Frequency Converter Design Method, Device, Equipment and Wind Turbine Pitch Reducer Test Bench

Abstract

The present invention provides a frequency converter design method, device, equipment and a test bench for a wind turbine pitch reducer. Among them, the frequency converter design method includes: obtaining wind force data under different wind conditions, load data of a target wind turbine, independent pitch control logic, and mechanical parameters of the gearbox in the target wind turbine; performing load step calculation based on the wind force data, load data of the target wind turbine and independent pitch control logic under different wind conditions to obtain load step results; selecting a target motor based on the load step results and the mechanical parameters of the gearbox, and determining the moment of inertia of the target motor; designing a target frequency converter based on the load step results, the mechanical parameters of the gearbox and the moment of inertia of the target motor to determine the target frequency converter. On the basis of meeting conventional tests, it is ensured that the target frequency converter can work stably for a long time, laying a solid experimental and data foundation for guiding the operation of the wind turbine pitch reducer in the future.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and particularly to a design method, device, equipment and a test bench for a wind turbine pitch reducer of a frequency converter. Background Art

[0002] As the wind turbine rotor diameter is getting larger and larger, the use of independent pitch can effectively reduce the impact of unbalanced loads caused by wind shear, turbulence, yaw error, etc. on the key components of the whole machine, thereby improving the reliability of the components and extending the service life of the components. Independent pitch has a great impact on the fatigue life of the pitch reducer. Therefore, it is necessary to conduct test verification in the sub-component development stage. However, due to the long time required for fatigue life testing, general frequency converters (such as IGBTs) cannot support the completion of the test for a long time, which easily leads to inaccurate test results of the wind turbine pitch reducer, or even unable to obtain test results. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the test requirements cannot be met, so as to provide a design method, device, equipment and a test bench for a wind turbine pitch reducer of a frequency converter that can support long-term testing.

[0004] According to a first aspect, an embodiment of the present invention provides a design method for a frequency converter, where the frequency converter is used for testing a wind turbine pitch reducer, and the wind turbine includes an independent pitch structure. The method includes:

[0005] Obtain wind power data, load data of a target wind turbine, independent pitch control logic, and mechanical parameters of an internal gearbox of the target wind turbine under different wind conditions;

[0006] Based on the wind power data, the load data of the target wind turbine, and the independent pitch control logic under different wind conditions, perform load step calculation to obtain a load step result;

[0007] Based on the load step result and the mechanical parameters of the gearbox, select a target motor and determine the moment of inertia of the target motor;

[0008] Based on the load step result, the mechanical parameters of the gearbox, and the moment of inertia of the target motor, design a target frequency converter to determine the target frequency converter.

[0009] Optionally, the independent pitch control logic is constructed in the following manner:

[0010] Obtain current wind power data;

[0011] Based on the current wind power data, calculate the blade rotation angle of the target wind turbine;

[0012] Construct the independent pitch control logic based on the current wind power data and the blade rotation angle.

[0013] Optionally, performing a load step calculation based on the wind power data under different wind conditions, the load data of the target wind turbine, and the independent pitch control logic to obtain a load step result, including:

[0014] Conduct a wind turbine load test based on the wind power data under different wind conditions, the load data of the target wind turbine, and the independent pitch control logic;

[0015] Based on the change in the test load, count the number of reversals of the independent pitch structure in the target wind turbine and calculate the loading speed of the gearbox;

[0016] Based on the number of reversals of the independent pitch structure and the loading speed of the gearbox, disassemble the test load and divide the test stages, where the test stages include a forward speed-up stage, a load stabilization stage, a rapid reversal loading stage, and a cyclic running-in stage;

[0017] Optimize the load step based on the test stages to obtain an optimized load step result.

