1. School of Energy Engineering, Yulin University, Yulin, China
2. School of Electrical Engineering, Xi'an University of Technology, Xi'an, China
3. Analog Devices, Inc., Norwood, MA, USA
4. School of Aeronautics and Astronautics, Xiamen University, Xiamen, China
5. School of Automation Science and Engineering, Xi'an Jiao Tong University, Xi'an, China