计及保护动作时间协调配合的双馈风电场故障穿越策略  

Fault Ride-through Strategy for Doubly-fed Wind Farms Considering Coordination of Protection Operation Time

作　　者：李斌[1] 张新雨 何佳伟[1] 谢仲润 周博昊 盛亚如 LI Bin;ZHANG Xinyu;HE Jiawei;XIE Zhongrun;ZHOU Bohao;SHENG Yaru(Key Laboratory of Smart Grid of Ministry of Education(Tianjin University),Tianjin 300072,China)

机构地区：[1]智能电网教育部重点实验室(天津大学),天津市300072

出　　处：《电力系统自动化》2023年第24期1-10,共10页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(52207129);天津市自然科学基金资助项目(22JCQNJC01030)。

摘　　要：风电场并网系统在故障清除后产生的暂态过电压使得风电机组脱网的事故频发。其主要原因在于双馈风力发电机(DFIG)及无功补偿装置在故障清除后的无功补偿退出过程中存在响应延时。为此,基于DFIG转子侧换流器、网侧换流器及无功补偿装置的无功补偿极限分析,明确了上述不同设备间的无功补偿分配策略。接着,分析了不同设备在无功补偿期间的动态响应速度,据此提出了计及主后备保护动作时间的无功参考曲线优化设计方法。与现有无功补偿策略相比,该方法能够在保证故障穿越能力的前提下,大幅减小故障恢复期间并网点的暂态过电压。最后,基于实时数字仿真系统搭建仿真模型,通过大量仿真算例充分验证了所提方法的可行性与优越性。The transient overvoltage in the grid-connected system of wind farms after fault clearing causes frequent wind turbine off-grid accidents.The main reason for this is the response delay of doubly-fed induction generator(DFIG)and reactive power compensation device during the withdrawal process of reactive power compensation after fault clearing.Therefore,based on the analysis on the rotor-side converter and grid-side converter of DFIG and the reactive power compensation limit of reactive power compensation device,this paper determines the reactive power compensation allocation strategy among different devices mentioned above.Furthermore,the dynamic response speed of different devices during reactive power compensation is analyzed,and based on this,an optimal design method for reactive power reference curve considering the operation time of main and backup protection is proposed.Compared with the existing reactive power compensation strategies,this method can significantly reduce the transient overvoltage problem at the point of common coupling during fault recovery while ensuring the fault ride-through capability.Finally,a simulation model is built based on a real-time digital simulation system,and the feasibility and superiority of the proposed method are fully verified through a large number of simulation cases.

关 键 词：双馈风力发电机 换流器 故障穿越 协调控制 无功补偿装置 

分 类 号：TM614[电气工程—电力系统及自动化]