Multi-direct-current cross-regional power grid stability control test system and method

Abstract

The invention provides a stability control test system and method for a multi-direct-current cross-regional power grid, and the system comprises a simulation device, a plurality of direct-current sub-station stability control devices and a main station stability control device, and the simulation device is in communication connection with each direct-current sub-station stability control device through a control and protection interface unit. The simulation device uploads electrical quantity information to each DC substation stability control device through a sampling unit; the main station stability control device is in communication connection with each DC sub-station stability control device. Deploying a primary power grid model, a direct current control and protection model and a control and protection interface model on the simulation device; the primary power grid model comprises a plurality of direct-current power grid simulation models, and the direct-current control and protection model is used for controlling the running states of the direct-current power grid simulation models; the control protection interface model is used for realizing information interaction between the simulation device and the direct current substation stability control device; the DC power grid simulation models are in one-to-one correspondence with the DC substation stability control devices. According to the multi-direct-current cross-regional power grid stability control test system and method provided by the embodiment of the invention, 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 multi-DC cross-region power grid stabilization control test system and method. Background Art

[0002] With the advancement of cross-regional UHV DC project construction, the "strong DC and weak AC" characteristics of the power grid have become more prominent. In order to ensure the safe operation of the power grid, it is necessary to establish a multi-DC cross-regional power grid stability control system to achieve stable control of regional or larger power systems.

[0003] In order to ensure the accuracy and effectiveness of the newly commissioned multi-DC inter-regional power grid stability control system after a power grid failure, it is necessary to undergo three stages of inspection and testing before entering the grid: factory testing, engineering verification, and on-site debugging. Among them, both factory testing and on-site debugging are experiments conducted using sampling debugging boxes and experimental settings. They can only verify whether the strategy is executed correctly under the specified operating state, and cannot provide feedback on the system response after the strategy is executed. Due to the limitations of experimental resources in existing engineering verification, it is impossible to configure multiple sets of DC control and protection devices according to the actual situation of the multi-DC inter-regional power grid stability control system, and different DC control and protection devices may belong to different equipment manufacturers. In the actual interface debugging link, the testing process is cumbersome and inefficient. Therefore, how to improve the testing efficiency of multi-DC inter-regional power grid stability control systems has become an important issue that needs to be solved in this field. Summary of the invention

[0004] In view of the problems in the prior art, an embodiment of the present invention provides a multi-DC cross-region power grid stability control test system and method, which can at least partially solve the problems existing in the prior art.

[0005] In a first aspect, the present invention provides a multi-DC cross-regional power grid stability control test system, including a simulation device, a plurality of DC substation stability control devices and a master station stability control device, wherein:

[0006] The simulation device is connected to each DC substation stabilization control device through the control and protection interface unit, and the simulation device uploads electrical quantity information to each DC substation stabilization control device through the sampling unit; the master station stabilization control device is connected to each DC substation stabilization control device through communication;

[0007] A primary power grid model, a DC control and protection model and a control and protection interface model are deployed on the simulation device; the primary power grid model includes multiple DC power grid simulation models, and the DC control and protection model is used to control the operating status of the DC power grid simulation model; the control and protection interface model is used to realize information interaction between the simulation device and the DC substation stabilization control device; the DC power grid simulation model and the DC substation stabilization control device have a one-to-one correspondence.

[0008] Furthermore, the control and protection interface unit has multiple input and output ports, and each input and output port corresponds to a DC power grid simulation model.

[0009] Furthermore, the control and protection interface unit adopts a GTFPGA board.

[0010] Furthermore, the sampling unit includes a GTAO interface card and a GTDO interface card.

[0011] Furthermore, the multi-DC cross-regional power grid stability control test system provided by an embodiment of the present invention also includes a modeling device, which is communicatively connected to the simulation device, and the modeling device is used to create the primary power grid model, the DC control and protection model and the control and protection interface model.

[0012] In a second aspect, the present invention provides a multi-DC inter-regional power grid stability control test method, which is applied to the multi-DC inter-regional power grid stability control test system described in any of the above embodiments, comprising:

[0013] The simulation device generates a control signal according to the test instruction and the DC control and protection model, and controls the operation of the primary power grid model to generate operation status information and electrical quantity information through the control signal; wherein the primary power grid model includes a DC power grid simulation model in a normal state and a DC power grid simulation model in a fault state during operation;

[0014] The simulation device generates control and protection state information of each DC power grid simulation model according to the operation state information and the control and protection interface model, and obtains electrical quantity information of each DC power grid simulation model according to the electrical quantity information;

[0015] The simulation device sends the control and protection status information of each DC power grid simulation model to the corresponding DC substation stabilization control device through the control and protection interface unit, and sends the electrical quantity information of each DC power grid simulation model to the corresponding DC substation stabilization control device through the sampling unit;

[0016] The simulation device receives the control and protection simulation feedback information returned by each DC substation stabilization and control device through the control and protection interface unit; wherein the control and protection simulation feedback information includes a modulation strategy; the modulation strategy is received by the DC substation stabilization and control device from the master station stabilization and control device, and is generated and issued by the master station stabilization and control device after receiving the power information reported by each DC substation stabilization and control device and determining that a power shortage occurs; the power information reported by each DC substation stabilization and control device is obtained based on the received control and protection status information and electrical quantity information;

[0017] The simulation device performs DC power modulation on the DC power grid simulation model corresponding to each DC substation stabilization control device according to the modulation strategy returned by each DC substation stabilization control device and the DC control and protection model, and obtains the modulation result of each DC power grid simulation model;

[0018] The simulation device obtains the test result according to each control and protection simulation feedback information and the modulation result of each DC power grid simulation model.

[0019] Furthermore, there are multiple test instructions, and each test instruction corresponds to at least one fault type of the DC power grid.

[0020] In a third aspect, the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the program to implement the multi-DC cross-regional power grid stability test method described in any of the above embodiments.

[0021] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program / instruction, and when the computer program / instruction is executed by a processor, the multi-DC cross-regional power grid stability test method described in any of the above embodiments is implemented.

