Protection setting value checking method and device for offshore wind power grid-related equipment, terminal equipment and storage medium

Abstract

The invention discloses a protection setting value checking method and device for offshore wind power grid-related equipment, terminal equipment and a storage medium, and belongs to the technical field of protection setting value checking. The method comprises the steps that a preset power grid simulation topology model and current operation data of a power grid are acquired; for each fault type, inputting the current operation data, a preset fault data set corresponding to the fault type and a corresponding preset protection constant value into a power grid simulation topology model for fault simulation, and checking the preset protection constant value based on a simulation result to obtain a checking result; and finally, under the condition that the checking result is reasonable, performing protection constant value setting on a protection device in the power grid according to a preset protection constant value. By implementing the method and the device, the problem that the accuracy and the reliability of power grid operation are reduced due to the fact that the current power grid operation requirement is difficult to meet since the protection constant value is set only by means of the past empirical value in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the field of protection setting value verification technology, and in particular to a protection setting value verification method, device, terminal equipment and storage medium for offshore wind power grid-related equipment. Background Art

[0002] With the rapid development of offshore wind power technology, the scale and capacity of wind farms are constantly increasing, and the complexity of grid access is also increasing. Therefore, the setting of protection settings is crucial for the stable operation of wind power equipment in the grid.

[0003] In the existing technology, when setting protection settings, it is often based solely on expert experience. However, as the scale and capacity of wind farms continue to increase, past experience values ​​are increasingly unable to meet current grid operation requirements, resulting in reduced accuracy and reliability of grid operation. Summary of the Invention

[0004] The present invention provides a method, device, terminal device and storage medium for verifying protection constant values ​​of offshore wind power grid-related equipment, which can solve the problem in the prior art that protection constant values ​​are set only based on past experience values, making it difficult to meet current grid operation requirements and reducing the accuracy and reliability of grid operation.

[0005] An embodiment of the present invention provides a method for verifying protection settings of offshore wind power grid-related equipment, comprising:

[0006] Obtain the preset power grid simulation topology model and the current operation data of the power grid;

[0007] For each fault type, current operating data, a preset fault data set corresponding to the fault type, and a corresponding preset protection setting are input into the power grid simulation topology model, so that the power grid simulation topology model performs a fault simulation under the preset protection setting based on the fault data set and the current operating data, and obtains a grid voltage amplitude curve of the power grid, a grid connection point voltage amplitude curve of the wind turbine, a reactive power output curve of the wind turbine, a voltage recovery curve of the wind turbine, and an action time of a protection device in the power grid;

[0008] Based on the grid voltage amplitude curve, the grid connection point voltage amplitude curve, the reactive power output curve, the voltage recovery curve, and the action time, the preset protection setting is calibrated for low voltage ride-through capability, high voltage ride-through capability, and protection action reliability to obtain a calibration result;

[0009] When the above verification results are reasonable, the protection settings of the protection devices in the above power grid are set according to the above preset protection settings.

[0010] Furthermore, the construction of the above-mentioned preset power grid simulation topology model includes:

[0011] Obtaining electrical parameters of each power element in the power grid; wherein the power elements include: busbars;

[0012] The above-mentioned busbars are used as nodes and the connections between the busbars as edges to construct a power grid topology model;

[0013] The electrical parameters corresponding to each power element are used as the characteristics of the above-mentioned nodes and edges to generate the above-mentioned preset power grid simulation topology model.

[0014] Furthermore, based on the grid voltage amplitude curve, the grid connection point voltage amplitude curve, the reactive power output curve, the voltage recovery curve, and the action time, the preset protection setting is calibrated for low voltage ride-through capability, high voltage ride-through capability, and protection action reliability, to obtain calibration results, including:

[0015] Extracting from the grid voltage amplitude curve and the grid connection point voltage amplitude curve a first grid voltage amplitude curve during a voltage drop, a first grid connection point voltage amplitude curve, a second grid voltage amplitude curve during a voltage increase, and a second grid connection point voltage amplitude curve;

[0016] Determining, based on the reactive power output curve, a first reactive power within a first preset period after a voltage drop occurs and a second reactive power within a second preset period after a voltage rise occurs;

[0017] Extracting from the voltage recovery curve the first voltage recovery time of the wind turbine after a voltage drop and the second voltage recovery time after a voltage increase;

[0018] performing a low voltage ride-through capability check based on the first grid voltage amplitude curve, the first grid connection point voltage amplitude curve, the first reactive power, and the first voltage recovery time to obtain a low voltage ride-through check result;

[0019] Performing a high voltage ride-through capability check based on the second grid voltage amplitude curve, the second grid connection point voltage amplitude curve, the second reactive power, and the second voltage recovery time to obtain a high voltage ride-through check result;

[0020] According to the above action time, the reliability of the protection action is checked to obtain the protection action verification result;

[0021] When the above-mentioned low voltage ride-through verification results, high voltage ride-through verification results and protection action verification results are all reasonable, the above-mentioned verification results are determined to be reasonable; otherwise, the above-mentioned verification results are determined to be unreasonable.

[0022] Furthermore, the low voltage ride-through capability is checked based on the first grid voltage amplitude curve, the first grid connection point voltage amplitude curve, the first reactive power, and the first voltage recovery time, to obtain a low voltage ride-through check result, including:

[0023] Calculate the first voltage amplitude deviation at each moment based on the first grid voltage amplitude curve and the first grid connection point voltage amplitude curve;

[0024] When all first voltage amplitude deviations are less than the preset voltage amplitude threshold, it is determined that the grid-connected operation capability in the low voltage ride-through verification is reliable;

[0025] When the first reactive power is greater than a preset first reactive power threshold, determining that the reactive support capability in the low voltage ride through check is reliable;

[0026] If the first voltage recovery time does not exceed a first preset voltage recovery time threshold, determining that the voltage recovery capability in the low voltage ride-through check is reliable;

[0027] If the grid-connected operation capability, reactive power support capability, and voltage recovery capability in the above-mentioned low voltage ride through verification are reliable, the above-mentioned low voltage ride through verification result is judged to be reasonable; otherwise, the above-mentioned low voltage ride through verification result is judged to be unreasonable.

