Test system and method for realizing wind turbine nacelle differential protection using optical fiber

Abstract

The present invention discloses a testing system and method for realizing wind turbine nacelle differential protection by utilizing optical fiber, and relates to the technical field of wind turbine nacelle differential protection testing, comprising the following steps: performing a normal operating condition test on the nacelle to verify whether a protection device operates normally; performing an internal fault test and an external fault test on the nacelle based on different environmental conditions, and recording the action time of the protection device during each test; analyzing whether the action time of the protection device complies with industry standards; and analyzing whether the action time is stable. The present invention is used to solve the problem that the existing wind turbine nacelle differential protection testing technology still has the problem that the protection device is not fully tested, resulting in the test result being very prone to errors.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine nacelle variable differential protection testing, and in particular to a wind turbine nacelle variable differential protection testing system and method using optical fiber. Background Art

[0002] The testing technology of wind turbine nacelle transformer differential protection refers to a technology used to test whether the protection device that protects the transformer inside the wind turbine is normal. The protection device is designed to monitor the current difference between the transformer windings to detect possible internal faults such as short circuits or ground faults. Once an abnormal current difference is detected, the transformer differential protection system will trigger an action signal to cut off the fault circuit, thereby protecting the safe operation of the transformer and the entire wind turbine system.

[0003] The existing wind turbine nacelle transformer differential protection test technology usually only detects whether the action time of the protection device meets the industry standard. However, wind turbines are affected by environmental conditions and have a variety of different working environments. The working environment will affect the power output of the wind turbine, and then affect the current and voltage in the circuit. If the impact of environmental conditions is not considered and only a single action time is analyzed, it is very easy to cause errors in the test results. Therefore, it is necessary to comprehensively analyze whether the action time of the protection device in different environmental conditions meets the industry standard. The environmental conditions of the wind turbine are affected by the wind speed. We cannot control the wind speed during the actual test, so it is difficult to conduct a comprehensive test on it. For example, in the patent application with publication number CN 108614213 A, a polarity test method for the differential protection of the generator-transformer group is disclosed. The solution is not comprehensive enough for the test process of the differential protection device, and does not accurately test whether the action time meets the industry standard. At the same time, it does not consider whether the differential protection device is still qualified under different environmental conditions, which leads to errors in the test results. The existing wind turbine nacelle transformer differential protection test technology also has the problem that the protection device is not comprehensively tested, which leads to errors in the test results. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the prior art to a certain extent, by performing a normal operating condition test on the cabin to verify whether the protection device is operating normally, then performing an internal fault test on the cabin based on different environmental conditions, recording the action time of the protection device during each test, and performing an external fault test on the cabin based on different environmental conditions to observe whether the protection device correctly shields the external fault signal, then analyzing whether the action time of the protection device meets the industry standards, and finally analyzing whether the action time is stable, so as to solve the problem that the existing wind turbine cabin variable differential protection testing technology still has the problem of not performing comprehensive testing on the protection device, resulting in the test results being very prone to errors.

[0005] To achieve the above objectives, in a first aspect, the present application provides a method for testing wind turbine nacelle variable differential protection using optical fiber, comprising the following steps:

[0006] Conduct normal operating condition tests on the engine room to verify whether the protection devices are operating normally;

[0007] Conduct internal fault tests and external fault tests on the nacelle based on different environmental conditions, and record the action time of the protection device during each test;

[0008] Analyze whether the action time of the protection device meets the industry standards;

[0009] Analyze whether the action time is stable.

[0010] Furthermore, the normal operating condition test of the nacelle to verify whether the protection device operates normally includes the following sub-steps:

[0011] Obtaining the rated operating current of the nacelle of the wind turbine generator set, and injecting the rated operating current into the nacelle for a first operating duration;

[0012] Observe whether the protection device is in operation and check whether the protection device sends an alarm signal. If the protection device is in operation and does not send an alarm signal, output a normal operation signal; otherwise, output an abnormal operation signal.

[0013] If an abnormal operation signal is output, the maintenance end is notified to perform maintenance on the protection device.

[0014] Furthermore, performing internal fault tests and external fault tests on the nacelle based on different environmental conditions and recording the action time of the protection device during each test includes the following sub-steps:

[0015] Conduct internal fault tests on the nacelle based on different environmental conditions and record the action time of the protection device during each test;

[0016] Perform external fault tests on the cabin based on different environmental conditions to observe whether the protection device correctly shields the external fault signal.

