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SOLAR TO AC POWER SOURCE FOR REMOTE AREAS USING SEIG

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Author(s): MEHMET AKBABA | KHALED AL-RUWAIHI

Journal: Journal of Engineering Science and Technology
ISSN 1823-4690

Volume: 7;
Issue: 1;
Start page: 25;
Date: 2012;
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Keywords: AC power | Photovoltaic generators | Remote areas | SEIG | MPPT | Energy efficiency

ABSTRACT
Photovoltaic generators (PVG) are increasingly used to provide electricity in remote areas. However, in many applications the DC generated electricity by a PVG need to be converted to AC. Traditionally DC to AC inverters have been widely used for this purpose. In this paper, a different system is proposed in which a self excited induction generator (SEIG) driven by a permanent magnet DC motor (DCM) and powered from a PVG through a maximum power point tracker (MPPT) are used. A step-up chopper is utilized as an MPPT unit. The proposed system is modelled in time domain, and a detailed transient and steady-state analysis are presented. The main reason behind analyzing the system in the time domain is because of the fact that for unknown speeds, the methods developed for steady-state analysis of SEIGs can not be applied. The presented work shows that the full available power of the PVG can be harnessed by selecting suitable values for the duty cycle and the frequency of the step up chopper and the excitation capacitor of the SEIG. It is also shown that with such a combination power utilization efficiency of more than 83% can be achieved.
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