Establishing Local Solar Resource

The deplection of fossil fuel resouces on a wordwide basis has necessitated an urgent search for alternative energy sources to meet up the present day demands. Solar energy is clea, inexhaustible and environment-friendly potential resource among renewable energy otions. But neither a standalone solar photovoltaic syatem nor a wind energy system can provide a continuous supply of energy due to seasonal and periodic variations. Therefore, in order to satisfy the load demand, grid connected energy systems are now implemented thet combine solar and conventional convertion units. The objective of this project is to estimate the potential of grid quality solar photovoltaic power in Brasov area and finnaly develop a system based on the potential estimations made for a chosen are. Equipment specifications are provided based on the availability of the components finded on the web. Annual energy generation by proposed grid connected photovoltaic power plant is also calculated. In the last, cost estimation of grid connected photovoltaic power plant to show whether it is economically viable or not.

1. Establishing local solar resource

Establishing local solar energy resources: average solar irradiation, average daily and monthly electricity production, optimal inclination, global clear-sky irradiance and diffuse irradiance.

Estimated energy at local place generation is obtained based on solar radiation at the considered place ( 45,641 = 45°38’27,6” N ; 25,649 = 25°38’56,4” E).

In the following it is illustrate results obtained using JRC / PVGIS (EC Joint Research Center) obtained from: http://re.jrc.ec.europa.eu/pvgis

Location: 45°38'37" North, 25°39'18" East, Elevation: 593 m a.s.l.,

Fig1: Estimated available area with JRC / PVGIS

We estimate data for two inclinations: for zero inclination angle and for optimal inclination angle,

to see the differences.

I. Inclination angle 0°:

PVGIS estimates of solar electricity generation

Location: 45°38'37" North, 25°39'18" East, Elevation: 593 m a.s.l.,

Solar radiation database used: PVGIS-classic

Nominal power of the PV system: 70000.0 kW (crystalline silicon)

Estimated losses due to temperature: 7.3% (using local ambient temperature)

Estimated loss due to angular reflectance effects: 4.1%

Other losses (cables, inverter etc.): 30.0%

Combined PV system losses: 37.8%

Table1: Average electricity production and global irradiation for fixed system:

inclination=0°, orientation=0°

Month Ed Em Hd Hm

[kWh/day] [kWh/month] [kWh/m2/day] [kWh/m2/mounth]

Jan 59900 1860000 1.32 41.1

Feb 98400 2750000 2.13 59.6

Mar 156000 4830000 3.4 106

Apr 198000 5940000 4.47 134

May 248000 7690000 5.77 179

Jun 255000 7640000 6.04 181

Jul 262000 8110000 6.23 193

Aug 239000 7420000 5.66 176

Sep 178000 5330000 4.07 122

Oct 128000 3970000 2.9 89.8

Nov 68500 2050000 1.54 46.3

Dec 47200 1460000 1.06 33

Yearly average 162000 4920000 3.73 113

Total for year 59100000 1360

Ed: Average daily electricity production from the given system (kWh)

Em: Average monthly electricity production from the given system (kWh)

Hd: Average daily sum of global irradiation per square meter received by the modules of the given system (kWh/m2)

Hm: Average sum of global irradiation per square meter received by the modules of the given system (kWh/m2)