High voltage crossing control method of wind power full power converter

A control method and converter technology, which can be used in AC network voltage regulation, wind power generation, reactive power compensation, etc., and can solve problems such as overmodulation current runaway and current distortion.

Inactive Publication Date: 2016-03-02
CORONA WIND EQUIP BEIJING CO LTD
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  • Abstract
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Problems solved by technology

The invention can solve the problems of out-of-control overmodulation curr...

Method used

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  • High voltage crossing control method of wind power full power converter
  • High voltage crossing control method of wind power full power converter
  • High voltage crossing control method of wind power full power converter

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] The topological diagram of the full power converter is as follows: figure 1 As shown, the main circuit is composed of the grid-side converter 101, the generator-side converter 102, and the unloading circuit 103, and the general controller 111 includes three parts: the grid-side controller, the generator-side controller, and the unloading controller.

[0032] The present invention adopts the dynamic adjustment of the DC bus voltage reference value, the reactive current priority under the total current limit condition, the dynamic adjustment of the unloading input duty ratio value according to the bus reference value, and the current control algorithm based on the decoupling of the reference and error filter signals respectively corresponding to Four key positions related to the power grid in the general controller 111 are: reference value...

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Abstract

The present invention provides a high voltage crossing control method of a wind power full power converter. When the network voltage suddenly increases over 1.1 times rated voltage, the transient overvoltage is restrained through an off-load circuit connected with a direct circuit bus, inductive reactive current relative to the network voltage is output through a decoupled active and reactive positive-and negative-sequence current controller to reduce the amplitude of the network voltage, and the occurrence of overmodulation is avoided through dynamic regulation of the voltage reference value of the direct current bus. According to the invention, a converter can operate without being dissociated from the power grid free of complex mode switch in the condition of a network voltage not larger than 1.3 times rated value, and an effective inductive reactive output is provided.

Description

technical field [0001] The invention relates to a control method for high-voltage ride-through of a wind power full-power converter in the technical field of wind power generation. Background technique [0002] In recent years, more and more attention has been paid to the issue of high voltage ride through, and countries have successively formulated corresponding grid-connected guidelines, such as Australia, Canada, Denmark, Germany, Spain, the United States, and Ireland. There are detailed standard specifications and technical requirements. At present, GB / T9963-2011 "Technical Regulations for Wind Farm Connected to Power System" puts forward the requirements for the low voltage ride through (LVRT) capability of wind farms, and the relevant standards for high voltage ride through (HVRT) have not yet been released. [0003] With the improvement of the power level of wind turbines, from 2MW to 5MW, the application scale of full power converters based on synchronous generators...

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Application Information

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IPC IPC(8): H02J3/38H02J3/12H02J3/16H02J3/14
CPCY02E10/76Y02E40/30
Inventor 董志然许洪华
Owner CORONA WIND EQUIP BEIJING CO LTD
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