CURRENT DECOMPOSITION BASED ON THE P-Q THEORY CONCEPTS

Autor/autori: Eng. Cristina-Alexandra PATRASCU, PhD. Student, Prof. Eng. Mihaela POPESCU, PhD, Assis. Eng. Vlad SURU, PhD

Rezumat: Lucrarea analizeaza posibilitatile de descompunere a curentului de sarcina deformat, in vederea utilizarii ca si curent de referinta in filtrarea activa, pe baza teoriei p-q. Pe langa descompunerea originala propusa de Akagi, este prezentata si o descompunere modificata. Modelarea si simularea in mediul Matlab/Simulink, pentru doua studii de caz, permit interpretarea rezultatelor. Se arata ca, pentru o compensare totala, obtinerea unui curent activ cu aceeasi forma de unda si in faza cu tensiunea nu este posibila daca in expresia curentului activ apare modulul fazorului spatial al tensiunii.

Cuvinte cheie: teoria p-q, curent activ, tensiune nesinusoidala, puterea aparenta complexa.

Abstract: This paper analyzes the possibilities to decompose the distorted load current based on the p-q theory, in order to be used by the reference compensating current calculation in active filters. Besides the original decomposition proposed by Akagi, a modified decomposition is presented. Modeling and simulation in Matlab/Simulink, for two case studies, allow us to analyze the results. It is shown that, when the total compensation is desired, obtaining an active current with the same shape and phase as the voltage is not possible if the active current expression contains the voltage space vector modulus

Keywords: p-q theory, active current, non-sinusoidal voltage, complex apparent power

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