satee2010 pianu system abstract final

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Pianu project - solar and wind off-grid energy solution

D.Mirăștian, F.Andronescu1)

, and F.Fleșeriu2)

Energy specialist, Alba Local Energy Agency, Alba Iulia, Romania,1) Executive Manager, Alba Local Energy Agency, Alba Iulia, Romania

2)Manager, Ecovolt , Alba Iulia, Romania

daniel.mirastian@gmail.com

Summary: A system that provides electrical power using solar and wind energy is being

implemented near Alba Iulia, in Pianu village. Apart from being an off-grid hybrid energy

solution, something very rare in Romania at the moment, the system uses a wind turbine with

downwind rotor and stall regulation control and also maximum power point tracking (MPPT)

solar charging technology.

The turbine to be installed has specially shaped fiber-glass blades in order to minimize noise and

wind turbulence and maximize energy yield. Moreover, energy yield will be increased by manual

selection of 3 different slopes of the photovoltaic panels (17°, 44°, 63° - depending on the

season) coupled with the MPPT charging technology. Embedded electronics in the wind turbinewill provide energy management according to the wind speed and allow two-way wireless

communication with the turbine. It is possible to receive and display information from the wind

turbine and can also upload commands and operational settings.

Keywords: off-grid, energy, photovoltaic, downwind, turbine.

Motivation:

The motivation behind this project was to implement a small-scale project using multiple

renewable energy sources and set an example in Alba County. The County Council, through

Alba Local Energy Agency, has been a promoter of energy efficiency and renewable energy use.This project is meant to raise interest for the renewable energy field and encourage the

production of ”clean” energy in the area. The impact of this project will be amplified by theenvironmentally-friendly character of the sheepfold (fig. 1) for which the system will provide

power and by the many tourists this area attracts every year.

Fig. 1 Sheepfold powered by the off-grid energy system

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Results

The complete system consists of: wind turbine, solar panels, inverter, solar charge

regulator, DC electrical panel, AC electrical panel. The electrical diagram is presented in figure 2and the indoor installation is presented in figure 3.

So far the solar panels, inverter, solar charge regulator and electrical panels have been

installed and the sheepfold is already powered by the system. Total power for the solar panels is

1.05 kW (6 panels of 175 W each). Energy yield from the panels is expected to be around 4.7kWh/day during the summer and 1.8 kWh/day during the winter. The lack of energy coming

from the solar panels during winter is expected to be compensated by the wind turbine which

provides between 3 kWh/day during summer and 7 kWh/day during winter (based on the wind

potential evaluation of the area).

The installation of the 2.4 kW wind turbineiduring the following weeks will complete the

system and offer the chance to monitor and optimize energy production and consumption in

various weather conditions.

Fig. 2: Electrical diagram of the system Fig. 3: Indoor part of the system

i http://www.skystreamenergy.com/resources/downloads.php