Modelling and control of a hybrid power filter to compensate harmonic distortion under unbalanced operation

Abstract

This study presents a model-based controller for a hybrid power filter (HPF) to reduce the current harmonic distortion in a three-phase system for a general operation case considering unbalanced and distorted source voltages and load currents. The HPF comprises an active power filter (APF) grid connected by means of an LC passive filter. This topology is aimed to reduce the current rating handled by the APF, representing a cost effective solution. The controller design is split into two stages, a first one to control the fundamental component of the system dynamics, and to regulate the DC voltage; and a second stage to compensate the harmonic distortion caused by a non-linear load. For this, the harmonic compensation scheme forces the injection of the required harmonic current to the point of common coupling. The proposed scheme keeps the very familiar proportional-resonant control structure. The compensation of the load reactive current is left to the passive filter. Experimental and simulation results are presented to exhibit the benefits of the proposed control solution.

Adaptive Predictive Deadbeat Current Control of Single-Phase Multi-Tuned Shunt Hybrid Active Power Filters

“…In [16], the operation principle of the single-phase HAPF structure and a relatively complicated control system are presented, although, the grid current quality and the THD improvement are not impressive. In [17], the authors proposed modelling of the three-phase three-wire HAPF structure in αβ reference frame and a model-based controller design is described. However, the control structure of [17] is very sensitive to grid frequency changes.…”

“…In [17], the authors proposed modelling of the three-phase three-wire HAPF structure in αβ reference frame and a model-based controller design is described. However, the control structure of [17] is very sensitive to grid frequency changes. In [18], the authors proposed modelling and designing an adaptive selftuned current controller for the single-phase single-tuned shunt HAPF.…”

Suppression factor as evaluation criterion for wide‐frequency filtering equipment

“…Shunt HAPF topology has been used for the mitigation of harmful harmonics by various researchers [14–17]. Due to series LC filter coupling of HAPF, it has some advantages over traditional shunt APF converters [8].…”

Power quality enhancement by hybrid DSTATCOM with improved performance in distribution system

“…In Fujita and Akagi, 5 a hybrid topology with combination of passive filter and active filter is presented, in which the passive filter removes the harmonics and active filter compensates the load reactive power. In Valdez‐Fernandez et al, 6 a hybrid power filter is discussed, which is capable of harmonic compensation under unbalanced operation. But this method requires high value of dc‐link voltage for satisfactory compensation.…”