[0022] In a fifth aspect, the present invention provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the multi-DC cross-regional power grid stability test method described in any of the above embodiments.

[0023] The multi-DC cross-regional power grid stability control test system and method provided by the embodiment of the present invention include a simulation device, multiple DC substation stability control devices and a master station stability control device. The simulation device is connected to each DC substation stability control device through a control and protection interface unit, and the simulation device uploads electrical quantity information to each DC substation stability control device through a sampling unit; the master station stability control device is connected to each DC substation stability control device in a communication manner; a primary power grid model, a DC control and protection model and a control and protection interface model are deployed on the simulation device; the primary power grid model includes multiple DC power grid simulation models, and the DC control and protection model is used to control the operating state of the DC power grid simulation model; the control and protection interface model is used to realize information interaction between the simulation device and the DC substation stability control device; the DC power grid simulation model corresponds to the DC substation stability control device one by one, and the actual DC control and protection device is replaced by the control and protection interface model and the control and protection interface unit, thereby avoiding the cumbersome testing process caused by the DC control and protection devices belonging to different equipment manufacturers, thereby improving the testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 It is a structural schematic diagram of a multi-DC cross-regional power grid stability control test system provided by the first embodiment of the present invention.

[0026] Figure 2 It is a structural schematic diagram of a multi-DC cross-regional power grid stability control test system provided by the second embodiment of the present invention.

[0027] Figure 3 It is a flow chart of a multi-DC cross-regional power grid stability control test method provided in the third embodiment of the present invention.

[0028] Figure 4 It is a flow chart of a multi-DC cross-regional power grid stability control test method provided in the fourth embodiment of the present invention.

[0029] Figure 5 It is a schematic diagram of the physical structure of an electronic device provided by the fifth embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily. The acquisition, storage, use, and processing of data in the technical scheme in this application comply with the relevant provisions of laws and regulations. The user information in the embodiments of the present application is obtained through legal and compliant channels, and the acquisition, storage, use, and processing of user information are authorized and agreed by the customer.

[0031] In order to facilitate understanding of the technical solution provided by this application, the relevant contents of the technical solution of this application are first explained below.

[0032] Real-time digital simulation technology: Real Time Digital Simulation, RTDS. RTDS technology can simulate the dynamic behavior of the power system in real time by building a highly realistic digital model.

[0033] Safety and stability control system: a system composed of two or more power plant stability control devices connected by communication equipment to achieve stable control of regional or larger power systems.

[0034] At present, the testing of newly built or renovated multi-DC cross-regional power grid stability control systems is mainly carried out through three links: factory testing, RTDS engineering verification, and on-site commissioning. There are mainly the following two defects.

[0035] (1) Both the factory test and the on-site debugging are conducted by sampling the debugging box and experimental setting values, which cannot simulate the actual grid operation conditions; and the requirements of closed-loop testing cannot be met. This testing method can only verify whether the strategy is executed correctly under the specified operating state, and cannot provide feedback on the system response after the strategy is executed, that is, it cannot verify the effectiveness of the strategy. (2) Due to the limitation of experimental resources in the existing engineering verification, it is impossible to configure multiple sets of DC control and protection devices according to the actual situation of the multi-DC cross-regional power grid stability control system, resulting in the inability to achieve coordinated control of all DC resources in the system. In addition, different DC control and protection devices may belong to different equipment manufacturers, and there are problems of cumbersome and inefficient testing process in the actual interface debugging link.

[0036] An embodiment of the present invention provides a multi-DC inter-regional power grid stability control test system, which solves the technical problems of high resource usage, cumbersome process and low efficiency in the construction process of the existing multi-DC inter-regional power grid stability control system closed-loop test platform by establishing a simulation model and a control and protection interface model consistent with the actual DC control and protection project, replacing the actual control and protection device in the experimental process.

[0037] Figure 1 is a schematic diagram of the structure of a multi-DC cross-regional power grid stability control test system provided by the first embodiment of the present invention, such as Figure 1 As shown, the multi-DC cross-regional power grid stability control test system provided by the embodiment of the present invention includes a simulation device 1, multiple DC substation stability control devices 2 and a master station stability control device 3, wherein:

[0038] The simulation device 1 is connected to each DC substation stabilization control device 3 through the control and protection interface unit 4, and the simulation device 1 uploads electrical quantity information to each DC substation stabilization control device 3 through the sampling unit 5; the main station stabilization control device 3 is connected to each DC substation stabilization control device 2 through communication;

[0039] A primary power grid model, a DC control and protection model and a control and protection interface model are deployed on the simulation device 1; the primary power grid model includes multiple DC power grid simulation models, and the DC control and protection model is used to control the operating status of the DC power grid simulation model; the control and protection interface model is used to realize information interaction between the simulation device 1 and the DC substation stabilization control device 3; the DC power grid simulation model and the DC substation stabilization control device 2 correspond one to one.

[0040] Specifically, a primary power grid model, a DC control and protection model, and a control and protection interface model are deployed on the simulation device 1. Based on the RTDS technology, the primary power grid model can perform real-time digital simulation of the AC power grid and the DC power grid. The primary power grid model can include multiple DC power grid simulation models to realize the simulation of multiple DC power grids. The primary power grid model can also include an AC power grid simulation model to simulate the actual power grid more realistically. The DC control and protection model is used to control the operating state of the DC power grid simulation model, and the operating state includes a normal state or a fault state. In order to carry out the test of multi-DC cross-region power grid stability control, it is necessary to simulate the situation that some DC power grids in multiple DC power grids are in a fault state, and the parameters required for simulating the fault state and normal state of the DC power grid are pre-set and stored in the DC control and protection model. By setting the corresponding test instructions, the DC control and protection model can be triggered to generate a control signal to control the primary power grid model to perform power grid simulation. The control signal includes the parameters required for simulating the fault state and normal state of the DC power grid, so that some DC power grid simulation models in multiple DC power grid simulation models can be controlled to be in a normal state, and some DC power grid simulation models can be controlled to be in a fault state. The primary grid model may include a converter transformer, an AC filter, a DC filter, a smoothing reactor, a neutral bus capacitor, a DC line and a grounding line, etc., which may be configured according to actual needs and are not limited in the embodiment of the present invention. The simulation device 1 may be a server, a workstation, etc.

