Multi-winding distributed wind power converter

Abstract

The invention provides a multi-winding distributed wind power converter. The wind power converter comprises a machine side filtering assembly module, a rectifier module, an inverter module and a network side filtering assembly module, the input end of the machine side filtering assembly module is connected with the output end of a fan, and the output end of the machine side filtering assembly module is connected with the input end of the rectifier module; the output end of the rectifier module is connected with the input end of the inverter module; the output end of the inverter module is connected with the input end of the network side filtering assembly module; and the output end of the grid-side filtering assembly module is connected with the input end of the power grid. According to the technical scheme, the output power of the draught fan is improved, when one assembly is cut off due to faults, the draught fan keeps grid-connected operation in a power reduction mode, and the redundancy function is achieved.

Description

Technical Field

[0001] The present application relates to the field of wind power generation, and in particular to a multi-winding distributed wind power converter. Background Art

[0002] In recent decades, the research and application of modern wind power generation systems have been mainly based on low-voltage wind turbines. In recent years, with the explosive growth of large-scale wind farm grid-connected capacity, the single-unit capacity of wind turbines has also been increasing, approaching the ten-megawatt level. At the same time, the single-tube capacity of IGBT, a commercialized power electronic active device in the field of low-voltage wind turbine converters, is limited and cannot meet the needs of rapid growth, resulting in low grid-connected power of wind power generation systems. Therefore, it is urgent to propose a solution that can increase the grid-connected power of wind power generation systems. Summary of the invention

[0003] The present application provides a multi-winding distributed wind power converter to at least solve the technical problem of low grid-connected power of a wind power generation system.

[0004] The first embodiment of the present application provides a multi-winding distributed wind power converter, the wind power converter comprising: a machine-side filter component module, a rectifier module, an inverter module, and a grid-side filter component module;

[0005] The input end of the machine-side filter component module is connected to the output end of the fan, and the output end of the machine-side filter component module is connected to the input end of the rectifier module;

[0006] The output end of the rectifier module is connected to the input end of the inverter module;

[0007] The output end of the inverter module is connected to the input end of the grid-side filter component module;

[0008] The output end of the grid-side filter component module is connected to the input end of the power grid.

[0009] Preferably, the machine-side filter component module is used to filter the electric energy output by the fan;

[0010] The rectifier module is used to convert the filtered electric energy into direct current electric energy;

[0011] The inverter module is used to convert the DC power into AC power;

[0012] The grid-side filtering component module is used to filter the electric energy input into the grid.

[0013] Furthermore, the machine-side filter component module includes: N first filter components.

[0014] Furthermore, the rectifier module includes: N rectifiers.

[0015] Furthermore, the inverter module includes: N inverters.

[0016] Furthermore, the grid-side filtering component module includes: N second filtering components.

[0017] Furthermore, the N first filter components, the N rectifiers, the N inverters, and the N second filter components are respectively connected to form N series circuits, and the N series circuits are connected in parallel.

[0018] Furthermore, the series circuit includes: a first filter component, a rectifier, an inverter, and a second filter component;

[0019] The output end of the first filter component is connected to the input end of the rectifier;

[0020] The output end of the rectifier is connected to the input end of the inverter;

[0021] The output end of the inverter is connected to the input end of the second filter component.

[0022] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0023] The present application proposes a multi-winding distributed wind power converter, which includes: a machine-side filter component module, a rectifier module, an inverter module, and a grid-side filter component module; the input end of the machine-side filter component module is connected to the output end of the wind turbine, and the output end of the machine-side filter component module is connected to the input end of the rectifier module; the output end of the rectifier module is connected to the input end of the inverter module; the output end of the inverter module is connected to the input end of the grid-side filter component module; the output end of the grid-side filter component module is connected to the input end of the power grid. The technical solution proposed in the present application realizes the improvement of the output power of the wind turbine. When a component is removed due to a fault, the wind turbine maintains grid-connected operation by reducing power, and has a redundant function.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0026] Figure 1A first structural diagram of a multi-winding distributed wind power converter provided according to an embodiment of the present application;

[0027] Figure 2 A second structural diagram of a multi-winding distributed wind power converter provided according to an embodiment of the present application;

[0028] Figure 3 A structural diagram of a wind turbine and a power grid connected to a multi-winding distributed wind power converter provided according to an embodiment of the present application;

[0029] Reference numerals

[0030] Machine-side filter component module 1, rectifier module 2, inverter module 3, grid-side filter component module 4, first filter component 1-1, rectifier 2-1, inverter 3-1, second filter component 4-1, wind turbine 101 and grid 106. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0032] The present application proposes a multi-winding distributed wind power converter, which includes: a machine-side filter component module, a rectifier module, an inverter module, and a grid-side filter component module; the input end of the machine-side filter component module is connected to the output end of the wind turbine, and the output end of the machine-side filter component module is connected to the input end of the rectifier module; the output end of the rectifier module is connected to the input end of the inverter module; the output end of the inverter module is connected to the input end of the grid-side filter component module; the output end of the grid-side filter component module is connected to the input end of the power grid. The technical solution proposed in the present application realizes the improvement of the output power of the wind turbine. When a component is removed due to a fault, the wind turbine maintains grid-connected operation by reducing power, and has a redundant function.

[0033] A multi-winding distributed wind power converter according to an embodiment of the present application is described below with reference to the accompanying drawings.

