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《Electric Power Automation Equipment》 2018-01
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Reference point selection method in definition of power theory

TIAN Mingxing;WANG Jiangbin;ZHAO Yuanxin;School of Automation and Electrical Engineering ,Lanzhou Jiaotong University;Gansu Province Engineering Laboratory for Rail Transit Electrical Automation ,Lanzhou Jiaotong University;  
The problem of reference point selection in the definition of power theory is very basic but has not got a uniform solution. Firstly,the constraint condition of reference point selection is determined according to the demand of KCL(Kirchhoff's Current Law) which must be meet by the terminal currents of a multiterminal circuit. Secondly,the uniqueness of the reference point selection under the constraint condition is proved,and the unique reference point satisfying the constraint condition is selected from many alternative reference points. Finally,the specific method of reference point selection is given,and the reference point selection method is simplified from the perspective of engineering application. Taking the generalized instantaneous power theory as an example,the proposed method is further explained and its compatibility is discussed,and the current decomposition method and the power definition method employed by the generalized instantaneous power theory are modified to make the power of a specific circuit be a unique determined value.
【Fund】: 国家自然科学基金资助项目(51367010);; 甘肃省科技计划项目(17JR5RA083);; 甘肃省自然科学基金资助项目(1610-RJZA042);; 兰州交通大学优秀科研团队资助项目(201701)~~
【CateGory Index】: TM13
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