Automatic Generation Control using Fuzzy Logic

G. Mallesham and A. Rajani (India)


Automatic Generation Control (AGC), Fuzzy Logic Control (FLC), Generation Rate Control (GRC)


The reliable operation of a large interconnected power system necessarily requires an Automatic Generation Control (AGC). The objective of AGC is to regulate the power output of Generators within a specified area in response to change in the system frequency, tie line power or relation of the two to each other, so as to maintain the scheduled system frequency and power interchange in the other are within the prescribed limits. In this paper, the AGC system investigated consists of two equal area reheat thermal systems. A model of the same with conventional integrator controller is developed and responses of area control error, tie line power and change in frequency are observed. The later part of the study involves replacing the integral controller with Fuzzy Logic Controller (FLC). The design of FLC involves the allocation of areas inputs and outputs, mapping of rules between inputs and outputs and defuzzification of outputs into a real value. After comparing the dynamic responses with the one obtained from the conventional controller, Fuzzy logic controller is found to be a best controller than the conventional Integral controller.

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