故障恢复期间新能源多场站系统过电压快速评估方法  

Fast Assessment Method for Overvoltage in Multiple Renewable Energy Station System During Fault Recovery Process

作　　者：刘昕宇 史兴华 辛焕海[1] 郑迪 高晖胜 倪秋龙 LIU Xinyu;SHI Xinghua;XIN Huanhai;ZHENG Di;GAO Huisheng;NI Qiulong(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310007,China;College of Mechanical and Electrical Engineering,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]国网浙江省电力有限公司,浙江省杭州市310007 [3]中国计量大学机电工程学院,浙江省杭州市310018

出　　处：《电力系统自动化》2023年第13期168-175,共8页Automation of Electric Power Systems

基　　金：国家电网有限公司科技项目(5108-202218280A-2-436-XG)。

摘　　要：新能源多场站系统故障恢复期间的过电压问题严重制约了新能源的消纳和发展,然而,现有研究难以高效评估大规模系统的过电压风险。为此,从新能源场站过电压机理出发,提出了一种考虑换流器过流能力限制的过电压风险快速量化方法。首先,基于新能源多场站系统的过电压机理,建立了故障恢复期间的新能源场站等效模型。在充分考虑故障后变流器限流环节的影响及新能源机组间相互作用后,推导出了新能源多场站系统过电压的评估方法。针对大规模系统最严重过电压工况难以确定的问题,提出了网络薄弱环节快速搜索方法。算例结果表明,所提方法可有效评估新能源多场站系统过电压风险及系统的安全裕度。The overvoltage problem during fault recovery process of the multiple renewable energy station system(MRESS)seriously restricts the consumption and development of the renewable energy.However,the existing research is difficult to efficiently evaluate the overvoltage risk of large-scale systems.Therefore,starting from the overvoltage mechanism of renewable energy stations,this paper proposes a method to fast quantify the overvoltage risk of the MRESS considering the limitation of overcurrent capability of converters.Firstly,based on the overvoltage mechanism of the MRESS,an equivalent model of renewable energy stations during fault recovery is established.After fully considering the influence of current limiting link for converters after fault and the interaction between renewable energy generators,an evaluation method for overvoltage of the MRESS is derived.To solve the problem that it is difficult to determine the most serious overvoltage condition of large-scale power systems,a fast searching method for weak nodes of the network is proposed.Simulation results show that the proposed method can effectively evaluate the overvoltage risk and safety margin of the MRESS.

关 键 词：新能源多场站系统 故障恢复 过电压 过流能力 等效模型 快速搜索方法 

分 类 号：TM86[电气工程—高电压与绝缘技术]