A wind turbine subcomponent testing and evaluation system and control method

Abstract

The present application belongs to the technical field of wind turbine testing, and discloses a wind turbine subcomponent testing and evaluation system and a control method. The system comprises a comprehensive converter, a six-degree-of-freedom loading subsystem, a wind turbine and a power grid simulator. The wind turbine comprises a gearbox, a generator and a wind power converter. The six-degree-of-freedom loading subsystem, the gearbox and the generator are connected in sequence. The output end of the generator is connected to the wind power converter. The comprehensive converter is connected to a drag motor through a first switch and connected to the wind power converter through a second switch. The comprehensive converter is used to control the drag motor or simulate the generator. The output end of the wind power converter is connected to the power grid simulator. The power grid simulator is used to receive the power signal output by the wind power converter to simulate the power grid working condition. The present application has the functions of transmission chain testing and independent converter testing, can flexibly switch the operation mode according to the testing requirements, reduces the transmission chain wear and energy loss, reduces the testing cost, and widens the testing scene.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine testing technology, and specifically relates to a wind turbine sub-component testing and evaluation system and control method. Background Technology

[0002] With the large-scale integration of wind turbines into the power grid, the proportion of synchronous power sources in the system is gradually decreasing, leading to low system immunity and weak inertia, posing serious challenges to safe operation. Mastering and improving the grid-connected performance of wind turbines is crucial for enhancing the safe operation of the power grid. How to efficiently and comprehensively conduct tests and verifications on various components of wind turbines is currently a research focus. Among these, drivetrain test platforms and converter test platforms based on wind turbines allow for selective testing of sub-components, and these two platforms have received considerable attention both domestically and internationally.

[0003] Wind turbine drivetrain test platforms and converter test platforms are developed for different application scenarios. The former focuses on testing the mechanical load characteristics of the drivetrain, while the latter focuses on testing the electrical characteristics of the wind turbine converter but cannot test mechanical components. Although the former can also test the electrical characteristics of the wind turbine converter, it relies on the dragging of mechanical components, increasing mechanical wear and energy loss, and resulting in higher testing costs. In particular, when testing wind turbines using a drivetrain test platform, the interaction between the drivetrain and the wind turbine converter means that a problem in either will affect the overall operation, and it is sometimes difficult to identify which component is causing the problem. Currently, scholars have studied the topology and control of these two platforms, but a test system structure integrating the functions of both platforms has not been considered, nor have specific control methods been provided.

[0004] Chinese patent application CN202110629905.5 discloses a full-scale ground loading test system for wind turbine drivetrain and its control method. The system consists of a virtual component and hardware. The virtual component is used to simulate the six-degree-of-freedom load vector of the wind turbine rotor using the wind speed at the test prototype, the velocity distribution of water flow generated by waves and ocean currents in the direction perpendicular to the underwater components of the test prototype's support structure, and the operating parameters of the hardware. The hardware is used to perform ground testing of the wind turbine drivetrain based on the six-degree-of-freedom load vector. When controlling the system, the wind speed, velocity distribution, and operating parameters are input into the virtual component to obtain its output six-degree-of-freedom aerodynamic load. The hardware uses the six-degree-of-freedom aerodynamic load to perform equivalent six-degree-of-freedom load loading on the wind turbine drivetrain and tests whether the performance of the test prototype meets the control target. This patent application focuses on the six-degree-of-freedom load equivalent loading control method of the wind turbine drive train, and does not involve the control method of driving the converter. On the other hand, the test system can only drive the drive train through mechanical components to achieve the test of various components of the wind turbine, such as the converter. However, in scenarios where only the converter needs to be tested, the system operation is cumbersome and lacks flexibility.

[0005] Chinese Patent Publication No. CN218240235U discloses a test platform for a doubly-fed induction generator (DFIG) converter for offshore wind power. This test platform includes a grid-connected cabinet test section for testing the temperature rise of the copper busbars in the DFIG converter grid-connected cabinet, and a power cabinet test section for testing the temperature rise of internal components or the electrical stress of power devices in the DFIG converter power cabinet. The grid-connected cabinet test section includes a second switch, a grid simulation device, a first transformer T1, and the grid-connected cabinet under test, connected in sequence. The power cabinet test section includes a voltage output circuit that provides multiple voltage levels, a sixth transformer connected to the voltage output circuit, a third transformer T3 and its soft-start circuit, at least one reactive power compensation device, and the power cabinet under test. This platform eliminates the need for a motor and can be used for temperature rise testing of DFIG converters and electrical stress testing of converter power devices. However, this platform is mainly used for testing and verifying the components within the converter and cannot be used for verifying the converter's control functions or its ability to adapt to complex power grids. Summary of the Invention

