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《Proceedings of the Csee》 2001-09
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WANG Mao hai, LIU Hui jin (Wuhan University School of Electrical Engineering,Wuhan 430072, China)  
Traditional power theory can not be applied to circuits under nonsinusoidal conditions. The now available instantaneous power theories have no clear physical meanings. To solve these problems, this paper presents a definition of instantaneous power which is based on minimizing transmission loss. The mathematical model is given, and its simplified solution is presented. This definition has a distinct physical meaning. It is identical with the traditional power theory when applied to sinusoidal circuit, with Fryze's definition when applied to single phase circuit, and with H.Akagi's definition when applied to three wire three phase circuit. According to this definition, the determination of real and reactive power has a same criterion both in single phase circuit and 3 phase circuit. This paper also presents a broad sense harmonic theory, with which we can judge the non liner degree of the load. This harmonic theory can be unified with the above mentioned power theory.
【CateGory Index】: TM132
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