semi-physical simulator according to the communication point table.

[0015] Preferably, the method further comprises the following steps: S6. Verify the correctness of the communication model; S7. Comprehensively verify the functions and performance of the cascade energy storage control and protection device.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention connects a semi-physical simulator with a cascade energy storage control and protection device through optical fiber, and builds a cascade energy storage primary model and a communication model on a host computer of the semi-physical simulator. The cascade energy storage primary model and the communication model run in the semi-physical simulator. The host computer of the cascade energy storage control and protection device issues control instructions to the cascade energy storage control and protection device and monitors internal physical quantity information. The cascade energy storage control and protection device executes the control instructions issued by the host computer of the cascade energy storage control and protection device. The cascade energy storage primary model is used to simulate the actual primary equipment of cascade energy storage. The communication model transmits all physical quantity information between the cascade energy storage control and protection device and the semi-physical simulator through optical fiber. The location of the physical quantity information and the number of occupied bits are determined by a defined communication point table, thereby achieving comprehensive verification of the cascade energy storage control and protection device, reducing safety hazards while reducing testing costs and improving testing efficiency.

[0017] The types of components and the relationships between components in the primary model of cascade energy storage are consistent with the actual primary cascade energy storage equipment, and can accurately simulate the physical characteristics of the primary cascade energy storage equipment.

[0018] The functions and performance of the cascaded energy storage control device need to be verified and optimized under different working conditions of the power grid. The simulation of different working conditions requires the modification of the frequency, amplitude, phase angle and line impedance parameters of the power grid. However, changing the parameters of the actual power grid requires physical equipment of the power grid simulator, which is complex, costly and inefficient. By changing the parameters of the simulated power grid model, the working conditions caused by the changes in various parameters in the actual power grid can be simulated, which has the advantages of simple implementation, low cost and high efficiency.

[0019] The communication model transmits the physical quantity information through optical fiber. On the one hand, the number of bits occupied by the physical information is consistent with the number of bits of the actual analog-to-digital converter, which can better simulate the actual system. On the other hand, it can avoid the use of voltage sampling boards, current sampling boards, input boards, and output boards, reduce the verification cycle of the cascaded energy storage control and protection device, and improve verification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a verification system for a cascaded energy storage control and protection device based on semi-physical simulation provided by an embodiment of the present invention; Figure 2A flow chart of a method for establishing a verification system for a cascaded energy storage control and protection device based on semi-physical simulation provided by an embodiment of the present invention; Figure 3 A schematic diagram of a primary model of a cascade energy storage control and protection device verification system based on semi-physical simulation provided in an embodiment of the present invention.

[0022] Explanation of the reference numerals in the figure: 1. Simulated power grid model; 2. Isolating switch model; 3. Circuit breaker model; 4. Capacitor charging resistor model; 5. Capacitor charging resistor bypass switch model; 6. Reactor model; 7. Cascaded energy storage converter model; 8. DC filter module model; 9. Battery charging resistor switch model; 10. Battery charging resistor model; 11. Battery charging resistor bypass switch model; 12. Battery model. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example 1 like Figure 1 As shown, an embodiment of the present invention provides a verification system for a cascade energy storage control and protection device based on semi-physical simulation, including a semi-physical simulator host computer, a semi-physical simulator, a cascade energy storage control and protection device, and a cascade energy storage control and protection device host computer, the semi-physical simulator host computer is connected to the semi-physical simulator via a network cable, the cascade energy storage control and protection device host computer is connected to the cascade energy storage control and protection device via a network cable, the semi-physical simulator and the cascade energy storage control and protection device both have an Aurora high-speed serial communication interface, and an optical fiber connects the Aurora high-speed serial communication interface of the semi-physical simulator and the Aurora high-speed serial communication interface of the cascade energy storage control and protection device.

[0025] The host computer of the semi-physical simulator is used to build a cascade energy storage primary model and a communication model, the semi-physical simulator is used to run the cascade energy storage primary model and the communication model, the host computer of the cascade energy storage control and protection device is used to issue control instructions to the cascade energy storage control and protection device and monitor the internal physical quantity information of the cascade energy storage control and protection device, the cascade energy storage control and protection device is used to execute the control instructions issued by the host computer of the cascade energy storage control and protection device, the primary model of cascade energy storage is used to simulate the actual primary equipment of cascade energy storage, the communication model on the one hand sends the physical quantity information required by the cascade energy storage control and protection device through the semi-physical simulator Aurora high-speed serial communication interface, and transmits it to the cascade energy storage control and protection device through optical fiber, the communication model on the other hand receives the physical quantity information required by the primary model of cascade energy storage from the Aurora high-speed serial communication interface of the cascade energy storage control and protection device through optical fiber, and the location and occupied bit number of each physical quantity information in the process of transmission through optical fiber are determined by the defined communication point table.