[0028] Furthermore, a high voltage ride-through capability check is performed based on the second grid voltage amplitude curve, the second grid connection point voltage amplitude curve, the first reactive power, the second reactive power, and the second voltage recovery time, to obtain a high voltage ride-through check result, including:

[0029] Calculate the second voltage amplitude deviation at each moment based on the second grid voltage amplitude curve and the second grid connection point voltage amplitude curve;

[0030] When all the second voltage amplitude deviations are less than the preset voltage amplitude threshold, it is determined that the grid-connected operation capability in the high voltage ride-through verification is reliable;

[0031] When the second reactive power is greater than a preset second reactive power threshold, determining that the reactive support capability in the high voltage ride through check is reliable;

[0032] If the second voltage recovery time does not exceed a second preset voltage recovery time threshold, determining that the voltage recovery capability in the high voltage ride-through check is reliable;

[0033] If the grid-connected operation capability, reactive power support capability, and voltage recovery capability in the above-mentioned high voltage ride through verification are reliable, the above-mentioned high voltage ride through verification result is judged to be reasonable; otherwise, the above-mentioned high voltage ride through verification result is judged to be unreasonable.

[0034] Furthermore, based on the above action time, the reliability of the protection action is checked to obtain the protection action check result, including:

[0035] If the above action time exceeds the corresponding preset action time threshold, the above protection action verification result is judged to be unreasonable; otherwise, the above protection action verification result is judged to be reasonable.

[0036] Based on the above method embodiment, the present invention provides a corresponding device embodiment;

[0037] The present invention provides a protection setting value verification device for offshore wind power grid-related equipment, comprising:

[0038] Data acquisition module, simulation module, calibration result determination module and protection setting value setting module;

[0039] The data acquisition module is used to obtain the preset power grid simulation topology model and the current operation data of the power grid;

[0040] The simulation module is configured to input, for each fault type, current operating data, a preset fault data set corresponding to the fault type, and a corresponding preset protection setting into the power grid simulation topology model, so that the power grid simulation topology model performs a fault simulation under the preset protection setting based on the fault data set and current operating data, and obtains, in the power grid, a grid voltage amplitude curve, a grid connection point voltage amplitude curve of the wind turbine, a reactive power output curve of the wind turbine, a voltage recovery curve of the wind turbine, and an action time of a protection device in the power grid;

[0041] The verification result determination module is configured to perform a low voltage ride-through capability verification, a high voltage ride-through capability verification, and a protection action reliability verification on the preset protection setting value based on the grid voltage amplitude curve, the grid connection point voltage amplitude curve, the reactive power output curve, the voltage recovery curve, and the action time, to obtain a verification result;

[0042] The protection setting value setting module is used to set the protection setting value of the protection device in the above-mentioned power grid according to the above-mentioned preset protection setting value when the above-mentioned verification result is reasonable.

[0043] Furthermore, the data acquisition module includes:

[0044] Electrical parameter acquisition unit, topology model building unit and simulation model building unit;

[0045] The electrical parameter acquisition unit is used to acquire the electrical parameters of each power element in the power grid; wherein the power elements include: busbar;

[0046] The topology model building unit is used to build a power grid topology model using the busbars as nodes and the connections between the busbars as edges;

[0047] The simulation model construction unit is configured to use the electrical parameters corresponding to the power components as the features of the nodes and edges to generate the preset power grid simulation topology model.

[0048] Based on the above method embodiment, the present invention provides a corresponding terminal device embodiment;

[0049] The present invention provides a terminal device, including a processor, a memory, and a computer program stored in the above-mentioned memory and configured to be executed by the above-mentioned processor. When the above-mentioned processor executes the above-mentioned computer program, it implements the protection constant value calibration method of offshore wind power grid-related equipment mentioned in any embodiment of the present invention.

[0050] Based on the above method embodiment, the present invention provides a storage medium embodiment;

[0051] The present invention provides a storage medium comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the method for verifying protection constants of offshore wind power grid-related equipment according to any one of the embodiments of the present invention is implemented.

[0052] The embodiments of the present invention have the following beneficial effects:

[0053] The present invention provides a protection constant calibration method, device, terminal device and storage medium for offshore wind power grid-related equipment. The method includes: obtaining a preset power grid simulation topology model and the current operating data of the power grid; then, for each fault type, inputting the current operating data, the preset fault data set corresponding to the above fault type, and the corresponding preset protection constant into the above power grid simulation topology model, so that the above power grid simulation topology model performs fault simulation under the above preset protection constant according to the above fault data set and the current operating data, and obtains the power grid voltage amplitude curve, the grid connection point voltage amplitude curve of the wind turbine, the reactive power output curve of the wind turbine, the voltage recovery curve of the wind turbine, and the action time of the protection device in the above power grid; then, according to the above power grid voltage amplitude curve, the grid connection point voltage amplitude curve, the reactive power output curve, the voltage recovery curve and the above action time, the above preset protection constant is calibrated for low voltage ride-through capability, high voltage ride-through capability and protection action reliability to obtain a calibration result; finally, when the above calibration result is reasonable, the protection constant of the protection device in the above power grid is set according to the above preset protection constant. Therefore, the present invention simulates the preset power grid simulation topology model in combination with the current operating data of the power grid, the preset fault data corresponding to each fault type, and the preset protection setting corresponding to each fault type, and performs low voltage ride-through capability verification, high voltage ride-through capability verification, and protection action reliability verification on the preset protection setting based on the simulation results. Finally, the final protection setting is determined based on the verification results, so that the final protection setting is consistent with the current power grid operation status and does not rely solely on the empirical value of the process. When the power grid operates under the final protection setting, the accuracy and reliability are also greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0055] Figure 1 The present invention provides a flowchart of a method for verifying protection settings of offshore wind power grid-related equipment according to an embodiment of the present invention.

