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Modern PID/FOPID controllers for frequency regulation of interconnected power system by considering different cost
Mohamed Ahmed Ebrahim Mohamed1, K Jagatheesan2, B Anand3
1Electrical Engineering Department, Faculty of Engineering at Shoubra, Benha University, Cairo, Egypt. mohamed.mohamed@feng.bu.edu.eg.
Scientific Reports
|August 28, 2023
Summary
This study optimizes frequency regulation in interconnected power systems using advanced controllers like Fractional Order PID (FOPID) and PID. Optimization algorithms, including Grey Wolf Optimizer (GWO) and Atom Search Inspired Algorithm (ASIA), enhance system stability during load variations.
Area of Science:
- Electrical Engineering
- Control Systems
- Renewable Energy Integration
Background:
- Interconnected power systems require robust frequency regulation to maintain stability during load fluctuations.
- Integrating diverse energy sources like thermal, wind, and hydro presents unique control challenges.
- Traditional Proportional-Integral-Derivative (PID) controllers may require enhancement for optimal performance in complex grids.
Purpose of the Study:
- To investigate and enhance the frequency regulation capabilities of a three-area interconnected power system.
- To compare the effectiveness of Fractional Order PID (FOPID) and PID controllers for subsidiary regulation.
- To optimize controller gains using metaheuristic algorithms for improved transient response.
Main Methods:
- Implementation of FOPID and PID controllers for frequency regulation.
- Optimization of controller parameters using Genetic Algorithm (GA), Grey Wolf Optimizer (GWO), Sine Cosine Inspired Algorithm (SCIA), and Atom Search Inspired Algorithm (ASIA).
- Evaluation using cost functions: Integral Absolute Error (IAE), Integral Time Absolute Error (ITAE), Integral Square Error (ISE), and Integral Time Square Error (ITSE).
Main Results:
- ASIA-FOPID achieved a settling time of 25.12 seconds, outperforming other methods.
- Controllers optimized with Integral Time Square Error (ITSE) and Integral Square Error (ISE) demonstrated superior performance.
- Robustness tests confirmed the effectiveness of the proposed optimization techniques under parameter variations and load changes.
Conclusions:
- FOPID controllers, optimized with metaheuristic algorithms like ASIA, offer significant improvements in frequency regulation for interconnected power systems.
- The choice of cost function (ITSE and ISE) critically impacts controller performance.
- The proposed optimization methods provide a robust solution for enhancing power system stability.
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