A method and device for on-site detection of saturated reactor

Abstract

The present invention relates to the technical field of high-voltage direct current transmission, and specifically provides a method and device for on-site detection of saturated reactors, including: collecting high-frequency parameters of saturated reactors in operation, and analyzing abnormal conditions corresponding to the high-frequency parameters of the saturated reactors in operation; performing on-site detection of the saturated reactors in operation based on the abnormal conditions corresponding to the high-frequency parameters of the saturated reactors in operation; wherein the high-frequency parameters include: volt-second product, impulse inductance, and current ratio. The technical solution provided by the present invention can achieve accurate evaluation of the status of saturated reactors in operation and rapid identification of faults by understanding the performance changes of saturated reactors in operation through their high-frequency parameters, thereby ensuring safe and reliable operation of UHV DC converter valves.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage direct current power transmission, and in particular to a method and a device for on-site detection of a saturated reactor. Background Art

[0002] UHV DC transmission technology plays an irreplaceable role in long-distance, large-capacity power transmission and AC grid interconnection, and its stable and healthy operation is of great significance to the power grid. The converter valve is the core equipment of conventional DC transmission projects, and the saturated reactor is an important protection component in the converter valve. Its reliability is directly related to the long-term safe and stable operation of the DC transmission system.

[0003] With the increase of operating years, the aging problem of key components in the converter valve has become increasingly prominent. In recent years, saturated reactors in many DC projects have failed. For example, a large number of water pipes in the saturated reactors have leaked, the iron core has rusted, and even the chips have fallen apart. It is necessary to improve the water channel structure or to transform the reactor as a whole. Some saturated reactors in the converter valves have also experienced problems such as shell cracking and overheating, which has had a serious impact on the normal and stable operation of the DC project.

[0004] The main function of the saturated reactor is to suppress the rapid rise of the thyristor turn-on current and reduce the stress of the thyristor device by voltage division when the converter valve is subjected to transient voltage shock. It must not only withstand high-frequency impact voltage stress, but also circulate thousands of amperes of DC current for a long time. Therefore, in addition to the usual characteristic parameters of the reactor such as DC resistance and power frequency inductance, high-frequency impact characteristics are also the key performance of the saturated reactor. Due to the large number of characteristic parameters of the saturated reactor, the wide frequency distribution range of the measurement conditions (0~tens of kHz), the high voltage level (0~100kV), and the difficulty in designing integrated measurement equipment, there is still no effective on-site detection method for saturated reactors. As a result, many characteristics of the saturated reactor are in an unknown state after it is put into operation, and it is impossible to quantitatively analyze and judge the potential trend of characteristic changes, which brings great safety hazards to the project. Summary of the invention

[0005] In order to overcome the above defects, the present invention proposes a method and device for on-site detection of a saturated reactor.

[0006] In a first aspect, a method for on-site detection of a saturated reactor is provided, the method comprising:

[0007] Collect high-frequency parameters of saturated reactors in operation, and analyze abnormal conditions corresponding to the high-frequency parameters of saturated reactors in operation;

[0008] Performing on-site detection of the in-service saturated reactor based on abnormal conditions corresponding to high-frequency parameters of the in-service saturated reactor;

[0009] Wherein, the high frequency parameters include: volt-second product, impulse inductance, and current ratio;

[0010] Preferably, the on-site detection of the in-service saturated reactor based on the abnormal situation corresponding to the high-frequency parameter of the in-service saturated reactor includes:

[0011] When the abnormal conditions corresponding to the volt-second product and the impact inductance of the operating saturated reactor are abnormal, there is a turn-to-turn short-circuit fault in the operating saturated reactor;

[0012] When the current ratio of the operating saturated reactor corresponds to an abnormal situation, the operating saturated reactor has an excessive core loss fault;

[0013] When the abnormal conditions corresponding to the current ratio and impact inductance of the operating saturated reactor are abnormal, there is an air gap change fault or a clamp loose fault in the operating saturated reactor;

[0014] When the abnormal conditions corresponding to the volt-second product, impulse inductance and current ratio of the in-service saturated reactor are abnormal, there is a core loose piece fault in the in-service saturated reactor.

