基于PMU量测信息的电压稳定在线评估指标  

An online voltage stability index based on measuring information of phasor measurement unit

作　　者：董雷 张昭 蒲天骄[2] 于汀[2] 韩巍[2] 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]中国电力科学研究院,北京100192

出　　处：《电力系统保护与控制》2015年第11期1-6,共6页Power System Protection and Control

基　　金：国家电网公司基础性前瞻性科技项目(DZ71-14-006)

摘　　要：为实现对电压稳定的实时在线监测,亟需研究具有良好精确度、线性度和计算快速性的电压稳定在线评估指标,为此提出一种新的基于支路电压方程可行解域的静态电压稳定Lu指标。该指标可由PMU的局部量测信息快速计算获得。进而,为了消除冗余量测信息对指标精确度的影响,提出了仅利用PMU电压量测信息的Lu改进指标Lu.pro。最后,通过仿真算例验证了Lu及Lu.pro指标具有很好的准确性和线性度,并进一步验证了Lu.pro指标在三相不对称情况下的适用性和有效性。结果表明,Lu指标以及改进的Lu.pro指标能够反映系统中电压稳定的薄弱节点及区域,适用于电压稳定的在线监测与评估。To realize online monitoring of system voltage stability, it is in urgent need of proposing a voltage stability index with ideal accuracy, linearity and computation speed. This paper proposes a new voltage stability index ofLu based on the feasible solution domain of branch voltage equation which can be fast calculated using the local measurement information of PMU. Moreover, in order to eliminate the error produced by redundant measurement information, the improved indexLu.pro is proposed which can be calculated merely with the voltage measurement information of PMU. Simulations are made to prove thatLu andLu.pro are ideal voltage stability indexes with good accuracy and linearity. Furthermore, it is also demonstrated by simulations thatLu.procan be used to evaluate the voltage stability of three-phase unbalanced system. Simulation results show that indexes ofLu andLu.pro can indicate the weak nodes and areas of voltage stability which can be used in online monitoring and evaluation of voltage stability.

关 键 词：电压稳定性 电压稳定指标 在线监测 同步向量测量单元 不对称系统 

分 类 号：TM712[电气工程—电力系统及自动化]