Wind turbine generator insulation monitoring method and device and electronic equipment

Abstract

The invention provides a wind turbine generator insulation monitoring method and a related device, and the method comprises the steps: obtaining first control information and second control information after receiving a generator winding insulation monitoring command sent by a main control system; extracting first closing information and second closing information; if the first closing information indicates that the converter dry node is disconnected and the second closing information indicates that the main control dry node is disconnected, acquiring control information and parameter information of a wind turbine generator; determining an insulation monitoring mode according to the control information of the wind turbine generator and the parameter information of the wind turbine generator; and according to the insulation monitoring mode, carrying out insulation monitoring on the wind turbine generator. The technical problem that in the remote insulation measurement process of electrical equipment, due to the fact that the connection state between the electrical equipment possibly changes dynamically, accidental electrical connection is caused, short circuit is caused, and wind turbine generator equipment is damaged is solved.

Description

Technical Field

[0001] The present application relates to the technical field of generator equipment maintenance, and in particular to a method, device and electronic equipment for monitoring insulation of a wind turbine set. Background Art

[0002] With the rapid development and widespread application of wind power generation technology, the operational stability and safety of wind turbines have become the focus of the industry. During the long-term operation of wind turbines, the insulation performance of the generator windings may deteriorate due to environmental factors, mechanical vibration, electrical stress and other reasons. Therefore, it is particularly important to measure the insulation performance of electrical equipment.

[0003] It has become a common phenomenon to use insulation monitoring machines to perform remote insulation measurement on power generation equipment. However, during the remote insulation measurement process, the connection status between electrical equipment may be in dynamic change. For example, when the generator or related electrical equipment is not in a shutdown state, or the electrical connection of the equipment is not completely disconnected when insulation measurement is performed, a short circuit may occur due to an unexpected electrical connection. Once a short circuit occurs in the generator circuit, the wind turbine equipment may be damaged.

[0004] In view of this, the inventor proposes a method, device and electronic equipment for monitoring insulation of a wind turbine generator set. Summary of the invention

[0005] The embodiments of the present application provide a method, device and electronic equipment for monitoring the insulation of a wind turbine generator set to solve the technical problem in the prior art that, during the process of remote insulation measurement of electrical equipment, the connection status between electrical equipment may be in dynamic change, resulting in accidental electrical connection and causing short circuit and damage to the wind turbine generator set equipment.

[0006] A first aspect of an embodiment of the present application provides a method for monitoring insulation of a wind turbine generator set, which is applied to an insulation monitoring machine, and the method includes:

[0007] After receiving the generator winding insulation monitoring command sent by the main control system, first control information of the converter trunk node and second control information of the main control trunk node are obtained;

[0008] Extracting first closing information of the converter trunk node and second closing information of the main control trunk node from the first control information and the second control information respectively;

[0009] If the first closing information indicates that the converter trunk node is disconnected and the second closing information indicates that the main control trunk node is disconnected, then acquiring control information of the wind turbine generator and parameter information of the wind turbine generator;

[0010] Determine the insulation monitoring mode according to the control information of the wind turbine generator and the parameter information of the wind turbine generator;

[0011] According to the insulation monitoring mode, insulation monitoring is performed on the wind turbine generator.

[0012] Further, according to the control information of the wind turbine generator and the parameter information of the wind turbine generator, the insulation monitoring mode is determined, including:

[0013] According to the wind turbine generator parameter information, the maximum allowable short-circuit current of the generator winding is calculated;

[0014] Extracting the wind turbine generator speed from the wind turbine generator control information;

[0015] Calculate the real-time short-circuit current of the generator winding according to the generator speed and parameter information of the wind turbine generator;

[0016] The insulation monitoring mode is determined according to the real-time short-circuit current of the generator winding and the maximum allowable short-circuit current of the generator winding.

