A trajectory-based method and apparatus for quantitative assessment of wind turbine safety

Abstract

This invention discloses a trajectory-based quantitative assessment method and apparatus for the safety of wind turbine generators. The method includes acquiring the voltage response trajectory of each wind farm's grid connection point under a anticipated fault; calculating a first safety margin of the wind turbine generator under low-voltage ride-through requirements based on the voltage response trajectory of the wind farm's grid connection point; calculating a second safety margin of the wind turbine generator under high-voltage ride-through requirements based on the voltage response trajectory of the wind farm's grid connection point; and calculating and obtaining the safety margin of the wind farm based on the first and second safety margins. This is used to assess the safety of the wind turbine generator under fault conditions. This invention can extract quantitative information based on the voltage disturbance trajectory of the wind farm's grid connection point, assess the safety of the wind turbine generator, provide quantitative indicators for the safe and stable control of new energy equipment and the power grid, and support the optimization decision-making of control strategies.

Description

[0001] Technical Field and Background Technology

[0002] This invention relates to a method and apparatus for quantitative assessment of the safety of wind turbine units based on trajectory, belonging to the field of power system stability analysis and control technology.

[0003] With the widespread integration of new equipment, the power system will exhibit the "dual high" characteristics of a high proportion of renewable energy and a high proportion of power electronic equipment, facing numerous challenges. New energy power generation, such as wind power, differs significantly from traditional power sources, exhibiting unique characteristics in fault prevention and handling strategies, as well as control strategies. Due to the numerous control components of power electronic equipment and the varying control parameters and responses of different devices, mathematical derivation is extremely difficult. Most analyses rely on simulation methods, but current safety analyses of this type of equipment remain qualitative, further complicating the analysis and control process. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a trajectory-based method and device for quantitative assessment of the safety of wind turbine units. This method assesses the ability of wind turbine units to maintain safe grid-connected operation under fault conditions, provides quantitative indicators for the safe and stable control of new energy equipment and large power grids, and supports the optimization decision-making of control strategies.

[0005] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0006] In a first aspect, the present invention provides a trajectory-based method for quantitatively assessing the safety of wind turbine generators, comprising:

[0007] Obtain the voltage response trajectory of each wind farm's grid connection point under the anticipated fault;

[0008] Based on the voltage response trajectory at the grid connection point of the wind farm, calculate the first safety margin of the wind turbine under the constraint of low voltage ride-through requirements.

[0009] Based on the voltage response trajectory at the grid connection point of the wind farm, the second safety margin of the wind turbine under the constraint of high voltage ride-through requirements is calculated.

[0010] The safety margin of the wind farm is calculated based on the first and second safety margins, and is used to assess the safety of the wind turbine units under fault conditions.

[0011] Furthermore, the voltage response trajectory of each wind farm's grid connection point under the anticipated fault is obtained in advance through time-domain simulation after simulating the anticipated fault.

[0012] Furthermore, the first safety margin includes the safety margin for the wind farm to maintain safe operation after a successful low-voltage ride-through and the safety margin for the wind farm to disconnect from the grid due to a failed low-voltage ride-through, wherein:

[0013] When a wind turbine successfully completes a low-voltage ride-through and remains connected to the grid, maintaining safe operation, the safety margin calculation formula is as follows:

[0014]

[0015] Where, η L_i_s Let i be the safety margin that allows the wind farm to maintain safe operation after a successful low-voltage ride-through, and let T be the safety margin. _s within the time window η L_i_s The minimum value of (t); t is any time after the fault; η L_i_s (t) represents the safety margin at time t for wind farm i to maintain grid-connected operation due to successful low-voltage ride-through; u i (t) represents the grid connection voltage of wind farm i at time t; u L_set (t) represents the voltage at time t corresponding to the low-voltage ride-through requirement of the wind farm; u ref This is the reference voltage during normal operation of the wind farm.

[0016] When a wind farm turbine fails to ride a low-voltage ride-through and disconnects from the grid, making safe operation impossible, the safety margin calculation formula is as follows:

[0017]

[0018] Where, η L_i_f T represents the safety margin when a wind farm i disconnects from the grid due to a low-voltage ride-through failure; L_i_int The moment T is the point where the voltage response trajectory at the grid connection point of wind farm i intersects with the low-voltage ride-through requirement curve; L_set This is the set percentage of time required for the grid connection voltage of a wind farm to recover to the rated voltage after a voltage drop, in accordance with the low voltage ride-through requirements of wind farms.

