Steady‐state analysis of high‐voltage gain multiple series Z‐source inverter

Abstract

In this study, a new topology for multiple series Z-source inverter is proposed. The proposed topology only with one dc power source can generate output voltage higher than the conventional converter. This inverter has low voltage stress on capacitors and common ground between the input source and inverter. Also, the proposed topology with soft-start strategy has inherent ability to reduce inrush-current at start-up. First, different operating modes of the proposed inverter are investigated. Then, the voltage and current of elements and also voltage gain of the inverter are extracted. The comparison results of the proposed and conventional topologies show the advantages of the proposed topology. To verify the correctness operation of the proposed topology, the simulation and experimental results are used.

A class of half‐bridge quasi‐Z‐source inverters: Detailed steady‐state analysis in various operating states, design considerations, and derivation of general topology

“…According to (5), voltage across inductors is positive; so current through inductors is linearly increased from its minimum value (i L, min ) to its maximum value (i L, max ). The value of current through inductors is calculated as follows:…”

“…It is noticeable that discussion on size of passive elements requires more precision because of the dependence on various factors. The size of inductors and capacitors usually is directly proportional to their stored energy and their number in the converter 5,39 ; so it is necessary to calculate stored energy in passive elements of the proposed and conventional Z-source inverters in the same conditions. Table 6 contains values of inductances, values of capacitances and values of stored energy in passive elements.…”

“…Conventional half-bridge and full-bridge inverters do not have high voltage gain. 5 The multiple series Z-source inverter uses many impedance networks with merging middle inductors; hence, size of the structure is a big problem. Although conventional full-bridge inverter can generate zero voltage level in output, disadvantage of conventional half-bridge inverter is inability in generating zero voltage level in output.…”

“…To increase voltage gain of series Z-source inverter, multiple series Z-source inverter has been presented in Babaei and Shokati Asl. 5 The multiple series Z-source inverter uses many impedance networks with merging middle inductors; hence, size of the structure is a big problem. To reach high boost factor in the switched-boost inverter, developed structure based on switched-inductor has been presented in Babaei et al 6 Using the additional switch, many diodes and several inductors in the network cause to significant voltage drop in output.…”

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.…”