文章摘要
马静,刘青,吴佳芳,等.高比例变流型电源并网的输电系统三相短路电流计算[J].电力系统自动化. DOI: 10.7500/AEPS20180106004.
MA Jing,LIU Qing,WU Jiafang, et al.Three-phase short-circuit current calculation for power transmission system with high penetration of converter-type sources[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20180106004.
高比例变流型电源并网的输电系统三相短路电流计算
Three-phase short-circuit current calculation for power transmission system with high penetration of converter-type sources
DOI:10.7500/AEPS20180106004
关键词: 高比例  变流型电源  短路电流  直流分量  冲击电流
KeyWords: high penetration  converter-type source  short-circuit current  DC component  the peak value of short-circuit current
上网日期:2018-11-30
基金项目:国家自然科学基金(51577018);重庆市基础科学与前沿技术研究专项(cstc2015jcyjBX0033)
作者单位E-mail
马静 国网安徽省电力公司经济技术研究院 jfgirl@qq.com 
刘青 国网安徽省电力公司经济技术研究院 jfgirl@qq.com 
吴佳芳 输配电装备及系统安全与新技术国家重点实验室(重庆大学) jfgirl@qq.com 
陈煜 国网安徽省电力公司经济技术研究院 jfgirl@qq.com 
沈玉明 国网安徽省电力公司经济技术研究院 jfgirl@qq.com 
周念成 输配电装备及系统安全与新技术国家重点实验室(重庆大学) jfgirl@qq.com 
摘要:
      高比例变流型电源接入输电系统可能提高系统短路电流水平,导致电力设备选型面临更高的动热稳定要求。本文通过分析变流型电源实验平台的短路电流测试波形的包络线变化规律,获取其三相短路电流表达式;根据变流型电源在故障不同阶段呈现的短路电流输出特性,提出故障暂态和稳态阶段的等值电路;应用叠加定理分别计算含变流型电源电网短路电流交流分量和直流分量,并对冲击电流进行评估,其结果可用于电网规划及设备选型;最后用6节点的500kV淮南电网和35节点的220kV淮宿电网实际算例,将本文方法、常规电压源等值法的计算结果与电磁暂态仿真结果进行对比,验证了本文方法的有效性。
Abstract:
      Short-circuit current level of power transmission system may be increased with high penetration of converter-type sources, and power equipment selection will be faced with higher requirements for dynamic and thermal stability. In this paper, three-phase short-circuit current expression of converter-type sources is obtained by analyzing measured short-circuit current waveform and its envelope line. According to current output characteristics presented by converter-type sources in different period of fault, equivalent circuits of fault transient state and steady state are proposed. In power grid with converter-type sources, superposition theorem is used to calculate AC component and DC component of short-circuit current respectively, then the peak value of short-circuit current is evaluated effectively, and its calculated results can be used for grid planning as well as equipment selection. Finally the calculated results of proposed method and conventional method are compared with electromagnetic transient simulation results through two study cases, then effectiveness of the proposed method is verified.
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