Frequency regulation is in a first line of preference for an interconnected power
system. Presence of nonlinearities in the generation systems further raises the complexity
level of the problem. In this scenario, this article presents a robust Automatic Generation Control (AGC) mechanism to maintain the frequency and tie-line power of the power
system to their nominal values. A Coefficient Diagram Method (CDM) based AGC mechanism including an AC/DC tie-line and Unified Power Flow Controller (UPFC) has been
developed and the performance in handling the frequency regulation has been analyzed.
The nonlinearities such as Governor Dead-Band (GDB) and Generation Rate Constraint
(GRC) are included in the system to analyze the proposed AGC scheme in a more realistic
approach. The AC/DC tie-line and UPFC which are included in the proposed AGC scheme
provides an immense strength to handle the active power variation as-well-as frequency
regulation. To develop a more effective AGC scheme, the parameters of an AC/DC tie-line
and UPFC are optimized by successful implementation of the Fruit Fly Optimization Algorithm (FOA). The justification of the proposed AGC scheme has been carried out through
a step by step verification such as justifying the CDM based controller, effectiveness of
the proposed scheme and robustness of the system against parameters variation. The CDM
based controller has been compared with the conventional controllers to elevate the effectiveness and the supremacy of the proposed AGC scheme has been examined by comparing
with previously published work. The design and simulation of the work has been carried
out by the MATLAB/Simulink® tool box.
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