摘要
交直流系统发生直流闭锁故障与三相短路故障时,系统送端母线会产生暂态过电压。为此,提出了一种利用系统短路比推导的暂态过电压评估指标。首先,分析了送端母线过电压机理,推导出系统发生故障后送端母线暂态过电压的计算方法,结合系统短路比提出了过电压评价指标;其次,分析利用过电压评价指标,量化评估交直流系统发生故障后送端母线暂态过电压幅度。最后,利用某实际电网数据验证了所提指标的有效性,利用该指标可衡量交直流系统送端母线处暂态过电压水平。
Transient overvoltage will occur on the bus of AC/DC sending-end system when DC blocking fault and three-phase short circuit fault occur in the system.Therefore,the paper proposes a transient overvoltage evaluation index derived from the short-circuit ratio of the system.Firstly,the mechanism of bus overvoltage at the sending-end is analyzed,the calculation method of the bus transient overvoltage after the fault occurs is deduced,and the evaluation index of the overvoltage is put forward combined with the short-circuit ratio of the system.Then the evaluation index is used to make a quantitative assessment of the transient overvoltage amplitude of the bus after the fault occurs in the AC/DC sending-end system.Finally,the validity of the index is verified by using the actual power grid data,and the transient overvoltage level of the bus of the AC/DC sending-end system can be determined with the index.
作者
王宇鹏
蒋哲
武诚
李新
WANG Yupeng;JIANG Zhe;WU Cheng;LI Xin(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology of Ministry of Education,Northeast Electric Power University,Jilin 132012,China;State Grid Shandong Electric Power Research Institute,Jinan 250003,China;State Grid Shandong Electric Power Company,Jinan 250001,China)
出处
《智慧电力》
北大核心
2023年第12期8-14,22,共8页
Smart Power
基金
国家重点研发计划资助项目(2021YFB2400800)
国家电网有限公司科技项目(SGSDDK00WJJS2200092)。
关键词
交直流系统
短路比
送端暂态过电压
评估指标
AC-DC system
short-circuit ratio
transient overvoltage in sending-end system
evaluation index
