Search

This paper presents the determination of solar cell (SC) characteristics in double-exponential modelling using current-voltage ( I–V ) curve data for one-illumination level. The approach of the numerical analysis is based on the Newton-Raphson technique. Particular attention has been paid throughout to the set-up of the initial values to provide the best convergence of the iteration procedure and high accuracy of determined parameters.

This paper presents the operation and performance evaluation of PV-wind hybrid systems installed at Gobi desert area of Mongolia in order to identity the key factors that determines system operation at a severe climate conditions. The installed hybrid systems consist of 5 kW PV, 3 kW wind systems, BOS (balance of systems), data acquisition and transmission equipments. The Naran soum of Sukhbaatar aimag, where main systems are installed, is located on the semi desert area of Mongolia, north 45/spl deg/ 3' east 113/spl deg/ 5' and 700 km away from Ulaanbaatar.

In this paper, considered assessment is made of the potential of the photovoltaic (PV) technology in Mongolia. The authors describe the specific social-economic conditions of the pastoral livestock of Mongolia and show that PV power systems are the most suitable source of electricity and widely applicable for numerous different purposes. It is concluded that there is a significant market potential for use of PV power systems by the decentralized users of the Mongolian rural communities. Strategies for the future development of PV power technology in Mongolia are also discussed.

Analysis of solar cell current-voltage (I-V) characteristics and spectral response data are essential for determining the key device parameters during cell research and development. Several methods for testing and analysis of solar cell characteristics have been developed with varying degrees of automation. In most cases these methods involve a minimisation procedure to determine the I-V and spectral response curve parameters from experimental data. However, the majority of these methods usually give different results from each other and lead to incorrect or physically impossible values for some parameters, because of poor starting values. In this paper the determination of solar cell parameters from experimental data of the illuminated I-V characteristic using a two-exponential equation is considered. The approach used here is based on a simultaneous equation method, as one of the more appropriate means for the numerical analysis of the I-V curve, in order to gain good starting values.