Beijing Lewei IOT Technologies Co., Ltd.

Basic Guidelines for Solar Power Station Irradiance Monitoring

Qualified data on energy resources and potential energy production can be minimized by high-precision field measurements of solar radiation. Such measurements are made through a high quality solar radiation monitoring station and can measure all three components of solar radiation: normal direct radiation (DNI), horizontal scattered radiation (DHI) and total horizontal radiation (GHI).

In addition, temperature, humidity, precipitation, wind speed and wind direction and other meteorological parameters related to the project also need to be monitored by professional weather stations. A complete solar monitoring station includes: one is installed on the automatic solar tracker, is used to measure the direct radiation of DNI tables, one for the measurement of DHI solar shading radiation intensity meter, and is used to measure the intensity of the solar shading radiation of GHI, and one for the collection and storage of measured values, high-performance solar inverter data logger.

A simple photovoltaic device

For rooftop installation, building integrated photovoltaic (BIPV) system and ground type photovoltaic power plant (kilowatt level), solar radiation measurement can greatly improve the monitoring effect of solar system performance.

Raise the level of innovation to new levels

In large and medium-sized photovoltaic installations (over 1 mw), uncertainty in energy production efficiency can have a great impact on project profitability. For a power plant with a rated capacity of several megawatts, even if the measurement uncertainty is only a few percent, the energy production forecast will change significantly, thus having a direct impact on the profit and loss!

Tracking system considerations

A photovoltaic system with uniaxial or biaxial tracking ensures a high level of radiation exposure throughout the day, significantly increasing the output of the solar panels. To monitor system performance, POA and GHI radiation should be measured using a high quality pyrheliometer (ISO9060 class ii standard). The actinometer can be mounted on a solar panel tracker or a professional high-precision solar inverter data logger.

Make up some CPV solutions

CPV systems use optics to focus large areas of sunlight onto a solar panel, either refracting (using a lens) or reflecting (using a mirror). In order to achieve a high focusing rate, optical devices use a narrow field of view and only use the direct normal radiation of the sun (DNI). The DNI can be measured most accurately with the help of a high-quality direct solar meter mounted on an automatic sun tracker, thus providing reliable data on solar radiation inputs. This is an advanced system with an actinometer for measuring scattering and total radiation (DHI and GHI), which verifies the reliability of DNI measurements.
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