[0019] Furthermore, the second safety margin includes the safety margin for maintaining safe operation when the wind farm successfully completes a high-voltage ride-through and the safety margin for when the wind farm disconnects from the grid due to a high-voltage ride-through failure, wherein:

[0020] When a wind turbine successfully completes a high-voltage ride-through and remains connected to the grid, maintaining safe operation, the safety margin calculation formula is as follows:

[0021]

[0022] Where, η H_i_s The safety margin for maintaining safe operation of wind farm i after successful high-voltage ride-through; t is any moment after the fault; η H_i_s (t) represents the safety margin at time t that wind farm i can maintain grid-connected operation due to successful high-voltage ride-through; u H_set(t) represents the voltage at time t corresponding to the high-voltage ride-through requirement of the wind farm;

[0023] When a wind farm turbine fails to ride a high voltage, disconnects from the grid, and cannot maintain safe operation, the safety margin calculation formula is as follows:

[0024]

[0025] Where, η H_i_f T represents the safety margin when a wind farm i disconnects from the grid due to a high-voltage ride-through failure; H_i_int The moment T is the point in time where the voltage response trajectory at the grid connection point of wind farm i intersects with the high-voltage ride-through requirement curve; H_set To meet the high voltage ride-through requirements of wind farms, when the voltage at the grid connection point of a wind farm rises to a set percentage range of the nominal voltage, the wind turbines in the wind farm should be guaranteed to operate continuously without disconnecting from the grid for a certain period of time.

[0026] Furthermore, the safety margin of the wind farm is calculated based on the first safety margin and the second safety margin, using the following formula:

[0027] When fault ride-through is successful and the wind turbines are able to connect to the grid, the safety margin of the wind farm is calculated using the following formula:

[0028] η i =min[η L_i_s ,η H_i_s (5)

[0029] When fault ride-through fails and the unit disconnects from the grid, the safety margin of the wind farm is calculated using the following formula:

[0030] η i =min[η L_i_f ,η H_i_f (6)

[0031] In the formula, η i This represents the safety margin for wind farm i.

[0032] Secondly, the present invention provides a trajectory-based wind turbine safety quantitative assessment device, comprising:

[0033] The acquisition module is used to acquire the voltage response trajectory of each wind farm's grid connection point under the anticipated fault.

[0034] The first calculation module is used to calculate the first safety margin of the wind turbine under the constraint of low voltage ride-through requirements based on the voltage response trajectory of the wind farm grid connection point.

[0035] The second calculation module is used to calculate the second safety margin of the wind turbine under the constraint of high voltage ride-through requirements based on the voltage response trajectory of the wind farm grid connection point.

[0036] The third calculation module is used to calculate the safety margin of the wind farm based on the first safety margin and the second safety margin, and to evaluate the safety of the wind turbine units under fault conditions.

[0037] Furthermore, in the acquisition module, the voltage response trajectory of each wind farm grid connection point under the anticipated fault is obtained in advance through time-domain simulation after simulating the anticipated fault.

[0038] Furthermore, in the first calculation module, the first safety margin includes the safety margin for the wind farm to maintain safe operation after a successful low-voltage ride-through and the safety margin for the wind farm to disconnect from the grid due to a failed low-voltage ride-through, wherein:

[0039] When a wind turbine successfully completes a low-voltage ride-through and remains connected to the grid, maintaining safe operation, the safety margin calculation formula is as follows:

[0040]

[0041] Where, η L_i_s Let i be the safety margin that allows the wind farm to maintain safe operation after a successful low-voltage ride-through, and let T be the safety margin. _s within the time window η L_i_s The minimum value of (t); t is any time after the fault; η L_i_s (t) represents the safety margin at time t for wind farm i to maintain grid-connected operation due to successful low-voltage ride-through; u i (t) represents the grid connection voltage of wind farm i at time t; u L_set (t) represents the voltage at time t corresponding to the low-voltage ride-through requirement of the wind farm; u ref This is the reference voltage during normal operation of the wind farm.

