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Compared to Z-source inverter, the switched-inductor quasi-Z-source inverter (SL-qZSI) provides a higher dc-link voltage while remaining the continuous input current and a common ground with the dc source. In some new energy power generation systems, the input voltage is environmental affected and sometimes is too low, thus the boost ability of SL-qZSI may be still not enough. By just replace one...
Coupled inductor based high set-up quasi-Z-source inverters with continuous input current (CL-qZSI), can get a higher boost ratio compared to Z-source inverters. Topology derivation and operating principle of CL-qZSI are analyzed in details. From comparison of voltage stress of passive components, influence of turn ratio and duty cycle on the boost factor and comparison of volume of coupled inductor,...
This paper presents a grid-tied PV system based on the series Z-source inverter. The grid-tied current control strategy, the dc-link voltage control as well as the Maximum Power Point Tracking scheme is realized in the single-stage system. The current control strategy is performed based on dq rotating frame. Indirect dc-link control is adopted to achieve constant peak dc-link voltage and thus can...
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