[0006] The purpose of this invention is to provide a testing and evaluation system and control method for wind turbine sub-components, so as to solve the technical problems of existing testing systems being cumbersome to operate and lacking flexibility.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a wind turbine sub-component testing and evaluation system, including: an integrated converter, a six-degree-of-freedom loading subsystem, a wind turbine, and a power grid simulator;

[0009] The six-degree-of-freedom loading subsystem includes a drive motor and a non-torque loading device; the wind turbine includes a gearbox, a generator, and a wind power converter; the drive motor, the non-torque loading device, the gearbox, and the generator are connected in sequence; the output of the generator is connected to the wind power converter;

[0010] The integrated converter is connected to the drive motor via a first switch and to the wind power converter via a second switch; the integrated converter is used to control the drive motor or simulate a generator.

[0011] The output of the wind power converter is connected to a power grid simulator; the power grid simulator is used to receive the electrical energy output by the wind power converter and simulate the power grid operating conditions.

[0012] A further improvement of the present invention is that: the power grid simulator and the integrated converter are both back-to-back converters; the power grid operating conditions include voltage faults and disturbances, frequency disturbances, and harmonic generation.

[0013] A further improvement of the present invention is that the integrated converter is connected to the wind power converter through a second switch and a transformer.

[0014] A further improvement of the present invention is that the output terminal of the generator is connected to the input terminal of the wind power converter via a third switch.

[0015] A further improvement of the present invention is that the output terminal of the wind power converter is also connected to a controllable load via a fourth switch.

[0016] A further improvement of the present invention is that it also includes an AC power grid; the AC power grid connects the integrated converter and the power grid simulator.

[0017] A further improvement of this invention is that: the first switch is in a closed state, the second switch is in an open state, and the wind turbine sub-component testing and evaluation system is in a wind turbine drivetrain testing mode; in the wind turbine drivetrain testing mode:

[0018] The upper-level controller, based on real-time simulation and torque decoupling algorithm, decomposes the operating environment of the wind turbine into one speed signal and five non-torsional torque signals. The speed signal is sent to the integrated converter, and the five non-torsional torque signals are sent to the non-torsional loading device. The integrated converter controls the drive motor to run at the given speed. The drive shaft transmits the composite torque to the gearbox and generator. The electrical energy generated by the generator is connected to the grid simulator under controllable grid conditions through the wind power converter, thereby realizing comprehensive testing of wind turbine sub-components under different grid conditions.

[0019] A further improvement of this invention is that: the first switch and the third switch are in the open state, the second switch is in the closed state, and the wind turbine sub-component testing and evaluation system is in the wind power converter independent testing mode; in the wind power converter independent testing mode:

[0020] The upper-level controller, based on real-time simulation, communicates the voltage and angular frequency signals of the generator model to the integrated converter. The integrated converter controls the simulated operating state of the actual generator, and then outputs through the transformer and wind power converter, and feeds back to the AC grid through the grid simulator of the controllable grid operating conditions.

[0021] Secondly, the present invention provides a control method for a wind turbine sub-component testing and evaluation system, based on a wind turbine sub-component testing and evaluation system, comprising:

[0022] The first switch is controlled to be closed and the second switch is controlled to be open, so that the wind turbine sub-component test and evaluation system is in the wind turbine transmission chain test mode.

[0023] The upper-level controller, based on real-time simulation and torque decoupling algorithm, decomposes the operating environment of the wind turbine into one speed signal and five non-torsional torque signals. The speed signal is sent to the integrated converter, and the five non-torsional torque signals are sent to the non-torsional loading device. The integrated converter controls the drive motor to run at the given speed. The drive shaft transmits the composite torque to the gearbox and generator. The electrical energy generated by the generator is connected to the grid simulator under controllable grid conditions through the wind power converter, thereby realizing comprehensive testing of wind turbine sub-components under different grid conditions.

[0024] A further improvement of the present invention is that the speed signal and non-torsional torque information come from the first real-time simulation unit, which has a turbulent wind model, a unit aerodynamic model and a unit dynamic model. The turbulent wind model inputs the collected wind speed data into the unit aerodynamic model to generate aerodynamic loads. The aerodynamic loads and feedback electromagnetic torques are input into the unit dynamic model to form speed signals and non-torsional torque information.

