基于Crowbar保护的双馈感应发电机组的低电压穿越研究  

Analysis of Doubly-Fed Induction Generator Low Voltage Ride Through Based on Crowbar Protection

作　　者：张靠社[1] 王媛[1] 胡德海 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]铜川供电局调度中心,陕西铜川727031

出　　处：《电网与清洁能源》2011年第10期66-71,共6页Power System and Clean Energy

摘　　要：分析了双馈感应发电机组在电网电压跌落时Crowbar阻值变化对电网的影响。根据双馈感应发电机(Doubly-FedInduction Generator,DFIG)的数学模型,推导出在发电机机端发生对称故障时,定子、转子电流的表达式,通过故障期间的最大转子电流,给出Crowbar阻值估算值。在EPSCAD/EMTDC软件中仿真分析不同的Crowbar阻值对系统的影响,验证公式推导的正确性,并通过仿真试验确定合理的Crowbar切除出时间。The influence of the crowbar resistors on the electrical behavior of the Doubly-Fed Induction Generator （DFIG） during the grid voltage dips is analyzed in this paper. According to the mathematical modal of DFIG, the current expressions of stator and rotator are deduced under the condition of symmetrical fault of generator, also the appropriate crowbar by-pass resistor is given by the maximum rotor current. In PSCAD/EMTDC, the different crowbar by-pass resistors and their impacts on the system are simulated, then the correctness of the formula is verified, and the reasonable time for removal of crowbar is confirmed by the simulations.

关 键 词：双馈感应发电机 低电压穿越 Crowbar保护电路 Crowbar阻值 

分 类 号：TM315[电气工程—电机]