Dynamic model-physical integrated small and medium-sized direct-drive wind turbine generator set and its application method

Abstract

The present invention discloses a dynamic model-physical integrated small and medium-sized direct-drive wind power generator set and its application method. The generator set of the present invention includes a wind turbine and a direct-drive wind power generation system. The main shaft of the wind turbine is transmission-connected to the direct-drive wind power generation system. It also includes a wind turbine dynamic simulation system. The wind turbine dynamic simulation system includes an AC motor, a first AC-DC converter, a first DC-AC converter and a first isolation transformer. The AC motor is transmission-connected to the main shaft of the direct-drive wind power generation system. The output end of the AC motor is sequentially connected to the first AC-DC converter, the first DC-AC converter and the first isolation transformer. The present invention organically combines the physical wind power generation system with the wind turbine dynamic simulation system. On the one hand, it can effectively carry out the empirical work of scientific research results in the dynamic model wind power generation system. On the other hand, it can further carry out the operation verification work of scientific research results in the physical wind power generation system.

Description

Technical Field

[0001] The invention relates to a wind power generation technology for an electric power system, and in particular to a dynamic model-physical integrated small and medium-sized direct-drive wind power generator set and an application method thereof. Background Art

[0002] In order to achieve China's electricity carbon reduction, energy carbon reduction, and achieve the dual carbon goals, expanding the proportion of non-fossil energy represented by wind power and building a new power system with new energy as the main body has become the only way. However, the inherent power volatility and randomness of wind power and other new energy generation will also bring many adverse effects to the power grid, and in severe cases will even endanger the safe and stable operation of the power grid. In order to overcome the many adverse effects of wind power on the safe and stable operation of the power grid, the relevant control technologies of wind power (such as active power / reactive power control technology, primary frequency modulation control technology, active power change control technology, etc.) are also constantly being upgraded and transformed. In order to verify the correctness and reliability of wind power technology research results, a series of dynamic model verification work is generally required before actual application on site. Therefore, how to build a dynamic model verification platform that can effectively verify the research results of wind power technology has become a common concern of colleges and universities, research institutes and wind power control equipment manufacturers.

[0003] At present, the wind power simulation demonstration platform of many laboratories is generally constructed by using a wind turbine simulator + wind turbine power generation system. However, this method ignores the comparison with the actual wind turbine operation data, that is, whether the scientific research results verified on the wind power simulation demonstration platform are equally effective in the application of actual wind turbines with the same installed capacity needs further verification. Generally speaking, the success rate of scientific research results that can be verified on small and medium-sized wind turbines of the same type will be greatly improved when applied to large wind turbines of the same type. However, it is difficult for the existing wind power simulation demonstration platform to achieve this. Summary of the invention

[0004] Technical problem to be solved by the present invention: In view of the above-mentioned problems of the prior art, a dynamic model (dynamic simulation)-physical integrated small and medium-sized direct-drive wind turbine generator set and its application method are provided. The present invention organically combines the physical wind power generation system with the wind turbine dynamic simulation system. On the one hand, it can effectively carry out the empirical work of scientific research results in the dynamic model wind power generation system, and on the other hand, it can further carry out the operation verification work of scientific research results in the physical wind power generation system.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A dynamic model-physical integrated small and medium-sized direct-drive wind power generator set includes a wind turbine and a direct-drive wind power generation system, wherein the main shaft of the wind turbine is transmission-connected to the direct-drive wind power generation system, and also includes a wind turbine dynamic simulation system, wherein the wind turbine dynamic simulation system includes an AC motor, a first AC-DC converter, a first DC-AC converter and a first isolation transformer, wherein the AC motor is transmission-connected to the main shaft of the direct-drive wind power generation system, and the output end of the AC motor is sequentially connected to the first AC-DC converter, the first DC-AC converter and the first isolation transformer.

[0007] Optionally, the wind turbine dynamic simulation system further comprises a first DC capacitor, which is arranged in parallel between DC side busbars of the first AC-DC converter and the first DC-AC converter.

