An active power filter and unbalanced current compensator

This paper presents the synthesis and performance of a shunt active power filter based on the three-phase pulsewidth modulation (PWM) voltage converter connected to the ac mains, Current harmonics and asymmetries caused by nonlinear loads can be compensated, A decoupled system in Park's variables is achieved and so simple controllers with excellent performance can be used, The controllers are implemented directly in the Park's referential, Expressions for the controller's synthesis are derived, Experimental results from a 2-kVA IGBT prototype showing excellent dynamic and steady-state system's performances are presented, The control circuit is implemented with analog and digital electronic circuits, A considerable amount of electronic circuits is needed. The method presented in this paper can also be implemented with a digital signal processor.