[0017] Furthermore, according to the parameter information of the wind turbine generator, the maximum allowable short-circuit current of the generator winding is calculated, including:

[0018] Extract winding material, size and insulation grade information from wind turbine generator parameter information;

[0019] Calculate the allowable short-circuit current of the generator winding based on the winding material, size and insulation grade information;

[0020] According to the allowable short-circuit current of the generator winding, determine the allowable short-circuit current margin of the generator winding;

[0021] The maximum allowable short-circuit current of the generator winding is calculated based on the allowable short-circuit current margin of the generator winding and the allowable short-circuit current of the generator winding.

[0022] Furthermore, according to the wind turbine generator speed and wind turbine generator parameter information, the real-time short-circuit current of the generator winding is calculated, including:

[0023] Calculate the real-time value of the short-circuit impedance according to the wind turbine generator speed and wind turbine generator parameter information;

[0024] Extract the rated voltage and rated current of the generator from the parameter information of the wind turbine generator;

[0025] The real-time short-circuit current of the generator winding is calculated based on the real-time value of the short-circuit impedance, the rated voltage and the rated current of the generator.

[0026] Furthermore, according to the real-time short-circuit current of the generator winding and the maximum allowable short-circuit current of the generator winding, the insulation monitoring mode is determined, including:

[0027] If the real-time short-circuit current of the generator winding is less than the maximum allowable short-circuit current of the generator winding, the insulation mode is determined to be the formal insulation monitoring mode;

[0028] If the real-time short-circuit current of the generator winding is greater than the maximum allowable short-circuit current of the generator winding, the insulation mode is determined to be the preparatory insulation monitoring mode.

[0029] Furthermore, the insulation monitoring mode is a formal insulation monitoring mode, and the insulation monitoring of the wind turbine generator according to the insulation monitoring mode includes:

[0030] The DC injection method is used to measure the insulation between the generator stator winding and the ground, the rotor winding and the ground, and the stator winding and the rotor winding;

[0031] Get the preset measurement interval time;

[0032] According to the preset measurement interval time, the above method of using the DC injection method to measure the insulation between the generator stator winding and the ground, the rotor winding and the ground, and the stator winding and the rotor winding is repeatedly executed until the insulation measurement end instruction is obtained.

[0033] Further, obtaining the preset measurement interval time includes:

[0034] Extract the real-time temperature information of the generator winding from the wind turbine generator control information;

[0035] The preset measurement interval time is determined according to the real-time temperature information of the generator winding.

[0036] Further, the insulation monitoring mode is a preparatory insulation monitoring mode, and the insulation monitoring of the wind turbine generator according to the insulation monitoring mode includes:

[0037] According to the maximum allowable short-circuit current of the generator, determine the maximum allowable short-circuit current generator speed;

[0038] According to the maximum allowable short-circuit current generator speed, adjust the generator speed to less than the maximum allowable short-circuit current generator speed, and wait to receive the generator winding insulation monitoring command sent by the main control system.

[0039] A second aspect of an embodiment of the present application provides a wind turbine insulation monitoring device, the device comprising:

[0040] A first acquisition unit, used to acquire control information of the converter trunk node and the main control trunk node;

[0041] A second acquisition unit, used to acquire wind turbine generator control information;

[0042] The first processing unit is used to determine the insulation monitoring mode according to the wind turbine generator control information.

[0043] A third aspect of an embodiment of the present application provides an electronic device, comprising a processor, an input device, an output device and a memory, wherein the processor, input device, output device and memory are interconnected, wherein the memory is used to store a machine program, wherein the machine program includes program instructions, and the processor is configured to call the program instructions to execute the step instructions of the wind turbine insulation monitoring method as described in the first aspect of the embodiment of the present application.

