Finite Control Set Model Predictive Control with an Output Current Observer in the dq-Synchronous Reference Frame for an Uninterruptible Power Supply System

This work focuses on a Finite Control Set Model Predictive Control (FCS-MPC) method for controlling the output voltage of a two-level three-phase power converter with an output LC filter. This type of control has been proven to be a suitable strategy for uninterruptible power supply (UPS) systems, capable of achieving a high quality output voltage with fast dynamic response. In contrast to previously proposed FCS-MPC strategies, the control problem will be formulated and solved in the synchronous dq-frame. Parameters like the output voltage total harmonic distortion (THD) and the root mean square (RMS) error when tracking the reference voltage will be the focus of the analysis when comparing the output quality.