Secondly , the modification function and resonance produced by running power capacitor increased the harmonic at the same time , which worsen the operation environment of itself . it is very important to analyze the reason of harmonic and conduct the valid measure to restrain its affect and guarantee the safely operation of power network . the author has present the point in this paper , based on the operation characteristic of modern power system , the author described the production and development of network harmonic with the consideration on the same kind of problem 本文以现代电力网络的运行特点为基础，结合近年来对所涉及的同类问题的思考，对系统谐波的产生、发展的一般规律进行较为全面的理论阐述；以大量事故案例分析谐波所带来的危害和影响；通过实地测试和对所得数据的分析研究，推导出一种应用matlab的fft的谐波分析方法，给出了该方法的程序流程框图及结果界面显示；在此基础上进一步探讨了利用现代通信网络建立电网谐波网络管理分析系统的总体构想和功能。
This paper summarizes the basic principles and detailed rules of electrical dissecting method for paths between sources and flows , and discusses the problem of basic unit for electrical dissecting method . this paper presents a conclusion that the basic unit of electrical dissecting method for paths between sources and flows should be a union composed by both ac branch and bus instead of simplex branch or bus . and the problem for union of ac branch and bus is analyzed which provides theoretical basis for electrical dissecting method and corresponding applications 在遵循电力网络各种基本电气原理和规律的基础上系统地归纳和总结了电力网络源流路径电气剖分的基本原则及其细则,探讨了交流电力网络源流路径电气剖分的基本单元构成问题,从理论上明确了交流电力网络源流路径电气剖分的基本单元应该是交流支路和节点构成的联合体而不是单纯的交流支路或单纯的节点这一结论,并在此基础上分析了交流支路和节点联合电气剖分所需解决的问题。
However , it is difficult to use existing methods to analyze the detailed electrical supplying relationship accurately especially there are some deficiencies of observing various electrical principles and laws in these methods . so a new method for analyzing the paths between sources and flows is needed to solve these problems 然而,现有的方法还很难做到完全正确分析电力网络源流之间发生的详细电气供求关系,尤其是在遵循电力网络各种基本电气原理和规律方面还存在不同程度的欠缺,发生争议时不容易从理论层面上调和矛盾。
Because the power energy is based on the electric network , the paths between sources and flows reflecting the electrical supplying relationships should be analyzed deeply for assessing how the different sources and flows utilize electric network , and with which the power network expenses can be allocated reasonably and justly without dissension and contradiction 由于电力商品依托于电力网络,只有通过对电力网络源流之间发生电气供求关系的路径进行深入分析,才有可能正确地评估不同网络源流使用电网的具体情况,也才有可能公正合理地分摊电网的费用而不至于引起争议和矛盾。
Optimal power flow is an analyzing and optimizing method of power networks , considering economy and security at the same time . it has been widely applied to secure operation , economic dispatch , energy management and pricing of electric power , etc . with the fast development of power market , the importance of practical uses of opf is standing out increasingly 最优潮流( opf )是一种同时考虑经济性和安全性的电力网络分析和优化方法，在电力系统的安全运行、经济调度、可靠性分析、能量管理以及电力定价等方面得到了广泛的应用。
