Converter transformer testing method, device, equipment and readable storage medium

Abstract

The present application provides a converter transformer testing method, device, equipment and readable storage medium. When it is necessary to test whether the converter transformer protection provided by the target converter transformer in the new energy station is suitable for the new energy station, the test points for sampling the converter transformer protection and the AC current and voltage affected by the new energy station can be determined; and the test is performed, and the results are collected for comparison, and it is determined whether the comparison result exceeds the threshold; if so, it is determined that the converter transformer protection is not easily affected by the wind farm station, and the target converter transformer meets the adaptability requirements of the wind farm station. The adaptability of the converter transformer protection provided by the converter transformer can be tested according to the type of new energy station, so that the converter transformer can provide better converter transformer protection, which is not only conducive to maintaining the safety and stability of the power grid environment dominated by the new energy station at the sending end, but also conducive to protecting the converter transformer and improving the equipment life of the converter transformer.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment testing, and in particular to a converter transformer testing method, device, equipment and readable storage medium. Background Art

[0002] With the development of science and technology, the development of new energy technology is getting better and better. In the actual application process, new energy stations can generally include wind power stations, photovoltaic stations, etc. The current and voltage characteristics of the output of new energy stations are compared with the normal AC voltage and current. The current close to the grid side in the converter transformer protection in the new energy station has the characteristics of limiting current and controlling phase, which can easily cause the converter transformer differential protection in the DC transmission system to malfunction or refuse to operate. In order to solve this problem, converter transformers are generally used to provide converter transformer protection for the DC transmission system of new energy stations.

[0003] However, since the photovoltaic power station is a weak system, if the DC input power source is mainly photovoltaic, the closing of the converter transformer may cause the excitation surge current to lock the differential protection for a long time. In addition, when the photovoltaic power station fails in a short circuit, its power has secondary characteristics, which can easily cause the differential protection to lock, resulting in the converter transformer protection to refuse to operate.

[0004] Therefore, in order to better provide converter transformer protection for the DC transmission system, it is necessary to test the adaptability of the converter transformer protection provided by the converter transformer in the power grid environment where the sending end is mainly composed of new energy stations. Summary of the invention

[0005] The present application aims to solve at least one of the above-mentioned technical defects. In view of this, the present application provides a converter transformer testing method, device, equipment and readable storage medium to solve the technical defect in the prior art that it is impossible to comprehensively test the adaptability of the converter transformer in the power grid environment with different new energy stations.

[0006] A converter transformer testing method, comprising:

[0007] Determine the test points for sampling the converter transformer protection of the target converter transformer;

[0008] Determine the amount of AC current and voltage affected by the new energy site;

[0009] Using a preset first simulation environment to test the target converter transformer, and collecting a first differential protection action time and a first action result of the target converter transformer;

[0010] Comparing the first differential protection action time and the first action result with a preset protection action time and a preset braking value respectively to obtain a first target comparison result;

[0011] Determining whether the first target comparison result exceeds a preset first threshold;

[0012] If the first target comparison result does not exceed the preset first threshold, it is determined that the converter transformer protection of the target converter transformer is not easily affected by the wind farm, and the target converter transformer meets the adaptability requirements of the wind farm.

[0013] Preferably, if the first target comparison result exceeds the preset first threshold, the method further comprises:

[0014] Using a preset second simulation environment to test the target converter transformer, and determining whether the target converter transformer has a refusal to operate phenomenon;

[0015] If it is found that the target converter transformer has a refusal to operate in the preset second simulated commutation, it is determined that the converter transformer protection of the target converter transformer is affected by the wind farm and may cause the protection to fail to operate, and the target converter transformer fails the detection;

[0016] If it is found that the target converter transformer has no refusal to operate in the preset second simulated commutation, it is determined that the converter transformer protection of the target converter transformer is not easily affected by the wind farm station, and the target converter transformer meets the adaptability requirements of the wind farm station.

[0017] Preferably, the method further comprises:

[0018] Determining whether the sampling circuit adopted by the target converter transformer passes through a software filter or a hardware filter;

[0019] If the sampling circuit used by the target converter transformer does not pass through a software filter or a hardware filter, determining a converter transformer protection type of the target converter transformer affected by the second harmonic;

[0020] According to the type of converter transformer protection of the target converter transformer affected by the second harmonic, analyzing the reasons why the second harmonic affects the converter transformer protection of the target converter transformer;

[0021] Using a preset third simulation environment to test the target converter transformer;

[0022] Determine whether the converter transformer protection of the target converter transformer has malfunction under the preset third simulation environment;

[0023] If the converter transformer protection of the target converter transformer malfunctions under the preset third simulation environment, it is determined that the converter transformer protection of the target converter transformer is affected by the new energy station, which is prone to malfunction of the protection, and the target converter transformer fails the detection.

[0024] Preferably, the method further comprises:

[0025] If the converter transformer protection of the target converter transformer has no malfunction under the preset third simulation environment, determining whether the converter transformer protection of the target converter transformer has an exit problem at any power curve of the photovoltaic station;

[0026] If the converter transformer protection of the target converter transformer has a problem of exiting at any power curve of the photovoltaic station, it is determined that the converter transformer protection of the target converter transformer is affected by the new energy station, which is likely to cause protection exit, and the target converter transformer fails the detection.

[0027] Preferably, the method further comprises:

[0028] If the converter transformer protection of the target converter transformer does not have the problem of exiting under any power curve of the photovoltaic station, it is determined that the converter transformer protection of the target converter transformer is not easily affected by the photovoltaic station, and the target converter transformer meets the adaptability requirements of the photovoltaic station.

[0029] Preferably, the method further comprises:

[0030] If the sampling circuit used by the target converter transformer passes through a software filter or a hardware filter, determining whether the software filter or the hardware filter filters the second harmonic;

[0031] If the software filter or the hardware filter filters the second harmonic, the target converter transformer is tested using a preset fourth simulation environment;

[0032] Determine whether the switch overcurrent protection and the differential protection of the target converter transformer have an increased delay under the preset fourth simulation environment;

[0033] If, under the preset fourth simulation environment, the switch overcurrent protection and the differential protection of the target converter transformer do not increase the delay, it is determined that the detection of the target converter transformer is qualified.

[0034] Preferably, the method further comprises:

[0035] If, under the preset fourth simulation environment, the switch overcurrent protection and the differential protection of the target converter transformer have an increased delay, determining whether the increased delay exceeds the equipment tolerance of the target converter transformer;

[0036] If the increased delay does not exceed the equipment tolerance of the target converter transformer, it is determined that the target converter transformer has passed the inspection;

[0037] If the increased delay exceeds the equipment tolerance of the target converter transformer, it is determined that the commutation protection software filtering or hardware filtering of the target converter transformer will cause the differential protection or overcurrent protection of the target converter transformer to fail to operate, and the target converter transformer fails the detection.