[0018] Optionally, the counting the number of reversals of the independent pitch structure in the target wind turbine and calculating the loading speed of the gearbox based on the change in the test load includes:

[0019] Obtain the backlash between the gearbox and the gear ring in the target wind turbine;

[0020] Determine whether the backlash is greater than a preset threshold;

[0021] When the backlash is greater than the preset threshold, extract the pitch angle based on the backlash;

[0022] Divide multiple load intervals based on the pitch angle;

[0023] Based on the change in the test load, count the number of reversals of the independent pitch structure and the ultimate pitch speed in each load interval;

[0024] Calculate the loading speed based on the ultimate pitch speed.

[0025] Optionally, the mechanical parameters of the gearbox include the gearbox moment of inertia, and the selecting a target motor based on the load step result and the mechanical parameters of the gearbox includes:

[0026] Based on the load step result and the gearbox moment of inertia, determine the ultimate torque, maximum speed, and ultimate acceleration of the gearbox;

[0027] Calculate the maximum instantaneous power based on the rotational inertia of the gearbox and the limit acceleration;

[0028] Compare the limit torque with the peak torque corresponding to the maximum instantaneous power, and determine the larger value of the two as the maximum torque requirement of the target motor;

[0029] Select the target motor based on the maximum torque requirement and the maximum speed.

[0030] Optionally, the mechanical parameter of the gearbox is the rotational inertia of the gearbox. Design the target frequency converter based on the load step result, the mechanical parameter of the gearbox, and the rotational inertia of the target motor to determine the target frequency converter, including:

[0031] Based on the load step result, calculate the mechanical kinetic energy of the gearbox under the instantaneous working condition and extract the maximum loading speed in the load step result;

[0032] Perform efficiency loss calculation based on the mechanical kinetic energy to obtain the power requirement of the gearbox;

[0033] Based on the power requirement, calculate the energy storage requirement of the mechanical transmission chain at the current moment;

[0034] Based on the rotational inertia of the target motor, the rotational inertia of the gearbox, and the maximum loading speed, calculate the target capacity of the target frequency converter;

[0035] Based on the load step result, calculate the efficiency losses of the mechanical transmission chain and the electrical transmission chain under the steady-state working condition;

[0036] Based on the efficiency losses of the mechanical transmission chain and the electrical transmission chain and the energy storage requirement of the mechanical transmission chain, calculate the rectification capacity of the target frequency converter;

[0037] Design the target frequency converter based on the target capacity and the rectification capacity to determine the target frequency converter.

[0038] According to the second aspect, an embodiment of the present invention provides a frequency converter design device. The frequency converter is used for the test of the wind turbine pitch reducer, and the wind turbine includes an independent pitch structure. The device includes:

[0039] An acquisition module, configured to acquire wind force data under different wind conditions, load data of the target wind turbine, independent pitch control logic, and mechanical parameters of the gearbox in the target wind turbine;

[0040] A first processing module, configured to perform load step calculation based on the wind force data under different wind conditions, the load data of the target wind turbine, and the independent pitch control logic to obtain a load step result;

[0041] A second processing module, configured to select a target motor based on the load step result and the mechanical parameters of the gearbox, and determine the moment of inertia of the target motor;

[0042] A third processing module, configured to design a target frequency converter based on the load step result, the mechanical parameters of the gearbox, and the moment of inertia of the target motor, and determine the target frequency converter.

[0043] According to a third aspect, an embodiment of the present invention provides a frequency converter design device, including: a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the method described in the first aspect or any optional implementation manner of the first aspect.

[0044] According to a fourth aspect, an embodiment of the present invention provides a wind turbine pitch reducer test bench, including: a frequency converter, which is designed and determined by the method described in the first aspect or any optional implementation manner of the first aspect.

[0045] According to a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores computer instructions for causing a computer to execute the method described in the first aspect or any optional implementation manner of the first aspect.

