This book addresses the field of modern power systems with a focus on voltage security and coordinated control in power-electronics-dominated grids. It systematically investigates the full-chain characteristics of voltage dynamics, covering emerging power electronic devices, renewable plant clusters, system-level interactions, novel load behaviors, and energy storage integration. By introducing advanced methods such as heterogeneous device modeling, plant-level equivalent modeling, and system-wide coordinated control strategies, the book reveals the underlying mechanisms of voltage stability under high renewable penetration and weak grid conditions. Particular emphasis is placed on the transition from physics-driven to control-driven voltage support, as well as on multi-timescale stability analysis and “autonomous–coordinated” control frameworks. It offers both methodological innovations and practical insights for enhancing voltage stability in next-generation power systems. The book is intended for graduate students, researchers, and engineers in power engineering, power electronics, and energy systems, as well as professionals involved in renewable integration and grid operation.

Asst. Prof. Lin Xue received his B.Eng. degree from Qinghai University in 2020, and his Ph.D. degree (master-doctor combined program) from Chongqing University in 2025. His doctoral dissertation was nominated for the Outstanding Doctoral Dissertation of Chongqing University. During 2023-2024, he was a joint PhD candidate at the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore. Since 2025, he has been an Assistant Professor at the School of Electrical and Information Engineering, Zhengzhou University. His research interests focus on new-type power systems and renewable energy technologies. He has published more than 20 peer-reviewed journal papers in relevant fields.

Prof. Zhongwen Li received his M.Eng. degree from the School of Electrical Engineering, Zhengzhou University, in 2010, and his Ph.D. degree from the University of Chinese Academy of Sciences (Shenyang Institute of Automation), in 2017. From 2019 to 2020, he was a visiting scholar at the University of Alabama, USA, supported by the China Scholarship Council. He is currently a Professor and Ph.D. Supervisor with the School of Electrical and Information Engineering, Zhengzhou University. His research interests mainly include new power systems, microgrids, power electronics, grid-connected renewable energy generation, and distributed control. He has presided over multiple projects funded by the National Natural Science Foundation of China and published numerous SCI/EI-indexed journal papers in related fields.

Assoc. Prof. Tao Niu received the B.S. and Ph.D. degrees from the Department of Electrical Engineering, Tsinghua University, Beijing, China, in 2014 and 2019. He is currently an Associate Professor with Chongqing University, Chongqing, China. His research interests include voltage security region, automatic reactive power voltage control, renewable generation integration and reactive power analysis of hybrid AC/DC system. He has presided over two National Natural Science Foundation of China projects and more than 10 industry-university collaboration projects, and published 25 SCI journal papers.

Prof. Zhiping Cheng received the B.S. degree from the School of Physics Electronic Engineering, Xinyang Normal University, Xinyang, China, in 1998, the M.S. degree in electrical engineering from Henan Polytechnic University, Jiaozuo, China, in 2003, and the Ph.D. degree in control theory and control engineering from Zhengzhou University, Zhengzhou, China, in 2020. He is currently a Professor with Zhengzhou University. His research interests include theory, application, and control of renewable energy systems and microgrids. He has presided over more than 50 research projects, published over 40 journal papers as the first or corresponding author, authored one academic monograph, and holds 15 granted invention patents.