[0044] Beneficial effects:

[0045] The present invention provides a method, device and electronic equipment for monitoring the insulation of a wind turbine generator. In an example of the method, by obtaining first control information of a converter trunk node and second control information of a main control trunk node, the closing information performs a first protection information judgment. If the simultaneous disconnection condition is met, the control information of the wind turbine generator and the parameter information of the wind turbine generator are obtained to perform a second protection information judgment, thereby determining an insulation monitoring mode, and performing insulation monitoring on the generator according to the insulation monitoring mode. By performing the first protection information judgment and the second protection information judgment, it is ensured that the insulation of the generator can be effectively and safely monitored, and the circuit is avoided from being damaged due to the operating state of the generator during the insulation test, thereby solving the technical problem in the prior art that in the process of remote insulation measurement of electrical equipment, the connection state between the electrical equipment may be in dynamic change, resulting in accidental electrical connection and short circuit, which leads to damage to the wind turbine equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] 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 work.

[0047] Figure 1 A schematic diagram of the overall process of a wind turbine insulation monitoring method is provided for an embodiment of the present application;

[0048] Figure 2 A schematic diagram of a process for confirming an insulation monitoring mode of a wind turbine generator insulation monitoring method is provided for an embodiment of the present application;

[0049] Figure 3 A schematic diagram of a calculation process of a maximum allowable short-circuit current of a wind turbine insulation monitoring method is provided for an embodiment of the present application;

[0050] Figure 4 A schematic diagram of a calculation process of a real-time short-circuit current of a generator winding of a wind turbine generator insulation monitoring method is provided in an embodiment of the present application;

[0051] Figure 5 A specific flow chart of the process of confirming the insulation monitoring mode of a wind turbine insulation monitoring method is provided for the embodiment of the present application;

[0052] Figure 6 A schematic flow chart of a method for monitoring insulation of a wind turbine generator set being confirmed as a formal insulation monitoring mode is provided for an embodiment of the present application;

[0053] Figure 7 A schematic diagram of a calculation process of a preset interval time of a wind turbine insulation monitoring method is provided for an embodiment of the present application;

[0054] Figure 8 A schematic flow chart of a method for monitoring insulation of a wind turbine generator set in which the insulation monitoring mode is confirmed as a preliminary insulation monitoring mode is provided for an embodiment of the present application;

[0055] Fig. 9 A schematic diagram of overall wiring for generator insulation monitoring of a wind turbine insulation monitoring method is provided for an embodiment of the present application;

[0056] Fig.10 A wiring diagram for obtaining a generator insulation monitoring protection signal of a wind turbine generator insulation monitoring method is provided for an embodiment of the present application;

[0057] Fig.11 A schematic diagram of the structure of an electronic device is provided for an embodiment of the present application;

[0058] Fig.12 A structural schematic diagram of a wind turbine insulation monitoring device is provided for an embodiment of the present application;

[0059] Reference numerals:

[0060] First acquisition unit-001, second acquisition unit-002, first processing unit-003. DETAILED DESCRIPTION

[0061] 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.

[0062] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0063] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0064] In order to better understand the insulation monitoring method for a wind turbine set provided in an embodiment of the present application, the following first briefly introduces the scenario in which the insulation monitoring method for a wind turbine set is applied. In the scenario of insulation testing of a wind power equipment set, first, if insulation monitoring is performed manually, it is necessary to completely power off the electrical equipment to be tested, that is, the equipment must be shut down first, and then the electrical equipment to be tested must be isolated by a circuit breaker so that it enters a state of no current. However, measuring the insulation performance of the equipment in this way is naturally safe, but its measurement cycle is relatively long, and operations such as shutdown and isolation are required, which affects production efficiency. This embodiment is different from the above-mentioned manual insulation monitoring of wind power equipment sets. Insulation monitoring of wind power equipment sets is performed using an insulation monitoring machine. During remote insulation measurement, the connection status between electrical equipment may be in dynamic change, for example When the generator or related electrical equipment is in a non-shutdown state, or the electrical connection of the equipment is not completely disconnected when insulation measurement is performed, a short circuit may occur due to unexpected electrical connection. Once a short circuit occurs in the generator circuit, the wind turbine equipment may be shut down or even damaged. Specifically, when the main control unit sends a shutdown signal to the generator equipment to test the insulation performance of the unit, the generator begins to reduce the speed and torque when it receives the shutdown signal. However, when the main control shutdown signal is just sent, the generator speed is still very high, and the voltage of the semi-direct drive unit may exceed 2000V, which may damage the monitoring equipment. In addition, the insulation monitoring equipment generally has a resistor inside. When the generator speed is very high, it may break through the equipment and cause a short circuit, burning the winding.