[0041] The control and protection interface model is used to realize the information interaction between the simulation device and the DC substation stabilization and control device. The control and protection interface model and the control and protection interface unit can replace the actual control and protection device. The control and protection interface model can be constructed according to the interface protocol and timing parameters between the actual stabilization and control device and the actual control and protection device, and the operating status information obtained from each DC power grid simulation model is converted into control and protection status information that can be transmitted through the control and protection interface model. The control and protection status information includes but is not limited to the extreme operation power instruction value, abnormal shutdown signal, speed reduction signal, DC power speed reduction amount, DC speed reduction identification bit, etc. At the same time, the simulation device can also parse the control and protection simulation feedback information returned from each DC substation stabilization and control device through the control and protection interface model. The control and protection simulation feedback information is not limited to information such as modulation strategy, and the modulation strategy may include modulation instruction information such as DC fallback command and DC boost command.

[0042] Each DC substation stabilization and control device 2 can receive the control and protection status information of the corresponding DC power grid simulation model from the simulation device 1 through the control and protection interface unit 4, and receive the electrical quantity information of the corresponding DC power grid simulation model through the sampling unit. According to the received control and protection status information and electrical quantity information, it can be judged whether the corresponding DC power grid simulation model has a fault and the type of fault. Each DC substation stabilization and control device 2 can also calculate the power information based on the received control and protection status information and electrical quantity information and report it to the main station stabilization and control device 3. If the DC power grid simulation model is in a fault state, the power information reported by the corresponding DC substation stabilization and control device 2 is the DC power loss. If the DC power grid simulation model is in a normal state, the power information reported by the corresponding DC substation stabilization and control device 2 is the DC power value.

[0043] When the power information reported by each DC substation stabilization and control device 2 includes the DC power loss amount, the master station stabilization and control device 3 can determine the DC substation stabilization and control device 2 that needs to perform DC modulation and the DC power modulation amount based on the power information reported by each DC substation stabilization and control device 2 and the pre-set modulation strategy table, and send the modulation strategy to the DC substation stabilization and control device 2 that needs to perform DC modulation, wherein the modulation strategy includes the DC power modulation amount.

[0044] After receiving the modulation strategy sent by the main station stabilization and control device 3, the DC substation stabilization and control device 2 will send control and protection simulation feedback information to the simulation device 1 through the control and protection interface unit 4, and the control and protection simulation feedback information may include the modulation strategy. The simulation device 1 performs DC power modulation on the DC power grid simulation model corresponding to each DC substation stabilization and control device 2 according to the modulation strategy returned by each DC substation stabilization and control device 2 and the DC control and protection model, and obtains the modulation result of each DC power grid simulation model. In order to achieve DC power modulation, the DC control and protection model corrects the operating power instruction value of the corresponding DC power grid model through the modulation instruction information included in the control and protection simulation feedback information, so that each DC power grid model to be modulated operates at a new power level, thereby achieving the adjustment of the operating state of the DC power grid simulation model. It can be understood that if the DC substation stabilization and control device 2 does not return the control and protection simulation feedback information or the returned control and protection simulation feedback information is empty, then the DC power modulation will not be performed on the corresponding DC power grid simulation model.

[0045] The simulation device 1 can verify the correctness and effectiveness of the modulation strategy execution of the multi-DC inter-regional power grid stability control system and obtain test results based on the various control and protection simulation feedback information and the modulation results of each DC power grid simulation model.

[0046] The multi-DC cross-regional power grid stability control test system provided by the embodiment of the present invention includes a simulation device, multiple DC substation stability control devices and a master station stability control device. The simulation device is connected to each DC substation stability control device through a control and protection interface unit, and the simulation device uploads electrical quantity information to each DC substation stability control device through a sampling unit; the master station stability control device is connected to each DC substation stability control device through communication; a primary power grid model, a DC control and protection model and a control and protection interface model are deployed on the simulation device; the primary power grid model includes multiple DC power grid simulation models, and the DC control and protection model is used to control the operating state of the DC power grid simulation model; the control and protection interface model is used to realize information interaction between the simulation device and the DC substation stability control device; the DC power grid simulation model corresponds to the DC substation stability control device one by one, and the actual DC control and protection device is replaced by the control and protection interface model and the control and protection interface unit, thereby avoiding the cumbersome testing process caused by the DC control and protection devices belonging to different equipment manufacturers, and improving the testing efficiency.

[0047] On the basis of the above embodiments, the control and protection interface unit 4 further has multiple input and output ports, each of which corresponds to a DC power grid simulation model, and transmits the control and protection state information of the DC power grid simulation model to the DC substation stabilization control device corresponding to the DC power grid simulation model. This can reduce the DC control and protection devices required for carrying out multi-DC cross-region power grid stabilization control tests and save resources.

[0048] On the basis of the above embodiments, the control and protection interface unit 4 further adopts a GTFPGA board card. The GTFPGA board card may have 16 input and output port channels, and may test up to 16 DC power grid simulation models at the same time.

[0049] On the basis of the above embodiments, further, the sampling unit 5 includes a GTAO interface card and a GTDO interface card. The GTAO interface card is used to upload analog quantities, and the GTDO interface card is used to upload digital quantities.

[0050] Figure 2 is a schematic diagram of the structure of a multi-DC cross-regional power grid stability control test system provided by a second embodiment of the present invention, such as Figure 2 As shown, on the basis of the above-mentioned embodiments, further, the multi-DC cross-regional power grid stability control test system provided in the embodiment of the present invention also includes a modeling device 6, which is communicatively connected to the simulation device 1, and the modeling device 6 is used to create the primary power grid model, the DC control and protection model and the control and protection interface model.

[0051] Specifically, the primary power grid model, the DC control and protection model and the control and protection interface model can be created by RSCAD software on the modeling device 6. The modeling device 6 can be connected to the simulation device 1 through a switch. The modeling device 6 can be a desktop computer, a laptop computer, etc.

