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Using common household thermal storages to support the PV- and battery system in nearly zero energy buildings in off-grid mode

  • This paper investigates the use of common thermal storage systems for demand side management in off-grid situations for nearly zero energy buildings. Typical parameters and characteristics were analyzed to develop mathematical models for freezers, water heaters and space heating/cooling. The models used in this work are based on simplified equations derived from differential equations. Simplified models of a battery storage and a PV-system have been added. Models for the thermal storages, PV-system and battery storage were merged to one system model. All models and simulations were designed and conducted with Matlab. Various pre-defined price based set point calculation algorithms were modified to work with the off-grid system based on the system’s voltage and available PV-power. Voltage and battery’s state of charge based algorithms are developed in this work. In a system with a freezer, water heater and space heating/cooling that is powered by a PV-system only, a possible battery storage capacity reduction of up to 50% with PV-powerThis paper investigates the use of common thermal storage systems for demand side management in off-grid situations for nearly zero energy buildings. Typical parameters and characteristics were analyzed to develop mathematical models for freezers, water heaters and space heating/cooling. The models used in this work are based on simplified equations derived from differential equations. Simplified models of a battery storage and a PV-system have been added. Models for the thermal storages, PV-system and battery storage were merged to one system model. All models and simulations were designed and conducted with Matlab. Various pre-defined price based set point calculation algorithms were modified to work with the off-grid system based on the system’s voltage and available PV-power. Voltage and battery’s state of charge based algorithms are developed in this work. In a system with a freezer, water heater and space heating/cooling that is powered by a PV-system only, a possible battery storage capacity reduction of up to 50% with PV-power based and up to 36% with SOC based algorithms compared to the same system with fixed set point thermostatic control could be achieved. Additionally, the capacity could even be reduced by up to 18% by solely reacting to voltage drops.show moreshow less

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Metadaten
Author:Tobias Häring, Argo RosinORCiD, Helmuth Biechl
DOI:https://doi.org/10.1016/j.seta.2019.05.014
Identifier:2213-1388 OPAC HS OPAC extern
Parent Title (English):Sustainable Energy Technologies and Assessments
Publisher:Elsevier
Place of publication:Amsterdam
Document Type:Article
Language:English
Date of Publication (online):2019/06/04
Year of first Publication:2019
Tag:Demand side management; Off-grid; Renewable energy; Thermal storage; nZEB
Volume:Volume 35
Issue:October 2019
Number of pages:13 Seiten
First Page:12
Last Page:24
Institutes:Fakultät Elektrotechnik
IEES - Institut für Elektrische Energiesysteme
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 60 Technik
6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften
Research focus:FSP1: Energie
Publication Lists:Biechl, Helmuth
Publication reviewed:begutachtet
Release Date:2020/09/14
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