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《Proceedings of the Csee》 2005-19
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A UNIVERSAL DEFINITION OF POWER BASED ON PERIODIC FUNCTION SPACE

HU Wen-biao, MA Wei-ming (Research Institute of Power Electronic Technique Application of Navy University of Engineering, Wuhan 430033, Hubei Province, China)  
The controversy on power definitions lasts for a long time home and abroad. Some existing power definitions are analyzed in this paper and a universal definition of power for n-phase electric circuits based on periodic function space is proposed. The definition introduces concepts of inner product and norm, and defined the active current vector as the projection from current vector to voltage vector. Then the active power, reactive power, apparent power and power factor are defined. The definition has clear physical meanings and precise mathematic logic, and can be agree with traditional power theory in specific conditions. A new test method of harmonic and reactive current based on the definition is proposed.
【CateGory Index】: TM714
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