[0026] For example, Figure 3 The cascade energy storage primary model includes a simulated power grid model 1, an isolating switch model 2, a circuit breaker model 3, a capacitor charging resistor model 4, a capacitor charging resistor bypass switch model 5, a reactor model 6, a cascade energy storage converter model 7, a DC filter module model 8, a battery charging resistor switch model 9, a battery charging resistor model 10, a battery charging resistor bypass switch model 11 and a battery model 12. The simulated power grid model 1 is connected in series with the isolating switch model 2, the isolating switch model 2 is connected in series with the circuit breaker model 3, the circuit breaker model 3 is connected in series with the capacitor charging resistor model 4, and the capacitor charging resistor model 4 is connected in series with the reactor model 6. The capacitor charging resistor bypass switch model 5 is connected in parallel with the capacitor charging resistor model 4, the reactor model 6 is connected in series with the AC side of the cascaded energy storage converter model 7, the DC filter module model 8 is connected in series with the DC side of the cascaded energy storage converter model 7, the DC filter module model 8 is connected in series with the battery charging resistor switch model 9, the battery charging resistor switch model 9 is connected in series with the battery charging resistor model 10, the battery charging resistor model 10 is connected in series with the battery model 12, and the battery charging resistor switch model 9 and the battery charging resistor model 10 are connected in series and then connected in parallel with the battery charging resistor bypass switch model 11.

[0027] Exemplarily, the physical quantity information includes the grid connection point voltage, the output current of the cascaded energy storage converter model 7, the capacitor voltage of the cascaded energy storage converter model 7, the closed state of the disconnector model 2, the closed state of the circuit breaker model 3, the closed state of the capacitor charging resistor bypass switch model 5, the closed state of the battery charging resistor switch model 9, the closed state of the battery charging resistor bypass switch model 11, the pulse information of the cascaded energy storage converter model 7, the control state of the disconnector model 2, the control state of the circuit breaker model 3, the control state of the capacitor charging resistor bypass switch model 5, the control state of the battery charging resistor switch model 9 and the control state of the battery charging resistor bypass switch model 11.

[0028] Exemplarily, the number of bits occupied by the grid connection point voltage, the output current of the cascaded energy storage converter model 7 and the capacitor voltage of the cascaded energy storage converter model 7 is consistent with the number of bits of an actual analog-to-digital converter.

[0029] The number of bits occupied by the closed state of the isolating switch model 2, the closed state of the circuit breaker model 3, the closed state of the capacitor charging resistor bypass switch model 5, the closed state of the battery charging resistor switch model 9, the closed state of the battery charging resistor bypass switch model 11, the control state of the isolating switch model 2, the control state of the circuit breaker model 3, the control state of the capacitor charging resistor bypass switch model 5, the control state of the battery charging resistor switch model 9 and the control state of the battery charging resistor bypass switch model 11 is 1; The number of bits occupied by the pulse information of the cascaded energy storage converter model 7 is 4 bits.

[0030] Exemplarily, the parameters of the simulated power grid model 1 include frequency, amplitude, phase angle and line impedance, and the parameters of the simulated power grid model 1 are all variable parameters.

[0031] Exemplarily, the parameters of the simulated grid model 1 are used to simulate operating conditions such as inertia response, primary frequency modulation, grid strength tolerance, frequency tolerance, phase angle jump tolerance, voltage amplitude jump tolerance, voltage tolerance and damping characteristics.

[0032] Exemplarily, the communication model transmits the grid connection point voltage, the output current of the cascaded energy storage converter model 7, the capacitor voltage of the cascaded energy storage converter model 7, the closed state of the isolation switch model 2, the closed state of the circuit breaker model 3, the closed state of the capacitor charging resistor bypass switch model 5, the closed state of the battery charging resistor switch model 9, and the closed state of the battery charging resistor bypass switch model 11 to the cascaded energy storage control and protection device through the optical fiber; The communication model transmits the pulse information of the cascade energy storage inverter model 7, the control state of the isolating switch model 2, the control state of the circuit breaker model 3, the control state of the capacitor charging resistor bypass switch model 5, the control state of the battery charging resistor switch model 9 and the control state of the battery charging resistor bypass switch model 11 to the cascade energy storage primary model.

