Simplified Double-vector Finite Control Set Model Predictive Control for LCL-filtered T-type Inverters with Active Damping

The conventional model predictive control (MPC) suffers from high complexity of implementation and large output current ripples. In this article, a simplified double-vector finite control set MPC (FCS-MPC) method with active damping is proposed for three-level T-type (3LT2) inverters with LCL filter. First, the predictive model with active damping method is derived. Second, to reduce computation burden, a phase-to-line voltage coordinate algorithm is adopted. Furthermore, the vector space where reference voltage locates is simplified from three-level space to two-level space. Third, a geometry-based technique is used to select two optimized candidate vectors and calculate duty cycles. The proposed strategy not only enhances the portability of the conventional FCS-MPC method, but also reduces the harmonic components induced by LCL filter. In the end, simulations are performed to validate the effectiveness of the proposed strategy.