A seven level switched capacitor multilevel inverter with asymmetric input sources for microgrids

S. Raghu Raman, K. W.E. Cheng, Jiefeng Hu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

12 Citations (Scopus)


This paper presents a seven level inverter utilizing switched-capacitor technique. Proposed topology employs two asymmetric DC voltage sources as input and generates a multilevel staircase output. The structure includes a front-end switched-capacitor based DC-DC converter cascaded by a back-end H-bridge inverter. The frontend SC DC-DC converter feeds three DC voltage levels to the H-bridge inverter which produces the corresponding bipolar levels. Such inverters have the potential to be employed in AC microgrids where there are several asymmetric DC sources available. The inverter naturally solves the problem of capacitor voltage balancing as the capacitor is charged to a constant value twice every cycle. This topology also eliminates the need for series connection of individual voltage sources which require voltage balancing algorithms. Simulation and experiment results for the proposed inverter are presented.
Original languageEnglish
Title of host publication2017 20th International Conference on Electrical Machines and Systems, ICEMS 2017
ISBN (Electronic)9781538632468
Publication statusPublished - 2 Oct 2017
Event20th International Conference on Electrical Machines and Systems, ICEMS 2017 - Sydney, Australia
Duration: 11 Aug 201714 Aug 2017


Conference20th International Conference on Electrical Machines and Systems, ICEMS 2017


  • H-bridge
  • High frequency AC power distribution
  • High frequency DC/AC Inverter
  • Multilevel inverter
  • Selective harmonic elimination
  • Switched-capacitor
  • Total harmonic distortion

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Control and Optimization

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