Distributed PV grid-connected power station calculation

1. The main factors to be considered in the configuration of a distributed grid-connected power generation system u The installation location of the solar power system? What is the solar radiation situation in the place? Installation area? u Installation method (roof, slope, shade, facade, etc.) u The capacity of the grid-connected point? What is the grid-connected voltage?

2. Rooftop photovoltaic power station module installation power estimation u flat roof (concrete roof) photovoltaic module installation power calculation

Taking the Yantai area as an example, in the optimum inclination range (35 ° to 37 °), each KW component occupies about 15 square meters of roof area (15 square meters/KW).

U The installation power of the pitched roof (red tile roof) photovoltaic module is calculated. Generally, the pitched roof is tiled along the roof. If necessary, the maintenance channel should be considered, and the tiling should be 100 to 120W/m2 (10 to 12 square meters/KW).

Measurement of installed power of color steel tile roof photovoltaic module

Taking the Yantai area as an example, in the optimum inclination range (35 ° to 37 °), each KW component occupies about 15 square meters of roof area (15 square meters/KW).

3. Precautions on the DC side of the photovoltaic power station, the series current parameters of the components should be consistent; the parallel voltage parameters of the components should be consistent.

4. Transformer capacity constraints on the total power of photovoltaic modules, according to the requirements of the State Grid Q/GDW617-2011 document, the user side (380V) grid-connected, photovoltaic modules, grid-connected total power shall not exceed 25% of the maximum load of the transformer power supply in the grid-connected area.

5. Estimated power generation for the first year

Annual power generation in the first year = total installed power of photovoltaic modules X peak sunshine hours X system efficiency X365

Solar radiation energy, the energy (power) emitted by the sun in the form of radiation, in W, or KW.

U The intensity of solar radiation, the amount of solar radiation energy projected onto a unit area, in W/m2, or KW/m2.

The total amount of solar radiation, the amount of solar radiation energy that is irradiated per unit area over a period of time (hour, day, month, year).

The unit is KWh/m2 day (month, year).

U Sunshine time, from sunrise to sunset.

U sunshine hours, greater than 120W/m2 all times.

U Peak sunshine hours, irradiance greater than 120W/m2 or more, converted to 1000W/m2 sunshine hours, unit, is h.