Wind power plant energy output system

Abstract

The invention provides an energy output system of a wind power plant. The system comprises a plurality of fans, a fan energy direct-current collection module, a high-voltage direct-current output and inversion module and an alternating-current parallel transformer, the output ends of the plurality of fans are connected with the input end of the fan energy direct current collection module; the output end of the fan energy direct current collection module is connected with the input end of the high-voltage direct current output and inversion module; the output end of the high-voltage direct-current output and inversion module is connected with the input end of the alternating-current shunt transformer; the output end of the alternating-current parallel transformer is connected with a power grid, and energy output of the wind power plant is achieved. According to the technical scheme, the collected voltage level is improved, the purpose of high-voltage direct-current transmission of wind power energy is achieved, maintenance is convenient, and cost is low.

Description

Technical Field

[0001] The present application relates to the field of wind farm energy transmission, and in particular to a wind farm energy output system. Background Art

[0002] At present, the development of offshore wind farms has evolved from small capacity and short distance to large capacity and offshore. How to efficiently collect and transmit wind turbine energy through the power conversion system is a key issue. The AC transmission of offshore wind power has charging current and requires the addition of reactive power compensation equipment, which increases the difficulty of maintenance and construction cost. Therefore, it is urgent to propose a wind farm energy output system that is simple to maintain and low in cost. Summary of the invention

[0003] The present application provides a wind farm energy output system to at least solve the technical problems of difficult maintenance and high construction cost.

[0004] The first embodiment of the present application provides a wind farm energy output system, the system comprising: a plurality of wind turbines, a wind turbine energy DC collection module, a high-voltage DC output and inverter module, and an AC parallel transformer;

[0005] The output ends of the plurality of fans are connected to the input end of the fan energy DC collection module;

[0006] The output end of the wind turbine energy DC collection module is connected to the input end of the high voltage DC output and inverter module;

[0007] The output end of the high voltage DC output and inverter module is connected to the input end of the AC parallel transformer;

[0008] The output end of the AC parallel transformer is connected to the power grid to achieve the output of wind farm energy.

[0009] Preferably, the fan energy DC collection module comprises: a plurality of rectifiers;

[0010] The plurality of rectifiers are connected in series.

[0011] Further, the high voltage DC output and inverter module comprises: a plurality of inverters;

[0012] The DC terminals of the plurality of inverters are connected in series.

[0013] Furthermore, the number of the multiple wind turbines, the multiple rectifiers, and the multiple inverters is N.

[0014] Furthermore, the multiple fans are connected to the multiple rectifiers in a one-to-one correspondence.

[0015] Furthermore, the wind turbine energy DC collection module is used to connect the electric energy generated by multiple wind turbines in series to generate high-voltage DC electric energy;

[0016] The high-voltage direct current output and inverter module is used to invert the high-voltage direct current electric energy into high-voltage alternating current electric energy and transmit it to the alternating current parallel transformer.

[0017] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0018] The present application proposes a wind farm energy output system, the system includes: multiple wind turbines, a wind turbine energy DC collection module, a high-voltage DC output and inverter module, and an AC parallel transformer; the output ends of the multiple wind turbines are connected to the input end of the wind turbine energy DC collection module; the output end of the wind turbine energy DC collection module is connected to the input end of the high-voltage DC output and inverter module; the output end of the high-voltage DC output and inverter module is connected to the input end of the AC parallel transformer; the output end of the AC parallel transformer is connected to the power grid to achieve the output of wind farm energy. The technical solution proposed in the present application improves the voltage level of the collection, achieves the purpose of high-voltage DC transmission of wind power energy, and is easy to maintain and low in cost.

[0019] 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

[0020] 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:

[0021] Figure 1 A structural diagram of a wind farm energy output system provided according to an embodiment of the present application;

[0022] Reference numerals

[0023] Wind turbine 101, wind turbine energy DC collection module 102, high voltage DC output and inverter module 103, AC parallel transformer 104, power grid 105, rectifier 1, inverter 2. DETAILED DESCRIPTION

[0024] 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.

[0025] The present application proposes a wind farm energy output system, the system includes: multiple wind turbines, a wind turbine energy DC collection module, a high-voltage DC output and inverter module, and an AC parallel transformer; the output ends of the multiple wind turbines are connected to the input end of the wind turbine energy DC collection module; the output end of the wind turbine energy DC collection module is connected to the input end of the high-voltage DC output and inverter module; the output end of the high-voltage DC output and inverter module is connected to the input end of the AC parallel transformer; the output end of the AC parallel transformer is connected to the power grid to achieve the output of wind farm energy. The technical solution proposed in the present application improves the voltage level of the collection, achieves the purpose of high-voltage DC transmission of wind power energy, and is easy to maintain and low in cost.

