New energy station protection setting value automatic verification method and device

Abstract

The invention provides a new energy station protection setting value automatic verification method and device, and relates to the technical field of new energy. The method comprises the steps that a steady-state model is determined, fault points are determined according to the steady-state model, batch fault simulation is carried out on the fault points, and model operation parameters under all faults are obtained; if it is determined that the new energy unit of the steady-state model can be successfully started to the steady state according to the model operation parameters, the model operation parameter variation after batch fault simulation is recorded; and determining constant value verification content according to the model operation parameter variation, determining a protection adaptability analysis program corresponding to the constant value verification content, and performing protection adaptability analysis calculation through the protection adaptability analysis program to obtain a protection adaptability analysis result. The device executes the method. According to the method and the device provided by the embodiment of the invention, the protection setting value of the new energy station can be accurately verified, so that safe operation of new energy delivery is ensured.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a method and device for automatically checking protection constant values of new energy stations. Background Art

[0002] In flexible direct current (HVDC) transmission scenarios, large-scale renewable energy sources are integrated into the flexible direct current (VDC) grid via AC grid-connected lines and then transmitted as an island, a two-terminal weakly fed system. Compared to conventional AC grids, the fault characteristics of these grid-connected lines include limited short-circuit current amplitude, phase control, negative sequence suppression, and waveform distortion, making conventional methods for calculating short-circuit impedance impossible. Furthermore, the post-fault transient duration is long and the fault characteristics uncertain. AC protection typically operates during this transient period, making conventional methods for calculating protection sensitivity based on post-fault steady-state parameters inapplicable.

[0003] With the widespread adoption of modular multilevel (MMC) technology in large-capacity power electronic equipment in low-frequency AC transmission scenarios, research has been conducted on fault ride-through strategies for transient control of M3C power and low-frequency side faults. However, research on the control characteristics of M3C AC converters, such as fault ride-through, is not yet mature. Because fault characteristics are closely related to renewable energy sources and AC converter control characteristics, traditional AC protection is not highly applicable in this scenario.

[0004] Since the transient process of the multi-frequency grid is difficult to express accurately using calculation formulas, it brings many difficulties to the verification of protection settings. It is impossible to accurately verify the protection settings of the AC lines that transmit renewable energy, and it is impossible to ensure the safe operation of renewable energy transmission. Summary of the Invention

[0005] In response to the problems in the prior art, an embodiment of the present invention provides a method and device for automatically checking the protection constant values of a new energy station, which can at least partially solve the problems in the prior art.

[0006] In one aspect, the present invention provides a method for automatically verifying the protection setting value of a new energy station, comprising:

[0007] Determine a steady-state model for fault simulation based on a pre-built multi-frequency convergence system model, determine the fault point based on the steady-state model, and perform batch fault simulation on the fault point to obtain model operating parameters under all faults;

[0008] If it is determined according to the model operating parameters that the new energy generator set of the steady-state model can be successfully started to a steady state, then a change in the model operating parameters after batch fault simulation is recorded;

[0009] Determine the fixed - value verification content according to the change amount of the model operation parameters, determine the protection adaptability analysis program corresponding to the fixed - value verification content, and perform protection adaptability analysis calculation through the protection adaptability analysis program to obtain the protection adaptability analysis result.

[0010] Among them, the method for determining the steady - state model for fault simulation according to the pre - established multi - frequency aggregation system model includes:

[0011] Determine the control mode according to the multi - frequency aggregation system model, and determine multiple model operation modes according to the control mode;

[0012] Simulate single - phase solid - grounding faults for each model operation mode respectively, and select the steady - state condition corresponding to the model operation mode with the minimum steady - state short - circuit current as the steady - state model.

[0013] Among them, the method for automatic verification of new - energy power station protection fixed - values further includes:

[0014] If the new - energy units of the steady - state model can be successfully started to the steady - state according to the model operation parameters, obtain the recorded data of the change amount of the model operation parameters in the preset time period before the batch fault simulation, and record the change amount of the model operation parameters after the batch fault simulation.

[0015] Among them, determine the model parameters according to the multi - frequency aggregation system model; correspondingly, the method for automatic verification of new - energy power station protection fixed - values further includes:

[0016] If the new - energy units of the steady - state model cannot be successfully started to the steady - state according to the model operation parameters, rebuild the multi - frequency aggregation system model by adjusting the model parameters, and execute the steps of determining the steady - state model for fault simulation according to the rebuilt multi - frequency aggregation system model and subsequent steps.

[0017] Among them, the determining the fixed - value verification content according to the change amount of the model operation parameters includes:

[0018] Read the change amount of the model operation parameters in parallel batches, perform fixed - value verification in real - time according to the change amount of the model operation parameters read in parallel batches, and select the fixed - value verification content according to the fixed - value verification result.

[0019] Among them, the determining the protection adaptability analysis program corresponding to the fixed - value verification content and performing protection adaptability analysis calculation through the protection adaptability analysis program to obtain the protection adaptability analysis result includes:

[0020] If it is determined according to the calculation result that the protection adaptability does not meet the preset requirements, modify the protection setting value, and execute the steps of determining the setting value verification content and subsequent steps according to the change amount of the model operation parameters.

