Converter structure suitable for double-machine-head wind generating set
By replacing the traditional scheme with a converter structure and a dual-winding transformer, the high cost of dual-head wind turbine generators has been solved, achieving cost reduction and simplified control.
Patent Information
- Application Number
- CN202520110725.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-01-16
AI Technical Summary
Twin-head wind turbine generator sets require two sets of converters and transformers, which greatly increases the cost of the unit.
Two generators are connected by a single converter structure, and independent control is achieved through a nine-switch converter on the generator side and a DC circuit. A dual-winding transformer is used instead of a traditional three-winding transformer.
It effectively reduces the cost of converters and transformers, simplifies control, and lowers the construction cost of wind turbine generator sets.
Smart Images
Figure CN223798134U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of wind power generation, and in particular to a converter structure suitable for dual-head wind turbine generator sets. Background Technology
[0002] With the vigorous development of wind power technology in my country in recent years, my country's offshore wind power has gradually shifted from coastal areas to mid- and far-sea areas. In order to save on the cost per kilowatt-hour, the single unit capacity is getting larger and larger. Dual-head wind turbine generators have two generator systems, which can effectively increase the single unit capacity. However, dual-head wind turbine generators require two sets of converters and transformers, which greatly increases the cost of the unit. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a converter structure suitable for dual-head wind turbine generator sets, which can effectively reduce the construction cost of wind turbine generator sets.
[0004] The objective of this utility model can be achieved by adopting the following technical solutions:
[0005] A converter structure suitable for a dual-head wind turbine generator set includes two generators, namely a first generator and a second generator. The converter structure includes a first generator-side filter, a second generator-side filter, a generator-side nine-switch converter, a DC circuit, a grid-side converter, and a grid-side filter. The input terminal of the first generator-side filter is electrically connected to the first generator, and its output terminal is electrically connected to the input terminal of the upper arm of the generator-side nine-switch converter. The input terminal of the second generator-side filter is electrically connected to the second generator, and its output terminal is electrically connected to the input terminal of the lower arm of the generator-side nine-switch converter. The input terminal of the DC circuit is electrically connected to the output terminal of the generator-side nine-switch converter, and the output terminal of the DC circuit is electrically connected to the input terminal of the grid-side converter. The output terminal of the grid-side converter is electrically connected to the input terminal of the grid-side filter, and the output terminal of the grid-side filter is connected to the power grid through a transformer.
[0006] Furthermore, the machine-side nine-switch converter includes converters M1, M2, M3, M4, M5, M6, M7, M8, and M9. The collector of converter M4 is electrically connected to the emitter of converter M1, forming the upper bridge arm input terminal of phase A of the machine-side nine-switch converter. The collector of converter M7 is electrically connected to the emitter of converter M4, forming the lower bridge arm input terminal of phase A of the machine-side nine-switch converter. The collector of converter M5 is electrically connected to the emitter of converter M2, forming the upper bridge arm input terminal of phase B of the machine-side nine-switch converter. The converter M8... The collector of converter M6 is electrically connected to the emitter of converter M5, forming the lower bridge arm input terminal of phase B of the machine-side nine-switch converter. The collector of converter M6 is electrically connected to the emitter of converter M3, forming the upper bridge arm input terminal of phase C of the machine-side nine-switch converter. The collector of converter M9 is electrically connected to the emitter of converter M6, forming the lower bridge arm input terminal of phase C of the machine-side nine-switch converter. The collectors of converters M1, M2, and M3 are electrically connected, forming the positive output terminal of the machine-side nine-switch converter. The emitters of converters M7, M8, and M9 are electrically connected, forming the negative output terminal of the machine-side nine-switch converter.
[0007] Furthermore, the DC circuit includes a DC-side capacitor, a chopper switch, and a resistor. The collector of the chopper switch is electrically connected to one end of the DC-side capacitor, and its emitter is electrically connected to the other end of the DC-side capacitor through the resistor. One end of the DC-side capacitor is connected to the positive output terminal of the machine-side nine-switch converter and the positive input terminal of the grid-side converter, respectively, and its other end is electrically connected to the negative output terminal of the machine-side nine-switch converter and the negative input terminal of the grid-side converter, respectively.
[0008] Furthermore, the grid-side converter includes converter G1, converter G2, converter G3, converter G4, converter G5, and converter G6. The collectors of converters G1, G2, and G3 are electrically connected to form the positive input terminal of the grid-side converter. The emitters of converters G4, G5, and G6 are electrically connected to form the negative input terminal of the grid-side converter. The collector of converter G4 and the emitter of converter G1 are electrically connected to form the output terminal of phase A of the grid-side converter. The collector of converter G5 and the emitter of converter G2 are electrically connected to form the output terminal of phase B of the grid-side converter. The collector of converter G6 and the emitter of converter G3 are electrically connected to form the output terminal of phase C of the grid-side converter.