[0042] When a wind farm turbine fails to ride a low-voltage ride-through and disconnects from the grid, making safe operation impossible, the safety margin calculation formula is as follows:

[0043]

[0044] Where, η L_i_f T represents the safety margin when a wind farm i disconnects from the grid due to a low-voltage ride-through failure; L_i_int The moment T is the point where the voltage response trajectory at the grid connection point of wind farm i intersects with the low-voltage ride-through requirement curve; L_set This is the set percentage of time required for the grid connection voltage of a wind farm to recover to the rated voltage after a voltage drop, in accordance with the low voltage ride-through requirements of wind farms.

[0045] Furthermore, in the second calculation module, the second safety margin includes the safety margin for maintaining safe operation when the wind farm successfully completes a high-voltage ride-through and the safety margin for when the wind farm disconnects from the grid due to a high-voltage ride-through failure, wherein:

[0046] When a wind turbine successfully completes a high-voltage ride-through and remains connected to the grid, maintaining safe operation, the safety margin calculation formula is as follows:

[0047]

[0048] Where, η H_i_s The safety margin for maintaining safe operation of wind farm i after successful high-voltage ride-through; t is any moment after the fault; η H_i_s (t) represents the safety margin at time t that wind farm i can maintain grid-connected operation due to successful high-voltage ride-through; u H_set (t) represents the voltage at time t corresponding to the high-voltage ride-through requirement of the wind farm;

[0049] When a wind farm turbine fails to ride a high voltage, disconnects from the grid, and cannot maintain safe operation, the safety margin calculation formula is as follows:

[0050]

[0051] Where, η H_i_f T represents the safety margin when a wind farm i disconnects from the grid due to a high-voltage ride-through failure; H_i_int The moment T is the point in time where the voltage response trajectory at the grid connection point of wind farm i intersects with the high-voltage ride-through requirement curve; H_set To meet the high voltage ride-through requirements of wind farms, when the voltage at the grid connection point of a wind farm rises to a set percentage range of the nominal voltage, the wind turbines in the wind farm should be guaranteed to operate continuously without disconnecting from the grid for a certain period of time.

[0052] Furthermore, in the third calculation module, the safety margin of the wind farm is calculated based on the first safety margin and the second safety margin, using the following formula:

[0053] When fault ride-through is successful and the wind turbines are able to connect to the grid, the safety margin of the wind farm is calculated using the following formula:

[0054] η i =min[η L_i_s ,η H_i_s (5)

[0055] When fault ride-through fails and the unit disconnects from the grid, the safety margin of the wind farm is calculated using the following formula:

[0056] η i =min[η L_i_f ,η H_i_f (6)

[0057] In the formula, η i This represents the safety margin for wind farm i.

[0058] Thirdly, the present invention provides an electronic device, including a processor and a storage medium;

[0059] The storage medium is used to store instructions;

[0060] The processor is configured to operate according to the instructions to perform the steps of the method according to any of the preceding claims.

[0061] Fourthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the preceding methods.

[0062] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0063] This invention provides a trajectory-based quantitative assessment method and device for the safety of wind turbine generators. It can extract quantitative information based on the voltage disturbance trajectory at the grid connection point of a wind farm, assess the safety of wind turbine generators, provide quantitative indicators for the safe and stable control of new energy equipment and the power grid, and support the optimization decision-making of control strategies. Attached Figure Description

[0064] Figure 1 This is a flowchart of a trajectory-based quantitative assessment method for the safety of wind turbine generators provided in an embodiment of the present invention. Detailed Implementation

[0065] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0066] Example 1

[0067] This embodiment introduces a trajectory-based quantitative assessment method for the safety of wind turbine generators, including:

[0068] Obtain the voltage response trajectory of each wind farm's grid connection point under the anticipated fault;

[0069] Based on the voltage response trajectory at the grid connection point of the wind farm, calculate the first safety margin of the wind turbine under the constraint of low voltage ride-through requirements.

[0070] Based on the voltage response trajectory at the grid connection point of the wind farm, the second safety margin of the wind turbine under the constraint of high voltage ride-through requirements is calculated.

[0071] The safety margin of the wind farm is calculated based on the first and second safety margins, and is used to assess the safety of the wind turbine units under fault conditions.

[0072] like Figure 1 As shown in the figure, the trajectory-based wind turbine safety quantitative assessment method provided in this embodiment involves the following steps in its application process:

[0073] Step 1: Based on time-domain simulation, simulate the expected fault and obtain the voltage response trajectory of each wind farm grid connection point under the expected fault.

