Significant growth of power plants unit capacity, large extent of power grids, presence of weak interconnections and uneven load schedule increase are the development features of power industry, that necessitate an improvement of energy facilities automatic control systems (ACS). Operating experience of electric power facilities microprocessor automatic control systems showed their advantages in comparison with the devices made from discrete components, for both service functions and reliability. A microprocessor control system in a combination with a static VAR compensator has been designed to regulate and stabilize voltage in an electric power system at a predetermined level. The ACS usage also leads to a reduce of power losses in the stabilized electric power system and an improvement in electrical load operations. © 2017 The Authors.