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

Inactive Publication Date: 2018-01-12
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Redundant bridge arms increase system cost, and virtual bridge arms cause fluctuations in DC bus voltage
The invention patent with the application number CN201610595829.X proposes a reconfiguration control technology based on virtual bridge arms, and realizes the reconfiguration control of parallel converters through the method of independent control of the bridge arm current of each phase, but this method has certain heavy Due to structural constraints, when the same-phase bridge arm of the parallel converter fails, the converter cannot be reconfigured

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  • Wind power converter bridge arm multiplex reconstruction control method and system
  • Wind power converter bridge arm multiplex reconstruction control method and system
  • Wind power converter bridge arm multiplex reconstruction control method and system

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0037] The present invention proposes a fault reconfiguration control method based on bridge arm multiplexing for wind power converters. The faulty phases share the same phase bridge arms of back-to-back converters through bidirectional switches to realize the reconfiguration operation of wind power converters. This method only The control strategy of the converter needs to be modified, and the dynamic response is fast and the fault tolerance range is wide.

[0038] With the development of wind power te...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02J3/38
CPCY02E10/76
Inventor 蔡旭陈根
Owner SHANGHAI JIAO TONG UNIV
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