[0065] In order to solve the problem caused by the above scenario, that is, in the prior art, during the remote insulation measurement of electrical equipment, the connection status between the electrical equipment may be in a dynamic change, which may cause unexpected electrical connection and cause short circuit and damage to the wind turbine equipment, this embodiment is preferably, as Figure 1 As shown, a wind turbine insulation monitoring method is proposed, which is applied to an insulation monitoring machine, comprising:

[0066] S1. After receiving the generator winding insulation monitoring command sent by the main control system, obtain the first control information of the converter trunk node and the second control information of the main control trunk node;

[0067] S2, extracting first closing information of the converter trunk node and second closing information of the main control trunk node from the first control information and the second control information respectively;

[0068] S3. If the first closing information indicates that the converter main node is disconnected and the second closing information indicates that the main control main node is disconnected, the control information of the wind turbine generator and the parameter information of the wind turbine generator are obtained. The first closing information of the converter main node and the second closing information of the main control main node are external enabling standards for judging whether insulation can be performed, that is, only when both the converter main node and the main control main node can be disconnected, the requirements of the first protection information are met.

[0069] S4. Determine the insulation monitoring mode according to the control information of the wind turbine generator and the parameter information of the wind turbine generator. It should be noted that the generator speed directly affects the magnitude of the short-circuit current during the insulation measurement. As a preferred solution of this embodiment, the short-circuit current generated by the generator speed and the maximum short-circuit current allowed to pass through the generator winding are compared as the internal enabling standard for judging whether the insulation test can be performed, including:

[0070] S401. Calculate the maximum allowable short-circuit current of the generator winding according to the parameter information of the wind turbine generator. Specifically, Figure 3 As shown, including:

[0071] S4011. Extract winding material, size and insulation grade information from the wind turbine generator parameter information.

[0072] S4012. Calculate the allowable short-circuit current of the generator winding according to the winding material, size and insulation level information. Specifically, the expression for calculating the allowable short-circuit current of the generator winding is as follows:

[0073]

[0074] Among them, I sc is the allowable short-circuit current of the generator winding, ρ is the resistivity of the winding material, L is the length of the winding, A is the cross-sectional area of ​​the winding, Vmax is the maximum voltage of the insulation level, and K is the safety factor.

[0075] S4013. Determine the allowable short-circuit current margin of the generator winding based on the allowable short-circuit current of the generator winding. Since extreme conditions may be encountered during the process of testing the insulation performance, such as the increase in ambient temperature, which may increase the resistance and reduce the current carrying capacity, additional space is provided by determining the margin to cope with these changes.

[0076] S4014. Calculate the maximum allowable short-circuit current of the generator winding according to the allowable short-circuit current margin of the generator winding and the allowable short-circuit current of the generator winding. In this embodiment, the margin is preferably expressed as an additional coefficient α. Therefore, the maximum allowable short-circuit current of the generator winding I max =I sc ×(1+α), where I max is the maximum allowable short-circuit current of the generator winding, I sc is the allowable short-circuit current of the generator winding, and α is the margin factor.

[0077] S402, extracting the wind turbine generator speed from the wind turbine generator control information;

[0078] S403, according to the wind turbine generator speed and wind turbine generator parameter information, calculate the real-time short-circuit current of the generator winding, specifically, Figure 4 As shown, including:

[0079] S4031. Calculate the real-time value of the short-circuit impedance according to the wind turbine generator speed and the wind turbine generator parameter information. Specifically, the real-time value of the short-circuit impedance is as follows:

[0080] Z sc,real =Z sc,base ×(1+k×(NN rated ))

[0081] Among them, Z sc,real is the real-time value of the short-circuit impedance, Z sc,base is the reference short-circuit impedance at rated speed, N rated is the rated speed, N is the current generator speed, and k is the effect of speed change on short-circuit impedance.