[0021] On the one hand, the present invention provides a device for automatically verifying protection setting values of a new energy power station, including:

[0022] An acquisition unit, configured to determine a steady-state model for fault simulation according to a pre-established multi-frequency aggregation system model, determine a fault point according to the steady-state model, and perform batch fault simulations for the fault point to obtain model operation parameters under all faults;

[0023] A determination unit, configured to record the change amount of the model operation parameters after batch fault simulation if the new energy units of the steady-state model can be successfully started to the steady state according to the model operation parameters;

[0024] A verification unit, configured to determine the setting value verification content according to the change amount of the model operation parameters, determine a protection adaptability analysis program corresponding to the setting value verification content, and perform protection adaptability analysis calculations through the protection adaptability analysis program to obtain a protection adaptability analysis result.

[0025] On the other hand, an embodiment of the present invention provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the following method is implemented:

[0026] Determine a steady-state model for fault simulation according to a pre-established multi-frequency aggregation system model, determine a fault point according to the steady-state model, and perform batch fault simulations for the fault point to obtain model operation parameters under all faults;

[0027] If it is determined according to the model operation parameters that the new energy units of the steady-state model can be successfully started to the steady state, record the change amount of the model operation parameters after batch fault simulation;

[0028] Determine the setting value verification content according to the change amount of the model operation parameters, determine a protection adaptability analysis program corresponding to the setting value verification content, and perform protection adaptability analysis calculations through the protection adaptability analysis program to obtain a protection adaptability analysis result.

[0029] An embodiment of the present invention provides a computer-readable storage medium, including:

[0030] The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following method is implemented:

[0031] Determine a steady-state model for fault simulation according to a pre-established multi-frequency aggregation system model, determine a fault point according to the steady-state model, and perform batch fault simulations for the fault point to obtain model operation parameters under all faults;

[0032] If it is determined according to the model operation parameters that the new energy units of the steady-state model can be successfully started to the steady state, record the change amount of the model operation parameters after the batch fault simulation;

[0033] Determine the fixed value verification content according to the change amount of the model operation parameters, determine the protection adaptability analysis program corresponding to the fixed value verification content, and perform protection adaptability analysis calculations through the protection adaptability analysis program to obtain the protection adaptability analysis result.

[0034] An embodiment of the present invention also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the following method is implemented:

[0035] Determine a steady-state model for fault simulation according to a pre-established multi-frequency aggregation system model, determine a fault point according to the steady-state model, and perform batch fault simulations for the fault point to obtain model operation parameters under all faults;

[0036] If it is determined according to the model operation parameters that the new energy units of the steady-state model can be successfully started to the steady state, record the change amount of the model operation parameters after the batch fault simulation;

[0037] Determine the fixed value verification content according to the change amount of the model operation parameters, determine the protection adaptability analysis program corresponding to the fixed value verification content, and perform protection adaptability analysis calculations through the protection adaptability analysis program to obtain the protection adaptability analysis result.

[0038] The method and device for automatically verifying the protection setting values of a new energy power station provided by the embodiment of the present invention determine a steady-state model for fault simulation according to a pre-established multi-frequency aggregation system model, determine a fault point according to the steady-state model, and perform batch fault simulations for the fault point to obtain model operation parameters under all faults; if it is determined according to the model operation parameters that the new energy units of the steady-state model can be successfully started to the steady state, record the change amount of the model operation parameters after the batch fault simulation; determine the fixed value verification content according to the change amount of the model operation parameters, determine the protection adaptability analysis program corresponding to the fixed value verification content, and perform protection adaptability analysis calculations through the protection adaptability analysis program to obtain the protection adaptability analysis result, which can accurately verify the protection setting values of the new energy power station, thereby ensuring the safe operation of new energy transmission. Description of the Drawings

[0039] 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 also be obtained based on these drawings. In the drawings:

[0040] Figure 1 It is a schematic flowchart of the protection setting value verification method in the prior art.

[0041] Figure 2 It is a basic architecture diagram of a multi-frequency aggregation system based on real-time digital simulation provided by an embodiment of the present invention.

[0042] Figure 3 It is a schematic flowchart of the new energy power station protection setting value automatic verification method provided by an embodiment of the present invention.

[0043] Figure 4 It is a schematic flowchart of the new energy power station protection setting value automatic verification method provided by another embodiment of the present invention.

[0044] Figure 5 It is a schematic structural diagram of the new energy power station protection setting value automatic verification device provided by an embodiment of the present invention.

[0045] Figure 6 It is a schematic physical structure diagram of the computer device provided by the embodiment of the present invention. Specific embodiments

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer and more understandable, the following will further elaborate on the embodiments of the present invention in conjunction with the drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but not to limit the present invention. It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined arbitrarily with each other.

[0047] Explanation of related terms:

[0048] Flexible DC transmission: Abbreviated as flexible DC power transmission, it is a DC power transmission technology based on voltage source converters, self-turn-off devices, and pulse width modulation (PWM) technology. This power transmission technology has the advantages of being able to supply power to passive networks, not having commutation failures, not requiring communication between converter stations, and being easy to form a multi-terminal DC system.

[0049] Low-frequency power transmission: A new generation of power transmission technology between 0 - 50 Hz with a flexible AC / AC converter based on fully controlled power electronic devices as the core component and pulse width modulation as the theoretical basis.

