1. State Grid Smart Grid Research Institute Co., Ltd.,State Key Laboratory of Advanced Power Transmission Technology,Beijing,China
2. Beijing Key Laboratory of DC Grid Technology and Simulation State Grid Smart Grid Research Institute Co., Ltd.,Beijing,China
3. North China Electric Power University,School of Electrical and Electronics Engineering,Baoding,China
4. State Grid Liaoning Electric Power Co., Ltd.,Electric Power Research Institute of State Grid Liaoning Electric Power Co, Ltd.,Shenyang,China