[0038] A converter transformer testing device, comprising:

[0039] A first determination unit is used to determine a test point for sampling a converter transformer protection of a target converter transformer;

[0040] A second determination unit is used to determine the amount of alternating current and voltage affected by the new energy station;

[0041] A first testing unit, configured to test the target converter transformer by using a preset first simulation environment, and collect a first differential protection action time and a first action result of the target converter transformer;

[0042] A comparing unit, used for comparing the first differential protection action time and the first action result with a preset protection action time and a preset braking value respectively, to obtain a first target comparison result;

[0043] A first judging unit, configured to judge whether the first target comparison result exceeds a preset first threshold;

[0044] The first analysis unit is used to determine that the converter transformer protection of the target converter transformer is not easily affected by the wind farm when the execution result of the first judgment unit is that the first target comparison result does not exceed the preset first threshold value, and the target converter transformer meets the adaptability requirements of the wind farm.

[0045] A converter transformer testing device comprises: one or more processors, and a memory;

[0046] The memory stores computer-readable instructions, and when the computer-readable instructions are executed by the one or more processors, the steps of the converter transformer testing method as described in any one of the above introductions are implemented.

[0047] A readable storage medium stores computer-readable instructions. When the computer-readable instructions are executed by one or more processors, the one or more processors implement the steps of the converter transformer testing method as described in any one of the above introductions.

[0048] It can be seen from the technical solutions introduced above that when it is necessary to test whether the converter transformer protection provided by the target converter transformer in the new energy station is suitable for the new energy station, the method provided in the embodiment of the present application can determine the test point for sampling the converter transformer protection of the target converter transformer; at the same time, the AC current and voltage affected by the new energy station can be determined; after determining the test point for sampling the protection of the target converter transformer and the AC current and voltage affected by the new energy station, the target converter transformer can be tested using a preset first simulation environment, and the first differential protection action time and the first action result of the target converter transformer can be collected; after collecting the first differential protection action time and the first action result of the target converter transformer, the first differential protection action time and the first action result can be compared with the preset protection action time and the preset braking value respectively, and after obtaining the first target comparison result; it can be determined whether the first target comparison result exceeds the preset first threshold; if the first target comparison result does not exceed the preset first threshold, it can be determined that the converter transformer protection of the target converter transformer is not easily affected by the wind farm station, and the target converter transformer meets the adaptability requirements of the wind farm station.

[0049] The method provided in the embodiment of the present application can test the adaptability of the converter transformer protection provided by the converter transformer in a power grid environment dominated by new energy stations at the sending end according to the type of new energy stations, so that the converter transformer can provide better converter transformer protection for the power grid environment dominated by new energy stations at the sending end, which is beneficial to maintaining the security and stability of the power grid environment dominated by new energy stations at the sending end, and is also beneficial to protecting the converter transformer and increasing the equipment life of the converter transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0051] Figure 1 A flowchart of a converter transformer testing method provided in an embodiment of the present application;

[0052] Figure 2 A typical connection diagram between a new energy station and a converter transformer provided in an embodiment of the present application;

[0053] Figure 3 A schematic diagram of the structure of a converter transformer testing device exemplified in an embodiment of the present application;

[0054] Figure 4 This is a hardware structure block diagram of a converter transformer testing device disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] Converter transformer refers to the power transformer connected between the converter bridge and the AC system. The converter transformer can realize the connection between the converter bridge and the AC bus, and provide a three-phase commutation voltage with an ungrounded neutral point for the converter bridge. The converter transformer and the converter bridge are the main components of the converter unit. In actual application, the role of the converter transformer in the DC transmission system can include the following:

[0057] 1. Transmit electricity;

[0058] 2. Convert the AC system voltage to the commutation voltage required by the converter;

[0059] 3. Using different connection methods of transformer windings, two sets of three-phase symmetrical commutation voltages with equal amplitude and 30° phase difference (fundamental wave electrical angle) are provided to the two series-connected converters to realize twelve-pulse commutation;

[0060] 4. Insulate the DC part from the AC system to avoid direct short circuit between the neutral point of the AC system and the neutral point of the DC part, which would make commutation impossible.

[0061] 5. The leakage reactance of the converter transformer can limit the fault current;

[0062] 6. It can buffer and suppress the lightning impulse overvoltage wave that invades the converter station along the AC line.

[0063] Converter transformers can provide converter transformer protection for DC transmission systems. In order to better provide converter transformer protection for DC transmission systems, it is necessary to ensure that converter transformers used in DC transmission systems can adapt to different types of renewable energy stations. To this end, it is necessary to test the adaptability of converter transformer protection provided by converter transformers in a power grid environment dominated by renewable energy stations at the sending end.

[0064] In view of the fact that most of the current converter transformer testing schemes are difficult to adapt to complex and changeable business needs, the applicant has studied a converter transformer testing scheme. The converter transformer testing method can test the adaptability of the converter transformer protection provided by the converter transformer in the power grid environment dominated by new energy stations at the sending end according to the type of new energy stations, so that the converter transformer can provide better converter transformer protection for the power grid environment dominated by new energy stations at the sending end, which is beneficial to maintaining the safety and stability of the power grid environment dominated by new energy stations at the sending end, and is also beneficial to protecting the converter transformer and increasing the equipment life of the converter transformer.

[0065] The method provided in the embodiments of the present application can be used in many general or special computing device environments or configurations, such as personal computers, server computers, handheld devices or portable devices, tablet devices, multi-processor devices, and distributed computing environments including any of the above devices or equipment.

[0066] An embodiment of the present application provides a converter transformer testing method, which can be applied to various DC transmission systems and can also be applied to various computer terminals or smart terminals. The execution subject can be a processor or server of the computer terminal or smart terminal.

[0067] Combine the following Figure 1 and Figure 2 , introduces the process of the converter transformer testing method given in the embodiment of the present application, such as Figure 1 As shown, the process can include the following steps:

[0068] Step S101, determining a test point for sampling a converter transformer protection of a target converter transformer.

[0069] Specifically, in actual application, in order to test the performance of the converter transformer, some converter transformer protection sampling test points are generally set on the converter transformer to be tested, so that the required test data can be collected at the set sampling points, and the test data can be used to analyze the adaptability or performance of the converter transformer to be tested.

[0070] For example, Figure 2 An example of a typical connection diagram between a new energy station and a converter transformer is provided.

[0071] in,

[0072] S1 can represent AC circuit breaker 1

[0073] IACY can represent the AC current on the grid side of the Y-type converter transformer;

[0074] IACD can represent the AC current on the grid side of the D-type converter transformer;

[0075] UVY can represent the AC voltage on the valve side of the Y-type converter transformer;

[0076] UVD can represent the AC voltage on the valve side of the D-type converter transformer;

[0077] IVY can represent the AC current on the valve side of the Y-type converter transformer;

[0078] IVD can represent the AC current on the valve side of the D-type converter transformer.

[0079] Step S102, determining the AC current and voltage affected by the new energy station.

[0080] Specifically, in actual application, some DC transmission systems are mainly based on renewable energy stations at the sending end. Compared with the current and voltage characteristics of other types of stations, the current and voltage characteristics of renewable energy stations output in the power grid environment with renewable energy stations as the sending end have the characteristics of limiting current and controlling phase in the current near the grid side of the converter transformer protection. This characteristic can limit the current amplitude and change the current phase, which can easily cause the converter transformer differential protection in the DC transmission system to malfunction or refuse to operate, thereby affecting the AC current and voltage output by the converter transformer.

