Energy output system based on fan energy high-voltage direct current transmission variable flow

Abstract

The invention provides an energy output system based on fan energy high-voltage direct-current output conversion. The system comprises a plurality of fans, a direct-current collection module, a high-voltage direct-current inversion module and an alternating-current parallel transformer. The output ends of the plurality of fans are connected with the input end of the direct current collection module; the direct current collection module comprises a plurality of rectifiers, and the output ends of the plurality of rectifiers are connected in a series boosting mode to form independent output ends; the high-voltage direct-current inversion module comprises a plurality of inverters, and the input ends of the plurality of inverters are connected in a parallel current rising mode to form independent input ends; the independent output end of the direct current collection module is connected with the independent input end of the high-voltage direct current inversion module; the output end of the high-voltage direct-current 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 to achieve energy output of the wind power plant. According to the scheme provided by the invention, the level of the collected voltage is improved through a series voltage boosting and parallel current boosting mode.

Description

Technical Field

[0001] The present application relates to the field of wind farm energy transmission, and in particular to an energy output system based on high-voltage direct current transmission and conversion of wind turbine energy. Background Art

[0002] At present, the development of offshore wind farms has shifted 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 costs. The voltage level collection is difficult, so there is an urgent need to propose a wind farm energy output solution with simple voltage level collection and low cost. Summary of the invention

[0003] The present application provides an energy output system based on high-voltage direct current transmission conversion of wind turbine energy, so as to at least solve the technical problems of high maintenance difficulty and construction cost, and difficulty in voltage level aggregation.

[0004] The first aspect of the present application provides an energy output system based on high-voltage direct current transmission and conversion of wind turbine energy, the system comprising: a plurality of wind turbines, a direct current collection module, a high-voltage direct current inverter module, and an alternating current parallel transformer;

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

[0006] The DC collection module comprises a plurality of rectifiers, and the output ends of the plurality of rectifiers are connected in series in a boosting manner to form independent output ends;

[0007] The high-voltage direct current inverter module comprises a plurality of inverters, and the input ends of the plurality of inverters are connected in a parallel current-increasing manner to form independent input ends;

[0008] The independent output end of the DC collection module is connected to the independent input end of the high-voltage DC inverter module;

[0009] The output end of the high-voltage DC inverter module is connected to the input end of the AC parallel transformer;

[0010] The output end of the AC parallel transformer is connected to the power grid to achieve the output of wind farm energy.

[0011] Preferably, the independent output terminal of the DC collection module is connected to the independent input terminal of the high-voltage DC inverter module in accordance with positive and negative polarity.

[0012] Furthermore, the number of the multiple wind turbines, the multiple rectifiers, and the multiple inverters is N.

[0013] Furthermore, the multiple fans are connected to the multiple rectifiers in a one-to-one correspondence.

[0014] Furthermore, the DC collection module is used to connect the electric energy generated by multiple wind turbines in series to generate high-voltage DC electric energy;

[0015] The high-voltage direct current 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.

[0016] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0017] The present application proposes an energy output system based on high-voltage direct current transmission and conversion of wind turbine energy, the system comprising: multiple wind turbines, a direct current collection module, a high-voltage direct current inverter module, and an alternating current parallel transformer; the output ends of the multiple wind turbines are connected to the input end of the direct current collection module; the direct current collection module comprises multiple rectifiers, the output ends of the multiple rectifiers are connected in a series boost mode to form an independent output end; the high-voltage direct current inverter module comprises multiple inverters, the input ends of the multiple inverters are connected in a parallel boost mode to form an independent input end; the independent output end of the direct current collection module is connected to the independent input end of the high-voltage direct current inverter module; the output end of the high-voltage direct current inverter module is connected to the input end of the alternating current parallel transformer; the output end of the alternating current parallel transformer is connected to the power grid to realize the output of wind farm energy. The technical solution proposed in the present application improves the voltage level of the collection through the series boost + parallel boost mode, realizes the purpose of high-voltage direct current transmission of wind power energy, and is easy to maintain and low in cost.

[0018] 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

[0019] 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:

[0020] Figure 1 A structural diagram of an energy output system based on high-voltage direct current transmission and conversion of wind turbine energy provided according to an embodiment of the present application;

[0021] Reference numerals

[0022] Wind turbine 101, DC collection module 102, high-voltage DC inverter module 103, AC parallel transformer 104, power grid 105, rectifier 1, inverter 2. DETAILED DESCRIPTION

[0023] 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.

[0024] The present application proposes an energy output system based on high-voltage direct current transmission and conversion of wind turbine energy, the system includes: multiple wind turbines, a direct current collection module, a high-voltage direct current inverter module, and an alternating current parallel transformer; the output ends of the multiple wind turbines are connected to the input end of the direct current collection module; the direct current collection module includes multiple rectifiers, the output ends of the multiple rectifiers are connected in a series boost mode to form an independent output end; the high-voltage direct current inverter module includes multiple inverters, the input ends of the multiple inverters are connected in a parallel boost mode to form an independent input end; the independent output end of the direct current collection module is connected to the independent input end of the high-voltage direct current inverter module; the output end of the high-voltage direct current inverter module is connected to the input end of the alternating current parallel transformer; the output end of the alternating current parallel transformer is connected to the power grid to realize the output of wind farm energy. The technical solution proposed in the present application improves the voltage level of the collection through the series boost + parallel boost mode, realizes the purpose of high-voltage direct current transmission of wind power energy, and is easy to maintain and low in cost.

