考虑极限诱导分岔的电压稳定研究

Research on voltage stability analysis of limit induced bifurcation

研究由于电力系统变量限制导致的极限诱导分岔对电压稳定的影响。给出了发生极限诱导分岔可能出现的条件。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,该判据改变了传统上用求解雅克比矩阵特征值的方法来判断电压稳定性,转而用收敛矩阵来判断稳定与否。对极限诱导分岔影响电压稳定进行了机理解释。研究了增大无功源对极限诱导分岔的影响。将提出的判据方法在单机和多机系统上进行了实验,数字仿真算例验证了所提出分析方法和机理解释的正确性和有效性。

Voltage stability affected by limit induced bifurcation （ LIB ） due to power system variables limit is studied. In this paper, the probable condition of emergence of LIB is proposed. When power system variables limit reaches to output limit to result in LIB, the stability criterion for voltage stability is formulated, which judges voltage stability with convergent matrix and changes the traditional method that solves the Jacobi matrix eigenvalues. A mechanism that LIB affects voltage stability is proposed according to the digital simulation. The influence of increasing dynamic reactive source on LIB is studied. The proposed stability criterion method is tested on single machine and multi-machine power system. The results show that the proposed method and mechanism of LIB is correct and effective.