Your Benefits
■ Increased and more predictable revenue by complying with the dispatch schedule as closely as possible
■ Avoidance of penalties through flexible responsiveness to requirements of the dispatcher
■ Protection of sensitive plant components like heat exchangers and turbine by limiting thermal stress
SPPA-P3000 Dispatch Control for Solar Hybrid Plants (ISCC) enables the best fulfillment of your committed dispatch schedule even under unstable weather conditions. Flexible reactions to fluctuating solar radiation become possible and, in the end, result in increased revenue.
The Task
Operators of solar thermal and solar-hybrid plants (Integrated Solar Combined Cycle, ISCC) usually commit to a particular production on the basis of weather forecasts. Due to fluctuating solar heat sources, it is challenging for those plants to fulfill the required dispatch schedule.
To maximize revenue and to avoid contractual penalties, optimum adherence to commitments has to be achieved.
The centerpiece of this solution is a unique solar field control which fully automatically coordinates the optimal change request for increasing or decreasing heat requirements. If the solar power is not sufficient, auxiliary heating or thermal storage can be used to cover the gap.
Obviously, thermal limits are taken into account and sensitive plant components are protected against excessive stress.
The solution SPPA-P3000 Dispatch Control for
Solar-Hybrid Plants can be easily integrated into any existing I&C system with several interfaces.
It is also suitable for plants with a low degree of automation and without a uniform control system.
Optimized solar field performance in all conditions: On sunny days, fast start-up and maximum load without the use of the
NG-Heater. On cloudy days, start-up despite heavy clouds, maximum load achieved when solar radiation is high.
Our Solution
SPPA-P3000 Dispatch Control allows for meeting dispatch requirements, even if actual weather conditions do not match forecasts:
During phases of low solar radiation, the plant doesn’t have to be shut down, but it remains in operation at reduced load. Thus, maximum load is achieved as soon as radiation is high again.
If solar radiation is higher than expected, steam production is reduced in a controlled way.
The dispatch control solution coordinates all major components like solar field, heat exchangers, turbine and auxiliary firing or thermal storages, if available, complying with limits of the heat exchangers. By the intelligent coordination of adjustments of the solar mirrors, of the oil flow distribution and by temperature regulation of the steam pressure, turbine heat is always kept as high as possible.
Thus, running the turbine is also ensured under adverse weather situations.
Sunny day
Cloudy day
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Natural gas
Steam pressure
Time
Time
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Load
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Solar radiation

Published by and copyright © 2013:
Siemens AG, Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
For more information contact
SPPA-P3000.energy@siemens.com
www.siemens.com/energy/sppa-p3000
Siemens Energy, Inc.
Instrumentation, Controls, & Electrical
1345 Ridgeland Parkway, Suite 116
Alpharetta, GA 30004, USA
P342DC_FS_DispContr_e_v1-0
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Subject to change without prior notice.
The information in this document contains general descriptions of the technical options available, which may not apply in all cases.
The required technical options should therefore be specified in the contract.