电力系统保护与控制Issue(2)：7-12,6.
计及撬棒保护的双馈风电机组不对称短路电流特性分析
Unsymmetrical short circuit current analysis of doubly fed induction generators with crowbar protection
摘要
Abstract
Electromagnetic transient characteristics of doubly fed induction generator (DFIG) are very complex during the terminal voltage severely dips. One issue that has not received much attention so far is the contribution of DFIG to the asymmetrical short-circuit fault. In order to describe the DFIG’s asymmetrical short-circuit current characteristics accurately, positive and negative sequence vector model of DFIG are established based on space vector theory and sequence component method. Considering the different initial operating power of DFIG, the accurate mathematical expressions of the stator and rotor flux after crowbar insertion is deduced through mathematical analysis. After that, then the accurate expressions of the stator and rotor short circuit current are derived. The method is also suitable for the calculation of DFIG short circuit when symmetrical fault occurs. Finally, the mathematical expressions of stator current are verified according to the standard DFIG model in MATLAB/SIMULINK under the cases of symmetrical and asymmetrical voltage dips respectively.关键词
双馈风电机组/不对称故障/撬棒保护/短路电流特性/故障分析Key words
doubly fed induction generators (DFIG)/unsymmetrical fault/crowbar protection/short-circuit current characteristics/fault analysis分类
信息技术与安全科学引用本文复制引用
郑涛,魏占朋,李娟,王皓靖..计及撬棒保护的双馈风电机组不对称短路电流特性分析[J].电力系统保护与控制,2014,(2):7-12,6.基金项目
国家高技术研究发展计划（863计划）资助项目（2012AA050208）@@@@This work is supported by National High-tech R&D Program of China (863 Program)(No.2012AA050208) （863 Program）
