【作者】 卓峻峰；

【导师】 赵冬梅；

【作者基本信息】 华北电力大学（北京） ， 电力系统及其自动化， 2003， 硕士

【摘要】 最优潮流是一类典型的非线性规划问题，最优潮流计算上的困难限制了它在电力系统运行中的应用，在过去的30年中，人们提出了各种优化方法来解决此问题，至今未能取得公认的满意的成果。本文总结了国内外关于最优潮流算法的研究现状，介绍了求解最优潮流的经典算法，现代优化方法以及其它算法，对各类优化方法进行了比较和讨论。本文提出了一种混沌搜索与模糊集理论相结合求解电力系统最优潮流问题的新方法。该方法用模糊集理论将多目标函数和可伸缩约束条件模糊化，把多目标最优潮流问题转化为单目标非线性规划问题；利用混沌变量的随机性、规律性、遍历性进行寻优，克服了基于导数优化方法对于梯度信息的高度依赖性而造成的困难。本文提出了一种复杂函数的混合优化策略，将混沌搜索与单纯形法相结合，首先利用混沌的遍历性特点进行全局搜索，同时为单纯形法生成较好的初始点，然后用单纯形法进行局部优化，避免了单一算法的弱点。更多还原

【Abstract】 Optimal Power Flow (OPF) can be defined as a typical nonlinear programming problem. The computational difficulties in solving the OPF problem have limited its use in power system operations. In the past three decades, various optimization techniques were proposed to solve the problem. But people fail to make the generally acknowledged satisfied achievement so far.This paper has summarized the research in recent advances about the OPF algorithm both at home and abroad, recommended the classical algorithms of OPF, the modern optimization methods and other algorithms. This paper compared and discussed the method of these kinds of optimization.A new method that the chaos optimization combines with fuzzy set was proposed and applied to OPF problems. Object functions and soft constraints of multi-objective OPF problem are modeled using fuzzy sets, and then this multi-objective fuzzy OPF model is reformulated as a single objective non-linear programming problem. Chaotic variables are used in the searching, which takes advantage of their propriety of randomicity, regularity and ergodicity. The method overcomes the difficulties in traditional gradient search. Combining the simplex method with the chaos optimization method, a hybrid optimization strategy is proposed to solve the optimization problems of complex functions. The hybrid optimization strategy utilizes the ergodicity of chaos to find the global optimal solution, at the same time the initial points that are needed in simplex method are formed, then use simplex method to perform local optimization, which avoid the weakness of single method.更多还原