Haoming Liu received the B.S., M.S. and Ph.D. degrees all from Nanjing University of Science and Technology, China, in 1998, 2001, and 2003, respectively. He is currently a full professor at the School of Electrical and Power Engineering, Hohai University, China. He has published more than 200 journal papers, 30 patents, and 2 books. His research interests include new energy generation, distribution system analysis and control, and electricity market.Muhammad Yasir Ali Khan received his Ph.D. degree from the College of Energy and Electrical Engineering, Hohai University in 2023. He is now a post-doctoral researcher at Hohai University, China. His research interests include power electronic converters, renewable integration, microgrid, and power system.Jingjing Zhai received her Ph.D. in Control Engineering from Nanjing University of Science and Technology, Nanjing, China, in 2022. She is currently an associate professor at Nanjing Institute of Technology. Her research interests include the optimal operation of integrated power systems and intelligent power utilization.

• 1 An Overview of Microgrid Concept, Classifications, and Components 2 Benefits, Challenges, and Technical Aspects of Microgrid 3 Hierarchical Control of Microgrid 4 Adaptive Distributed Secondary Control Schemes for Microgrid 5 Distributed Secondary Controller for Microgrid to Achieve Synchronization 6 Secondary Control Strategy for Microgrid Considering Communication Delays

Haoming Liu received the B.S., M.S. and Ph.D. degrees all from Nanjing University of Science and Technology, China, in 1998, 2001, and 2003, respectively. He is currently a full professor at the School of Electrical and Power Engineering, Hohai University, China. He has published more than 200 journal papers, 30 patents, and 2 books. His research interests include new energy generation, distribution system analysis and control, and electricity market.Muhammad Yasir Ali Khan received his Ph.D. degree from the College of Energy and Electrical Engineering, Hohai University in 2023. He is now a post-doctoral researcher at Hohai University, China. His research interests include power electronic converters, renewable integration, microgrid, and power system.Jingjing Zhai received her Ph.D. in Control Engineering from Nanjing University of Science and Technology, Nanjing, China, in 2022. She is currently an associate professor at Nanjing Institute of Technology. Her research interests include the optimal operation of integrated power systems and intelligent power utilization.

• 1 An Overview of Microgrid Concept, Classifications, and Components 2 Benefits, Challenges, and Technical Aspects of Microgrid 3 Hierarchical Control of Microgrid 4 Adaptive Distributed Secondary Control Schemes for Microgrid 5 Distributed Secondary Controller for Microgrid to Achieve Synchronization 6 Secondary Control Strategy for Microgrid Considering Communication Delays

Haoming Liu received the B.S., M.S. and Ph.D. degrees all from Nanjing University of Science and Technology, China, in 1998, 2001, and 2003, respectively. He is currently a full professor at the School of Electrical and Power Engineering, Hohai University, China. He has published more than 200 journal papers, 30 patents, and 2 books. His research interests include new energy generation, distribution system analysis and control, and electricity market.Muhammad Yasir Ali Khan received his Ph.D. degree from the College of Energy and Electrical Engineering, Hohai University in 2023. He is now a post-doctoral researcher at Hohai University, China. His research interests include power electronic converters, renewable integration, microgrid, and power system.Jingjing Zhai received her Ph.D. in Control Engineering from Nanjing University of Science and Technology, Nanjing, China, in 2022. She is currently an associate professor at Nanjing Institute of Technology. Her research interests include the optimal operation of integrated power systems and intelligent power utilization.

• 1 An Overview of Microgrid Concept, Classifications, and Components 2 Benefits, Challenges, and Technical Aspects of Microgrid 3 Hierarchical Control of Microgrid 4 Adaptive Distributed Secondary Control Schemes for Microgrid 5 Distributed Secondary Controller for Microgrid to Achieve Synchronization 6 Secondary Control Strategy for Microgrid Considering Communication Delays