基于扩展最优潮流模型的无功优化方法

摘要

In order to unify the two models of optimal power flow (OPF) and reactive power optimization (RPO)so that the extended OPF model has broader applicability and add new function for solving RPO problem in the free software based on MATLAB, the equivalent conditions between OPF and RPO models were demonstrated and corresponding approaches were proposed in the paper. Two often used objective functions of RPO, which were the minimum power loss and the minimum annual operating cost, were considered in the study. Two examples of RPO, which objective functions were minimum power loss and minimum annual operating costs respectively, were calculated and compared with existing results. Thus the effectiveness and the practicality of the proposed methods were verified. Further application on the IEEE 33 nodes showed that the methods could make full use of optimization in existing software to solve RPO problem. The software development cost is decreased while adding functions and improving its reliability.%为了将最优潮流与无功优化两种数学模型统一起来，使形成的扩展最优潮流具有更广泛的适用性，并增加基于MATLAB的电力系统分析自由软件求解无功优化问题的功能，针对目标函数为网损最小和年运行费用最小的无功优化问题，论证了最优潮流模型与这两种无功优化模型等效的条件，并提出了相应的处理方法。应用该优化方法对两个算例分别进行网损最小和年运行费用最小的无功优化计算，并和已有结果进行对比，验证了方法的有效性和实用性。进而应用本研究方法对IEEE-33节点系统进行优化计算，结果表明：该方法可以充分利用现有软件在优化分析方面的优点解决无功优化问题，增加软件功能的同时既减少了开发成本，又提高了可靠性。