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Double-fed wind generator fuzzy damping control method for improving oscillation of power system

A power system and damping control technology, applied in the field of smart grid, to improve the low-frequency oscillation capability and improve the stability of small signals

Pending Publication Date: 2021-05-28
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

my country's large-scale wind farms are usually distributed in remote areas, they are far away from the power load center, so their transmission lines often have the characteristics of long distance and heavy load, coupled with the randomness and volatility of wind power, large-scale wind power grid integration often leads to power The system is at risk of weakly (negatively) damped low-frequency oscillations

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  • Double-fed wind generator fuzzy damping control method for improving oscillation of power system
  • Double-fed wind generator fuzzy damping control method for improving oscillation of power system
  • Double-fed wind generator fuzzy damping control method for improving oscillation of power system

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[0051] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. Unless otherwise specified, all technical and scientific terms used herein have the same technical meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0053] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprises" and / or "comprises" are used in this specification, they mean There are features, steps, operations, mea...

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Abstract

The invention provides a doubly-fed wind generator fuzzy damping control method for improving oscillation of a power system. The method comprises the steps of 1, listing a rotor electrokinetic equation of a doubly-fed wind generator under a dq coordinate system, 2, based on a rotor electrokinetic equation under a dq coordinate system of the doubly-fed wind generator, according to an oscillation mechanism of a DFIG injection power damping power system, finding a relational expression between DFIG active output and frequency micro-variation, 3, establishing a DFIG active power control loop model according to the relationship between the DFIG active power output and the frequency micro-variation, and 4, designing a fuzzy additional damping controller based on the DFIG rotor side active power control loop model to improve the low-frequency oscillation damping capacity of the power system. The doubly-fed wind power plant participates in the low-frequency oscillation damping process of the power system through the power adjusting capacity of the doubly-fed wind power plant, and compared with a traditional control method, the method can improve the low-frequency oscillation suppression capability of a wind power plant and improve the small-signal stability of the power system.

Description

technical field [0001] The invention belongs to the field of smart grids, and can be applied in the fields of new energy power generation, new energy grid connection, etc., and specifically relates to a fuzzy damping control method for doubly-fed wind turbines that improves power system oscillations. Background technique [0002] In recent years, with the continuous increase of wind power installed capacity, the construction of mega-kilowatt wind farms (wind power bases) and the realization of large-scale cross-regional transmission of wind power have become the strategic focus of wind power development. my country's large-scale wind farms are usually distributed in remote areas, they are far away from the power load center, so their transmission lines often have the characteristics of long distance and heavy load, coupled with the randomness and volatility of wind power, large-scale wind power grid integration often leads to power The system is at risk of weakly (negatively)...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/48H02J3/50H02P21/22
CPCH02J3/48H02J3/50H02P21/22H02J3/241H02J2203/20Y02E10/76
Inventor 刘新宇李勇顾波王亚辉樊要玲张红涛刘雪梅赵明明林政国刘延华吕灵灵岳伟宝常瑞徐燕
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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