[0046] The technical solution of the present invention has the following advantages:

[0047] The frequency converter design method, device, equipment, and wind turbine pitch reducer test bench provided by the present invention obtain wind force data under different wind conditions, load data of the target wind turbine, independent pitch control logic, and mechanical parameters of the gearbox in the target wind turbine; perform load step calculation based on the wind force data under different wind conditions, the load data of the target wind turbine, and the independent pitch control logic to obtain a load step result; select a target motor based on the load step result and the mechanical parameters of the gearbox, and determine the moment of inertia of the target motor; design a target frequency converter based on the load step result, the mechanical parameters of the gearbox, and the moment of inertia of the target motor, and determine the target frequency converter. By performing load step calculation to obtain a load step result and selecting a target motor according to the load step result and the mechanical parameters of the gearbox, it is ensured that the motor can meet the test requirements. On this basis, the target frequency converter is designed and determined, so as to ensure that the target frequency converter can work stably for a long time on the basis of meeting conventional tests, and then the test results of the wind turbine pitch reducer can be accurately obtained, laying a solid experimental and data foundation for guiding the operation of the wind turbine pitch reducer in the future. Description of the Drawings

[0048] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0049] Figure 1 Flowchart of the frequency converter design method according to an embodiment of the present invention;

[0050] Figure 2 Schematic diagram of the test stage division according to an embodiment of the present invention;

[0051] Figure 3 Schematic diagram of the structure of the frequency converter design device according to an embodiment of the present invention;

[0052] Figure 4 Schematic diagram of the structure of the frequency converter according to an embodiment of the present invention;

[0053] Figure 5 Schematic diagram of the connection of the frequency converter according to an embodiment of the present invention. Specific embodiments

[0054] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0055] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can also be the communication inside two components. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0058] In practical applications, during the development stage of the pitch reducer based on independent pitch, it is necessary to test the reliability of the gearbox based on its existing performance, especially to verify the working process of independent pitch under frequent pitch-changing conditions, so as to complete the fatigue life test of the pitch reducer. A relatively complete set of reliability tests (airtightness test, no-load test, efficiency test, ultimate load test, high-acceleration life test) lays the theoretical and data foundation for subsequent component development. In the prior art, since the frequency converter generally consists of a diode and an inverter, a large amount of heat will be generated under frequent pitch-changing conditions, resulting in the inability to work stably for a long time, and then easily leading to inaccurate test results of the wind turbine pitch reducer, or even the situation where test results cannot be obtained.

[0059] Based on the above problems, an embodiment of the present invention provides a frequency converter design method. The frequency converter is used for testing the wind turbine pitch reducer, and the wind turbine includes an independent pitch structure, as Figure 1 shown. The specific steps of this frequency converter design method are as follows:

[0060] Step S101: Obtain wind force data under different wind conditions, load data of the target wind turbine, independent pitch control logic, and mechanical parameters of the gearbox in the target wind turbine.

[0061] Specifically, in practical applications, the mechanical parameters of the gearbox include rotational speed, torque, and parameters corresponding to the mechanical interface.

[0062] Step S102: Based on the wind force data under different wind conditions, the load data of the target wind turbine, and the independent pitch control logic, perform load step calculation to obtain load step results.

[0063] Specifically, in practical applications, the embodiment of the present invention calculates the load step by performing control simulation, providing technical data support for subsequent disassembly and optimization of the test load step and the design of the target frequency converter.

[0064] Step S103: Select a target motor based on the load step result and the mechanical parameters of the gearbox, and determine the moment of inertia of the target motor.

[0065] Specifically, in practical applications, there may be two target motors in the embodiments of the present invention. One is used as a driving motor, and the other is used as a generator to store a large amount of kinetic energy generated under frequent pitch-changing conditions, so as to ensure that the target frequency converter will not generate a large amount of heat due to long-term operation, and thus prevent the occurrence of target frequency converter failures.

[0066] Step S104: Design the target frequency converter based on the load step result, the mechanical parameters of the gearbox, and the moment of inertia of the target motor, and determine the target frequency converter.

