1. Faculty of Electric Power EngineeringKunming University of Science and TechnologyKunming650500People's Republic of China
2. College of Engineering, Shantou UniversityShantou515063People's Republic of China
3. Electric Power Research Institute of Yunnan Power Grid Co., LtdKunming650217People's Republic of China
4. College of Electric Power, South China University of TechnologyGuangzhou510640People's Republic of China