[0082] S4032. Extract the rated voltage and rated current of the generator from the wind turbine generator parameter information.

[0083] S4033. Calculate the real-time short-circuit current of the generator winding according to the real-time value of the short-circuit impedance, the rated voltage and the rated current of the generator. Specifically, in this embodiment, the calculation formula of the real-time short-circuit current of the generator winding is preferably as follows:

[0084]

[0085] Among them, I sc,real is the real-time short-circuit current, V rated is the rated voltage of the generator, Z sc,base is the reference short-circuit impedance at rated speed, N rated is the rated speed, N is the current generator speed, and k is the effect of speed change on short-circuit impedance.

[0086] S404: Determine the insulation monitoring mode according to the real-time short-circuit current of the generator winding and the maximum allowable short-circuit current of the generator winding. This embodiment preferably includes the following two steps:

[0087] S4041. If the real-time short-circuit current of the generator winding is less than the maximum allowable short-circuit current of the generator winding, determine that the insulation mode is the formal insulation monitoring mode, and the formal insulation monitoring mode is to directly enter the insulation monitoring of the generator set.

[0088] S4042. If the real-time short-circuit current of the generator winding is greater than the maximum allowable short-circuit current of the generator winding, determine that the insulation mode is the preparatory insulation monitoring mode. The preparatory insulation monitoring mode does not enter the insulation monitoring stage, but is in the preparatory stage, that is, waiting for another insulation instruction, otherwise it will never enter the insulation monitoring stage.

[0089] As a preferred solution of this embodiment, the insulation monitoring mode is a formal insulation monitoring mode. The insulation monitoring of the wind turbine generator is performed according to the insulation monitoring mode, that is, the insulation monitoring is performed using the formal insulation monitoring mode, including:

[0090] S40411. Use the DC injection method to measure the insulation between the generator stator winding and the ground, the rotor winding and the ground, and the stator winding and the rotor winding. In this embodiment, the insulation monitoring machine voltage is DC500V. The wiring diagram of the generator insulation online monitoring is shown in Figure 9 and Fig.10 As shown,

[0091] S40412. Obtaining a preset measurement interval. In this embodiment, preferably, the step of setting the preset measurement interval includes:

[0092] S404121. Extracting real-time temperature information of generator windings from wind turbine generator control information;

[0093] S404122. Determine a preset measurement interval based on the real-time temperature information of the generator winding. Specifically, in this embodiment, preferably, 0.5h-1h is used as the preset measurement interval based on the real-time temperature. Since the insulation resistance of the generator winding is required to be measured in an actual cold state, the ambient medium temperature is taken as the winding temperature in the actual cold state.

[0094] S40413. Repeat the above-mentioned method of measuring the insulation between the stator winding and the ground, the rotor winding and the ground, and the stator winding and the rotor winding of the generator by using the DC injection method according to the preset measurement interval time until an instruction to end the insulation measurement is obtained.

[0095] As a preferred solution of this embodiment, the insulation monitoring mode is a preparatory insulation monitoring mode, and the insulation monitoring of the wind turbine generator according to the insulation monitoring mode includes:

[0096] S404121. Determine the maximum allowable short-circuit current generator speed according to the maximum allowable short-circuit current of the generator. Preferably, in this embodiment, the maximum allowable short-circuit current generator speed can be obtained by reverse calculation according to the allowable short-circuit current step in step S403, as shown below:

[0097]

[0098] Among them, N sc,max is the maximum allowable short-circuit current generator speed, V rated is the rated voltage of the generator, Z sc,base is the reference short-circuit impedance, I sc,max is the maximum short-circuit current allowed by the generator winding, k is the speed influence coefficient, N rated is the rated speed of the generator. Therefore, the maximum allowable short-circuit current generator speed can be calculated through the above calculation formula. In this embodiment, N is preferably sc,max is 80rpm.

