Design of Exponantial-2-DOF-PID Controller Using Stochastic Fractal Search Algorithm for Interconnected Electric Power Systems

Mehmet Karayel

Abstract


Abstract- To meet the increasing energy demand, it is an inevitable necessity to connect alternative energy sources and different energy sources to the interconnected power system. The most important factor determining the quality and reliability of energy in the interconnected power system is frequency. Load changes, external disturbances and parameter changes in the power system (PS) cause changes in frequency and power values in all areas connected to the power system. Fast and reliable control of power and frequency changes occurring in a power system is called load frequency control (LFC). For good quality and reliable energy production, the LFC must be resilient to unknown external disturbances and parameter changes in the power system. To this end, this research presents an exponential two degrees of freedom PID (EXP-2DOF-PID) controller to improve the LFC performance of PSs. The proposed controller consists of a tunable exponential function placed in front of a two degree of freedom PID controller. The exponential function produces a nonlinear output signal by acting on the error value at its input and the derivative of the error. To achieve the highest performance, the parameters of the proposed controller are determined by the stochastic fractal search (SFS) algorithm. The Integral of Time Absolute Error (ITAE) cost function was used during the optimization. The EXP-2DOF-PID controller has been tested on different PS models to verify its performance and versatility. Extensive comparison is made to highlight the performance of the proposed controller.


Keywords


Load Frequency Control; Exponantial; 2DOF-PID; Stocastic Fractal Search Algorithm; optimization.

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References


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DOI (PDF): https://doi.org/10.20508/ijsmartgrid.v9i2.459.g382

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