Abstract
This article presents an alternative finite control set model predictive control (FCS-MPC) implementation to reduce the input current ripple of a two-level three-phase grid-connected rectifier. With the proposed approach, an improvement in the input current ripple is obtained by integrating the virtual vectors in the conventional FCS-MPC structure. The synthesis of the virtual vector is conceptualised from the discrete space vector modulation approach which combines several switching states during the sampling period to create new virtual voltage vectors. However, with this approach, the number of voltage vectors becomes higher, making it challenging to implement this algorithm in a standard control platform. To overcome this problem, a two-stage optimisation method is proposed to optimise the voltage vector selection process, avoiding evaluating all the feasible voltage vectors without any performance sacrifice. Experimental results are presented; showing that the proposed technique provides lower input current ripple compared to the conventional FCS-MPC with an acceptable computational effort.
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