[0025] A further improvement of this invention lies in that: the integrated converter processes the speed signal output from the unit dynamics model to obtain the integrated converter switching control signal, thereby realizing the control of the drive motor, specifically including:

[0026] Speed ​​signal With the actual speed of the drive motor The speed controller generates the T-axis current command. ;

[0027] Drive motor feedback flux With magnetic flux given value The difference is calculated, and the magnetic flux controller generates the M-axis current command. ;

[0028] MT-axis component of the current on the drive motor side i sm , i st With the corresponding M-axis current command T-axis current command The voltage control target value is generated through the inner current loop control. , ;

[0029] Voltage control target value , The signal is fed into the modulation module, which ultimately generates the control signal for the integrated converter, thereby controlling the drive motor.

[0030] Thirdly, the present invention provides a control method for a wind turbine sub-component testing and evaluation system, based on a wind turbine sub-component testing and evaluation system, comprising:

[0031] The first and third switches are controlled to be in the open state, and the second switch is controlled to be in the closed state, so that the wind turbine sub-component test and evaluation system is in the wind power converter independent test mode.

[0032] The upper-level controller, based on real-time simulation, communicates the voltage and angular frequency signals of the generator model to the integrated converter. The integrated converter simulates the actual operating state of the generator, and then outputs the signal through the transformer and wind power converter. Finally, the signal is fed back to the AC grid through the grid simulator of the controllable grid operating conditions.

[0033] A further improvement of the present invention is that the voltage and angular frequency signals of the generator model to the integrated converter come from the second real-time simulation unit; the second real-time simulation unit includes a generator model, a unit aerodynamic model, a wind speed model, and a main controller model;

[0034] The wind speed model inputs wind into the unit's aerodynamic model. The unit's aerodynamic model generates torque based on the wind and transmits the torque to the generator model. The generator model feeds back the speed to the unit's aerodynamic model. The main controller model receives the speed and torque from the generator model and performs pitch control on the unit's startup model. At the same time, it communicates the torque signal to the wind power converter as an active power control command for the wind power converter.

[0035] A further improvement of this invention lies in: the electrical angle in the generator model. The relationship with rotational speed satisfies ; Angular frequency, The derivative of time;

[0036] Collect three-phase voltage on the low-voltage side of the transformer U sa , U sb , U sc and three-phase current i sa , i sb , i sc The dq-axis voltage is generated by Park transformation. u sd , u sq and dq axis current i sd , i sq ;

[0037] dq axis voltage u sd , u sq Respectively with reference voltage , The PI controller generates the inner loop current control command. , ;

[0038] dq axis current i sd , i sq With current inner loop control command , Voltage control command value is generated through current inner loop control. , ;

[0039] Voltage control command value , The modulation module generates control signals for the integrated converter, ultimately enabling the integrated converter to simulate generator operation.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] This invention provides a wind turbine sub-component testing and evaluation system, comprising: an integrated converter, a six-degree-of-freedom loading subsystem, a wind turbine, and a grid simulator. The six-degree-of-freedom loading subsystem includes a drive motor and a non-torque loading device. The wind turbine includes a gearbox, a generator, and a wind power converter. The drive motor, the non-torque loading device, the gearbox, and the generator are connected sequentially. The output of the generator is connected to the wind power converter. The integrated converter is connected to the drive motor via a first switch and to the wind power converter via a second switch. The integrated converter is used to control the drive motor or simulate the generator. The output of the wind power converter is connected to the grid simulator. The grid simulator is used to receive the electrical energy output by the wind power converter and simulate grid operating conditions. This system has both drivetrain testing and independent converter testing functions, and can flexibly switch operating modes according to testing needs, reducing drivetrain wear and energy loss, lowering testing costs, and expanding testing scenarios. During drivetrain testing, the system can eliminate interference by pre-testing the converter, completing the overall performance test of the wind turbine step by step, significantly shortening the testing time.

[0042] The test and evaluation system of this invention has transmission chain test and independent converter test modes, and the topology transformation of the test and evaluation system can be realized by switching the host computer switch.

