Wind turbine transmission system test platform

Abstract

The present disclosure provides a transmission system test platform for a wind turbine generator set, including a power supply module, a drive module and a module to be tested; the power supply module is connected to the drive module for supplying power to the drive module; a variable component is switched to realize the switching of the common DC bus state and the common AC bus state of the transmission system test platform; the drive module is connected to the module to be tested, and is used to drive the module to be tested to generate electric energy in the common DC bus state, or drive the module to be tested to transmit electric energy in the common AC bus state, so as to perform a test. Through the variable component, the common DC bus state and the common AC bus state of the transmission system test platform can be switched flexibly according to the needs of the module to be tested, so as to reduce the bus power supply burden in the test of high-power units, so that the transmission system test platform of the wind turbine generator set can meet different types of high-power (above 25MW) modules to be tested, and fill the gap of high-power test benches in the industry.

Description

Technical Field

[0001] The present disclosure relates to a transmission system test platform, and in particular to a transmission system test platform for a wind turbine generator set. Background Art

[0002] With the rapid development of the wind power industry, a significant problem has gradually emerged: the industry lacks a test platform that can support high-power (above 25MW) testing. This lack has led to the challenge of various motor, gearbox and converter component manufacturers being unable to conduct comprehensive performance evaluation and verification on their own. The root cause is that the design power of existing drive units and energy feedback units is not enough to cope with such high-level requirements. This not only limits the speed of technological innovation, but also affects the improvement of product quality.

[0003] In addition, most current test benches can only support a limited number of electrical connection methods, and their internal structures are usually fixed. This relatively single configuration mode is difficult to adapt to the requirements of diverse application scenarios, such as compatibility testing of equipment at different rated power levels or stability testing under complex conditions such as grid frequency fluctuations that may exist in specific regions.

[0004] Last but not least, many existing test platforms lack sufficient redundant design mechanisms. Once a critical component such as a power module fails, it will directly lead to the shutdown of the entire system, which will in turn affect the normal progress of all subsequent planned test activities. This situation will not only waste precious time resources, but may also cause economic losses and even safety hazards to related companies. Summary of the invention

[0005] The technical problem to be solved by the present disclosure is to overcome the defects of the prior art in that the electrical connection method is single, the electric energy feedback design is lacking, and the test of high-power units cannot be met, and to provide a transmission system test platform for a wind turbine.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present disclosure provides a transmission system test platform for a wind turbine generator set, comprising a power supply module, a drive module and a module to be tested;

[0008] The power supply module is connected to the driving module and is used to supply power to the driving module;

[0009] Wherein, the power supply module includes at least two conversion units, and the conversion unit includes two variable components;

[0010] Switching the variable component to achieve switching between a common DC bus state and a common AC bus state of the transmission system test platform;

[0011] The driving module is connected to the module to be tested, and is used to drive the module to be tested to generate electric energy in a state of sharing a DC bus, or to drive the module to be tested to transmit electric energy in a state of sharing an AC bus, so as to perform a test;

[0012] Among them, the common DC bus state corresponds to the conversion unit being connected to the drive module and the module to be tested respectively through the AC output terminal, and the common AC bus state corresponds to the conversion unit being connected to the drive module through the AC output terminal, and the module to be tested is driven by the drive module to produce AC power for testing.

[0013] Preferably, the driving module includes a traction machine, and the module to be tested includes a test generator;

[0014] In response to the transmission system test platform being in a common DC bus state, one of the variable components in each of the conversion units is switched to a first inverter, and another of the variable components is switched to a second inverter, and the first inverter and the second inverter share the same DC bus;

[0015] The DC input end of the first inverter is connected to the DC bus, and the AC output end of the first inverter is connected to the traction machine;

[0016] The AC input terminal of the second inverter is connected to the test generator, and the DC output terminal of the second inverter is connected to the DC bus;

[0017] The traction machine is used to drag the test generator to rotate, and the test generator generates electrical energy which is fed back to the bus.