[0067] By performing the above steps, the frequency converter design method provided by the embodiments of the present invention obtains the load step result through load step calculation, selects the target motor according to the load step result and the mechanical parameters of the gearbox to ensure that the motor can meet the test requirements. On this basis, the target frequency converter is designed and determined, so as to ensure that the target frequency converter can operate stably for a long time on the basis of meeting the conventional test, and thus accurately obtain the test results of the wind turbine pitch reducer, laying a solid experimental and data foundation for guiding the operation of the wind turbine pitch reducer in the future.

[0068] Specifically, in one embodiment, the construction of the above independent pitch control logic specifically includes the following steps:

[0069] Step S201: Obtain the current wind data.

[0070] Step S202: Calculate the blade rotation angle of the target wind turbine based on the current wind data.

[0071] Step S203: Construct the independent pitch control logic based on the current wind data and the blade rotation angle.

[0072] Specifically, in practical applications, the embodiments of the present invention will determine the blade rotation angle according to the wind force, and establish a corresponding relationship according to the wind force and the blade rotation angle, providing the necessary test logic for subsequent design of the target frequency converter based on the independent pitch control logic and related tests on the wind turbine pitch reducer test bench, while ensuring the accuracy of the test results and further improving the test efficiency.

[0073] Specifically, in one embodiment, the above step S102 performs load step calculation based on the wind force data under different wind conditions, the load data of the target wind turbine, and the independent pitch control logic to obtain the load step result, which specifically includes the following steps:

[0074] Step S301: Conduct a fan load test based on the wind force data under different wind conditions, the load data of the target fan, and the independent pitch control logic.

[0075] Step S302: Based on the change of the test load, count the number of reversals of the independent pitch structure in the target fan and calculate the loading speed of the gearbox.

[0076] Specifically, in practical applications, the embodiment of the present invention can calculate the loading speed of the gearbox according to the angle change value of each pitch angle and the time corresponding to the angle change value. Exemplarily, the pitch angle can change from 0° to 6°, but this is not limited to the actual situation, and the starting angle is not necessarily 0°.

[0077] Specifically, in practical applications, the embodiment of the present invention identifies the true displacement-torque conditions actually occurring in the wind farm by performing equivalent load step design, so as to verify the damage of the gearbox caused by gear micro-movement, bearing micro-movement or small-angle micro-movement of other gearbox components.

[0078] Step S303: Based on the number of reversals of the independent pitch structure and the loading speed of the gearbox, disassemble the test load and divide the test stage, and the test stage includes a forward speed-up stage, a load stabilization stage, a rapid commutation loading stage, and a cyclic running-in stage.

[0079] Step S304: Optimize the load step based on the test stage to obtain the optimized load step result.

[0080] Specifically, in practical applications, since the test process cannot fully simulate the change process of the blade moment of inertia and the friction torque, it is necessary to optimize the load step to ensure the smooth progress of the test process. The specific processing process is as follows:

[0081] The test process is divided into three steps. Among them, the first step is to first increase the speed to make the gearbox drive chain stable at a low speed (for example, 300Rpm), then apply it to the forward rated torque, and then increase the speed of the gearbox drive chain to the rated speed at the fastest loading speed analyzed; the second step is to make the gearbox drive chain run stably for x seconds to establish a steady-state contact on the tooth surface; the third step is to drag the motor to release the torque. At this time, the generator will be forced to brake to quickly reduce the speed of the gearbox drive chain to 0, and then the generator is used as the target motor to apply the reverse speed in the reverse direction, making the gearbox drive chain run empty to a low speed and then stabilize, apply the reverse rated torque, and then quickly load to the rated speed at the analyzed reverse loading speed; repeat this load step to optimize the load step, so that the test stage is optimized from a rapid load increase stage, a short-time steady-state loading stage, and a commutation rapid loading stage to the Figure 2 shown forward speed-up stage, load stabilization stage, rapid commutation loading stage, and cyclic running-in stage of 4 stages.