[0081] For example, when the type of new energy station is a photovoltaic station, since photovoltaics is a weak system, if the DC input power source is mainly photovoltaics, the closing of the converter transformer may cause the excitation surge current to lock the differential protection time for a long time. In addition, when a short circuit fault occurs in the photovoltaic station, the power output of the photovoltaic station has secondary characteristics and is prone to generate secondary harmonics. Under the influence of secondary harmonics, the converter transformer is prone to cause the differential protection to lock, resulting in the converter transformer protection of the DC transmission system to refuse to operate.

[0082] In order to better test the performance of the target converter transformer and its applicability in the new energy station, the AC current and voltage affected by the new energy station can be determined so that the converter transformer protection affected by the target converter transformer can be analyzed, as well as the performance of the target converter transformer and its adaptability in the new energy station.

[0083] Among them, the converter transformer differential protection can reflect the difference between the bushing current on the AC side of the converter transformer and the bushing current on the valve side, and is used to cut off the protection of various zone faults of the converter transformer.

[0084] Step S103: testing the target converter transformer by using a preset first simulation environment, and collecting a first differential protection action time and a first action result of the target converter transformer.

[0085] Specifically, from the above introduction, it can be seen that the method provided in the embodiment of the present application can determine the AC current and voltage of the target converter transformer affected by the new energy station. Based on the AC current and voltage of the target converter transformer affected by the new energy station, the method provided in the embodiment of the present application can test the target converter transformer in combination with a preset first simulation environment.

[0086] The preset first simulation environment may be as follows:

[0087] A wind farm station is built on the grid side of the converter transformer, and a real-time digital simulation system (RTDS) is used to simulate the fault environment. RTDS is the product of the development of digital simulation technology, computer technology and parallel processing technology. It not only has the characteristics of digital simulation, but more importantly, it uses parallel processing technology and designs special hardware, which can ensure the real-time operation of RTDS and the ability of closed-loop testing, and can complete the real-time simulation operation of large-scale power systems at a step size of 50μS.

[0088] According to the AC current and voltage of the target converter transformer affected by the new energy station, the target converter transformer is tested under a preset first simulation environment, and the first differential protection action time and the first action result of the target converter transformer can be collected.

[0089] Step S104: compare the first differential protection action time and the first action result with a preset protection action time and a preset braking value respectively to obtain a first target comparison result.

[0090] Specifically, from the above introduction, it can be seen that the method provided in the embodiment of the present application can collect the first differential protection action time and the first action result of the target converter transformer in the predicted first simulation environment. The first differential protection action time and the first action result of the target converter transformer in the predicted first simulation environment reflect the performance of the target converter transformer and the adaptability of the target converter transformer in the new energy station.

[0091] Therefore, after obtaining the first differential protection action time and the first action result, the first differential protection action time and the first action result can be compared with the preset protection action time and the preset braking value respectively to obtain the first target comparison result.

[0092] For example, the target converter transformer can be tested after setting one network test end of the converter transformer to an infinite power supply to obtain a second test result; the collected first differential protection action time and the first action result are compared with the second test results, thereby obtaining the first target comparison result.

[0093] Step S105, determining whether the first target comparison result exceeds a preset first threshold.

[0094] Specifically, from the above introduction, it can be seen that the method provided in the embodiment of the present application can determine the first differential protection action time and the first action result and the first target comparison result. After obtaining the first target comparison result, it can be determined whether the first target comparison result exceeds the preset first threshold. If the first target comparison result does not exceed the preset first threshold, it means that the converter transformer protection of the target converter transformer is not easily affected by the new energy station, and step S106 can be executed. If the first target comparison result exceeds the preset first threshold, it means that the converter transformer protection of the target converter transformer may be affected by the new energy station.

[0095] The value range of the preset first threshold can be set to [0, 10%].

[0096] Experiments have shown that when the first target comparison result is less than or equal to 10%, it means that the target converter transformer is tested under a preset first simulation environment, and the first differential protection action time and the first action result of the target converter transformer collected are not much different from the preset protection action time and the preset braking value.

[0097] Step S106: determine that the converter transformer protection of the target converter transformer is not easily affected by the wind farm, and the target converter transformer meets the adaptability requirements of the wind farm.

[0098] Specifically, from the above introduction, it can be seen that the method provided in the embodiment of the present application can determine whether the target converter transformer is tested under a preset first simulation environment, and whether the first differential protection action time and the first action result of the target converter transformer collected have an error with the preset protection action time and the preset braking value that exceeds 10%. When the first target comparison result is less than or equal to 10%, it means that the target converter transformer is tested under a preset first simulation environment, and the first differential protection action time and the first action result of the target converter transformer collected have an error with the preset protection action time and the preset braking value that is not large. It can be determined that the converter transformer protection of the target converter transformer is not easily affected by the wind farm station, and the target converter transformer meets the adaptability requirements of the wind farm station.

[0099] From the technical solutions introduced above, it can be seen that the method provided in the embodiment of the present application can test the adaptability of the converter transformer protection provided by the converter transformer in the power grid environment dominated by new energy stations at the sending end according to the type of new energy stations, so that the converter transformer can provide better converter transformer protection for the power grid environment dominated by new energy stations at the sending end, which is beneficial to maintaining the safety and stability of the power grid environment dominated by new energy stations at the sending end, and is also beneficial to protecting the converter transformer and improving the equipment life of the converter transformer.

[0100] In actual application, when the sending end of the DC transmission system is mainly a wind farm station, if the first target comparison result exceeds the preset first threshold, the implementation method of the converter transformer test method provided in the embodiment of the present application is different. Next, the process is introduced, which may include the following steps:

[0101] Step S201: test the target converter transformer using a preset second simulation environment, and determine whether the target converter transformer has a refusal to operate phenomenon.

[0102] Specifically, from the above introduction, it can be seen that when the sending end of the DC transmission system is mainly a wind farm station, the method provided in the embodiment of the present application can determine whether the first target comparison result exceeds the preset first threshold value, so as to check the adaptability of the target converter transformer in the new energy station.

[0103] When the first target comparison result exceeds the preset first threshold, the target converter transformer can be tested in a further preset second simulation environment to determine whether the target converter transformer has a refusal to operate phenomenon.

[0104] For example, the second simulation environment can be set as follows:

[0105] A model in which the grid side of the target converter transformer is a wind farm can be adopted, and RTDS can be used to simulate the fault environment, and single-phase grounding can be simulated on the grid side of the target converter transformer, and three-phase grounding can be simulated on the valve side of the target converter transformer, wherein the transition resistance of the target converter transformer is set to 0.1Ω, 1Ω, 10Ω, and 100Ω, respectively. The target converter transformer is tested under different transition resistances, and it is determined whether the target converter transformer has a refusal to operate phenomenon.

