Cascade Energy Storage Control and Protection Device Verification System Based on Hardware-in-the-Loop Simulation and Establishment Method

Abstract

The present invention discloses a verification system and establishment method for a cascaded energy storage control and protection device based on hardware-in-the-loop simulation, which relates to the field of power electronics technology. The hardware-in-the-loop simulator is connected to the cascaded energy storage control and protection device through optical fibers, and a cascaded energy storage primary model and a communication model are built on the upper computer of the hardware-in-the-loop simulator. The cascaded energy storage primary model runs in the hardware-in-the-loop simulator, and the control instructions of the cascaded energy storage control and protection device and the monitoring of internal physical quantities are carried out on the upper computer of the cascaded energy storage control and protection device. The communication model ensures that all physical quantity information between the cascaded energy storage control and protection device and the hardware-in-the-loop simulator is transmitted through optical fibers. The location and occupied number of bits of the physical quantity information are determined by the defined communication point table, thereby realizing a comprehensive verification of the cascaded energy storage control and protection device, reducing potential safety hazards, while lowering the test cost and improving the test efficiency.

Description

Technical Field

[0001] The present invention relates to the field of power electronics technology, and particularly relates to a cascaded energy storage control and protection device verification system based on hardware-in-the-loop simulation and a building method thereof. Background Art

[0002] With the rapid development of wind and solar renewable energy, the uncertainty of wind and solar power generation power has brought great challenges to the real-time balance of power production and consumption, prompting the energy storage to develop in the direction of large-scale and high-capacity. The cascaded energy storage uses the method of cascading H-bridge circuits to increase the voltage and then connect to the power grid, and the battery clusters are dispersed and connected to the DC side of the cascaded H-bridge converter, which has the advantages of large single-machine capacity, high efficiency, fast response speed, etc. However, the cascaded energy storage includes many modules such as inverters and batteries. If the control and protection logic is incorrect, it is easy to cause potential safety hazards such as component failures and component damages. In addition, the cascaded 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 comprehensively verify the functions and performance of the cascaded energy storage control and protection device in a low-cost and high-efficiency manner.

[0003] Verifying the control and protection logic by means of pure off-line simulation has a slow running speed and low efficiency. The Chinese patent application with the authorization announcement number of "CN106712534B" discloses a hardware-in-the-loop simulation system for a high-voltage cascaded frequency converter, and the Chinese patent application with the publication number of "CN117872808A" discloses a hardware-in-the-loop simulation system and method for a VSG cascaded energy storage. The above two patent applications both verify the control and protection logic of the equipment by means of hardware-in-the-loop simulation. However, when building the hardware-in-the-loop simulation system, in addition to the necessary parts such as the upper computer of the hardware-in-the-loop simulator, the hardware-in-the-loop simulator, the control and protection device, and the upper computer of the cascaded energy storage control and protection device, the hardware also includes many hardware such as communication transfer boards, communication lines, wiring harnesses, I / O interfaces, etc., and the system building is relatively complex. Summary of the Invention

[0004] The functions and performance of the cascaded energy storage control and protection device need to be comprehensively verified. If a physical system is used for verification, the test cycle is long, the efficiency is low, and there are potential safety hazards. To solve this problem, the present invention provides a cascaded energy storage control and protection device verification system based on hardware-in-the-loop simulation and a building method thereof, which comprehensively verifies the cascaded energy storage control and protection device, reduces potential safety hazards, and at the same time reduces the test cost and improves the test efficiency.

[0005] On the one hand, the present invention provides a verification system for a cascaded energy storage control and protection device based on hardware-in-the-loop simulation, including a hardware-in-the-loop simulator host computer, a hardware-in-the-loop simulator, a cascaded energy storage control and protection device, and a cascaded energy storage control and protection device host computer. The hardware-in-the-loop simulator host computer is connected to the hardware-in-the-loop simulator through a network cable. The cascaded energy storage control and protection device host computer is connected to the cascaded energy storage control and protection device through a network cable. The hardware-in-the-loop simulator is connected to the cascaded energy storage control and protection device through an optical fiber. The hardware-in-the-loop simulator host computer is used to build a cascaded energy storage primary model and a communication model. The hardware-in-the-loop simulator is used to run the cascaded energy storage primary model and the communication model. The cascaded energy storage control and protection device host computer is used to issue control commands to the cascaded energy storage control and protection device and monitor the internal physical quantity information of the cascaded energy storage control and protection device. The cascaded energy storage control and protection device is used to execute the control commands issued by the cascaded energy storage control and protection device host computer. The cascaded energy storage primary model is used to simulate the actual primary equipment of the cascaded energy storage. On the one hand, the communication model sends the physical quantity information required by the cascaded energy storage control and protection device through the hardware-in-the-loop simulator and transmits it to the cascaded energy storage control and protection device through an optical fiber. On the other hand, the communication model receives the physical quantity information required by the cascaded energy storage primary model from the cascaded energy storage control and protection device through an optical fiber. The location and occupancy bits of each physical quantity information during the transmission through the optical fiber are determined by the defined communication point table.

