Reference signal detection for voltage harmonic damping in three-phase systems

摘要

Two cases are considered: harmonic reduction and unbalanced load correction. The paper presents the method of reference signal detection for shunt active power filter control. The parallel filter used for the voltage shape improving in three-phase four wire systems is considered. The signal is detected from voltage harmonics. The method uses the state observer acting in frequency domain. The process needs a few steps of iteration to obtain a compensator current reducing voltage harmonics. The numerical observer acting simultaneously with the system has learning features.