[0056] Figure 2 This is a curve diagram of voltage drop in an offshore wind power grid-connected system provided by one embodiment of the present invention in the event of an AC fault.

[0057] Figure 3 This is a curve diagram of voltage increase in an offshore wind power grid-connected system under AC disturbance conditions provided by one embodiment of the present invention.

[0058] Figure 4 It is a structural schematic diagram of a protection setting value calibration device for offshore wind power grid-related equipment provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0059] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0061] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0062] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0064] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0065] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0066] See also Figure 1 In order to solve the problem in the prior art that protection setting values ​​are set based solely on past experience, which makes it difficult to meet current grid operation requirements and reduces the accuracy and reliability of grid operation, an embodiment of the present invention provides a protection setting value verification method for offshore wind power grid-related equipment, comprising:

[0067] Step S101: obtaining a preset power grid simulation topology model and current power grid operation data;

[0068] Specifically, the above operating data includes voltage, electricity, and load power, etc.

[0069] In a preferred embodiment, the construction of the preset power grid simulation topology model includes:

[0070] Obtaining electrical parameters of each power element in the power grid; wherein the power elements include: busbars;

[0071] Specifically, the above-mentioned power elements include generators, transformers, and busbars, and the electrical parameters include the rated power of the generator, the rated capacity of the transformer, the line length, and the line impedance, etc.

[0072] The above-mentioned busbars are used as nodes and the connections between the busbars as edges to construct a power grid topology model;

[0073] In schematic form, the busbars are used as nodes, and the lines and transformers between the busbars are used as edges. This ensures that the model can accurately reflect the actual connection mode of the power grid.

[0074] The electrical parameters corresponding to each power element are used as the characteristics of the above-mentioned nodes and edges to generate the above-mentioned preset power grid simulation topology model.

[0075] Preferably, the above-mentioned preset power grid simulation topology model can be established using power system simulation software (such as PSASP, PSS / E, ETAP, etc.).

[0076] In this preferred embodiment, a preset power grid simulation topology model is generated by taking the busbars as nodes and the connection relationships between the busbars as edges, and combining the electrical parameters corresponding to the power components.

[0077] Step S102: For each fault type, current operating data, a preset fault data set corresponding to the fault type, and a corresponding preset protection setting are input into the power grid simulation topology model, so that the power grid simulation topology model performs a fault simulation under the preset protection setting based on the fault data set and the current operating data, and obtains a grid voltage amplitude curve of the power grid, a grid connection point voltage amplitude curve of the wind turbine, a reactive power output curve of the wind turbine, a voltage recovery curve of the wind turbine, and an action time of a protection device in the power grid;

[0078] Specifically, the above fault types include: single-phase grounding fault, that is, a short circuit occurs between a phase and the ground; two-phase short circuit fault, that is, a short circuit occurs between any two phases; two-phase grounding short circuit fault, that is, a short circuit occurs between any two phases and the ground at the same time; three-phase short circuit fault, that is, a short circuit occurs between the three phases at the same time; permanent fault, that is, the fault lasts for a long time (such as more than 0.5 seconds) and needs to be manually or automatically cut off; voltage rise fault, that is, voltage rise caused by AC disturbance or other reasons; voltage drop fault, that is, voltage drop caused by AC fault or other reasons; transformer fault, that is, short circuit or grounding fault occurs inside or outside the transformer.

[0079] Specifically, for single-phase grounding fault, two-phase short circuit fault, two-phase grounding short circuit fault and three-phase short circuit fault, the corresponding protection setting that needs to be calibrated is the distance protection setting; for permanent fault and transformer fault, the corresponding protection setting that needs to be calibrated is the overcurrent protection setting; for voltage rise fault, the corresponding protection setting that needs to be calibrated is the high voltage protection setting; for voltage drop fault, the corresponding protection setting that needs to be calibrated is the low voltage protection.

[0080] Specifically, the preset fault data set includes the fault occurrence time, fault duration, fault recovery time, and fault location for the corresponding fault type. Fault locations include: line headend (the starting point of the line near the substation or power plant); line midpoint (the middle of the line); line end (the end of the line away from the substation or power plant); busbar nodes within substations; the high-voltage side, low-voltage side, or interior of a transformer; the output terminal of a generator; and the connection point between a wind farm or photovoltaic power station and the grid.

[0081] Indicatively, for a single-phase grounding fault, the fault location can be set at the beginning, middle or end of the line, the fault duration can be set to 0.1 second, 0.2 second or 0.5 second, and the fault occurrence time can be set to 0 second; for a three-phase short circuit fault, the fault location can be set at the busbar, the high-voltage side of the transformer or the generator outlet, the fault duration can be set to 0.1 second, 0.5 second or 1 second, and the fault occurrence time can be set to 0 second; for a voltage rise fault, the fault location can be set at the grid connection point, the fault duration can be set to 0.5 second or 1 second, and the fault occurrence time can be set to 0 second; for a voltage drop fault, the fault location can be set at the grid connection point, the fault duration can be set to 0.1 second, 0.2 second or 0.5 second, and the fault occurrence time can be set to 0 second.

