1. Graduate Department, Shenyang Institute of Engineering, Shenyang 110136, Liaoning Province, China
2. School of Electrical Engineering, Shenyang Institute of Engineering, Shenyang 110136, Liaoning Province, 436100, Liaoning Province, China
3. Power Company Control Center, Hubei Provence School of Electrical Engineering, Shenyang Institute of Engineering, Shenyang 110136, Liaoning Province, China