This book focuses on fully distributed approaches for control, operation management and optimization of electrical power systems with high distributed renewable generation penetration level. The authors follow an evolutionary course in presenting topics. Particularly, the foundational technologies and background knowledge are introduced first for each topic, and then the technical advances and the specific and emerging technologies are elaborated. In the control aspects, system-level coordinated control and optimization of active and reactive power in power grids are presented. In the energy management aspect, the coordinated control of distributed generation, elastic load and energy storage systems are introduced with the consideration of maximizing overall social welfare.