Operation and maintenance phase of ground solar power-station ‘Ozerna’ started on April 28 in Yavoriv district of the Lviv oblast. It adds 10 MW of power to alternative energy capacities and stands for one more step to complete energy independence of the country. The main purpose of this solar power-station is making 100% ecologically safe “solar” electric power with the purpose of its further sale into national grid on green tariff. Designed productivity of the station is about 11 000 000 kW-h annually.
‘Ozerna’ project allows to examine basic trends of Ukrainian market of solar energy :
But but the headline is that there are companies in Ukraine, ready to implement most difficult and ambitious projects in Ukrainian solar energy. And one of such companies is our group, that took part in few stages of building of ‘Ozerna’ solar power-station, namely project design, equipment supply, starting-up and adjustment works.
Project design of ground solar power-station
One of features of construction process of this power-station was its location: land lot about 20 ha with very difficult topology, uneven slope of construction site in southward direction, and also composite topography from east to west, elevation difference is more than 40 meters.
It was necessary to take into account in the project, that bearing metalworks for installation of solar panels will be installed in places with various angle of slope. It was therefore necessary to pick up such angle of slope of solar batteries, that, from one side, would provide optimal conditions for sunbeams reception, and on the other hand, together with selection of corresponding interrow distance, would prevent mutual shading among separate arrays of solar batteries.
Our specialists performed necessary calculations, including 3d-modelling, and successfully designed ‘Ozerna’ solar power-station. Taking into account that all area of the power-station was divided into separate sub-areas, actually it was 10 different power-station project designs with different master layout plans, inverter circuit diagrams, unique cable networks etc.
Implementation of this project became even more complicated because engineer-geodesical and engineer-geological researches showed heavy soils heterogeneity, and project customer conducted geological planning of the area before construction work even started. This geological planning works partially removed topsoil layer, that prevented soil from crawling down on the slope. For this reason four types of pile foundations were used for installation of supporting metal structures. In order to optimize location of solar modules, on some areas of the solar power-station (starting complexes) project design provided possibility to install classic two-layer bearing structures with portrait orientation of solar panels. New approach was tested on some other areas: four-layer construction with landscape orientation of solar photo-electric modules.
Despite of difficult weather terms – because of upcoming season of rains fitters had to run into many problems (access of specialized building machinery to difficult construction areas was possible only with heavy caterpillar machines), starting-up and adjustment works were completed in record-breaking terms for this type of construction. We performed a package of starting-up and adjustment works related to preparation of operation and maintenance phase of inverter equipment for solar power-station and works on fine tuning of this equipment, including personnel training for future service support of the solar power-station.