Wind power converter bridge arm multiplex reconstruction control method and system

A technology of a wind power converter and a control method, which is applied to wind power generation, electrical components, and output power conversion devices, and can solve problems such as DC bus voltage fluctuations, converters that cannot be reconfigured, and increased system costs, and achieve Fast response speed, wide range of fault tolerance, and the effect of optimized control technology
CN107579653AInactive Publication Date: 2018-01-12SHANGHAI JIAO TONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI JIAO TONG UNIV
Publication Date
2018-01-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a wind power converter bridge arm multiplex reconstruction control method and system. After a fault occurs, a two-way switch tube on a fault phase is switched on, and a converter enters a bridge arm multiplex reconstruction mode; a network side converter adopts voltage directional control, a machine side converter adopts magnetic field directional control, and three-phase voltage at a machine side and a network side is given; a zero-sequence voltage injection PWM method is used, the given three-phase voltage of the machine side and the network side is converted into modulation voltage of each normal phase bridge arm, and bridge arm multiplex reconstruction control is achieved. A two-way switch is additionally arranged to achieve bridge arm multiplexing, and the control technology of the converter is optimized to achieve bridge arm fault reconstruction control; the reconstruction operation of any bridge arm fault can be achieved, the fault tolerance range is wide,and the response speed is high.
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Description

technical field

[0001] The present invention relates to the technical field of control of wind power converters, in particular to a method and system for multiplexing and reconfiguring control of bridge arms of wind power converters. Background technique

[0002] Currently, renewable energy is developing rapidly, especially wind power and photovoltaics. With the increasing maturity of wind power technology, wind power has developed on a large scale around the world. With the continuous development of onshore wind power resources, wind power has begun to develop from land to sea, and large-capacity offshore wind turbines is a development trend. High reliability is the most basic requirement for offshore wind power converters.

[0003] In order to improve the operation reliability of the converter, the redundant bridge arm and the virtual bridge arm can be used to realize the reconstructed operation of the converter after failure. After the converter fails, first isolate an...

Claims

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