Grey Wolf Optimization to Solve Load Frequency Control of an Interconnected Power System: GWO Used to Solve LFC Problem

Grey Wolf Optimization to Solve Load Frequency Control of an Interconnected Power System: GWO Used to Solve LFC Problem

Dipayan Guha (Electrical Engineering Department, Dr. B. C. Roy Engineering College Durgapur, Durgapur, India), Provas Kumar Roy (Electrical Engineering Department, Jalpaiguri Government Engineering College, Jalpaiguri, India) and Subrata Banerjee (National Institute of Technology Durgapur, Durgapur, India)
Copyright: © 2016 |Pages: 22
DOI: 10.4018/IJEOE.2016100104
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Abstract

In this article, a novel optimization algorithm called grey wolf optimization (GWO) with the theory of quasi-oppositional based learning (Q-OBL) is proposed for the first time to solve load frequency control (LFC) problem. An equal two-area thermal power system equipped with classical PID-controller is considered for this study. The power system network is modeled with governor dead band and time delay nonlinearities to get better insight of LFC system. 1% load perturbation in area-1 is considered to appraise the dynamic behavior of concerned power system. Integral time absolute error and least average error based fitness functions are defined for fine tuning of PID-controller gains employing the proposed method. An extensive comparative analysis is performed to establish the superiority of proposed algorithm over other recently published algorithms. Finally, sensitivity analysis is performed to show the robustness of the designed controller with system uncertainties.
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1. Introduction

The main idea behind the power system operation and control is to maintained balance between the total powers generation and total load demand plus losses accompanying to the system under normal and disturbed conditions. Load frequency control (LFC) of an interconnected power system network places an attention’s towards balancing between generations and demands such that system frequency and tie-line exchange power can be upheld to their predefined levels. Literature review reveals that the work on load frequency control (LFC) was proposed by Chon, 1957. However, the concept of optimal control theory in LFC area is established by Elgerd and Fosha (1970). Thereafter, many types of research have been performed in LFC area to improve the existing results. An extensive literature survey on LFC problem for conventional and distributed generation is available in Ibraheem, Kumar, and Kothari (2005). Saikia, Nanda, and Mishra (2011) presented a comparative analysis between several classical controllers in the area of LFC and established the superiority of designed controller. The effectiveness of double-stage reheat turbine and electrical governor in an interconnected hydro-thermal system over single stage turbine and the mechanical governor is elaborated in Nanda, Mangla, Suri (2006). Authors also gave a clear idea for the selection of speed regulation parameter and sampling time period for the said system. Gozde and Taplamacioglu (2011) proposed proportional- integral (PI) controller for two-area automatic generation control (AGC) system with governor dead-band (GDB) nonlinearity. Recently, a number of researchers like Roy, Bhatt, and Ghoshal (2010), Guha, Roy, and Banerjee (2015), Mohanty, Panda, and Hota (2014) proposed proportional-integral-derivative (PID) controller in lieu of PI-controller for further expansion of existing results.

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