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Top1. Introduction
The LFC of multi-area power system mechanism, balance the total power generation with fluctuated load to maintain the frequency deviation within the specified/scheduled value. This power balance is achieved by means of controlling prime mover, to match load variations through the control of load reference in selected generating unit. Different types of LFC schemes have been developed from the past few decades and recent years (Jagatheesan and Anand, 2014a; Jagatheesan and Anand, 2014b; Jagatheesan, et al. 2014; Hassan, et al. 2014; Padhan, et al. 2014; Roy, et al. 2014; Francis and Chidambaram, 2015; Zare, et al. 2015; Chidambaram and Paramasivem, 2012; Dash, et al. 2015; Sahu et al. 2015: Dey, et al. 2013; Samanta, et al. 2013; Chakraborty, et al. 2013; Dey, et al. 2014; Azar and Serrano, 2014; Azar and Vaidyanathan, 2015; Zhu and Azar, 2015; Hassanien, et al. 2014). Conventional and classical controller based power systems are getting trouble while achieving power balance during the sudden load disturbance.
The main of the Load Frequency Contro(LFC) or Automatic Generation Control (AGC) is to maintain power balance between load with generation and keep the system parameters with in the specified limit during sudden/ continuous load varations. From the literature, it is clearly shows that many control, optimization techniques and controllers are developed and implementd in multi-area interconnected power systems(Hassan, et al. 2014; Padhan, et al. 2014; Roy, et al. 2014; Francis and Chidambaram, 2015; Zare, et al. 2015; Chidambaram and Paramasivem, 2012; Dash, et al. 2015; Azar and Serrano, 2014; Azar and Vaidyanathan, 2015; Azar and Zhu, 2015; Zhu and Azar, 2015; Azar and Serrano, 2015; Hassanien, et al. 2015; Jagatheesan and Anand, 2012; Jagatheesan, et al. 2014; Ying-Tung Hsiao, et al. 2004).