电网电压骤降恢复对双馈风电机组连锁脱网的影响  

Effect of Recovery Stage of Grid Voltage Dip on Cascading Trip-off of DFIG-based Wind Turbines

作　　者：周步祥[1] 董申 林楠[2] 刘舒畅 张冰 赵磊 ZHOU Buxiang;DONG Shen;LIN Nan;LIU Shuchang;ZHANG Bing;ZHAO Lei(School of Electrical Engineering and Information,Sichuan University,Chengdu 610065,China;State Grid Sichuan Electric Power Company,Chengdu 610041,China;Sichuan Electric Power Design ~ Consulting Co.Ltd.,Chengdu 610065,China;Electric Power Research Institute of State Grid Jiangsu Electric Power Co.Ltd.,Nanjing 211103,China)

机构地区：[1]四川大学电气信息学院,四川省成都市610065 [2]国网四川省电力公司,四川省成都市610041 [3]四川电力设计咨询有限责任公司,四川省成都市610065 [4]国网江苏省电力有限公司电力科学研究院,江苏省南京市211103

出　　处：《电力系统自动化》2018年第17期34-41,133,共9页Automation of Electric Power Systems

摘　　要：针对风电低/高电压连锁脱网问题,建立了考虑电网电压骤降恢复阶段的暂态数学模型并对其动态特性进行了分析,详细剖析了该阶段对连锁脱网中高电压穿越过程的影响。电压骤降过程中将会产生定子磁链自由分量,而该分量是考虑电网电压骤降恢复阶段的关键因素。因此,以定子磁链自由分量为切入点,推导出了考虑该阶段的定、转子电流表达式,详细分析并量化了该阶段产生的定子磁链自由分量及不同的故障参数对高电压穿越过程的影响。最后,仿真验证表明了推导的定、转子电流表达式的合理性和暂态模型的正确性。For the low-voltage/high-voltage chain off-grid problems of wind power,this paper develops a transient mathematic model with consideration of recovery stage of grid voltage dip,and analyzes its dynamic characteristics.The effect of the recovery stage on the medium and high voltage ride-through processes in the cascading trip-off fault is analyzed.The free component of the stator flux linkage will be generated during the grid voltage dip,and it is a key factor for the recovery stage of grid voltage dip.Therefore,taking the free component of the stator flux linkage as the entry point,this paper deduces the stator and rotor current expressions with consideration of this stage,and analyzes and quantifies the effect of free components of the stator flux linkage generated and different fault parameters on the high voltage ride-through process.Finally,through simulation and verification,the rationality of the derived stator and rotor current expressions and the correctness of the transient model are verified.

关 键 词：双馈感应发电机 连锁故障 高电压穿越 定子磁链自由分量 转子磁链 故障参数 

分 类 号：TM315[电气工程—电机]