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VSF – An Opportunity to Optimize Transient Processes in Line-Focus CSP Power Plants

Noureldin, Kareem and Hirsch, Tobias and Pitz-Paal, Robert (2016) VSF – An Opportunity to Optimize Transient Processes in Line-Focus CSP Power Plants. SolarPACES 2016, 11.-14.Okt.2016, Abu Dhabi, UAE.

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Abstract

Optimizing solar field operation and control is a key factor to improve the competitiveness of line-focus solar thermal power plants. However, the risks of assessing new and innovative control strategies on operational power plants hinder such optimizations and result in applying more conservative control schemes. In this paper, we describe some applications for a whole solar field transient in-house simulation tool developed at the German Aerospace Centre (DLR), the Virtual Solar Field (VSF). The tool offers a virtual platform to simulate real solar fields while coupling the thermal and hydraulic conditions of the field with high computational efficiency. Using the tool, developers and operator can probe their control strategies and assess the potential benefits while avoiding the high risks and costs. In this paper, we study the benefits gained from controlling the loop valves and of using direct normal irradiance maps and forecasts for the field control. Loop valve control is interesting for many solar field operators since it provides a high degree of flexibility to the control of the solar field through regulating the flow rate in each loop. This improves the reaction to transient condition, such as passing clouds and field start-up in the morning. Nevertheless, due to the large number of loops and the sensitivity of the field control to the valve settings, this process needs to be automated and the effect of changing the setting of each valve on the whole field control needs to be taken into account. We used VSF to implement simple control algorithms to control the loop valves and to study the benefits that could be gained from using active loop valve control during transient conditions. Secondly, we study how using short-term highly spatially-resolved DNI forecasts provided by cloud cameras could improve the plant energy yield. Both cases show an improvement in the plant efficiency and outlet temperature stability. This paves the road for further investigations of new control strategies or for optimizations of the currently implemented ones.

Item URL in elib:https://elib.dlr.de/107063/
Document Type:Conference or Workshop Item (Speech)
Title:VSF – An Opportunity to Optimize Transient Processes in Line-Focus CSP Power Plants
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Noureldin, KareemKareem.Noureldin (at) dlr.dehttps://orcid.org/0000-0003-3833-2425
Hirsch, TobiasTobias.Hirsch (at) dlr.deUNSPECIFIED
Pitz-Paal, RobertRobert.Pitz-Paal (at) dlr.dehttps://orcid.org/0000-0002-3542-3391
Date:12 October 2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Line-Focus, transient, Simulation, optimization
Event Title:SolarPACES 2016
Event Location:Abu Dhabi, UAE
Event Type:international Conference
Event Dates:11.-14.Okt.2016
Organizer:SolarPACES
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Advanced Heat Transfer Media (old)
Location: Stuttgart
Institutes and Institutions:Institute of Solar Research > Linienfokussierende Systeme
Deposited By: Noureldin, Kareem
Deposited On:01 Dec 2016 19:23
Last Modified:01 Dec 2016 19:23

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