[0082] Specifically, in practical applications, such as Figure 2 shown, to better divide each test stage, considering that the positive load has a higher influence contribution in the fatigue life test, and the positive direction is mostly the loading process while the negative direction is the unloading process. Therefore, in the embodiments of the present invention, each test stage is divided taking the loading process as an example. In practical applications, the rapid loading process can be regarded as an impact condition. Therefore, in the embodiments of the present invention, each test stage will be divided based on the limit data, and the limit data includes the maximum pitch acceleration determined according to the loading speed.

[0083] Specifically, in one embodiment, the above step S302 specifically includes the following steps:

[0084] Step S401: Obtain the backlash between the gearbox and the gear ring in the target wind turbine.

[0085] Step S402: Determine whether the backlash is greater than a preset threshold.

[0086] Step S403: When the backlash is greater than the preset threshold, extract the pitch angle based on the backlash.

[0087] Step S404: Divide multiple load intervals based on the pitch angle.

[0088] Step S405: Based on the change of the test load, count the commutation times and the limit pitch speed of the independent pitch structure in each load interval.

[0089] Step S406: Calculate the loading speed based on the limit pitch speed.

[0090] Specifically, in practical applications, the preset threshold can also be called the minimum pitch angle, and the backlash is the backlash between the gear ring and the output shaft of the gearbox, that is, the internal backlash of the gearbox. By setting the preset threshold, when the backlash is less than the preset threshold, it means that when the impeller rotates by a certain angle, the motor of the high-speed shaft of the gearbox will not be loaded, thereby filtering out false displacement statistics and further improving the test efficiency.

[0091] Specifically, in one embodiment, the mechanical parameters of the gearbox include the gearbox moment of inertia (also known as the mechanical transmission chain moment of inertia, which is the same as the following mechanical transmission chain moment of inertia). The above step S103 selects the target motor based on the load step result and the mechanical parameters of the gearbox, and specifically includes the following steps:

[0092] Step S501: Based on the load step result and the gearbox moment of inertia, determine the limit torque, maximum speed, and limit acceleration of the gearbox.

[0093] Step S502: Calculate the maximum instantaneous power based on the rotational inertia of the gearbox and the limit acceleration.

[0094] Step S503: Compare the limit torque and the peak torque corresponding to the maximum instantaneous power, and determine the maximum torque requirement of the target motor as the larger value of the two.

[0095] Step S504: Select the target motor based on the maximum torque requirement and the maximum speed.

[0096] Specifically, in one embodiment, the above step S104 designs the target frequency converter based on the load step result, the mechanical parameters of the gearbox, and the rotational inertia of the target motor, and determines the target frequency converter, which specifically includes the following steps:

[0097] Step S601: Calculate the mechanical kinetic energy of the gearbox under the instantaneous working condition based on the load step result, and extract the maximum loading speed in the load step result.

[0098] Step S602: Calculate the efficiency loss based on the mechanical kinetic energy to obtain the power requirement of the gearbox.

[0099] Step S603: Calculate the energy storage requirement of the mechanical transmission chain at the current moment based on the power requirement.

[0100] Step S604: Calculate the target capacity of the target frequency converter based on the rotational inertia of the target motor, the rotational inertia of the gearbox, and the maximum loading speed.

[0101] Step S605: Calculate the efficiency losses of the mechanical transmission chain and the electrical transmission chain under the steady working condition based on the load step result.

[0102] Step S606: Calculate the rectification capacity of the target frequency converter based on the efficiency losses of the mechanical transmission chain and the electrical transmission chain and the energy storage requirement of the mechanical transmission chain.

[0103] Step S607: Design the target frequency converter based on the target capacity and the rectification capacity to determine the target frequency converter.

[0104] Specifically, in practical applications, the results of each efficiency loss can be calculated with reference to the relevant descriptions in the prior art, and will not be elaborated here.

