Abstract
Power quality has become a major issue in electrical systems. Power quality improvement like harmonic compensation is mostly done using Hybrid Active Power Filter (HAPF). In conventional hybrid active power filter (series LC type) the reduction of DC voltage is based on the amount of inductive load present at the point of common coupling (PCC). If the load pattern varies the DC bus voltage requirement will be variable in conventional structures and compact inverter with reduced voltage rating can not be selected for the application. In this paper, a control strategy has been proposed that enables hybrid active filter to compensate harmonics with reduced DC bus voltages for any inductive/harmonic loading. DC Bus voltage reduction is achieved by an intentional reactive current injection from the inverter and such injection is required only when there is no or minimum inductive load at the PCC. Moreover, a fixed margin controller has been proposed for a general loading condition. The fixed margin controller keeps the maximum value of the modulation signal at a desired value. This allows the compensator to compensate higher magnitude of harmonics at reduced DC bus voltage. The proposed control scheme has been verified through detailed simulation studies and analysis.
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