Dual Unified Power Quality Conditioner with Proportional-Resonant Controller

Abstract

The Unified Power Quality Conditioner (UPQC) is an equipment that simultaneously mitigates voltage and current disturbances. It is formed by two active filters in a back-to-back configuration with a series connection to the grid by one of the converters, and the other is shunt-connected. Many researchers explore its control system using different strategies based on different theories. This paper presents the dual approach of the UPQC with proportional-resonant (PR) controllers substituting proportional-integral (PI) controllers. The use of this type of controller does not require mathematical tools to make the signal constant, such as the Park transformation, to make the tracking error zero in a steady state, which reduces the computational effort in real-time processing. Software simulations are done to validate the performance of the Dual UPQC with PR controllers. Comparisons with the PI strategy are presented as well.