[0017] Furthermore, performing internal fault tests on the nacelle based on different environmental conditions and recording the action time of the protection device during each test includes the following sub-steps:

[0018] Simulate the phase-to-phase short circuit inside the cabin, inject the differential current, and obtain the time of injecting the differential current, which is named as the signal input time and represented by the symbol T1;

[0019] The time when the protection device outputs a fault signal is obtained, named as the signal output time, represented by the symbol T2, and at the same time, whether the protection device has started the tripping action is observed. If so, a normal operation signal is output; if not, an abnormal operation signal is output; if an abnormal operation signal is output, the maintenance end is notified to perform maintenance on the protection device;

[0020] Calculate T2-T1 to get the action time of the protection device;

[0021] Query the minimum and maximum wind speeds of wind turbines in operation in the historical records, which are named minimum wind speed and maximum wind speed respectively;

[0022] Set the first number of operating condition difference groups, represented by the symbol P n Indicates that the values ​​between the lowest wind speed and the highest wind speed are divided into the first number of arithmetic progressions, and the values ​​in the arithmetic progressions are sorted from small to large and numbered F n , where n is a positive integer and 1≤n≤the first quantity, and n is the sequence number of P and F;

[0023] P n The wind speed is set to F n , converting wind speed into actual power of wind turbines to configure different environmental conditions.

[0024] Furthermore, converting the wind speed into the actual power of the wind turbine generator set to configure different environmental conditions includes the following sub-steps:

[0025] Get the rotor blade area of ​​the wind turbine, marked as A, get the wind energy utilization coefficient of the wind turbine, marked as Cp, get the air density, marked as ρ, and use the formula U n =0.5×ρ×A×F n 2 ×Cp, calculate P n The actual power, where U n P n The actual power;

[0026] For P n , the output power of the wind turbine is simulated by electronic load and power supply as U n , and inject differential current into the cabin through secondary circuit test, record the action time, each P n A first amount of action time is collected.

[0027] Furthermore, performing an external fault test on the nacelle based on different environmental conditions to observe whether the protection device correctly shields the external fault signal includes the following sub-steps:

[0028] In each P n The fault current not related to the nacelle is injected in the middle;

[0029] If the protection device does not respond, it outputs a shielding normal signal, otherwise it outputs a shielding abnormal signal;

[0030] If the output shielding abnormal signal is output, the maintenance end is notified to perform maintenance on the protection device.

[0031] Furthermore, analyzing whether the action time of the protection device complies with the industry standard includes the following sub-steps:

[0032] Get the industry standard for the action time of the protection device, named standard reaction time;

[0033] Determine whether there is an action time greater than the standard reaction time among all the recorded action times. If so, output a non-compliant reaction signal; otherwise, output a compliant reaction signal.

[0034] If the output responds to an unqualified signal, the maintenance end is notified to perform maintenance on the protection device.

[0035] Furthermore, analyzing whether the action time is stable includes the following sub-steps:

[0036] For any P n , sort the recorded action times in ascending order and number them to obtain T(n,m), where m is a positive integer and 1≤m≤the first number, and (n,m) is the sequence number of T;

[0037] A plane rectangular coordinate system is established with m as the X-axis and the action time as the Y-axis, named the action stability analysis diagram, and T(n,m) is entered into the action stability analysis diagram according to m;

[0038] Perform linear regression analysis on the motion stability analysis graph, and name the function obtained by regression as the motion stability analysis function;

[0039] Obtain the standard deviation of the motion stability analysis function and name it as the motion stability reference value;

[0040] Analyze whether the action time of the protection device is stable based on the action stability reference value.

[0041] Further, analyzing whether the action time of the protection device is stable based on the action stability reference value includes the following sub-steps:

[0042] Get the yield rate of the protection device, represented by the symbol H;

[0043] Randomly select a second number of protection devices to test their action stability reference values;

[0044] Sort the action stability reference values ​​from small to large, select the top H action stability reference values, and name them as stable action values;

[0045] Find the maximum value among the stable action values ​​and name it as the action stability threshold;

[0046] The motion stability reference value obtained by actual analysis is compared with the motion stability threshold. If the motion stability reference value is less than or equal to the motion stability threshold, a motion stability signal is output; otherwise, an motion instability signal is output;

[0047] If the output action is unstable, the maintenance end will be notified to perform maintenance on the protection device.