[0106] If it is found that the target converter transformer refuses to operate in the preset second simulated commutation, it means that the converter transformer protection of the target converter transformer may be affected by the wind farm and may cause the protection to fail to operate, and step S202 can be executed; if it is found that the target converter transformer does not refuse to operate in the preset second simulated commutation, it means that the converter transformer protection of the target converter transformer is not easily affected by the wind farm, and thus step S203 can be executed.

[0107] Step S202, determining that the converter transformer protection of the target converter transformer is affected by the wind farm and may cause protection failure, and the target converter transformer detection fails.

[0108] Specifically, it can be seen from the above introduction that the method provided in the embodiment of the present application can use a preset second simulation environment to test the target converter transformer and determine whether the target converter transformer has a refusal to operate phenomenon.

[0109] If it is found that the target converter transformer has a refusal to operate in the preset second simulated commutation, it means that the converter transformer protection of the target converter transformer may be affected by the wind farm and may cause the protection to refuse to operate. If the converter transformer protection of the target converter transformer causes the protection to refuse to operate, it means that the target converter transformer may not be able to adapt to the influence of the wind farm. It can be determined that the converter transformer protection of the target converter transformer may be affected by the wind farm and may cause the protection to refuse to operate, and the target converter transformer fails the detection.

[0110] Step S203: determine that the converter transformer protection of the target converter transformer is not easily affected by the wind farm, and the target converter transformer meets the adaptability requirements of the wind farm.

[0111] Specifically, it can be seen from the above introduction that the method provided in the embodiment of the present application can use a preset second simulation environment to test the target converter transformer and determine whether the target converter transformer has a refusal to operate phenomenon.

[0112] If it is found that the target converter transformer does not refuse to operate in the preset second simulated commutation, it means that the converter transformer protection of the target converter transformer may not be affected by the wind farm, indicating that the target converter transformer can adapt to the influence of the wind farm. It can be determined that the converter transformer protection of the target converter transformer is not easily affected by the wind farm station, and the target converter transformer meets the adaptability requirements of the wind farm station.

[0113] From the technical solutions introduced above, it can be seen that the method provided in the embodiment of the present application can test the adaptability of the converter transformer protection provided by the converter transformer in the power grid environment dominated by new energy stations at the sending end according to the type of new energy stations, so that the converter transformer can provide better converter transformer protection for the power grid environment dominated by new energy stations at the sending end, which is beneficial to maintaining the safety and stability of the power grid environment dominated by new energy stations at the sending end, and is also beneficial to protecting the converter transformer and improving the equipment life of the converter transformer.

[0114] From the above introduction, it can be known that the method provided in the embodiment of the present application can determine whether the sampling circuit of the target converter transformer passes through the software filter or the hardware filter. If the sampling circuit of the target converter transformer passes through the software filter or the hardware filter, the target converter transformer will not be affected by the secondary harmonics generated by the new energy station. In actual application, if the sampling circuit used by the target converter transformer passes through the software filter or the hardware filter, the method provided in the embodiment of the present application will be different for the test method of the target converter transformer. Next, the process is introduced, which may include the following steps:

[0115] Step S301, determining whether the sampling circuit used by the target converter transformer passes through a software filter or a hardware filter.

[0116] Specifically, in actual application, if the sampling circuit used by the target converter transformer passes through a software filter or a hardware filter, the method provided in the embodiment of the present application will have a different test method for the target converter transformer.

[0117] Therefore, after determining the test points for sampling the converter transformer protection of the target converter transformer and the AC current and voltage affected by the new energy station, it can be determined whether the sampling circuit used by the target converter transformer passes through a software filter or a hardware filter.

[0118] If the sampling circuit used by the target converter transformer does not pass through the software filter or the hardware filter, it means that the target converter transformer may be affected by the secondary harmonics generated by the new energy station. Therefore, it is necessary to analyze the reasons for the influence of the secondary harmonics generated by the new energy station according to the type of converter transformer protection. Therefore, step S302 can be executed to determine the converter transformer protection type of the target converter transformer to analyze the reasons for the influence of the secondary harmonics generated by the new energy station on the target converter transformer.

[0119] Step S302, determining the converter transformer protection type of the target converter transformer affected by the second harmonic.

[0120] Specifically, in actual application, there are many types of converter transformer protection that the converter transformer can provide, such as converter transformer large differential protection, small differential protection, overcurrent protection, overvoltage protection, lead differential protection, winding differential protection, etc.

[0121] It can be seen from the above introduction that the method provided in the embodiment of the present application can determine whether the sampling circuit adopted by the target converter transformer passes through a software filter or a hardware filter.

[0122] If it is determined that the sampling circuit used by the target converter transformer does not pass through the software filter or the hardware filter, it is necessary to determine the converter transformer protection type affected by the second harmonic of the target converter transformer, so as to analyze the reason why the target converter transformer is affected by the second harmonic generated by the new energy station.

[0123] Step S303: analyzing the reasons why the second harmonic affects the commutation transformer protection of the target converter transformer according to the commutation transformer protection type of the target converter transformer affected by the second harmonic.

[0124] Specifically, it can be seen from the above introduction that the method provided in the embodiment of the present application can determine the converter transformer protection type of the target converter transformer under the influence of the second harmonic. The affected converter transformer protection type is different, and the cause of the influence will also be different.

[0125] Therefore, after determining the converter transformer protection type of the target converter transformer affected by the second harmonic, the reason why the second harmonic affects the converter transformer protection of the target converter transformer can be analyzed according to the converter transformer protection type of the target converter transformer affected by the second harmonic.

[0126] For example, the reason why the target converter transformer is affected by the second harmonic on the converter transformer protection of the target converter transformer may be: causing the commutation transformer to be large differential protection locked, or the differential protection to malfunction, etc.

[0127] For example, since the converter transformer generates excitation surge current when the switch is closed and the circuit breaker is empty, it may cause the differential protection to malfunction. Therefore, the general differential protection will detect the second harmonic content reaching the specified value and lock the protection. The significant feature of the excitation surge current is that the second harmonic of the AC current increases. In addition, due to the limiting current and control current phase of the photovoltaic station, the current difference between the grid side and the valve side may be large during the transient process, causing the protection to malfunction.

[0128] Step S304: test the target converter transformer using a preset third simulation environment, and determine whether the converter transformer protection of the target converter transformer has malfunction under the preset third simulation environment.

[0129] Specifically, from the above introduction, it can be seen that the method provided in the embodiment of the present application can analyze the reasons why the converter transformer protection of the target converter transformer is affected by the second harmonic according to the type of converter transformer protection of the target converter transformer affected by the second harmonic. After determining the reasons why the converter transformer protection of the target converter transformer is affected by the second harmonic, the target converter transformer can be further tested using a preset third simulation environment, and it can be determined whether the converter transformer protection of the target converter transformer has malfunction under the preset third simulation environment, so as to analyze the adaptability of the target converter transformer under the influence of the second harmonic of the new energy station.

[0130] The preset third simulation environment can be set to one or more of the following environments:

[0131] (1) The converter switch of the target converter transformer may be set to be closed under the worst working condition;

[0132] For example, the operating condition with the largest excitation inrush current can be simulated to simulate whether the differential protection malfunctions when the excitation inrush current is the largest.

