Advanced grid connected PV system with functions to suppress disturbance by PV output variation and customer load change

The PV array has unstable output patterns dependent on weather conditions. Therefore, assuming high-density grid connection in the future, these unstable output patterns can be one of the main reasons to cause power disturbances such as the voltage variation, the frequency variation and the harmonic voltage generation into utility. And also it should be considered that a sudden customer load change is one of those reasons. Therefore, this study suggested a PV system with suppression functions against such disturbances in the side of amicable relationship with utility and verified the validity of the proposed system by EMTP and ACSL-based analysis.