Reference Generation for Shunt Active Power Filters Based on Optimum Filtering Theory

This paper proposes methods for current reference generation for shunt active power filter based on optimum filtering theory. These methods incorporate possible frequency deviation of the fundamental grid frequency. The proposed methods are an extension of a recently proposed synchronization method named Kalman Filter-PLL (KF-PLL). In this paper it is shown that the KF-PLL can also be used to provide the current references for shunt active power filters. It is considered references generation for the following cases: harmonics cancellation, harmonics and displacement power factor correction, harmonics and unbalance compensation and harmonics with unbalance and displacement power factor correction.