Single‐phase high‐voltage gain switched LC Z‐source inverters

Abstract

Recently, switched-inductor Z-source inverters (SL-ZSIs) have been reported to achieve high-voltage gain and good power inversion operation at low shoot-through duty ratio D as compared to conventional ZSI. As the SL-ZSIs have high passive component count, weight, volume and losses of the system increases that lead to reduction in efficiency. To address the issues of conventional ZSI and SL-ZSIs, two single-phase switched LC (SLC)-ZSIs (Type 1 SLC-ZSI and Type 2 SLC-ZSI) are proposed in this study to achieve high-voltage gains at low values of D with lower passive component count as compared to SL-ZSIs. At low values of D, modulation index M approaches to higher values which results into improved AC output at reduced harmonic distortion. Due to low passive component count in the proposed inverters, weight, volume and losses decreases resulting into increase in efficiency. The proposed inverters can be used in various DC-AC and DC-DC power conversions in renewable energy applications due to their high-voltage gain, better immunity to EMI noise and higher reliability. The detailed steady-state analysis of the two proposed SLC-ZSIs is given in this study. Scaled down experimentation has been carried out to verify the performance of the proposed inverters.

Influence of a Proposed Switching Method on Reliability and Total Harmonic Distortion of the Quasi Z–Source Inverters

“…Figures 12c and 12d present the voltage and current signals on the inductors L 1 and L 2 respectively. These figures can confirm many of the equations especially (6), (7) and (16). Figure 2 presents the state of the output voltage for the Z source inverter in both CCM and DCM working conditions.…”

“…Besides, their reliability is affected due to EMI noise. Some studies have been conducted in investigating the inverters' structures so as to connect to micro-grid applications [2]- [7]. Inverters can be categorized into two structures: isolated and non-isolated structures.…”

Analysis and Design of a Transformerless Boost Inverter for Stand-Alone Photovoltaic Generation Systems

“…The range of modulation ratio m is discussed based on the open-loop condition. According to (8), the d i ′ can be obtained as: (14) Because d i + d i ′<1, the duty cycle d i can be expressed as: According to (7), sinωt i ∈ (0 1), the range of modulation ratio m can be derived as: (16) When the intermediate variable U C1 is represented by an independent variable m. According to (16), the range of modulation ratio m can be derived as: (17)…”

Design for the Interior Permanent Magnet Synchronous Motor Drive System Based on the Z-Source Inverter

“…The Z-Source inverter is a power converter topology proposed in 2003 by Peng Fangzheng of Michigan State University [7]. The inverter can adjust the DC-link voltage and allow the shoot-through state [8][9][10]. The Z-Source network consists of two pairs of symmetrical inductors, capacitors, and an input diode.…”