1. School of Electrical and Power EngineeringChina University of Mining and TechnologyXuzhouJiangsu221116People's Republic of China
2. Jiangsu Province Laboratory of Electrical and Automation Engineering for Coal MiningXuzhouJangsu221116People's Republic of China
3. Key Laboratory of Measurement and Control of Complex Systems of Engineering, Ministry of Education, School of AutomationSoutheast UniversityNanjing210096People's Republic of China
4. Department of Electrical EngineeringThe University of Texas Rio Grande ValleyEdinburgTX78539USA