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含风电场电网的低频强迫振荡分析与控制

发表时间:2017-01-23  浏览量:1303  下载量:308
全部作者: 李聪,刘瑞叶,张伟
作者单位: 国网北京市电力公司;哈尔滨工业大学电气工程及自动化学院
摘 要: 基于标幺值体系建立7阶双馈风机(doubly fed induction generator,DFIG)模型。推出含风电的单机无穷大系统全风况下的小信号线性化数学模型,计算特征根和参与因子,分析出系统存在高低两种频率的强迫振荡模态,分别由轴系和桨距角控制系统引起。随后,提出改进的最大平滑功率追踪(maximum power point tracking, MPPT)策略。基于Matlab/Simulink详细仿真模型,验证理论的正确性与适用性,为日后低频强迫振荡的预防与控制提供理论基础。
关 键 词: 电力系统及其自动化;风力发电;7阶双馈风机模型;标幺值体系;低频强迫振荡
Title: Forced low frequency oscillation of wind-integrated power systems
Author: LI Cong, LIU Ruiye, ZHANG Wei
Organization: State Grid Beijing Electric Power Company; School of Electrical Engrineering and Automation, Harbin Institute of Technology
Abstract: Due to a large number of wind generators integrated to power systems, some new problems for the grid such as the forced low frequency oscillation (LFO) may occur. In order to ensure the safety and stability of Wind-Integrated Power Systems, Analysis and control of the LFO is particularly important. Based on the per-unit value system, this paper established a 7-order model DFIG and analyzed the small signal linear mathematical model of One Machine Infinity Bus (OMIB) containing wind farms under various wind speed, calculated the characteristic root and participation factor, concluded that there are two forced low oscillation modes separately of high and low frequency in the system which are caused by shaft system and pitch angle control system respectively.What's more, this paper put forwar an improved MPPT strategy. Based on discrete model simulation, the validity of the conclusion is verified, which can provide basic theoretical analysis of forced LFO for future measures of prevention and control.
Key words: power system and automation; wind power generation; 7-order model doubly fed induction generton; per-unit value system; low frequency forced oscillation
发表期数: 2017年1月第2期
引用格式: 李聪,刘瑞叶,张伟. 含风电场电网的低频强迫振荡分析与控制[J]. 中国科技论文在线精品论文,2017,10(2):137-148.
 
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