This paper presents a multi-function converter (MFC) as a viable solution to improve the power quality. The PWM rectifier (PWMR) operates as a rectifier to supply dc power to its linear or pulsating load and at the same time, operates as a shunt active power filter (APF) to improve the power-factor and to compensate harmonic and unbalanced currents drawn from non linear loads connected on the ac line. A simple control strategy which allows the converter to perform both functions (PWMR-APF) is presented. A Energetic study of the MFC and passive elements selection is analysed Simulation results made by MATLAB/SIMULINK under several loads configurations are presented to show the effectiveness and the reliability of the multi-function system.

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Ahhut-This paper describes different approaches to implement a multi module parallelable three-phase active power fiters (APF'). These approaches are based on power splitting using several identical active fdter modules, or on frequency splitting where each module is dedicated to take car of a specific current harmonic. In this paper, the constraints related to their control hlocb allowing to generate the current reference and to drive gating signals for the IGBTs or GTOs are analysed. A pq algorithm associated with resonant current control lwps (RCC) are successfully used to control the active power fdters. The RCC uses a high dynamic feedback loop with analogy components. For all approaches, the same voltage IP controller is used to regulate the DC bus voltages. Simulation results are presented for a 6KVA load to demonstrate the effectiveness and the performances of the compensation for the proposed approaches.

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