MARKET BASED LFC DESIGN USING ARTIFICIAL BEE COLONY

Proportional Integral Derivative (PID) type controller is still widely used for the solution of the Load Frequency Control (LFC) problem. On the other hand, the optimal tuning of PID gains is required to get the desired level of robust performance under different operation conditions. In this paper, optimal gains tuning of a PID controller for solution of the LFC problem in the restructured power system is proposed using Artificial Bee Colony (ABC) algorithm. The problem of robustly tuning of PID based LFC design is formulated as an optimization problem according to the time domain-based objective function which is solved by the ABC technique that has a strong ability to find the most optimistic results. To ensure performance and robustness of the proposed control strategy to stabilize frequency oscillations, the design process takes a wide range of operating conditions and system nonlinearities into account. To demonstrate the effectiveness of the proposed method a two-area restructured power system is considered as a test system under different operating conditions. The simulation results are shown to maintain robust performance in comparison with the particle swarm optimization and genetic algorithm based tuned PID controllers through FD and ITAE performance indices. Results evaluation show that the proposed control strategy achieves good robust performance for wide range of system parameters and load changes in the presence of system nonlinearities and is superior to the other controllers. Moreover, the proposed control strategy has simple structure, easy to implement and tune which can be useful for the real world restructured power system.