In this paper, the operation principle of the Z-source inverter is analysed in detail. According to the characteristics of allowed short¨C shrougt zero state in the Z-source inverter, SPWM control method of the Z-source inverter is obtained by inserting fixed short¨Cshrougt zero state into zero state of SPWM. It is simple and easily implemented in practice. However, in inductive load condition the output voltage and current of Z-source inverter have serious distortion and affect the inverting quality. The cause of this distortion is analysed in detail and an improved SPWM control method is proposed, which can better solve the output voltage and current distortion problem of the Z-source inverter under the condition of inductive load. Matlab simulation results verify that the improved SPWM control method not only eliminates distortion caused by inductive load, but also decreases the switch times and quantities in each cycle. Therefore, it decreases the THD of AC output effectively and improves the efficiency of the inverter, and its theoretical analysis is verified to be effective
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