A latest common-ground transformerless inverter for photovoltaic (PV) system has demonstrated its superiority over its existing counterpart due to its merits of single-stage structure and voltage boost capability. The exploited modulation scheme, however, led to discontinuous input current that draws high peak current from the source and causes high input power fluctuation in the converter. Such discontinuous and high peak current are detrimental to the PV source. Addressing this concern, this brief proposes a new modulation technique that achieves continuous input current with reduced peak magnitude while in the meantime ensures a good quality ac output voltage. Simulation and experimental results of a laboratory prototype are provided to verify the effectiveness of the proposed modulation technique.
Manuscript received November 4, 2019; revised December 29, 2019; accepted January 16, 2020. Date of publication January 20, 2020; date of current version November 24, 2020. This work was supported in part by the Malaysian Ministry of Higher Education under Fundamental Research Grant Scheme under Grant FRGS/1/2018/TK04/USMC/02/1. This brief was recommended by Associate Editor X. Ruan. (Corresponding author: Sze Sing Lee.) Sze Sing Lee is with Newcastle Research and Innovation Institute, Newcastle University, Singapore (e-mail: szesinglee@gmail.com).
