An adaptive dead-time compensation method for sinusoidal PWM-controlled voltage source inverter with output LC filter

A novel dead-time compensation method for voltage source inverter (VSI) with output LC filter is proposed. The analysis shows that the dead-time effect is eliminated at most zero-crossing zone of the inductor current, if the zero current clamp phenomenon is ignored. Conventional dead time compensation isn't suitable owing to the fact the dead-time compensation is needless in zero-crossing zone for VSI with LC filter. The proposed dead-time compensation method is based on adjusting promptly the compensation voltage in accordance with the situations of inductor current in theory. However, it is difficulties to determine seven situations around the zero current clamping (ZCC), as the seven situations of inductor current are variable with change of the load current, DC voltage. Thus, an improved inductor current detecting method with high precision is presented, which estimates the inductor current by detecting load current instead of inductor current. Therefore, the proposed dead-time compensation method is based on compensation voltage according to the three zones (positive zone, zero-crossing zone, and negative zone) of estimated inductor current in practice. The simulation and experiment results show the validity of the analysis and the effectiveness of the proposed dead-time compensation.