Abstract
Impedance source converters as single-stage power conversion alternatives can boost and regulate the output voltages of renewable energy sources. Nevertheless, they, also known as Z-source inverters (ZSIs), still suffer from limited voltage gains and higher stresses across the components. To tackle such issues, extra diodes, passive components, and active switches can be utilized in the basic ZSIs. In this paper, a modified switched-quasi-Z-source inverter (S-qZSI) is proposed, which features continuous input currents and high boosting capability to boost output voltage by minor modifications of a prior-art topology. Furthermore, the voltage stress of the active switches is reduced, which contributes to a lower cost. The operation principles are discussed comprehensively. The performance of the proposed ZSI in terms of conversion ratio, voltage gain, and stresses on the power switches and capacitors is benchmarked with selected ZSIs. Finally, simulations and experimental tests substantiate the theoretical analysis and superior performance.
Highlights
Impedance source converters have gone through rapid development in the last few decades since the first Z-source inverter (ZSI) proposed by Peng in [1]
This paper proposes a modified qZSI with a switched-boost network (S-qZSI), which can achieve continuous input currents and higher boost capability compared with selected switched-boost inverters and modified ZSIs
The control signals applied in the proposed switched-quasi-Z-source inverter (S-qZSI) are generated from a digital signal processor (DSP)
Summary
Impedance source converters have gone through rapid development in the last few decades since the first Z-source inverter (ZSI) proposed by Peng in [1]. The power switches of the VSI may be damaged if the inverter leg is short-circuited due to wrong drive signals To address these issues, the Z-source network, as shown, which features buck-boost characteristics, can be adopted. A diode-assisted SBI (DA-SBI) was proposed in [16] This modified topology is a combination of the SBI and diode-assisted network, which provides a high voltage gain and continuous input currents. The modified topology quasi-ZSI with continuous input current (CC-qZSI) in [17] shows the improved boost capabilities and less voltage stresses by adding a switched boost network to the original qZSI. This paper proposes a modified qZSI with a switched-boost network (S-qZSI), which can achieve continuous input currents and higher boost capability compared with selected switched-boost inverters and modified ZSIs. The rest of this paper is organized as follows.
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