[0048] In a second aspect, the present application provides a test system for realizing wind turbine nacelle variable differential protection using optical fiber, including a normal operating condition test module, a fault test module, a standard comparison module and a stability analysis module; the normal operating condition test module, the standard comparison module and the stability analysis module are respectively connected to the fault test module data;

[0049] The normal operating condition test module is used to perform a normal operating condition test on the cabin to verify whether the protection device operates normally;

[0050] The fault test module is used to perform internal fault tests and external fault tests on the nacelle based on different environmental conditions, and record the action time of the protection device during each test;

[0051] The standard comparison module is used to analyze whether the action time of the protection device meets the industry standard;

[0052] The stability analysis module is used to analyze whether the action time is stable.

[0053] Beneficial effects of the present invention: The present invention verifies whether the protection device operates normally by performing a normal operating condition test on the nacelle, and performs an external fault test on the nacelle based on different environmental conditions to observe whether the protection device correctly shields the external fault signal. The advantage is that the normal operating condition test and the external fault test verify whether the protection device operates normally or misjudgments, ensuring that the protection device is fault-free, and improving the effectiveness of the test of the wind turbine nacelle variable differential protection;

[0054] The present invention performs internal fault tests on the cabin based on different environmental conditions, records the action time of the protection device during each test, analyzes whether the action time of the protection device meets the industry standard, and finally analyzes whether the action time is stable. The advantage is that when setting different environmental conditions, since the output power of the wind turbine is affected by the wind speed, and the wind speed cannot be controlled during the test, the wind speed is directly converted into output power based on the test, and the output power of the wind turbine is simulated by the equipment, so as to achieve the purpose of testing the protection device under all environmental conditions. At the same time, analyzing whether the action time of the protection device meets the industry standard is the basic test. The present invention further tests and analyzes the stability of the action time of the protection device under different environmental conditions. The stability can also reflect whether the working state of the protection device is good, thereby improving the effectiveness, accuracy and comprehensiveness of the test of the wind turbine cabin variable differential protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a functional block diagram of the system of the present invention;

[0056] Figure 2 It is the motion stability analysis diagram of the present invention;

[0057] Figure 3 A flowchart of the steps of the method of the present invention

[0058] Figure 4 A schematic diagram of the structure of an electronic device for the method of the present invention. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] Example 1, please refer to Figure 1 As shown, the present application provides a test system for realizing wind turbine nacelle variable differential protection using optical fiber, including a normal operating condition test module, a fault test module, a standard comparison module and a stability analysis module; the normal operating condition test module, the standard comparison module and the stability analysis module are respectively connected to the fault test module data;

[0061] The normal operating condition test module is used to perform normal operating condition tests on the nacelle to verify whether the protection device is operating normally;

[0062] The normal operating condition test module is configured with a normal operating condition test strategy, which includes:

[0063] Obtaining the rated operating current of the nacelle of the wind turbine generator set, and injecting the rated operating current into the nacelle for a first operating duration;

[0064] Observe whether the protection device is in operation and check whether the protection device sends an alarm signal. If the protection device is in operation and does not send an alarm signal, output a normal operation signal; otherwise, output an abnormal operation signal.

[0065] If an abnormal operation signal is output, the maintenance end is notified to perform maintenance on the protection device;

[0066] In actual applications, the first operating duration is set to continuously observe whether the protection device will make a misjudgment. There is no specific range of values. In this embodiment, the first operating duration is set to 5 minutes. After the rated operating current is injected into the cabin, the protection device runs synchronously. If the protection device sends an alarm signal for the rated operating current, it means that the protection device has made a misjudgment and needs immediate maintenance.

[0067] The fault test module is used to perform internal fault tests and external fault tests on the cabin based on different environmental conditions, and record the action time of the protection device during each test; the fault test module includes an internal fault test unit and an external fault test unit;

[0068] The internal fault test unit is used to perform internal fault tests on the nacelle based on different environmental conditions and record the action time of the protection device during each test;

[0069] The internal fault test unit is configured with an internal fault test strategy, which includes:

[0070] Simulate the phase-to-phase short circuit inside the cabin, inject the differential current, and obtain the time of injecting the differential current, which is named as the signal input time and represented by the symbol T1;

[0071] The time when the protection device outputs a fault signal is obtained, named as the signal output time, represented by the symbol T2, and at the same time, whether the protection device has started the tripping action is observed. If so, a normal operation signal is output; if not, an abnormal operation signal is output; if an abnormal operation signal is output, the maintenance end is notified to perform maintenance on the protection device;