[0074] Step 2: Calculate the safety margin of wind turbines under the constraints of low voltage ride-through requirements:

[0075] (1) When the wind turbine successfully completes low-voltage ride-through, the unit does not disconnect from the grid and can maintain safe operation:

[0076]

[0077] (2) When the wind farm unit fails to ride the low voltage, the unit disconnects from the grid and cannot maintain safe operation:

[0078]

[0079] In the formula, η L_i_s Let i be the safety margin that allows the wind farm to maintain safe operation after a successful low-voltage ride-through, and let T be the safety margin. _s within the time window η L_i_s The minimum value of (t); η L_i_f η represents the safety margin when wind farm i disconnects from the grid due to a low-voltage ride-through failure; t represents any time after the fault (with the fault time as time 0); η L_i_s (t) represents the safety margin at time t for wind farm i to maintain grid-connected operation due to successful low-voltage ride-through; u i (t) represents the grid connection voltage of wind farm i at time t; u L_set (t) represents the voltage at time t corresponding to the low-voltage ride-through requirement of the wind farm; u ref This is the reference voltage for normal operation of the wind farm (generally taken as 1.0); T L_i_int The moment T is the point where the voltage response trajectory at the grid connection point of wind farm i intersects with the low-voltage ride-through requirement curve; L_set To meet the low-voltage ride-through requirements of wind farms, the time required for the grid connection voltage of a wind farm to recover to 90% of its rated voltage after a voltage dip is specified in GB / T19963.1-2021. L_set Take 2 seconds.

[0080] Step 3: Calculate the safety margin of wind turbines under the constraints of high-voltage ride-through requirements:

[0081] (1) When the wind turbine successfully completes high-voltage ride-through, the unit does not disconnect from the grid and can maintain safe operation:

[0082]

[0083] (2) When the high-voltage ride-through of the wind farm unit fails, the unit disconnects from the grid and cannot maintain safe operation:

[0084]

[0085] In the formula, η H_i_s To ensure the safety margin for wind farms to maintain safe operation during successful high-voltage ride-through, and for T _s within the time window η H_i_s The minimum value of (t); η H_i_f η represents the safety margin when wind farm i disconnects from the grid due to high-voltage ride-through failure; t represents any time after the fault (with the fault time as time 0); η H_i_s (t) represents the safety margin at time t that wind farm i can maintain grid-connected operation due to successful high-voltage ride-through; u H_set (t) represents the voltage at time t corresponding to the high-voltage ride-through requirement of the wind farm; T H_i_int The moment T is the point in time where the voltage response trajectory at the grid connection point of wind farm i intersects with the high-voltage ride-through requirement curve; H_set To meet the high-voltage ride-through requirements of wind farms, when the grid connection voltage of a wind farm rises to between 110% and 120% of the nominal voltage, the wind turbines within the wind farm must ensure continuous operation without disconnecting from the grid for a specified period. This is in accordance with GB / T 19963.1-2021. H_set Take 10 seconds.

[0086] Step 4: Methods for assessing the safety of wind turbine units:

[0087] The safety of wind turbines under fault conditions is assessed based on whether they can successfully ride through the fault. The specific safety margin is determined as follows:

[0088] When fault ride-through is successful and the wind turbines are able to connect to the grid, the safety margin of the wind farm is calculated using the following formula:

[0089] η i =min[η L_i_s ,η H_i_s (5)

[0090] When fault ride-through fails and the unit disconnects from the grid, the safety margin of the wind farm is calculated using the following formula:

[0091] η i =min[η L_i_f ,η H_i_f (6)

[0092] In the formula, η i This represents the safety margin for wind farm i.

[0093] This invention provides a trajectory-based quantitative assessment method for the safety of wind turbine generators. It can extract quantitative information based on the voltage disturbance trajectory at the grid connection point of a wind farm, assess the safety of wind turbine generators, provide quantitative indicators for the safe and stable control of new energy equipment and the power grid, and support the optimization decision-making of control strategies.

[0094] Example 2

[0095] This embodiment provides a trajectory-based wind turbine safety quantitative assessment device, including:

[0096] The acquisition module is used to acquire the voltage response trajectory of each wind farm's grid connection point under the anticipated fault.

[0097] The first calculation module is used to calculate the first safety margin of the wind turbine under the constraint of low voltage ride-through requirements based on the voltage response trajectory of the wind farm grid connection point.

