Method and system for inhibiting total active power fluctuation through doubly fed induction wind power system

A doubly-fed induction, wind power system technology, applied in the direction of reducing/preventing power oscillation, which can solve problems such as system output active power fluctuations

Active Publication Date: 2013-07-24
STATE GRID CORP OF CHINA +2
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  • Abstract
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Problems solved by technology

[0003] In view of this, the purpose of this application is to provide a method and system for doubly-fed induction wind power system to suppress total active power fluctuations, so as to solve the problem of system output active power fluctuations under unbalanced grid voltage

Method used

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Embodiment Construction

[0067] For reference and clarity, technical terms, abbreviations or abbreviations used hereinafter are summarized as follows:

[0068] DFIG: Doubly Fed Induction Generator, doubly fed induction generator;

[0069] PGSC: Parallel Grid-Side Converter, parallel network side converter;

[0070] SGSC: Series Grid-Side Converter, series grid-side converter;

[0071]RSC: Rotor-Side Converter, rotor side converter;

[0072] PWM: Pulse Width Modulation, pulse width modulation

[0073] SVPWM: Space Vector Pulse Width Modulation, space vector pulse width modulation.

[0074] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without ...

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Abstract

The invention discloses a method for inhibiting total active power fluctuation through a doubly fed induction wind power system and a system for inhibiting the total active power fluctuation through the doubly fed induction wind power system. According to the method, a serial grid-side transformer is utilized to inject a serial voltage vector to a stator loop to keep stator voltage symmetric, so that stator and rotor three-phase currents of a wind power system are symmetric, electromotor power and electromagnetic torque do not have second harmonic generation fluctuation, and a parallel grid-side transformer is utilized to output proper current, so that fluctuant components of power flowing through serial grid-side active power can be counteracted through fluctuant components of the active power of a parallel grid-side output, no fluctuation of the total output active power of the whole system can be achieved, and continuous operation capacity of the wind power system can be enhanced under an asymmetric power grid condition.

Description

technical field [0001] The present application relates to the technical field of wind power generation, and in particular to a method and system for suppressing fluctuations in total active power of a doubly-fed induction wind power system. Background technique [0002] In the doubly fed induction wind power system, the stator of the doubly fed induction generator (DFIG) is directly connected to the grid, so when the grid voltage is unbalanced, the stator voltage will also be unbalanced, which will lead to stator and rotor Unbalanced current will eventually lead to fluctuations in generator output power and electromagnetic torque, reducing the service life of the generator and affecting the quality of grid-connected power generation. Therefore, there is an urgent need for a doubly-fed induction wind power system control method and system to solve the stator voltage imbalance problem caused by the grid voltage imbalance. Contents of the invention [0003] In view of this, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 何国军姚骏陈涛黄淼付昂文一宇张友强蒋昆
Owner STATE GRID CORP OF CHINA
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