[0006] Preferably, both the hardware-in-the-loop simulator and the cascaded energy storage control and protection device are equipped with Aurora high-speed serial communication interfaces. The Aurora high-speed serial communication interface of the hardware-in-the-loop simulator and the Aurora high-speed serial communication interface of the cascaded energy storage control and protection device are connected by an optical fiber.

[0007] Preferably, the cascaded energy storage primary model includes an analog power grid model, a disconnector model, a circuit breaker model, a capacitor charging resistor model, a capacitor charging resistor bypass switch model, a reactor model, a cascaded 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. The analog power grid model is connected in series with the disconnector model, the disconnector model is connected in series with the circuit breaker model, the circuit breaker model is connected in series with the capacitor charging resistor model, 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 jointly connected in parallel with the battery charging resistor bypass switch model.

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

[0009] Preferably, the parameters of the analog power grid model are used to simulate inertia response, primary frequency regulation, grid strength tolerance, frequency tolerance, phase angle jump tolerance, voltage amplitude jump tolerance, voltage tolerance, and damping characteristic 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 closing state of the disconnector model, the closing state of the circuit breaker model, the closing state of the capacitor charging resistor bypass switch model, the closing state of the battery charging resistor switch model, the closing state of the battery charging resistor bypass switch model, the pulse information of the cascaded energy storage converter model, the control state of the disconnector 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 the same as the number of bits of the actual analog-to-digital converter.

[0012] The bit numbers occupied by the closed position state of the disconnector model, the closed position state of the circuit breaker model, the closed position state of the capacitor charging resistor bypass switch model, the closed position state of the battery charging resistor switch model, the closed position state of the battery charging resistor bypass switch model, the control state of the disconnector 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;

[0013] The bit number occupied by the pulse information of the cascaded energy storage converter model is 4 bits.

[0014] 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 position state of the disconnector model, the closed position state of the circuit breaker model, the closed position state of the capacitor charging resistor bypass switch model, the closed position state of the battery charging resistor switch model, and the closed position state of the battery charging resistor bypass switch model to the cascaded energy storage control and protection device through the optical fiber;

[0015] The communication model transmits the pulse information of the cascaded energy storage converter model, the control state of the disconnector 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 cascaded energy storage primary model.

[0016] On the other hand, the present invention provides a method for establishing a cascaded energy storage control and protection device verification system based on hardware-in-the-loop simulation, and the method includes the following steps:

[0017] S1. Connect the hardware-in-the-loop simulator and the cascaded energy storage control and protection device through an optical fiber; connect the upper computer of the hardware-in-the-loop simulator and the hardware-in-the-loop simulator through a network cable, and connect the cascaded energy storage control and protection device and the upper computer of the cascaded energy storage control and protection device through a network cable;

[0018] S2. Build the cascaded energy storage primary model on the upper computer of the hardware-in-the-loop simulator;

[0019] S3. Determine the physical quantity information transmitted by the optical fiber;

[0020] S4. Formulate a communication point table to determine the position and occupied bit number of the physical quantity information transmitted by the optical fiber;

[0021] S5. Build a communication model on the upper computer of the hardware-in-the-loop simulator according to the communication point table.

[0022] Preferably, the method further includes the following steps:

[0023] S6. Verify the correctness of the communication model;

[0024] S7. Conduct a comprehensive verification on the functions and performance of the cascaded energy storage control and protection device.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In the present invention, the semi-physical simulator is connected to the cascaded energy storage control and protection device through optical fibers, and a cascaded energy storage primary model and a communication model are built on the upper computer of the semi-physical simulator. The cascaded energy storage primary model and the communication model run in the semi-physical simulator. The upper computer of the cascaded energy storage control and protection device issues control commands to the cascaded energy storage control and protection device and monitors the internal physical quantity information. The cascaded energy storage control and protection device executes the control commands issued by the upper computer of the cascaded energy storage control and protection device. The cascaded energy storage primary model is used to simulate the actual primary equipment of the cascaded energy storage. The communication model transmits all physical quantity information between the cascaded energy storage control and protection device and the semi-physical simulator through optical fibers. The location and occupied number of bits of the physical quantity information are determined by the defined communication point table, thereby realizing a comprehensive verification of the cascaded energy storage control and protection device, reducing potential safety hazards, while reducing the test cost and improving the test efficiency.