[0082] Specifically, after the simulation starts, the grid voltage amplitude curve of the power grid that changes with time, the grid connection point voltage amplitude curve that changes with time of the wind turbine generator set, the reactive power output curve that changes with time of the wind turbine generator set's reactive power output, the voltage recovery curve that changes with time of the wind turbine generator set's voltage during the recovery period, and the action time of the protection device in the above-mentioned power grid are recorded in real time during the simulation period.

[0083] Preferably, based on different fault types, corresponding preset fault data sets are injected into the power grid simulation topology model to simulate different fault scenarios.

[0084] Step S103: Based on the grid voltage amplitude curve, the grid connection point voltage amplitude curve, the reactive power output curve, the voltage recovery curve, and the action time, the preset protection setting is calibrated for low voltage ride-through capability, high voltage ride-through capability, and protection action reliability to obtain a calibration result;

[0085] Specifically, high voltage ride through means that when a fault or fluctuation in the power grid causes the voltage at the wind farm grid connection point to rise, the voltage can be within a certain range, and the wind turbine can ensure uninterrupted grid connection operation. More importantly, it can provide a certain capacity of reactive power support to the power grid to help reduce the voltage at the grid connection point. Low voltage ride through means that when a fault or fluctuation in the power grid causes the voltage at the wind farm grid connection point to drop, the voltage can be within a certain range, and the wind turbine can ensure uninterrupted grid connection operation. More importantly, it can provide a certain capacity of reactive power support to the power grid to help increase the voltage at the grid connection point, and then safely pass through this fault operation period, achieving the purpose of supporting the power grid and protecting the wind turbine. Schematically, the voltage drop curve of the offshore wind power grid connection system under AC fault conditions is shown in the figure below. Figure 2 As shown, Figure 2 The horizontal axis represents time (unit is s), and the vertical axis represents the grid connection point voltage (unit is per unit, pu). Figure 2It can be seen that before time 0 seconds, it is the initial state, and the voltage remains at 1.0pu, indicating that the system is in normal operation; then the AC fault causes the voltage to drop. At time 0 seconds, due to the AC fault, the voltage suddenly drops to 0.2pu, which is the lowest voltage value in the figure; starting from 0.15 seconds, the voltage begins to gradually recover until 0.625 seconds, when the voltage recovers to 0.8pu. During this period, the system can maintain grid-connected operation without being disconnected from the grid; at 2 seconds, the voltage recovers to 1.0pu, reaching the normal operating voltage level. This recovery process is marked with a "voltage contour line" in the figure; finally, after the voltage recovers to 1.0pu, the system can continue to operate stably, or choose to shut down, depending on the specific operation strategy and grid requirements. Overall, Figure 2 It demonstrates the response capability of the offshore wind power grid-connected system in the face of voltage drops, as well as its operating status during the voltage recovery process.

[0086] Schematically, the voltage rise curve of the offshore wind power grid-connected system under AC disturbance is shown in the figure below: Figure 3 As shown in the figure, the horizontal axis represents time (unit is s) and the vertical axis represents the grid connection point voltage (unit is per unit, pu). Figure 3 It can be seen that before time 0 seconds, the voltage remained at 1.0 pu, indicating that the system was in normal operation. At time 0 seconds, due to the AC disturbance, the voltage suddenly rose to 1.3 pu, which is the highest voltage value in the figure. From 0.5 seconds on, the voltage began to gradually decrease until 1 second, when it returned to 1.25 pu. During this period, the system was able to maintain grid-connected operation and did not disconnect from the grid. After 1 second, the voltage continued to decrease until about 3 seconds, when it returned to 1.1 pu. Figure 3 The “voltage contour line” in Figure 1 shows the recovery process; after the voltage returns to 1.1 pu, the system can continue to operate stably or choose to shut down, depending on the specific operation strategy and grid demand. Figure 3 It demonstrates the response capability of the offshore wind power grid-connected system in the face of voltage increase, as well as its operating status during the voltage recovery process.

[0087] In a preferred embodiment, the preset protection setting is subjected to low voltage ride-through capability verification, high voltage ride-through capability verification, and protection action reliability verification based on the grid voltage amplitude curve, the grid connection point voltage amplitude curve, the reactive power output curve, the voltage recovery curve, and the action time, and verification results are obtained, including:

[0088] Extracting from the grid voltage amplitude curve and the grid connection point voltage amplitude curve a first grid voltage amplitude curve during a voltage drop, a first grid connection point voltage amplitude curve, a second grid voltage amplitude curve during a voltage increase, and a second grid connection point voltage amplitude curve;

[0089] Specifically, after a fault occurs, voltage drops and abnormal voltage increases may occur, so the corresponding voltage amplitude changes need to be recorded.

[0090] Determining, based on the reactive power output curve, a first reactive power within a first preset period after a voltage drop occurs and a second reactive power within a second preset period after a voltage rise occurs;

[0091] Extracting from the voltage recovery curve the first voltage recovery time of the wind turbine after a voltage drop and the second voltage recovery time after a voltage increase;

[0092] performing a low voltage ride-through capability check based on the first grid voltage amplitude curve, the first grid connection point voltage amplitude curve, the first reactive power, and the first voltage recovery time to obtain a low voltage ride-through check result;

[0093] Performing a high voltage ride-through capability check based on the second grid voltage amplitude curve, the second grid connection point voltage amplitude curve, the second reactive power, and the second voltage recovery time to obtain a high voltage ride-through check result;

[0094] According to the above action time, the reliability of the protection action is checked to obtain the protection action verification result;

[0095] When the above-mentioned low voltage ride-through verification results, high voltage ride-through verification results and protection action verification results are all reasonable, the above-mentioned verification results are determined to be reasonable; otherwise, the above-mentioned verification results are determined to be unreasonable.

