考虑网侧控制与机端相位跳变的双馈风电机组对称故障暂态特性研究  

Transient Characteristics of Symmetrical Short Circuit Fault in Double Fed Induction Generators Considering Grid-Side Converter Control and Phase-Angle Jump of DFIG's Terminal Voltage

作　　者：马静 蓝新斌 丁秀香 王增平 

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),北京市昌平区102206 [2]广东电网电力调度控制中心,广东省广州市510600

出　　处：《电网技术》2014年第7期1891-1897,共7页Power System Technology

基　　金：国家863高技术基金项目(2012AA050208);国家自然科学基金项目(51277193);中央高校基本科研业务费专项资金资助项目(2014ZZD02);河北省自然科学基金项目(E2012502034)~~

摘　　要：目前在双馈风电机组(doubly-fed induction generator,DFIG)对称短路暂态特性的研究中,未充分考虑DFIG网侧变流器控制以及机端电压相位跳变等因素。为此,首先建立了综合考虑上述2种因素的DFIG故障暂态模型,在此基础上,推导了电网三相对称故障情况下的DFIG转子电流和定子电流的瞬时表达式,分析了DFIG机端电压相位跳变以及DFIG网侧变流器控制在故障时对短路电流的作用机理,实现了电网故障下DFIG故障暂态过程更为准确的描述。时域仿真与动模实验结果均验证了短路电流表达式的正确性。At present in the research on transient characteristics of doubly fed induction generator（DFIG） under symmetrical short circuit fault in external power grid, such factors as grid-side converter control of DFIG and phase-angle jump of DFIG＇s terminal voltage are not fully considered. For this reason, firstly a transient model of DFIG fault, in which above-mentioned two factors are taken into account synthetically, is established; on this basis, instantaneous expressions for stator current and rotor current of DFIG under three-phase symmetrical fault occurred in power grid are derived, and the impacting mechanism of phase-angle jump of DFIG terminal voltage and grid-side converter control on short-circuit current during symmetrical short circuit fault in external power grid is analyzed, thus a more accurate description on transient process in DFIG under fault in external power grid is given. The correctness of the given expressions for short-circuit current is validated by results of both time-domain simulation and dynamic simulation experiments.

关 键 词：双馈风电机组 电网三相对称故障 网侧变流器控制 DFIG机端电压相位跳变 

分 类 号：TM721[电气工程—电力系统及自动化]