基于撬棒保护的双馈风电机组三相对称短路电流特性  

Three-phase Symmetrical Short-circuit Current Characteristics Analysis of Wind Turbine Driven DFIG with Crowbar Protection

作　　者：翟佳俊[1] 张步涵[1] 谢光龙[1] 毛承雄[1] 王魁[1] 

机构地区：[1]强电磁工程与新技术国家重点实验室,华中科技大学,湖北省武汉市430074

出　　处：《电力系统自动化》2013年第3期18-23,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50837003);国家高技术研究发展计划(863计划)资助项目(2011AA05A101);国家重点基础研究发展计划(973计划)资助项目(2009CB219702)~~

摘　　要：双馈感应发电机在其并网点电压跌落较深时必须具备低电压穿越能力,而撬棒(crowbar)保护电路是目前运用较为广泛的一种低电压穿越方式。分析了装设有撬棒保护电路的双馈风电机组机端三相对称短路情况下的短路电流特性,通过仿真软件PSCAD/EMTDC研究了影响双馈风电机组输出短路电流的因素,包括撬棒电阻、直流母线电压和网侧变流器,推导了双馈风电机组在额定运行工况下定、转子短路电流的近似求解公式。最后,在考虑定转子磁链耦合作用的基础上给出了一种等效阻抗电压源模型,有利于接有分布式风电机组的配电网保护配置的进一步研究。For doubly fed induction generator（DFIG）,the crowbar protection is a commonly used method to improve the low voltage ride-through（LVRT） ability when there is a voltage sudden drop in the grid.The three-phase symmetrical short-circuit current characteristics of wind turbine driven DFIG with crowbar protection have been analyzed.Several effects have been taken into account in determining fault current from a wind turbine driven DFIG,including crowbar resistance,DC-side voltage and control strategy of grid-side converter in PSCAD/EMTDC.Approximation formulas of short-circuit current calculation are given on the basis of previous analysis.Finally,an equivalent impedance voltage source model considering the stator flux coupling is proposed,which helps further research for the protection configuration of distribution network with distributed wind generators.

关 键 词：风力发电 双馈感应发电机 低电压穿越 撬棒电阻 短路电流 网侧变流器 

分 类 号：TM315[电气工程—电机]