[0033] like Figure 2 The embodiment of the present invention further provides a method for establishing a verification system for a cascaded energy storage control and protection device based on semi-physical simulation, the method comprising the following steps: S1. Connecting the semi-physical simulator to the cascade energy storage control and protection device via an optical fiber.

[0034] S2. Building the primary model of the cascade energy storage on the host computer of the semi-physical simulator.

[0035] Specifically, the cascade energy storage primary model includes a simulated power grid model 1, an isolating switch model 2, a circuit breaker model 3, a capacitor charging resistor model 4, a capacitor charging resistor bypass switch model 5, a reactor model 6, a cascade energy storage converter model 7, a DC filter module model 8, a battery charging resistor switch model 9, a battery charging resistor model 10, a battery charging resistor bypass switch model 11 and a battery model 12. The simulated power grid model 1 is connected in series with the isolating switch model 2, the isolating switch model 2 is connected in series with the circuit breaker model 3, the circuit breaker model 3 is connected in series with the capacitor charging resistor model 4, and the capacitor charging resistor model 4 is connected in series with the reactor model 6. The capacitor charging resistor bypass switch model 5 is connected in parallel with the capacitor charging resistor model 4, the reactor model 6 is connected in series with the AC side of the cascaded energy storage converter model 7, the DC filter module model 8 is connected in series with the DC side of the cascaded energy storage converter model 7, the DC filter module model 8 is connected in series with the battery charging resistor switch model 9, the battery charging resistor switch model 9 is connected in series with the battery charging resistor model 10, the battery charging resistor model 10 is connected in series with the battery model 12, and the battery charging resistor switch model 9 and the battery charging resistor model 10 are connected in series and then connected in parallel with the battery charging resistor bypass switch model 11.

[0036] Furthermore, based on the actual system parameters, fill in the amplitude, frequency, phase angle and line impedance of the simulated power grid model 1 in the cascade energy storage primary model, the size of the capacitor charging resistor model 4, the parameters of the reactor model 6, the number of modules of the cascade energy storage converter model 7, the capacitor size of the cascade energy storage converter model 7, the parameters of the DC filter module model 8, the parameters of the battery charging resistor model 10 and the parameters of the battery model 12.

[0037] S3. Determine the physical quantity information transmitted by the optical fiber.

[0038] Specifically, the physical quantity information includes the grid connection point voltage, the output current of the cascaded energy storage converter model 7, the capacitor voltage of the cascaded energy storage converter model 7, the closed state of the isolating switch model 2, the closed state of the circuit breaker model 3, the closed state of the capacitor charging resistor bypass switch model 5, the closed state of the battery charging resistor switch model 9, the closed state of the battery charging resistor bypass switch model 11, the pulse information of the cascaded energy storage converter model 7, the control state of the isolating switch model 2, the control state of the circuit breaker model 3, the control state of the capacitor charging resistor bypass switch model 5, the control state of the battery charging resistor switch model 9 and the control state of the battery charging resistor bypass switch model 11.

[0039] S4. Formulate a communication point table to determine the location and number of occupied bits of the physical quantity information transmitted by the optical fiber.

[0040] Specifically, the number of bits occupied by the grid connection point voltage, the output current of the cascaded energy storage converter model 7 and the capacitor voltage of the cascaded energy storage converter model 7 is consistent with the number of bits of an actual analog-to-digital converter.

[0041] The closed state of the isolating switch model 2, the closed state of the circuit breaker model 3, the closed state of the capacitor charging resistor bypass switch model 5, the closed state of the battery charging resistor switch model 9, the closed state of the battery charging resistor bypass switch model 11, the control state of the isolating switch model 2, the control state of the circuit breaker model 3, the control state of the capacitor charging resistor bypass switch model 5, the control state of the battery charging resistor switch model 9 and the control state of the battery charging resistor bypass switch model 11 all occupy 1 bit.

[0042] The number of bits occupied by the pulse information of the cascaded energy storage converter model 7 is 4 bits.

[0043] S5. Building a communication model on the host computer of the semi-physical simulator according to the communication point table.

[0044] Exemplarily, the method further comprises the following steps: S6. Verify the correctness of the communication model.

[0045] Specifically, the grid connection point voltage, the output current of the cascaded energy storage converter model 7, the capacitor voltage of the cascaded energy storage converter model 7, the closed state of the isolating switch model 2, the closed state of the circuit breaker model 3, the closed state of the capacitor charging resistor bypass switch model 5, the closed state of the battery charging resistor switch model 9, and the closed state of the battery charging resistor bypass switch model 11 are set as fixed values ​​from the host computer of the semi-physical simulator, and checked for consistency with the host computer of the cascaded energy storage control and protection device.

