The new and precise control base on Z-source inverter

This article in-depth analyzes the control character of the Z-source inverter in photovoltaic power generation system. According to these problems of the dynamic performance of the Z-source inverter output and boosting controlling strategy lead to double switched frequency etc. A new improved boosting modulation strategy is presented. Based on SVPWM, changing turning on or off time of the same bridge switches to insert 6 shoot-through states in the single-cycle of traditional zero vector. Compared with the conventional boosting modulation strategy, the modulation is not only to stabilize the output performance of Z source inverter in a certain extent, and can effectively reduce the switching frequency. In addition, According to inaccurate problem of inserting the shoot-through time for traditional modulation strategy, this article presents the strategy to control accurately the shoot-through time through the slope of the modulation signal, to make Z -source inverter more controllable. These advantages of improved precision boosting modulation strategy are verified by simulation and experiment.