[0098] The second calculation module is used to calculate the second safety margin of the wind turbine under the constraint of high voltage ride-through requirements based on the voltage response trajectory of the wind farm grid connection point.

[0099] The third calculation module is used to calculate the safety margin of the wind farm based on the first safety margin and the second safety margin, and to evaluate the safety of the wind turbine units under fault conditions.

[0100] Specifically, in the acquisition module, the voltage response trajectory of each wind farm grid connection point under the expected fault is obtained in advance through time-domain simulation after simulating the expected fault.

[0101] Specifically, in the first calculation module, the first safety margin includes the safety margin for a wind farm to maintain safe operation after a successful low-voltage ride-through and the safety margin for a wind farm to disconnect from the grid due to a failed low-voltage ride-through, wherein:

[0102] When a wind turbine successfully completes a low-voltage ride-through and remains connected to the grid, maintaining safe operation, the safety margin calculation formula is as follows:

[0103]

[0104] Where, η L_i_s Let i be the safety margin that allows the wind farm to maintain safe operation after a successful low-voltage ride-through, and let T be the safety margin. _s within the time window η L_i_s The minimum value of (t); t is any time after the fault; η L_i_s (t) represents the safety margin at time t for wind farm i to maintain grid-connected operation due to successful low-voltage ride-through; u i (t) represents the grid connection voltage of wind farm i at time t; u L_set (t) represents the voltage at time t corresponding to the low-voltage ride-through requirement of the wind farm; uref This is the reference voltage during normal operation of the wind farm.

[0105] When a wind farm turbine fails to ride a low-voltage ride-through and disconnects from the grid, making safe operation impossible, the safety margin calculation formula is as follows:

[0106]

[0107] Where, η L_i_f T represents the safety margin when a wind farm i disconnects from the grid due to a low-voltage ride-through failure; L_i_int The moment T is the point where the voltage response trajectory at the grid connection point of wind farm i intersects with the low-voltage ride-through requirement curve; L_set This is the set percentage of time required for the grid connection voltage of a wind farm to recover to the rated voltage after a voltage drop, in accordance with the low voltage ride-through requirements of wind farms.

[0108] Specifically, in the second calculation module, the second safety margin includes the safety margin for maintaining safe operation when the wind farm successfully completes a high-voltage ride-through and the safety margin for when the wind farm disconnects from the grid due to a high-voltage ride-through failure, wherein:

[0109] When a wind turbine successfully completes a high-voltage ride-through and remains connected to the grid, maintaining safe operation, the safety margin calculation formula is as follows:

[0110]

[0111] Where, η H_i_s The safety margin for maintaining safe operation of wind farm i after successful high-voltage ride-through; t is any moment after the fault; η H_i_s (t) represents the safety margin at time t that wind farm i can maintain grid-connected operation due to successful high-voltage ride-through; u H_set (t) represents the voltage at time t corresponding to the high-voltage ride-through requirement of the wind farm;

[0112] When a wind farm turbine fails to ride a high voltage, disconnects from the grid, and cannot maintain safe operation, the safety margin calculation formula is as follows:

[0113]

[0114] Where, η H_i_f T represents the safety margin when a wind farm i disconnects from the grid due to a high-voltage ride-through failure; H_i_int The moment T is the point in time where the voltage response trajectory at the grid connection point of wind farm i intersects with the high-voltage ride-through requirement curve; H_set To meet the high voltage ride-through requirements of wind farms, when the voltage at the grid connection point of a wind farm rises to a set percentage range of the nominal voltage, the wind turbines in the wind farm should be guaranteed to operate continuously without disconnecting from the grid for a certain period of time.

[0115] Specifically, in the third calculation module, the safety margin of the wind farm is calculated based on the first safety margin and the second safety margin, using the following formula:

[0116] When fault ride-through is successful and the wind turbines are able to connect to the grid, the safety margin of the wind farm is calculated using the following formula:

[0117] η i =min[η L_i_s ,η H_i_s (5)

[0118] When fault ride-through fails and the unit disconnects from the grid, the safety margin of the wind farm is calculated using the following formula:

[0119] η i =min[η L_i_f ,η H_i_f (6)

[0120] In the formula, η i This represents the safety margin for wind farm i.