[0072] Calculate T2-T1 to get the action time of the protection device;

[0073] In actual application, T1 is obtained as 10:00:07.091, T2 is 10:00:07.124, it is observed that the protection device starts the tripping action, outputs the normal operation signal, and the action time of the protection device in this test is calculated to be 33ms; the definition of the action time and the acquisition process are explained in detail here, and the action time obtained in subsequent tests under different environmental conditions will not be described in detail;

[0074] Query the minimum and maximum wind speeds of wind turbines in operation in the historical records, which are named minimum wind speed and maximum wind speed respectively;

[0075] Set the first number of operating condition difference groups, represented by the symbol P n Indicates that the values ​​between the lowest wind speed and the highest wind speed are divided into the first number of arithmetic progressions, and the values ​​in the arithmetic progressions are sorted from small to large and numbered F n , where n is a positive integer and 1≤n≤the first quantity, and n is the sequence number of P and F;

[0076] In practical applications, the minimum wind speed and the maximum wind speed reveal the fluctuation range of the environmental conditions of the wind turbine. The minimum wind speed and the maximum wind speed are 2.3m / s and 10.8m / s respectively. The first number is set to 10. The setting of the first number has no practical significance. It is only to divide multiple test groups between the minimum wind speed and the maximum wind speed to analyze the stability of the action time of the protection device. Generally, the larger the first number, the more accurate the result of the stability analysis. The values ​​between the minimum wind speed and the maximum wind speed are divided into the first number of arithmetic progressions to obtain F 1 To F 10 They are 2.3m / s, 3.24m / s, 4.19m / s, 5.13m / s, 6.08m / s, 7.02m / s, 7.97m / s, 8.91m / s, 9.86m / s and 10.8m / s. Since the arithmetic difference is 0.9444, an infinite repeating decimal, we will use F n Keep two decimal places to facilitate subsequent calculation and analysis;

[0077] P n The wind speed is set to F n , converting wind speed into actual power of wind turbines to configure different environmental conditions;

[0078] Get the rotor blade area of ​​the wind turbine, marked as A, get the wind energy utilization coefficient of the wind turbine, marked as Cp, get the air density, marked as ρ, and use the formula U n =0.5×ρ×A×F n 2 ×Cp, calculate P n The actual power, where U nP n The actual power;

[0079] For P n , the output power of the wind turbine is simulated by electronic load and power supply as U n , and inject differential current into the cabin through secondary circuit test, record the action time, each P n A first amount of action time is collected;

[0080] In practical applications, P n The wind speed is set to F n , with P 1 For example, P 1 The wind speed is F 1 =2.3m / s, the area of ​​the wind rotor blade A is 30㎡, the air density is 1.29Kg / m³, the wind energy utilization coefficient Cp is 0.4, and U is calculated. 1 =40.945kW, the result is rounded to three decimal places; for P 1 , the output power of the wind turbine is simulated to be 40.945kW through the existing electronic load and power supply, and then the differential current is injected into the nacelle and its action time is recorded. The injection is repeated and the action time is recorded 10 times. n The same analysis was performed and 100 action times were recorded;

[0081] The external fault test unit is used to perform external fault tests on the nacelle based on different environmental conditions to observe whether the protection device correctly shields the external fault signal;

[0082] The external fault test unit is configured with an external fault test strategy, which includes:

[0083] In each P n The fault current not related to the nacelle is injected in the middle;

[0084] If the protection device does not respond, it outputs a shielding normal signal, otherwise it outputs a shielding abnormal signal;

[0085] If the output shielding abnormal signal is output, the maintenance end is notified to perform maintenance on the protection device;

[0086] In practical applications, irrelevant fault currents include bus fault current, adjacent wind turbine fault current, high-voltage side line fault current, grid-connected system fault current, overload current, transformer excitation surge current, system oscillation current, and transient current or electromagnetic interference. Each fault current is tested in turn. If the protection device has no response, it means that the protection device has successfully shielded the fault current outside the protection range, and the output is a normal shielding signal.

[0087] The standard comparison module is used to analyze whether the action time of the protection device meets the industry standards;

[0088] The standard comparison module is configured with standard comparison strategies, which include:

[0089] Get the industry standard for the action time of the protection device, named standard reaction time;

[0090] Determine whether there is an action time greater than the standard reaction time among all the recorded action times. If so, output a non-compliant reaction signal; otherwise, output a compliant reaction signal.