[0099] S404122. According to the maximum allowable short-circuit current generator speed, adjust the generator speed to a speed less than the maximum allowable short-circuit current generator speed, and wait to receive the generator winding insulation monitoring command sent by the main control system.

[0100] S5. Perform insulation monitoring on the wind turbine generator according to the insulation monitoring mode. The specific insulation monitoring wiring method is as follows: Fig. 9 and Fig.10 shown.

[0101] That is, this embodiment provides a method for monitoring the insulation of a wind turbine generator set, by obtaining the first control information of the converter trunk node and the second control information of the main control trunk node, closing the information to perform the first protection information judgment, if the conditions for simultaneous disconnection are met, then obtaining the control information of the wind turbine generator set and the parameter information of the wind turbine generator set, so as to perform the second protection information judgment, thereby determining the insulation monitoring mode, and performing insulation monitoring on the generator according to the insulation monitoring mode, through the first protection information judgment and the second protection information judgment, so as to ensure that the insulation monitoring of the generator can be effectively and safely performed, to avoid the circuit causing damage to the electrical equipment due to the operating state of the generator during the insulation test, thereby solving the technical problem in the prior art that in the process of remote insulation measurement of electrical equipment, the connection state between the electrical equipment may be in dynamic change, resulting in accidental electrical connection and short circuit, leading to damage to the wind turbine equipment.

[0102] For the above embodiments, please refer to Fig.11 , Fig.11 An electronic device provided in an embodiment of the present application, i.e., a structural schematic diagram of an insulation monitoring machine, as shown in the figure, includes a processor, an input device, an output device and a memory, the processor, the input device, the output device and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, the processor is configured to call the program instructions, and the program includes instructions for executing the following steps;

[0103] S1. After receiving the generator winding insulation monitoring command sent by the main control system, obtain the first control information of the converter trunk node and the second control information of the main control trunk node;

[0104] S2, extracting first closing information of the converter trunk node and second closing information of the main control trunk node from the first control information and the second control information respectively;

[0105] S3. If the first closing information indicates that the converter trunk node is disconnected and the second closing information indicates that the main control trunk node is disconnected, then acquiring control information of the wind turbine generator and parameter information of the wind turbine generator;

[0106] S4, determining an insulation monitoring mode according to control information of the wind turbine generator and parameter information of the wind turbine generator;

[0107] S5. Perform insulation monitoring on the wind turbine generator according to the insulation monitoring mode.

[0108] In this example, the first control information of the converter trunk node and the second control information of the main control node are obtained, and the closing information is used to perform the first protection information judgment. If the conditions for simultaneous disconnection are met, the control information of the wind turbine generator and the parameter information of the wind turbine generator are obtained to perform the second protection information judgment, thereby determining the insulation monitoring mode, and performing insulation monitoring on the generator according to the insulation monitoring mode. The first protection information judgment and the second protection information judgment are used to ensure that the insulation monitoring of the generator can be carried out effectively and safely, so as to avoid damage to electrical equipment due to the circuit caused by the operating state of the generator during the insulation test.

[0109] The above mainly introduces the scheme of the embodiment of the present application from the perspective of the execution process on the method side. It is understandable that in order to realize the above functions, the terminal includes a hardware structure and / or software module corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments provided herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0110] The embodiment of the present application can divide the terminal into functional units according to the above method example. For example, each functional unit can be divided according to each function, or two or more functions can be integrated into one processing unit. The above integrated unit can be implemented in the form of hardware or in the form of software functional units. It should be noted that the division of units in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0111] In line with the above, see Fig.12 , Fig.12 The present invention provides a schematic diagram of the structure of a wind turbine insulation monitoring device. Fig.12 As shown, the device comprises:

[0112] The first acquisition unit 001 is used to acquire control information of the converter trunk node and the main control trunk node;

[0113] The second acquisition unit 002 is used to acquire the wind turbine generator control information;

[0114] The first processing unit 003 is used to determine the insulation monitoring mode according to the wind turbine generator control information.

