Abstract
The present work studies the performance of the less explored fractional order (FO) based cascade tilt-integral-tilt-integral-derivative (CTI-TID) controller for load frequency control (LFC) of interconnected restructured power systems having nonlinearity through time-domain simulation. The efficacy of the proposed controller is tested by comparing its results with that of other studied controllers such as cascade proportional-integral-tilt-derivative (CPI-TD) and proportional-integral-derivative (PID) controllers. However, a heuristic water cycle algorithm (WCA) is used for realistic comparison to find their optimized gain values. In this work, firstly, the efficacy of WCA over other powerful algorithms like genetic algorithm, teaching learning-based and differential evolution algorithm is established in tuning designed CTI-TID controllers. Secondly, to analyze the supremacy of the proposed WCA tuned CTI-TID controllers, frequency responses obtained under it are compared with that of WCA tuned CPI-TD and PID controllers. Lastly, the impact of the capacitive energy storage system on LFC's performance under the proposed WCA tuned CTI-TID controller is analyzed.
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