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Two-stage matrix convertor for megawatt wind power generation

A converter and megawatt-level technology, applied in the direction of wind power generation, AC power input conversion to AC power output, AC power input conversion to DC power output, etc. Reliability, increasing unit volume and weight, etc., to achieve excellent input and output performance, improve operational reliability, and reduce volume and weight

Inactive Publication Date: 2008-03-12
TIANJIN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This kind of dual PWM converter usually needs to connect a large-capacity energy storage capacitor (which can be called a smoothing capacitor) in parallel on the DC bus, thereby increasing the volume and weight of the unit; Shorter, which reduces the operational reliability of wind turbines

Method used

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  • Two-stage matrix convertor for megawatt wind power generation
  • Two-stage matrix convertor for megawatt wind power generation
  • Two-stage matrix convertor for megawatt wind power generation

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Embodiment Construction

[0019] best practice

[0020] The present invention will be described in further detail below according to the accompanying drawings and embodiments.

[0021] Figure 4 is a schematic diagram of a doubly-fed wind turbine excited by a bidirectional matrix converter. The main circuit 1 of the converter is composed of two converters with the same structure connected back-to-back through the DC bus. The positions in the unit are called grid-side converter 1a and motor-side converter 1b respectively. The AC terminal of the motor-side converter 1b is connected to the output of the generator, and the DC terminal is directly connected to the DC terminal of the grid-side converter 1a. The AC end of the grid-side converter 1a is connected to a three-phase filter 3 composed of three-phase inductors and three-phase capacitors, and then connected to the grid through an input filter circuit composed of a three-phase transformer. The motor-side converter and the grid-side converter 1a respe...

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PUM

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Abstract

The utility model relates to a double-stage matrix converter for Mega Watt wind turbine, belonging to the technical filed of wind turbine, and comprising a motor side converter and a net side converter. The utility model is characterized in that the motor side converter and the net side converter are respectively formed by connecting three-phase bridge type arms in parallel which consist of six double-direction switches with same structure. Each double-direction switch is formed by reversely connecting the common emitters of two insulated double-stage transistors in series or reversely connecting the common connectors of two insulated double-stage transistors in series. The motor side converter and the net side converter are back-to-back connected with each other through a DC bus-bar. The utility model has the advantages of good input and output performance, reversible energy transmission, no energy storing element needed in the DC link, real time control on the rotation of the wind turbine motor unit and adjustable input and output power factors of the motor unit.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and relates to a power converter suitable for use in megawatt-level and above high-power wind power generating sets. Background technique [0002] Wind energy is a random and unstable energy source, and wind power generation is its main form of utilization. In recent years, the single-unit capacity of wind turbines has continued to increase, and variable-speed constant-frequency and pitch-variable wind turbines have gradually occupied a dominant position in the wind power market. Among them, the variable-speed constant-frequency double-fed wind turbine can flexibly control the output of active power and reactive power, and can play a role in reactive power compensation for the power grid, which has high industrialization value. In addition, wind turbine manufacturing companies headed by Germany's Enercon launched a series of gearbox-less direct-drive wind turbines at the end of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02M1/12H02M7/219H02M7/5387H02J3/38
CPCY02E10/763Y02E10/76
Inventor 夏长亮陈炜宋战锋史婷娜
Owner TIANJIN UNIV
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