[0008] Optionally, the wind turbine dynamic simulation system further comprises a motor-side contactor, wherein the motor-side contactor is arranged in series between the AC motor and the AC side of the first AC-DC converter.

[0009] Optionally, the wind turbine dynamic simulation system further comprises a mains-side contactor, and the mains-side contactor is arranged in series between the AC side of the first DC-AC converter and the first isolation transformer.

[0010] Optionally, the wind turbine dynamic simulation system further comprises a mains-side reactor, wherein the mains-side reactor is arranged in series between the AC side of the first DC-AC converter and the mains-side contactor.

[0011] Optionally, the fully controlled switching device of the first AC-DC converter and the first DC-AC converter is one of an insulated gate bipolar power tube IGBT, an electron injection enhanced gate transistor IEGT, an integrated gate commutated thyristor IGCT and a turn-off thyristor GTO.

[0012] Optionally, the direct-drive wind power generation system includes a permanent magnet generator, a generator-side contactor, a second AC-DC converter, a second DC capacitor, a second DC-AC converter, a bus-side reactor, a bus-side contactor and a second isolation transformer. The permanent magnet generator is connected to the main shaft of the wind turbine through a transmission, and the output end of the permanent magnet generator is connected to the generator-side contactor, the second AC-DC converter, the second DC-AC converter, the bus-side reactor, the bus-side contactor and the second isolation transformer in sequence. The second DC capacitor is arranged in parallel between the DC side buses of the second AC-DC converter and the second DC-AC converter.

[0013] Optionally, a bidirectional DC-DC converter is arranged in parallel between the DC port between the first AC-DC converter and the first DC-AC converter in the wind turbine dynamic simulation system, and between the DC port between the second AC-DC converter and the second DC-AC converter in the direct-drive wind power generation system.

[0014] Optionally, the fully controlled switching devices of the second AC-DC converter and the second DC-AC converter are one of insulated gate bipolar power tube IGBT, electron injection enhanced gate transistor IEGT, integrated gate commutated thyristor IGCT and turn-off thyristor GTO.

[0015] Optionally, the second AC-DC converter is an AC-DC converter with a function of embedding a developable control program, and the second DC-AC converter is a DC-AC converter with a function of embedding a developable control program.

[0016] In addition, the present invention also provides an application method of the aforementioned dynamic model-physical integrated small and medium-sized direct-drive wind turbine generator sets, including: when it is necessary to verify the target wind turbine generator set strategy, controlling the wind turbine to fully retract the blades, and dynamically simulating the wind turbine by controlling the wind turbine dynamic simulation system to drive the direct-drive wind power generation system that runs the target wind turbine generator set strategy, so as to obtain the test results of the direct-drive wind power generation system that runs the target wind turbine generator set strategy under different working conditions; when it is necessary to perform power generation operations, controlling the wind turbine to release the blades, and by default only driving the direct-drive wind power generation system to generate electricity through the wind turbine, and only when the wind speed exceeds the set value, controlling the wind turbine dynamic simulation system to switch to the power generation mode, and driving the direct-drive wind power generation system and the wind turbine dynamic simulation system simultaneously through the wind turbine to generate electricity.

[0017] Compared with the prior art, the present invention has the following advantages: based on the existing small and medium-sized direct-drive wind turbine generator sets including wind turbines and direct-drive wind power generation systems, the present invention adds a wind turbine dynamic simulation system, the wind turbine dynamic simulation system includes an AC motor, a first AC-DC converter, a first DC-AC converter and a first isolation transformer, the AC motor is connected to the main shaft of the direct-drive wind power generation system by transmission, the output end of the AC motor is connected to the first AC-DC converter, the first DC-AC converter and the first isolation transformer in sequence, various operating conditions of the wind turbine set can be dynamically simulated through the wind turbine dynamic simulation system, and by organically combining the physical wind power generation system with the wind turbine dynamic simulation system, a good dynamic model demonstration and physical verification platform can be provided for wind power technology scientific research results, and used for the construction of a wind power technology scientific research results demonstration platform. On the one hand, it can effectively carry out the demonstration work of scientific research results in the dynamic model wind power generation system, and on the other hand, it can further carry out the operation verification work of scientific research results in the physical wind power generation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a generator set according to an embodiment of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of a generator set according to Embodiment 2 of the present invention.