[0091] If the output response is an unqualified signal, the maintenance end is notified to perform maintenance on the protection device;

[0092] In actual applications, the industry standard for the action time of the protection device is 20ms to 50ms. This embodiment takes the maximum value, that is, the minimum standard as a reference, and obtains a standard reaction time of 50ms. It is determined whether there is an action time greater than 50ms among the 100 action times. If so, a non-compliant reaction signal is output, otherwise a compliant reaction signal is output. If the 100 action times obtained from the test are all less than or equal to 50ms, it means that the action time of the protection device can meet the industry standard under a variety of different environmental conditions, which means that the protection device is fault-free.

[0093] The stability analysis module is used to analyze whether the action time is stable; the stability analysis module includes a stability reference analysis unit and a stability judgment unit;

[0094] The stable reference analysis unit is configured with a stable reference analysis strategy, which includes:

[0095] For any P n , sort the recorded action times in ascending order and number them to obtain T(n,m), where m is a positive integer and 1≤m≤the first number, and (n,m) is the sequence number of T;

[0096] See also Figure 2 As shown, a plane rectangular coordinate system is established with m as the X-axis and the action time as the Y-axis, named the action stability analysis diagram, and T(n,m) is entered into the action stability analysis diagram according to m;

[0097] Perform linear regression analysis on the motion stability analysis graph, and name the function obtained by regression as the motion stability analysis function;

[0098] Obtain the standard deviation of the motion stability analysis function and name it as the motion stability reference value;

[0099] Analyze whether the action time of the protection device is stable based on the action stability reference value;

[0100] In practical applications, with m as the X-axis, the analysis is on the distribution of action time from low to high in different environmental conditions, and the action stability analysis diagram is constructed as follows: Figure 2 As shown, since this embodiment only obtains the standard deviation of the motion stability analysis function, and does not analyze and process the motion stability analysis function itself, the motion stability analysis function is not described in this embodiment. The motion stability reference value obtained by linear regression analysis is 2.60, and the calculation result is rounded to two decimal places;

[0101] The stability judgment unit is configured with a stability judgment strategy, which includes:

[0102] Get the yield rate of the protection device, represented by the symbol H;

[0103] Randomly select a second number of protection devices to test their action stability reference values;

[0104] Sort the action stability reference values ​​from small to large, select the top H action stability reference values, and name them as stable action values;

[0105] Find the maximum value among the stable action values ​​and name it as the action stability threshold;

[0106] The motion stability reference value obtained by actual analysis is compared with the motion stability threshold. If the motion stability reference value is less than or equal to the motion stability threshold, a motion stability signal is output; otherwise, an motion instability signal is output;

[0107] If the output action is unstable, the maintenance end is notified to perform maintenance on the protection device;

[0108] In practical applications, the second number is set to 500. The setting of the second number has no practical significance. It is only for obtaining sufficient samples to analyze the action stability threshold. When obtaining the second number of protection devices, an application is made to the manufacturer of the protection device, and the manufacturer provides sufficient samples for testing, and then finds a reasonable action stability threshold in turn; the yield rate H of the protection device is obtained to be 95%. 500 protection devices provided by the manufacturer are tested for their action stability reference values, and the action stability reference values ​​of the top 95% are selected in order from small to large, that is, the top 475 action stability reference values ​​are obtained and marked as stable action values. The action stability reference value is the standard deviation, and the smaller the standard deviation, the more stable its numerical distribution. The stable action value screens the distribution of the action stability reference values ​​of the good protection devices, and then selects the maximum value to obtain the action stability threshold, which represents the lower limit of the action stability reference value. The action stability reference value below the action stability threshold means that the quality of the corresponding protection device cannot reach the good quality and the stability is reduced. At this time, an action unstable signal is output and maintained to improve the stability of the protection device.

