风光电源故障暂态解析及实用化短路电流峰值计算  

Fault Dynamic Behaviors Analysis and Practical Peak Short-circuit Current Calculation of Wind and Solar Power Sources

作　　者：贾科 李英 孔嘉靖 毕天姝 胡薇 刘嘉超 JIA Ke;LI Ying;KONG Jiajing;BI Tianshu;HU Wei;LIU Jiachao(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China;State Grid Qingdao Power Supply Company,Qingdao 266000,Shandong Province,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]国网青岛供电公司,山东省青岛市266000

出　　处：《电网技术》2024年第2期830-838,共9页Power System Technology

摘　　要：研究风光电源的故障暂态过程及短路电流峰值能为设备选型及保护整定提供重要依据。然而,现有的风光电源暂态短路电流计算模型过于依赖参数,计算模型难以满足工程应用需求。因此,该文首先分别对光伏电源、永磁同步风机及双馈感应风机进行故障暂态解析,继而构建形式简洁实用的短路电流峰值表达式。对于光伏电源及永磁同步风机,在恒功率控制阶段建立了基于故障期间电源出力变化的暂态短路电流计算模型;在限幅控制阶段通过分析阻尼比系数,得到短路电流峰值的实用化表达式。对于双馈感应风机,通过分析其故障后定转子磁链的耦合关系,得到Crowbar电阻投入阶段短路电流的简化条件,进而求解出短路电流峰值表达式。最后通过录波数据与仿真数据验证了理论的可行性和正确性。The study of fault dynamic behaviors and the peak short-circuit current of the wind and solar power sources will provide important evidence for rating the power equipment and setting the protective relays.However,the existing calculation methods rely too much on parameters,making it challenging to meet the requirements of engineering applications.To solve this problem,this paper first analyzes the fault dynamic behaviors of the photovoltaic(PV)source,the permanent magnet synchronous generator(PMSG),and the doubly fed induction generator(DFIG).On this basis,the concise and practical expressions of the peak short-circuit current are established.For the PV and PMSG,a transient fault current calculation model based on the power variation is developed in the constant power stage.The peak short-circuit current is calculated by analyzing the damping ratio in the limiting control stage.For the DFIG,the simplified condition of short-circuit current in the crowbar control stage is obtained by analyzing the coupling relation of the fluxes.In this way,the practical expression of the peak short-circuit current is solved.Simulation and test data verify the feasibility and accuracy of the proposed method.

关 键 词：风光电源 故障暂态解析 短路电流计算 短路电流峰值 

分 类 号：TM721[电气工程—电力系统及自动化]