PC-based control: TwinCAT solar position algorithm software library optimise solar energy harvesting.
The TwinCAT solar position algorithm software library enables high-precision determination of sun angles and the times for sunrise, solar noon and sunset all year round. The calculation of the sun angles with the TwinCAT library simply requires the specification of the date, time and exact longitude and latitude of the location (eg, through a GPS system). Depending on the required precision the algorithm can take into account additional parameters such as the time zone, the height above mean sea level, the slope of the ground or the orientation of the object, the air temperature and pressure, which influence atmospheric refraction. The algorithm can achieve an impressive precision of ±0,001°.
Areas of application include parabolic mirror systems with focusing mirrors of several metres diameter, which track the sun with great accuracy in order to focus the sun’s rays in an ideal focal point. This requires high-precision measurement of the sun angles. Photovoltaic installations that track the sun position also operate on this basis. Another area of application is building automation, where sensors alone are no longer sufficient to adequately deal with shading of large building façades. The Beckhoff software can also be used for exact calculation of shadow flicker from wind turbines, which is to be avoided in populated areas. The results allow individual turbines to be switched off if necessary.
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