[0020] Legend: 1. Wind turbine; 2. Direct-drive wind power generation system; 21. Permanent magnet generator; 22. Generator-side contactor; 23. Second AC-DC converter; 24. Second DC capacitor; 25. Second DC-AC converter; 26. Busbar-side reactor; 27. Busbar-side contactor; 28. Second isolation transformer; 3. Wind turbine dynamic simulation system; 31. AC motor; 32. First AC-DC converter; 33. First DC-AC converter; 34. First isolation transformer; 35. First DC capacitor; 36. Motor-side contactor; 37. Mains-side contactor; 38. Mains-side reactor; 4. Bidirectional DC-DC converter. DETAILED DESCRIPTION

[0021] Embodiment 1:

[0022] like Figure 1 As shown, this embodiment provides a dynamic model-physical integration small and medium-sized direct-drive wind power generator set, including a wind turbine 1 and a direct-drive wind power generation system 2, the main shaft of the wind turbine 1 is connected to the direct-drive wind power generation system 2 by transmission, and also includes a wind turbine dynamic simulation system 3, the wind turbine dynamic simulation system 3 includes an AC motor 31, a first AC-DC converter 32, a first DC-AC converter 33 and a first isolation transformer 34, the AC motor 31 is connected to the main shaft of the direct-drive wind power generation system 2 by transmission, and the output end of the AC motor 31 is connected to the first AC-DC converter 32, the first DC-AC converter 33 and the first isolation transformer 34 in sequence. See Figure 1 It can be seen that the output end of the direct-drive wind power generation system 2 in this embodiment is connected to the laboratory busbar, which can be used to detect the actual output electrical parameters of the direct-drive wind power generation system 2. The first isolation transformer 34 is directly connected to the mains, which can be used to use the mains as a power source to drive the wind turbine dynamic simulation system 3 to realize the wind turbine dynamic simulation, and can also use the wind turbine dynamic simulation system 3 to switch to the power generation mode to realize grid-connected power generation.

[0023] like Figure 1As shown, the wind turbine dynamic simulation system 3 of this embodiment also includes a first DC capacitor 35, which is arranged in parallel between the DC side busbars of the first AC-DC converter 32 and the first DC-AC converter 33. The first DC capacitor 35 can provide voltage support for the DC side busbars of the first AC-DC converter 32 and the first DC-AC converter 33.

[0024] like Figure 1 As shown, the wind turbine dynamic simulation system 3 of this embodiment also includes a motor side contactor 36, which is arranged in series between the AC motor 31 and the AC side of the first AC-DC converter 32. The motor side contactor 36 can realize the on-off control between the AC motor 31 and the AC side of the first AC-DC converter 32, so that it is safer and more reliable when the wind turbine dynamic simulation system 3 is put into operation or cut off.

[0025] like Figure 1 As shown, the wind turbine dynamic simulation system 3 of this embodiment also includes a mains side contactor 37, which is arranged in series between the AC side of the first DC-AC converter 33 and the first isolation transformer 34. The mains side contactor 37 can be used to implement on-off control between the AC side of the first DC-AC converter 33 and the first isolation transformer 34, thereby making the wind turbine dynamic simulation system 3 safer and more reliable when it is put into operation or cut off.

[0026] like Figure 1 As shown, the wind turbine dynamic simulation system 3 of this embodiment also includes a mains side reactor 38, which is arranged in series between the AC side of the first DC-AC converter 33 and the mains side contactor 37. The mains side reactor 38 can realize four-quadrant operation of the AC side of the first DC-AC converter 33.

