一种基于加速不平衡功率快速估算的切机敏感点搜寻方法研究  

Research for Sensitive Point Searching Method of Generator Tripping Based on Acceleration Unbalanced Power Fast Estimation

作　　者：刘莹[1] 刘晓宇[1] 余婧峰[1] 张国芳[2] 

机构地区：[1]国网四川省电力公司经济技术研究院,四川成都610041 [2]国网四川省电力公司,四川成都610041

出　　处：《四川电力技术》2015年第5期38-42,共5页Sichuan Electric Power Technology

摘　　要：通过计算绝对动能增量指标可以实现切机敏感点定位。提出根据估算短路故障期间发电机不平衡功率找出切机敏感点的方法。将短路期间的电压分成两部分,一部分是故障前系统潮流,另一部分是故障点等效电动势产生的电压分量。两分量叠加计算出发电机机端电压,再计算出发电机故障期间不平衡功率。根据不平衡功率大小定位切机敏感点。10机39节点系统仿真验证了所换方法的有效性。The sensitive points of generation tripping could be located by absolute kinetic energy incremental index. A method is proposed which is used to locate this point based on the estimation of unbalanced power during short circuit period. The voltage is separated to two parts： one is determined by the pre- fault power flow,the other is determined by the equivalent voltage at the fault point. The voltages of the generators are calculated with superposition principle. Then the unbalanced power of generators could be computed. The sensitive points of generation tripping are determined by this unbalanced power. The effectiveness of the proposed approach is verified by the simulation results of a 10- machine 39- bus system.

关 键 词：能量函数 不平衡功率 叠加定理 敏感点 

分 类 号：TM76[电气工程—电力系统及自动化]