[0096] In this preferred embodiment, the low voltage ride-through capability verification, high voltage ride-through capability verification and protection action reliability verification are performed based on the grid voltage amplitude curve, the grid connection point voltage amplitude curve, the reactive power output curve, the voltage recovery curve and the action time, and the verification results are obtained.

[0097] In another preferred embodiment, the low voltage ride-through capability verification is performed based on the first grid voltage amplitude curve, the first grid connection point voltage amplitude curve, the first reactive power, and the first voltage recovery time to obtain a low voltage ride-through verification result, including:

[0098] Calculate the first voltage amplitude deviation at each moment based on the first grid voltage amplitude curve and the first grid connection point voltage amplitude curve;

[0099] When all first voltage amplitude deviations are less than the preset voltage amplitude threshold, it is determined that the grid-connected operation capability in the low voltage ride-through verification is reliable;

[0100] Specifically, if all first voltage amplitude deviations are smaller than the preset voltage amplitude threshold, it indicates that the wind turbine generator set can maintain grid-connected operation, and therefore the grid-connected operation capability of the corresponding protection setting is reliable.

[0101] When the first reactive power is greater than a preset first reactive power threshold, determining that the reactive support capability in the low voltage ride through check is reliable;

[0102] Specifically, the reliability assessment of reactive power support capability is primarily to check whether the wind turbine can provide sufficient reactive power support during voltage drops and maintain a certain level. If the first reactive power is greater than a preset first reactive power threshold, the reactive power support capability is reliable.

[0103] If the first voltage recovery time does not exceed a first preset voltage recovery time threshold, determining that the voltage recovery capability in the low voltage ride-through check is reliable;

[0104] Specifically, voltage recovery capability is mainly used to determine whether the voltage of a wind turbine can recover to the target voltage value within a certain period of time after a voltage drop (for example, the voltage starts to recover within 0.15 seconds and recovers to above 0.8pu within 0.625 seconds). If so, it indicates that the voltage recovery capability is reliable.

[0105] If the grid-connected operation capability, reactive power support capability, and voltage recovery capability in the above-mentioned low voltage ride through verification are reliable, the above-mentioned low voltage ride through verification result is judged to be reasonable; otherwise, the above-mentioned low voltage ride through verification result is judged to be unreasonable.

[0106] In this preferred embodiment, after performing low voltage ride-through capability verification based on the first grid voltage amplitude curve, the first grid connection point voltage amplitude curve, the first reactive power and the first voltage recovery time, a low voltage ride-through verification result is obtained.

[0107] In another preferred embodiment, a high voltage ride-through capability check is performed based on the second grid voltage amplitude curve, the second grid connection point voltage amplitude curve, the first reactive power, the second reactive power, and the second voltage recovery time, to obtain a high voltage ride-through check result, including:

[0108] Calculate the second voltage amplitude deviation at each moment based on the second grid voltage amplitude curve and the second grid connection point voltage amplitude curve;

[0109] When all the second voltage amplitude deviations are less than the preset voltage amplitude threshold, it is determined that the grid-connected operation capability in the high voltage ride-through verification is reliable;

[0110] Specifically, similar to the low voltage ride-through check, if all the second voltage amplitude deviations are less than the above-mentioned preset voltage amplitude threshold, it indicates that under the current preset protection setting, it can ensure that the wind turbine can maintain grid-connected operation during the voltage rise period.

[0111] When the second reactive power is greater than a preset second reactive power threshold, determining that the reactive support capability in the high voltage ride through check is reliable;

[0112] Specifically, similar to the low voltage ride-through check, if the second reactive power is greater than the preset second reactive power threshold, it indicates that the motor group can provide sufficient reactive support during the voltage rise period, so that after the fault occurs, the reactive power can increase rapidly and maintain a certain level.

[0113] If the second voltage recovery time does not exceed a second preset voltage recovery time threshold, determining that the voltage recovery capability in the high voltage ride-through check is reliable;

[0114] Specifically, similar to the low voltage ride-through check, if the second voltage recovery time does not exceed the second preset voltage recovery time threshold, it indicates that the voltage recovery curve meets the high voltage ride-through specification requirements and the voltage recovery capability is reliable.

[0115] If the grid-connected operation capability, reactive power support capability, and voltage recovery capability in the above-mentioned high voltage ride through verification are reliable, the above-mentioned high voltage ride through verification result is judged to be reasonable; otherwise, the above-mentioned high voltage ride through verification result is judged to be unreasonable.

[0116] In this preferred embodiment, the high voltage ride-through capability is verified based on the second grid voltage amplitude curve, the second grid connection point voltage amplitude curve, the first reactive power, the second reactive power and the second voltage recovery time, and the high voltage ride-through verification result is obtained.

[0117] In another preferred embodiment, a protection action reliability check is performed based on the above-mentioned action time to obtain a protection action check result, including:

[0118] If the above action time exceeds the corresponding preset action time threshold, the above protection action verification result is judged to be unreasonable; otherwise, the above protection action verification result is judged to be reasonable.

[0119] Specifically, the protection settings include: the operating current and operating time corresponding to overcurrent protection, which aims to perform protective actions within the above operating time when the line current exceeds the above operating current (such as tripping, cutting off related equipment and lines, etc., to prevent equipment from being damaged by overcurrent); the line protection range and operating time corresponding to distance protection, which aims to perform protective actions when the fault occurs within the line protection range, so as to cut off the faulty line, quickly isolate the fault, and reduce the impact on the power grid; the operating voltage and operating time corresponding to low voltage protection, which aims to cut off related equipment or lines when the power grid drops to a certain level, to prevent damage due to low voltage; the operating voltage and operating time of high voltage protection, which aims to cut off equipment or lines when the power grid voltage rises to a certain level, to prevent equipment from being damaged by severe high voltage.

