Orthogonal frequency division multiple access (OFDMA) systems in the uplink suffer from multiple access interference (MAI) due to their high sensitivity to frequency misalignments between different users. Moreover, carrier frequency offset (CFO) is a major factor that degrades performance of the OFDMA system. As the maximumlikelihood (ML) estimator is impractical in this context, we introduce a...

This paper presents an extensive study on the application of Artificial Bee Colony (ABC) algorithm for load frequency control (LFC) in multi-area power system with multiple interconnected generators. The LFC model incorporates various possible physical constraints and non-linearities such as generation rate constraint, time delay, dead zone and boiler. The ABC algorithm is used to find the opti...

This paper presents a novel composite heuristic algorithm for global optimization by organically integrating the merits of water cycle (WCA) and gravitational search (GSA). To effectively reinforce exploration exploitation algorithms reasonably achieve their balance, modified WCA is first put forward to strengthen its performance introducing concept basin, where position solution also considere...

A new modified severity function is proposed, based on which the N-2 line contingencies in the IEEE 30 bus system are analyzed and ranked. FACTS devices like Static VAR Compensator (SVC) and Thyristor Controlled Series Capacitor (TCSC) are used for achieving reduction in under voltage severity value and reduction in voltage deviation from the nominal value. A hybrid combination of two heuristic...

Topology control is a significant method to reduce energy consumption and prolong the network lifetime. Connected Dominated Sets (CDS) are emerging technologies construct energy- efficient optimal topology. Traditional topology construction algorithms not utilized suitable optimization techniques for finding optimum location of active nodes in networks. In this paper, Bacteria Foraging Algorith...

Frequency regulation of low inertia symmetric micro grids with the incorporation asymmetric renewable sources such as solar and wind is a challenging task. Virtual Inertia Control (VIC) idea increasing grids’ by energy storage systems. In current study, an adaptive fuzzy PID structure derivative filter (AFPIDF) controller suggested for VIC grid sources. To optimize proposed controllers, modifie...