Abstract
Automatic voltage regulator (AVR) system is an important device to regulate synchronous generator output voltage. Controllers are used to provide better stability and faster response for AVR system and this article shows two types of controllers: proportional-integral-derivative (PID) and proportional-integral-derivative-acceleration (PIDA) controllers. Harmony search algorithm (HSA), local unimodal sampling (LUS), and teaching learned based optimization (TLBO) are the optimization techniques used to tune each controller parameters. Integrated square error (ISE) is used as an objective function to minimize error in voltage for better stability and response. Transient response, root locus, and bode diagram are calculated for each controller using the three optimization techniques. The results are compared with other optimization techniques to find out the best performance and stability for an AVR system. The results show also which controller is better. Robustness analysis is made on the best system to check terminal voltage response with respect to load variation to ensure that this system can be applied for the AVR of synchronous generator in power system.
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