[0120] In schematic form, overcurrent protection also includes time-limited overcurrent protection and inverse-time overcurrent protection. For time-limited overcurrent protection, when the current flowing through the device exceeds the set operating current value, the timer will start. When the current reaches the operating value and lasts for a certain period of time, the device will operate within the operating time. For inverse-time overcurrent protection, the device's overheating characteristic curve is used for judgment. When the current exceeds the device's allowable overheating current threshold, the protection device's operating time will decrease as the current increases, and its operating characteristics match the device's overheating characteristics. The operating current calculation formula is:

[0121] I 动作 =K 可靠 ×I 额定 ×K 返回

[0122] Where, I 动作 Indicates the operating current, K 可靠 Represents the reliability coefficient, usually 1.05, I 额定 Indicates the rated current of the device, K 返回 Indicates the return coefficient, ranging from 0.9 to 0.95.

[0123] Schematically, distance protection also includes one-stage protection, two-stage protection, and three-stage protection. For one-stage protection, when the fault occurs within the line protection range, that is, within 80% of the total length of the line, the protection device will operate within the action time (the action time can be set to 0s). For two-stage protection, when the fault occurs within the line protection range, that is, outside 80% of the total length of the line, and extends to within 30% of the adjacent line, the protection device will operate within the corresponding action time (the action time can be set to increase by 0.3s, that is, the action will be delayed by 0.3s to prevent the adjacent line from being accidentally cut off). For three-stage protection, when the fault current exceeds the maximum load current, the protection device will operate, and its action time is adjusted according to the time to avoid the maximum load current.

[0124] Indicatively, for low voltage protection, three types of operating voltages are set, namely 0.2 times the rated voltage (for rapid response to severe voltage drops), 0.8 times (for moderate voltage drops) and 0.9 to 1.1 times (for slight voltage drops). When the voltage drops to 0.2 times the rated voltage, the protection device will quickly issue a tripping command to cut off the equipment or line to prevent the equipment from being damaged by severe low voltage. When the voltage drops to 0.8 times the rated voltage, the protection device will delay the tripping command for a certain period of time to avoid false operation due to short-term voltage fluctuations. When the voltage drops to 0.9 to 1.1 times the rated voltage, the protection device will issue an alarm signal to remind the operating personnel to pay attention to the voltage change, but it will not necessarily trip immediately.

[0125] Indicatively, two operating voltages are set for high voltage protection: 1.1 times the rated voltage (for rapid response to severe voltage increases) and 0.9 to 1.1 times (for moderate voltage increases). When the voltage rises to greater than 1.1 times the rated voltage, the protection device will quickly issue a trip command to cut off the equipment or line to prevent damage to the equipment due to severe high voltage. When the voltage rises to 0.9 to 1.1 times the rated voltage, the protection device will issue a trip command after a certain delay, or send an alarm signal to alert the operator to the voltage change.

[0126] Preferably, the protection action reliability check can ensure that after a fault occurs, the protection device can accurately operate within the action time to avoid false operation and refusal to operate.

[0127] In this preferred embodiment, the reliability of the protection action is checked by the action time, and the protection action check result is obtained.

[0128] In step S104, when the verification result is reasonable, the protection setting value of the protection device in the power grid is set according to the preset protection setting value.

[0129] Preferably, if the verification result is unreasonable, the fault scenario is re-evaluated and the fault settings are re-checked for rationality, including parameters such as fault type, fault location, and fault duration, to ensure that the fault scenario covers various situations encountered in actual operation. If the voltage recovery time is too long during the low voltage ride-through verification, the low voltage protection action threshold can be appropriately lowered, for example, from 0.2 pu to 0.15 pu. If the reactive power support capacity is insufficient, the wind turbine's reactive power control strategy can be adjusted, for example, by increasing the response speed of reactive power output or adjusting the reactive power setpoint. If the wind turbine is prone to disconnection during voltage sags, the wind turbine's control strategy can be reviewed and optimized to ensure it can better adapt to voltage sags. If the voltage recovery time is too long during the high voltage ride-through verification, the high voltage protection action voltage threshold can be appropriately increased, for example, from 1.1 pu to 1.15 pu. If the reactive power support capacity is insufficient, the wind turbine's reactive power control strategy also needs to be adjusted to ensure it can provide sufficient reactive power support when the voltage rises. If wind turbines are prone to disconnecting from the grid during periods of voltage increases, the control strategy of the wind turbines can be optimized to ensure that they can adapt to the voltage increase.

[0130] Specifically, after adjusting the protection settings, it is necessary to re-run simulations to verify whether the adjusted protection settings meet the requirements for low voltage ride-through and high voltage ride-through. Therefore, through multiple simulations and verifications, the protection settings are gradually optimized until all conditions are met.

[0131] Preferably, in actual operation, protection settings can be dynamically adjusted based on the actual grid operation and monitoring data. For example, if the grid's short-circuit current level changes or new equipment is connected, the protection settings should be promptly recalibrated and adjusted. A certain amount of redundancy can be introduced into the protection settings to cope with extreme situations. For example, multiple levels of protection settings can be set. After the first level protection is activated, if the fault persists, the second level protection can be triggered.

[0132] Preferably, initially, corresponding protection settings can be preliminarily set based on the factory parameters of the equipment, grid design requirements and relevant standards.

[0133] Preferably, the present invention ensures the accuracy and reliability of the simulation model by comprehensively collecting relevant electrical parameters, topological structure information, and protection setting information of power components. Through a comprehensive fault set, all possible fault conditions are covered as much as possible, ensuring the comprehensiveness and accuracy of the simulation calculation. Subsequently, through detailed verification and evaluation, the rationality and adaptability of the protection setting are ensured to meet the requirements of high voltage ride-through capability and low voltage ride-through capability. Finally, the method of the present invention is applicable to various offshore wind power grid-related equipment and has wide applicability and practicality.

