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High-power wind power generation interconnection system

A wind power generator and high-power technology, which is applied in the field of centralized multi-combination and inverter module grid-connected systems, can solve the problems of large power loss and inconvenient control of power electronic devices, and achieve improved reliability and inverter The method is flexible and reduces the effect of high-frequency electromagnetic interference

Inactive Publication Date: 2008-06-18
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the existing wind power generation system such as relatively large loss of electric energy during transmission and inconvenient control of power electronic devices.

Method used

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  • High-power wind power generation interconnection system

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Embodiment Construction

[0020] As shown in Figure 1, the electric energy output by each fan is rectified and chopped to convert wind energy into high-voltage DC electric energy. The anode of the diode D is connected to the output end of the chopper, and the cathode of the diode D is connected to the DC smoothing reactor at the input end of the high voltage direct current transmission line. The main function of diode D is to block negative current. The DC smoothing reactor at the output end of the HVDC transmission line is connected to the input end of the multi-combination inverter module at the substation side. The multi-combination inverter module converts the high-voltage DC power into three-phase AC power, which is connected to the public power grid through the star-delta transformation of the transformer. The sensor detects the status of the power grid and provides feedback signals to the wind turbine controller and inverter controller. The wind turbine controller changes the state of the wind...

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Abstract

In order to overcome disadvantages of larger loss of electrical energy in transmission process and inconvenient control on electric installation, the invention cancels inverter in electric installation in each wind driven generator. The invention combines each inverter to realize modularized design. The inversion module incorporated from multiple sets includes multiple inverters and a mutual inductor L. Input end of each inversion module is parallel connected to input end P of incorporated module. Output ends M1, M2 are connected to a set of input end of the mutual inductor L. through the mutual inductor L, AC voltage output from each inverter is incorporated to one phase AC voltage, which is output through X1, X2 ends. DC power transmission in high voltage is adopted between blower fan and power network. The invention raises efficiency and reliability of system.

Description

technical field [0001] The invention relates to a large-power wind power generation grid-connected device, in particular to a centralized multi-combination and inverter module grid-connected system. Background technique [0002] Wind energy, as a clean renewable energy, has been paid attention to by countries all over the world since the mid-1970s. Because wind power has more economic competitive advantages than other renewable energy utilization, it has developed rapidly. At present, the grid-connected power generation of large units has become the main form of wind energy utilization in the world. [0003] In the existing wind power generation system, after the wind generator converts wind energy into electrical energy, the electrical energy is input to the grid through a series of power electronic devices. (See Figure 8-6 on page 134 of "Control Technology of Wind Power Generating Sets" published by Machinery Industry Press in June 2002) The power generated by the wind p...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCY02E10/763Y02E10/76
Inventor 汪至中
Owner BEIJING JIAOTONG UNIV