I. Farkas1, I. Seres1 and L. KocsisS

department Physics and Process Control, Szent Istvan University (SZIU)
Peter K. u 1, H-2103 Gddollo, Hungary
Tel.: +36 28 522055, Fax: +36 28 410804, Email: ifarkas@fft. gau. hu

2Process Control Research Group, Hungarian Academy of Sciences-SZIU
Peter K. u 1., H-2103 Gddollo, Hungary

Abstract

In this paper a study has been carried out concerning to the preliminary design aspects of a 10 kWp photovoltaic grid-connected system.

Recently, the main issue was to select the most appropriate site for the installation of the area of about 160 m2 taking into consideration the shadowing-free solution. Three different places were considered including their advantages and disadvantages.

In order to make the final decisions for the selection the solar radiation income of the sites was modelled and calculated.

Introduction

In the framework of the PV Enlargement Project of the European Union, a 10 kWp photovoltaic system is under construction in the Godollo campus of the Szent Istvcn University, Godollo, Hungary. This set-up will be the largest PV instdlation in Hungary, and beside of the energy production it will serve as demonstration and educational purposes, as well.

The first step of the system determination, the finding the optimal site for the system is presented, along with the different alternatives. Until now the main units of the system were determined, and the type of the main elements were chosen. For the PV panels two different options are proposed as multicristalline and amorphous silicon technologies. The reason for the use of different technologies is the demonstration and educational purpose, such as the comparison of the different technologies at the same location under the same operating conditions.

The entire system is planned to consist of three different subsystems, about 3,3 kWp each. Every subsystem is planned to use an own inverter (the same type for each system). The system set-up includes the plan of the electrical connections and the mechanical installation to the roof, too.

Because of the educational and research purpose of the PV set-up, a detailed data logging system is planned to monitor every important data of the operation. The data logging system with the type of sensors and the monitored quantities are introduced.

Parallel with the system planning modelling was carried out for the determination of the behaviour of the system. Some modelling results are introduced. In the near future some preliminary measurements are to be carried out with the units available, first of all with the two types of PV panels. Beside some efficiency measurements the wavelength sensitivity of the efficiency will be analysed, as well. Another important factor, the effect of the shading is also planned to study along with different shape and size of shadowing, based on the measurements.