一种改进撬棒电路保护法在风电场LVRT中的应用  

Application of Improved Crowbar Circuit Protection Method to LVRT of Wind Farm

作　　者：毕溱 刘毅力[1] 尚小东 任正 刘卫明 BI Qin;LIU Yili;SHANG Xiaodong;REN Zheng;LIU Weiming(School of Electronic Information,Xi’an Polytechnic University,Xi’an 710048,China;State Grid East Inner Mongolia Electric Power Research Institute,Hohhot 010000,China)

机构地区：[1]西安工程大学电子信息学院,陕西西安710048 [2]国网内蒙古蒙东电力科学研究院,内蒙古呼和浩特010000

出　　处：《智慧电力》2020年第11期22-28,共7页Smart Power

基　　金：国家自然科学基金青年科学基金资助项目(51707141);陕西省重点科技创新国家计划项目(2014KCT-16)。

摘　　要：根据风电场并网必须具备低电压穿越的要求,对某风电场传统撬棒电路进行改进,并加入直流卸荷保护电路以提高风电场低电压穿越能力;首先研究了双馈感应发电机的暂态过程和转子侧故障电流表达式,进一步推出撬棒电阻值的选取范围,优化了撬棒及直流卸荷电路的触发脉冲信号;在Matlab/Simulink仿真软件中搭建风机并网模型,进行3种不同故障类型的仿真,结果证明了撬棒及卸荷电阻值选取的合理性和改进保护电路方法的优越性。According to low voltage ride through requirement for grid-connected wind farm,the traditional crowbar circuit for a wind farm is improved,and a DC-chopper protection circuit is added to improve the low voltage ride-through capability of the wind farm.Firstly,the transient process of doubly-fed induction generator and rotor-side fault current expression is studied,the selection of range of crowbar resistance value is further introduced,and the trigger pulse signal of the crowbar and DC-chopper circuit is optimized.Then the grid connected wind turbine model is built based on Matlab/Simulink to simulate three types of fault,the results show that the rationality of the selection of the crowbar and unloading resistance and the superiority of the improved protection circuit method.

关 键 词：风电场 双馈感应发电机 低电压穿越 撬棒电路 直流卸荷电路 

分 类 号：TM614[电气工程—电力系统及自动化]