[0018] Preferably, the driving module includes a traction machine and a generator;

[0019] In response to the transmission system test platform being in a common AC bus state, one of the variable components in each of the conversion units is switched to a first inverter, and another of the variable components is switched to a rectifier;

[0020] The rectifier is used to filter the DC input current of the inverter, and the AC output end of the inverter is connected to the drive module;

[0021] The traction machine drives the generator to generate electric energy and transmits it to the module to be tested;

[0022] The power supply module and the module to be tested share the same AC bus, and the module to be tested feeds the transmitted electric energy back to the AC bus.

[0023] Preferably, the module to be tested further includes a test gear box (GEAR BOX), and the test gear box is used to connect the traction machine and the generator.

[0024] Preferably, the module to be tested includes a test current conversion module and a grid adaptability device;

[0025] The test converter module is connected to the generator and is used to transmit the electric energy generated by the generator to the grid adaptability device;

[0026] The input end of the grid adaptability device receives the electric energy output by the test converter module through an input transformer, and the output end of the grid adaptability device is connected to the grid through an output transformer, so as to frequency-modulate the electric energy output by the test converter module and incorporate it into the AC bus.

[0027] Preferably, the test converter module comprises at least two converter test circuits connected in parallel.

[0028] Preferably, the converter test circuit comprises a converter to be tested, a transformer and a circuit breaker connected in series in sequence.

[0029] Preferably, the power supply module further includes a protection unit, the protection unit is connected to the conversion unit, and the protection unit is used to turn on or off the power supply module.

[0030] Preferably, the protection unit comprises a circuit breaker, a rectifier transformer and a rectifier frequency converter which are connected in sequence.

[0031] Preferably, the rectifier transformer comprises a multi-winding rectifier transformer.

[0032] Preferably, the variable component is an IGBT (Insulated Gate Bipolar Transistor) component.

[0033] Preferably, the transmission system test platform includes at least two power supply modules, at least one of which serves as a redundant power supply module.

[0034] The positive progressive effect of the present disclosure lies in: through variable components, flexible switching can be carried out according to the needs of the modules to be tested, so as to realize the switching of the common DC bus state and the common AC bus state of the transmission system test platform, and utilize the power feedback of the common DC bus state and the common AC bus state to reduce the bus power supply burden in the test of high-power units, so that the transmission system test platform of the wind turbine unit can meet the needs of different types of high-power modules to be tested, filling the gap of high-power test benches in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1A schematic diagram of the circuit structure of a transmission system test platform for a wind turbine generator set provided by an exemplary embodiment of the present disclosure;

[0036] Figure 2 A schematic diagram of a circuit structure of a DC bus mode in a transmission system test platform of a wind turbine generator set provided by an exemplary embodiment of the present disclosure;

[0037] Figure 3 A schematic diagram of a first circuit structure of a common AC bus mode in a transmission system test platform of a wind turbine generator set provided by an exemplary embodiment of the present disclosure;

[0038] Figure 4 A schematic diagram of a second circuit structure of a common AC bus mode in a transmission system test platform of a wind turbine set provided by an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0039] The present disclosure is further described below by way of examples, but the present disclosure is not limited to the scope of the examples.

[0040] Prefixes such as "first" and "second" are used in the embodiments of the present disclosure only to distinguish different description objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present disclosure does not constitute a limitation on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and no unnecessary limitation should be constituted due to the use of such prefixes. In addition, in the description of the present embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0041] Example 1

[0042] This embodiment provides a transmission system test platform for a wind turbine generator set. Figure 1 As shown, it includes a power supply module 100, a driving module and a module to be tested;

[0043] The power supply module 100 is connected to the driving module and is used to supply power to the driving module;

[0044] The power supply module 100 includes at least two conversion units 110, and the conversion unit 110 includes two variable components 111;

[0045] Switching the variable component 111 to achieve switching between a common DC bus state and a common AC bus state of the transmission system test platform;

[0046] The driving module is connected to the module to be tested, and is used to drive the module to be tested to generate electric energy in a state of sharing a DC bus, or to drive the module to be tested to transmit electric energy in a state of sharing an AC bus, so as to perform a test;

[0047] Among them, the common DC bus state corresponds to the conversion unit 110 being connected to the driving module and the module to be tested respectively through the AC output terminal, and the common AC bus state corresponds to the conversion unit 110 being connected to the driving module through the AC output terminal, and the module to be tested is driven by the driving module to produce AC power for testing.

