Use of Synchronous Generators for Gas Turbine Power Plants

Abstract

The combination of gas turbine engines and low-speed generators that are part of power plants is a large-mass unit with low specific indicators of the mass-to-unit power ratio. (Research purpose) The research purpose is developing a new kinematic scheme of a gas turbine engine with a high-speed synchronous electric generator, higher reliability and long service life, reduced weight and size characteristics of the power plant. (Materials and methods) Established that small gas turbine power and general-purpose power plants are not produced in Russia, research work was not systematic. It was determined that synchronous generators and gas turbine engines are used on two-shaft kinematic systems that reduce the rotation frequency of the generator rotor, where a large diameter of the free turbine entails a higher level of vibration, and due to the high level of sliding leads to a lower torque of the power plant at low rpm. (Results and discussion) It has been shown that the use of single-channel kinematic schemes contributes to simpler control, this opens up a wide prospect for their use in power plants for the purpose of supplying electricity to consumers and mobile agricultural vehicles. A new kinematic scheme of a high-speed generator has been developed, in which the rotor and stator interact with each other according to the type of sliding bearing. (Conclusions) The advantages of using a single-shaft kinematic scheme for the joint operation of a gas turbine engine with a high-speed synchronous generator have been revealed, which are expressed in a smaller moment of straining of the rotor and the absence of a sliding coefficient between the shafts. It was stated that as a result of using the proposed design of the power module, the reliability of the generator increases, the operating speed increases due to the use in the design of the polished outer surface of the rotor and the polished inner surface of the stator, working according to the type of sliding bearing, with forced oil supply at a pressure of 2-5 kilograms per square centimeter, at the same time, heat removal from the stator winding improves.