Design of an Extendable High Boost Multi-Port Z-Network Converter for Small Power Grid-Connected PV Applications

Abstract

Using the Z-network idea and conventional isolated power converters as its foundation, this article introduces a multi-port converter. This article proposes a topology that is called Multi-Port Z-Network Converter (MPZNC). A grid-connected inverter can include N input sources into a single DC bus using the suggested topology. Bypassing the input and output circuits was another capability it possessed with the boost function. Compared to traditional converters, these one-use fewer parts to integrate various energy sources. Consequently, it has better circuit properties and achieves higher conversion efficiencies. In comparison to the standard Z-Source Converter (ZSC), it improves the input-output voltage transformation ratio and provides a wider voltage control range. The circuit design, operating principle, control mechanism, and simulation data have been presented to prove technically possible. To investigate the suggested MPZNC-fed Single Phase Five Level (SPFL) inverter in the given scenario, a 1.5 kW, 230 V, 50 Hz miniature laboratory study model was created. According to the findings, the suggested converter has an efficiency of around 93% and provides double the amount of boosting time as the standard ZSC converter.

Keywords

• DC-DC converter
• grid-connected connected PV system
• high boost isolated converter
• multi-port Z-netwok converter (MPZNC)
• photovoltaic system
• single phase five level (SPFL) inverter