小水电微网并网保护策略研究  

Research on Small Hydropower Station Protection in Parallel with External AC Power Systems

作　　者：张学强 曹明哲 郑文栋 杨耿煌 

机构地区：[1]广东电网有限责任公司茂名供电局,广东茂名525000 [2]天津市信息传感与智能控制重点实验室,天津300222

出　　处：《中国农村水利水电》2015年第9期183-186,共4页China Rural Water and Hydropower

基　　金：广东电网公司科技项目"小水电流域群多点计算技术的自适应式配电线路重合闸关键技术研究及应用科技项目技术"(K-GD2014-1023)

摘　　要：传统的配电网保护是基于对保护对象的单方向电气特征的检测,但是由于在含小水电微网中潮流的双向流动使得该方案可靠性较低。为了适应小水电微网的应用环境,提高保护装置的可靠性和准确性,提出一种新的保护策略,即在含小水电的馈线上采用纵差动保护,在只载有非敏感负荷的馈线上采用反时限过电流保护,以避免传统保护无法适应潮流双向流动的缺点。并通过PSCAD/EMTDC软件进行模型的构建,验证策略的有效性和可行性。The traditional strategy of distribution network protection is only based on the single electrical direction characteristics of the protected targets .However ,because the trend in small hydropower micro grid flows bi-directionally ,this strategy becomes in‐creasingly unreliable .In order to adapt to the new application environment of small hydropower micro grid and improve the protection installations ,reliability and accuracy ,this paper raises a new strategy ：longitudinal differential protection is used in power feeder with small hydropower ,and inverse time over current protection is equipped in power feeder with non-sensitive load only .Therefore ,it is possible to avoid the disadvantages of traditional strategies .Lastly ,a mode is constructed by PSCAD/EMTDC software to test whether the strategy is effective and practicable or not .

关 键 词：小水电 微网并网 反时限过流保护 纵差动保护 PSCAD/EMTDC 

分 类 号：TM773[电气工程—电力系统及自动化]