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This book proposes innovative and practicable solutions in power system voltage control and implementation based on the author s twenty years of experience. The monograph falls into two parts. Part I introduces the link between voltage and reactive power in AC systems and provides a complete overview of the power system resources that can contribute to the absorbtion/delivery of the reactive power. Local controls for voltage and reactive power are also described in detail. Part II presents the main body of the text composed of materials detailing: hierarchical control of transmission voltages; wide-area protection schemes; voltage instability of real-time indicators; economic recognition of the voltage ancillary service; and voltage control in smart grids. The text will help to show engineers working in electrical power companies and system operators the significant advantages of new control solutions and will also interest academic control researchers studying ways of increasing power system stability and efficiency.