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Load frequency control (LFC) for multi-area restructured power system using discrete control scheme has been suggested in this paper. The proposed LFC scheme utilizes synchronously measured data of frequency and tie-line power to calculate area control error (ACE). A discrete non-integer proportional integral derivative controller (D-FOPID) has been used to derive frequency error to zero. Two-area thermal and four-area hydro thermal deregulated power system has been used to investigate various LFC issues. The optimal factors of D-FOPID have been obtained using big bang big crunch (BBBC) algorithm. The system results under MATLAB/Simulink validate that D-FOPID effectively work under different types of contract scenarios. D-FOPID performance has also been compared to discrete proportional integral derivative controller (D-PID). Further the compliance with control standards of North American electric reliability council (NERC) has also been ensured for both the controller.

Load Frequency Control in a Multi-Area Deregulated Power System with BBBC-based Discrete Fractional Order Control Scheme