基于极限诱导分岔的电压稳定分析

Voltage Stability Analysis Based on Limit Induced Bifurcation

给出了达到无功越限后,可能出现极限诱导分岔的条件;提出了变量达到输出极限导致极限诱导分岔时,影响系统电压稳定与否的判据;给出了极限诱导分岔影响电压稳定的一种机理解释。极限诱导分岔反映了动态无功源在维持系统电压稳定性中的重要性,并研究了增加无功源对极限诱导分岔的影响。数字仿真结果进一步验证了文中所提出方法和机理解释的正确性。

Limit induced bifurcation （LIB）, which occurs while reactive power output of generators exceeds the limit or output of dynamic reactive power sources is over-limited, is very dangerous to power system voltage stability. The conditions by which LIB may occurs is given while reactive power is over-limited; a criterion to judge whether voltage stability can be maintained is proposed while LIB occurs due to over-limited reactive power, and an explanation on the mechanism of how LIB influencing voltage stability is given. LIB reflects the importance of dynamic reactive power sources in maintaining system voltage stability, so the influence of increasing reactive power source on LIB is researched. The correctness of the proposed method and the given explanation on the mechanism of LIB are verified by results of digital simulation.