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Abstract
Nowadays distributed generation via residential branches connected to DC buses are going to spread. Therefore, the term nanogrid is used to describe a distributed generation in residential networks. This thesis presents the nanogrids using two types of renewable energy; as photovoltaic and wind power systems. The presented nanogrids are deeply investigated and modeled to enhance system performance. PV module types are presented by enhanced PV diode model through an adjusted model equation and mathematical algorithm. Wind nanogrid is presented by small VSWT directly coupled with a PMSG. Each nanogrid is augmented by third order battery dynamic model to extract surplus maximum power during continuous maximum power operation. Novel controllers for optimum power operation and power sharing between the nanogrids are derived. The MPPT for PV is demonstrated by a novel PCM which has been proposed by new generic polynomial equations using hybrid look up-curve fitting technique. A simple and fast control strategy for wind MPPT operating on the optimum power curve is applied on the switch mode rectifier via controlling only one switch of the buck converter. The MPPT techniques have been tested at different modes of operation. Two nanogrids are interacted together in island mode to transfer additional power tracked for load sharing, and battery charge sharing. Finally, three nanogrids are gathered to perform hybrid generation types. The overall interactive sharing of power is illustrated by load sharing or battery charge sharing. This leads to the MPPT operation to be continuously working at all modes and a good prospective to decrease battery storage sizes