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Soltec-US-Arizona
Arizona
2016 | NORTH AMERICA | USA | 38 MW
SF Utility tracker equipment supply and installation for project developer Isolux Corsan.
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bahia soltec solar pv panels tracking plant 158 MW - Soltec
Bahia
2016 | SOUTH AMERICA | BRAZIL | 158 MW
SF Utility tracker equipment supply and installation.

Facing extreme weather conditions: How does SF7 fight against threatening and high-wind speed?

Facing extreme weather conditions: How does SF7 fight against threatening and high-wind speed?

Dynamic wind effects amplify considerably the torsional moment on the tracker structure

PV plants are often exposed to hazards that put the installation at risk, becoming an unpredictable economic investment. For this reason, single-axis solar tracker design must comply with a series of parameters that take into account the aeroelastic effects caused by the wind. Electronics improvement is also required to face weather phenomena such as cyclones, high winds or electrical storms.

Several studies have shown that certain wind-design code standards applied to solar trackers are insufficient to design these structures reliably, as they do not consider the second order effects produced by the action of wind on the tracker. In order to prevent related structural instability issues, it is necessary to find new analysis methodologies that improve the design of reliable tracker structures by quantifying their response to the second order effects of the wind. The wind consultant leader RWDI in collaboration with Soltec has developed an innovative method, Dy-WIND for comprehensive dynamic analysis in tracker array wind design. With 15 years specialist experience, Soltec has incorporated this method in the design of Soltec trackers.

It is observed that dynamic wind effects amplify considerably the torsional moment on the tracker structure. Reliable tracker design requires thicker-wall tubes and a motor support assembly of greater cross-section than those indicated when considering only static coefficients. As can be seen, the moment increment is found to be higher per the BAM approach than the DAF approach. Applying BAM results indicates a material increment in the cross-sections of structural profiles to gain strength and stiffness, and consequently, a proportional increase in the unit cost per tracker.

 

DY-WIND SYSTEM

Dy-WIND is a combination of Dynamic Amplification Factors (DAF) + Fluttering Analysis Methods (FAM) + Buffeting Analysis Methods (BAF) as a new standard in tracker multi-array. This system is the innovative and code-challenging analysis method applied to solar tracker wind-design, based on accurate wind-loading analysis.

A key finding is that while tracker response may be stable (damped signal output) with no risk of torsional galloping, the corresponding torque moment may be greater than the slewing drive or torque tube tolerances allow.

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