Resonant FCS Predictive Control of Power Converter in Stationary Reference Frame

This paper proposes resonant finite control set (FCS)-predictive control of a two level power converter. In the stationary reference frame, firstly the traditional FCS-predictive control system is shown to be closed-loop feedback proportional control system. In the presence of constraints, the objective function is a weighted error function between the desired optimal and candidate voltage control signals. The weighting coefficient in the objective function is the ratio between the sampling interval and the inductance. Secondly, it is proposed in this paper to design a discrete-time resonant controller for eliminating the sinusoidal error using a cascaded control system structure. The proposed method is simple in design and implementation with an analytical solution for the resonant controller gain. Experimental results are used to demonstrate the efficacy of the proposed approach and much improved closed-loop control performance.