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A Deadbeat Grid-connected Control Strategy of the Single Phase Z/Q-Z Source Inverter

YAN Jing-bin;XU Yong-liang;LIU Dong-xu;TANG Si-wen;WANG Jin-long;School of Electrical and Electronic Engineering,Harbin University of Science and Technology;Suihua Power Supply Bureau of Heilongjiang Electric Power Company;  
In order to improve the efficiency of Z/Q-Z source inverter and output current quality,reduce the harmonic distortion rate of grid-connected current,the control strategy of grid-connected current is applied to the Z/Q-Z source inverter.The deadbeat control is used to realize grid-connection control,The current can track the reference current quickly,realize the single power factor operation,and the digital control of the inverter.Z/Q-Z source grid-connected inverter simulation model is established,and the grid-connected system of Z/Q-Z source inverter is simulated and analyzed to prove the validity and feasibility of the grid-connected control strategy.The simulation results show that the total harmonic distortion rate of the grid-connected current is less than 1%,the quality of grid-connected current is improved,and the capacitor voltage value of Q-Z source inverter is about half order of magnitude smaller than the Z inverter network.Moreover soft start control of the Z/Q-Z source inverter is analyzed,soft start can effectively solve the start impact of the Z source capacitor voltage and inverter bridge voltage.
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