Mathematical model of an electromechanical executive device for steam turbine generator based on a linear actuator

The electricity supply quality largely depends on the synchronized operation of generators. To increase the reliability of synchronization of generators, it is necessary to adjust a turbine rotation frequency in a coordinated method. In this case, it is advisable to use an electromechanical control system for changes in permissible generator turbine speed range. This article considers the issue of mathematical description of electromechanical speed control system of a steam turbine generator made on basis of a linear actuator. A block diagram of a turbine unit with electromechanical speed control is given. In this scheme takes into account the effect of steam pressure on the turbine valve. The mathematical description is presented in a transfer functions form obtained on the basis of linearization of turbine motion equation in relative deviations of a turbine generator and electric drive parameters. The linearized description will allow to apply classical methods of automatic speed control system synthesis.