This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessArticle by Youping Fan 1,*, Peng Zhang 2, Ben Shang 1, Dianlang Wang 2, Wen’an Li 1, Dongjian Zhuang 1, Zihan Chen 1, Zhaoyi Zhang 1 and Wu Wen 1 1 School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China 2 China Southern Power Grid Co., Ltd., EHV Transmission Company, Guangzhou 510700, China * Author to whom correspondence should be addressed.