Current-type multi-level converter system for wind power integration

A multi-level conversion and current-type technology, applied in wind power generation, AC power input conversion to AC power output, AC power input conversion to DC power output, etc., to improve output performance, fast dynamic response, and improve operating performance Effect

Active Publication Date: 2011-01-26
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of how to improve the operation performance of wind power generators, the power generation quality of wind power generators, and the grid compatibility of wind power generators, and provide a current-type multi-level converter system applied to wind power grid-connected

Method used

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  • Current-type multi-level converter system for wind power integration

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Embodiment

[0038] Embodiment: A current-type multi-level converter system applied to a wind power grid-connected system, characterized in that the system is composed of a main circuit and a control circuit, wherein the main circuit includes a rectifier circuit, a converter circuit and a filter .

[0039] Rectification circuit: An uncontrollable rectification bridge composed of low-cost diodes converts the alternating current generated by the wind turbine into direct current. In principle, no position or speed sensor is required, which simplifies the structure and reduces the cost.

[0040] Inverter circuit: convert direct current into alternating current, and connect to the grid through a grid-connected transformer. Among them, in order to ensure the power quality, the design of the filter is also involved.

[0041] Filter: including AC side filter and DC side filter; DC side filter is used to filter out DC side current ripple, and at the same time ensure that the system has a fast dyna...

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Abstract

The invention discloses a current-type multi-level converter system for wind power integration. The system is characterized by comprising a main circuit and a control circuit, wherein the main circuit comprises a rectifier circuit and an inverter circuit. The system has the advantages that: the multi-level converter system has the characteristics of large power capacity, low switch frequency, small output harmonic, high electromagnetic compatibility and the like, the output performance of the converter system is improved while the capacity is increased, and the output current of a current source-type converter is easy to control; overcurrent and short-circuit protection is easy to realize and the work is more stable and reliable; direct current-side inductance has a function of increasingvoltage, the front-end power supply voltage is allowed to be relatively low, and therefore the range of available wind speed is expanded; meanwhile, the topology of the current-type converter is relatively simple and thus the cost of a wind power system is reduced.

Description

【Technical field】 [0001] The invention belongs to the field of grid-connected wind power generation, and designs a novel current-type multi-level converter system by using power electronics technology, and applies it to the grid-connected system of wind power generation. 【Background technique】 [0002] Along with the increasingly acute energy and environmental problems, the research on wind power generation technology has received unprecedented attention in the past two decades. As a country with a large energy consumption, my country's wind power industry has developed very fast in recent years. Compared with conventional generators, wind turbines have significant characteristics: (1) The randomness and uncertainty of wind speed determine the randomness and uncertainty of wind power; (3) The asynchronous wind turbine absorbs reactive power from the grid during operation. The ultimate goal of wind power generation is to connect to the grid and put it into operation. The ch...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M7/5387H02M1/14H02M1/12H02J3/38
CPCY02E10/763Y02E10/76
Inventor 马幼捷刘进华周雪松问虎龙周宣征刘欣朱毅然于阳谷月崔立强
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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