[0050] Relay protection adaptability: Adaptability means that the settings and principles of relay protection devices can adapt to different power system structures, operating conditions (such as load changes, system oscillations, unbalanced three-phase operation, network structure changes, various interferences and impacts, etc.) and corresponding fault natures, types, and locations, etc., to meet the protection requirements in different situations.

[0051] As Figure 1 shown, by building a substation and line model including wind turbines and photovoltaic in a power system real-time simulation device, and according to the simulation results, protection principles, and calculated settings, the system protection scheme design and result verification are completed.

[0052] The specific simulation calculation steps are as follows:

[0053] (1) Establish a primary grid model and adjust the grid model parameters according to the computing power of the computing resources and the actual characteristics of the system.

[0054] (2) Improve the line model connected to the power system and set the fault points, conduct fault simulation, and obtain the system fault simulation data.

[0055] (3) According to the protection principle, determine the phase selection and protection configuration scheme, and verify protection methods such as distance protection and differential protection for the simulation results to judge whether they can accurately operate and meet the four requirements of protection.

[0056] The following defects exist in the above method:

[0057] (1) In terms of protection setting verification, the research on low-frequency / flexible DC transmission mainly focuses on fault characteristics, and its main idea is to establish an equivalent calculation model for analysis and simulation. Existing research has proposed simplified analysis and calculation methods for the fault characteristics of different types of new energy power sources, but there are simplifications of the actual model, and the fault transient characteristics of large-scale new energy power sources are approximately processed. The protection setting verification carried out based on this still needs further exploration in terms of transient characteristics.

[0058] (2) Under the condition that large-scale new energy is connected to the main grid through AC collection, the control strategies of grid-connected inverters / converters have a great impact on the amplitude, phase angle, and frequency of power frequency fault currents, resulting in situations that affect the operation of protection. Relevant existing research has not yet been carried out in large-scale engineering practice, and most of them have expanded the protection operation conditions. The operation situations are relatively conservative and cannot achieve batch verification of multiple fault conditions. In essence, the method still belongs to traditional AC protection.

[0059] As Figure 2As shown in the figure, there are mainly various frequencies of electricity in the basic architecture of the multi-frequency aggregation system, such as low-frequency, power-frequency, and DC. New energy from different regions is respectively aggregated through flexible DC / low-frequency power transmission and then connected to the AC main grid. Among them, the phase between the power-frequency and low-frequency can be independently controlled to achieve the AC asynchronous interconnection between power-frequency power grids and solve the problem of power angle stability across provinces / regions. Combining power control can achieve power source support such as frequency and voltage.

[0060] Figure 3 It is a schematic flowchart of the method for automatically verifying the protection setting values of a new energy power station provided by an embodiment of the present invention. As Figure 3 shown, the method for automatically verifying the protection setting values of a new energy power station provided by the embodiment of the present invention includes:

[0061] Step S1: Determine the steady-state model for fault simulation according to the pre-built multi-frequency aggregation system model, determine the fault point according to the steady-state model, and perform batch fault simulations for the fault point to obtain the model operation parameters under all faults.

[0062] Step S2: If it is determined according to the model operation parameters that the new energy units of the steady-state model can be successfully started to the steady state, record the change amount of the model operation parameters after the batch fault simulation.

[0063] Step S3: Determine the setting value verification content according to the change amount of the model operation parameters, determine the protection adaptability analysis program corresponding to the setting value verification content, and perform protection adaptability analysis calculations through the protection adaptability analysis program to obtain the protection adaptability analysis results.

[0064] In the above step S1, the device determines the steady-state model for fault simulation according to the pre-built multi-frequency aggregation system model, determines the fault point according to the steady-state model, and performs batch fault simulations for the fault point to obtain the model operation parameters under all faults. The device can be a computer device that executes this method. In the technical solution of this application, the acquisition, storage, use, processing, etc. of data all comply with relevant regulations.

[0065] The multi-frequency aggregation system model can be built according to the basic architecture of the multi-frequency aggregation system as Figure 2 shown. Specifically, a multi-frequency aggregation system model containing wind turbines, photovoltaics, flexible DC transmission lines and rectifiers / inverters, low-frequency transmission lines and converters, aggregation lines, and AC infinite buses is built.

[0066] The fault points can include the first type of fault points and the second type of fault points. The determination method includes:

[0067] Run the steady-state model, determine the line bus voltage accessed by the new energy power station and the voltage levels of the high and low voltage sides of the main transformer in the station, and confirm that they meet the requirements as Figure 2After the basic voltage level of the multi - frequency aggregation system is shown, select the measurement points on the new - energy side, the mid - point, the substation side in the line area, and the out - of - area measurement points on both sides of the line as the first - type fault points, and select the high - voltage side, low - voltage side, and low - voltage bus of the substation main transformer as the second - type fault points.

[0068] Perform batch fault simulations for the above - mentioned fault points to obtain the model operation parameters under all faults, which are described as follows:

[0069] Execute batch fault simulations including single - phase solid - earth fault, two - phase short - circuit, two - phase short - circuit to earth, and three - phase short - circuit to earth for the above - mentioned fault points, and obtain the line and main - transformer voltage and current data, the active power output levels of wind turbines and photovoltaic systems, the AC / DC voltages at the sending and receiving ends, etc. under all faults.