[0015] Preferably, the collecting of high-frequency parameters of the saturated reactor includes: performing an impulse discharge test on the saturated reactor.

[0016] Furthermore, when the converter station is shut down for maintenance, the impulse discharge test on the saturated reactor is performed.

[0017] Preferably, the analyzing of abnormal conditions corresponding to high-frequency parameters of the operating saturated reactor includes:

[0018] Obtain the time curve corresponding to the high-frequency parameters of the operating saturated reactor in the current test phase and the time curve corresponding to the high-frequency parameters in the previous test phase;

[0019] If the absolute value of the change amplitude of the time curve corresponding to the high-frequency parameters of the saturated reactor in the current test stage exceeds the first threshold value compared with the time curve corresponding to the high-frequency parameters in the previous test stage, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0020] Preferably, the analyzing of abnormal conditions corresponding to high-frequency parameters of the operating saturated reactor includes:

[0021] Obtain the time curve corresponding to the high-frequency parameters of the operating saturated reactor in the current test phase and the time curve corresponding to the high-frequency parameters in each historical test phase;

[0022] If the rate of change of the time curve corresponding to the high-frequency parameters of the saturated reactor in the current test stage compared with the time curve corresponding to the high-frequency parameters in the previous test stage and the average rate of change of the time curve corresponding to the high-frequency parameters in each historical test stage compared with the time curve corresponding to the high-frequency parameters in the previous test stage exceed the second threshold, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0023] Preferably, the analyzing of abnormal conditions corresponding to high-frequency parameters of the operating saturated reactor includes:

[0024] If the high-frequency parameters of the saturated reactor in operation do not satisfy the normal distribution in the current test phase, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0025] Preferably, the analyzing of abnormal conditions corresponding to high-frequency parameters of the operating saturated reactor includes:

[0026] If the distribution range of the high-frequency parameters of the saturated reactor in operation in the current test stage is different from the distribution range of the high-frequency parameters in the historical test stage, or the distribution range of the high-frequency parameters of the saturated reactor in operation in the current test stage is different from the distribution range of the high-frequency parameters of the saturated reactor in operation in the factory test stage, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0027] In a second aspect, a saturated reactor on-site detection device is provided, the saturated reactor on-site detection device comprising:

[0028] An analysis module, used to collect high-frequency parameters of the saturated reactor in operation and analyze abnormal conditions corresponding to the high-frequency parameters of the saturated reactor in operation;

[0029] A detection module, used for performing on-site detection of the saturated reactor in operation based on an abnormal condition corresponding to a high-frequency parameter of the saturated reactor in operation;

[0030] Wherein, the high frequency parameters include: volt-second product, impulse inductance, and current ratio;

[0031] Preferably, the detection module is specifically used for:

[0032] When the abnormal conditions corresponding to the volt-second product and the impact inductance of the operating saturated reactor are abnormal, there is a turn-to-turn short-circuit fault in the operating saturated reactor;

[0033] When the current ratio of the operating saturated reactor corresponds to an abnormal situation, the operating saturated reactor has an excessive core loss fault;

[0034] When the abnormal conditions corresponding to the current ratio and impact inductance of the operating saturated reactor are abnormal, there is an air gap change fault or a clamp loose fault in the operating saturated reactor;

[0035] When the abnormal conditions corresponding to the volt-second product, impulse inductance and current ratio of the in-service saturated reactor are abnormal, there is a core loose piece fault in the in-service saturated reactor.

[0036] Preferably, the device comprises: an experimental module for performing an impulse discharge test on a saturated reactor.

[0037] Furthermore, when the converter station is shut down for maintenance, the experimental module is executed.

