Improved Voltage Vector Sequences on Model Predictive Control for a Grid Connected Three Phase Voltage Source Inverter

In this paper, improved voltage vector sequences on model predictive control is proposed for a grid connected three-phase voltage source inverter. Two adjacent voltage vectors and zero voltage vectors are utilized in one switching period. Optimal duty cycles for all sectors are calculated. Voltage vector pair with minimum value of the cost function is selected and applied in the next switching period. Voltage vector sequences are arranged similar to the swing patterns generated by the space vector PWM. Thus, minimum number of switching transition and even loss distribution can be achieved. Computer simulation is carried out to validate viablity of the proposed method. The simulation results confirm that the proposed MPC has superior performance compared to the convention MPC.