A Novel FCS-MPC Method of Multi-Level APF Is Proposed to Improve the Power Quality in Renewable Energy Generation Connected to the Grid

When photovoltaic, wind, energy storage batteries, and other new forms of are connected to the grid, power electronic converters needed, there a lot nonlinear devices in grid. The characteristics sustainable generation determine variability intermittency, which will produce harmonic components. Active filters (APF) commonly used industry for compensation, so it is great significance control APF quickly effectively. multi-objective, single-factor, multistep finite set model predictive (FCS-MPC) an proposed this paper suitable multi-level converter control. This method applied three-level structure, changes traditional FCS-MPC method. includes four objectives, stable DC-side voltage, grid currents generated under non-linear loads, balance capacitor voltage on DC side when switching frequency. uses redundant state structure achieve two capacitors side, reduces difficulty target optimisation caused by selection weight factors. Based multi-step prediction, feedback added increase side’s reaction speed, eliminate influence uncertainty, realise better dynamic performance. According simulation results, we can observe that has good followability, compensate harmonics content less than 5%, voltage.