[0038] Preferably, the analysis module is specifically used for:

[0039] Obtain the time curve corresponding to the high-frequency parameters of the operating saturated reactor in the current test phase and the time curve corresponding to the high-frequency parameters in the previous test phase;

[0040] If the absolute value of the change amplitude of the time curve corresponding to the high-frequency parameters of the saturated reactor in the current test stage exceeds the first threshold value compared with the time curve corresponding to the high-frequency parameters in the previous test stage, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0041] Preferably, the analysis module is specifically used for:

[0042] Obtain the time curve corresponding to the high-frequency parameters of the operating saturated reactor in the current test phase and the time curve corresponding to the high-frequency parameters in each historical test phase;

[0043] If the rate of change of the time curve corresponding to the high-frequency parameters of the saturated reactor in the current test stage compared with the time curve corresponding to the high-frequency parameters in the previous test stage and the average rate of change of the time curve corresponding to the high-frequency parameters in each historical test stage compared with the time curve corresponding to the high-frequency parameters in the previous test stage exceed the second threshold, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0044] Preferably, the analysis module is specifically used for:

[0045] If the high-frequency parameters of the saturated reactor in operation do not satisfy the normal distribution in the current test phase, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0046] Preferably, the analysis module is specifically used for:

[0047] If the distribution range of the high-frequency parameters of the saturated reactor in operation in the current test stage is different from the distribution range of the high-frequency parameters in the historical test stage, or the distribution range of the high-frequency parameters of the saturated reactor in operation in the current test stage is different from the distribution range of the high-frequency parameters of the saturated reactor in operation in the factory test stage, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0048] In a third aspect, a computer device is provided, comprising: one or more processors;

[0049] The processor is configured to execute one or more programs;

[0050] When the one or more programs are executed by the one or more processors, the on-site detection method of the saturated reactor is implemented.

[0051] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed, the on-site detection method of the saturated reactor is implemented.

[0052] The above one or more technical solutions of the present invention have at least one or more of the following beneficial effects:

[0053] The present invention provides a method and device for on-site detection of saturated reactors, including: collecting high-frequency parameters of saturated reactors in operation, and analyzing abnormal conditions corresponding to the high-frequency parameters of the saturated reactors in operation; performing on-site detection of the saturated reactors in operation based on the abnormal conditions corresponding to the high-frequency parameters of the saturated reactors in operation; wherein the high-frequency parameters include: volt-second product, impulse inductance, and current ratio. The technical solution provided by the present invention can grasp the performance changes of saturated reactors in operation through the high-frequency parameters of saturated reactors in operation, realize accurate evaluation of the status of saturated reactors in operation and rapid identification of faults, provide effective technical guidance for various links such as design and selection, experimental testing, operation and maintenance of saturated reactors, better promote the development of ultra-high voltage direct current transmission technology and product upgrades, and play a very important role in ensuring the safety and stability of large power grid systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic flow chart of main steps of the on-site detection method of a saturated reactor according to an embodiment of the present invention;

[0055] Figure 2 is a mapping relationship diagram of common faults of the reactor and changes in electrical parameters according to an embodiment of the present invention;

[0056] Figure 3 It is a fault diagram corresponding to an abnormal electrical parameter in an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0058] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0059] As disclosed in the background technology, UHV DC transmission technology plays an irreplaceable role in long-distance large-capacity power transmission and AC power grid interconnection, and its stable and healthy operation is of great significance to the power grid. The converter valve is the core equipment of conventional DC transmission projects, and the saturated reactor is an important protection element in the converter valve. Its reliability is directly related to the long-term safe and stable operation of the DC transmission system.

[0060] With the increase of operating years, the aging problem of key components in the converter valve has become increasingly prominent. In recent years, saturated reactors in many DC projects have failed. For example, a large number of water pipes in the saturated reactors have leaked, the iron core has rusted, and even the chips have fallen apart. It is necessary to improve the water channel structure or to transform the reactor as a whole. Some saturated reactors in the converter valves have also experienced problems such as shell cracking and overheating, which has had a serious impact on the normal and stable operation of the DC project.

