Optimal gravitational search algorithm for automatic generation control of interconnected power systems

• Main Authors: Rabindra Kumar Sahu, Sidhartha Panda, Saroj Padhan
• Format: Article
• Language: English
• Published: Elsevier 2014-09-01
• Series: Ain Shams Engineering Journal
• Subjects: Automatic Generation Control (AGC); Proportional Integral Derivative Controller; Gravitational Search Algorithm (GSA); Governor dead-band nonlinearity; Generation Rate Constraint (GRC); Sensitivity
• Online Access: http://www.sciencedirect.com/science/article/pii/S2090447914000276

An attempt is made for the effective application of Gravitational Search Algorithm (GSA) to optimize PI/PIDF controller parameters in Automatic Generation Control (AGC) of interconnected power systems. Initially, comparison of several conventional objective functions reveals that ITAE yields better system performance. Then, the parameters of GSA technique are properly tuned and the GSA control parameters are proposed. The superiority of the proposed approach is demonstrated by comparing the results of some recently published techniques such as Differential Evolution (DE), Bacteria Foraging Optimization Algorithm (BFOA) and Genetic Algorithm (GA). Additionally, sensitivity analysis is carried out that demonstrates the robustness of the optimized controller parameters to wide variations in operating loading condition and time constants of speed governor, turbine, tie-line power. Finally, the proposed approach is extended to a more realistic power system model by considering the physical constraints such as reheat turbine, Generation Rate Constraint (GRC) and Governor Dead Band nonlinearity.