Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Solar Panels Track the Sun For More Efficiency

31.01.2011
Photovoltaic modules equipped with a moveable mounting and a new control system from Siemens are able to precisely follow the course of the sun.

Thanks to a new algorithm based on astronomical data, the solar panels track the sun in line with not only the time of day but also the time of year and the precise geographical location of the photovoltaic installation. As a result, their energy yield is more than 35 percent higher than fixed systems.


A decisive factor in the efficiency of a photovoltaic system is the angle of incidence at which sunlight strikes the surface of the module. In the case of fixed panels, sunlight hits the solar cells at an oblique angle for most of the day. A maximum yield in terms of energy and therefore electricity is only achieved when sunlight strikes the cells perpendicular to their surface. So the obvious solution is to fit the solar modules to a movable tracking system that precisely follows the course of the sun. The sun’s position depends on not only the time of day but also the time of year and the location of the photovoltaic installation. The Simatic S7-1200 control system from Siemens therefore calculates the perfect alignment for the solar modules on the basis of their precise location, anywhere in the world, and the exact time and date.

This calculation is based on the “Simatic Library for Solar Position Algorithm,” which is stored in every control unit. Siemens obtained a license for the very precise algorithm from the National Renewable Energy Laboratory (NREL) in the U.S. On this basis, the control system is able to determine the position of the sun to an accuracy of 0.0003° and align the photovoltaic module accordingly. Three-phase AC motors power a dual-axis tracking system: This swivels the module in a semicircle along the azimuthal axis, thus tracking the sun’s daily course from east to west, and tilts the module along the zenithal axis, tracking the height of the sun according to the time of day and year. In the process, the control system also prevents neighboring modules from overshadowing one another during the morning and evening hours, when shadows are especially long. The software bases its astronomical calculations on parameters such as longitude, latitude, and the exact time.

In addition, the control system can also take weather conditions into account. When faced with high winds, for example, it moves the modules to a position of least resistance, where they can withstand winds of up to 130 kilometers per hour. In a similar manner, the tracking system can be programmed to react to snow, thunderstorms, fog, and darkness.

Dr. Norbert Aschenbrenner | Siemens InnovationNews
Further information:
http://www.siemens.com/innovationnews

More articles from Power and Electrical Engineering:

nachricht Improved stability of plastic light-emitting diodes
19.04.2018 | Max-Planck-Institut für Polymerforschung

nachricht Intelligent components for the power grid of the future
18.04.2018 | Christian-Albrechts-Universität zu Kiel

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Molecules Brilliantly Illuminated

Physicists at the Laboratory for Attosecond Physics, which is jointly run by Ludwig-Maximilians-Universität and the Max Planck Institute of Quantum Optics, have developed a high-power laser system that generates ultrashort pulses of light covering a large share of the mid-infrared spectrum. The researchers envisage a wide range of applications for the technology – in the early diagnosis of cancer, for instance.

Molecules are the building blocks of life. Like all other organisms, we are made of them. They control our biorhythm, and they can also reflect our state of...

Im Focus: Spider silk key to new bone-fixing composite

University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.

Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.

Im Focus: Writing and deleting magnets with lasers

Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.

Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...

Im Focus: Gamma-ray flashes from plasma filaments

Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.

The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...

Im Focus: Basel researchers succeed in cultivating cartilage from stem cells

Stable joint cartilage can be produced from adult stem cells originating from bone marrow. This is made possible by inducing specific molecular processes occurring during embryonic cartilage formation, as researchers from the University and University Hospital of Basel report in the scientific journal PNAS.

Certain mesenchymal stem/stromal cells from the bone marrow of adults are considered extremely promising for skeletal tissue regeneration. These adult stem...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

IWOLIA: A conference bringing together German Industrie 4.0 and French Industrie du Futur

09.04.2018 | Event News

 
Latest News

Structured light and nanomaterials open new ways to tailor light at the nanoscale

23.04.2018 | Physics and Astronomy

On the shape of the 'petal' for the dissipation curve

23.04.2018 | Physics and Astronomy

Clean and Efficient – Fraunhofer ISE Presents Hydrogen Technologies at the HANNOVER MESSE 2018

23.04.2018 | Trade Fair News

VideoLinks
Science & Research
Overview of more VideoLinks >>>