[0043] In this invention, the integrated converter has two control modes: In the drive train test mode, based on real-time simulation including wind speed model, unit aerodynamic model and dynamic model, speed command is dynamically issued to the integrated converter, and the integrated converter controls the drive motor through speed and flux linkage outer loop and current inner loop control; In the converter independent test mode, based on real-time simulation including wind speed model, unit aerodynamic model and generator model, generator voltage and frequency command is issued to the integrated converter for control, and the integrated converter simulates the generator operating characteristics through voltage and current closed loop.

[0044] In this invention, in the transmission chain test mode, the converter test mode can be switched by the host computer switch. Based on the pre-test of the converter, interference links in the transmission chain test are eliminated, mechanical wear and energy loss are reduced, and the overall performance test of the wind turbine is completed step by step, which greatly shortens the test time. Attached Figure Description

[0045] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0046] Figure 1 This is a schematic diagram of the structure of a wind turbine sub-component testing and evaluation system according to an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of a wind turbine sub-component testing and evaluation system in wind turbine drivetrain testing mode according to an embodiment of the present invention;

[0048] Figure 3 This is a block diagram of the integrated converter control in the wind turbine drive train test mode.

[0049] Figure 4 A schematic diagram of the independent test mode for wind turbine converters;

[0050] Figure 5 This is a block diagram of the integrated converter control in the independent test mode of the wind turbine converter. Detailed Implementation

[0051] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0052] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0053] Please see Figure 1 As shown, this embodiment of the invention provides a wind turbine sub-component testing and evaluation system, including a grid simulator, a controllable load, a wind power converter, a generator, a gearbox, a non-torque loading device, a drive motor, a comprehensive converter, and auxiliary equipment. The non-torque loading device and the drive motor together constitute a six-degree-of-freedom loading subsystem. The grid simulator and the comprehensive converter are both back-to-back converter structures, i.e., front-end rectification + back-end inversion. The grid simulator is used to simulate grid operating conditions, including voltage faults and disturbances, frequency disturbances, harmonic generation, etc., providing a controllable grid environment for testing various components of the wind turbine.

[0054] The AC power grid connects the integrated converter and the power grid simulator; the output of the integrated converter is connected to the drive motor via switch K1 and to the transformer input via switch K2, and the transformer output is connected to the wind power converter input; the drive motor, non-torque loading device, gearbox, and generator are coaxially connected; the generator output is connected to the wind power converter input via switch K3, and the wind power converter output is connected to the power grid simulator; the wind power converter output is also connected to a controllable load via switch K4.

[0055] The integrated converter is mainly used to control the drive motor and simulate the generator, corresponding to two operating modes of the test system. Mode 1 is the wind turbine drivetrain test mode. In this mode, switch K1 is closed, switch K2 is open, switch K3 is closed, and switch K4 can be closed or opened depending on the test content. In this mode, the integrated converter is used to control the drive motor. Mode 2 is the wind power converter independent test mode. In this mode, switch K1 is open, switch K2 is closed, switch K3 is open, and switch K4 can be closed or opened depending on the test content. In this mode, the integrated converter is used to simulate the generator control, providing a controllable power generation scenario for wind power converter testing.

[0056] Mode 1: Wind turbine drivetrain test mode:

[0057] Please see Figure 2 As shown, in the wind turbine drivetrain test mode, this embodiment of the invention provides a control method for a wind turbine sub-component test and evaluation system, including:

[0058] When switch K1 is closed, switch K2 is open, and switch K3 is closed, the upper-level controller, based on real-time simulation and torque decoupling algorithm, decomposes the operating environment of the wind turbine into one speed signal and five non-torsional torque signals. The speed signal is sent to the integrated converter, and the five non-torsional torque signals are sent to the non-torsional loading device. The integrated converter controls the drive motor to run at the given speed. The drive shaft transmits the composite torque to the gearbox and generator. The electrical energy generated by the generator is connected to the grid simulator under controllable grid connection conditions via the wind power converter, thereby realizing comprehensive testing of wind turbine sub-components under complex operating conditions and various grid faults and disturbances.

[0059] The integrated converter reference speed signal comes from real-time simulation unit 1, which includes a turbulent wind model, a turbine aerodynamic model, and a turbine dynamics model. The turbulent wind model collects wind speed data from actual wind turbine operation on-site, providing a time-series signal of the actual wind speed. The turbulent wind model inputs the actual wind speed data from the on-site wind turbine operation into the turbine aerodynamic model to generate aerodynamic loads. These aerodynamic loads and feedback electromagnetic torque (from the actual electromagnetic torque measurement value of the drive motor) are then input into the turbine dynamics model to form a speed signal and non-torsional torque information. With the actual speed of the drive motor The speed controller generates the T-axis current command. ,Right now:

[0060]

[0061] In the formula, The transfer function for the speed controller.

