Unified power quality conditioner with model predictive control

A unified power quality conditioner (UPQC) using model predictive control (MPC) is proposed for improving power quality in a power distribution system. MPC is applied into UPQC to regulate the supply current and the load voltage to the desired reference signals in spite of the existence of harmonic distortions in the supply voltage and the load current, possible sags or swells in the supply voltage, and variations in the load current. The basic principle, structure and state-space model of the UPQC are firstly introduced. The design of the MPC controller is subsequently analyzed in details. The simulation studies are finally presented to verify the performance of UPQC with MPC.