[0134] Based on the above method embodiments, the present invention provides corresponding device embodiments.

[0135] like Figure 4 As shown, an embodiment of the present invention provides a protection setting value verification device for offshore wind power grid-related equipment, comprising:

[0136] Data acquisition module, simulation module, calibration result determination module and protection setting value setting module;

[0137] The data acquisition module is used to obtain the preset power grid simulation topology model and the current operation data of the power grid;

[0138] The simulation module is configured to input, for each fault type, current operating data, a preset fault data set corresponding to the fault type, and a corresponding preset protection setting into the power grid simulation topology model, so that the power grid simulation topology model performs a fault simulation under the preset protection setting based on the fault data set and current operating data, and obtains, in the power grid, a grid voltage amplitude curve, a grid connection point voltage amplitude curve of the wind turbine, a reactive power output curve of the wind turbine, a voltage recovery curve of the wind turbine, and an action time of a protection device in the power grid;

[0139] The verification result determination module is configured to perform a low voltage ride-through capability verification, a high voltage ride-through capability verification, and a protection action reliability verification on the preset protection setting value based on the grid voltage amplitude curve, the grid connection point voltage amplitude curve, the reactive power output curve, the voltage recovery curve, and the action time, to obtain a verification result;

[0140] The protection setting value setting module is used to set the protection setting value of the protection device in the above-mentioned power grid according to the above-mentioned preset protection setting value when the above-mentioned verification result is reasonable.

[0141] In a preferred embodiment, the data acquisition module includes:

[0142] Electrical parameter acquisition unit, topology model building unit and simulation model building unit;

[0143] The electrical parameter acquisition unit is used to acquire the electrical parameters of each power element in the power grid; wherein the power elements include: busbar;

[0144] The topology model building unit is used to build a power grid topology model using the busbars as nodes and the connections between the busbars as edges;

[0145] The simulation model construction unit is configured to use the electrical parameters corresponding to the power components as the features of the nodes and edges to generate the preset power grid simulation topology model.

[0146] It should be noted that the device embodiment described above is merely illustrative, wherein the modules described above as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the drawings of the device embodiment provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement it without creative work. The above schematic diagram is only an example of a protection setting value calibration device for offshore wind power grid-related equipment, and does not constitute a limitation on a protection setting value calibration device for offshore wind power grid-related equipment. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components.

[0147] Based on the above method embodiment, the present invention provides a corresponding terminal device embodiment.

[0148] Another embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the above-mentioned memory and configured to be executed by the above-mentioned processor. When the above-mentioned processor executes the above-mentioned computer program, it implements the protection constant value calibration method of offshore wind power grid-related equipment described in any embodiment of the present invention.

[0149] For example, in this embodiment, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the device.

[0150] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, or a cloud server. The device may include, but is not limited to, a processor and a memory;

[0151] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor. The processor is the control center of the device, connecting the various parts of the device using various interfaces and lines.

[0152] The above-mentioned memory can be used to store the above-mentioned computer programs and / or modules. The above-mentioned processor realizes various functions of the above-mentioned device by running or executing the computer programs and / or modules stored in the above-mentioned memory, and calling the data stored in the memory. The above-mentioned memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; in addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0153] Based on the above method embodiment, the present invention provides a corresponding storage medium embodiment.

[0154] Another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute a protection constant value calibration method for offshore wind power grid-related equipment described in any embodiment of the present invention.

[0155] In this embodiment, the storage medium is a computer-readable storage medium, and the computer program includes computer program code, which may be in source code form, object code form, an executable file, or some intermediate form. The computer-readable medium may include any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium.

[0156] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for verifying protection values ​​of offshore wind power grid-related equipment, characterized in that: include: Obtain the preset power grid simulation topology model and the current operation data of the power grid; For each fault type, current operating data, a preset fault data set corresponding to the fault type, and a corresponding preset protection setting are input into the power grid simulation topology model, so that the power grid simulation topology model performs a fault simulation under the preset protection setting according to the fault data set and the current operating data, and obtains a grid voltage amplitude curve of the power grid, a grid connection point voltage amplitude curve of the wind turbine, a reactive power output curve of the wind turbine, a voltage recovery curve of the wind turbine, and an action time of a protection device in the power grid; Performing a low voltage ride-through capability check, a high voltage ride-through capability check, and a protection action reliability check on the preset protection setting according to the grid voltage amplitude curve, the grid connection point voltage amplitude curve, the reactive power output curve, the voltage recovery curve, and the action time, and obtaining a check result; When the verification result is reasonable, the protection setting value of the protection device in the power grid is set according to the preset protection setting value.

2. A protection setting value verification method for offshore wind power grid-related equipment according to claim 1, characterized in that: The construction of the preset power grid simulation topology model includes: Acquiring electrical parameters of each power element in the power grid; wherein the power element includes: a busbar; A power grid topology model is constructed by taking the busbars as nodes and the connections between the busbars as edges; The electrical parameters corresponding to each power element are used as the characteristics of the above nodes and edges to generate the preset power grid simulation topology model.

