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Answers for industry.
How to exploit sunlight toward maximum energy yield?
Siemens solar tracking control is the universal solution to maximize the suns power from PV and CSP to CPV.
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The universal solution for solar tracking applications ...
A solar tracking system controls double axis movements azimuth and zenith of Photovoltaic (PV) and Concentrated Solar Power (CSP) Plants. The panels or mirrors are pointed directly towards the suns radiation in order to maximize exploitation of the sunlight and to ensure exact alignment of the receiver and the angle of the sun. Thanks to
Photovoltaic Parabolic trough Linear Fresnel
these movements, the tracker system contributes to an increase of electricity production by more than 30% in cell- and thin film-based technologies. For Concentrated Photovoltaic (CPV) and CSP a precise tracking control system is the unconditional prerequisite for the production of stable and efficient electrical power.
Ausra, Inc.
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Solar Vector
Actual Azimuth position
E
N
Actual Zenith position
% DB101"SPA_Calc_SunVector_DB"
% FB101"SPA_Calc_SunVector_DB"
EN
Atmos_Reflect
Delta_t
ENO
Zenith
Azimuth
Elevation"SPA_DATA".Azimuth
...
"SPA_DATA".Longitude
"SPA_DATA".Latitude
"SPA_DATA".Pressure
"SPA_DATA".Temperature
"SPA_DATA".Elevation
"SPA_DATA".Delta_t
"SPA_DATA".Atmos_Reflect
"SPA_DATA".Zenith
Temperature
Pressure
Latitude
Longitude
... from Siemens.
The universal tracking control system by Siemens fits each application in solar from low-end PV single-axis movements to high-end CPV double-axis movements.
Each single-unit solar tracker is perfectly controlled by a SIMATIC S7-1200 controller.
The precise adjustment of azimuth and zenith axes occurs based on the astronomical algorithm with 64-bit arithmetic accuracy which precisely secures the requirements of even CPV systems.
The central PC-based HMI allows to monitor and control the actual status of each solar tracker unit via Ethernet connection.
The Solar Positioning Algorithm used in the Siemens tracking control software is based on SPA software developed by the National Renewable Energy Laboratory, NREL, for the U.S. Department of Energy, DOE1).
This algorithm is specified with leading edge accuracy of +/ 0.0003. The Siemens control software converts this algorithm into a resolution of +/ 0.002. This allows an accuracy of better than +/ 0.05 including mechanical tolerances if high precision gears from Siemens are used.
Dish engine Power tower Concentrated photovoltaic
1) Neither NREL nor the DOE endorse SIMATIC.7
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Modular groups of primary products
SIMATIC S7-1200 controller Gear drives Communication
The new dimension in compact automation
The compact controller SIMATIC S7-1200
SIMATIC HMI with integrated engineering system SIMATIC STEP 7 Basic
High flexibility for smart solutions with scalable hardware
Fast engineering for programming and commissioning
Accurate positioning thanks to 64-bit resolution
Tested with Siemens gear drives for solar tracking
Cycle testing
Long-term precision
Save position
References position
Tested with different motors
System recovery
Simple networking between engineering, HMI panels and controllers with all tracking units
SIMATIC S7-1200 supports TCP/IP native, ISO on TCP, as well as SIMATIC S7 communication
SCALANCE is the wide-range Ethernet network for field applications
Remote control interface/access
Easy integration into a DCS system of the power plant, e.g. SIMATIC PCS 7
Extendable during field operation
Networking of mixed power plants
Controls Gear drives Communication
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Universal solar tracking contr
Ethernet Control & refEthernetControl & referencing
Inductionmotor
Reference switchCPU 1214C
M
M
CPU 1214C
SolarPosition
Algorithm(SPA)
Positioning
Control
Azimuth
Positioni
Contro
Azimuth
Positioning
Control
Zenith
Positioni
Contro
Zenith
Control Center Control Center
L1L2L3
L1N
Power supply24V DC SIRIUS 3RF2
Longitude
Latitude
UTC
Pressure
Temperature
Elevation
Atmosphericrefraction
PWM + Control
Pulses
NTP
Control
Status
Central station
DC motor
DC motorPWM + Control
Pulses
Longitude
Latitude
UTC
Pressure
Temperature
Elevation
Atmosphericrefraction
SolarPosition
Algorithm(SPA)
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rol based on SIMATIC S7-1200
ferencing
Inductionmotor
Reference switch
Ethernet Control & referencing
Inductionmotor
Reference switchCPU 1214C
M
M
M
M
ng
l
h
Positioning
Control
Azimuth
ng
l
Positioning
Control
Zenith
Control Center
Induction motor
L1N
SINAMICSG110
Central station Central station
NTP
Control
Status
Pulses
Induction motor
DO fwdDO rev
DO fwdDO rev
Pulses
Induction motor
Induction motor
NTP
Control
Status
Pulses
DO f1 DO f2DO dir
Pulses
DO f1 DO f2DO dir
Longitude
Latitude
UTC
Pressure
Temperature
Elevation
Atmosphericrefraction
SolarPosition
Algorithm(SPA)
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CPV solar tracker control software
Highlights
Universal tool for all solar applications
Open system for different motors
Minimal energy consumption
Secured control principles
Features
Manual mode
Jog mode (forward, reverse)
Teach mode
Synchronize azimuth and zenith position with the solar vector
Teaching reference point switch
Auto mode
Follow the sun
Auto referencing during night time
Move to stow position in case of an emergency
Move to safe position after sunset
Applications
Scalable tracking for small, medium and large-scale power plants
Integrated into the plant-wide control system
Complete solution for ramp up, recovery, operation, services, maintenance
Reaction to critical weather conditions
Cockpit steering Single-unit application Field-wide application
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Get more information
www.siemens.com/solar-industry
Subject to change without prior notice Order No.: E20001-A100-T112-X-7600DISPO 27903W/23782 GC.GC.93.YSOL.52.0.01 WS 1109X.Printed in Germany Siemens AG 2009
Siemens AGIndustry SectorSolarSiemensallee 8476187 KARLSRUHEGERMANY
The information provided in this brochure contains merely general descriptions or characteristics of performance which in actual case of use do not always apply as described or which may change as a result of further development of the products. An obligation to provide the respective characteristics shall only exist if expressly agreed in the terms of contract.
All product designations may be trademarks or product names of Siemens AG or supplier companies whose use by third parties for their own purposes could violate the rights of the owners.
ES5419Hervorheben11092.
