Abstract:  The slow respond of the inverter PV grid system based on traditional switching function model affects the power quality feed into the grid. To solve this problem and improve the power quality of the inverter, after analyzing the PV grid-connected inverter confounding characteristics, by introducing logical variables for the inverter switching dynamics, the MLD model of the system was built. A predictive control strategy was proposed based on this kind of model. The comparison of simulation results show that the predictive control algorithm on the MLD model can improve the dynamic performance of the system, reduce the time of the system meeting the requirement of the grid, verify the feasibility of the proposed method.

Key words:  PV grid-connected inverter； MLD, model predictive control