Enhancement of power quality disturbances using hybrid power filters

Improvement of power quality (PQ) has became an essential aspect in current situation of power system. Conventionally power quality improvement was done through passive filters, shunt filter and series filter but they suffer from problems like resonance, fixed compensation and other PQ problems. Therefore in order to eradicate these issues some hybrid combination of filters including passive and active power filter (APF) are used. This paper proposes an analysis and comparative study of two different schemes of hybrid active power filter (HAPF). HAPF is configured with the arrangement of series, passive and shunt filter. One arrangement is modeled with shunt passive filter linked in series with shunt active filter and the other is designed with series active filter and shunt passive filter. For both the schemes of hybrid filter, different control strategy and power circuit design are considered. Finally for individual configuration the control and compensation design is proved by simulation.