[0070] The steady - state model used for fault simulation is determined according to the pre - built multi - frequency aggregation system model, including:

[0071] Determine the control mode according to the multi - frequency aggregation system model, and determine multiple model operation modes according to the control mode. The determination of the control mode is described as follows:

[0072] To determine the control mode according to the multi - frequency aggregation system model, it is necessary to comprehensively consider the frequency - response characteristics and control requirements of the system, and select appropriate control algorithms and parameters. The following is a detailed explanation of this process:

[0073] First, it is necessary to clarify the frequency - response characteristics of the multi - frequency aggregation system model. This usually includes the amplitude - frequency characteristics and phase - frequency characteristics of the system, which can be analyzed through graphical representation methods such as the Bode Plot. The Bode Plot can show the gain and phase changes of the system at different frequencies, thus helping to understand the stability and performance of the system.

[0074] Secondly, according to the frequency - response characteristics and control requirements of the system, select appropriate control algorithms. For example, in occasions where fast response is required, high - frequency control algorithms can be selected; in occasions where stable output is required, low - frequency control algorithms can be selected. In addition, control strategies such as series lead compensation, series lag compensation, lag - lead compensation, and PID compensation can also be considered to improve the performance of the system.

[0075] Finally, according to the selected control algorithm, determine appropriate control parameters. This includes parameters such as the gain and phase compensation of the controller, and these parameters need to be adjusted and optimized according to the actual situation of the system. By adjusting the control parameters, the frequency - response of the system can be changed to meet specific performance requirements.

[0076] The determination of multiple model operation modes according to the control mode is described as follows:

[0077] The influence of the flexible DC monopole / dipole operation on the system transmission capacity and system power flow can be determined according to the control mode, and multiple model operation modes can be determined based on the above influence. For example, multiple model operation modes include the flexible DC monopole operation mode and the flexible DC dipole operation mode.

[0078] For each model operation mode, a single-phase metallic grounding fault is simulated respectively, and the steady-state condition corresponding to the model operation mode with the minimum steady-state short-circuit current is selected as the steady-state model. Taking the above flexible DC monopole operation mode and flexible DC dipole operation mode as an example, if the steady-state short-circuit current of the flexible DC monopole operation mode is less than that of the flexible DC dipole operation mode, the steady-state condition of the flexible DC monopole operation mode is selected as the steady-state model, and the subsequent steps are all carried out for the steady-state model.

[0079] In the above step S2, if the device determines that the new energy unit of the steady-state model can be successfully started to the steady state according to the model operation parameters, the change amount of the model operation parameters after the batch fault simulation is recorded. As Figure 2 shown, the new energy unit can include a wind turbine unit or a photovoltaic unit.

[0080] The automatic verification method for the protection setting value of the new energy substation also includes:

[0081] If it is determined according to the model operation parameters that the new energy unit of the steady-state model can be successfully started to the steady state, the recorded data of the change amount of the model operation parameters in the preset time period before the batch fault simulation is carried out is obtained, and the change amount of the model operation parameters after the batch fault simulation is recorded.

[0082] The specific description is as follows:

[0083] According to the line and main transformer voltage and current data, the active power output levels of the wind turbines and photovoltaics, the AC / DC voltages at the sending and receiving ends and other data under all faults, it is determined whether the new energy unit can be successfully started to the steady state before the batch fault simulation. As Figure 4 shown, if it is yes, the change amount of the model operation parameters after the batch fault simulation is recorded.

[0084] Furthermore, if it is yes, the recorded data of the change amount of the model operation parameters in the preset time period before the batch fault simulation is carried out is obtained, and the change amount of the model operation parameters after the batch fault simulation is recorded. The preset time period can be set independently according to the actual situation, and can be selected as 100 ms, that is, the waveform is recorded starting from 100 ms before the fault, and the change process of each parameter after the fault is recorded. The function of recording the waveform starting from 100 ms before the fault is to obtain the change amount of the model operation parameters after the batch fault simulation completely.

[0085] The model parameters are determined according to the multi-frequency aggregation system model; correspondingly, the automatic verification method for the protection setting value of the new energy substation also includes:

[0086] If the new energy unit of the steady-state model cannot be successfully started to the steady state according to the model operation parameters, the multi-frequency aggregation system model is rebuilt by adjusting the model parameters, and the steady-state model for fault simulation and subsequent steps are determined according to the rebuilt multi-frequency aggregation system model. The model parameters may include new energy models such as Figure 2 the wind turbines and photovoltaic shown, and the structural components of the basic architecture of the multi-frequency aggregation system. Whether the basic architecture of the multi-frequency aggregation system is correct can be determined according to the above structural components and the connection relationships between the structural components.

[0087] Adjusting the model parameters may specifically include adjusting one or more of the new energy model type, structural components, and some connection relationships to achieve the purpose of verifying whether the basic architecture of the multi-frequency aggregation system is correct.

[0088] Such as Figure 4 shown, according to the line and main transformer voltage and current data, wind turbine and photovoltaic active power output levels, sending and receiving end AC / DC voltage and other data under all faults, it is determined whether the new energy unit can be successfully started to the steady state before batch fault simulation. If not, the multi-frequency aggregation system model is rebuilt by adjusting the model parameters, and the steady-state model for fault simulation and subsequent steps are determined according to the rebuilt multi-frequency aggregation system model.

[0089] The change amount of the model operation parameters after batch fault simulation may specifically be the real-time values of the voltage data and current data of the measurement points corresponding to the line faults.

