Multilevel inverter for grid interconnection with square wave voltage sources and minimisation of active filter capacity

Yuichi Noge, Mingcong Deng, Mitsuru Miyashita

Research output: Contribution to journalArticlepeer-review

Abstract

This paper proposes an integrated micro-inverter using a multiple-step controlled voltage source and an active filter connected in series. Recently, a micro-inverter based on an isolated resonant DC-DC converter is widely used. A typical micro-inverter can achieve a high efficiency around 97%. In addition, a micro-inverter system can achieve high efficiency of maximum power point tracking (MPPT) thanks to its small photovoltaic area. The proposed circuit is a combination of a multiple-step controlled voltage source, an active filter connected in series and an unfolding circuit. This circuit reduces the power to be converted to 1/8 compared to a conventional inverter. The control strategy for the proposed circuit is also discussed in this paper. Finally, the grid connected operation is verified through circuit simulation.

Original languageEnglish
Pages (from-to)146-153
Number of pages8
JournalInternational Journal of Advanced Mechatronic Systems
Volume9
Issue number3
Publication statusPublished - 2021

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Mechanical Engineering

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