[0109] Example 2, please refer to Figure 3 As shown, the present application provides a test method for implementing wind turbine nacelle variable differential protection using optical fiber, comprising the following steps:

[0110] Step S1, performing a normal operating condition test on the nacelle to verify whether the protection device operates normally; Step S1 includes the following sub-steps:

[0111] Step S101, obtaining the rated operating current of the nacelle of the wind turbine generator set, and injecting the rated operating current into the nacelle for a first operating time;

[0112] Step S102, observe whether the protection device is in operation, and query whether the protection device sends an alarm signal. If the protection device is in operation and does not send an alarm signal, output a normal operation signal, otherwise output an abnormal operation signal;

[0113] Step S103: if an abnormal operation signal is output, the maintenance terminal is notified to perform maintenance on the protection device;

[0114] Step S2, performing internal fault tests and external fault tests on the nacelle based on different environmental conditions, and recording the action time of the protection device during each test; Step S2 includes the following sub-steps:

[0115] Step S201, performing an internal fault test on the nacelle based on different environmental conditions, and recording the action time of the protection device during each test;

[0116] Step S201 includes the following sub-steps:

[0117] Step S201.1, simulating a phase-to-phase short circuit inside the cabin, injecting a differential current, and obtaining a time for injecting the differential current, which is named as a signal input time and represented by a symbol T1;

[0118] Step S201.2, obtaining the time when the protection device outputs a fault signal, named as the signal output time, represented by the symbol T2, and observing whether the protection device has started the tripping action. If so, output a normal operation signal, if not, output an abnormal operation signal; if the abnormal operation signal is output, notify the maintenance end to maintain the protection device;

[0119] Step S201.3, calculate T2-T1 to obtain the action time of the protection device;

[0120] Step S201.4, query the minimum and maximum wind speeds of the wind turbines in the historical records, which are named minimum wind speed and maximum wind speed respectively;

[0121] Step S201.5, set a first number of operating condition difference groups, represented by symbol Pn Indicates that the values ​​between the lowest wind speed and the highest wind speed are divided into the first number of arithmetic progressions, and the values ​​in the arithmetic progressions are sorted from small to large and numbered F n , where n is a positive integer and 1≤n≤the first quantity, and n is the sequence number of P and F;

[0122] Step S201.6, P n The wind speed is set to F n , converting wind speed into actual power of wind turbines to configure different environmental conditions;

[0123] Step S201.6 includes the following sub-steps:

[0124] Step S201.6.a, obtain the rotor blade area of ​​the wind turbine, marked as A, obtain the wind energy utilization coefficient of the wind turbine, marked as Cp, obtain the air density, marked as ρ, and use the formula U n =0.5×ρ×A×F n 2 ×Cp, calculate P n The actual power, where U n P n The actual power;

[0125] Step S201.6.b, for P n , the output power of the wind turbine is simulated by electronic load and power supply as U n , and inject differential current into the cabin through secondary circuit test, record the action time, each P n A first amount of action time is collected;

[0126] Step S202, performing an external fault test on the nacelle based on different environmental conditions to observe whether the protection device correctly shields the external fault signal;

[0127] Step S202 includes the following sub-steps:

[0128] Step S202.1, at each P n The fault current not related to the nacelle is injected in the middle;

[0129] Step S202.2, if the protection device does not respond, a shielding normal signal is output, otherwise a shielding abnormal signal is output;

[0130] Step S202.3, if a shielding abnormality signal is output, the maintenance end is notified to perform maintenance on the protection device;

[0131] Step S3, analyzing whether the action time of the protection device meets the industry standard; Step S3 includes the following sub-steps:

[0132] Step S301, obtaining the industry standard of the action time of the protection device, named as the standard reaction time;

[0133] Step S302, determining whether there is an action time greater than the standard reaction time among all the recorded action times, if so, outputting a reaction non-compliance signal, otherwise outputting a reaction compliance signal;

[0134] Step S303: if the output response signal is unqualified, notify the maintenance end to perform maintenance on the protection device;

[0135] Step S4, analyzing whether the action time is stable; Step S4 includes the following sub-steps:

[0136] Step S401: for any P n , sort the recorded action times in ascending order and number them to obtain T(n,m), where m is a positive integer and 1≤m≤the first number, and (n,m) is the sequence number of T;

[0137] Step S402, establish a plane rectangular coordinate system with m as the X-axis and the action time as the Y-axis, name it as the action stability analysis diagram, and enter T(n,m) into the action stability analysis diagram according to m;

[0138] Step S403, performing linear regression analysis on the motion stability analysis graph, and naming the function obtained by regression as the motion stability analysis function;

[0139] Step S404, obtaining the standard deviation of the motion stability analysis function, and naming it as the motion stability reference value;

[0140] Step S405, analyzing whether the action time of the protection device is stable based on the action stability reference value;

[0141] Step S405 includes the following sub-steps:

[0142] Step S405.1, obtaining the yield rate of the protection device, represented by the symbol H;

[0143] Step S405.2, randomly selecting a second number of protection devices to test their action stability reference values;

[0144] Step S405.3, sorting the action stability reference values ​​from small to large, selecting the top H action stability reference values, and naming them stable action values;

[0145] Step S405.4, finding the maximum value among the stable action values, and naming it as the action stability threshold;

[0146] Step S405.5, comparing the motion stability reference value obtained by actual analysis with the motion stability threshold value, if the motion stability reference value is less than or equal to the motion stability threshold value, outputting a motion stability signal, otherwise outputting an motion instability signal;

[0147] Step S405.6: If the output action is unstable, notify the maintenance end to perform maintenance on the protection device.

[0148] Example 3, please refer to Figure 4 As shown, Figure 4 An example of a structural schematic diagram of an electronic device is provided, and the electronic device may include: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus. The memory stores computer-readable instructions, and the processor may call the instructions in the memory. When the computer-readable instructions are executed by the processor, the steps in the test method for implementing wind turbine nacelle variable differential protection using optical fiber are executed to achieve the following functions: perform normal operating condition test on the nacelle to verify whether the protection device operates normally; perform internal fault test and external fault test on the nacelle based on different environmental conditions, and record the action time of the protection device during each test; analyze whether the action time of the protection device meets the industry standard; and analyze whether the action time is stable.

[0149] In addition, the logic instructions in the above-mentioned memory can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0150] Embodiment 4, the present application also provides a computer-readable storage medium, the present application provides a storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the test method for realizing variable differential protection of a wind turbine nacelle using optical fiber are executed as above to realize the following functions: perform a normal operating condition test on the nacelle to verify whether the protection device operates normally; perform an internal fault test and an external fault test on the nacelle based on different environmental conditions, and record the action time of the protection device during each test; analyze whether the action time of the protection device meets industry standards; and analyze whether the action time is stable.

[0151] Through the description of the above implementation methods, the embodiments of the present invention can be provided as methods, systems or computer program products. Based on such an understanding, the above technical solutions can be essentially or partly contributed to the prior art in the form of software products, which can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and include several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0152] In the embodiments provided in the present application, it should be understood that the disclosed system or method can be implemented in other ways. The embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, multiple modules or units can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of systems, modules and units can be electrical, mechanical or other forms.

[0153] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A test method for realizing wind turbine nacelle transformer differential protection using optical fiber, characterized in that: The steps include: Conduct normal operating condition tests on the engine room to verify whether the protection devices are operating normally; Conduct internal fault tests and external fault tests on the nacelle based on different environmental conditions, and record the action time of the protection device during each test; Analyze whether the action time of the protection device meets the industry standards; Analyze whether the action time is stable; Performing internal fault tests on the nacelle based on different environmental conditions and recording the action time of the protection device during each test includes the following sub-steps: Simulate the phase-to-phase short circuit inside the cabin, inject the differential current, and obtain the time of injecting the differential current, which is named as the signal input time and represented by the symbol T1; The time when the protection device outputs a fault signal is obtained, named as the signal output time, represented by the symbol T2, and at the same time, whether the protection device has started the tripping action is observed. If so, a normal operation signal is output; if not, an abnormal operation signal is output; if an abnormal operation signal is output, the maintenance end is notified to perform maintenance on the protection device; Calculate T2-T1 to get the action time of the protection device; Query the minimum and maximum wind speeds of wind turbines in operation in the historical records, which are named minimum wind speed and maximum wind speed respectively; Set the first number of operating condition difference groups, represented by symbol P n Indicates that the values ​​between the lowest wind speed and the highest wind speed are divided into the first number of arithmetic progressions, and the values ​​in the arithmetic progressions are sorted from small to large and numbered F n , where n is a positive integer and 1≤n≤first number, and n is the sequence number of P and F; P n The wind speed is set to F n , converting wind speed into actual power of wind turbines to configure different environmental conditions; Analyzing whether the action time is stable includes the following sub-steps: For any P n , sort the recorded action times in ascending order and number them to obtain T(n,m), where m is a positive integer and 1≤m≤the first number, and (n,m) is the sequence number of T; A plane rectangular coordinate system is established with m as the X-axis and the action time as the Y-axis, named the action stability analysis diagram, and T(n,m) is entered into the action stability analysis diagram according to m; Perform linear regression analysis on the motion stability analysis graph, and name the function obtained by regression as the motion stability analysis function; Obtain the standard deviation of the motion stability analysis function and name it as the motion stability reference value; Analyze whether the action time of the protection device is stable based on the action stability reference value.