[0062] Drive motor feedback flux With magnetic flux given value (Based on the speed difference table of the drive motor, obtained by looking up the table) The difference is calculated, and the flux linkage controller generates the M-axis current command. ,Right now

[0063]

[0064] In the formula, This is the transfer function for the flux linkage controller.

[0065] MT-axis component of the current on the drive motor side i sm , i st With the corresponding M-axis current command T-axis current command The voltage control target value is generated through the inner current loop control. , ,Right now:

[0066]

[0067] In the formula, The transfer function for the current controller.

[0068] Voltage control target value , The signal is fed into the modulation module, which ultimately generates the integrated converter switching control signal to control the drive motor. See the control block diagram below. Figure 3 .

[0069] Mode 2, Independent Testing Mode for Wind Power Converters:

[0070] Please see Figure 4 As shown, in the independent test mode of the wind turbine converter, this embodiment of the invention provides a control method for a wind turbine sub-component test and evaluation system, including:

[0071] Switch K1 is open, switch K2 is closed, and switch K3 is open. The upper-level controller, based on real-time simulation, communicates the voltage and angular frequency signals of the generator model to the integrated converter. The integrated converter controls the simulated operating state of the actual generator, and then outputs through the transformer and wind power converter, and feeds back to the grid through the grid simulator of the controllable grid operating conditions.

[0072] Integrated converter reference voltage , angular frequency From real-time simulation unit 2, which includes a generator model, a turbine aerodynamic model, a wind speed model, and a main controller model. The wind speed model inputs wind into the turbine aerodynamic model, which generates torque based on the wind and transmits the torque to the generator model. The generator model then feeds back the rotational speed to the turbine aerodynamic model. The main controller model receives the rotational speed and torque from the generator model and performs pitch control on the turbine startup model. Simultaneously, it communicates the torque signal to the wind power converter as active power control commands. The generator model's electrical angle... The relationship with rotational speed satisfies .

[0073] Collect the low-voltage side voltage of the transformer U sa , U sb , U sc and current i sa , i sb , i sc The dq-axis voltage is generated by Park transformation. u sd , usq and dq axis current i sd , i sq ,Right now

[0074]

[0075] dq axis voltage u sd , u sq Respectively with reference voltage , The PI controller generates the inner loop current control command. , ,Right now

[0076]

[0077] In the formula, Transfer function for PI controller; reference voltage , This is the rated voltage value on the generator side of the wind power converter, which is generally given as follows: This is the rated phase voltage amplitude. =0;

[0078] dq axis current i sd , i sq With current command , Voltage control command value is generated through current inner loop control. , ,Right now

[0079]

[0080] In the formula, This is the transfer function for the integrated converter current inner loop controller in the converter independent test mode. L eq This is the equivalent value of the output filter inductance and transformer inductance of the integrated converter.

[0081] Voltage control command value , The modulation module generates control signals for the integrated converter, ultimately enabling the integrated converter to simulate generator operation. The specific control block diagram is shown below. Figure 5 As shown. In one specific embodiment, the voltage control command value... , The control signal for the integrated converter is generated through modulation algorithms such as carrier phase shift or SVPWM.

[0082] This invention proposes a testing and evaluation system and control method for wind turbine sub-components. The testing and evaluation system has both drivetrain testing and independent converter testing and evaluation functions, and can switch between two operating modes via multiple switches controlled by a host computer, allowing for convenient switching. The integrated converter used has dual-mode control capabilities: in drivetrain testing mode, speed commands are sent to the integrated converter based on the real-time simulation unit of the upper-level controller, and the drive motor is controlled through the outer speed loop and inner current loop, providing operating conditions for drivetrain testing; in independent converter testing mode, generator voltage and frequency commands are sent to the integrated converter based on the real-time simulation unit of the upper-level controller, and the generator operating characteristics are simulated through the outer voltage loop and inner current loop, providing flexible testing conditions for converter testing. In drivetrain testing mode, the converter testing mode can be switched via a host computer switch first. Based on the pre-testing of the converter, interference links in drivetrain testing are eliminated, reducing mechanical wear and energy loss, and completing the overall performance test of the wind turbine step by step, significantly shortening the testing time. In the converter independent test mode, the integrated converter runs in the simulated generator mode. The generator operating condition settings are simple and do not require wind turbine drive chain, which simplifies the converter test scenario and greatly improves test flexibility.

