TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
A New Interpretation of the Phasor Theory on Powers under Non-Sinusoidal Current
(O nouă interpretare a teoriei fazoriale a puterilor în curent nesinusoidal)
Vol LVIII • No. 2bis/2006
Alexandru Bitoleanu, Mihaela Popescu
University of Craiova, Electromechanical Faculty, Romania
e-mail: abitoleanu@em.ucv.ro;mpopescu@em.ucv.ro

 Keywords   powers components, distortion powe, rectifier driving system.

 Abstract
This paper is aimed to finding the corelation between the instantaneous complex powers components and the steady state powers under non-sinusoidal current (apparent power, active power, reactive power and distortion power). So, to ascertain that compensating of alternative parts of instantaneous active and reactive powers establishes a sinusoidal current in the parallel active filter using. The mathematical demonstration is found. Also, definitions for apparent power, distortion power and complex instantaneous distortion power are introduced. These definitions verify the orthogonal condition of active, reactive and distortion powers. The DC motor and full control rectifier driving system is used as study case.

 Rezumat
Lucrarea şi-a propus găsirea unor relaţii între componentele puterii complexe instantanee în regim ne sinusoidal şi puterile aparentă, activă, reactivă şi deformantă. Se arată, prin simulare şi analitic, că, în cazul unui filtru activ paralel, prin compensarea componentelor alternative ale puterilor instantanee activă şi reactivă, curentul absorbit de la reţea devine sinusoidal. De asemenea, se propun definiţii pentru puterea aparentă, puterea deformantă şi puterea deformantă complexă instantanee şi se regăsesc expresiile cunoscute, în funcţie de componentele armonice. Aceste definiţii verifică şi condiţia de ortogonalitate a puterilor introdusă de C. Budeanu. Un sistem de acţionare cu motor de c.c. şi redresor trifazat complet comandat este utilizat ca şi studiu de caz.



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