How to exploit sunlight toward maximum energy yield? Siemens solar tracking control is the universal solution to maximize the sun’s power – from PV and CSP to CPV. Answers for industry. © Ausra, Inc. Photovoltaic Parabolic trough Linear Fresnel 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 sun’s 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 2 these movements, the tracker system contributes to an increase of electricity production by more than 30% in celland 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. Controls Gear drives Communication Modular groups of primary products SIMATIC S7-1200 controller Gear drives Communication The new dimension in compact automation Tested with Siemens gear drives for solar tracking Simple networking between engineering, HMI panels and controllers with all tracking units The compact controller SIMATIC S7-1200 Cycle testing Long-term precision 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 SIMATIC S7-1200 supports TCP/IP native, ISO on TCP, as well as SIMATIC S7 communication Save position References position SCALANCE is the wide-range Ethernet network for field applications Tested with different motors Remote control interface/access System recovery Easy integration into a DCS system of the power plant, e.g. SIMATIC PCS 7 Extendable during field operation Networking of mixed power plants 3 Universal solar tracking contr L1 L2 L3 L1 N Reference switch CPU 1214C CPU 1214C DC motor Power supply 24V DC Ethernet SIRIUS 3RF2 Control & referencing Longitude Positioning Latitude Control Azimuth UTC Solar Position Pressure Algorithm (SPA) Temperature Positioning Elevation Atmospheric refraction Ethernet PWM + Control Pulses DC motor M PWM + Control Contro UTC Azimuth DC motor Pulses M Positioni Latitude Solar Position Pressure Algorithm Temperature (SPA) Control Zenith Longitude Control & ref Positioni Elevation Atmospheric refraction Contro Zenith NTP Control Center Control Status 4 Central station Control Center rol based on SIMATIC S7-1200 L1 N Reference switch Reference switch CPU 1214C Induction motor Induction motor SINAMICS G110 ferencing ng Ethernet DO fwd DO rev Induction motor Longitude Positioning M Latitude Control Pulses l h ng Control & referencing Solar Position Pressure Algorithm (SPA) Temperature UTC DO fwd DO rev Induction motor l Pulses M Azimuth Positioning Induction motor Pulses M DO f1 DO f2 DO dir Induction motor Control Elevation Atmospheric refraction Zenith NTP Pulses M NTP Control Central station Status DO f1 DO f2 DO dir Control Center Control Central station Status 5 % DB101 “SPA_Calc_SunVector_DB” % FB101 “SPA_Calc_SunVector_DB” … Longitude “SPA_DATA”. Latitude Latitude “SPA_DATA”. Pressure Pressure “SPA_DATA”. Temperature Temperature “SPA_DATA”. Elevation Elevation “SPA_DATA”. Delta_t Delta_t “SPA_DATA”. Atmos_Reflect Cockpit steering EN “SPA_DATA”. Longitude Azimuth Atmos_Reflect Zenith ENO “SPA_DATA”. Azimuth “SPA_DATA”. Zenith Single-unit application Field-wide application CPV solar tracker control software Highlights Universal tool for all solar applications Features Manual mode Applications Scalable tracking for small, medium and large-scale power plants Jog mode (forward, reverse) Open system for different motors Teach mode Integrated into the plant-wide control system Minimal energy consumption Secured control principles Synchronize azimuth and zenith position with the solar vector Complete solution for ramp up, recovery, operation, services, maintenance Teaching reference point switch Reaction to critical weather conditions 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 6 Dish engine Power tower Concentrated photovoltaic ... 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 doubleaxis 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 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°. This allows an accuracy of better than +/– 0.05° including mechanical tolerances if high precision gears from Siemens are used. Solar Vector The central PC-based HMI allows to monitor and control the actual status of each solar tracker unit via Ethernet connection. N % DB101 “SPA_Calc_SunVector_DB” E % FB101 “SPA_Calc_SunVector_DB” … Actual Azimuth position Actual Zenith position 1) Neither NREL nor the DOE endorse SIMATIC. “SPA_DATA”. Longitude EN Longitude “SPA_DATA”. Latitude Latitude “SPA_DATA”. Pressure Pressure “SPA_DATA”. Temperature Temperature “SPA_DATA”. Elevation Elevation “SPA_DATA”. Delta_t Delta_t “SPA_DATA”. Atmos_Reﬂect Azimuth Atmos_Reﬂect Zenith ENO “SPA_DATA”. Azimuth “SPA_DATA”. Zenith 7 Get more information solar.industry.automation@siemens.com Siemens AG Industry Sector Solar Siemensallee 84 76187 KARLSRUHE GERMANY www.siemens.com/solar-industry Subject to change without prior notice Order No.: E20001-A100-T112-V1-7600 DISPO 27903 WÜ/23782 GC.CC.Y93.SOL.52.0.03 WS 12092.0 Printed in Germany © Siemens AG 2009 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. 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