[0133] (2) The target converter transformer may be set to operate in the photovoltaic field under the condition of zero power;

[0134] For example, when the photovoltaic power is 0, the second harmonic content is the largest, which can simulate the working condition with the largest harmonic content during steady-state operation.

[0135] (3) The target converter transformer may be set to operate under rated power conditions in a photovoltaic field.

[0136] For example, when the PV power is rated, the AC current flowing through the converter transformer is maximum, simulating the operating condition at the maximum AC current.

[0137] The target converter transformer may be tested under any one or more simulation environments described above, and it may be determined whether the converter transformer protection of the target converter transformer has malfunctioned under the preset third simulation environment.

[0138] If the converter transformer protection of the target converter transformer malfunctions under the preset third simulation environment, it means that the converter transformer protection of the target converter transformer may be affected by the new energy station and easily cause malfunction of the protection, then step S305 can be executed.

[0139] Step S305, determining that the converter transformer protection of the target converter transformer is affected by the new energy station, which is prone to cause protection malfunction, and the target converter transformer fails the detection.

[0140] Specifically, from the above introduction, it can be seen that the method provided in the embodiment of the present application can test the target converter transformer under the preset third simulation environment introduced above, and determine whether the converter transformer protection of the target converter transformer has malfunction under the preset third simulation environment.

[0141] If it is determined that the converter transformer protection of the target converter transformer has malfunction under the preset third simulation environment, it means that the converter transformer protection of the target converter transformer may be affected by the new energy station, which may easily cause malfunction of the protection. Therefore, it can be determined that the converter transformer protection of the target converter transformer is affected by the new energy station, which may easily cause malfunction of the protection, and the target converter transformer fails the detection.

[0142] From the technical solutions introduced above, it can be seen that the method provided in the embodiment of the present application can test the adaptability of the converter transformer protection provided by the converter transformer in the power grid environment dominated by new energy stations at the sending end according to the type of new energy stations, so that the converter transformer can provide better converter transformer protection for the power grid environment dominated by new energy stations at the sending end, which is beneficial to maintaining the safety and stability of the power grid environment dominated by new energy stations at the sending end, and is also beneficial to protecting the converter transformer and improving the equipment life of the converter transformer.

[0143] From the above introduction, it can be known that the method provided in the embodiment of the present application can test the target converter transformer under the preset third simulation environment introduced above, and determine whether the converter transformer protection of the target converter transformer has malfunction under the preset third simulation environment. In actual application, when the converter transformer protection of the target converter transformer has no malfunction under the preset third simulation environment, the implementation method of the method provided in the embodiment of the present application may be different. Next, the process is introduced, which may include the following steps:

[0144] Step S401, if the converter transformer protection of the target converter transformer has no malfunction under the preset third simulation environment, determine whether the converter transformer protection of the target converter transformer has an exit problem under any power curve of the photovoltaic station.

[0145] Specifically, from the above introduction, it can be seen that the method provided in the embodiment of the present application can test the target converter transformer under the preset third simulation environment introduced above, and determine whether the converter transformer protection of the target converter transformer has malfunction under the preset third simulation environment.

[0146] In actual application, when the converter transformer protection of the target converter transformer does not malfunction under the preset third simulation environment, it is still uncertain whether the target converter transformer can adapt to the photovoltaic station. It is necessary to further judge whether the converter transformer protection of the target converter transformer has an exit problem under any power curve of the photovoltaic station.

[0147] If the converter transformer protection of the target converter transformer has a problem of exiting at any power curve of the photovoltaic station, it means that the converter transformer protection of the target converter transformer is affected by the new energy station and is prone to cause protection exit. Therefore, step S402 can be executed.

[0148] If the converter transformer protection of the target converter transformer does not exit at any power curve of the photovoltaic station, it means that the converter transformer protection of the target converter transformer is not easily affected by the photovoltaic station, and step S403 can be executed.

[0149] Step S402, determining that the converter transformer protection of the target converter transformer is affected by the new energy station, which is likely to cause protection exit, and the target converter transformer fails the detection.

[0150] Specifically, from the above introduction, it can be seen that when it is determined that the converter transformer protection of the target converter transformer has not malfunctioned under the preset third simulation environment, the method provided in the embodiment of the present application can further determine whether there is a problem of exiting the converter transformer protection of the target converter transformer under any power curve of the photovoltaic station.

[0151] If the converter transformer protection of the target converter transformer has the problem of exiting at any power curve of the photovoltaic station, it means that the converter transformer protection of the target converter transformer is affected by the new energy station, which is easy to cause the protection to exit. Therefore, it can be determined that the converter transformer protection of the target converter transformer is affected by the new energy station, which is easy to cause the protection to exit, and the target converter transformer fails the detection.

[0152] Step S403, determining that the converter transformer protection of the target converter transformer is not easily affected by the photovoltaic station, and the target converter transformer meets the adaptability requirements of the photovoltaic station.

[0153] Specifically, from the above introduction, it can be seen that when it is determined that the converter transformer protection of the target converter transformer has not malfunctioned under the preset third simulation environment, the method provided in the embodiment of the present application can further determine whether there is a problem of exiting the converter transformer protection of the target converter transformer under any power curve of the photovoltaic station.

[0154] If the converter transformer protection of the target converter transformer has the problem of exiting at any power curve of the photovoltaic station, it means that the converter transformer protection of the target converter transformer is affected by the new energy station, which is easy to cause the protection to exit. Therefore, it can be determined that the converter transformer protection of the target converter transformer is affected by the new energy station, which is easy to cause the protection to exit, and the target converter transformer fails the detection.

[0155] From the technical solutions introduced above, it can be seen that the method provided in the embodiment of the present application can test the adaptability of the converter transformer protection provided by the converter transformer in the power grid environment dominated by new energy stations at the sending end according to the type of new energy stations, so that the converter transformer can provide better converter transformer protection for the power grid environment dominated by new energy stations at the sending end, which is beneficial to maintaining the safety and stability of the power grid environment dominated by new energy stations at the sending end, and is also beneficial to protecting the converter transformer and improving the equipment life of the converter transformer.

[0156] From the above introduction, it can be seen that the method provided in the embodiment of the present application can determine whether the sampling circuit of the target converter transformer passes through a software filter or a hardware filter. In actual application, if the sampling circuit used by the target converter transformer passes through a software filter or a hardware filter, the method provided in the embodiment of the present application will be different for testing the target converter transformer. Next, the process is introduced, which may include the following steps:

[0157] Step S501: If the sampling circuit used by the target converter transformer passes through a software filter or a hardware filter, it is determined whether the software filter or the hardware filter filters the second harmonic.

[0158] Specifically, it can be seen from the above introduction that the method provided in the embodiment of the present application can determine whether the sampling circuit of the target converter transformer passes through a software filter or a hardware filter.

[0159] In actual application, if the sampling circuit of the target converter transformer passes through a software filter or a hardware filter, the target converter transformer will not be affected by the secondary harmonics generated by the new energy station. Therefore, after determining whether the sampling circuit of the target converter transformer passes through a software filter or a hardware filter, it can be further determined whether the software filter or the hardware filter filters the secondary harmonics.