[0083] Wind turbine drivetrain testing platforms can perform drivetrain and converter tests. However, in scenarios requiring only converter testing, the testing process using this platform is complex and costly, while existing converter testing platforms struggle to meet the testing needs of the drivetrain as well. This invention proposes a wind turbine sub-component testing and evaluation system and control method. It presents a test system topology integrating a drivetrain testing platform and a converter testing platform, and proposes a dual-mode control method for the integrated converter. The integrated converter can control the drive motor, providing operating conditions for drivetrain testing, and can also simulate generator operation, providing flexible testing conditions for individual converter testing. The operating mode can be flexibly switched according to testing requirements, reducing drivetrain wear and energy consumption, lowering testing costs, and broadening the testing scenarios.

[0084] Considering the limitations of current testing platforms in terms of functionality and flexibility, this invention proposes a system topology and control method for testing different components. Based on this system and control method, a testing environment can be provided for the wind turbine drivetrain and converter. Furthermore, by pre-testing the converter, the overall performance testing of the wind turbine can be completed step-by-step, eliminating interference and significantly shortening testing time. In addition, when testing the converter separately, power electronic equipment simulates generator operation, simplifying generator operating condition settings and eliminating mechanical drive components, thus simplifying the converter testing scenario and greatly improving testing flexibility. This testing and evaluation system can meet the testing and evaluation needs of centralized and distributed renewable energy transmission, as well as offshore wind power systems, providing technical and equipment support for the development of renewable energy technologies.

[0085] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0086] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0087] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0088] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A testing and evaluation system for wind turbine sub-components, characterized in that, include: Integrated converter, six-degree-of-freedom loading subsystem, wind turbine generator and power grid simulator; The six-degree-of-freedom loading subsystem includes a drive motor and a non-torque loading device; the wind turbine includes a gearbox, a generator, and a wind power converter; the drive motor, the non-torque loading device, the gearbox, and the generator are connected in sequence; the output of the generator is connected to the wind power converter; The integrated converter is connected to the drive motor via a first switch and to the wind power converter via a second switch; the integrated converter is used to control the drive motor or simulate a generator. The output of the wind power converter is connected to a power grid simulator; the power grid simulator is used to receive the electrical energy output by the wind power converter and simulate the power grid operating conditions.

2. The wind turbine sub-component testing and evaluation system according to claim 1, characterized in that, The power grid simulator and the integrated converter are both back-to-back converters; the power grid operating conditions include voltage faults and disturbances, frequency disturbances, and harmonic generation.

3. The wind turbine sub-component testing and evaluation system according to claim 1, characterized in that, A transformer is also connected in series between the second switch and the wind power converter.

4. The wind turbine sub-component testing and evaluation system according to claim 3, characterized in that, The generator's output is connected to the wind power converter's input via a third switch.

5. The wind turbine sub-component testing and evaluation system according to claim 1, characterized in that, The output of the wind power converter is also connected to a controllable load via a fourth switch.

6. The wind turbine sub-component testing and evaluation system according to claim 1, characterized in that, It also includes an AC power grid; the AC power grid connects the integrated converter and the power grid simulator.

7. The wind turbine sub-component testing and evaluation system according to claim 1, characterized in that, The first switch is in the closed state, the second switch is in the open state, and the wind turbine sub-component testing and evaluation system is in the wind turbine drivetrain testing mode; in the wind turbine drivetrain testing mode: The upper-level controller, based on real-time simulation and torque decoupling algorithm, decomposes the operating environment of the wind turbine into one speed signal and five non-torsional torque signals. The speed signal is sent to the integrated converter, and the five non-torsional torque signals are sent to the non-torsional loading device. The integrated converter controls the drive motor to run at the given speed. The drive shaft transmits the composite torque to the gearbox and generator. The electrical energy generated by the generator is connected to the grid simulator under controllable grid conditions through the wind power converter, thereby realizing comprehensive testing of wind turbine sub-components under different grid conditions.

8. The wind turbine sub-component testing and evaluation system according to claim 4, characterized in that, The first and third switches are in the open state, the second switch is in the closed state, and the wind turbine sub-component testing and evaluation system is in the wind power converter independent testing mode; in the wind power converter independent testing mode: The upper-level controller, based on real-time simulation, communicates the voltage and angular frequency signals of the generator model to the integrated converter. The integrated converter controls the simulated operating state of the actual generator, and then outputs through the transformer and wind power converter, and feeds back to the AC grid through the grid simulator of the controllable grid operating conditions.

