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Uniform Mathematical Description of Instantaneous Reactive Power Theory and Conventional Power Theory and Its Physical Meaning

Liu Jinjun Wang Zhaoan(Xi′an Jiaotong University)  
This paper makes detail analysis on the relationship between instantaneous reactive power theory and conventional power theory in three phase circuits.The analysis is based on the natural extension of the concepts in conventional power theory,such as effective value,phase angle difference,active power and reactive power,to the concepts of instantaneous value.Through this extension,the uniform mathematical description of the instantaneous reactive power and conventional power is established.The physical meaning of the instantaneous reactive power theory is explicitly explained,and the relationship between the two power theories is clearly revealed,both in the aid of a profound understanding of the uniform mathematical description.
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