[0160] If the software filter or the hardware filter filters the second harmonic, it means that the target converter transformer is not affected by the second harmonic generated by the new energy station, so the new simulation environment can be used to test the target converter transformer, and step 502 can be executed.

[0161] Step S502: testing the target converter transformer using a preset fourth simulation environment.

[0162] Specifically, from the above introduction, it can be seen that the method provided in the embodiment of the present application can further determine whether the software filter or the hardware filter filters the second harmonic after determining whether the sampling circuit of the target converter transformer passes through the software filter or the hardware filter.

[0163] If it is determined that the software filter or the hardware filter filters the second harmonic, it means that the target converter transformer is not affected by the second harmonic generated by the new energy station, and the preset fourth simulation environment can be used to test the target converter transformer.

[0164] The preset fourth simulation environment may be set as an environment for RTDS fault simulation.

[0165] For example, the preset fourth simulation environment may be configured to set various fault points of the converter transformer in the RTDS:

[0166] For example, single-phase grounding, two-phase short circuit, two-phase short circuit grounding, and three-phase short circuit grounding on the grid side; single-phase grounding, two-phase short circuit, two-phase short circuit grounding, and three-phase short circuit grounding on the valve side. When the new energy station emits rated power, the above fault points are simulated to occur respectively.

[0167] Step S503, determining whether the switch overcurrent protection and differential protection of the target converter transformer have an increased delay under the preset fourth simulation environment.

[0168] Specifically, from the above introduction, it can be seen that the method provided in the embodiment of the present application can test the target converter transformer under a preset fourth simulation environment, thereby further determining whether the switch overcurrent protection and differential protection of the target converter transformer have increased delays under the preset fourth simulation environment. If, under the preset fourth simulation environment, the switch overcurrent protection and differential protection of the target converter transformer do not have increased delays, it means that the target converter transformer can adapt to the new energy station, and thus step S504 can be executed.

[0169] Step S504, determining whether the target converter transformer has passed the inspection.

[0170] Specifically, from the above introduction, it can be seen that the method provided in the embodiment of the present application can test the target converter transformer under a preset fourth simulation environment, thereby further determining whether the switch overcurrent protection and differential protection of the target converter transformer have increased delays under the preset fourth simulation environment. If, under the preset fourth simulation environment, the switch overcurrent protection and differential protection of the target converter transformer do not have increased delays, it means that the target converter transformer can adapt to the new energy station, and it can be determined that the target converter transformer has passed the inspection.

[0171] From the technical solutions introduced above, it can be seen that the method provided in the embodiment of the present application can test the adaptability of the converter transformer protection provided by the converter transformer in the power grid environment dominated by new energy stations at the sending end according to the type of new energy stations, so that the converter transformer can provide better converter transformer protection for the power grid environment dominated by new energy stations at the sending end, which is beneficial to maintaining the safety and stability of the power grid environment dominated by new energy stations at the sending end, and is also beneficial to protecting the converter transformer and improving the equipment life of the converter transformer.

[0172] From the above introduction, it can be seen that the method provided in the embodiment of the present application can test the target converter transformer under the preset fourth simulation environment, thereby further judging whether the switch overcurrent protection and differential protection of the target converter transformer have an increased delay under the preset fourth simulation environment. If the switch overcurrent protection and differential protection of the target converter transformer have an increased delay under the preset fourth simulation environment, the implementation method of the method provided in the embodiment of the present application may be different. Next, the process is introduced, which may include the following steps:

[0173] Step S701: If, under the preset fourth simulation environment, the switch overcurrent protection and the differential protection of the target converter transformer have an increased delay, it is determined whether the increased delay exceeds the equipment tolerance of the target converter transformer.

[0174] Specifically, from the above introduction, it can be seen that the method provided in the embodiment of the present application can test the target converter transformer under a preset fourth simulation environment, thereby further determining whether the switch overcurrent protection and differential protection of the target converter transformer have increased delay under the preset fourth simulation environment.

[0175] If in the preset fourth simulation environment, the switch overcurrent protection and differential protection of the target converter transformer have increased delays, it is not enough to say whether the target converter transformer is affected by the secondary harmonics generated by the new energy station and cannot adapt to the needs of the new energy station. It is necessary to further judge whether the increased delay exceeds the equipment tolerance of the target converter transformer. If the increased delay does not exceed the equipment tolerance of the target converter transformer, it means that although the target converter transformer is affected by the secondary harmonics generated by the new energy station, it can still adapt to the environment of the new energy station, and step S702 can be executed.

[0176] If the increased delay exceeds the equipment tolerance of the target converter transformer, it means that the impact of the secondary harmonics generated by the new energy station has exceeded the equipment tolerance of the target converter transformer, and the target converter transformer does not meet the needs of the new energy station.

[0177] Step S702: determine whether the target converter transformer is qualified.

[0178] Specifically, from the above introduction, it can be seen that if in the preset fourth simulation environment, the switch overcurrent protection and differential protection of the target converter transformer have increased delays, it can be further determined whether the increased delay exceeds the equipment tolerance of the target converter transformer. When it is determined that the increased delay does not exceed the equipment tolerance of the target converter transformer, it means that although the target converter transformer is affected by the secondary harmonics generated by the new energy station, it can still adapt to the environment of the new energy station. Therefore, it can be determined that the target converter transformer has passed the inspection.

[0179] Step S703, determining that the commutation protection software filtering or hardware filtering of the target converter transformer will cause the differential protection or overcurrent protection of the target converter transformer to fail to operate, and the target converter transformer fails the detection.

[0180] Specifically, from the above introduction, it can be known that if in the preset fourth simulation environment, the switch overcurrent protection and differential protection of the target converter transformer have increased delays, it can be further determined whether the increased delay exceeds the equipment tolerance of the target converter transformer. When it is determined that the increased delay exceeds the equipment tolerance of the target converter transformer, it means that the target converter transformer is affected by the secondary harmonics generated by the new energy station, and the secondary harmonics generated by the new energy have a great impact on the target converter transformer, which is sufficient to destroy the target converter transformer. The commutation protection software filtering or hardware filtering of the target converter transformer will cause the differential protection or overcurrent protection of the target converter transformer to refuse to operate, thereby determining that the target converter transformer has failed the detection.

[0181] From the technical solutions introduced above, it can be seen that the method provided in the embodiment of the present application can test the adaptability of the converter transformer protection provided by the converter transformer in the power grid environment dominated by new energy stations at the sending end according to the type of new energy stations, so that the converter transformer can provide better converter transformer protection for the power grid environment dominated by new energy stations at the sending end, which is beneficial to maintaining the safety and stability of the power grid environment dominated by new energy stations at the sending end, and is also beneficial to protecting the converter transformer and improving the equipment life of the converter transformer.

[0182] The converter transformer testing device provided in an embodiment of the present application is described below. The converter transformer testing device described below and the converter transformer testing method described above can refer to each other.

[0183] See also Figure 3 , Figure 3 A schematic diagram of the structure of a converter transformer testing device disclosed in an embodiment of the present application.

