Parallel Operation of Transformer-Based Improved Z-Source Inverter With High Boost and Interleaved Control

Abstract

Owing to the considerable shortage of traditional energy sources, utilization of renewable energy is gaining attention. Thus, the high-voltage inverters for solar and wind power generation systems are in huge demand. Modular inverters are more preferred over singular capacity inverters due to their numerous benefits such as relieving of thermal management, fault tolerance, reduced component stress, and modularity. This article proposes a parallel-configured improved Z-source inverter (ZSI) based on transformer. The proposed circuit has increased voltage gain with the combined benefits of paralleling inverters. Also, it offers lower harmonic distortion and lower filter requirements by employing the interleaved pulsewidth modulation strategy. Two parallel-connected transformer-based improved ZSI is first analyzed in detail, and the similar concept is then applied to N parallel-connected transformer-based improved ZSI. A hardware prototype is implemented in laboratory, and it is tested experimentally for high power applications.