Optimized Coordinated Control to Enhance Frequency Stability in Power System Considering Renewable Energy Penetration

Kwan, Zhi Hong (2023) Optimized Coordinated Control to Enhance Frequency Stability in Power System Considering Renewable Energy Penetration. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

Load frequency control plays a vital role in modern power systems in regulating the system frequency and power flow in tie line. Sudden load change such as mismatch in demand and supply causes frequency to fluctuate and the integration of irregular renewable energy into power system has further caused frequency control to difficult. The current problem is that conventional control is ineffective and slow in restoring the nominal frequency in face with sudden load change and irregular renewable energy. In future, conventional generators are gradually replaced by renewable energy and hence reduces the system inertia. As a result, the power system is more prone to frequency deviation. This has further magnified the ineffectiveness of conventional control. Previous research has primarily focused on studying the effect of SMES in load frequency control, applying different computing algorithm in optimizing the controller in the secondary control loop, controlling the input to the SMES unit and applying different control scheme in the secondary control loop. In this research, the application of SMES, controlling the input of SMES with PI controller and PID controller as the secondary loop controller form the Coordinated Control Scheme. This control scheme is optimized with PSO and investigated in a two-area interconnected power system. The robustness and effectiveness of this proposed method was tested with MATLAB/SIMULINK software and evaluated with different loading profile in two areas, the integration of renewable energy and reduced system inertia. Several performance indices are considered such as overshoot, undershoot and settling time. The Optimized Coordinated Control shows outstanding performance in suppressing the frequency deviation within the range of 0.5 Hz in all extreme condition as compared to conventional control and PSO optimized PI secondary loop controller