[0048] exist Figure 1 The middle drive module at least includes a traction machine, Inv1, Inv2, Inv3...Inv8 are the first variable component, the second variable component, the third variable component...the eighth variable component, Conv1, Conv2, Conv3, Conv4 are the first inverter rectifier component, the second inverter rectifier component, the third inverter rectifier component, the fourth inverter rectifier component, K1, K2, K3...K8, K9 are the first circuit breaker, the second circuit breaker, the third circuit breaker...the eighth circuit breaker, the ninth circuit breaker, T1, T2, T3...T6 are the first transformer, the second transformer, the third transformer...the sixth transformer, and a conversion unit 110 includes a inverter rectifier component and two variable components 111.

[0049] In this solution, variable components are used to flexibly switch according to the needs of the modules to be tested, so as to realize the switching of the common DC bus state and the common AC bus state of the transmission system test platform. The power feedback of the common DC bus state and the common AC bus state is utilized to reduce the bus power supply burden in the test of high-power units, so that the transmission system test platform of the wind turbine unit can meet the needs of different types of high-power (above 25MW) modules to be tested, thus filling the gap of high-power test benches in the industry.

[0050] As a feasible approach, Figure 2 As shown, the driving module 200 includes a traction machine 210, and the module to be tested 300 includes a test generator 310;

[0051] In response to the transmission system test platform being in a common DC bus state, one of the variable components 111 in each of the conversion units 110 is switched to a first inverter, and another variable component is switched to a second inverter, and the first inverter and the second inverter share the same DC bus;

[0052] The DC input end of the first inverter is connected to the DC bus, and the AC output end of the first inverter is connected to the traction machine 210;

[0053] The AC input terminal of the second inverter is connected to the test generator 310, and the DC output terminal of the second inverter is connected to the DC bus;

[0054] The traction machine 210 is used to traction the test generator 310 to rotate, and the test generator 310 generates electric energy which is fed back to the bus.

[0055] exist Figure 2 In the example, based on the fact that the drive module 200 only includes the traction machine 210, the module to be tested 300 includes the test generator 310. At this time, the eighth circuit breaker K8 is closed, and the first variable component Inv1, the third variable component Inv3, the fifth variable component Inv5 and the seventh variable component Inv7 are switched to the first inverter to connect with the traction machine 210 as the traction end of the generator. The second variable component Inv2, the fourth variable component Inv4, the sixth variable component Inv6 and the eighth variable component Inv8 in the variable component 111 are switched to the second inverter to connect with the test generator 310 as the generator end. The traction machine 210 drives the test generator 310 to rotate. The two inverters of the same unit are in a common DC bus state. The test generator 310 generates electrical energy based on the traction of the traction machine 210.

[0056] Correspondingly, the electric energy generated by the test generator is fed back on the common DC bus of the same conversion unit such as the first variable component Inv1 and the second variable component Inv2, the third variable component Inv3 and the fourth variable component Inv4, the fifth variable component Inv5 and the sixth variable component Inv6, the seventh variable component Inv7 and the eighth variable component Inv8.

[0057] In this solution, the electric energy generated by the generator is fed back to the system through the DC bus, which can effectively recover and reuse this energy, not only reducing energy waste but also reducing operating costs; the use of DC bus feedback makes the control of the test generator more flexible, and the size and direction of the feedback current can be adjusted according to actual needs to achieve different control goals. In the test environment, under the condition of simulating extreme working conditions, the test can be completed without adding additional load by feeding back electric energy through the DC bus, thereby avoiding the risk of equipment damage caused by overload. The use of multiple groups of parallel common DC bus structures can be suitable for high-power unit testing and testing of multiple power levels. In this embodiment, the transmission system test platform of the wind turbine set can meet the test of test generators above 25MW.

