Optimization of PID controller for load-frequency control in power system with hydro-turbine and transient drop compensator using hybrid PSO-NM algorithm

Subject Areas : Electrical and Computer Engineering

Ahmad Baghban ¹ , Seyed Arman Shirmardi ² , Mahyar Abasi ³

1 - Department of Electrical Engineering, Karoon Institute of Higher Education, Ahvaz, Iran
2 - Department of Electrical Engineering, Karoon Institute of Higher Education, Ahvaz, Iran
3 -

Received: 2024-11-11 Accepted : 2025-03-28 Published : 2025-07-03

Keywords: load-frequency control, power system, PID controller, small signal stability, hydro-turbine.,

Abstract :

This paper presents a novel algorithm for load control of a hydraulic turbine connected to an infinite bus with transient droop compensator. The proposed method utilizes PID control and a hybrid particle swarm optimization algorithm. The considered PID controller can tolerate a wide range of variations in system parameters and stabilize the system without significant overshoots and oscillations. The optimized PID controller has lower overshoot and settling time compared to the non-optimized PID controller. The PID controller also reduces ripple and fluctuations in output power, making it a valuable tool for frequency and power control of hydraulic turbine systems. Overall, the results show that the optimized PID controller can effectively control the frequency and power of hydraulic turbine systems, but in some cases, more advanced control methods may be required. The network under study is modeled in the Simulink environment of MATLAB software. The results obtained from the implementation of various scenarios confirm the correct performance of the proposed algorithm. The optimized PID controller can tolerate a wider range of variations in system parameters. While the non-optimized PID controller may operate without overshoot at Tw=3 (hydraulic turbine time constant), the optimized controller stabilizes the system without overshoot up to Tw=5.

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