A novel ZCC-MPC strategy with the input voltage observation for the induction motor drive system fed by an indirect matrix converter

In order to reduce the high cost of sampling circuits, simplify commutation procedure and improve the conversion efficiency of the indirect matrix converter (IMC), a zero current commutation model predictive control (ZCC-MPC) strategy with the input voltage observation is proposed in this paper. The input voltage observer is designed by using the model of the input LC filter, hence, three sampling and conditioning circuits for input phase voltages have been cancelled. The switching state combination with fixed duty cycle for the inverter stage is adopted in each sampling period, which ensures the zero dc-bus current during the whole commutation procedure in the rectifier stage. A simple two-step zero current commutation (ZCC) method has been adopted instead of complex four-step commutation. Simulation and experimental results show that sinusoidal input/output currents, good steady state/dynamic performance and unity input power factor have been achieved based on the proposed strategy. As well, the hardware cost has been lowered and the commutation reliability has been enhanced.