[0061] The main function of the saturated reactor is to suppress the rapid rise of the thyristor turn-on current and reduce the stress of the thyristor device by voltage division when the converter valve is subjected to transient voltage shock. It must not only withstand high-frequency impact voltage stress, but also circulate thousands of amperes of DC current for a long time. Therefore, in addition to the usual characteristic parameters of the reactor such as DC resistance and power frequency inductance, high-frequency impact characteristics are also the key performance of the saturated reactor. Due to the large number of characteristic parameters of the saturated reactor, the wide frequency distribution range of the measurement conditions (0~tens of kHz), the high voltage level (0~100kV), and the difficulty in designing integrated measurement equipment, there is still no effective on-site detection method for saturated reactors. As a result, many characteristics of the saturated reactor are in an unknown state after it is put into operation, and it is impossible to quantitatively analyze and judge the potential trend of characteristic changes, which brings great safety hazards to the project.

[0062] In order to improve the above problems, the present invention provides a method and device for on-site detection of saturated reactors, including: collecting high-frequency parameters of saturated reactors in operation, and analyzing abnormal conditions corresponding to the high-frequency parameters of saturated reactors in operation; performing on-site detection of the saturated reactors in operation based on the abnormal conditions corresponding to the high-frequency parameters of the saturated reactors in operation; wherein the high-frequency parameters include: volt-second product, impulse inductance, and current ratio. The technical solution provided by the present invention can grasp the performance changes of saturated reactors in operation through the high-frequency parameters of saturated reactors in operation, realize accurate evaluation of the status of saturated reactors in operation and rapid identification of faults, provide effective technical guidance for various links such as design and selection, experimental testing, operation and maintenance of saturated reactors, better promote the development of UHV DC transmission technology and product upgrading and transformation, and play a very important role in ensuring the safety and stability of large power grid systems.

[0063] The above scheme is described in detail below.

[0064] Example 1

[0065] See attached Figure 1 , Figure 1 FIG. 1 is a flow chart showing the main steps of a method for on-site detection of a saturated reactor according to an embodiment of the present invention. Figure 1 As shown, the on-site detection method of the saturated reactor in the embodiment of the present invention mainly includes the following steps:

[0066] Step S101: collecting high-frequency parameters of the operating saturated reactor, and analyzing abnormal conditions corresponding to the high-frequency parameters of the operating saturated reactor;

[0067] Step S102: performing on-site detection of the in-service saturated reactor based on the abnormal conditions corresponding to the high-frequency parameters of the in-service saturated reactor;

[0068] Wherein, the high frequency parameters include: volt-second product, impulse inductance, and current ratio.

[0069] In this embodiment, the acquisition of high-frequency parameters of the saturated reactor includes: performing an impulse discharge test on the saturated reactor. Specifically:

[0070] The saturated reactor is a nonlinear element, which works in the magnetic saturation region for a long time, and the working voltage in the steady state is a periodic high-frequency pulse voltage stress. Therefore, the volt-second product, impulse inductance, and current ratio of the saturated reactor under high frequency directly determine the performance of the reactor under the actual operating conditions of the converter valve. In the factory test, the high-frequency impulse discharge test can be used to measure the volt-second product, impulse inductance, current ratio and other parameters of the saturated reactor, which is one of the key tests for detecting the high-frequency characteristics of the reactor. And the simulation test in the laboratory also shows that when the reactor has common faults such as increased core loss, short circuit between winding turns, and change in core air gap, the electrical characteristics under impulse discharge will change. Therefore, the high-frequency impulse discharge test can be used as the main technical means for on-site detection and performance evaluation of saturated reactors.

[0071] The impulse discharge test voltage level in the factory is high, and the measuring equipment is bulky, so it cannot be directly used for on-site detection of the converter station. For this reason, the present invention uses a portable on-site detection device for saturated reactors suitable for the engineering site. The device is compact and integrates test, measurement, data processing, display and other functions. The reactor can be tested without removing the reactor wiring, which greatly reduces the difficulty of maintenance and improves the maintenance efficiency. The capacity and voltage level of the detection device are designed and selected to be lower than the in-plant test device, which can further control the difficulty and risk of on-site test implementation, but can still excite the saturated reactor to saturation and obtain its electrical parameters at high frequency.

[0072] Conduct field tests, and adjust the test voltage level according to different reactor models. After each test, the saturated reactor field detection device performs real-time data post-processing to directly obtain the high-frequency characteristic parameters of the saturated reactor. Several tests can be performed on a single test product; when extracting test data, the average value of one or more test data can be taken as the final test result.