[0105] In the embodiments of the present invention, the pitch action of the blade is statistically analyzed based on the simulated timing load step, and the test load step is disassembled and optimized; based on the torque peak calculated from the load step, the target motor is selected and matched, and based on the optimized load step and the overall moment of inertia of the mechanical transmission chain, the inverter power and rectifier capacity of the target frequency converter are designed. On this basis, the electrical transmission chain of the wind turbine pitch reducer test bench is designed, and then the construction of the wind turbine pitch reducer test bench is completed. By considering the energy storage requirements during the rapid loading and braking processes, the embodiments of the present invention design the target frequency converter, and then complete the construction process of the wind turbine pitch reducer, laying a solid experimental foundation for the subsequent long-term reliability test of the gearbox.

[0106] By performing the above steps, the frequency converter design method provided by the embodiments of the present invention obtains the load step result through load step calculation, selects and matches the target motor according to the load step result and the mechanical parameters of the gearbox, ensures that the motor can meet the test requirements. On this basis, the target frequency converter is designed and determined, so as to ensure that the target frequency converter can work stably for a long time on the basis of meeting the conventional test, and then the test result of the wind turbine pitch reducer can be accurately obtained, laying a solid experimental and data foundation for guiding the operation of the wind turbine pitch reducer in the future.

[0107] The embodiments of the present invention provide a frequency converter design device. The frequency converter is used for the test of the wind turbine pitch reducer, and the wind turbine includes an independent pitch structure, as Figure 3 shown. This frequency converter design device includes:

[0108] An acquisition module 101, configured to acquire wind force data under different wind conditions, load data of the target wind turbine, independent pitch control logic, and mechanical parameters of the gearbox in the target wind turbine. For detailed content, refer to the relevant description of step S101 in the above method embodiments, and details will not be repeated here.

[0109] A first processing module 102, configured to perform load step calculation based on the wind force data under different wind conditions, the load data of the target wind turbine, and the independent pitch control logic to obtain a load step result. For detailed content, refer to the relevant description of step S102 in the above method embodiments, and details will not be repeated here.

[0110] A second processing module 103, configured to select and match a target motor based on the load step result and the mechanical parameters of the gearbox, and determine the moment of inertia of the target motor. For detailed content, refer to the relevant description of step S103 in the above method embodiments, and details will not be repeated here.

[0111] The third processing module 104 is configured to design a target frequency converter based on the load step result, the mechanical parameters of the gearbox, and the moment of inertia of the target motor, and determine the target frequency converter. For the detailed content, refer to the relevant description of step S104 in the above method embodiment, which will not be elaborated here.

[0112] For a further description of the above frequency converter design device, refer to the relevant description of the above frequency converter design method embodiment, which will not be elaborated here.

[0113] Through the collaborative cooperation of the above-mentioned components, the frequency converter design device provided by the embodiment of the present invention obtains the load step result by performing load step calculation, selects the target motor according to the load step result and the mechanical parameters of the gearbox, ensures that the motor can meet the test requirements, and on this basis, designs and determines the target frequency converter, so as to ensure that the target frequency converter can work stably for a long time on the basis of meeting the conventional test, and further accurately obtain the test result of the fan pitch reducer, laying a solid experimental and data foundation for guiding the operation of the fan pitch reducer in the future.

[0114] The embodiment of the present invention provides a frequency converter design device, including a processor 901 and a memory 902, which are communicatively connected to each other. The processor 901 and the memory 902 can be connected by a bus or other means. Figure 4 Taking the connection by bus as an example.

[0115] The processor 901 can be a central processing unit (CPU). The processor 901 can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. chips, or a combination of the above various chips.

[0116] The memory 902, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the method in the embodiment of the present invention. The processor 901 executes various functional applications and data processing of the processor 901 by running the non-transitory software programs, instructions, and modules stored in the memory 902, that is, implements the method in the above method embodiment.

[0117] The memory 902 may include a program storage area and a data storage area. The program storage area may store an operating system and application programs required for at least one function. The data storage area may store data created by the processor 901 and the like. In addition, the memory 902 may include a high-speed random access memory and may also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory 902 may optionally include a memory remotely disposed relative to the processor 901, and these remote memories may be connected to the processor 901 through a network. Examples of the above networks include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0118] One or more modules are stored in the memory 902 and, when executed by the processor 901, perform the methods in the above method embodiments.