[0058] As an implementable manner, the driving module 200 includes a traction machine 210 and a generator 220;

[0059] In response to the transmission system test platform being in a common AC bus state, one of the variable components in each of the conversion units 110 is switched to a first inverter, and another of the variable components is switched to a rectifier;

[0060] The rectifier is used to filter the DC input current of the inverter, and the AC output end of the inverter is connected to the driving module 200;

[0061] The traction machine 210 drives the generator 220 to generate electric energy and transmit it to the module to be tested 300;

[0062] The power supply module 100 and the module to be tested 300 share the same AC bus, and the module to be tested 300 feeds the transmitted electric energy back to the AC bus.

[0063] exist Figure 3 In the embodiment, the drive module includes a tractor 210 and a generator 220, then the eighth circuit breaker K8 is disconnected, the second variable component Inv2, the third variable component Inv3, the sixth variable component Inv6 and the seventh variable component Inv7 are switched to the first inverter to connect to the tractor 210, the two inverters of different conversion units in the same power supply module are redundant, the first variable component Inv1, the fourth variable component Inv4, the fifth variable component Inv5 and the eighth variable component Inv8 of the variable component are switched to rectifiers, and the rectifier in each conversion unit is connected in parallel with the inverter rectifier component. This composite topology design can save power modules and test sites. The rectifier switched by the variable component can be used as a redundancy of the inverter rectifier component to ensure the normal operation of the conversion unit. At the same time, under different working conditions, the load sharing ratio of the rectifier and the inverter rectifier component can be adjusted as needed to achieve optimal efficiency and performance. At the same time, the heat generation is dispersed to avoid overheating of a single component, thereby extending the service life of the equipment and reducing the demand for the cooling system. Moreover, in the transmission system test platform of wind turbines, the parallel rectifier structure can provide better adaptability, adjust the output according to the actual situation of the power grid, ensure the accuracy and effectiveness of the test, provide faster response speed and better control accuracy, thereby improving the overall performance of the system.

[0064] The transmission system test platform of the wind turbine provided in this embodiment can be flexibly switched to an inverter or a rectifier according to the requirements of the module to be tested through variable components, so that the transmission system test platform of the wind turbine can meet the requirements of different types of modules to be tested. It can be tested by feeding back energy through a common DC bus or by a common AC bus, and both are multi-group parallel structures, which is convenient for the maintenance of the converter rectifier inverter module without affecting the test.

[0065] Example 2

[0066] As an implementable manner, the module to be tested 300 further includes a test gearbox, and the test gearbox is used to connect the traction machine 210 and the test generator 310 .

[0067] In this scheme, based on Figure 2 The transmission system test platform is in a common DC bus state, and the tractor 210 is connected to the test generator 310 through the test gearbox 320. When the tractor 210 is towing the test generator 310, a power loading test corresponding to the test gearbox and the transmission chain shaft system composed of the test gearbox and the test generator 310 can be implemented to meet the test requirements of various components in the wind turbine 220, obtain corresponding test data and verify the design. The test data includes component wear, power curve characteristics and overload capacity, etc.

[0068] As an achievable manner, the module to be tested 300 includes a test current conversion module 330 and a grid adaptability device 340;

[0069] The test converter module 330 is connected to the generator 220 and is used to transmit the electric energy generated by the generator 220 to the grid adaptability device 340;

[0070] The input end of the grid adaptability device 340 receives the electric energy output by the test converter module 330 through an input transformer, and the output end of the grid adaptability device 340 is connected to the grid through an output transformer, so as to frequency-modulate the electric energy output by the test converter module 330 and incorporate it into the AC bus.

[0071] As an achievable manner, the converter test circuit includes a converter to be tested, a transformer and a circuit breaker connected in series in sequence.

[0072] In this scheme, based on Figure 3 The transmission system test platform is in a common AC bus state. The generator 220 feeds back the electric energy to the AC bus through the fourth transformer T4 and the fifth transformer T5 through the test converter module. The test converter module 330 includes multiple parallel converter test circuits. The converter test circuit includes several series-connected converters to be tested. Each converter test circuit is connected in series with the corresponding transformer and circuit breaker. The electric energy generated by the generator 220 is fed back to the AC bus by the test converter module, which can effectively recover and reuse this part of energy. The need for a separate feedback circuit or device for the test converter is reduced, the structure of the entire test platform is simplified, and the complexity and cost of the system are reduced.