[0073] In one embodiment, when the converter station is shut down for maintenance, the impulse discharge test on the saturated reactor is performed.

[0074] In a specific implementation, on-site inspection of saturated reactors can be carried out when the converter station is shut down for maintenance. The sampling ratio and sampling method of the reactors can refer to the sampling inspection methods of other components of the DC converter valve, such as thyristors, damping capacitors, etc. For example, any valve tower is randomly selected to inspect all the reactors of the valve tower; or commonly used sampling methods such as random sampling, stratified sampling, overall sampling, systematic sampling, etc. are used.

[0075] In this embodiment, the analysis of the abnormal situation corresponding to the high-frequency parameters of the saturated reactor in operation includes:

[0076] Obtain the time curve corresponding to the high-frequency parameters of the operating saturated reactor in the current test phase and the time curve corresponding to the high-frequency parameters in the previous test phase;

[0077] If the absolute value of the change amplitude of the time curve corresponding to the high-frequency parameters of the saturated reactor in the current test stage exceeds the first threshold value compared with the time curve corresponding to the high-frequency parameters in the previous test stage, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0078] In this embodiment, the analysis of the abnormal situation corresponding to the high-frequency parameters of the saturated reactor in operation includes:

[0079] Obtain the time curve corresponding to the high-frequency parameters of the operating saturated reactor in the current test phase and the time curve corresponding to the high-frequency parameters in each historical test phase;

[0080] If the rate of change of the time curve corresponding to the high-frequency parameters of the saturated reactor in the current test stage compared with the time curve corresponding to the high-frequency parameters in the previous test stage and the average rate of change of the time curve corresponding to the high-frequency parameters in each historical test stage compared with the time curve corresponding to the high-frequency parameters in the previous test stage exceed the second threshold, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0081] In this embodiment, the analysis of the abnormal situation corresponding to the high-frequency parameters of the saturated reactor in operation includes:

[0082] If the high-frequency parameters of the saturated reactor in operation do not satisfy the normal distribution in the current test phase, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0083] In this embodiment, the analysis of the abnormal situation corresponding to the high-frequency parameters of the saturated reactor in operation includes:

[0084] If the distribution range of the high-frequency parameters of the saturated reactor in operation in the current test stage is different from the distribution range of the high-frequency parameters in the historical test stage, or the distribution range of the high-frequency parameters of the saturated reactor in operation in the current test stage is different from the distribution range of the high-frequency parameters of the saturated reactor in operation in the factory test stage, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0085] In this embodiment, Figure 2The mapping relationship between the changes in the characteristic parameters of the reactor caused by some typical faults of the saturated reactor is given. The mapping relationship is established based on the fault simulation test carried out in the laboratory. The left side of the figure shows some common faults of the saturated reactor that have occurred since the operation of the UHV DC project. The main structure of the saturated reactor consists of a coil and an iron core, in which the coil is wound by several turns of metal wire; the iron core is usually wound by ultra-thin silicon steel strip. In order to reduce the residual magnetism of the iron core, a certain air gap is left in each pair of iron cores. After the air gap is filled and positioned with an air gap pad, the whole pair of iron cores are tied and fixed with a clamp. With the increase of the operating years, the saturated reactor will gradually age due to the effects of electricity, heat and mechanical stress. According to engineering experience, there will be short circuits between turns, increased iron loss caused by aging of the iron core insulation, changes in the air gap caused by vibration and wear of the reactor, loose core pieces caused by vibration or external impact, and loose clamps. The right side of the figure shows the high-frequency characteristic parameters of the saturated reactor, which can be obtained through impulse discharge tests, including parameters such as volt-second product, unsaturated inductance, and current ratio. When a saturated reactor fails, one or more characteristic parameters of the reactor will change. For example, a "turn-to-turn short circuit" fault will cause the volt-second product and unsaturated inductance value of the reactor to change, and so on.