9. A control method for a wind turbine sub-component testing and evaluation system, characterized in that, A wind turbine sub-component testing and evaluation system according to claim 1 includes: The first switch is controlled to be closed and the second switch is controlled to be open, so that the wind turbine sub-component test and evaluation system is in the wind turbine transmission chain test mode. The upper-level controller, based on real-time simulation and torque decoupling algorithm, decomposes the operating environment of the wind turbine into one speed signal and five non-torsional torque signals. The speed signal is sent to the integrated converter, and the five non-torsional torque signals are sent to the non-torsional loading device. The integrated converter controls the drive motor to run at the given speed. The drive shaft transmits the composite torque to the gearbox and generator. The electrical energy generated by the generator is connected to the grid simulator under controllable grid conditions through the wind power converter, thereby realizing comprehensive testing of wind turbine sub-components under different grid conditions.

10. The control method for a wind turbine sub-component testing and evaluation system according to claim 9, characterized in that, The speed signal and non-torsional torque information come from the first real-time simulation unit, which has a turbulent wind model, a unit aerodynamic model and a unit dynamics model. The turbulent wind model inputs the collected wind speed data into the unit aerodynamic model to generate aerodynamic loads. The aerodynamic loads and feedback electromagnetic torques are input into the unit dynamics model to form speed signals and non-torsional torque information.

11. The control method for a wind turbine sub-component testing and evaluation system according to claim 10, characterized in that, The integrated converter processes the speed signal output from the unit's dynamic model to obtain the control signal for the integrated converter, thereby controlling the drive motor. Specifically, this includes: Speed ​​signal With the actual speed of the drive motor The speed controller generates the T-axis current command. ; Drive motor feedback flux With magnetic flux given value The difference is calculated, and the magnetic flux controller generates the M-axis current command. ; MT-axis component of the current on the drive motor side i sm , i st With the corresponding M-axis current command T-axis current command The voltage control target value is generated through the inner current loop control. , ; Voltage control target value , The signal is fed into the modulation module, which ultimately generates the control signal for the integrated converter, thereby controlling the drive motor.

12. A control method for a wind turbine sub-component testing and evaluation system, characterized in that, A wind turbine sub-component testing and evaluation system based on claim 4 includes: The first and third switches are controlled to be in the open state, and the second switch is controlled to be in the closed state, so that the wind turbine sub-component test and evaluation system is in the wind power converter independent test mode. The upper-level controller, based on real-time simulation, communicates the voltage and angular frequency signals of the generator model to the integrated converter. The integrated converter simulates the actual operating state of the generator, and then outputs the signal through the transformer and wind power converter. Finally, the signal is fed back to the AC grid through the grid simulator of the controllable grid operating conditions.

13. The control method for a wind turbine sub-component testing and evaluation system according to claim 12, characterized in that, The voltage and angular frequency signals from the generator model to the integrated converter come from the second real-time simulation unit; the second real-time simulation unit includes the generator model, the unit aerodynamic model, the wind speed model, and the main controller model. The wind speed model inputs wind into the unit's aerodynamic model. The unit's aerodynamic model generates torque based on the wind and transmits the torque to the generator model. The generator model feeds back the speed to the unit's aerodynamic model. The main controller model receives the speed and torque from the generator model and performs pitch control on the unit's startup model. At the same time, it communicates the torque signal to the wind power converter as an active power control command for the wind power converter.

14. The control method for a wind turbine sub-component testing and evaluation system according to claim 13, characterized in that, Electrical angle in generator model The relationship with rotational speed satisfies ; Angular frequency, The derivative of time; Collect three-phase voltage on the low-voltage side of the transformer U sa , U sb , U sc and three-phase current i sa , i sb , i sc The dq-axis voltage is generated by Park transformation. u sd , u sq and dq axis current i sd , i sq ; dq axis voltage u sd , u sq Respectively with reference voltage , The PI controller generates the inner loop current control command. , ; dq axis current i sd , i sq With current inner loop control command , Voltage control command value is generated through current inner loop control. , ; Voltage control command value , The modulation module generates control signals for the integrated converter, ultimately enabling the integrated converter to simulate generator operation.

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