Analysis of Speed Droop Governor Control System for Maintaining Frequency Stability in the Nagan Raya Steam Power Plant
Abstract
Frequency stability is a primary aspect in maintaining the reliability of Steam Power Plant (PLTU) operations, where the governor plays a crucial role through the speed droop control mechanism in adjusting turbine mechanical power in response to changes in generator rotational speed. This study analyzes the performance of the speed droop governor control system at the Nagan Raya PLTU using a quantitative approach through modeling and simulation with MATLAB/Simulink representing the steam turbine, governor, and synchronous generator. Simulation results show that the governor is able to respond to load changes stably and proportionally, with a simulated droop value of 4.56%, close to the field value of 5%, and a maximum frequency deviation of ±0.14 Hz. The pu_velocity graph indicates an initial overshoot of 1.023 pu and an undershoot of 1.013 pu, which are subsequently damped and reach a stable condition at 1.015 pu within approximately 10 seconds, reflecting a system with good damping characteristics and no hunting symptoms. Droop curve analysis shows a linear relationship between power changes and frequency, consistent with the load-sharing principle among generating units. Overall, this study concludes that the speed droop governor control system at the Nagan Raya PLTU functions effectively in maintaining frequency stability during load variations, making it suitable as a reference for governor optimization and future power plant control system development.
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