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Method for controlling harmonic current of full-power converter for suppressing wind power grid integration and controller

A technology of harmonic current and control method, which is applied in the field of harmonic current control method and controller of full-power converters for wind power grid-connected, and can solve the problem of unfavorable grid-connected harmonic current. Subharmonic reactance cross-coupling effects and other issues

Inactive Publication Date: 2012-09-12
CHONGQING UNIV
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Problems solved by technology

However, the control schemes proposed in the prior art have not considered the cross-coupling effect of the low-order harmonic reactance on the harmonic current loop, which will not be conducive to the precise control of the grid-connected harmonic current and the stable operation of the system.

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  • Method for controlling harmonic current of full-power converter for suppressing wind power grid integration and controller
  • Method for controlling harmonic current of full-power converter for suppressing wind power grid integration and controller
  • Method for controlling harmonic current of full-power converter for suppressing wind power grid integration and controller

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Embodiment Construction

[0064] The present invention will be described in further detail below in conjunction with specific embodiments.

[0065] like Figures 1 to 5 As shown, a method for controlling the harmonic current of a full-power converter for wind power grid-connected is characterized in that it includes the following steps:

[0066] (1) Collect the three-phase current i of the grid-connected converter ga , i gb , i gc :

[0067] (2) Collect the three-phase voltage u of the power grid ga , u gb , u gc ;

[0068] (3) Three-phase grid voltage signal u ga , u gb , u gc After the static three-phase abc coordinate system is transformed into the static two-phase αβ coordinate axis coordinate system with constant power transformation, the voltage e in the αβ axis coordinate system is obtained α , e β ,

[0069] e α e ...

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Abstract

The invention discloses a method for controlling the harmonic current of a full-power converter for suppressing wind power grid integration and a controller. The method comprises the following steps of: acquiring three-phase current and three-phase voltage of a grid-integrated converter, performing constant power conversion on an acquired network side three-phase current signal from a static three-phase coordinate system to synchronous, five-time, seven-time, eleven-time and thirteen-time rotary coordinate systems, and performing low pass filtering to obtain a dq axis component; and obtaining a dq axis control voltage by adopting a network voltage directional vector control way, performing constant power conversion on the control voltage from synchronous, five-time, seven-time, eleven-time and thirteen-time rotary coordinate systems to the static three-phase coordinate system to obtain a fundamental wave control voltage and five-time, seven-time, eleven-time and thirteen-time harmonic wave three-phase control voltages, adding the fundamental wave control voltage and the five-time, seven-time, eleven-time and thirteen-time harmonic wave three-phase control voltages to obtain a final control voltage, and modulating the final control voltage to obtain a control switch signal, so that accurate control of five-time, seven-time, eleven-time and thirteen-time harmonic current is realized.

Description

technical field [0001] The invention relates to a current control method and a controller, in particular to a control method and a controller for controlling the harmonic current of a full-power converter used for wind power grid connection. Background technique [0002] In a wind power generation system that uses a full-power converter connected to the grid, the inductance of the grid-side input reactor of the grid-connected converter is generally small, and its switching frequency is low. The harmonic voltage of the grid and the power electronic switching device of the inverter Nonlinear characteristics such as dead zone and tube voltage drop will cause the grid-connected converter to generate a large degree of low-order (5th, 7th, 11th, 13th) harmonic currents, especially the 5th and 7th harmonic current components heavier. This will lead to the distortion of the grid-connected current waveform of the wind power generation system, and the deterioration of the sinusoidali...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/38
CPCY02E40/40
Inventor 姚骏夏先锋刘奥林李清
Owner CHONGQING UNIV
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