接入配电网的双馈风力发电机短路电流特性及影响  

Characteristics of Short-circuit Current of Wind Turbine Driven DFIG and Its Impacts on Grid-connected Distribution Network

作　　者：欧阳金鑫[1] 熊小伏[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆市400030

出　　处：《电力系统自动化》2010年第23期106-110,123,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50777068);输配电国家重点实验室资助项目(2007DA10512709202)~~

摘　　要：目前关于基于双馈感应发电机(DFIG)的风力发电机组短路电流的研究以非并网DFIG以及并网DFIG机端短路的情况为主,很少考虑电网对DFIG短路电流的影响。针对DFIG以分布式电源的方式接入配电网,其短路电流可能会受到配电网运行工况、短路点与DFIG接入点位置等影响的问题,结合DFIG的控制策略进行了理论推导和仿真分析。首先,基于感应电机的Park模型,对DFIG在电网故障时的短路过程进行了数学推导和分析,给出了计及控制策略变化的并网DFIG短路电流的解析表达式。然后,对DFIG短路电流的特性进行了分析,针对可能影响DFIG短路电流的各种因素进行了分析和仿真,并给出了相关结论。Most research on the short-circuit current contributed by wind turbine driven doubly-fed induction generator（DFIG） focuses on the non-grid-connected DFIG and grid-connected DFIG with the short-circuit point located at the generator＇s terminal.When the DFIG is connected to a distribution network,the short-circuit current of DFIG may be affected by the characteristics of the distribution network,the location of the short-circuit point and other factors.First,based on the Park model of induction motor,a detailed mathematical derivation for the transient characteristics of DFIG in the external fault is conducted and analyzed.The composition of the short-circuit current of DFIG and an approximate expression of the shortcircuit current are proposed.Then,the effect factors to short-circuit current of DFIG are analyzed.Finally,the simulation shows the correctness of the analysis.

关 键 词：双馈感应发电机 短路电流 分布式电源 配电网 电压降 

分 类 号：TM315[电气工程—电机]