[0046] The pulse information of the cascaded energy storage converter model 7, the control status of the isolating switch model 2, the control status of the circuit breaker model 3, the control status of the capacitor charging resistor bypass switch model 5, the control status of the battery charging resistor switch model 9, and the control status of the battery charging resistor bypass switch model 11 are set as fixed values ​​from the host computer of the cascaded energy storage control and protection device, and checked with the host computer of the semi-physical simulator for consistency.

[0047] Furthermore, when there is any inconsistency in the verified communication model data, it is necessary to rebuild the communication model on the host computer of the semi-physical simulator according to the communication point table, and proceed to the next step when the verified communication model data is consistent.

[0048] S7. Comprehensively verify the functions and performance of the cascade energy storage control and protection device.

[0049] Specifically, the frequency of the simulated power grid model 1 is modified to simulate primary frequency regulation, frequency tolerance and damping characteristic conditions.

[0050] Modify the amplitude of the simulated power grid model 1 to simulate the voltage amplitude jump tolerance capability and voltage tolerance capability conditions.

[0051] Modify the line impedance of the simulated power grid model 1 to simulate the power grid strength tolerance condition.

[0052] The phase angle of the simulated power grid model 1 is modified to simulate the phase angle jump tolerance capability condition.

[0053] By simulating the above working conditions, the functions and performance of the cascade energy storage control and protection device are fully verified.

[0054] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0055] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A verification system for a cascade energy storage control and protection device based on semi-physical simulation, characterized in that: The invention comprises a semi-physical simulator host computer, a semi-physical simulator, a cascade energy storage control and protection device and a cascade energy storage control and protection device host computer, wherein the semi-physical simulator host computer is connected to the semi-physical simulator via a network cable, the cascade energy storage control and protection device host computer is connected to the cascade energy storage control and protection device via a network cable, the semi-physical simulator and the cascade energy storage control and protection device are connected via an optical fiber, the semi-physical simulator host computer is used to build a cascade energy storage primary model and a communication model, the semi-physical simulator is used to run the cascade energy storage primary model and the communication model; the cascade energy storage control and protection device host computer is used to issue control instructions to the cascade energy storage control and protection device and monitor the cascade The internal physical quantity information of the energy storage control and protection device; the cascade energy storage control and protection device is used to execute the control instructions issued by the upper computer of the cascade energy storage control and protection device; the cascade energy storage primary model is used to simulate the actual primary equipment of the cascade energy storage; on the one hand, the communication model sends the physical quantity information required by the cascade energy storage control and protection device through the semi-physical simulator, and transmits it to the cascade energy storage control and protection device through optical fiber, and on the other hand, the communication model receives the physical quantity information required by the cascade energy storage primary model from the cascade energy storage control and protection device through optical fiber, and the location and occupied bit number of each physical quantity information in the process of transmission through optical fiber are determined by the defined communication point table.

2. The verification system for cascade energy storage control and protection device based on semi-physical simulation according to claim 1 is characterized in that: The semi-physical simulator and the cascaded energy storage control and protection device both have Aurora high-speed serial communication interfaces, and optical fiber connects the Aurora high-speed serial communication interface of the semi-physical simulator and the Aurora high-speed serial communication interface of the cascaded energy storage control and protection device.

3. The verification system of the cascade energy storage control and protection device based on semi-physical simulation according to claim 1 is characterized in that: The cascade energy storage primary model comprises a simulated power grid model (1), an isolating switch model (2), a circuit breaker model (3), a capacitor charging resistor model (4), a capacitor charging resistor bypass switch model (5), a reactor model (6), a cascade energy storage converter model (7), a DC filter module model (8), a battery charging resistor switch model (9), a battery charging resistor model (10), a battery charging resistor bypass switch model (11) and a battery model (12). The simulated power grid model (1) is connected in series with the isolating switch model (2), the isolating switch model (2) is connected in series with the circuit breaker model (3), the circuit breaker model (3) is connected in series with the capacitor charging resistor model (4), the capacitor charging resistor model (4) is connected in series with the reactor model ( 6) are connected in series, the capacitor charging resistor bypass switch model (5) is connected in parallel with the capacitor charging resistor model (4), the reactor model (6) is connected in series with the AC side of the cascaded energy storage converter model (7), the DC filter module model (8) is connected in series with the DC side of the cascaded energy storage converter model (7), the DC filter module model (8) is connected in series with the battery charging resistor switch model (9), the battery charging resistor switch model (9) is connected in series with the battery charging resistor model (10), the battery charging resistor model (10) is connected in series with the battery model (12), and the battery charging resistor switch model (9) and the battery charging resistor model (10) are connected in series and then connected in parallel with the battery charging resistor bypass switch model (11).