[0086] Since one fault may cause abnormal changes in one or more electrical parameters, and there are also cases where different faults cause the same electrical parameter changes, Figure 2 By reverse deduction, we can get the common faults corresponding to different electrical parameter abnormalities, such as Figure 3 As shown. Including but not limited to the following corresponding relationships: 1) When the measured reactor has only abnormal volt-second product and impulse inductance, it is speculated that a turn-to-turn short circuit fault has occurred; 2) When the measured reactor has only abnormal current ratio, it is speculated that the core loss is too large; 3) When the measured reactor has only abnormal impulse inductance and current ratio, it is speculated that there are problems such as air gap change or loose clamp; 4) When the measured reactor has only abnormal volt-second product, impulse inductance, and current ratio, it is speculated that the core has loose pieces.

[0087] Finally, statistics on the abnormal parameters of the reactors were collected and compared with Figure 3 The mapping rules provided are used to complete the evaluation of potential faults of saturated reactors and then take the next step of treatment.

[0088] Therefore, the on-site detection of the saturated reactor in operation based on the abnormal situation corresponding to the high-frequency parameter of the saturated reactor in operation includes:

[0089] When the abnormal conditions corresponding to the volt-second product and the impact inductance of the operating saturated reactor are abnormal, there is a turn-to-turn short-circuit fault in the operating saturated reactor;

[0090] When the current ratio of the operating saturated reactor corresponds to an abnormal situation, the operating saturated reactor has an excessive core loss fault;

[0091] When the abnormal conditions corresponding to the current ratio and impact inductance of the operating saturated reactor are abnormal, there is an air gap change fault or a clamp loose fault in the operating saturated reactor;

[0092] When the abnormal conditions corresponding to the volt-second product, impulse inductance and current ratio of the in-service saturated reactor are abnormal, there is a core loose piece fault in the in-service saturated reactor.

[0093] Example 2

[0094] Based on the same inventive concept, the present invention also provides a saturated reactor on-site detection device, the saturated reactor on-site detection device comprising:

[0095] An analysis module, used to collect high-frequency parameters of the saturated reactor in operation and analyze abnormal conditions corresponding to the high-frequency parameters of the saturated reactor in operation;

[0096] A detection module, used for performing on-site detection of the saturated reactor in operation based on an abnormal condition corresponding to a high-frequency parameter of the saturated reactor in operation;

[0097] Wherein, the high frequency parameters include: volt-second product, impulse inductance, and current ratio.

[0098] Preferably, the device comprises: an experimental module for performing an impulse discharge test on a saturated reactor.

[0099] Furthermore, when the converter station is shut down for maintenance, the experimental module is executed.

[0100] Preferably, the analysis module is specifically used for:

[0101] Obtain the time curve corresponding to the high-frequency parameters of the operating saturated reactor in the current test phase and the time curve corresponding to the high-frequency parameters in the previous test phase;

[0102] If the absolute value of the change amplitude of the time curve corresponding to the high-frequency parameters of the saturated reactor in the current test stage exceeds the first threshold value compared with the time curve corresponding to the high-frequency parameters in the previous test stage, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0103] Preferably, the analysis module is specifically used for:

[0104] Obtain the time curve corresponding to the high-frequency parameters of the operating saturated reactor in the current test phase and the time curve corresponding to the high-frequency parameters in each historical test phase;

[0105] If the rate of change of the time curve corresponding to the high-frequency parameters of the saturated reactor in the current test stage compared with the time curve corresponding to the high-frequency parameters in the previous test stage and the average rate of change of the time curve corresponding to the high-frequency parameters in each historical test stage compared with the time curve corresponding to the high-frequency parameters in the previous test stage exceed the second threshold, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0106] Preferably, the analysis module is specifically used for:

[0107] If the high-frequency parameters of the saturated reactor in operation do not satisfy the normal distribution in the current test phase, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0108] Preferably, the analysis module is specifically used for:

[0109] If the distribution range of the high-frequency parameters of the saturated reactor in operation in the current test stage is different from the distribution range of the high-frequency parameters in the historical test stage, or the distribution range of the high-frequency parameters of the saturated reactor in operation in the current test stage is different from the distribution range of the high-frequency parameters of the saturated reactor in operation in the factory test stage, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

