energies Article A Novel Protection Method for Single Line-to-Ground Faults in Ungrounded Low-Inertia Microgrids Liuming Jing, Dae-Hee Son, Sang-Hee Kang and Soon-Ryul Nam * Department of Electrical Engineering, Myongji University, Yongin 449-728, Korea; liuming_mark@126.com (L.J.); son...