Abstract: In order to reduce the high cost of sampling circuits，simplify commutation procedure and improve

the conversion efficiency of the indirect matrix converter，a zero current commutation model predictive control

（ZCC-MPC）strategy with the input voltage observation was proposed. The input voltage observer was designed by

using the model of the input LC filter，hence，three sampling and conditioning circuits for input phase voltages were canceled. The switching state combination with fixed duty cycle for the inverter stage was adopted in each sampling period，which could ensure the zero DC-bus current during the whole commutation procedure in the rectifier stage.A simple two-step current commutation method was 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 are achieved based on the proposed strategy. As well，the hardware cost is lowered and the IMC commutation reliability is enhanced.

      Key words: indirect matrix converter（IMC）；model predictive control（MPC）；input voltage observer；zero

current commutation