[0009] Furthermore, the input terminal of the grid-side filter is electrically connected to the output terminals of phases A, B, and C of the grid-side converter, respectively, and its output terminal is electrically connected to the transformer.
[0010] Furthermore, the transformer is a two-winding transformer.
[0011] Compared with the prior art, this utility model has the following advantages and beneficial effects:
[0012] 1. This utility model uses one converter to connect two generators and control them independently. Compared with the two converter scheme, it can effectively reduce the converter cost, simplify the converter control, and reduce the construction cost of wind turbine generator sets.
[0013] 2. By adopting the converter structure of this utility model, one transformer winding can be reduced, thereby reducing transformer costs and further reducing the construction cost of wind turbine generator sets. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation
[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.
[0016] like Figure 1 As shown, this embodiment provides a converter structure suitable for a dual-head wind turbine generator set. The dual-head wind turbine generator set includes two generators, namely a first generator 9 and a second generator 10. The converter structure includes a first generator-side filter 1, a second generator-side filter 2, a generator-side nine-switch converter 3, a DC circuit 4, a grid-side converter 5, and a grid-side filter 6. The input terminal of the first generator-side filter 1 is electrically connected to the first generator, and its output terminal is electrically connected to the input terminal of the upper arm of the generator-side nine-switch converter 3. The input terminal of the second generator-side filter 2 is electrically connected to the second generator, and its output terminal is electrically connected to the input terminal of the lower arm of the generator-side nine-switch converter 3. The input terminal of the DC circuit 4 is electrically connected to the output terminal of the generator-side nine-switch converter 3, and the output terminal of the DC circuit 4 is electrically connected to the input terminal of the grid-side converter 5. The output terminal of the grid-side converter 5 is electrically connected to the input terminal of the grid-side filter 6. The output terminal of the grid-side filter 6 is connected to the power grid 8 through a transformer 7, which is a two-winding transformer.
[0017] The machine-side nine-switch converter 3 includes converters M1, M2, M3, M4, M5, M6, M7, M8, and M9. The collector of converter M4 is electrically connected to the emitter of converter M1, forming the upper bridge arm input terminal of phase A of the machine-side nine-switch converter 3. The collector of converter M7 is electrically connected to the emitter of converter M4, forming the lower bridge arm input terminal of phase A of the machine-side nine-switch converter 3. The collector of converter M5 is electrically connected to the emitter of converter M2, forming the upper bridge arm input terminal of phase B of the machine-side nine-switch converter 3. The collector of converter M8 and... The emitter of converter M5 is electrically connected to form the lower bridge arm input terminal of phase B of the machine-side nine-switch converter 3. The collector of converter M6 and the emitter of converter M3 are electrically connected to form the upper bridge arm input terminal of phase C of the machine-side nine-switch converter 3. The collector of converter M9 and the emitter of converter M6 are electrically connected to form the lower bridge arm input terminal of phase C of the machine-side nine-switch converter 3. The collectors of converters M1, M2 and M3 are electrically connected to form the positive output terminal of the machine-side nine-switch converter 3. The emitters of converters M7, M8 and M9 are electrically connected to form the negative output terminal of the machine-side nine-switch converter 3.
[0018] DC circuit 4 includes a DC-side capacitor, a chopper switch, and a resistor. The collector of the chopper switch is electrically connected to one end of the DC-side capacitor, and its emitter is electrically connected to the other end of the DC-side capacitor through the resistor. One end of the DC-side capacitor is connected to the positive output terminal of the machine-side nine-switch converter 3 and the positive input terminal of the grid-side converter 5, respectively. The other end is electrically connected to the negative output terminal of the machine-side nine-switch converter 3 and the negative input terminal of the grid-side converter 5, respectively.
[0019] The grid-side converter 5 includes converters G1, G2, G3, G4, G5, and G6. The collectors of converters G1, G2, and G3 are electrically connected to form the positive input terminal of the grid-side converter 5. The emitters of converters G4, G5, and G6 are electrically connected to form the negative input terminal of the grid-side converter 5. The collector of converter G4 and the emitter of converter G1 are electrically connected to form the output terminal of phase A of the grid-side converter 5. The collector of converter G5 and the emitter of converter G2 are electrically connected to form the output terminal of phase B of the grid-side converter 5. The collector of converter G6 and the emitter of converter G3 are electrically connected to form the output terminal of phase C of the grid-side converter 5.
[0020] The input terminal of the grid-side filter 6 is electrically connected to the output terminals of phases A, B, and C of the grid-side converter 5, respectively, and its output terminal is electrically connected to the transformer.