[0052] Figure 3 FIG. 1 is a flow chart of a multi-DC cross-regional power grid stability control test method provided by a third embodiment of the present invention. Figure 3 As shown, the multi-DC inter-regional power grid stability control test method provided by the embodiment of the present invention is applied to the multi-DC inter-regional power grid stability control test system described in any of the above embodiments, including:

[0053] S301, the simulation device generates a control signal according to the test instruction and the DC control and protection model, and controls the operation of the primary power grid model to generate operation status information and electrical quantity information through the control signal; wherein the primary power grid model includes a DC power grid simulation model in a normal state and a DC power grid simulation model in a fault state during operation;

[0054] Specifically, the test instruction is used to trigger the test, and the simulation device calls the DC control and protection model to generate a control signal according to the test instruction, controls the primary power grid model to perform power grid simulation, and generates operation status information and electrical quantity information. The control signal includes parameters required to simulate the fault state and normal state of the DC power grid, so that some DC power grid simulation models in multiple DC power grid simulation models can be controlled to be in a normal state and some DC power grid simulation models to be in a fault state. The generated operation status information includes the operation status information of each DC power grid simulation model. The generated electrical quantity information includes the electrical quantity information of each DC power grid simulation model.

[0055] S302, the simulation device generates control and protection state information of each DC power grid simulation model according to the operation state information and the control and protection interface model, and obtains electrical quantity information of each DC power grid simulation model according to the electrical quantity information;

[0056] Specifically, the simulation device obtains the operation status information of each DC power grid simulation model from the operation status information, and generates the control and protection status information corresponding to each power grid simulation model according to the operation status information of each DC power grid simulation model and the control and protection interface model. The simulation device can obtain the electrical quantity information of each DC power grid simulation model from the electrical quantity information.

[0057] S303, the simulation device sends the control and protection state information of each DC power grid simulation model to the corresponding DC substation stabilization control device through the control and protection interface unit, and sends the electrical quantity information of each DC power grid simulation model to the corresponding DC substation stabilization control device through the sampling unit;

[0058] Specifically, the simulation device sends the control and protection status information of each DC power grid simulation model to the DC substation stabilization control device corresponding to each DC power grid simulation model through the control and protection interface unit, and sends the electrical quantity information of each DC power grid simulation model to the corresponding DC substation stabilization control device through the sampling unit. Each DC substation stabilization control device can receive the control and protection status information and electrical quantity information of the corresponding DC power grid simulation model.

[0059] S304, the simulation device receives the control and protection simulation feedback information returned by each DC substation stabilization and control device through the control and protection interface unit; wherein the control and protection simulation feedback information includes a modulation strategy; the modulation strategy is received by the DC substation stabilization and control device from the master station stabilization and control device, and is generated and issued by the master station stabilization and control device after receiving the power information reported by each DC substation stabilization and control device and determining that a power shortage occurs; the power information reported by each DC substation stabilization and control device is obtained based on the received control and protection status information and electrical quantity information;

[0060] Specifically, each DC substation stabilization and control device can determine whether the corresponding DC power grid simulation model has a fault and the type of fault based on the control and protection status information and electrical quantity information of the corresponding DC power grid simulation model received. Each DC substation stabilization and control device calculates the power information based on the control and protection status information and electrical quantity information of the corresponding DC power grid simulation model received. If the DC power grid simulation model is in a faulty state, the power information reported by the corresponding DC substation stabilization and control device is the DC power loss. If the DC power grid simulation model is in a normal state, the power information reported by the corresponding DC substation stabilization and control device is the DC power value. Each DC substation stabilization and control device reports the power information to the main station stabilization and control device.

[0061] The main station stabilization control device receives the power information reported by each DC substation stabilization control device. If there is a DC power loss in each power information, the DC substation stabilization control device and the DC power modulation amount that need to be DC modulated can be determined based on the power information reported by each DC substation stabilization control device and the DC modulation rule. Then each DC power modulation amount is carried in the modulation strategy and returned to the corresponding DC substation stabilization control device. Among them, the DC modulation rule is preset.

[0062] Each DC substation stabilization control device can return control and protection simulation feedback information to the simulation device through the control and protection interface unit, and the control and protection simulation feedback information includes a modulation strategy. If the DC substation stabilization control device receives a modulation strategy from the main station stabilization control device, the modulation strategy included in the control and protection simulation feedback information sent will carry the DC power modulation amount. If the DC substation stabilization control device does not receive a modulation strategy from the main station stabilization control device, the modulation strategy included in the control and protection simulation feedback information sent is empty or the control and protection simulation feedback information is not returned to the simulation device.

[0063] For example, the DC modulation rules include: if it is determined that the DC power loss reported by each DC substation stabilization control device is greater than a threshold value, then the total modulation amount is calculated based on the reported DC power loss amount and the DC modulation formula; based on the total modulation amount, the DC power value reported by the DC substation stabilization control device to be modulated, the single DC modulation limit of the DC substation stabilization control device to be modulated, and the total modulation amount limit of the corresponding DC, the DC substation stabilization control device that needs to be DC modulated and the DC power modulation amount are determined; wherein the DC modulation formula is preset, and the DC substation stabilization control device to be modulated refers to the DC substation stabilization control devices other than the faulty DC substation stabilization control device.

[0064] The reported DC power loss is equal to the sum of all the DC power losses. The single DC modulation limit of the DC substation stability control device to be modulated refers to the maximum DC power value that the DC substation stability control device can modulate at one time; the total DC modulation limit of the DC substation stability control device to be modulated refers to the upper limit of the sum of the DC power modulation amounts when the DC substation stability control device performs multiple modulations within the interval between successive faults.

[0065] The priority of each DC substation stabilization control device can be preset, and the DC modulation amount is allocated to the DC substation stabilization control devices to be modulated in sequence according to the order of their priorities until the total modulation amount to be allocated is zero.