[0090] In the above step S3, the device determines the fixed value verification content according to the change amount of the model operation parameters, determines the protection adaptability analysis program corresponding to the fixed value verification content, and performs protection adaptability analysis calculation through the protection adaptability analysis program to obtain the protection adaptability analysis result.

[0091] Determining the fixed value verification content according to the change amount of the model operation parameters includes:

[0092] Parallel batch reading of the change amount of the model operation parameters, real-time fixed value verification according to the parallel batch read change amount of the model operation parameters, and selection of the fixed value verification content according to the fixed value verification result. The change amount of the model operation parameters can be parallel batch read according to the preset parallel batch read parameters. The above parallel batch read parameters can be set independently according to the actual situation. For example, to meet the requirement of processing 20 files in the same batch, the single-channel readable data volume meets 10,000 points.

[0093] By parallel batch reading of the changes in the model operation parameters, the efficiency of setting verification can be improved. By parallel batch reading of the changes in the model operation parameters according to the preset parallel batch reading parameters, on the basis of improving the efficiency of setting verification, flexible and autonomous control of improving the efficiency of setting verification can be further realized.

[0094] The setting verification method can be realized through programming, and the above program can be solidified in the setting verification system; correspondingly, the changes in the model operation parameters after batch fault simulation can be input into the setting verification system, and the setting verification result can be obtained through the setting verification system, and the setting verification content can be selected according to the setting verification result. The setting verification content specifically includes line protection verification, bus protection verification, transformer differential protection verification, and breaker failure protection verification.

[0095] Taking the line protection verification as an example, the secondary classification of the line protection verification is "line differential protection sensitivity verification", "line differential protection action coefficient verification", and "analysis of current phase angle difference on both sides of the line", and the tertiary classification can be selected according to the setting verification of equipment from different manufacturers.

[0096] Such as Figure 4 As shown, line protection verification can be selected, and then "line differential protection sensitivity verification", "line differential protection action coefficient verification", "analysis of current phase angle difference on both sides of the line", and the corresponding tertiary classification can be selected. Then bus protection verification can be selected, and the corresponding secondary classification and tertiary classification of the bus protection verification can be selected, and so on, until the breaker failure protection verification and its corresponding secondary classification and tertiary classification are traversed.

[0097] Referring to the above description, the protection adaptability analysis program can correspond to the secondary classification and tertiary classification respectively corresponding to the above line protection verification, bus protection verification, transformer differential protection verification, and breaker failure protection verification.

[0098] Determining the protection adaptability analysis program corresponding to the setting verification content, and performing protection adaptability analysis calculation through the protection adaptability analysis program to obtain the protection adaptability analysis result, including:

[0099] If it is determined according to the calculation result that the protection adaptability does not meet the preset requirements, the protection setting is modified, and the above steps of determining the setting verification content according to the changes in the model operation parameters and subsequent steps are executed. The preset requirements can be set autonomously according to the actual situation. The protection setting can be understood as the custom parameter of the protection setting for the automatic verification of the new energy power station protection, which can be set autonomously in advance according to the actual situation. Modifying the protection setting will affect the protection adaptability analysis result obtained by performing protection adaptability analysis calculation through the protection adaptability analysis program.

[0100] The method for automatically verifying the protection setting values of the new energy power station also includes:

[0101] If it is determined according to the calculation results that the protection adaptability meets the preset requirements, the current calculation results are determined as the final protection adaptability analysis results.

[0102] As Figure 4 shown, the method for automatically verifying the protection setting values of the new energy power station provided by the embodiment of the present invention is further described as follows:

[0103] Step 1: Build a multi-frequency aggregation system model containing wind turbines, photovoltaics, flexible DC transmission lines and rectifiers / inverters, low-frequency transmission lines and converters, collector lines, and AC infinite buses. Analyze the calculation results based on the multi-frequency aggregation system model to determine the model parameters and control modes of the multi-frequency aggregation system model; determine the influence degree of the single / double-pole operation of the flexible DC on the system transmission capacity and system power flow according to the control mode, and determine multiple model operation modes according to the influence degree.

[0104] Step 2: Simulate single-phase metallic grounding faults for the model under multiple model operation modes respectively, and select the operating conditions at steady state of the operation mode with the minimum steady-state short-circuit current as the steady-state model for subsequent fault simulation (corresponding to Figure 4 the steady-state basic model in

[0105] Step 3: Run the steady-state model, confirm the line bus voltage connected to the new energy power station and the voltage levels of the high and low voltage sides of the main transformer in the station. After confirming that they meet the basic voltage level of the system, select the measuring points on the new energy side, midpoint, station side of the line and the off-site measuring points on both sides of the line as the first type of fault points, and select the high voltage side, low voltage side and low voltage bus of the station main transformer as the second type of fault points. Execute batch fault simulations including single-phase metallic grounding, two-phase short circuit, two-phase short circuit grounding, and three-phase short circuit grounding for the above fault points, and obtain the line and main transformer voltage and current data, the active power output levels of wind turbines and photovoltaics, the AC / DC voltages at the sending and receiving ends, etc. under all faults.

[0106] Step 4: Based on the data obtained in Step 3, judge whether the system successfully starts to steady state before the fault, that is, whether the wind turbine or photovoltaic unit starts smoothly and operates stably; if it cannot start to steady state successfully, modify and adjust the model parameters in Step 1.