[0121] Example 3

[0122] This embodiment provides an electronic device, including a processor and a storage medium;

[0123] The storage medium is used to store instructions;

[0124] The processor is configured to operate according to the instructions to perform the steps of the method according to any one of Embodiment 1.

[0125] Example 4

[0126] This embodiment provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described in Embodiment 1.

[0127] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A trajectory-based quantitative assessment method for the safety of wind turbine generators, characterized in that, include: Obtain the voltage response trajectory of each wind farm's grid connection point under the anticipated fault; Based on the voltage response trajectory at the grid connection point of the wind farm, calculate the first safety margin of the wind turbine under the constraint of low voltage ride-through requirements. The first safety margin includes the safety margin for a wind farm to maintain safe operation after a successful low-voltage ride-through and the safety margin for a wind farm to disconnect from the grid due to a failed low-voltage ride-through, wherein: When a wind turbine successfully completes a low-voltage ride-through and remains connected to the grid, maintaining safe operation, the safety margin calculation formula is as follows: （1）； in, Let i be the safety margin that allows the wind farm to maintain safe operation after a successful low-voltage ride-through, and let T be the safety margin. _s Within the time window The minimum value; t is any time after the fault; The wind farm i is able to maintain a safety margin at time t during grid-connected operation due to successful low-voltage ride-through; Let be the voltage at the grid connection point of wind farm i at time t; The voltage at time t is the low-voltage ride-through requirement for a wind farm. This is the reference voltage during normal operation of the wind farm. When a wind farm turbine fails to ride a low-voltage ride-through and disconnects from the grid, making safe operation impossible, the safety margin calculation formula is as follows: （2）； in, This refers to the safety margin when wind farm i is disconnected from the grid due to a low-voltage ride-through failure. The moment when the voltage response trajectory at the grid connection point of wind farm i intersects with the low-voltage ride-through requirement curve; This refers to the set percentage of time required for the grid connection voltage of a wind farm to recover to its rated voltage after a voltage drop, in accordance with the low voltage ride-through requirements of wind farms. Based on the voltage response trajectory at the grid connection point of the wind farm, the second safety margin of the wind turbine under the constraint of high voltage ride-through requirements is calculated. The safety margin of the wind farm is calculated based on the first and second safety margins, and is used to assess the safety of the wind turbine units under fault conditions.

2. The method for quantitative safety assessment of wind turbine units based on trajectory according to claim 1, characterized in that, The voltage response trajectories of each wind farm's grid connection point under the anticipated fault were obtained in advance through time-domain simulation after simulating the anticipated fault.

3. The method for quantitative safety assessment of wind turbine units based on trajectory according to claim 1, characterized in that, The second safety margin includes the safety margin for maintaining safe operation when the wind farm successfully completes a high-voltage ride-through and the safety margin for when the wind farm disconnects from the grid due to a high-voltage ride-through failure, wherein: When a wind turbine successfully completes a high-voltage ride-through and remains connected to the grid, maintaining safe operation, the safety margin calculation formula is as follows: （3）； in, The safety margin that allows the wind farm to maintain safe operation after a successful high-voltage ride-through; t is any moment after the fault. The wind farm i is able to maintain a safety margin at time t during grid-connected operation due to successful high-voltage ride-through; The voltage at time t is the requirement for high-voltage ride-through of a wind farm. When a wind farm turbine fails to ride a high voltage, disconnects from the grid, and cannot maintain safe operation, the safety margin calculation formula is as follows: （4）； in, This refers to the safety margin when wind farm i is disconnected from the grid due to high-voltage ride-through failure. The moment when the voltage response trajectory at the grid connection point of wind farm i intersects with the high-voltage ride-through requirement curve; To meet the high voltage ride-through requirements of wind farms, when the voltage at the grid connection point of a wind farm rises to a set percentage range of the nominal voltage, the wind turbines in the wind farm should be guaranteed to operate continuously without disconnecting from the grid for a certain period of time.

4. The trajectory-based quantitative assessment method for wind turbine safety according to claim 3, characterized in that, The safety margin of the wind farm is calculated based on the first safety margin and the second safety margin, using the following formula: When fault ride-through is successful and the wind turbines are able to connect to the grid, the safety margin of the wind farm is calculated using the following formula: （5）； When fault ride-through fails and the unit disconnects from the grid, the safety margin of the wind farm is calculated using the following formula: （6）； Where, This represents the safety margin for wind farm i.