[0073] Correspondingly, the grid adaptability device 340 matches the corresponding input and output voltages, and is arranged between the third transformer T3 and the sixth transformer T6, with the sixth transformer T6 as the input transformer and the third transformer T3 as the output transformer. The electric energy generated by the generator 220 passes through the test converter, and the electric energy flows to the sixth transformer T6 through the fourth transformer T4 and / or the fifth transformer T5, and is connected to the transformer T3 after frequency modulation by the grid adaptability device 340, and finally merged into the grid. The third transformer T3 provides the power supply for the voltage adaptability device, and the sixth transformer T6 provides the voltage and voltage amplitude required by the test converter module 330. By combining the transmission system test platform of the wind turbine set with the grid simulation system and the busbar multi-frequency multiplexing design, the integrated function of power loading and grid adaptability testing is realized, which can be used for the testing of units with different frequencies.

[0074] As an implementable manner, the test converter module 330 includes at least two converter test circuits connected in parallel.

[0075] In this solution, multiple groups of parallel common AC bus structures are used, which can be applied to high-power unit testing and multiple power level testing. Common AC bus feedback allows current to flow on the same bus, which facilitates monitoring and analysis of system parameters such as current and voltage, and helps to better understand the operating status and performance of the entire system. The feedback power of the test inverter can stabilize the voltage of the AC bus to a certain extent, reduce voltage fluctuations, and provide a relatively stable power supply environment for other equipment; at the same time, it is closer to the connection between the inverter and the power supply in actual applications, and can more realistically test the performance and characteristics of the inverter under test under actual working conditions.

[0076] As an implementable manner, the power supply module further includes a protection unit, which is connected to the conversion unit and is used to turn on or off the power supply module.

[0077] In this solution, overload protection is provided by the protection unit to prevent damage to the equipment due to overload. At the same time, the current is smoothed to reduce fluctuations and shocks in the power system.

[0078] As an implementable manner, the protection unit includes a circuit breaker, a rectifier transformer and a rectifier frequency converter connected in sequence.

[0079] In this solution, the first transformer T1 and the second transformer T2 are rectifier transformers, which can achieve voltage rise and fall to meet the voltage requirements of different devices. The rectifier transformer includes a rectifier circuit that can convert AC power into DC power. It meets the test module 300 that requires a DC power supply. At the same time, the rectifier transformer can improve the energy efficiency of the power system, reduce energy consumption, reduce harmonic pollution in the power system, and improve the quality of power.

[0080] As a feasible manner, the rectifier transformer is a multi-winding rectifier transformer.

[0081] In this solution, a double-winding rectifier transformer can be used. By increasing the voltage through a step-up transformer, the loss of the transmission line can be reduced, and the power transmission can be made more efficient; harmonic pollution in the power system can be reduced, and the power quality can be improved. A three-winding rectifier transformer can also be used. One winding can be connected to the grid side to obtain input power, and the other two windings can be connected to different conversion units respectively, so as to realize power supply to multiple loads at the same time or conduct different types of tests, thereby improving the versatility and flexibility of the test platform.

[0082] As an implementable manner, the variable component is an IGBT component.

[0083] In this solution, the IGBT component realizes the switching of the inverter or rectifier through software, and this conversion is realized based on the bidirectional conductive characteristics of the IGBT. The conversion from the inverter to the rectifier can be realized by controlling the gate voltage of the IGBT through software. In one embodiment, the IGBT component is a low-voltage IGBT component, and the operating voltage of the IGBT component is below 1200V.

[0084] As an implementable manner, the transmission system test platform includes at least two power supply modules 100 , and at least one of the power supply modules 100 serves as a redundant power supply module.

[0085] In this solution, by configuring at least one power supply module 100 as a redundant power supply module, the stability of the system is significantly improved. In the event of a failure in a normal working module, the system can still continue to supply power through the redundant module, thereby ensuring the continuity and stability of the entire system. The redundant power supply module minimizes the downtime caused by power failure by quickly switching to the backup power supply.

