说明：  To provide high power quality at the Point of Common Coupling (PCC) of power distribution systems, elimination of the harmonic is indispensably necessary. Most have defined the power quality and given some harmonic limits. Different methods are proposed in literature for solving the harmonic problems. One of these methods, the Active Power Filters (APFs) technique has been studied and developed in the recent years to solve the harmonic problems. The main objective of this paper is to model a new