[0066] S305, the simulation device performs DC power modulation on the DC power grid simulation model corresponding to each DC substation stabilization control device according to the modulation strategy and DC control and protection model returned by each DC substation stabilization control device, and obtains the modulation result of each DC power grid simulation model;

[0067] Specifically, the simulation device performs DC power modulation on the DC power grid simulation model corresponding to each DC substation stabilization device according to the modulation strategy and DC control and protection model returned by each DC substation stabilization device. If the modulation strategy includes a DC power modulation amount, the DC control and protection model generates a corresponding control signal according to the DC power modulation amount, performs DC power modulation on the corresponding DC power grid simulation model, and obtains the modulation result of the DC power grid simulation model. If the modulation strategy is empty, there is no need to perform DC power modulation on the corresponding DC power grid simulation model. Performing DC power modulation on the DC power grid simulation model will change the operating status information and electrical quantity information of the DC power grid simulation model, and the modulation result of the DC power grid simulation model includes the changed operating status information and electrical quantity information of the DC power grid simulation model.

[0068] S306: The simulation device obtains a test result according to each control and protection simulation feedback information and a modulation result of each DC power grid simulation model.

[0069] Specifically, the simulation device can verify the accuracy and effectiveness of the modulation strategy included in the control and protection simulation feedback information and obtain the test results according to the modulation results of each control and protection simulation feedback information and each DC power grid simulation model. Since the test instruction is pre-set, it is known that the multiple DC power grid simulation models triggered by the test instruction are in a fault state and a normal state, so the modulation strategy to be adopted can be predicted, and the test instruction and the corresponding modulation strategy are pre-stored in the simulation device. The test instruction and the corresponding modulation strategy are compared with the modulation strategy carried by each control and protection simulation feedback information received by the simulation device to determine the accuracy of the modulation strategy. Based on the modulation results of each DC power grid simulation model, it can be determined whether each DC power grid simulation model runs stably after DC modulation. If it runs stably, then the modulation strategy is effective. If it runs unstably, then the modulation strategy needs to be optimized, so that the effectiveness of the modulation strategy can be verified.

[0070] In a multi-DC cross-regional power grid stability control test method provided by an embodiment of the present invention, a simulation device generates a control signal according to a test instruction and a DC control and protection model, and controls the operation of a primary power grid model through the control signal to generate operation status information and electrical quantity information; wherein, the primary power grid model includes a DC power grid simulation model in a normal state and a DC power grid simulation model in a fault state during operation; the simulation device generates the control and protection status information of each DC power grid simulation model according to the operation status information and the control and protection interface model, and obtains the electrical quantity information of each DC power grid simulation model according to the electrical quantity information; the simulation device sends the control and protection status information of each DC power grid simulation model to the corresponding DC substation stability control device through the control and protection interface unit, and sends the electrical quantity information of each DC power grid simulation model to the corresponding DC substation stability control device through the sampling unit; the simulation device receives the control and protection simulation feedback information returned by each DC substation stability control device through the control and protection interface unit; wherein, The control and protection simulation feedback information includes a modulation strategy; the modulation strategy is received by the DC substation stabilization and control device from the main station stabilization and control device, and the main station stabilization and control device generates and issues the modulation strategy of each DC substation after receiving the power information reported by each DC substation stabilization and control device and determining that a power shortage occurs; the power information reported by each DC substation stabilization and control device is obtained based on the received control and protection state information and electrical quantity information; the simulation device performs DC power modulation on the DC power grid simulation model corresponding to each DC substation stabilization and control device according to the modulation strategy returned by each DC substation stabilization and control device and the DC control and protection model, and obtains the modulation result of each DC power grid simulation model; the simulation device obtains the test result according to each control and protection simulation feedback information and the modulation result of each DC power grid simulation model, and replaces the actual DC control and protection device with the control and protection interface model and the control and protection interface unit, avoiding the cumbersome test process caused by the DC control and protection device belonging to different equipment manufacturers, and improving the test efficiency. In addition, the DC control and protection model can verify the effectiveness of the modulation strategy, realize closed-loop testing, and improve the comprehensiveness and reliability of the test.

[0071] On the basis of the above embodiments, further, there are multiple test instructions, and each test instruction corresponds to at least one fault type of the DC power grid.

[0072] Specifically, a plurality of test instructions may be set, and each test instruction is used to trigger at least one fault type of the DC power grid, so that different types of faults of the DC power grid can be tested.

[0073] The following is a specific example to illustrate the implementation process of the multi-DC cross-regional power grid stability control test method provided by the embodiment of the present invention.

[0074] The DC substation in place A, the DC substation in place B and the DC substation in place C are power stations in different regions of the region, and the modulation strategy is issued by the Yinan master station to each of the above DC substations. A multi-DC cross-regional power grid stability control test system is established, including a simulation device, a DC substation stability control device in place A, a DC substation stability control device in place B, a DC substation stability control device in place C, and a Yinan master station stability control device. A primary power grid model is deployed on the simulation device, and the primary power grid model includes a DC power grid simulation model of the DC substation in place A, a DC power grid simulation model of the DC substation in place B and a DC power grid simulation model of the DC substation in place C. A DC control and protection model and a control and protection interface model are deployed on the simulation device. The DC control and protection model is used to control the operating status of the DC power grid simulation model of the DC substation in place A, the DC power grid simulation model of the DC substation in place B and the DC power grid simulation model of the DC substation in place C. The control and protection interface model is used to realize the information interaction between the simulation device and the DC substation stability control device in place A, the DC substation stability control device in place B and the DC substation stability control device in place C.

[0075] The simulation device is connected to the DC substation stability control device at site A, the DC substation stability control device at site B, and the DC substation stability control device at site C through the control and protection interface unit. The control and protection interface unit adopts a GTFPGA board, including three input and output ports, to realize the communication between the DC power grid simulation model and the corresponding DC substation stability control device.

[0076] The simulation device uploads electrical quantity information to the DC substation stabilization and control device at location A, the DC substation stabilization and control device at location B, and the DC substation stabilization and control device at location C respectively through the sampling unit.

[0077] The test instruction X is preset, corresponding to the DC pole II blocking of the DC substation at location A at 0 seconds and the DC pole I blocking of the DC substation at location A at 21 seconds.

