For example , since different operating points of power system have different stability characteristics , utility engineers often perform a large number of stability studies to search for a stable one by trial - and - error methods incorporating engineering experience 目前各电网调度中心主要采用的试错搜索法结合稳定计算经验来寻找保持暂态稳定的运行方式的方法，现在看来无疑是耗时的和不完善的。
Based on the lyapunov stability theory , this paper analyzes thetransient energy function methods for power system transient stability analysis , and considers the quantitative analysis and fast speed as their advantages , but the unreliability as their limitations 基于李雅普诺夫稳定理论，对用于电力系统暂态稳定分析的暂态能量函数法进行了分析，认为可定量分析和快速性是其独特优势，不可靠性是其局限性。
Recent years , with the development of new technologies , such as the direct method of transient stability analysis and stability control approach based on pmu , online stability assessment and stability control measures has been improved greatly 近年来，随着暂态稳定分析直接法的持续进步和基于gps同步时钟相量量测技术的快速发展都使得电力系统暂态稳定在线评估、失稳预测与稳定控制技术取得了相当的进展。
Obviously , this method is quite time - consuming and imprecise , saying nothing of economy . in order to overcome the difficulty , this paper presents a transient stability optimal design modal through integrating stability constraints into the standard opf formulation 为此，本文通过在标准opf模型中加入暂态稳定约束，提出了一种全新的电力系统暂态稳定优化设计模型，为暂态稳定运行点的确定提供了严格的理论依据。
The trajectory sensitivity can overcome the shortages of the traditional sensitive methods , easily consider the discrete point appearing condition in the system trajectory , and hold high precision , which is fitful for the research of the transient stable analysis 轨迹灵敏度分析能弥补现有灵敏度分析方法的不足之处，可以方便地考虑系统轨迹出现离散点的情形，具有较高的精度，因而十分适于电力系统暂态稳定问题的研究。