2. The method for testing wind turbine nacelle differential protection using optical fiber according to claim 1, characterized in that: Performing normal operating test on the nacelle to verify whether the protection device is operating normally includes the following sub-steps: Obtaining the rated operating current of the nacelle of the wind turbine generator set, and injecting the rated operating current into the nacelle for a first operating duration; Observe whether the protection device is in operation and check whether the protection device sends an alarm signal. If the protection device is in operation and does not send an alarm signal, output a normal operation signal; otherwise, output an abnormal operation signal. If an abnormal operation signal is output, the maintenance end is notified to perform maintenance on the protection device.

3. The test method for realizing wind turbine nacelle differential protection using optical fiber according to claim 2 is characterized in that: Performing internal fault tests and external fault tests on the nacelle based on different environmental conditions and recording the action time of the protection device during each test includes the following sub-steps: Conduct internal fault tests on the nacelle based on different environmental conditions and record the action time of the protection device during each test; Perform external fault tests on the nacelle based on different environmental conditions to observe whether the protection device correctly shields the external fault signal.

4. The method for testing wind turbine nacelle differential protection using optical fiber according to claim 3 is characterized in that: Converting wind speed into actual power of wind turbines to configure different environmental conditions includes the following sub-steps: Get the rotor blade area of ​​the wind turbine, marked as A, get the wind energy utilization coefficient of the wind turbine, marked as Cp, get the air density, marked as ρ, and use the formula U n =0.5×ρ×A×F n 2 ×Cp, calculate P n The actual power, where U n P n The actual power; For P n , the output power of the wind turbine is simulated by electronic load and power supply as U n , and inject differential current into the cabin through secondary circuit test, record the action time, each P n A first amount of action time is collected.

5. The method for testing wind turbine nacelle differential protection using optical fiber according to claim 4, characterized in that: Performing external fault tests on the nacelle based on different environmental conditions to observe whether the protection device correctly shields the external fault signal includes the following sub-steps: In each P n The fault current not related to the nacelle is injected in the middle; If the protection device does not respond, it outputs a shielding normal signal, otherwise it outputs a shielding abnormal signal; If the output shielding abnormal signal is output, the maintenance end is notified to perform maintenance on the protection device.

6. The method for testing wind turbine nacelle differential protection using optical fiber according to claim 5, characterized in that: Analyzing whether the action time of the protection device meets the industry standard includes the following sub-steps: Get the industry standard for the action time of the protection device, named standard reaction time; Determine whether there is an action time greater than the standard reaction time among all the recorded action times. If so, output a non-compliant reaction signal; otherwise, output a compliant reaction signal. If the output responds to an unqualified signal, the maintenance end is notified to perform maintenance on the protection device.

7. The method for testing wind turbine nacelle differential protection using optical fiber according to claim 6, characterized in that: Analyzing whether the action time of the protection device is stable based on the action stability reference value includes the following sub-steps: Get the yield rate of the protection device, represented by the symbol H; Randomly select a second number of protection devices to test their action stability reference values; Sort the action stability reference values ​​from small to large, select the top H action stability reference values, and name them as stable action values; Find the maximum value among the stable action values ​​and name it as the action stability threshold; The motion stability reference value obtained by actual analysis is compared with the motion stability threshold. If the motion stability reference value is less than or equal to the motion stability threshold, a motion stability signal is output; otherwise, an motion instability signal is output; If the output action is unstable, the maintenance end will be notified to perform maintenance on the protection device.

8. A test system for implementing wind turbine nacelle differential protection using optical fiber, used to implement the test method for implementing wind turbine nacelle differential protection using optical fiber as claimed in any one of claims 1 to 7, characterized in that: It includes a normal operating condition test module, a fault test module, a standard comparison module and a stability analysis module; the normal operating condition test module, the standard comparison module and the stability analysis module are respectively connected with the fault test module data; The normal operating condition test module is used to perform a normal operating condition test on the cabin to verify whether the protection device operates normally; The fault test module is used to perform internal fault tests and external fault tests on the nacelle based on different environmental conditions, and record the action time of the protection device during each test; The standard comparison module is used to analyze whether the action time of the protection device meets the industry standard; The stability analysis module is used to analyze whether the action time is stable.

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