Modeling and Simulation Study of Hydraulic Turbine Governor Based on SIMULINK

The turbine governor is one of the most important devices for the automatic and intelligent control of hydropower stations. As a key part of the hydraulic turbine governor, the structure and control mode of the electro-hydraulic servo system is crucial, which has a direct impact on the quality of the AC power output and is also related to the operational safety of the power station equipment. In this paper, a hydraulic turbine electro-hydraulic governor based on PLC using PID control algorithm is developed. A hydraulic servo system is established with a high-speed switching valve as the core. The system consists of two small diameter high-speed ball valves and a large diameter electromagnetic reversing valve as the control circuit, and the two high-speed switching valves are controlled by PLC outputting two PWM pulse signals respectively. A mathematical model of the hydraulic turbine speed control system is established and simulated in the Matlab SIMULINK environment. The static characteristics test under no-load condition and the follow-on system disturbance test are carried out in the laboratory to verify the control performance of the system under this operating condition.