[0026] A wind farm energy output system according to an embodiment of the present application is described below with reference to the accompanying drawings.

[0027] Embodiment 1

[0028] Figure 1 A structural diagram of a wind farm energy output system provided according to an embodiment of the present application is shown in FIG. Figure 1 As shown, the system includes: a plurality of wind turbines 101, a wind turbine energy DC collection module 102, a high-voltage DC output and inverter module 103, and an AC parallel transformer 104;

[0029] The output ends of the plurality of wind turbines 101 are connected to the input end of the wind turbine energy DC collection module 102;

[0030] The output end of the wind turbine energy DC collection module 102 is connected to the input end of the high voltage DC output and inverter module 103;

[0031] The output end of the high voltage DC output and inverter module 103 is connected to the input end of the AC parallel transformer 104;

[0032] The output end of the AC parallel transformer 104 is connected to the power grid 105 to achieve the output of wind farm energy.

[0033] It should be noted that the wind turbine energy DC collection module 102 is used to connect the electric energy generated by multiple wind turbines in series to generate high-voltage DC electric energy;

[0034] The high-voltage direct current output and inversion module 103 is used to invert the high-voltage direct current electric energy into high-voltage alternating current electric energy and transmit it to the alternating current parallel transformer 104 .

[0035] In the embodiments of the present disclosure, Figure 1 As shown, the wind turbine energy DC collection module 102 includes: a plurality of rectifiers 1;

[0036] The plurality of rectifiers 1 are connected in series.

[0037] It should be noted that the multiple fans 101 are connected to the multiple rectifiers 1 in a one-to-one correspondence. Figure 1 shown.

[0038] In the embodiments of the present disclosure, Figure 1 As shown, the high voltage DC output and inversion module 103 comprises: a plurality of inverters 2;

[0039] The DC terminals of the plurality of inverters 2 are connected in series.

[0040] It should be noted that the number of the plurality of wind turbines 101 , the plurality of rectifiers 1 , and the plurality of inverters 2 is N.

[0041] In the disclosed embodiment, the electric energy generated by multiple wind turbines 101 is rectified into direct current through multiple rectifiers 1 in the wind turbine energy direct current collector 102. The output direct current of the multiple rectifiers 1 is boosted in series to become high-voltage direct current. The high-voltage direct current is transmitted to the onshore inverter station through the high-voltage direct current output and inversion 103, and is inverted into alternating current through multiple inverters 2. The alternating current outputs of the multiple inverters 2 are connected to the grid through the alternating current parallel transformer 104, thereby achieving the purpose of high-voltage direct current transmission of wind power energy.

[0042] The wind farm energy output system proposed in this embodiment has the following advantages:

[0043] 1. Without increasing costs, the existing wind turbine side wind power converter is used to realize the high-voltage direct current collection of wind turbine energy;

[0044] 2. High-voltage DC energy transmission is achieved through the series boost operation of the machine-side wind turbine converter.

[0045] In summary, the wind farm energy output system proposed in this embodiment improves the collected voltage level and achieves the purpose of high-voltage direct current transmission of wind power energy.

[0046] 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.

[0047] 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.

[0048] 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 wind farm energy output system, characterized in that: The system includes: a plurality of fans, a fan energy DC collection module, a high-voltage DC output and inverter module, and an AC parallel transformer; The output ends of the plurality of fans are connected to the input end of the fan energy DC collection module; The output end of the wind turbine energy DC collection module is connected to the input end of the high voltage DC output and inverter module; The output end of the high voltage DC output and inverter module is connected to the input end of the AC parallel transformer; The output end of the AC parallel transformer is connected to the power grid to achieve the output of wind farm energy.

2. The wind farm energy output system according to claim 1, characterized in that: The fan energy DC collection module includes: a plurality of rectifiers; The plurality of rectifiers are connected in series.

3. The wind farm energy output system according to claim 2, characterized in that: The high-voltage direct current output and inverter module includes: a plurality of inverters; The DC terminals of the plurality of inverters are connected in series.

4. The wind farm energy output system according to claim 3, characterized in that: The number of the plurality of wind turbines, the plurality of rectifiers and the plurality of inverters is N.

5. The wind farm energy output system according to claim 4, characterized in that: The multiple fans are connected to the multiple rectifiers in a one-to-one correspondence.

6. The wind farm energy output system according to claim 5, characterized in that: The wind turbine energy DC collection module is used to connect the electric energy generated by multiple wind turbines in series to generate high-voltage DC electric energy; The high-voltage direct current output and inverter module is used to invert the high-voltage direct current electric energy into high-voltage alternating current electric energy and transmit it to the alternating current parallel transformer.

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