5. A trajectory-based quantitative assessment device for the safety of wind turbine generators, characterized in that, include: The acquisition module is used to acquire the voltage response trajectory of each wind farm's grid connection point under the anticipated fault. The first calculation module is used to calculate the first safety margin of the wind turbine under the constraint of low voltage ride-through requirements based on the voltage response trajectory of the wind farm grid connection point. The first safety margin includes the safety margin for a wind farm to maintain safe operation after a successful low-voltage ride-through and the safety margin for a wind farm to disconnect from the grid due to a failed low-voltage ride-through, wherein: When a wind turbine successfully completes a low-voltage ride-through and remains connected to the grid, maintaining safe operation, the safety margin calculation formula is as follows: （1）； in, Let i be the safety margin that allows the wind farm to maintain safe operation after a successful low-voltage ride-through, and let T be the safety margin. _s Within the time window The minimum value; t is any time after the fault; The wind farm i is able to maintain a safety margin at time t during grid-connected operation due to successful low-voltage ride-through; Let be the voltage at the grid connection point of wind farm i at time t; The voltage at time t is the low-voltage ride-through requirement for a wind farm. This is the reference voltage during normal operation of the wind farm. When a wind farm turbine fails to ride a low-voltage circuit and disconnects from the grid, making safe operation impossible, the safety margin calculation formula is as follows: （2）； in, This refers to the safety margin when wind farm i is disconnected from the grid due to a low-voltage ride-through failure. The moment when the voltage response trajectory at the grid connection point of wind farm i intersects with the low-voltage ride-through requirement curve; This refers to the set percentage of time required for the grid connection voltage of a wind farm to recover to its rated voltage after a voltage drop, in accordance with the low voltage ride-through requirements of wind farms. The second calculation module is used to calculate the second safety margin of the wind turbine under the constraint of high voltage ride-through requirements based on the voltage response trajectory of the wind farm grid connection point. The third calculation module is used to calculate the safety margin of the wind farm based on the first safety margin and the second safety margin, and to evaluate the safety of the wind turbine units under fault conditions.

6. The trajectory-based quantitative assessment method for wind turbine safety according to claim 5, characterized in that, In the acquisition module, the voltage response trajectory of each wind farm grid connection point under the expected fault is obtained in advance through time-domain simulation after simulating the expected fault.

7. The trajectory-based quantitative assessment method for wind turbine safety according to claim 5, characterized in that, In the second calculation module, the second safety margin includes the safety margin for maintaining safe operation when the wind farm successfully completes a high-voltage ride-through and the safety margin for when the wind farm disconnects from the grid due to a high-voltage ride-through failure, wherein: When a wind turbine successfully completes a high-voltage ride-through and remains connected to the grid, maintaining safe operation, the safety margin calculation formula is as follows: （3）； in, The safety margin that allows the wind farm to maintain safe operation after a successful high-voltage ride-through; t is any moment after the fault. The wind farm i is able to maintain a safety margin at time t during grid-connected operation due to successful high-voltage ride-through; The voltage at time t is the requirement for high-voltage ride-through of a wind farm. When a wind farm turbine fails to ride a high voltage, disconnects from the grid, and cannot maintain safe operation, the safety margin calculation formula is as follows: （4）； in, This refers to the safety margin when wind farm i is disconnected from the grid due to high-voltage ride-through failure. The moment when the voltage response trajectory at the grid connection point of wind farm i intersects with the high-voltage ride-through requirement curve; To meet the high voltage ride-through requirements of wind farms, when the voltage at the grid connection point of a wind farm rises to a set percentage range of the nominal voltage, the wind turbines in the wind farm should be guaranteed to operate continuously without disconnecting from the grid for a certain period of time.

8. The trajectory-based quantitative assessment method for wind turbine safety according to claim 7, characterized in that, In the third calculation module, the safety margin of the wind farm is calculated based on the first safety margin and the second safety margin, using the following formula: When fault ride-through is successful and the wind turbines are able to connect to the grid, the safety margin of the wind farm is calculated using the following formula: （5）； When fault ride-through fails and the unit disconnects from the grid, the safety margin of the wind farm is calculated using the following formula: （6）； In the formula, This represents the safety margin for wind farm i.

9. An electronic device, characterized in that: Including processor and storage media; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 1 to 4.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by the processor, it implements the steps of the method according to any one of claims 1 to 4.

Images