[0021] This utility model uses a nine-switch converter on the generator side to replace the traditional generator side converter. The nine-switch converter on the generator side can connect two generators at the same time and control them separately. The converter device can be simplified from two sets to one set, and the transformer structure can be changed from a three-winding transformer to a traditional two-winding transformer, which appropriately reduces the cost of converters and transformers and greatly reduces the construction cost of wind turbine generator sets.
[0022] The above description is only a preferred embodiment of this utility model patent, but the protection scope of this utility model patent is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed in this utility model patent, based on the technical solution and utility model patent concept of this utility model patent, shall fall within the protection scope of this utility model patent.
Claims
1. A converter structure suitable for a double head wind turbine generator unit, the double head wind turbine generator unit comprising two generators, a first generator and a second generator, respectively; characterized in that: The converter structure comprises a first machine-side filter, a second machine-side filter, a machine-side nine-switch converter, a DC circuit, a grid-side converter and a grid-side filter, an input end of the first machine-side filter is electrically connected with a first generator, an output end thereof is electrically connected with an input end of an upper bridge arm of the machine-side nine-switch converter, an input end of the second machine-side filter is electrically connected with a second generator, an output end thereof is electrically connected with an input end of a lower bridge arm of the machine-side nine-switch converter, an input end of the DC circuit is electrically connected with an output end of the machine-side nine-switch converter, an output end of the DC circuit is electrically connected with an input end of the grid-side converter, an output end of the grid-side converter is electrically connected with an input end of the grid-side filter, and an output end of the grid-side filter is connected to a power grid through a transformer.
2. The converter structure suitable for a dual head wind turbine generator set according to claim 1, characterized in that: The machine-side nine-switch converter comprises a converter M1, a converter M2, a converter M3, a converter M4, a converter M5, a converter M6, a converter M7, a converter M8 and a converter M9, a collector of the converter M4 and an emitter of the converter M1 are electrically connected, forming an upper bridge arm input end of an A phase of the machine-side nine-switch converter, a collector of the converter M7 and an emitter of the converter M4 are electrically connected, forming a lower bridge arm input end of the A phase of the machine-side nine-switch converter, a collector of the converter M5 and an emitter of the converter M2 are electrically connected, forming an upper bridge arm input end of a B phase of the machine-side nine-switch converter, a collector of the converter M8 and an emitter of the converter M5 are electrically connected, forming a lower bridge arm input end of the B phase of the machine-side nine-switch converter, a collector of the converter M6 and an emitter of the converter M3 are electrically connected, forming an upper bridge arm input end of a C phase of the machine-side nine-switch converter, a collector of the converter M9 and an emitter of the converter M6 are electrically connected, forming a lower bridge arm input end of the C phase of the machine-side nine-switch converter, collectors of the converter M1, the converter M2 and the converter M3 are electrically connected, forming a positive output end of the machine-side nine-switch converter, emitters of the converter M7, the converter M8 and the converter M9 are electrically connected, forming a negative output end of the machine-side nine-switch converter.
3. The converter structure suitable for use in a dual head wind turbine generator set according to claim 1, characterized in that: The DC circuit comprises a DC-side capacitor, a chopper switch and a resistor, a collector of the chopper switch is electrically connected with one end of the DC-side capacitor, an emitter thereof is electrically connected with the other end of the DC-side capacitor through the resistor, and the one end of the DC-side capacitor is respectively connected with the positive output end of the machine-side nine-switch converter and a positive input end of the grid-side converter, and the other end of the DC-side capacitor is respectively electrically connected with the negative output end of the machine-side nine-switch converter and a negative input end of the grid-side converter.
4. The converter structure suitable for use in a dual head wind turbine generator set according to claim 1, characterized in that: The grid-side converter comprises a converter G1, a converter G2, a converter G3, a converter G4, a converter G5 and a converter G6, the collectors of the converter G1, the converter G2 and the converter G3 are electrically connected to form a positive input end of the grid-side converter, the emitters of the converter G4, the converter G5 and the converter G6 are electrically connected to form a negative input end of the grid-side converter, the collector of the converter G4 and the emitter of the converter G1 are electrically connected to form an output end of an A phase of the grid-side converter, the collector of the converter G5 and the emitter of the converter G2 are electrically connected to form an output end of a B phase of the grid-side converter, and the collector of the converter G6 and the emitter of the converter G3 are electrically connected to form an output end of a C phase of the grid-side converter.
5. The converter structure suitable for use in a dual head wind turbine generator set according to claim 1, characterized in that: The input ends of the grid-side filter are electrically connected to the output ends of the A phase, the B phase and the C phase of the grid-side converter respectively, and the output end of the grid-side filter is electrically connected to the transformer.
6. The converter structure suitable for use in a dual head wind turbine generator set according to claim 1, characterized in that: The transformer is a double-winding transformer.