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中文摘要：
为了分析合闸空载电缆对微电网过电压的影响，文中基于PSCAD／EMTDC软件搭建了微电网合闸过电压仿真模型，设计了3种常见类型的微电源：小型同步发电机，基于异步电机的风力发电机组，基于逆变设备的微电源。仿真研究了不同电缆长度、不同微电源类型以及不同运行方式下的过电压水平。仿真结果表明，在电缆长度小于1km范围内，合闸空载电缆过电压超过了4（标幺值），威胁设备绝缘，同时，微电源种类、系统参数以及运行方式对微电网合闸空载电缆过电压也有一定的影响。
英文摘要：
To analyse the impacts of the overvoltage of energizing no-load cable to a microgrid, the simulation model of the microgrid based on PSCAD/EMTDC is designed. This simulation model includes three types of micro-sources, small synchronous generators, wind turbine generators based on asynchronous generators and micro-sources based on inverters. This paper studies the overvoltage level under three kinds of conditions, different cable length, different micro-source types and different system operation models. The results shows that the overvoltage of energizing no-load cable exceeds 4 p.u. when the cable length is less than 1 km, which endangers the insulation of electrified equipments. In addition, the micro-source types, system parameters and operation models have certain influence on the overvoltage.
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