[0027] The types of components and the relationships between the components in the cascaded energy storage primary model are consistent with those of the actual cascaded energy storage primary equipment, and can accurately simulate the physical characteristics of the cascaded energy storage primary equipment.

[0028] The functions and performance of the cascaded energy storage control and protection device need to be verified and optimized under different working conditions of the power grid. Simulating different working conditions requires modifying the parameters of the power grid frequency, amplitude, phase angle, and line impedance. However, changing the parameters of the actual power grid requires physical equipment of a power grid simulator, which is complex, costly, and inefficient. By changing the parameters of the simulated power grid model to simulate the working conditions caused by the changes of various parameters in the actual power grid, it has the advantages of simple implementation, low cost, and high efficiency.

[0029] The communication model transmits the physical quantity information through optical fibers. On the one hand, the number of bits occupied by the physical information is consistent with that 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 the verification efficiency. Description of the Drawings

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of a cascaded energy storage control and protection device verification system based on hardware-in-the-loop simulation provided by an embodiment of the present invention;

[0032] Figure 2 It is a flowchart of a method for establishing a cascaded energy storage control and protection device verification system based on hardware-in-the-loop simulation provided by an embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of a cascaded energy storage primary model of a cascaded energy storage control and protection device verification system based on hardware-in-the-loop simulation provided by an embodiment of the present invention.

[0034] Explanation of the reference numerals in the drawings: 1. Analog power grid model; 2. Disconnector 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 implementation manners

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] Embodiment 1

[0037] As Figure 1As shown in the figure, an embodiment of the present invention provides a verification system for a cascaded energy storage control and protection device based on hardware-in-the-loop simulation, which includes a hardware-in-the-loop simulator host computer, a hardware-in-the-loop simulator, a cascaded energy storage control and protection device, and a cascaded energy storage control and protection device host computer. The hardware-in-the-loop simulator host computer is connected to the hardware-in-the-loop simulator through a network cable. The cascaded energy storage control and protection device host computer is connected to the cascaded energy storage control and protection device through a network cable. Both the hardware-in-the-loop simulator and the cascaded energy storage control and protection device are equipped with Aurora high-speed serial communication interfaces. The Aurora high-speed serial communication interface of the hardware-in-the-loop simulator and the Aurora high-speed serial communication interface of the cascaded energy storage control and protection device are connected by optical fiber.

[0038] The hardware-in-the-loop simulator host computer is used to build a cascaded energy storage primary model and a communication model. The hardware-in-the-loop simulator is used to run the cascaded energy storage primary model and the communication model. The cascaded energy storage control and protection device host computer is used to issue control commands to the cascaded energy storage control and protection device and monitor the internal physical quantity information of the cascaded energy storage control and protection device. The cascaded energy storage control and protection device is used to execute the control commands issued by the cascaded energy storage control and protection device host computer. The cascaded energy storage primary model is used to simulate the actual primary equipment of the cascaded energy storage. On the one hand, the communication model sends the physical quantity information required by the cascaded energy storage control and protection device through the Aurora high-speed serial communication interface of the hardware-in-the-loop simulator and transmits it to the cascaded energy storage control and protection device through optical fiber. On the other hand, the communication model receives the physical quantity information required by the cascaded energy storage primary model from the Aurora high-speed serial communication interface of the cascaded energy storage control and protection device through optical fiber. The location and occupied bits of each physical quantity information during the transmission through optical fiber are determined by the defined communication point table.

[0039] Exemplarily, such as Figure 3As described above, the cascaded energy storage primary model includes a simulated power grid model 1, a disconnector 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 cascaded energy storage converter model 7, a DC filtering 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 disconnector model 2, the disconnector 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, 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 filtering module model 8 is connected in series with the DC side of the cascaded energy storage converter model 7, the DC filtering 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 jointly connected in parallel with the battery charging resistor bypass switch model 11.

[0040] 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 closing state of the disconnector model 2, the closing state of the circuit breaker model 3, the closing state of the capacitor charging resistor bypass switch model 5, the closing state of the battery charging resistor switch model 9, the closing 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.

[0041] 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 the same as the number of bits of the actual analog-to-digital converter.