[0115] In a possible implementation, the first processing unit 003 is used to:

[0116] According to the wind turbine generator parameter information, the maximum allowable short-circuit current of the generator winding is calculated;

[0117] Extracting the wind turbine generator speed from the wind turbine generator control information;

[0118] Calculate the real-time short-circuit current of the generator winding according to the generator speed and parameter information of the wind turbine generator;

[0119] The insulation monitoring mode is determined according to the real-time short-circuit current of the generator winding and the maximum allowable short-circuit current of the generator winding.

[0120] In a possible implementation, the first processing unit 003 is further configured to:

[0121] Extract winding material, size and insulation grade information from wind turbine generator parameter information;

[0122] Calculate the allowable short-circuit current of the generator winding based on the winding material, size and insulation grade information;

[0123] According to the allowable short-circuit current of the generator winding, determine the allowable short-circuit current margin of the generator winding;

[0124] The maximum allowable short-circuit current of the generator winding is calculated based on the allowable short-circuit current margin of the generator winding and the allowable short-circuit current of the generator winding.

[0125] In a possible implementation, the first processing unit 003 is further configured to:

[0126] Calculate the real-time value of the short-circuit impedance according to the wind turbine generator speed and wind turbine generator parameter information;

[0127] Extract the rated voltage and rated current of the generator from the parameter information of the wind turbine generator;

[0128] The real-time short-circuit current of the generator winding is calculated based on the real-time value of the short-circuit impedance, the rated voltage and the rated current of the generator.

[0129] In a possible implementation, the first processing unit is further configured to:

[0130] According to the real-time short-circuit current of the generator winding and the maximum allowable short-circuit current of the generator winding, the insulation monitoring mode is determined, including:

[0131] If the real-time short-circuit current of the generator winding is less than the maximum allowable short-circuit current of the generator winding, the insulation mode is determined to be the formal insulation monitoring mode;

[0132] If the real-time short-circuit current of the generator winding is greater than the maximum allowable short-circuit current of the generator winding, the insulation mode is determined to be the preparatory insulation monitoring mode.

[0133] An embodiment of the present application also provides a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, and the computer program enables a computer to execute part or all of the steps of any one of the wind turbine insulation monitoring methods recorded in the above method embodiments.

[0134] An embodiment of the present application also provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program enables a computer to execute part or all of the steps of any wind turbine insulation monitoring method recorded in the above method embodiments.

[0135] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0136] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0137] In the several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the device or unit can be electrical or other forms.

[0138] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0139] In addition, the functional units in the various embodiments of the application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware or in the form of software program modules.

[0140] If the integrated unit is implemented in the form of a software program module and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a memory, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned memory includes: U disk, read-only memory (ROM), random access memory (RAM), mobile hard disk, disk or optical disk and other media that can store program codes.

[0141] A person of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a machine-readable memory, which can include: a flash drive, a read-only memory, a random access memory, a magnetic disk or an optical disk, etc.

[0142] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for monitoring insulation of a wind turbine generator set, characterized in that: Applied to an insulation monitoring machine, the method comprises: After receiving the generator winding insulation monitoring command sent by the main control system, first control information of the converter trunk node and second control information of the main control trunk node are obtained; Extracting first closing information of the converter trunk node and second closing information of the main control trunk node from the first control information and the second control information respectively; If the first closing information indicates that the converter trunk node is disconnected and the second closing information indicates that the main control trunk node is disconnected, then acquiring control information of the wind turbine generator and parameter information of the wind turbine generator; Determine the insulation monitoring mode according to the control information of the wind turbine generator and the parameter information of the wind turbine generator; According to the insulation monitoring mode, insulation monitoring is performed on the wind turbine generator.

