Sze Sing Lee, Yam P. Siwakoti, Chee Shen Lim, and Kyo-Beum Lee, "An Improved PWM Technique to Achieve Continuous Input Current in Common-Ground Transformerless Boost Inverter," IEEE Transactions on Circuits and Systems II, vol. 67, no. 12, pp. 3133-3136, > Paper

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 letter 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.