鞍结分岔与极限诱导分岔的电压稳定性评估

VOLTAGE STABILITY ASSESSMENT FOR SADDLE NODE BIFURCATION AND LIMIT INDUCED BIFURCATION

提出了一个改进的约束优化方法来计算电压稳定性评估指标——负荷裕度,并以此来评估新型的电压崩溃现象——极限诱导分岔和传统的鞍结分岔。为了和现有的一些电压评估算法保持一致性,发电机无功极限约束被引进到了优化问题的约束条件中,并以此来判定无功/电压约束转换点和判断系统的电压崩溃类型。针对不同的系统模型,文中给出了各个系统的电压崩溃类型和负荷裕度。算法的有效性通过IEEE30,57,118母线系统、西日本(West-J)27母线系统和1个1047母线系统模型的仿真的得到了验证。该方法可有效地应用于电力系统电压稳定分析与评估领域。

An improved method for the voltage stability assessment index——load power margin is proposed as an constrained optimization method with respect to a new type of bifurcation, Limit Induced Bifurcation （LIB） in addition to a common type, Saddle Node Bifurcation （SNB）. Paying attention to a consistency with the existing methods for voltage stability assessment, a reactive power limit of generator is investigated to constitute a model for the optimization problem. Then, a fast solution method is developed using a primal-dual interior point method. The load power margin is discussed based on the comparison with the solutions by different existing methods. The effectiveness of the proposed method is demonstrated through IEEE 30, 57, 118 bus systems, West-Japanese 27 system of Japan and 1047 bus test system. This method can be effectively used in the field of voltage stability analysis and assessment in the power system.