1. School of Electrical Engineering, Weihai Innovation Research Institute, Qingdao University, Qingdao 266000, China
2. ABB (China) Limited Xiamen Branch, Xiamen 361000, China
3. School of Information Engineering, Zhejiang University of Technology, Hangzhou 310014, China
4. School of Control Science and Engineering, Shandong University, Jinan 250100, China