4. The verification system of the cascade energy storage control and protection device based on semi-physical simulation according to claim 3 is characterized in that: The parameters of the simulated power grid model (1) include frequency, amplitude, phase angle and line impedance.

5. The verification system of the cascade energy storage control and protection device based on semi-physical simulation according to claim 4 is characterized in that: The parameters of the simulated power grid model (1) are used to simulate inertia response, primary frequency regulation, power grid strength tolerance, frequency tolerance, phase angle jump tolerance, voltage amplitude jump tolerance, voltage tolerance and damping characteristic working conditions.

6. The verification system of the cascade energy storage control and protection device based on semi-physical simulation according to claim 3 is characterized in that: The physical quantity information includes the grid connection point voltage, the output current of the cascaded energy storage converter model (7), the capacitor voltage of the cascaded energy storage converter model (7), the closed state of the isolating switch model (2), the closed state of the circuit breaker model (3), the closed state of the capacitor charging resistor bypass switch model (5), the closed state of the battery charging resistor switch model (9), the closed state of the battery charging resistor bypass switch model (11), pulse information of the cascaded energy storage converter model (7), the control state of the isolating switch model (2), the control state of the circuit breaker model (3), the control state of the capacitor charging resistor bypass switch model (5), the control state of the battery charging resistor switch model (9), and the control state of the battery charging resistor bypass switch model (11).

7. The verification system of the cascade energy storage control and protection device based on semi-physical simulation according to claim 6 is characterized in that: The number of bits occupied by the grid connection point voltage, the output current of the cascaded energy storage converter model (7) and the capacitor voltage of the cascaded energy storage converter model (7) is consistent with the number of bits of an actual analog-to-digital converter; The number of bits occupied by the closed state of the isolating switch model (2), the closed state of the circuit breaker model (3), the closed state of the capacitor charging resistor bypass switch model (5), the closed state of the battery charging resistor switch model (9), the closed state of the battery charging resistor bypass switch model (11), the control state of the isolating switch model (2), the control state of the circuit breaker model (3), the control state of the capacitor charging resistor bypass switch model (5), the control state of the battery charging resistor switch model (9), and the control state of the battery charging resistor bypass switch model (11) are all 1 bit; The number of bits occupied by the pulse information of the cascaded energy storage converter model (7) is 4 bits.

8. The verification system of the cascade energy storage control and protection device based on semi-physical simulation according to claim 6 is characterized in that: The communication model transmits the grid connection point voltage, the output current of the cascaded energy storage converter model (7), the capacitor voltage of the cascaded energy storage converter model (7), the closed state of the isolation switch model (2), the closed state of the circuit breaker model (3), the closed state of the capacitor charging resistor bypass switch model (5), the closed state of the battery charging resistor switch model (9), and the closed state of the battery charging resistor bypass switch model (11) to the cascaded energy storage control and protection device via the optical fiber; The communication model transmits the pulse information of the cascade energy storage converter model (7), the control state of the isolating switch model (2), the control state of the circuit breaker model (3), the control state of the capacitor charging resistor bypass switch model (5), the control state of the battery charging resistor switch model (9) and the control state of the battery charging resistor bypass switch model (11) to the cascade energy storage primary model.

9. A method for establishing a verification system for a cascade energy storage control and protection device based on semi-physical simulation, characterized in that: The verification system for a cascade energy storage control and protection device based on semi-physical simulation according to any one of claims 1 to 8 is applied, and the method comprises the following steps: The semi-physical simulator is connected to the cascade energy storage control and protection device through an optical fiber; the host computer of the semi-physical simulator is connected to the semi-physical simulator through a network cable, and the cascade energy storage control and protection device is connected to the host computer of the cascade energy storage control and protection device through a network cable; Building the cascade energy storage primary model on the host computer of the semi-physical simulator; Determining the physical quantity information transmitted by the optical fiber; Formulate a communication point table to determine the location and number of occupied bits of the physical quantity information transmitted by the optical fiber; According to the communication point table, a communication model is built on the host computer of the semi-physical simulator.

10. The method for establishing a verification system for a cascaded energy storage control and protection device based on semi-physical simulation according to claim 9 is characterized in that: The method further comprises the following steps: Verifying the correctness of the communication model; The functions and performance of the cascade energy storage control and protection device are fully verified.

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