The voltage violations can be mitigated by dispatching various var devices. The conventional tap adjustment of on-load tap changer (OLTC) and switching of capacitor banks (CBs) have been widely used in voltage regulation [6]. As conventional regulation devices are limited by the slow response and discrete voltage regulation [7], it is difficult to provide accurate real-time voltage control for DGs.However, the reactive power provided by DG interface inverters is a potential solution for fast voltage regulation [8]. As DG inverters generate nominal power during just a small fraction of the time, the remaining power capacity available in the inverters can be used for continuous voltage regulation. In general, the