摘要
Abstract
On-line steady state voltage stability indices based on wide area measurement system (WAMS) are summarized and compared. Based on theoretical analysis, the theoretical defects and usage limitations of these indices are pointed out. Utilizing synchronously measured electric quantities such as bus voltage phasors and line power flows and according to the comparison results of voltage levels, which are calculated by power flow and voltage equations of transmission line, at both terminals oftransmission lines, a new voltage stability index Ivs is proposed to indicate the voltage stability condition of monitored bus or transmission line. By means of system equivalence, the coupling of line voltage in multi-machine power system is decoupled, thus the proposed voltage stability index can be applied to multi-machine power system. Simulation results fiom single-machine single-load system and IEEE 14-bus system show that voltage stability condition of transmission line can be rapidly judged and the voltage instability point can be predicted by the proposed index IVS, and the proposed index is suitable to all kinds of transmission lines. Comparison of the proposed voltage stability index with previous steady state voltage stability indices show that the proposed voltage stability index possesses following advantages: needing not judge the line resistance, clear physical conception, wide application range and satisfied linearity and so on. Utilizing the proposed index is favorable to implement of on-line monitoring and assessment of voltage stability.关键词
广域测量系统/在线监测/电压稳定指标/系统等效/指标比较/电压稳定仿真Key words
wide area measurement system (WAMS)/ on-line monitoring/ voltage stability index/ power system equivalence/ index comparison/ voltage stability simulation分类
信息技术与安全科学
