• Продажба на имоти Мелаинвест изгражда ваканционни и жилищни сгради и предлага апартаменти и помещения за продажба.
  • Строителство Мелаинвест извършва строителство и ремонти на сгради и съоръжения с модерна технология и високо-квалифицирани специалисти.
  • Строителни материали Меридиан комерс предлага богато разнообразие на строителни материали от утвърдени български и чужди производители.
  • Туроператорска дейност Paragon Management е модерна компания за управление и обслужване на хотелски комплекси.
  • Строителен надзор "Билдконсулт Енд Ко" ЕООД извърша оценяване на съответстивието на инвестиционните проекти и упражнява строителен надзор.
  • Новини Новини и официална информация от нашата компания.
  • Кариери Ако желаете да станете част от нашият екип, може да разгледате свободните работни позиции в момента.
  • Контакти Вижте адресите и телефоните на нашите отдели и компании за да се свържете с нас.

Info centre

Photovoltaic plant

in plot of land 151, Region Burgas in the territory of the city of Sredets

I.OVERVIEW

The present project has been developed at the request of the investor Nilolay Vasilev Todorov according toфренско Preliminary contract of adhesion signed between “EVN Bulgaria Electrical distribution “ Ltd. (Application 1) and sketch of land № 151-14 429sq.m with a visa for projecting issued by the main architect of the municipality of Sredec ( Application 2). Subject of the project is constructing of a photovoltaic plant with capacity 1123.2kWp, with subprojects: constructing of a supporting structure for installation of the photovoltaic panels; concrete complete transformer post (BKTP) 2x800 kVa- one-line scheme, the distribution and the outer grounding system; cable 20 kV; plaza cables1 кV.

II. TECHNICAL DESCRIPTION

1.PROCESS OF GENERATING OF ELECTRICITY

It is known that the term photovoltaic is used to name a photoelectric cell that transfers the light into electricity. i.e. it is designed to work as a generator of electricity. All photo elements work on the principle of the inner photo effect discovered by the French scientist Henry Bekerel in the year 1839. The essence of the inner photo effect is described easily with the Zone theory. The light that falls onto the atom increases the energy of the electrons from the valent zone which allows him to go in the zone of conductivity. Electric charges are released, this way and their directed movement in the external chain is electricity. Basic photo elements are produced from semi-conductors. Basic materials for the photo elements are monocrystalline silicon, polycrystalline silicon and thin photo elements. The photovoltaic panels, chosen for the project, are monocrystalline silicon photocells. In them the whole cell is one monocrystal from silicon, in which is formed a p-n transition. Monocrystals provide a relatively high degree of efficiency-around 14%. Main feature of each photovoltaic cell is its power. As the photovoltaic is constant current source, its power is calculated by P=U.I. In the volt-amper characteristics of photovoltaic can be distinguished three zones: In first zone (I), the electricity remains relatively constant with alternation in the voltage. In this area the photovoltaic cell behaves as a source of electricity. The second zone (II) is the zone of maximum power. The system for management must provide the work to fall within this zone in every moment of the use of photovoltaic. In the third zone (III) the photovoltaic behaves as a source of tension with internal resistance equal to Rc, which is due to the reduction of tension with the increasing of the current. current. The temperature affects the efficiency of the photovoltaic cells, usually the decrease of the temperature makes the filling factor to grow. Therefore, with the increase the temperature of the crystalline silicon photovoltaics , the coefficient of performance decreases.

2.EFFICIENCY OF PHOTOVOLTAICS

The efficiency of the photovoltaics depends on many factors, including temperature of the crystal, the spectrum of the light, sun orientation, geographic orientation, where it is installed, etc. It is the custom that all the parameters of the photovoltaics are given for specified conditions, called standards, namely: intensity of the light, which illuminates the photovoltaic - 1000 W/m2; photovoltaic temperature - 25 ° C; solar spectrum reference- AM1.5 The last figure is given in a unit called the air mass (Air Mass - AM). In Space there is no atmosphere, so it is said that the air mass there is 0- AM0. Exactly at noon, light falls nearly perpendicular to the ground and it passes the shortest distance through the atmosphere. This distance is considered as a unit and it is named AM1. The path of the light through the atmosphere affects its spectral structure and from there affects the efficiency of the photovoltaics. For this reason is accepted that the power of the panels is AM1.5. This responds to the average path of the light for the whole day for photovoltaics that are installed in latitudes with temperate climate like Bulgaria.

3.DATA FOR SOLAR RADIATION IN THE CHOSEN LOCATION

  • Location: 42°21'290" North, 27°10'767" East,
  • elevation: 130 m altitude,
  • Class of the land: agricultural region
  • Annual irradiation deficit due to overshadowing (horizontal): 0,0%
  • Rated power of the PV system: 1123,2 кВт (crystal silicon)
  • Optimal inclination angle: 32 degrees
  • Orientation (azimuth) of the modulе: 0,0 ° (optimal)
  • Estimated loss due to temperature: 8,3% (като се използва местна стайна температура)
  • Estimated loss due to angular reflection effects: 3%
  • Other loss (cables, inverter, etc.): 14,0%
  • Combined losses of the PV system 25,3%
Download the project