[0034] Embodiment 1

[0035] Figure 1 A flowchart of a multi-winding distributed wind power converter provided according to an embodiment of the present application is shown in FIG. Figure 1 As shown, the wind power converter includes: a machine-side filter component module 1, a rectifier module 2, an inverter module 3, and a grid-side filter component module 4;

[0036] The input end of the machine-side filter component module 1 is connected to the output end of the fan, and the output end of the machine-side filter component module 1 is connected to the input end of the rectifier module 2;

[0037] The output end of the rectifier module 2 is connected to the input end of the inverter module 3;

[0038] The output end of the inverter module 3 is connected to the input end of the grid-side filter component module 4;

[0039] The output end of the grid-side filter component module 4 is connected to the input end of the grid.

[0040] It should be noted that the machine-side filter component module 1 is used to filter the electric energy output by the wind turbine, such as filtering the machine-side voltage and current to improve the waveform quality.

[0041] The rectifier module 2 is used to convert the filtered electric energy into direct current electric energy, such as converting the machine-side alternating current into direct current, so as to facilitate the subsequent electric energy conversion of the inverter module 3 .

[0042] The inverter module 3 is used to convert the DC power into AC power, such as converting DC power into AC power that is fed into the power grid;

[0043] The grid-side filter component module 4 is used to filter the electric energy input into the grid, such as filtering the grid-side voltage and current to improve the grid-connected waveform quality.

[0044] In the embodiments of the present disclosure, Figure 2 As shown, the machine-side filter component module 1 includes: N first filter components 1-1;

[0045] The rectifier module 2 includes: N rectifiers 2-1;

[0046] The inverter module 3 includes: N inverters 3-1;

[0047] The grid-side filtering component module 4 includes: N second filtering components 4 - 1 .

[0048] It should be noted that if Figure 2 As shown, the N first filter components 1-1, the N rectifiers 2-1, the N inverters 3-1, and the N second filter components 4-1 are respectively connected to form N series circuits, and the N series circuits are connected in parallel.

[0049] The series circuit includes: a first filter component 1-1, a rectifier 2-1, an inverter 3-1, and a second filter component 4-1;

[0050] The output end of the first filter component 1-1 is connected to the input end of the rectifier 2-1;

[0051] The output end of the rectifier 2-1 is connected to the input end of the inverter 3-1;

[0052] The output end of the inverter 3 - 1 is connected to the input end of the second filter component 4 - 1 .

[0053] For example, Figure 3 The figure shows a schematic diagram of the connection between a multi-winding distributed wind power converter and a wind turbine 101 and a power grid 106 when N is equal to 3. The machine-side filter component module 1, the rectifier module 2, the inverter module 3, and the grid-side filter component module 4 are all composed of three completely identical components, and the power passing through the three components is the same. Therefore, the proposed multi-winding distributed wind power converter achieves an increase in the output power of the wind turbine. When a component is removed due to a fault, the wind turbine maintains grid-connected operation by reducing power, so it has a redundant function.

[0054] It should be noted that the multi-winding distributed wind power converter provided in this embodiment has the following advantages:

[0055] 1. The output power of the wind turbine is increased by using multiple distributed small-power converters, i.e. multiple series circuits; 2. The reliability problems such as voltage and current equalization caused by series and parallel connection of power semiconductor devices are avoided; 3. When the converter fails, the wind turbine can remain connected to the grid and thus has redundancy function.

[0056] In summary, the multi-winding distributed wind power converter proposed in this embodiment improves the output power of the wind turbine. When a component is removed due to a fault, the wind turbine maintains grid-connected operation by reducing power, and has a redundancy function.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0058] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0059] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A multi-winding distributed wind power converter, characterized in that: The wind power converter comprises: a machine-side filter component module, a rectifier module, an inverter module, and a grid-side filter component module; The input end of the machine-side filter component module is connected to the output end of the fan, and the output end of the machine-side filter component module is connected to the input end of the rectifier module; The output end of the rectifier module is connected to the input end of the inverter module; The output end of the inverter module is connected to the input end of the grid-side filter component module; The output end of the grid-side filter component module is connected to the input end of the power grid.

2. The wind power converter according to claim 1, characterized in that: The machine-side filter component module is used to filter the electric energy output by the fan; The rectifier module is used to convert the filtered electric energy into direct current electric energy; The inverter module is used to convert the DC power into AC power; The grid-side filtering component module is used to filter the electric energy input into the grid.

3. The wind power converter according to claim 2, characterized in that: The machine-side filter component module includes: N first filter components.

4. The wind power converter according to claim 3, characterized in that: The rectifier module includes: N rectifiers.

5. The wind power converter according to claim 4, characterized in that: The inverter module includes: N inverters.

6. The wind power converter according to claim 5, characterized in that: The network-side filtering component module includes: N second filtering components.

7. The wind power converter according to claim 6, characterized in that: The N first filter components, the N rectifiers, the N inverters, and the N second filter components are respectively connected to form N series circuits, and the N series circuits are connected in parallel.

8. The wind power converter according to claim 7, characterized in that: The series circuit includes: a first filter component, a rectifier, an inverter, and a second filter component; The output end of the first filter component is connected to the input end of the rectifier; The output end of the rectifier is connected to the input end of the inverter; The output end of the inverter is connected to the input end of the second filter component.

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