[0027] In this embodiment, the fully controlled switch devices of the first AC-DC converter 32 and the first DC-AC converter 33 are one of insulated gate bipolar power transistors IGBT, electron injection enhanced gate transistors IEGT, integrated gate commutated thyristors IGCT and turn-off thyristors GTO.

[0028] like Figure 1As shown, the direct-drive wind power generation system 2 of this embodiment includes a permanent magnet generator 21, a generator-side contactor 22, a second AC-DC converter 23, a second DC capacitor 24, a second DC-AC converter 25, a bus-side reactor 26, a bus-side contactor 27 and a second isolation transformer 28. The permanent magnet generator 21 is connected to the main shaft of the wind turbine 1 by driving, and the output end of the permanent magnet generator 21 is connected to the generator-side contactor 22, the second AC-DC converter 23, the second DC-AC converter 25, the bus-side reactor 26, the bus-side contactor 27 and the second isolation transformer 28 in sequence. The second DC capacitor 24 is arranged in parallel between the DC side buses of the second AC-DC converter 23 and the second DC-AC converter 25.

[0029] In this embodiment, the fully controlled switch devices of the second AC-DC converter 23 and the second DC-AC converter 25 are one of the insulated gate bipolar power transistor IGBT, electron injection enhanced gate transistor IEGT, integrated gate commutated thyristor IGCT and turn-off thyristor GTO.

[0030] In this embodiment, the second AC-DC converter 23 is an AC-DC converter with a developable control program embedding function, and the second DC-AC converter 25 is a DC-AC converter with a developable control program embedding function. Since both the second AC-DC converter 23 and the second DC-AC converter 25 have the developable control program embedding function, through the developable control program embedding function, the innovative scientific research results such as the converter optimization control strategy can replace the relevant parts of the original traditional control strategy in the form of a dynamic link library, etc. On the one hand, the dynamic model verification work of the new control strategy can be carried out in combination with the test scenario provided by the wind turbine simulation system. On the other hand, on the basis of the dynamic model verification, combined with the actual operation of the wind turbine, the operation verification work of the new control strategy can be carried out.

[0031] It should be noted that the direct-drive wind power generation system 2 is a physical wind power generation system, and its specific implementation is not limited to Figure 1 A special example of the direct-drive wind power generation system 2 disclosed in .

[0032] In addition, the present embodiment also provides an application method of the aforementioned dynamic model-physical integrated small and medium-sized direct-drive wind turbine generator set, including: when it is necessary to verify the target wind turbine generator set strategy, control the wind turbine 1 to completely retract the blades, and dynamically simulate the wind turbine 1 by controlling the wind turbine dynamic simulation system 3 to drive the direct-drive wind power generation system 2 that operates the target wind turbine generator set strategy, so as to obtain the test results of the direct-drive wind power generation system 2 that operates the target wind turbine generator set strategy under different working conditions; control the wind turbine 1 to completely retract the blades, that is, exit the physical wind power generation system operation mode, at which time the permanent magnet generator 21 and the energy conversion system (the second AC-DC converter 23, the second The other parts such as the DC-AC converter 25) remain in operation, and the wind turbine dynamic simulation system 3 is started, that is, the motor side contactor 36 and the mains side contactor 37 are closed, and the energy conversion system (the first AC-DC converter 32, the first DC-AC converter 33) is put into operation. By controlling the AC side current of the first AC-DC converter 32 of the wind turbine dynamic simulation system 3 (that is, the stator current of the AC motor), the rotor speed of the AC motor 31 can be effectively controlled to achieve the purpose of simulating the operating characteristics of the wind turbine, and provide the operating conditions required for the verification of scientific research results according to the test requirements, and carry out dynamic model verification of scientific research results. After completion, it is necessary to exit the wind turbine dynamic simulation system 3, that is, the energy conversion system (the first AC-DC converter 32, the first DC-AC converter 33) exits operation, and disconnect the motor side contactor 36 and the mains side contactor 37. In addition, when power generation is required, the wind turbine 1 is controlled to release the blades. By default, the wind turbine 1 drives only the direct-drive wind power generation system 2 to generate electricity, and only when the wind speed exceeds the set value, the wind turbine dynamic simulation system 3 is controlled to switch to the power generation mode, and the wind turbine 1 drives the direct-drive wind power generation system 2 and the wind turbine dynamic simulation system 3 to generate electricity at the same time. The wind turbine 1 can be controlled to release the blades as needed to control the blade release state until the blades are completely released, so as to carry out the operation verification of the scientific research results in the physical wind power generation system (direct-drive wind power generation system 2) and the actual power generation work. Since the wind turbine dynamic simulation system 3 is controlled to switch to the power generation mode when the wind speed exceeds the set value, the wind turbine 1 drives the direct-drive wind power generation system 2 and the wind turbine dynamic simulation system 3 to generate electricity at the same time, thereby improving the power generation capacity of the dynamic model-physical integrated small and medium-sized direct-drive wind power generator set.

