A New Method of the Load Compensation Use During Creation of Post Blackout Start-up Path in Power System

Process of power system restoration, especially after blackout, is very complicated logistically and technically. In order to restore thermal power plant in power system, as a source of power hydro power plant is commonly used. The distance between these power plants may be relatively high - even over 500 km. High voltage overhead transmission lines to connect the power plants during the creation of post blackout start-up path are switched on under no load condition. Relatively high value of natural reactive power of these lines makes that value of voltage at the end of the switched line may reach an unacceptable high level, in spite of application of typical algorithm of automatic voltage regulator of synchronous generator. In the paper a new method of effective use of load compensation during creation of post blackout start-up path is proposed. Theoretical assumptions and simulation results of an investigation are presented. An experiment performed in the Polish Power System is also described. This experiment proved that the method proposed by the authors is advisable. The method may be utilized by power system operators for power system restoration process in emergency conditions.