[0184] like Figure 3 As shown, the converter transformer testing device may include:

[0185] A first determining unit 101 is used to determine a test point for sampling a converter transformer protection of a target converter transformer;

[0186] The second determination unit 102 is used to determine the amount of AC current and voltage affected by the new energy station;

[0187] A first testing unit 103 is used to test the target converter transformer using a preset first simulation environment, and collect a first differential protection action time and a first action result of the target converter transformer;

[0188] A comparing unit 104, configured to compare the first differential protection action time and the first action result with a preset protection action time and a preset braking value, respectively, to obtain a first target comparison result;

[0189] A first judging unit 105, configured to judge whether the first target comparison result exceeds a preset first threshold;

[0190] The first analysis unit 106 is used to determine that the converter transformer protection of the target converter transformer is not easily affected by the wind farm when the execution result of the first judgment unit is that the first target comparison result does not exceed the preset first threshold, and the target converter transformer meets the adaptability requirements of the wind farm.

[0191] It can be seen from the technical solution introduced above that when it is necessary to test whether the converter transformer protection provided by the target converter transformer in the new energy station is suitable for the new energy station, the device provided in the embodiment of the present application can use the first determination unit 101 to determine the test point for sampling the converter transformer protection of the target converter transformer; at the same time, the second determination unit 102 can be used to determine the AC current and voltage affected by the new energy station; after determining the test point for sampling the protection of the target converter transformer and the AC current and voltage affected by the new energy station, the first test unit 103 can be used to use a preset first simulation environment to test the target converter transformer, and collect the first differential protection action time and the AC voltage of the target converter transformer. First action result; after collecting the first differential protection action time and the first action result of the target converter transformer, the first differential protection action time and the first action result can be compared with the preset protection action time and the preset braking value respectively by using the comparison unit 104, and after obtaining the first target comparison result; the first judgment unit 105 can be used to judge whether the first target comparison result exceeds the preset first threshold; if the first target comparison result does not exceed the preset first threshold, the first analysis unit 106 can be used to determine that the converter transformer protection of the target converter transformer is not easily affected by the wind farm station, and the target converter transformer meets the adaptability requirements of the wind farm station.

[0192] The device provided in the embodiment of the present application can test the adaptability of the converter transformer protection provided by the converter transformer in the power grid environment dominated by new energy stations at the sending end according to the type of new energy stations, so that the converter transformer can provide better converter transformer protection for the power grid environment dominated by new energy stations at the sending end, which is beneficial to maintaining the security and stability of the power grid environment dominated by new energy stations at the sending end, and is also beneficial to protecting the converter transformer and increasing the equipment life of the converter transformer.

[0193] Further optionally, the device may also include:

[0194] a second judgment unit, configured to test the target converter transformer using a preset second simulation environment and judge whether the target converter transformer has a refusal to operate phenomenon when the execution result of the first judgment unit is that the first target comparison result exceeds the preset first threshold value;

[0195] The second analysis unit is used to determine that the converter transformer protection of the target converter transformer is affected by the wind farm and may cause the protection to fail to operate when the execution result of the second judgment unit is that the target converter transformer has a refusal to operate in the preset second simulated commutation, and the target converter transformer fails the detection.

[0196] The third analysis unit is used to determine that the converter transformer protection of the target converter transformer is not easily affected by the wind farm when the execution result of the second judgment unit is that the target converter transformer has no refusal to operate in the preset second simulated commutation, and the target converter transformer meets the adaptability requirements of the wind farm.

[0197] Further optionally, the device may also include:

[0198] A third judgment unit is used to judge whether the sampling circuit adopted by the target converter transformer passes through a software filter or a hardware filter;

[0199] a protection type determination unit, configured to determine a converter transformer protection type of the target converter transformer affected by the second harmonic when the execution result of the third judgment unit is that the sampling circuit adopted by the target converter transformer does not pass through a software filter or a hardware filter;

[0200] a fourth analysis unit, configured to analyze the reasons why the second harmonic affects the commutation transformer protection of the target converter transformer according to the commutation transformer protection type of the target converter transformer affected by the second harmonic;

[0201] A second testing unit, configured to test the target converter transformer using a preset third simulation environment;

[0202] A fourth judgment unit, used for judging whether the converter transformer protection of the target converter transformer has a malfunction under the preset third simulation environment;

[0203] The fifth analysis unit is used to determine that the converter transformer protection of the target converter transformer is affected by the new energy station and is prone to malfunction of protection when the execution result of the fourth judgment unit is that the converter transformer protection of the target converter transformer has malfunction under the preset third simulation environment, and the target converter transformer detection fails.

[0204] Further optionally, the device may also include:

[0205] A fifth judgment unit, for judging whether the commutation transformer protection of the target converter transformer has an exit problem at any power curve of the photovoltaic station when the execution result of the fourth judgment unit is that the commutation transformer protection of the target converter transformer has no malfunction under the preset third simulation environment;

[0206] The sixth analysis unit is used to determine that the converter transformer protection of the target converter transformer is affected by the new energy station and is prone to protection exit when the execution result of the fifth judgment unit is that there is a problem of exiting the converter transformer protection of the target converter transformer under any power curve of the photovoltaic station, and the target converter transformer fails the detection.

[0207] Further optionally, the device may also include:

[0208] The seventh analysis unit is used to determine that the converter transformer protection of the target converter transformer is not easily affected by the photovoltaic station when the execution result of the fifth judgment unit is that under any power curve of the photovoltaic station, there is no problem of exiting the converter transformer protection of the target converter transformer, and the target converter transformer meets the adaptability requirements of the photovoltaic station.

[0209] Further optionally, the device may also include:

[0210] a sixth judgment unit, configured to judge whether the software filter or the hardware filter filters the second harmonic when the execution result of the third judgment unit is that the sampling circuit adopted by the target converter transformer passes through the software filter or the hardware filter;

[0211] A third testing unit, configured to test the target converter transformer using a preset fourth simulation environment when the execution result of the sixth judging unit is that the software filter or the hardware filter filters the second harmonic;

[0212] a seventh judgment unit, configured to judge whether the switch overcurrent protection and the differential protection of the target converter transformer have an increased delay under the preset fourth simulation environment;

[0213] The eighth analysis unit is used to determine that the detection of the target converter transformer is qualified when the execution result of the seventh judgment unit is to determine that under the preset fourth simulation environment, the switch overcurrent protection and differential protection of the target converter transformer have no increased delay.

[0214] Further optionally, the device may also include:

[0215] an eighth judgment unit, configured to judge whether the increased delay exceeds the equipment tolerance capacity of the target converter transformer when the execution result of the seventh judgment unit is to determine that the switch overcurrent protection and the differential protection of the target converter transformer have an increased delay under the preset fourth simulation environment;

[0216] a ninth analyzing unit, configured to determine that the target converter transformer is qualified when the execution result of the eighth judging unit is to determine that the increased delay does not exceed the equipment tolerance capacity of the target converter transformer;

[0217] The tenth analysis unit is used to determine that, when the execution result of the eighth judgment unit is to determine that the increased delay exceeds the equipment tolerance capacity of the target converter transformer, the commutation protection software filtering or hardware filtering of the target converter transformer will cause the differential protection or overcurrent protection of the target converter transformer to refuse to operate, and the target converter transformer fails the detection.

