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In order to compensate for their cost, photovoltaic (PV) systems need to be operated in a manner that ensures the optimum use of the available solar energy. This is achieved by means of a Power Conditioning Unit (PCU) which in most cases consists of a dc-dc converter connected between the PV source and the load. The role of the dc-dc converter control is to ensure operation of the PV array at its maximum power point (MPP) regardless of atmospheric conditions and load variations. This thesis presents a fast converging digital maximum power point tracking (MPPT) control that is based on...