双馈风力发电机的次同步控制相互作用机理与特性研究  

Mechanism and Characteristic Study on Sub-Synchronous Control Interaction of a DFIG-Based Wind-Power Generator

作　　者：张剑 肖湘宁 高本锋 罗超 陈甜妹 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《电工技术学报》2013年第12期142-149,159,共9页Transactions of China Electrotechnical Society

基　　金："十二五"国家科技支撑计划重大项目(2011BAA01B02);中央高校基本科研业务费专项资金(12QN37)资助项目

摘　　要：双馈风力发电机经固定串补线路送出会出现其转子侧变流器与串联电容之间的次同步振荡问题,称为次同步控制相互作用。本文基于单机无穷大系统,分析了次同步控制相互作用的机理,推导出一种判定次同步控制相互作用存在的条件。提出了一种区分由固定串补引起的双馈风机感应发电机效应和次同步控制相互作用的方法。采用时域仿真法分析了风速、输电线路串补度以及转子侧变流器的控制参数对次同步控制相互作用特性的影响。分析结果表明,风速的减小和串补度的提高会增强次同步控制的相互作用,会迅速导致双馈感应发电机输出功率的发散型振荡;控制器内外环增益的增大和积分时间常数的减小同样会加剧这一相互作用,其中,次同步控制相互作用对内环增益的变化最为敏感。Sub-synchronous oscillation can be caused by the interaction between rotor side converter of a doubly-fed induction generator（DFIG）-based wind-power generator connected to a fixed series-compensated transmission line and series capacitor, which is known as sub-synchronous control interaction（SSCI）. In this paper, the mechanism of SSCI is analyzed based on a single machine infinite bus system and one condition used to determine the existence Of SSCI is deduced. A method used to distinguish induction generator effect（IGE） and SSCI of DFIG caused by a fixed series- compensated transmission line is presented. The effects of wind speeds, compensation levels and the parameters of rotor side converter controller on the characteristics of SSCI are analyzed by time- domain simulation method. It is shown by the analysis results that a decrease in wind speed and an increase in compensation level will enhance SSCI, which will lead to rapid growing oscillation of power produced by DFIG, and an increase in the controller inner or outer gain and a decrease in controller inner or outer integration time constant will also boost the interaction. Among them, SSCI is the most highly sensitive to the rotor side converter controller inner gain.

关 键 词：次同步振荡 双馈感应发电机 感应发电机效应 次同步控制相互作用 阻抗扫描 时域仿真 

分 类 号：TM315[电气工程—电机] TM712