[0110] Preferably, the detection module is specifically used for:

[0111] When the abnormal conditions corresponding to the volt-second product and the impact inductance of the operating saturated reactor are abnormal, there is a turn-to-turn short-circuit fault in the operating saturated reactor;

[0112] When the current ratio of the operating saturated reactor corresponds to an abnormal situation, the operating saturated reactor has an excessive core loss fault;

[0113] When the abnormal conditions corresponding to the current ratio and impact inductance of the operating saturated reactor are abnormal, there is an air gap change fault or a clamp loose fault in the operating saturated reactor;

[0114] When the abnormal conditions corresponding to the volt-second product, impulse inductance and current ratio of the in-service saturated reactor are abnormal, there is a core loose piece fault in the in-service saturated reactor.

[0115] Example 3

[0116] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of a saturated reactor field detection method in the above embodiment.

[0117] Example 4

[0118] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in a computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of a saturated reactor field detection method in the above embodiment.

[0119] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0120] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0121] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0122] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for on-site detection of a saturated reactor, characterized in that: The method comprises: Collect high-frequency parameters of saturated reactors in operation, and analyze abnormal conditions corresponding to the high-frequency parameters of saturated reactors in operation; Performing on-site detection of the in-service saturated reactor based on abnormal conditions corresponding to high-frequency parameters of the in-service saturated reactor; Wherein, the high frequency parameters include: volt-second product, impulse inductance, and current ratio; The on-site detection of the in-service saturated reactor based on the abnormal situation corresponding to the high-frequency parameter of the in-service saturated reactor includes: When the abnormal conditions corresponding to the volt-second product and the impact inductance of the operating saturated reactor are abnormal, there is a turn-to-turn short-circuit fault in the operating saturated reactor; When the current ratio of the operating saturated reactor corresponds to an abnormal situation, the operating saturated reactor has an excessive core loss fault; When the abnormal conditions corresponding to the current ratio and impact inductance of the operating saturated reactor are abnormal, there is an air gap change fault or a clamp loose fault in the operating saturated reactor; When the abnormal conditions corresponding to the volt-second product, impulse inductance and current ratio of the in-service saturated reactor are abnormal, there is a core loose piece fault in the in-service saturated reactor.

2. The method according to claim 1, characterized in that The collecting of high frequency parameters of the saturated reactor before operation includes: performing an impulse discharge test on the saturated reactor.

3. The method according to claim 2, characterized in that When the converter station is shut down for maintenance, the impulse discharge test on the saturated reactor is performed.

4. The method according to claim 1, characterized in that The analysis of abnormal conditions corresponding to the high-frequency parameters of the saturated reactor in operation includes: Obtain the time curve corresponding to the high-frequency parameters of the operating saturated reactor in the current test phase and the time curve corresponding to the high-frequency parameters in the previous test phase; If the absolute value of the change amplitude of the time curve corresponding to the high-frequency parameters of the saturated inductor in the current test stage exceeds the first threshold value compared with the time curve corresponding to the high-frequency parameters in the previous test stage, then there is an abnormality in the high-frequency parameters of the saturated inductor; otherwise, there is no abnormality in the high-frequency parameters of the saturated inductor.

5. The method according to claim 1, characterized in that The analysis of abnormal conditions corresponding to the high-frequency parameters of the saturated reactor in operation includes: Obtain the time curve corresponding to the high-frequency parameters of the operating saturated reactor in the current test phase and the time curve corresponding to the high-frequency parameters in each historical test phase; If the rate of change of the time curve corresponding to the high-frequency parameters of the saturated reactor in the current test stage compared with the time curve corresponding to the high-frequency parameters in the previous test stage and the average rate of change of the time curve corresponding to the high-frequency parameters in each historical test stage compared with the time curve corresponding to the high-frequency parameters in the previous test stage exceed the second threshold, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

6. The method according to claim 1, characterized in that The analysis of abnormal conditions corresponding to the high-frequency parameters of the saturated reactor in operation includes: If the high-frequency parameters of the saturated reactor in operation do not satisfy the normal distribution in the current test phase, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

