V. Salas

500 W Class-D Single-Stage Power Supply

This paper proposes the use of a single-stage PFC converter to feed those cost-effective applications which must comply with class D limits of IEC 61000-3-2 in the range of 500 W. The circuit operation, design guidelines of the converter have been presented for both European and universal line-voltage range. Finally, experimental results are provided in order to check the performance of the proposed converter and its design

Analysis Between Energy Efficiency and European Efficiency

The object of this paper is the analysis of European efficiency. It consists of a formula introduced in 1991 whose coefficients are, at the moment, constant and independent of latitude. The weighting European Efficiency factors refer to the irradiance distribution in north-western Germany at that time. These factors are therefore not necessarily representative for all parts of Europe, especially not for southern Europe. However, today they provide a well established value for a quick comparison of conversion efficiency of inverters. In a similar way, this paper will discuss how those coefficients vary in function of latitude and the tracking type.

Degradation and others parameters analysis of different technologie photovoltaic modules

This paper discusses and analyzes the degradation of five PV modules of different actual technologies with long-time outdoors exposure. The degradation losses are analyzed by means of the following parameters: short circuit current, open circuit voltage and power. At the same time, this paper compares the degradation of five different technology modules, measured in the same place with the same equipment that captures the parameters measured. It explains the degradation of the modules over time to take into account all the calculations for decision making when designing a photovoltaic installation. Each one of them was set outdoor at the Universidad Carlos III de Madrid, Leganes (Madrid), Spain.

Maximum power point tracking efficiency in the photovoltaic grid inverters of 100 kW

The aim of this article is to describe how closely the low voltage small grid-connected PV inverters of 100 kW operate at the actual maximum power point. To carry this study out, three, 50 Hz three-phase inverters, from different manufacturers, were selected from the European market. Each one of them was put into an outdoor grid-connected system installed in different locations in the South of Spain (Seville and Murcia). PV voltage, current and power generation with respect to irradiance, cells temperature and local time were measured under different meteorological conditions. The maximum power point voltage and the ratio between PV current and irradiance were analysed.