Boiler Turbine Coordination Control System for Turbine Speed Regulation Rate in the Thermal Power Plant

摘要

The present invention is an automatic control system from the power plant to control the generator output as compared detecting the turbine speed with respect to the frequency change in the power grid in order to maintain the frequency is always 60 Hz, usually governor valve (Governor Valve for turbine inlet ) the installation, but the system that controls the alternator output by closing open, depending on the turbine speed, turbine governor because it affects the boiler closes, open the valve the boiler and the turbine should not be not controlled by cooperation (boiler turbine coordination) .; To Boiler Turbine Coordinated Control in Power Plants need several signal controllers, manipulators and complex, there is a need for these units to be integrated master control logic (Unit Master Control Logic).; When classifying unit master control system automatically feed control system (ADS or AGC) (of the representative Fig. ①), frequency change control system for the (turbine speed change) (of a representative ②), the signal input system (the representative Fig ③, boiler master controller (④ of the representative Fig.), and the like turbine master controller (⑤ in Fig represented).; How well designed unit is the master control system for the head of the plant and how precisely adjust the controls, therefore the entire plant operation is stable, the entire plant in an emergency situation (Run Back, Load Rejection) can be operated without trouble stopping.; In particular, and power plants is a very important factor in when in an isolated situation in KEPCO maintaining the rated frequency (60Hz) to the appropriate controller designed for a frequency shift profits of the company with five subsidiaries, nationally as the national competitiveness of the electricity quality the can be improved. Therefore, we created a design master control logic unit for improving the power plant speed update ratio.; * For reference speed update ratio (Speed ​​Regulation Rate) is the frequency variation that is a frequency since if written illustrates the output variation of the generator as a percentage, is set at a power plant at a speed update ratio of 10%, the country of the grid frequency 60Hz for the turbine speed change amount this variation 6Hz (+ - 3Hz) with respect to the generator output is a means that we have to change from 0% to 100%. *