[0033] Embodiment 2:

[0034] This embodiment is a further improvement on the first embodiment. Figure 2As shown, in this embodiment, based on the first embodiment, a bidirectional DC-DC converter 4 is arranged in parallel between the DC port between the first AC-DC converter 32 and the first DC-AC converter 33 in the wind turbine dynamic simulation system 3, and between the DC port between the second AC-DC converter 23 and the second DC-AC converter 25 in the direct-drive wind power generation system 2.

[0035] The bidirectional DC-DC converter 4 can realize the current conversion between the DC ports of the first AC-DC converter 32 and the first DC-AC converter 33 in the wind turbine dynamic simulation system 3, and the DC ports of the second AC-DC converter 23 and the second DC-AC converter 25 in the direct-drive wind power generation system 2. Starting the bidirectional DC-DC converter 4 can simulate the functions of the energy storage device smoothing wind power fluctuations and responding to wind power primary frequency modulation. The motor side contactor 36 in the wind turbine dynamic simulation system 3 is disconnected, the first AC-DC converter 32 in the wind turbine dynamic simulation system 3 is shut down, and the other parts of the wind turbine dynamic simulation system 3 remain in operation. The bidirectional DC-DC converter 4 is started, and the physical wind power generation system operation mode is started (controlling the wind turbine blades to fully release the blades), so as to carry out the operation verification of scientific research results in the physical wind power generation system.

[0036] The fully controlled switch device of the bidirectional DC-DC converter 4 may be one of an insulated gate bipolar power tube IGBT, an electron injection enhanced gate transistor IEGT, an integrated gate commutated thyristor IGCT and a turn-off thyristor GTO.