[0042] The on - position status of the disconnector model 2, the on - position status of the circuit breaker model 3, the on - position status of the capacitor charging resistor bypass switch model 5, the on - position status of the battery charging resistor switch model 9, the on - position status of the battery charging resistor bypass switch model 11, the control status of the disconnector 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 each occupy 1 bit;

[0043] The pulse information of the cascaded energy storage converter model 7 occupies 4 bits.

[0044] 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.

[0045] Exemplarily, the parameters of the simulated power grid model 1 are used to simulate working conditions such as inertia response, primary frequency regulation, power grid strength tolerance, frequency tolerance, phase angle jump tolerance, voltage amplitude jump tolerance, voltage tolerance, and damping characteristics.

[0046] Exemplarily, the communication model transmits the grid - connected 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 on - position status of the disconnector model 2, the on - position status of the circuit breaker model 3, the on - position status of the capacitor charging resistor bypass switch model 5, the on - position status of the battery charging resistor switch model 9, and the on - position status of the battery charging resistor bypass switch model 11 to the cascaded energy storage control and protection device through the optical fiber;

[0047] The communication model transmits the pulse information of the cascaded energy storage converter model 7, the control status of the disconnector 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 to the cascaded energy storage primary model.

[0048] As Figure 2 described, the embodiment of the present invention also provides a method for establishing a cascaded energy storage control and protection device verification system based on hardware - in - the - loop simulation, and the method includes the following steps:

[0049] S1. Connect the hardware - in - the - loop simulator and the cascaded energy storage control and protection device through an optical fiber.

[0050] S2. Build the cascaded energy storage primary model on the upper computer of the hardware - in - the - loop simulator.

[0051] Specifically, the cascaded energy storage primary model includes a simulated power grid model 1, a disconnector 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 cascaded energy storage converter model 7, a DC filtering 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 disconnector model 2, the disconnector 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, 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 filtering module model 8 is connected in series with the DC side of the cascaded energy storage converter model 7, the DC filtering 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 jointly connected in parallel with the battery charging resistor bypass switch model 11.

[0052] Further, according to the actual system parameters, fill in the amplitude, frequency, phase angle, and line impedance of the simulated power grid model 1 in the cascaded 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 cascaded energy storage converter model 7, the capacitance of the cascaded energy storage converter model 7, the parameters of the DC filtering module model 8, the parameters of the battery charging resistor model 10, and the parameters of the battery model 12.

[0053] S3. Determine the physical quantity information transmitted by the optical fiber.

[0054] 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 closing state of the disconnector model 2, the closing state of the circuit breaker model 3, the closing state of the capacitor charging resistor bypass switch model 5, the closing state of the battery charging resistor switch model 9, the closing 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.

[0055] S4. Develop a communication point table to determine the location and occupied number of bits of the physical quantity information transmitted by the optical fiber.

[0056] 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 the actual analog-to-digital converter.

[0057] The occupied bit numbers of 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 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 are all 1 bit.

[0058] The occupied bit number of the pulse information of the cascaded energy storage converter model 7 is 4 bits.

[0059] S5. According to the communication point table, build a communication model on the host computer of the hardware-in-the-loop simulator.

[0060] Exemplarily, the method further includes the following steps:

[0061] S6. Verify the correctness of the communication model.

[0062] Specifically, set 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, and the closed state of the battery charging resistor bypass switch model 11 as fixed values on the host computer of the hardware-in-the-loop simulator, and check whether they are consistent with the host computer of the cascaded energy storage control and protection device.

[0063] Set 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, the control state of the battery charging resistor bypass switch model 11, etc. as fixed values from the host computer of the cascaded energy storage control and protection device, and check whether they are consistent with the host computer of the hardware-in-the-loop simulator.

[0064] Further, when there are any inconsistencies in the verified communication model data, it is necessary to rebuild the communication model on the host computer of the hardware-in-the-loop simulator according to the communication point table. When the verified communication model data is consistent, proceed to the next step.

[0065] S7. Comprehensively verify the functions and performance of the cascaded energy storage control and protection device.

[0066] Specifically, modify the frequency of the simulated power grid model 1 to simulate the primary frequency regulation, frequency tolerance ability, and damping characteristic conditions.

[0067] Modify the amplitude of the simulated power grid model 1 to simulate the voltage amplitude jump tolerance ability and voltage tolerance ability conditions.

[0068] Modify the line impedance of the simulated power grid model 1 to simulate the grid strength tolerance ability conditions.

[0069] Modify the phase angle of the simulated power grid model 1 to simulate the phase angle jump tolerance ability conditions.

[0070] By simulating the above conditions, comprehensively verify the functions and performances of the cascaded energy storage control and protection device.

[0071] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0072] 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 equivalent technologies, 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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