Abstract
The conventional single-phase quasi-Z-source (QZS) inverter has a high leakage current as it is connected to the grid. To address this problem, this paper proposes a transformerless QZS inverter, which can reduce the leakage current for single-phase grid-tied applications. The proposed inverter effectively alleviates the leakage current problem by removing high-frequency components for the common-mode voltage. The operation principle of the proposed inverter is described together with its control strategy. A control scheme is presented for regulating the DC-link voltage and the grid current. A 1.0 kW prototype inverter was designed and tested to verify the performance of the proposed inverter. Silicon carbide (SiC) power devices were applied to the proposed inverter to increase the power efficiency. The experimental results showed that the proposed inverter achieved high performance for leakage current reduction and power efficiency improvement.
Highlights
Quasi-Z-source (QZS) inverters have been widely used for grid-tied applications, due to their advantages over the traditional voltage-source inverters (VSIs) using a DC-DC converter [1,2,3,4,5,6,7]
A high-efficiency transformerless QZS inverter was proposed for single-phase grid-tied
A bidirectional switch operating with the grid frequency was used, which provided a current path to remove high-frequency components for the common-mode voltage
Summary
Quasi-Z-source (QZS) inverters have been widely used for grid-tied applications, due to their advantages over the traditional voltage-source inverters (VSIs) using a DC-DC converter [1,2,3,4,5,6,7]. It has a QZS circuit (L1 , L2 , C1 , C2 , D1 ) and a full-bridge inverter (S1 , S2 , S3 , S4 , L3 , L4 ). Due to shoot-through states, the common-mode voltage in the QZS inverter can be higher than that in the conventional VSIs [7]. This leads to a higher leakage current, which decreases the power efficiency of the inverter
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