Abstract
Two novels switched Z-source inverters (ZSI) based on the active switched capacitor with high voltage conversion ratio are presented. These are active switched capacitor-based capacitor assisted extended boost ZSI and diode assisted extended boost ZSI. High voltage gain is required in various applications such as electric vehicles, grid integration of renewable energy sources, etc. The voltage gain of conventional ZSIs are limited and these conventional ZSI has high voltage conversion ratio at a high duty cycle, which results in poor inversion and poor efficiency. In this work, only one additional diode and one active switch are used with the conventional extended boost ZSI to achieve high voltage conversion ratio without adding any additional passive components. Compared to other ZSI topologies, the proposed inverter also guarantees low voltage across capacitors, a wide range of duty cycle operation and continuous source current in addition to high voltage conversion ratio. The detailed operating principles and steady-state analysis and design details are presented. The performance of the inverters is verified through simulation and also through experiments. Both the simulation and experimental results are presented.
Highlights
DC-DC converter and DC-AC inverter are essential power electronic circuits used in almost all power electronics applications
The hybrid switched techniques is used in the Z –impedance network [19] to enhance voltage conversion ratio. This topology has discontinuous input current profile. This enhanced boost Z-source inverters (ZSI) is based on switched inductor and switched capacitor uses higher number of passive compon-ents compared to DEB-ZSI and CEB-ZSI and conventional ZSI and qZSI
In this paper, two novel active switched-capacitor based extended boost ZSIs namely capacitor assisted active switched-capacitor based extended boost ZSI and diode assisted active switched-capacitor based extended boost ZSI are presented. Both of the topologies are capable of high voltage conversion ratio so it can be effectively used for microgrid, electric vehicle, and renewable energy applications
Summary
DC-DC converter and DC-AC inverter are essential power electronic circuits used in almost all power electronics applications. The above CEB-ZSI and DEB-ZSI have low capacitor voltage stress, continuous input current profile and higher voltage conversion ratio compared to conventional qZSI/ZSI. The hybrid switched techniques is used in the Z –impedance network [19] to enhance voltage conversion ratio This topology has discontinuous input current profile. This enhanced boost ZSI is based on switched inductor and switched capacitor uses higher number of passive compon-ents (has four capacitors, four inductors, and five diodes) compared to DEB-ZSI and CEB-ZSI and conventional ZSI and qZSI. Capacitor, high voltage ratio can be achieved with reduced number of passive components In this manuscript, two novel active switched capacitors based extended-switched boost ZSIs namely, capacitor assisted switched capacitor extended boost-ZSI (CSC-EB-ZSI) and diode assisted switched capacitor extended boost-ZSI (DSC-EB-ZSI) are presented. In the analysis presented in this paper, lower case letters are used to represent the instantaneous values, and upper-case letter are used to indicate the steady state average values
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