7. The method according to claim 1, characterized in that The analysis of abnormal conditions corresponding to the high-frequency parameters of the saturated reactor in operation includes: If the distribution range of the high-frequency parameters of the saturated reactor in operation in the current test stage is different from the distribution range of the high-frequency parameters in the historical test stage, or the distribution range of the high-frequency parameters of the saturated reactor in operation in the current test stage is different from the distribution range of the high-frequency parameters of the saturated reactor in operation in the factory test stage, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

8. A saturated reactor on-site detection device, characterized in that: The device comprises: An analysis module, used to collect high-frequency parameters of the saturated reactor in operation and analyze abnormal conditions corresponding to the high-frequency parameters of the saturated reactor in operation; A detection module, used for performing on-site detection of the saturated reactor in operation based on an abnormal condition corresponding to a high-frequency parameter of the saturated reactor in operation; Wherein, the high frequency parameters include: volt-second product, impulse inductance, and current ratio; The detection module is specifically used for: When the abnormal conditions corresponding to the volt-second product and the impact inductance of the operating saturated reactor are abnormal, there is a turn-to-turn short-circuit fault in the operating saturated reactor; When the current ratio of the operating saturated reactor corresponds to an abnormal situation, the operating saturated reactor has an excessive core loss fault; When the abnormal conditions corresponding to the current ratio and impact inductance of the operating saturated reactor are abnormal, there is an air gap change fault or a clamp loose fault in the operating saturated reactor; When the abnormal conditions corresponding to the volt-second product, impulse inductance and current ratio of the in-service saturated reactor are abnormal, there is a core loose piece fault in the in-service saturated reactor.

9. The device according to claim 8, characterized in that The device comprises: an experimental module, which is used for carrying out an impulse discharge test on a saturated reactor.

10. The device according to claim 9, characterized in that When the converter station is shut down for maintenance, the experimental module is executed.

11. The device according to claim 8, characterized in that The analysis module is specifically used for: Obtain the time curve corresponding to the high-frequency parameters of the operating saturated reactor in the current test phase and the time curve corresponding to the high-frequency parameters in the previous test phase; If the absolute value of the change amplitude of the time curve corresponding to the high-frequency parameters of the saturated inductor in the current test stage exceeds the first threshold value compared with the time curve corresponding to the high-frequency parameters in the previous test stage, then there is an abnormality in the high-frequency parameters of the saturated inductor; otherwise, there is no abnormality in the high-frequency parameters of the saturated inductor.

12. The device according to claim 8, characterized in that The analysis module is specifically used for: Obtain the time curve corresponding to the high-frequency parameters of the operating saturated reactor in the current test phase and the time curve corresponding to the high-frequency parameters in each historical test phase; If the rate of change of the time curve corresponding to the high-frequency parameters of the saturated reactor in the current test stage compared with the time curve corresponding to the high-frequency parameters in the previous test stage and the average rate of change of the time curve corresponding to the high-frequency parameters in each historical test stage compared with the time curve corresponding to the high-frequency parameters in the previous test stage exceed the second threshold, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

13. The device according to claim 8, characterized in that The analysis module is specifically used for: If the high-frequency parameters of the saturated reactor in operation do not satisfy the normal distribution in the current test phase, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

14. The device according to claim 8, characterized in that The analysis module is specifically used for: If the distribution range of the high-frequency parameters of the saturated reactor in operation in the current test stage is different from the distribution range of the high-frequency parameters in the historical test stage, or the distribution range of the high-frequency parameters of the saturated reactor in operation in the current test stage is different from the distribution range of the high-frequency parameters of the saturated reactor in operation in the factory test stage, then there is an abnormality in the high-frequency parameters of the saturated reactor in operation; otherwise, there is no abnormality in the high-frequency parameters of the saturated reactor in operation.

15. A computer device, characterized in that: include: one or more processors; The processor is configured to execute one or more programs; When the one or more programs are executed by the one or more processors, the on-site detection method for a saturated reactor according to any one of claims 1 to 7 is implemented.

16. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the on-site detection method for a saturated reactor as claimed in any one of claims 1 to 7 is implemented.

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