1. Korea Electrotechnology Research Institute, Uiwang, South Korea
2. Korea Grid Forming Company Ltd., Naju, South Korea
3. Department of Electrical Engineering, Sangmyung University, Seoul, South Korea
4. Research Center, Pion Electric, Seoul, South Korea
5. Korea Electric Power Research Institute, Daejeon, South Korea
6. School of Electrical and Electronic Engineering, Yonsei University, Seoul, South Korea