[0119] For the specific details of the above frequency converter design device, reference may be made to the corresponding relevant descriptions and effects in the above method embodiments for understanding, and details are not described herein again.

[0120] An embodiment of the present invention provides a fan pitch reducer test bench. The fan pitch reducer test bench includes a frequency converter 10, and the frequency converter 10 is designed and determined by the method in the above method embodiment.

[0121] Specifically, in practical applications, the fan pitch reducer test bench constructed in the embodiment of the present invention further includes a control system (not shown in the figure). The control system can be used to simulate the fan operating environment, identify the differences between the fan pitch reducer test bench and the actual operating environment of the fan blades, and perform corresponding simulation tests based on the differences.

[0122] Specifically, in practical applications, the above frequency converter design device is used to design and determine the frequency converter 10 in the embodiment of the present invention, and a fan pitch reducer test bench is constructed based on the determined frequency converter 10.

[0123] Specifically, in practical applications, the fan pitch reducer test bench includes a frequency converter 10, as Figure 5 shown. The frequency converter 10 includes a rectifier 1, inverters (i.e., inverter 2 and inverter 3), and a DC bus 6. The rectifier 1 is adapted to convert alternating current into direct current. Exemplarily, the rectifier 1 may be a four-quadrant rectifier, so as to ensure that current can flow in and out. The DC bus 6 is adapted to return power, so as to return the excess power generated by the fan pitch reducer test bench to the high-voltage bus 7 and then back to the national power grid, further reducing the energy consumption of the test bench while ensuring stable and efficient testing.

[0124] Specifically, in practical applications, the fan pitch reducer test bench constructed in the embodiments of the present invention further includes two motors (i.e., the first motor M1 and the second motor M2). The frequency converter 10 provided in the embodiments of the present invention includes two inverters (i.e., the inverter 2 and the inverter 3), which are adapted to convert direct current into alternating current. One is adapted to drive the first motor M1 to supply power to the first motor M1; the other is used as feedback to return the electric energy generated by the second motor M2 to the DC bus 6, so as to perform power internal circulation. Among them, the second motor M2 can be a generator.

[0125] Specifically, in practical applications, the first motor M1 is connected to the first gearbox G1 through the first torque meter 4, and the second motor M2 is connected to the second gearbox G2 through the second torque meter 5.

[0126] Those skilled in the art can understand that to implement all or part of the processes in the above method embodiments, it can be completed by instructing relevant hardware through a computer program. The implemented program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. Among them, the storage medium can be a magnetic disk, an optical disc, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (abbreviation: HDD), or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above types of memories.

[0127] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A frequency converter design method, characterized in that The frequency converter is used for the test of the fan pitch reducer. The fan includes an independent pitch structure. The method includes: Obtaining wind force data under different wind conditions, load data of the target fan, independent pitch control logic, and mechanical parameters of the gearbox in the target fan; Conducting a fan load test based on the wind force data under different wind conditions, the load data of the target fan, and the independent pitch control logic; Based on the change of the test load, counting the number of reversals of the independent pitch structure in the target fan and calculating the loading speed of the gearbox; Based on the number of reversals of the independent pitch structure and the loading speed of the gearbox, disassembling the test load, dividing the test phases, and the test phases include a forward speed-up phase, a load stabilization phase, a rapid commutation loading phase, and a cyclic running-in phase; Conducting load step optimization based on the test phases to obtain an optimized load step result; Selecting a target motor based on the load step result and the mechanical parameters of the gearbox, and determining the moment of inertia of the target motor; Designing a target frequency converter based on the load step result, the mechanical parameters of the gearbox, and the moment of inertia of the target motor to determine the target frequency converter.

2. The method according to claim 1, wherein The independent pitch control logic is constructed in the following manner: Obtaining the current wind force data; Calculating the blade rotation angle of the target fan based on the current wind force data; Constructing the independent pitch control logic based on the current wind force data and the blade rotation angle.

