摘要
针对双馈风电机组(DFIG)低电压穿越问题,为克服传统撬棒(Crowbar)电路保护的不足,以抑制故障期间转子电流并兼顾防止直流母线过电压为目的,提出一种“电阻串联电容撬棒保护电路+直流卸荷(Chopper)电路”的综合控制策略。建立在转子侧Crowbar电路电阻串联电容,在直流母线侧加入Chopper电路的改进双馈机组模型,给出Crowbar电路电阻值及串联的电容值的取值方法,并对其控制策略进行分析。在Matlab/Simulink仿真平台上搭建系统模型进行仿真验证,结果表明该低电压综合穿越策略能够有效提升双馈风电机组低电压穿越能力。
Aiming at the problem of low voltage crossing of doubly-fed wind turbine(DFIG),a comprehensive control strategy of the resistor series capacitor crowbar protection circuit with the DC discharge circuit is proposed to overcome the deficiency of traditional crowbar circuit protection,to suppress rotor current during fault and to prevent overvoltage of DC bus.The improved doubly-fed unit model of the chopper circuit is added to the side of the DC bus.The method of determining the resistance value of the crowbar circuit and the capacitance value in series is given,and the control strategy is analyzed.The system model was built on the Matlab/Simulink simulation platform for simulation verification.The results show that the low-voltage comprehensive crossing strategy can effectively improve the low-voltage crossing capability of doubly-fed wind turbine.
作者
朱月洁
郭志
詹仲强
侯继光
李广场
ZHU Yuejie;GUO Zhi;ZHAN Zhongqiang;HOU Jiguang;LI Guangchang(State Grid Xinjiang Electric Power Maintenance Company,Urumqi 830001,China;State Gird Huainan Power Supply Company,Huainan 232000,China;State Grid Xinjiang Electric Power Research Institute,Urumqi 830011,China)
出处
《山东电力技术》
2020年第2期32-36,共5页
Shandong Electric Power
关键词
双馈发电机组
撬棒电路
直流卸荷电路
低电压穿越
控制策略
doubly-fed wind power generator(DFIG)
crowbar circuit
chopper circuit
low voltage ride through
control strategy
