Low-Complexity Model Predictive Control of AC/DC Converter With Constant Switching Frequency

Conventional finite-control-set model predictive control (FCS-MPC) and low-complexity MPC (LC-MPC) may cause variable switching frequency and high sampling frequency. To address these concerns, a new LC-MPC scheme with a constant switching frequency has been proposed in this paper, the virtual voltage vector generated by two adjacent effective vectors applied to decrease the power control error. The scheme has been tested for power control of an AC/DC converter. Simulation and experimental results obtained have shown that the scheme generates smaller (near zero) power control error per switching period, and have a faster dynamic response and a constant switching frequency. These features have been attained without demanding for an excessively high sampling frequency. Finally, the comparison with the conventional methods is carried out in this paper, the advantages of the proposed method have been clearly illustrated.