[0037] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An application method of a dynamic model-physical integrated small and medium-sized direct-driven wind turbine generator set, the dynamic model-physical integrated small and medium-sized direct-driven wind turbine generator set comprising a wind turbine (1) and a direct-driven wind power generation system (2), the main shaft of the wind turbine (1) being drivingly connected to the direct-driven wind power generation system (2), characterized in that: The dynamic model-physical integrated small and medium-sized direct-driven wind power generator set also includes a wind turbine dynamic simulation system (3), the wind turbine dynamic simulation system (3) includes an AC motor (31), a first AC-DC converter (32), a first DC-AC converter (33) and a first isolation transformer (34), the AC motor (31) is connected to the main shaft of the direct-driven wind power generation system (2) in a transmission manner, the output end of the AC motor (31) is connected to the first AC-DC converter (32), the first DC-AC converter (33) and the first isolation transformer (34) in sequence, the direct-driven wind power generation system (2) includes a permanent magnet generator (21), a generator side contactor (22), a second AC-DC converter (23) ), a second DC capacitor (24), a second DC-AC converter (25), a busbar-side reactor (26), a busbar-side contactor (27) and a second isolation transformer (28), the permanent magnet generator (21) being connected to the main shaft of the wind turbine (1) through a transmission, the output end of the permanent magnet generator (21) being connected in sequence through a generator-side contactor (22), a second AC-DC converter (23), a second DC-AC converter (25), a busbar-side reactor (26), a busbar-side contactor (27) and a second isolation transformer (28), the second DC capacitor (24) being arranged in parallel between the DC-side buses of the second AC-DC converter (23) and the second DC-AC converter (25); A bidirectional DC-DC converter (4) is arranged in parallel between the DC port between the first AC-DC converter (32) and the first DC-AC converter (33) in the wind turbine dynamic simulation system (3) and the DC port between the second AC-DC converter (23) and the second DC-AC converter (25) in the direct-drive wind power generation system (2); The application method of the dynamic model-physical integrated small and medium-sized direct-drive wind turbine generator set comprises: when it is necessary to verify the target wind turbine generator set strategy, controlling the wind turbine (1) to completely retract the blades, and controlling the wind turbine dynamic simulation system (3) to dynamically simulate the wind turbine (1) to drive the direct-drive wind power generation system (2) running the target wind turbine generator set strategy, so as to obtain the test results of the direct-drive wind power generation system (2) running the target wind turbine generator set strategy under different working conditions; when it is necessary to perform power generation operation, controlling the wind turbine (1) to release the blades, and by default, the wind turbine (1) only drives the direct-drive wind power generation system (2) to generate electricity, and only when the wind speed exceeds a set value, controlling the wind turbine dynamic simulation system (3) to switch to a power generation mode, and driving the direct-drive wind power generation system (2) and the wind turbine dynamic simulation system (3) to generate electricity through the wind turbine (1) at the same time.

2. The application method of the dynamic model-physical integrated small and medium-sized direct-drive wind turbine generator set according to claim 1 is characterized in that: The wind turbine dynamic simulation system (3) further comprises a first DC capacitor (35), wherein the first DC capacitor (35) is arranged in parallel between the DC side buses of the first AC-DC converter (32) and the first DC-AC converter (33).

3. The application method of the dynamic model-physical integrated small and medium-sized direct-drive wind turbine generator set according to claim 2 is characterized in that: The wind turbine dynamic simulation system (3) further comprises a motor side contactor (36), wherein the motor side contactor (36) is arranged in series between the AC motor (31) and the AC side of the first AC-DC converter (32).

4. The application method of the dynamic model-physical object integrated small and medium-sized direct-drive wind turbine generator set according to claim 3 is characterized in that: The wind turbine dynamic simulation system (3) further comprises a mains-side contactor (37), wherein the mains-side contactor (37) is arranged in series between the AC side of the first DC-AC converter (33) and the first isolation transformer (34).

5. The application method of the dynamic model-physical object integrated small and medium-sized direct-drive wind turbine generator set according to claim 4 is characterized in that: The wind turbine dynamic simulation system (3) further comprises a mains-side reactor (38), wherein the mains-side reactor (38) is arranged in series between the AC side of the first DC-AC converter (33) and the mains-side contactor (37).

6. The application method of the dynamic model-physical object integrated small and medium-sized direct-drive wind turbine generator set according to claim 5 is characterized in that: The fully controlled switch device of the first AC-DC converter (32) and the first DC-AC converter (33) is one of an insulated gate bipolar power tube IGBT, an electron injection enhanced gate transistor IEGT, an integrated gate commutated thyristor IGCT and a turn-off thyristor GTO; the fully controlled switch device of the second AC-DC converter (23) and the second DC-AC converter (25) is one of an insulated gate bipolar power tube IGBT, an electron injection enhanced gate transistor IEGT, an integrated gate commutated thyristor IGCT and a turn-off thyristor GTO.

7. The application method of the dynamic model-physical object integrated small and medium-sized direct-drive wind turbine generator set according to claim 6 is characterized in that: The second AC-DC converter (23) is an AC-DC converter with a function of embedding a control program that can be developed, and the second DC-AC converter (25) is a DC-AC converter with a function of embedding a control program that can be developed.

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