Common-ground transformerless inverter for solar photovoltaic module

Saad Ul Hasan, Benjamin Shaffer, Hassan A. Hassan, Mark J. Scott, Yam Siwakoti, Graham E. Town

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

16 Citations (Scopus)


This paper presents a new single-phase transformerless inverter providing common ground for grid-connected photovoltaic (PV) systems. It consists of 5 switches, one diode, one capacitor, one small inductor and a small filter at the output stage. A simple Unipolar Sinusoidal Pulse-Width Modulation (SPWM) technique is used to operate the proposed inverter to minimize losses, output current ripple, filter requirements and improve its electromagnetic compatibility (EMC). The proposed topology shares a common ground with the grid and a capacitor is utilized as a virtual DC bus to provide the negative power cycle of the inverter. The capacitor is charged regardless of any switching cycle using a dedicated switch which can in turn reduce the size of capacitor in relation to the switching frequency. The peak ac output voltage is equal to the input DC voltage which reduces the requirement of the high input DC voltages. Simulation and experimental results for a 1 kW prototype are presented to demonstrate the usefulness of the proposed topology.

Original languageEnglish
Title of host publicationThe 2018 IEEE Applied Power Electronics Conference and Exposition (APEC) proceedings
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages6
ISBN (Electronic)9781538611807, 9781538611791
ISBN (Print)9781538611814
Publication statusPublished - 2018
Event33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018 - San Antonio, United States
Duration: 4 Mar 20188 Mar 2018

Publication series

ISSN (Electronic)2470-6647


Conference33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018
Country/TerritoryUnited States
CitySan Antonio


  • Common mode (CM) current
  • photovoltaic (PV) system
  • transformerless inverter
  • unipolar sinusoidal pulse width modulation (SPWM)
  • virtual DC bus


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