This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessArticle by Fayun Zhou 1,2, Xinxing Xiang 1,2,*, Fujun Ma 1, Yichao Wang 1, Fangyuan Zhou 3 and Peng Peng 2 1 College of Electrical and Information Engineering, Hunan University, Changsha 410082, China 2 Hunan Zhongke Electric Co., Ltd., Yueyang 414000, China 3 School of Automation, Central South University, Changsha 410083, China * Author to whom correspondence should be addressed.
