증기터빈용 디지털 조속기의 설계에 관한 연구

Abstract

In our modern societies, electric power is the driving force of the industry. As many parts rely on electric power,demand for electricity usually rises. In case of most Korean power plants, a mechanical or electronic governor is used for an actuator control of a turbine generator.

For the stable power distribution service, it is desirable to change the old ones with improved governor of the steam turbine in speed control of the steam turbine at power plant for a long time.

In this paper, hardware and software system of a digital governor are designed to develop a controller of the digital type governor for the steam turbine.

Hardware in this digital governor consists of duplex I/O module and triplex CPU module and can drive a servo valve using 2 out of 3 voting algorithm with self-diagnostic ability.

Software in this digital governor consists of program of the operating system and applied programs.

The algorithm of speed control of the steam turbine is analyzed for the digital governor of Woodword Governor Company and made up for the weak points.

Transfer function is gained from model of a target plant and then combined into the overall transfer function. Then parameters are estimated, through an optimum object function.

The availability of a designed controller is confirmed through numerical simulation and desired results are attained.