[0078] like Figure 4 The specific test process is as follows:

[0079] Step 1: Receive a test instruction. The simulation device receives a test instruction X. The tester can input or select a test instruction on the simulation device.

[0080] The second step is to simulate the power grid. According to the test instruction X, the simulation device calls the DC control and protection model to generate a control signal, and controls the DC power grid simulation model of the DC substation in place A, the DC power grid simulation model of the DC substation in place B, and the DC power grid simulation model of the DC substation in place C to simulate the power grid of each AC substation. Among them, the DC control and protection model pre-sets the simulation parameters required for the DC pole II blocking of the DC substation in place A at 0 seconds, the DC pole I blocking of the DC substation in place A at 21 seconds, and the simulation parameters of the normal state of the DC substation in place A, the DC substation in place B, and the DC substation in place C. The above control signal includes the simulation parameters required for the DC pole II blocking of the DC substation in place A at 0 seconds, the DC pole I blocking of the DC substation in place A at 21 seconds, and the simulation parameters of the normal state of the DC substation in place A, the DC substation in place B, and the DC substation in place C. The DC power grid simulation model of the DC substation in place A will simulate the DC pole II blocking of the DC substation in place A at 0 seconds, and the DC pole I blocking of the DC substation in place A at 21 seconds, two DC power grid fault states. The DC power grid simulation model of the DC substation at Site B and the DC power grid simulation model of the DC substation at Site C will respectively simulate the normal states of the DC power grids.

[0081] Step 3: Get simulation data. During the power grid simulation, the simulation device can obtain operation status information and electrical quantity information, from which the operation status information and electrical quantity information of the three DC power grid simulation models are obtained. Based on the operation status information and control and protection interface model of the DC power grid simulation model, the control and protection status information of each DC power grid simulation model is obtained.

[0082] Step 4: Upload simulation data. The simulation device sends the control and protection status information of the DC grid simulation model of the DC substation in place A to the DC substation stability control device in place A through the GTFPGA board, sends the control and protection status information of the DC grid simulation model of the DC substation in place B to the DC substation stability control device in place B, and sends the control and protection status information of the DC grid simulation model of the DC substation in place C to the DC substation stability control device in place C. The simulation device uploads the electrical quantity information of the DC grid simulation model of the DC substation in place A to the DC substation stability control device in place A through the sampling unit, uploads the electrical quantity information of the DC grid simulation model of the DC substation in place B to the DC substation stability control device in place B, and uploads the electrical quantity information of the DC grid simulation model of the DC substation in place A and place C to the DC substation stability control device in place C.

[0083] Step 5. Calculate power information. Based on the received control and protection status information and electrical quantity information, the DC substation stability control device at site A can first determine the fault type A, and calculate the DC power loss corresponding to fault type A to be 1870MW, and then determine the fault type B, and calculate the DC power loss corresponding to fault type B to be 1750MW; the DC substation stability control device at site A will report the DC power loss corresponding to fault type A and the DC power loss corresponding to fault type B to the Yinan main station stability control device. Yinan main station stability control device Based on the received control and protection status information and electrical quantity information, the DC substation stability control device at site B determines that there is no fault, and calculates the DC power value and reports it to the Yinan main station stability control device. Based on the received control and protection status information and electrical quantity information, the DC substation stability control device at site C determines that there is no fault, and calculates the DC power value and reports it to the Yinan main station stability control device.

[0084] Step 6. Generate a modulation strategy. The Yinan main station stabilization and control device receives the power information reported by the three DC substation stabilization and control devices respectively. Based on the power information reported by each DC substation stabilization and control device and the DC modulation rules, the DC substation stabilization and control device that needs to be DC modulated and the DC power modulation amount can be determined. The Yinan main station stabilization and control device obtains the DC power loss reported by the DC substation stabilization and control device in place A as 1870MW, and compares 1870MW with the DC power threshold of 500MW. Since 1870MW is greater than 500MW, DC power modulation is required. According to the reported DC power loss, the real-time transmission power value and the DC modulation formula, the total modulation amount is calculated. The DC modulation formula is:

[0085] P t = k(P s -P x )

[0086] Among them, P t Indicates the total modulation amount, P s Indicates the reported DC power loss, P x represents the DC power modulation threshold value, and k represents the power change transfer coefficient. k is set according to actual conditions and is not limited in the embodiment of the present invention.

[0087] In order to facilitate data management, data such as coefficients and thresholds can be saved in the Yinan master station strategy table in Table 1 and queried through Table 1 when needed.

[0088] Look up Table 1 to get k is 0.5, P x =500MW.

[0089] From the reported power information, P s =1870MW. Substituting the above data into the DC modulation formula, we can calculate the total modulation amount P under fault type A. tIt is 685MW.

[0090] From the reported power information, P s =1750MW. Substituting the above data into the DC modulation formula, we can calculate the total modulation amount P under fault type B. t It is 625MW.

[0091] Refer to Table 1 for the priority of DC modulation. The DC substation in place A is higher than the DC substation in place C, and the DC substation in place C is higher than the DC substation in place B. t The DC modulation is 685MW, and the DC modulation is performed according to the priority. Since the DC fault of the DC substation in place A is simulated, the DC substation in place A cannot perform DC modulation, and the DC substation in place C is modulated first. The total modulation amount P t The modulation amount of the DC substation in place C is 400MW, which is greater than the single modulation limit of DC in place C of 400MW. The modulation amount of the DC substation in place C is 400MW, and the total modulation amount of the DC substation in place C is less than 1000MW. Then the DC substation in place B is modulated, and the modulation amount to be modulated is 685MW-400MW=285MW. 285MW is less than the single modulation limit of DC in place B of 500MW, and it is assumed that the total modulation amount of the DC substation in place B and the DC substation in place A is less than 900MW. The stabilization control device of the Yinan DC main station will send a modulation strategy to the stabilization control device of the DC substation in place B with a 285MW increase in DC in place B, and send a modulation strategy to the stabilization control device of the DC substation in place C with a 400MW increase in DC in place C.