[0107] Step 5: If it can start to steady state successfully, start recording waveforms from 100 ms before the fault and record the change amounts of the model operation parameters after the batch fault simulation.

[0108] Step 6: Use the change amounts of the model operation parameters as the initial input to the setting value verification system.

[0109] Step 7: Read the changes in model operation parameters in parallel in batches, meeting the requirement of processing 20 files in the same batch, and the data volume that can be read in a single channel meets 10,000 points.

[0110] Step 8: Select the content of setting value verification in the setting value verification system, including: line protection verification, bus protection verification, transformer differential protection verification, and breaker failure protection verification. If line protection verification is selected, the secondary classification of the line protection verification system is "sensitivity verification of line differential protection", "action coefficient verification of line differential protection", "analysis of current phase angle difference on both sides of the line", and the tertiary classification is the selection of setting value verification for devices of different manufacturers, and so on to traverse all the content of setting value verification.

[0111] Step 9: According to the system selection in Step 8, read the corresponding protection adaptability analysis program for calculation. If it is determined according to the calculation result that the protection adaptability meets the preset requirements, then determine the current calculation result as the final protection adaptability analysis result. If it is determined according to the calculation result that the protection adaptability does not meet the preset requirements, then modify the protection setting value and execute Step 6.

[0112] The method for automatically verifying the protection setting value of a new energy power station provided by the embodiment of the present invention determines a steady-state model for fault simulation according to a pre-built multi-frequency aggregation system model, determines a fault point according to the steady-state model, and performs batch fault simulations for the fault point to obtain the model operation parameters under all faults; if it is determined according to the model operation parameters that the new energy units of the steady-state model can be successfully started to the steady state, then record the changes in the model operation parameters after the batch fault simulation; determine the content of setting value verification according to the changes in the model operation parameters, determine the protection adaptability analysis program corresponding to the content of setting value verification, and perform protection adaptability analysis calculation through the protection adaptability analysis program to obtain the protection adaptability analysis result, which can realize accurate verification of the protection setting value of the new energy power station, thereby ensuring the safe operation of new energy transmission.

[0113] Further, the determining a steady-state model for fault simulation according to a pre-built multi-frequency aggregation system model includes:

[0114] Determine the control mode according to the multi-frequency aggregation system model, and determine multiple model operation modes according to the control mode; it can be described with reference to the above embodiments and will not be elaborated.

[0115] Simulate a single-phase metallic ground fault for each model operation mode respectively, and select the steady-state condition corresponding to the model operation mode with the minimum steady-state short-circuit current as the steady-state model. It can be described with reference to the above embodiments and will not be elaborated.

[0116] Further, the method for automatically verifying the protection setting value of the new energy power station further includes:

[0117] If it is determined according to the model operation parameters that the new energy unit of the steady-state model can be successfully started to the steady state, record data of the change amount of the model operation parameters in a preset time period before the batch fault simulation moment is obtained, and the change amount of the model operation parameters after the batch fault simulation is recorded. It can be described with reference to the above embodiments and will not be repeated.

[0118] Further, model parameters are determined according to the multi-frequency aggregation system model; correspondingly, the new energy substation protection setting value automatic verification method further includes:

[0119] If it is determined according to the model operation parameters that the new energy unit of the steady-state model fails to be successfully started to the steady state, the multi-frequency aggregation system model is rebuilt by adjusting the model parameters, and the steady-state model for fault simulation and subsequent steps are determined according to the rebuilt multi-frequency aggregation system model. It can be described with reference to the above embodiments and will not be repeated.

[0120] Further, determining the setting value verification content according to the change amount of the model operation parameters includes:

[0121] The change amounts of the model operation parameters are read in parallel in batches, the setting value verification is performed in real time according to the change amounts of the model operation parameters read in parallel in batches, and the setting value verification content is selected according to the setting value verification result. It can be described with reference to the above embodiments and will not be repeated.

[0122] Further, determining the protection adaptability analysis program corresponding to the setting value verification content, and performing protection adaptability analysis calculation through the protection adaptability analysis program to obtain a protection adaptability analysis result includes:

[0123] If it is determined according to the calculation result that the protection adaptability does not meet the preset requirements, the protection setting value is modified, and the step of determining the setting value verification content according to the change amount of the model operation parameters and subsequent steps are executed. It can be described with reference to the above embodiments and will not be repeated.

[0124] Figure 5 It is a structural schematic diagram of a new energy substation protection setting value automatic verification device provided by an embodiment of the present invention. As Figure 5 shown, the new energy substation protection setting value automatic verification device provided by the embodiment of the present invention includes an acquisition unit 501, a determination unit 502, and a verification unit 503, where:

[0125] The acquisition unit 501 is used to determine a steady-state model for fault simulation according to a pre-established multi-frequency aggregation system model, determine a fault point according to the steady-state model, and perform batch fault simulations for the fault point to obtain model operation parameters under all faults; the determination unit 502 is used to record the change amount of the model operation parameters after the batch fault simulation if the new energy unit of the steady-state model can be successfully started to the steady state according to the model operation parameters; the verification unit 503 is used to determine the fixed value verification content according to the change amount of the model operation parameters, determine a protection adaptability analysis program corresponding to the fixed value verification content, and perform protection adaptability analysis calculations through the protection adaptability analysis program to obtain a protection adaptability analysis result.