[0086] Although the specific embodiments of the present disclosure are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present disclosure is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present disclosure, but these changes and modifications all fall within the protection scope of the present disclosure.

Claims

1. A wind turbine transmission system test platform, characterized in that: Including power supply module, drive module and module to be tested; The power supply module is connected to the driving module and is used to supply power to the driving module; Wherein, the power supply module includes at least two conversion units, and the conversion unit includes two variable components; Switching the variable component to achieve switching between a common DC bus state and a common AC bus state of the transmission system test platform; The driving module is connected to the module to be tested, and is used to drive the module to be tested to generate electric energy in a state of sharing a DC bus, or to drive the module to be tested to transmit electric energy in a state of sharing an AC bus, so as to perform a test; Among them, the common DC bus state corresponds to the conversion unit being connected to the drive module and the module to be tested respectively through the AC output terminal, and the common AC bus state corresponds to the conversion unit being connected to the drive module through the AC output terminal, and the module to be tested is driven by the drive module to produce AC power for testing.

2. The transmission system test platform of a wind turbine according to claim 1, characterized in that: The driving module includes a traction machine, and the module to be tested includes a test generator; In response to the transmission system test platform being in a common DC bus state, one of the variable components in each of the conversion units is switched to a first inverter, and another of the variable components is switched to a second inverter, and the first inverter and the second inverter share the same DC bus; The DC input end of the first inverter is connected to the DC bus, and the AC output end of the first inverter is connected to the traction machine; The AC input terminal of the second inverter is connected to the test generator, and the DC output terminal of the second inverter is connected to the DC bus; The traction machine is used to drag the test generator to rotate, and the test generator generates electrical energy which is fed back to the bus.

3. The transmission system test platform of a wind turbine generator set according to claim 1, characterized in that: The driving module includes a traction machine and a generator; In response to the transmission system test platform being in a common AC bus state, one of the variable components in each of the conversion units is switched to a first inverter, and another of the variable components is switched to a rectifier; The rectifier is used to filter the DC input current of the inverter, and the AC output end of the inverter is connected to the drive module; The traction machine drives the generator to generate electric energy and transmits it to the module to be tested; The power supply module and the module to be tested share the same AC bus, and the module to be tested feeds the transmitted electric energy back to the AC bus.

4. The transmission system test platform of a wind turbine generator set according to claim 2, characterized in that: The module to be tested further comprises a test gearbox, and the test gearbox is used to connect the traction machine and the generator.

5. The transmission system test platform of the wind turbine according to claim 3, characterized in that: The modules to be tested include a test current conversion module and a power grid adaptability device; The test converter module is connected to the generator and is used to transmit the electric energy generated by the generator to the grid adaptability device; The input end of the grid adaptability device receives the electric energy output by the test converter module through an input transformer, and the output end of the grid adaptability device is connected to the grid through an output transformer, so as to frequency-modulate the electric energy output by the test converter module and incorporate it into the AC bus.

6. The transmission system test platform of the wind turbine generator set according to claim 5, characterized in that: The test current conversion module comprises at least two current converter test circuits connected in parallel.

7. The transmission system test platform of the wind turbine generator set according to claim 6, characterized in that: The converter test circuit comprises a converter to be tested, a transformer and a circuit breaker which are sequentially connected in series.

8. The transmission system test platform of a wind turbine according to any one of claims 1 to 7, characterized in that: The power supply module further includes a protection unit, which is connected to the conversion unit and is used to turn on or off the power supply module.

9. The transmission system test platform of the wind turbine generator set according to claim 8, characterized in that: The protection unit comprises a circuit breaker, a rectifier transformer and a rectifier frequency converter which are connected in sequence.

10. The transmission system test platform of a wind turbine generator set according to claim 9, characterized in that: The rectifier transformer includes a multi-winding rectifier transformer.

11. The transmission system test platform of a wind turbine generator set according to claim 8, characterized in that: The variable component is an IGBT component.

12. The transmission system test platform of a wind turbine generator set according to claim 8, characterized in that: The transmission system test platform includes at least two power supply modules, at least one of which serves as a redundant power supply module.

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