[0092] Similarly, the total modulation amount P t The power of the DC power plant in Yinan is 625MW. The stabilizing control device of the DC main station in Yinan will send a modulation strategy to the stabilizing control device of the DC substation in B to increase the power of the DC power plant in B by 225MW, and send a modulation strategy to the stabilizing control device of the DC substation in C to increase the power of the DC power plant in C by 400MW.

[0093] Table 1 Yinan master station strategy table

[0094] Serial number Setting name Settings unit 1 Allows modulation of DC 1 - 2 Priority of DC upgrade in Area A 1 - 3 DC boost priority 2 - 4 DC boost priority at site B 3 - 5 DC single modulation limiting 400 MW 6 DC single modulation limiting 500 MW 7 Total DC modulation 1000 MW 8 Total DC modulation of location B + location A 900 MW 9 Total DC modulation refresh time 20 s 10 Total DC modulation amount refresh time of location B + location A 20 s 11 Test DC Continuous Fault Interval Time 20 s 12 DC power threshold 500 MW 134 Power change transfer coefficient k 0.5 -

[0095] Step 7. Return the control and protection simulation feedback information. The DC substation stability control device at site A first returns the control and protection simulation feedback information carrying fault type A to the simulation device through the GTFPGA board; then, it returns the control and protection simulation feedback information carrying fault type B to the simulation device. The DC substation stability control device at site B first returns the control and protection simulation feedback information carrying the modulation strategy to increase the DC power at site B by 285MW to the simulation device through the GTFPGA board; then, it returns the control and protection simulation feedback information carrying the modulation strategy to increase the DC power at site B by 225MW to the simulation device. The DC substation stability control device at site C first returns the control and protection simulation feedback information carrying the modulation strategy to increase the DC power at site C by 400MW to the simulation device through the GTFPGA board; then, it returns the control and protection simulation feedback information carrying the modulation strategy to increase the DC power at site C by 400MW to the simulation device.

[0096] Step 8: Perform DC modulation. The simulation device will call the DC control and protection model to perform DC modulation on the DC grid simulation model of the DC substation at site B according to the modulation strategy returned by the DC substation stabilization device at site B, and call the DC control and protection model to perform DC modulation on the DC grid simulation model of the DC substation at site C according to the modulation strategy returned by the DC substation stabilization device at site C. There is no need to perform DC modulation on the DC grid simulation model of the DC substation at site A. Since two different types of DC fault simulation tests were conducted, two DC modulations were performed respectively.

[0097] Step 9. Obtain the test results. The DC substation stability control device at site A determines whether fault type A is the same as the DC pole II lockout. If they are the same, then the fault type judgment of the DC substation stability control device at site A is correct. Compare the modulation strategy corresponding to fault type A, which increases the DC at site B by 285MW and increases the DC at site C by 400MW, with the pre-set modulation strategy. If they are the same, then the modulation strategy is correct. Based on the modulation results of the DC power grid simulation model of the DC substation at site B and the DC substation at site C, determine whether the constructed DC cross-regional power grid model operates stably after DC modulation. If the simulation model operates stably, then the modulation strategy is effective.

[0098] Similarly, for fault type B, similar judgments will be made, which will not be described in detail here.

[0099] It is understandable that other test instructions may be set to test other DC faults.

[0100] Figure 5 is a schematic diagram of the physical structure of an electronic device provided by a fifth embodiment of the present invention, such as Figure 5As shown, the electronic device may include: a processor 501, a communication interface 502, a memory 503 and a communication bus 504, wherein the processor 501, the communication interface 502 and the memory 503 communicate with each other through the communication bus 504. The processor 501 may call the logic instructions in the memory 503 to execute the following method: generate a control signal according to the test instruction and the DC control and protection model, and control the operation of the primary power grid model to generate operation status information and electrical quantity information through the control signal; wherein the primary power grid model includes a DC power grid simulation model in a normal state and a DC power grid simulation model in a fault state during operation; generate the control and protection status information of each DC power grid simulation model according to the operation status information and the control and protection interface model, and obtain the electrical quantity information of each DC power grid simulation model according to the electrical quantity information; send the control and protection status information of each DC power grid simulation model to the corresponding DC substation stabilization control device through the control and protection interface unit, and send the electrical quantity information of each DC power grid simulation model to the corresponding DC substation stabilization control device through the sampling unit; The interface unit receives the control and protection simulation feedback information returned by each DC substation stabilization and control device; wherein, the control and protection simulation feedback information includes a modulation strategy; the modulation strategy is received by the DC substation stabilization and control device from the main station stabilization and control device, and the main station stabilization and control device generates and issues the modulation strategy of each DC substation after receiving the power information reported by each DC substation stabilization and control device and determining that a power shortage occurs; the power information reported by each DC substation stabilization and control device is obtained based on the received control and protection status information and electrical quantity information; the DC power of the DC power grid simulation model corresponding to each DC substation stabilization and control device is modulated according to the modulation strategy returned by each DC substation stabilization and control device and the DC control and protection model, and the modulation result of each DC power grid simulation model is obtained; the test result is obtained according to each control and protection simulation feedback information and the modulation result of each DC power grid simulation model.

[0101] In addition, the logic instructions in the above-mentioned memory 503 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0102] The present embodiment discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided by the above-mentioned method embodiments, for example, including: generating a control signal according to a test instruction and a DC control and protection model, and controlling the operation of a primary power grid model through the control signal to generate operation status information and electrical quantity information; wherein the primary power grid model includes a DC power grid simulation model in a normal state and a DC power grid simulation model in a fault state during operation; generating the control and protection status information of each DC power grid simulation model according to the operation status information and the control and protection interface model, and obtaining the electrical quantity information of each DC power grid simulation model according to the electrical quantity information; sending the control and protection status information of each DC power grid simulation model to the corresponding DC substation stabilization control device through the control and protection interface unit, and The electrical quantity information of the grid simulation model is sent to the corresponding DC substation stabilization and control device through the sampling unit; the control and protection simulation feedback information returned by each DC substation stabilization and control device is received through the control and protection interface unit; wherein the control and protection simulation feedback information includes a modulation strategy; the modulation strategy is received by the DC substation stabilization and control device from the main station stabilization and control device, and the main station stabilization and control device generates and issues the modulation strategy of each DC substation after receiving the power information reported by each DC substation stabilization and control device and determining that a power shortage occurs; the power information reported by each DC substation stabilization and control device is obtained based on the received control and protection status information and electrical quantity information; the DC power of the DC grid simulation model corresponding to each DC substation stabilization and control device is modulated according to the modulation strategy returned by each DC substation stabilization and control device and the DC control and protection model, and the modulation result of each DC grid simulation model is obtained; the test result is obtained based on each control and protection simulation feedback information and the modulation result of each DC grid simulation model.