[0126] Specifically, the acquisition unit 501 in the device is used to determine a steady-state model for fault simulation according to a pre-established multi-frequency aggregation system model, determine a fault point according to the steady-state model, and perform batch fault simulations for the fault point to obtain model operation parameters under all faults; the determination unit 502 is used to record the change amount of the model operation parameters after the batch fault simulation if the new energy unit of the steady-state model can be successfully started to the steady state according to the model operation parameters; the verification unit 503 is used to determine the fixed value verification content according to the change amount of the model operation parameters, determine a protection adaptability analysis program corresponding to the fixed value verification content, and perform protection adaptability analysis calculations through the protection adaptability analysis program to obtain a protection adaptability analysis result.

[0127] The new energy station protection setting value automatic verification device provided by the embodiment of the present invention determines a steady-state model for fault simulation according to a pre-established multi-frequency aggregation system model, determines a fault point according to the steady-state model, and performs batch fault simulations for the fault point to obtain model operation parameters under all faults; if the new energy unit of the steady-state model can be successfully started to the steady state according to the model operation parameters, record the change amount of the model operation parameters after the batch fault simulation; determine the fixed value verification content according to the change amount of the model operation parameters, determine a protection adaptability analysis program corresponding to the fixed value verification content, and perform protection adaptability analysis calculations through the protection adaptability analysis program to obtain a protection adaptability analysis result, which can accurately verify the protection setting value of the new energy station, thereby ensuring the safe operation of new energy transmission.

[0128] Further, the acquisition unit 501 is specifically used for:

[0129] Determine a control mode according to the multi-frequency aggregation system model, and determine multiple model operation modes according to the control mode;

[0130] For each model operation mode, a single-phase metallic grounding fault is simulated respectively, and the steady-state condition corresponding to the model operation mode with the minimum steady-state short-circuit current is selected as the steady-state model.

[0131] Further, the new energy power station protection setting value automatic verification device is also used for:

[0132] If it is determined according to the model operation parameters that the new energy units of the steady-state model can be successfully started to the steady state, record data of the change amount of the model operation parameters in a preset time period before the batch fault simulation is performed, and record the change amount of the model operation parameters after the batch fault simulation.

[0133] Further, model parameters are determined according to the multi-frequency aggregation system model; correspondingly, the new energy power station protection setting value automatic verification device is also used for:

[0134] If it is determined according to the model operation parameters that the new energy units of the steady-state model cannot be successfully started to the steady state, rebuild the multi-frequency aggregation system model by adjusting the model parameters, and execute the steps of determining the steady-state model for fault simulation according to the rebuilt multi-frequency aggregation system model and subsequent steps.

[0135] Further, the verification unit 503 is specifically used for:

[0136] Read the change amount of the model operation parameters in parallel in batches, perform setting value verification in real time according to the change amount of the model operation parameters read in parallel in batches, and select the setting value verification content according to the setting value verification result.

[0137] Further, the verification unit 503 is specifically used for:

[0138] If it is determined according to the calculation result that the protection adaptability does not meet the preset requirements, modify the protection setting value, and execute the steps of determining the setting value verification content according to the change amount of the model operation parameters and subsequent steps.

[0139] The embodiments of the new energy power station protection setting value automatic verification device provided by the embodiments of the present invention can specifically be used to execute the processing procedures of the above method embodiments, and its functions will not be elaborated here, and reference can be made to the detailed descriptions of the above method embodiments.

[0140] Figure 6 It is a schematic diagram of the physical structure of the computer device provided by the embodiments of the present invention. As Figure 6 shown, the computer device includes: a memory 601, a processor 602, and a computer program stored on the memory 601 and executable on the processor 602. When the processor 602 executes the computer program, the following method is implemented:

[0141] Determine a steady-state model for fault simulation according to a pre-established multi-frequency aggregation system model, determine a fault point based on the steady-state model, and perform batch fault simulations for the fault point to obtain model operation parameters under all faults;

[0142] If it is determined according to the model operation parameters that the new energy units of the steady-state model can be successfully started to the steady state, record the change amount of the model operation parameters after batch fault simulation;

[0143] Determine the setting verification content according to the change amount of the model operation parameters, determine the protection adaptability analysis program corresponding to the setting verification content, and perform protection adaptability analysis calculations through the protection adaptability analysis program to obtain the protection adaptability analysis result.

[0144] This embodiment discloses a computer program product, which includes a computer program. When the computer program is executed by a processor, the following method is implemented:

[0145] Determine a steady-state model for fault simulation according to a pre-established multi-frequency aggregation system model, determine a fault point based on the steady-state model, and perform batch fault simulations for the fault point to obtain model operation parameters under all faults;

[0146] If it is determined according to the model operation parameters that the new energy units of the steady-state model can be successfully started to the steady state, record the change amount of the model operation parameters after batch fault simulation;

[0147] Determine the setting verification content according to the change amount of the model operation parameters, determine the protection adaptability analysis program corresponding to the setting verification content, and perform protection adaptability analysis calculations through the protection adaptability analysis program to obtain the protection adaptability analysis result.

