摘要
为了提高继电保护整定值在线校核的效率,提出按照各支路的重要度对继电保护整定值进行有序校验。部分支路受潮流冲击后易故障,且断开后易引起连锁故障,所以提出利用潮流熵评估支路重要度。利用基于潮流转移熵的指标Q1i评价了支路因故障断开后引发连锁故障的可能性,利用基于潮流分布熵的指标Q2i评价了支路抵抗潮流冲击的能力。采用Q1i、Q2i的乘积对支路重要度进行综合评价。利用IEEE 3机9节点系统上的仿真算例验证了所提方法的正确性。最后为了简化计算过程,提出采用分布系数法计算各支路的潮流变化。
It is proposed to sequentially assess the protection settings according to the importance of branches for improving the efficiency of its online setting assessment. As the branches vulnerable to power flow impact may easily cause fault and induces cascading faults after trip-off,the power flow entropy is thus applied to assess the importance of branch. The possibility of cascading faults induced by the trip-off of faulty branch is assessed by the index Qli based on the power flow transfer entropy and the vulnerability of branch to power flow impact is assessed by the index Q~ based on the power flow distribution entropy. The product of Qll and Qz is thus applied to assess the importance of branch. The simulation for IEEE 3-generator 9-bus system verifies the correctness of the proposed method. The distribution factor method is recommended to simplify the calculation of branch power flow variation.
出处
《电力自动化设备》
EI
CSCD
北大核心
2014年第2期170-174,共5页
Electric Power Automation Equipment
关键词
电力系统
继电保护
整定值
熵
分布熵
转移熵
electric power systems
relay protection
setting
entropy
distribution entropy
transferentropy