[0103] The present embodiment provides a computer-readable storage medium, which stores a computer program, and the computer program enables the computer to execute the methods provided by the above-mentioned method embodiments, for example, including: generating a control signal according to a test instruction and a DC control and protection model, and controlling the operation of a primary power grid model through the control signal to generate operating status information and electrical quantity information; wherein the primary power grid model includes a DC power grid simulation model in a normal state and a DC power grid simulation model in a fault state during operation; generating the control and protection status information of each DC power grid simulation model according to the operating status information and the control and protection interface model, and obtaining the electrical quantity information of each DC power grid simulation model according to the electrical quantity information; sending the control and protection status information of each DC power grid simulation model to the corresponding DC substation stabilization control device through the control and protection interface unit, and sending the electrical quantity information of each DC power grid simulation model to the corresponding DC substation stabilization control device through the sampling unit Send to the corresponding DC substation stabilization and control device; receive the control and protection simulation feedback information returned by each DC substation stabilization and control device through the control and protection interface unit; wherein, the control and protection simulation feedback information includes a modulation strategy; the modulation strategy is received by the DC substation stabilization and control device from the main station stabilization and control device, and the main station stabilization and control device generates and issues the modulation strategy of each DC substation after receiving the power information reported by each DC substation stabilization and control device and determining that a power shortage occurs; the power information reported by each DC substation stabilization and control device is obtained based on the received control and protection status information and electrical quantity information; perform DC power modulation on the DC power grid simulation model corresponding to each DC substation stabilization and control device according to the modulation strategy returned by each DC substation stabilization and control device and the DC control and protection model, and obtain the modulation result of each DC power grid simulation model; obtain the test result based on each control and protection simulation feedback information and the modulation result of each DC power grid simulation model.

[0104] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0105] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0106] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0107] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0108] In the description of this specification, the description with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0109] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-DC cross-regional power grid stability control test system, characterized in that: It includes a simulation device, multiple DC substation stabilization and control devices and a main station stabilization and control device, among which: The simulation device is connected to each DC substation stabilization control device through the control and protection interface unit, and the simulation device uploads electrical quantity information to each DC substation stabilization control device through the sampling unit; the master station stabilization control device is connected to each DC substation stabilization control device through communication; A primary power grid model, a DC control and protection model and a control and protection interface model are deployed on the simulation device; the primary power grid model includes multiple DC power grid simulation models, and the DC control and protection model is used to control the operating status of the DC power grid simulation model; the control and protection interface model is used to realize information interaction between the simulation device and the DC substation stabilization control device; the DC power grid simulation model and the DC substation stabilization control device have a one-to-one correspondence.

2. The multi-DC cross-regional power grid stability control test system according to claim 1 is characterized in that: The control and protection interface unit has multiple input and output ports, and each input and output port corresponds to a DC power grid simulation model.

3. The multi-DC cross-regional power grid stability control test system according to claim 1 is characterized in that: The control and protection interface unit adopts a GTFPGA board.

4. The multi-DC cross-regional power grid stability control test system according to claim 1 is characterized in that: The sampling unit includes a GTAO interface card and a GTDO interface card.

5. The multi-DC cross-regional power grid stability control test system according to any one of claims 1 to 4, characterized in that: It also includes a modeling device, which is communicatively connected with the simulation device, and is used to create the primary power grid model, the DC control and protection model, and the control and protection interface model.

6. A multi-DC cross-regional power grid stability control test method, characterized in that: The multi-DC cross-regional power grid stability control test system applied to any one of claims 1 to 5 comprises: The simulation device generates a control signal according to the test instruction and the DC control and protection model, and controls the operation of the primary power grid model to generate operation status information and electrical quantity information through the control signal; wherein the primary power grid model includes a DC power grid simulation model in a normal state and a DC power grid simulation model in a fault state during operation; The simulation device generates control and protection state information of each DC power grid simulation model according to the operation state information and the control and protection interface model, and obtains electrical quantity information of each DC power grid simulation model according to the electrical quantity information; The simulation device sends the control and protection status information of each DC power grid simulation model to the corresponding DC substation stabilization control device through the control and protection interface unit, and sends the electrical quantity information of each DC power grid simulation model to the corresponding DC substation stabilization control device through the sampling unit; The simulation device receives the control and protection simulation feedback information returned by each DC substation stabilization and control device through the control and protection interface unit; wherein the control and protection simulation feedback information includes a modulation strategy; the modulation strategy is received by the DC substation stabilization and control device from the master station stabilization and control device, and is generated and issued by the master station stabilization and control device after receiving the power information reported by each DC substation stabilization and control device and determining that a power shortage occurs; the power information reported by each DC substation stabilization and control device is obtained based on the received control and protection status information and electrical quantity information; The simulation device performs DC power modulation on the DC power grid simulation model corresponding to each DC substation stabilization control device according to the modulation strategy returned by each DC substation stabilization control device and the DC control and protection model, and obtains the modulation result of each DC power grid simulation model; The simulation device obtains the test result according to each control and protection simulation feedback information and the modulation result of each DC power grid simulation model.

7. The method according to claim 6, characterized in that There are multiple test instructions, and each test instruction corresponds to at least one fault type of the DC power grid.

8. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to claim 6 or 7.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program / instruction, which implements the steps of the method according to claim 6 or 7 when executed by a processor.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to claim 6 or 7 are implemented.

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