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264 4. DESIGN OF THE CONCENTRATION SYSTEM
FIGURE 4.25 Interface of pedestal tilting parameter distribution.
Heliostat tracking errors are mainly caused by concentrated solar
image shaking due to strong wind and regular deviation of the
heliostat solar image due to pedestal tilting. Thus heliostat tracking
errors are collected when the wind speed is low.
After heliostat deviation data are accumulated for a certain
while, the angles of heliostat pedestal tilting can be inversely
deduced according to tracking deviation features. By distributing
these angles to the local controller of the heliostat (Fig. 4.25),
satisfactory tracking effects still can be obtained even without
introducing deviation-correction procedures.
4.5 SOLAR FIELD DESIGN OF PARABOLIC TROUGH
POWER PLANT
The tracking rotation axis of a parabolic trough concentrator can be
arranged in a northesouth or westeeast manner, which enables the
concentrating surface to rotate around the pitch axis for single-axis tracking
of the Sun and ensure that the incident beam can be contained in the plane
determined by both the main normal and the focal line of the parabolic