3. The method according to claim 1, wherein The counting the number of reversals of the independent pitch structure in the target fan and calculating the loading speed of the gearbox based on the change of the test load includes: Obtaining the backlash between the gearbox and the gear ring in the target fan; Judging whether the backlash is greater than a preset threshold; When the backlash is greater than the preset threshold, extracting the pitch angle based on the backlash; Dividing multiple load intervals based on the pitch angle; Counting the number of reversals of the independent pitch structure and the ultimate pitch speed in each load interval based on the change of the test load; Calculating the loading speed based on the ultimate pitch speed.

4. The method according to claim 1, wherein The mechanical parameters of the gearbox include the gearbox moment of inertia. The selecting a target motor based on the load step result and the mechanical parameters of the gearbox includes: Determining the ultimate torque, maximum speed, and ultimate acceleration of the gearbox based on the load step result and the gearbox moment of inertia; Calculating the maximum instantaneous power based on the gearbox moment of inertia and the ultimate acceleration; Comparing the ultimate torque and the peak torque corresponding to the maximum instantaneous power, and determining the larger value of the two as the maximum torque requirement of the target motor; Selecting the target motor based on the maximum torque requirement and the maximum speed.

5. The method according to claim 1, wherein The mechanical parameter of the gearbox is the gearbox moment of inertia. The designing a target frequency converter based on the load step result, the mechanical parameters of the gearbox, and the moment of inertia of the target motor to determine the target frequency converter includes: Calculating the mechanical kinetic energy of the gearbox under instantaneous working conditions based on the load step result and extracting the maximum loading speed in the load step result; Based on the mechanical kinetic energy, calculate the efficiency loss to obtain the power demand of the gearbox; Based on the power demand, calculate the energy storage demand of the mechanical transmission chain at the current moment; Based on the moment of inertia of the target motor, the moment of inertia of the gearbox, and the maximum loading speed, calculate the target capacity of the target frequency converter; Based on the load step result, calculate the efficiency loss of the mechanical transmission chain and the electrical transmission chain under steady-state conditions; Based on the efficiency loss of the mechanical transmission chain and the electrical transmission chain and the energy storage demand of the mechanical transmission chain, calculate the rectifier capacity of the target frequency converter; Based on the target capacity and the rectifier capacity, design the target frequency converter to determine the target frequency converter.

6. A frequency converter design device, characterized in that, The frequency converter is used for the test of the wind turbine pitch reducer. The wind turbine includes an independent pitch structure. The device includes: An acquisition module, configured to acquire wind power data, load data of the target wind turbine, independent pitch control logic, and mechanical parameters of the gearbox in the target wind turbine under different wind conditions; A first processing module, configured to perform a wind turbine load test based on the wind power data, the load data of the target wind turbine, and the independent pitch control logic under different wind conditions; based on the change of the test load, count the commutation times of the independent pitch structure in the target wind turbine and calculate the loading speed of the gearbox; based on the commutation times of the independent pitch structure and the loading speed of the gearbox, disassemble the test load and divide the test stages, where the test stages include a forward speed-up stage, a load stabilization stage, a rapid commutation loading stage, and a cyclic running-in stage; perform load step optimization based on the test stages to obtain an optimized load step result; A second processing module, configured to select a target motor based on the load step result and the mechanical parameters of the gearbox, and determine the moment of inertia of the target motor; A third processing module, configured to design a target frequency converter based on the load step result, the mechanical parameters of the gearbox, and the moment of inertia of the target motor to determine the target frequency converter.

7. A frequency converter design device, characterized in that, Comprising: A memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the method according to any one of claims 1-5.

8. A test bench for a variable pitch speed reducer of a fan, characterized in that, Comprising: A frequency converter, which is designed and determined by the method according to any one of claims 1-5.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions, and the computer instructions are used to cause a computer to execute the method according to any one of claims 1-5.

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