2. The wind turbine insulation monitoring method according to claim 1, characterized in that: According to the control information of the wind turbine generator and the parameter information of the wind turbine generator, the insulation monitoring mode is determined, including: According to the wind turbine generator parameter information, the maximum allowable short-circuit current of the generator winding is calculated; Extracting the wind turbine generator speed from the wind turbine generator control information; Calculate the real-time short-circuit current of the generator winding according to the generator speed and parameter information of the wind turbine generator; The insulation monitoring mode is determined according to the real-time short-circuit current of the generator winding and the maximum allowable short-circuit current of the generator winding.

3. The wind turbine insulation monitoring method according to claim 2, characterized in that: According to the wind turbine generator parameter information, the maximum allowable short-circuit current of the generator winding is calculated, including: Extract winding material, size and insulation grade information from wind turbine generator parameter information; Calculate the allowable short-circuit current of the generator winding based on the winding material, size and insulation grade information; According to the allowable short-circuit current of the generator winding, determine the allowable short-circuit current margin of the generator winding; The maximum allowable short-circuit current of the generator winding is calculated based on the allowable short-circuit current margin of the generator winding and the allowable short-circuit current of the generator winding.

4. The wind turbine insulation monitoring method according to claim 2 or 3, characterized in that: According to the wind turbine generator speed and wind turbine generator parameter information, the real-time short-circuit current of the generator winding is calculated, including: Calculate the real-time value of the short-circuit impedance according to the wind turbine generator speed and wind turbine generator parameter information; Extract the rated voltage and rated current of the generator from the parameter information of the wind turbine generator; The real-time short-circuit current of the generator winding is calculated based on the real-time value of the short-circuit impedance, the rated voltage and the rated current of the generator.

5. The wind turbine insulation monitoring method according to claim 2, characterized in that: According to the real-time short-circuit current of the generator winding and the maximum allowable short-circuit current of the generator winding, the insulation monitoring mode is determined, including: If the real-time short-circuit current of the generator winding is less than the maximum allowable short-circuit current of the generator winding, the insulation mode is determined to be the formal insulation monitoring mode; If the real-time short-circuit current of the generator winding is greater than the maximum allowable short-circuit current of the generator winding, the insulation mode is determined to be the preparatory insulation monitoring mode.

6. The wind turbine insulation monitoring method according to claim 5, characterized in that: The insulation monitoring mode is a formal insulation monitoring mode. The insulation monitoring of the wind turbine generator is performed according to the insulation monitoring mode, including: The DC injection method is used to measure the insulation between the generator stator winding and the ground, the rotor winding and the ground, and the stator winding and the rotor winding; Get the preset measurement interval time; According to the preset measurement interval time, the above method of using the DC injection method to measure the insulation between the generator stator winding and the ground, the rotor winding and the ground, and the stator winding and the rotor winding is repeatedly executed until the insulation measurement end instruction is obtained.

7. The wind turbine insulation monitoring method according to claim 6, characterized in that: The obtaining of the preset measurement interval time includes: Extract the real-time temperature information of the generator winding from the wind turbine generator control information; The preset measurement interval time is determined according to the real-time temperature information of the generator winding.

8. The wind turbine insulation monitoring method according to claim 5, characterized in that: The insulation monitoring mode is a preparatory insulation monitoring mode. The insulation monitoring of the wind turbine generator is performed according to the insulation monitoring mode, including: According to the maximum allowable short-circuit current of the generator, determine the maximum allowable short-circuit current generator speed; According to the maximum allowable short-circuit current generator speed, adjust the generator speed to less than the maximum allowable short-circuit current generator speed, and wait to receive the generator winding insulation monitoring command sent by the main control system.

9. A wind turbine insulation monitoring device, characterized in that: The device comprises: A first acquisition unit, used to acquire control information of the converter trunk node and the main control trunk node; A second acquisition unit, used to acquire wind turbine generator control information; The first processing unit is used to determine the insulation monitoring mode according to the wind turbine generator control information.

10. An electronic device, characterized in that: It includes a processor, an input device, an output device and a memory, which are interconnected, wherein the memory is used to store a machine program, the machine program includes program instructions, and the processor is configured to call the program instructions to execute the wind turbine insulation monitoring method according to any one of claims 1 to 8.

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