[0148] This embodiment provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the following method is implemented:

[0149] Determine a steady-state model for fault simulation according to a pre-established multi-frequency aggregation system model, determine a fault point based on the steady-state model, and perform batch fault simulations for the fault point to obtain model operation parameters under all faults;

[0150] If it is determined according to the model operation parameters that the new energy units of the steady-state model can be successfully started to the steady state, record the change amount of the model operation parameters after batch fault simulation;

[0151] Determine the fixed value verification content according to the change amount of the model operation parameters, determine the protection adaptability analysis program corresponding to the fixed value verification content, and perform protection adaptability analysis calculation through the protection adaptability analysis program to obtain the protection adaptability analysis result.

[0152] Compared with the technical solutions in the prior art, the new energy power station protection fixed value automatic verification method provided by the embodiments of the present invention determines the steady-state model for fault simulation according to the pre-built multi-frequency aggregation system model, determines the fault point according to the steady-state model, and performs batch fault simulation for the fault point to obtain the model operation parameters under all faults; if the new energy unit of the steady-state model can be successfully started to the steady state according to the model operation parameters, record the change amount of the model operation parameters after the batch fault simulation; determine the fixed value verification content according to the change amount of the model operation parameters, determine the protection adaptability analysis program corresponding to the fixed value verification content, and perform protection adaptability analysis calculation through the protection adaptability analysis program to obtain the protection adaptability analysis result, which can accurately verify the protection fixed value of the new energy power station, thereby ensuring the safe operation of new energy transmission.

[0153] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can 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.

[0154] The present invention is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0155] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device realizes the functions in the processFigure 1 one process or multiple processes and / or boxes Figure 1 the functions specified in one box or multiple boxes.

[0156] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one process or multiple processes and / or boxes Figure 1 one box or multiple boxes.

[0157] In the description of this specification, the descriptions with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0158] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for automatically verifying the protection setting values of a new energy power station, characterized in that, Including: Determine a steady-state model for fault simulation according to a pre-built multi-frequency aggregation system model, determine a fault point according to the steady-state model, and perform batch fault simulations for the fault point to obtain model operation parameters under all faults; If it is determined according to the model operation parameters that the new energy unit of the steady-state model can be successfully started to the steady state, record the change amount of the model operation parameters after the batch fault simulation; Determine the setting verification content according to the change amount of the model operation parameters, determine the protection adaptability analysis program corresponding to the setting verification content, and perform protection adaptability analysis calculations through the protection adaptability analysis program to obtain the protection adaptability analysis result.

2. The method for automatically verifying the protection setting values of a new energy power station according to claim 1, wherein The determining a steady-state model for fault simulation according to a pre-built multi-frequency aggregation system model includes: Determine the control mode according to the multi-frequency aggregation system model, and determine various model operation modes according to the control mode; Simulate a single-phase metallic grounding fault for each model operation mode respectively, and select the steady-state condition corresponding to the model operation mode with the minimum steady-state short-circuit current as the steady-state model.

3. The method for automatically verifying protection setting values of a new energy power station according to claim 1, wherein The method for automatically verifying the protection setting value of a new energy substation further includes: If it is determined according to the model operation parameters that the new energy unit of the steady-state model can be successfully started to the steady state, obtain the recorded data of the change amount of the model operation parameters in a preset time period before the batch fault simulation, and record the change amount of the model operation parameters after the batch fault simulation.

4. The method for automatically verifying the protection setting values of a new energy power station according to claim 1, wherein Determine the model parameters according to the multi-frequency aggregation system model; correspondingly, the method for automatically verifying the protection setting value of a new energy substation further includes: If it is determined according to the model operation parameters that the new energy unit of the steady-state model fails to be successfully started to the steady state, rebuild the multi-frequency aggregation system model by adjusting the model parameters, and execute the steps of determining a steady-state model for fault simulation according to the rebuilt multi-frequency aggregation system model and subsequent steps.

5. The method for automatically verifying the protection setting values of a new energy power station according to claim 1, wherein, The determining the setting verification content according to the change amount of the model operation parameters includes: Read the change amount of the model operation parameters in parallel batches, perform setting verification in real time according to the change amount of the model operation parameters read in parallel batches, and select the setting verification content according to the setting verification result.

6. The method for automatically verifying protection setting values of a new energy power station according to claim 1, wherein The determining the protection adaptability analysis program corresponding to the setting verification content and performing protection adaptability analysis calculations through the protection adaptability analysis program to obtain the protection adaptability analysis result includes: If it is determined according to the calculation result that the protection adaptability does not meet the preset requirements, modify the protection setting value, and execute the steps of determining the setting verification content according to the change amount of the model operation parameters and subsequent steps.

7. A protection setting automatic verification device for a new energy power station, characterized in that, Including: An acquisition unit, configured to determine a steady-state model for fault simulation according to a pre-built multi-frequency aggregation system model, determine a fault point according to the steady-state model, and perform batch fault simulations for the fault point to obtain model operation parameters under all faults; A determination unit, configured to record the change amount of the model operation parameters after the batch fault simulation if it is determined according to the model operation parameters that the new energy unit of the steady-state model can be successfully started to the steady state; A verification unit, configured to determine fixed-value verification content according to the change amount of the model operation parameters, determine a protection adaptability analysis program corresponding to the fixed-value verification content, and perform protection adaptability analysis calculations through the protection adaptability analysis program to obtain a protection adaptability analysis result.

8. A computer device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

10. A computer program product, characterized in that, The computer program product includes a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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