3. A method for verifying protection values ​​of offshore wind power grid-related equipment according to claim 2, characterized in that: The low voltage ride-through capability check, high voltage ride-through capability check, and protection action reliability check are performed on the preset protection setting value according to the grid voltage amplitude curve, the grid connection point voltage amplitude curve, the reactive power output curve, the voltage recovery curve, and the action time, and the check results are obtained, including: Extracting a first grid voltage amplitude curve during a voltage drop, a first grid voltage amplitude curve during a voltage increase, and a second grid voltage amplitude curve during a voltage increase from the grid voltage amplitude curve and the grid connection point voltage amplitude curve; Determining, according to the reactive power output curve, a first reactive power within a first preset period after a voltage drop occurs and a second reactive power within a second preset period after a voltage rise occurs; Extracting from the voltage recovery curve a first voltage recovery time of the wind turbine generator set after a voltage drop and a second voltage recovery time after a voltage increase; performing a low voltage ride-through capability check based on the first grid voltage amplitude curve, the first grid connection point voltage amplitude curve, the first reactive power, and the first voltage recovery time to obtain a low voltage ride-through check result; performing a high voltage ride through capability check based on the second grid voltage amplitude curve, the second grid connection point voltage amplitude curve, the second reactive power, and the second voltage recovery time to obtain a high voltage ride through capability check result; Performing a protection action reliability check based on the action time to obtain a protection action check result; If the low voltage ride-through verification result, the high voltage ride-through verification result, and the protection action verification result are all reasonable, the verification result is determined to be reasonable; otherwise, the verification result is determined to be unreasonable.

4. A method for verifying protection values ​​of offshore wind power grid-related equipment according to claim 3, characterized in that: The low voltage ride-through capability verification is performed according to the first grid voltage amplitude curve, the first grid connection point voltage amplitude curve, the first reactive power, and the first voltage recovery time to obtain a low voltage ride-through verification result, including: Calculating a first voltage amplitude deviation at each moment according to the first grid voltage amplitude curve and the first grid connection point voltage amplitude curve; When all first voltage amplitude deviations are less than the preset voltage amplitude threshold, it is determined that the grid-connected operation capability in the low voltage ride-through verification is reliable; When the first reactive power is greater than a preset first reactive power threshold, determining that the reactive support capability in the low voltage ride through check is reliable; When the first voltage recovery time does not exceed a first preset voltage recovery time threshold, determining that the voltage recovery capability in the low voltage ride-through check is reliable; If the grid-connected operation capability, reactive power support capability, and voltage recovery capability in the low voltage ride-through verification are reliable, the low voltage ride-through verification result is judged to be reasonable; otherwise, the low voltage ride-through verification result is judged to be unreasonable.

5. A method for verifying protection values ​​of offshore wind power grid-related equipment according to claim 4, characterized in that: A high voltage ride-through capability check is performed based on the second grid voltage amplitude curve, the second grid connection point voltage amplitude curve, the first reactive power, the second reactive power, and the second voltage recovery time, to obtain a high voltage ride-through check result, including: Calculating a second voltage amplitude deviation at each moment according to the second grid voltage amplitude curve and the second grid connection point voltage amplitude curve; When all the second voltage amplitude deviations are less than the preset voltage amplitude threshold, determining that the grid-connected operation capability in the high voltage ride-through verification is reliable; When the second reactive power is greater than a preset second reactive power threshold, determining that the reactive support capability in the high voltage ride through check is reliable; When the second voltage recovery time does not exceed a second preset voltage recovery time threshold, determining that the voltage recovery capability in the high voltage ride-through check is reliable; If the grid-connected operation capability, reactive power support capability, and voltage recovery capability in the high voltage ride-through verification are reliable, the high voltage ride-through verification result is judged to be reasonable; otherwise, the high voltage ride-through verification result is judged to be unreasonable.

6. A method for verifying protection settings of offshore wind power grid-related equipment according to claim 5, characterized in that: According to the action time, the reliability of the protection action is checked to obtain the protection action check result, including: If the action time exceeds the corresponding preset action time threshold, the protection action verification result is judged to be unreasonable; otherwise, the protection action verification result is judged to be reasonable.

7. A protection setting value verification device for offshore wind power grid-related equipment, characterized in that: include: Data acquisition module, simulation module, calibration result determination module and protection setting value setting module; The data acquisition module is used to obtain a preset power grid simulation topology model and current power grid operation data; The simulation module is configured to input, for each fault type, current operating data, a preset fault data set corresponding to the fault type, and a corresponding preset protection setting into the power grid simulation topology model, so that the power grid simulation topology model performs a fault simulation under the preset protection setting based on the fault data set and the current operating data, and obtains, in the power grid, a grid voltage amplitude curve of the power grid, a grid connection point voltage amplitude curve of the wind turbine, a reactive power output curve of the wind turbine, a voltage recovery curve of the wind turbine, and an action time of a protection device in the power grid; The verification result determination module is configured to perform a low voltage ride-through capability verification, a high voltage ride-through capability verification, and a protection action reliability verification on the preset protection setting value based on the grid voltage amplitude curve, the grid connection point voltage amplitude curve, the reactive power output curve, the voltage recovery curve, and the action time, to obtain a verification result; The protection setting value setting module is used to set the protection setting value of the protection device in the power grid according to the preset protection setting value when the verification result is reasonable.

8. A protection setting value checking device for offshore wind power grid-related equipment according to claim 7, characterized in that: The data acquisition module includes: Electrical parameter acquisition unit, topology model building unit and simulation model building unit; The electrical parameter acquisition unit is used to acquire electrical parameters of each power element in the power grid; wherein the power element includes: a busbar; The topology model construction unit is used to construct a power grid topology model using the busbars as nodes and the connections between the busbars as edges; The simulation model construction unit is used to use the electrical parameters corresponding to each power element as the characteristics of the above-mentioned nodes and edges to generate the preset power grid simulation topology model.

9. A terminal device, characterized in that: It includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements a protection setting value verification method for offshore wind power grid-related equipment as described in any one of claims 1 to 6.

10. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein, when the computer program is running, the device where the storage medium is located is controlled to execute a protection constant value verification method for offshore wind power grid-related equipment as described in any one of claims 1 to 6.

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