分布式小水电对配电网自动控制装置的影响研究

Study on Influence of Distributed Small Hydropower on Automatic Control Device of Distribution Network

针对分布式小水电接入配电系统对网络自动控制装置的影响进行了定性和仿真分析,并讨论了解决方法。结果表明,分布式小水电的接入改变了配电网的拓扑结构和潮流方向,当某段线路发生瞬时性故障时会引起自动重合闸的重合失败而导致停电延续;当系统发生故障掉电时,备自投装置则因小水电机组强励对母线电压的支撑作用而发生误动或拒动。通过分析研究,提出了能够适应有分布式小水电存在的配电网自动重合闸及备自投装置的技术改进措施,以提高电网的安全稳定性和供电可靠性。

Abstract： Qualitative and simulation analysis is conducted aiming at the impact of the distributed small hydropower access power distrbution system on network automatic control device, and the solution is discussed. The results show that the dislributed access of small hydropower changes the topology sa-ucaue and aend direction of the distribution network, when some path generates instantaneous failure, coincidence failure of automatic reclosing can be caused, thereby generating continuous power-cut, when the system fails to generate power-down, the standby cast device can generate error movement or refused movement due to the supporting effect of the small hydropower unit slrong excitation on the bus voltage. Through analysis and study, the technology improvement measures capable of adapting to distribution network automatic reclosing and standby casting devices with distributed small hydropower are proposed, thereby improving the security, stability and power supply reliability of the power grid.