视在阻抗角失步解列判据的改进研究  

Study on the Improvement of Asynchronous Oscillation Criterion Based on Apparent Impedance Angle

作　　者：陈春节[1] 杨秀[1] 顾丹珍[1] 

机构地区：[1]上海电力学院,上海200090

出　　处：《陕西电力》2013年第4期15-19,共5页Shanxi Electric Power

基　　金：国家自然科学基金资助项目(50977055);上海市科委重点科技攻关计划(10dz1203100);曙光计划(10SG51)

摘　　要：基于两机等值系统来分析在失步状态下视在阻抗角的变化特征,并利用视在阻抗角的变化区域来判断系统是否失步。为了避免系统受到大扰动时容易出现错误判断失步振荡周期的情况,利用有功功率过零2次来进行检测;并基于无功功率的原理来确定失步中心是否落在本线路上。通过对2012年华东电网中安徽机组失稳模式进行仿真分析,验证了该判据的正确性。In the out of step condition, the analysis of apparent impedance angle according to the two-machine equivalent system is studied in this paper, and the characteristic of apparent impedance angle is used to distinguish whether the generators are out of step. For overcoming the misjudgment of oscillation period when the system is subjected to large disturbance, whether the active power crossing zero two times is utilized to correctly detect the out of step oscillation period. Moreover, the reactive power is used to distinguish whether the oscillation center lies in this line. Through the simulation and analysis of 2012 Anhui units’model of East China power grid, the correctness of this criterion is verified in this paper.

关 键 词：失步运行 视在阻抗角 振荡周期 振荡中心 有功功率 无功功率 

分 类 号：TM712[电气工程—电力系统及自动化]