[0025] The following describes an energy output system based on high-voltage direct current transmission and conversion of wind turbine energy in an embodiment of the present application with reference to the accompanying drawings.

[0026] Embodiment 1

[0027] Figure 1 The structure diagram of an energy output system based on high-voltage direct current transmission and conversion of wind turbine energy is provided according to one embodiment of the present application, such as Figure 1 As shown, the system includes: a plurality of wind turbines 101, a DC collection module 102, a high-voltage DC inverter module 103, and an AC parallel transformer 104;

[0028] The output ends of the plurality of fans 101 are connected to the input end of the DC collection module 102;

[0029] The DC collection module 102 comprises a plurality of rectifiers 1, and the output ends of the plurality of rectifiers 1 are connected in series in a boosting manner to form independent output ends;

[0030] The high-voltage direct current inverter module 103 comprises a plurality of inverters 2, the input ends of the plurality of inverters 2 are connected in parallel in a current-increasing manner to form independent input ends;

[0031] The independent output end of the DC collection module 102 is connected to the independent input end of the high-voltage DC inverter module 103;

[0032] The output end of the high-voltage DC inverter module 103 is connected to the input end of the AC parallel transformer 104;

[0033] The output end of the AC parallel transformer 104 is connected to the power grid to achieve the output of wind farm energy.

[0034] It should be noted that the independent output terminal of the DC collection module 102 is connected to the independent input terminal of the high-voltage DC inverter module 103 according to the positive and negative polarities;

[0035] The 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;

[0036] The high-voltage direct current inverter module 103 is used to invert the high-voltage direct current power into high-voltage alternating current power and transmit it to the alternating current parallel transformer 104 .

[0037] It should be noted that Figure 1 The structure of the energy output system based on high-voltage direct current transmission and conversion of wind turbine energy is shown only as a structural illustration of the energy output system provided in this embodiment, and does not limit the structure of the energy output system of the present application.

[0038] In the embodiments of the present disclosure, Figure 1 As shown, the number of the plurality of wind turbines 101 , the plurality of rectifiers 1 , and the plurality of inverters 2 is N.

[0039] It should be noted that the multiple fans 101 are connected to the multiple rectifiers 1 in a one-to-one correspondence.

[0040] In the disclosed embodiment, the electric energy generated by the plurality of wind turbines 101 is rectified into direct current through the plurality of rectifier AC / DC modules in the direct current collection module 102, the output direct current of the plurality of AC / DC modules is boosted in series to become high-voltage direct current, the input end of the high-voltage direct current inverter module 103 meets the input of ultra-large current through parallel current boosting, and then the high-voltage direct current is transmitted to the onshore inverter station through the high-voltage direct current inverter module 103, and is inverted into alternating current through the plurality of inverter DC / AC modules, and the alternating current output of the plurality of DC / ACs is connected to the grid through the AC parallel transformer 104, thereby completing the purpose of high-voltage direct current transmission of wind power energy.

[0041] The energy output system based on high-voltage direct current transmission and conversion of wind turbine energy proposed in this embodiment has the following advantages:

[0042] 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;

[0043] 2. Aiming at the background of newly built wind farms, the high-voltage direct current transmission method with high voltage transmission and large current input is achieved through series boost + parallel current boost.

[0044] In summary, the energy output system based on high-voltage direct current transmission conversion of wind turbine energy proposed in this embodiment improves the collected voltage level, achieves the purpose of high-voltage direct current transmission of wind power energy, and is easy to maintain and low in cost.

[0045] 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.

[0046] 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.

[0047] 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. An energy output system based on high-voltage direct current transmission and conversion of fan energy, characterized in that: The system includes: multiple fans, a DC collection module, a high-voltage DC inverter module, and an AC parallel transformer; The output ends of the plurality of fans are connected to the input end of the DC collection module; The DC collection module comprises a plurality of rectifiers, and the output ends of the plurality of rectifiers are connected in series in a boosting manner to form independent output ends; The high-voltage direct current inverter module comprises a plurality of inverters, and the input ends of the plurality of inverters are connected in a parallel current-increasing manner to form independent input ends; The independent output end of the DC collection module is connected to the independent input end of the high-voltage DC inverter module; The output end of the high-voltage DC 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 energy output system according to claim 1, characterized in that: The independent output end of the DC collection module is connected to the independent input end of the high-voltage DC inverter module according to positive and negative polarities.

3. The wind energy output system according to claim 2, characterized in that: The number of the plurality of wind turbines, the plurality of rectifiers and the plurality of inverters is N.

4. The energy output system according to claim 3, characterized in that: The multiple fans are connected to the multiple rectifiers in a one-to-one correspondence.

5. The energy output system according to claim 4, characterized in that: The 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 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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