THREE-PHASE ACTIVE FILTERING SYSTEM UNDER NONSINUSOIDAL VOLTAGE CONDITIONS

Autor/autori: Mihaela POPESCU, Alexandru BITOLEANU

Rezumat: In aceasta lucrare, sunt analizate modificarile necesare in circuitul de control al unui filtru activ paralel trifazat pentru functionarea in conditii de tensiune de alimentare nesinusoidala. Sunt avute in vedere doua strategii de compensare, respectiv obtinerea unui factor de putere unitar si eliminarea totala a distorsiunii armonice a curentului absorbit din retea. Calculul curentului de referinta presupune generarea curentului dorit in retea dupa compensare si este bazat pe conceptele teoriei p-q a puterilor. Este propusa si o modificare a circuitului de calare pe faza fundamentalei, necesar in implementarea celei de-a doua strategii. Rezultatele obtinute prin simulare valideaza abordarile teoretice.

Cuvinte cheie: filtre de putere, control in cascada, compensare, controlul curentului, distorsiune armonica.

Abstract: This paper is focused on the improvements to me made in the control circuit of a three-phase shunt active power filter system for a proper operation under nonsinusoidal voltage conditions. Two compensation strategies are taken in consideration, leading to a unity power factor and, respectively, to the perfect harmonic cancellation of the supply current. The reference current calculation involves the generation of the desired supply current after compensation and it is based on the specific concepts of the p-q theory of the powers. In addition, an improvement in the phase-locked loop circuit is proposed for a proper implementation of the second strategy. The simulation results validate the theoretical approaches

Keywords: active filters, cascade control, compensation, current control, harmonic distortion

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