Abstract
This article proposes a model predictive control (MPC) with the discrete space vector modulation (DSVM) to reduce input current ripple of three-level Vienna rectifier. The finite control set MPC (FCS-MPC) applied in power converters has variable switching frequency and needs high sampling frequency for better input current quality. With the proposed approach, more feasible vectors can be used to improve the input current's performance with the DSVM using the virtual vectors. The DSVM-MPC features fixed switching frequency and should implement large numbers of virtual vectors with the calculation burden. The improved DSVM-MPC is proposed to optimise the MPC algorithm by selecting the adjacent feasible vectors according to the reference voltage vector trajectory. The effectiveness of the proposed method is verified by the experimental results in a Vienna rectifier platform, which shows that the proposed method possesses better input current performance compared with the FCS-MPC method.
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