[0218] Among them, the specific processing flow of each unit included in the above-mentioned converter transformer testing device can refer to the relevant introduction of the converter transformer testing method part above, and will not be repeated here.

[0219] The flow transformer testing device provided in the embodiment of the present application can be applied to flow transformer testing equipment, such as terminals: mobile phones, computers, etc. Optionally, Figure 4 The hardware structure diagram of the flow transformer test equipment is shown in FIG. Figure 4 The hardware structure of the flow transformer testing device may include: at least one processor 1, at least one communication interface 2, at least one memory 3 and at least one communication bus 4.

[0220] In the embodiment of the present application, the number of the processor 1 , the communication interface 2 , the memory 3 , and the communication bus 4 is at least one, and the processor 1 , the communication interface 2 , and the memory 3 communicate with each other through the communication bus 4 .

[0221] The processor 1 may be a central processing unit CPU, or an application-specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application, etc.;

[0222] The memory 3 may include a high-speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory;

[0223] The memory stores a program, and the processor can call the program stored in the memory, wherein the program is used to implement each processing flow in the aforementioned terminal flow transformer test solution.

[0224] An embodiment of the present application further provides a readable storage medium, which can store a program suitable for execution by a processor, wherein the program is used to: implement various processing flows of the aforementioned terminal in the flow transformer test solution.

[0225] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0226] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0227] The above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. The various embodiments can be combined with each other. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A converter transformer testing method, characterized in that: include: Determine the test points for sampling the converter transformer protection of the target converter transformer; Determine the amount of AC current and voltage affected by the new energy station; Using a preset first simulation environment to test the target converter transformer, and collecting a first differential protection action time and a first action result of the target converter transformer; Comparing the first differential protection action time and the first action result with a preset protection action time and a preset braking value respectively to obtain a first target comparison result; Determining whether the first target comparison result exceeds a preset first threshold; If the first target comparison result does not exceed the preset first threshold, it is determined that the converter transformer protection of the target converter transformer is not easily affected by the wind farm, and the target converter transformer meets the adaptability requirements of the wind farm; If the first target comparison result exceeds the preset first threshold, the method further includes: Using a preset second simulation environment to test the target converter transformer, and determining whether the target converter transformer has a refusal to operate phenomenon; If it is found that the target converter transformer has a refusal to operate phenomenon in the preset second simulation environment, it is determined that the converter transformer protection of the target converter transformer is affected by the wind farm and may cause the protection to fail to operate, and the target converter transformer fails the detection; If it is found that the target converter transformer has no refusal to operate in the preset second simulation environment, it is determined that the converter transformer protection of the target converter transformer is not easily affected by the wind farm, and the target converter transformer meets the adaptability requirements of the wind farm; The method further includes: Determining whether the sampling circuit adopted by the target converter transformer passes through a software filter or a hardware filter; If the sampling circuit used by the target converter transformer does not pass through a software filter or a hardware filter, determining a converter transformer protection type of the target converter transformer affected by the second harmonic; According to the type of converter transformer protection of the target converter transformer affected by the second harmonic, analyzing the reasons why the second harmonic affects the converter transformer protection of the target converter transformer; Using a preset third simulation environment to test the target converter transformer; Determine whether the converter transformer protection of the target converter transformer has a malfunction under the preset third simulation environment; If the converter transformer protection of the target converter transformer has a malfunction under the preset third simulation environment, it is determined that the converter transformer protection of the target converter transformer is affected by the new energy station and is prone to malfunction of the protection, and the target converter transformer fails the detection; If the sampling circuit used by the target converter transformer passes through a software filter or a hardware filter, determining whether the software filter or the hardware filter filters the second harmonic; If the software filter or the hardware filter filters the second harmonic, the target converter transformer is tested using a preset fourth simulation environment; Determine whether the switch overcurrent protection and the differential protection of the target converter transformer have an increased delay under the preset fourth simulation environment; If, under the preset fourth simulation environment, the switch overcurrent protection and the differential protection of the target converter transformer do not increase the delay, it is determined that the detection of the target converter transformer is qualified.

2. The method according to claim 1, characterized in that The method further includes: If the converter transformer protection of the target converter transformer has no malfunction under the preset third simulation environment, then determining whether the converter transformer protection of the target converter transformer has an exit problem at any power curve of the photovoltaic station; If the converter transformer protection of the target converter transformer has a problem of exiting at any power curve of the photovoltaic station, it is determined that the converter transformer protection of the target converter transformer is affected by the new energy station, which is likely to cause protection exit, and the target converter transformer fails the detection.

3. The method according to claim 2, characterized in that The method further includes: If the converter transformer protection of the target converter transformer does not have the problem of exiting under any power curve of the photovoltaic station, it is determined that the converter transformer protection of the target converter transformer is not easily affected by the photovoltaic station, and the target converter transformer meets the adaptability requirements of the photovoltaic station.

4. The method according to claim 1, characterized in that: The method further includes: If, under the preset fourth simulation environment, the switch overcurrent protection and the differential protection of the target converter transformer have an increased delay, determining whether the increased delay exceeds the equipment tolerance of the target converter transformer; If the increased delay does not exceed the equipment tolerance of the target converter transformer, it is determined that the target converter transformer has passed the inspection; If the increased delay exceeds the equipment tolerance of the target converter transformer, it is determined that the commutation protection software filtering or hardware filtering of the target converter transformer will cause the differential protection or overcurrent protection of the target converter transformer to fail to operate, and the target converter transformer fails the detection.

5. A converter transformer testing device, used to implement the converter transformer testing method according to any one of claims 1 to 4, characterized in that: include: A first determination unit is used to determine a test point for sampling a converter transformer protection of a target converter transformer; A second determination unit is used to determine the amount of alternating current and voltage affected by the new energy station; A first testing unit, configured to test the target converter transformer by using a preset first simulation environment, and collect a first differential protection action time and a first action result of the target converter transformer; A comparing unit, used for comparing the first differential protection action time and the first action result with a preset protection action time and a preset braking value respectively, to obtain a first target comparison result; A first judging unit, configured to judge whether the first target comparison result exceeds a preset first threshold; The first analysis unit is used to determine that the converter transformer protection of the target converter transformer is not easily affected by the wind farm when the execution result of the first judgment unit is that the first target comparison result does not exceed the preset first threshold value, and the target converter transformer meets the adaptability requirements of the wind farm.

6. A converter transformer testing device, characterized in that: include: one or more processors, and memory; The memory stores computer-readable instructions, and when the computer-readable instructions are executed by the one or more processors, the steps of the converter transformer testing method according to any one of claims 1 to 4 are implemented.

7. A readable storage medium, characterized in that: The readable storage medium stores computer-readable instructions, and when the computer-readable instructions are executed by one or more processors, the one or more processors implement the steps of the converter transformer testing method according to any one of claims 1 to 4.

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