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Pham, C.-T. (2019). Assessment of energy storage systems for power system applications based on equivalent circuit modeling. (Doctoral dissertation). Stockholm: KTH Royal Institute of Technology
Open this publication in new window or tab >>Assessment of energy storage systems for power system applications based on equivalent circuit modeling
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Climate change triggered the rethinking of our current energy system. A restructuring is necessary and in progress with the goal to improve our energy supplychain in efficiency and sustainability. This has led to the increased use of renewable energy sources such as solar and wind power. In 2017 wind power surpassed all other sources, including oil, nuclear, coal, except gas in terms of total installed capacity. Renewable energy sources became an integral part in our energy systemand will continue to grow in the future. However, what is often forgotten ist hat these sources introduce high variability in the provision of power. Variability implies a lack of control over the availability of electricity, which seldom matches with the concurrent demand. Energy storages have been highlighted as a viable solution in managing arising imbalances and maintaining the security of supply. Nevertheless, numerous technologies and application possibilities exist, each unique in their characteristics and requirements. Not every energy storage works in every situation, which naturally raises the question: How can we choose the optimal storage for any application?

To answer this question we developed an unified model approach for all energy storages based on the equivalent circuit model. The key idea is to provide a direct way of comparing and assessing energy storages, i.e., by simulating and analyzing their performances for different applications. Differences in performance become visible in investigating the dynamic behavior. We proposed a general model, which effectively represents energy storages of different types (electrical, mechanical, hydraulicetc.) and includes their main characteristics (also non-linearity). Secondly, the proposed models have been validated through an experimental setup to test energy storages under changing operations. Subsequently, a sizing routine has been implemented to optimally size an energy storage system for any type of application. Based on this approach the energy storages can be easily compared and important key parameters such as efficiency, rated power, energy capacity etc., can be derived. Finally, the proposed models and methods are applied to various power system applications. A suitability index is introduced to measure the qualification of an individual energy storage for the selected applications. Alternatively, an evaluation method based on fuzzy logic has been explored. Both suitability index and fuzzy logic can effectively determine and rank the suitability of energy storages.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2019. p. 69
Series
TRITA-EECS-AVL ; 2019:3
Keywords
Energy storage system; Assessment; Equivalent circuit model; Suitability;
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering; Energy Technology
Identifiers
urn:nbn:se:kth:diva-240089 (URN)978-91-7873-053-7 (ISBN)
Public defence
2019-01-25, 4301 Kollegiesalen, Brinellvägen 8, Stockholm, 10:00 (English)
Opponent
Supervisors
Projects
STandUP for Energy
Note

QC 20181211

Available from: 2018-12-14 Created: 2018-12-11 Last updated: 2018-12-14Bibliographically approved
Pham, C.-T. & Månsson, D. (2018). Experimental validation of a general energy storage modelling approach(Part III). Journal of Energy Storage, 20, 542-550
Open this publication in new window or tab >>Experimental validation of a general energy storage modelling approach(Part III)
2018 (English)In: Journal of Energy Storage, E-ISSN 2352-152X, Vol. 20, p. 542-550Article in journal (Refereed) Published
Abstract [en]

Current challenges in the electric grid progression demand energy storages to cope with any imbalances betweensupply and demand side. Application possibilities of energy storages are numerous, but the requirements varyfrom case to case. However, not every storage technology operates equally to be useful in any situation. In fact,the feasibility of energy storages depend on their technical characteristics, i.e., for example efficiency, responsetimes, power rating and capacity for a selected application. Comparing and assessing different storage options isimperative for decision-making, which requires an in-depth understanding of the technology and its dynamics.Hence, a general model approach of energy storages as equivalent circuit models has been proposed to unify andanalyze storages of different physical backgrounds. This allows a more direct and intuitive evaluation of energystorages tested in a specific application. This paper focuses on the experimental validation of energy storages(ultra-capacitor, li-ion battery, lead-acid battery and flywheel) to be uniformly described in one general model. Asimple and budget friendly experimental setup to test the storages is designed.

Keywords
Energy storage, Li-ion battery, Lead-acid battery, Double-layer capacitor, Flywheel, Equivalent circuit
National Category
Energy Systems
Research subject
Electrical Engineering; Energy Technology
Identifiers
urn:nbn:se:kth:diva-238589 (URN)10.1016/j.est.2018.09.023 (DOI)000451147100052 ()2-s2.0-85055878495 (Scopus ID)
Projects
STand UP for Energy
Note

QC 20181106

Available from: 2018-11-05 Created: 2018-11-05 Last updated: 2018-12-18Bibliographically approved
Pham, C.-T., Månsson, D., Hilber, P. & Shayesteh, E. (2018). Reliability consideration in the energy storagesystem design process. In: 2018 IEEE International Conference on Probabilistic Methods Applied to Power Systems (PMAPS): . Paper presented at 2018 IEEE International Conference on Probabilistic Methods Applied to Power Systems (PMAPS). IEEE
Open this publication in new window or tab >>Reliability consideration in the energy storagesystem design process
2018 (English)In: 2018 IEEE International Conference on Probabilistic Methods Applied to Power Systems (PMAPS), IEEE, 2018Conference paper, Published paper (Refereed)
Abstract [en]

Energy storage systems are an important asset inthe future power grid, ensuring the safety and reliability inface of growing power consumption and intermittent supply.Occupying a vital role, the reliability of the storage system itselfhas to be guaranteed and taken into account for, especially inthe design procedure. This study utilizes reliability methods toanalyze the storage’s system reliability and optimize the systemsize to an appropriate level. A residential building with a 3.3kWphotovoltaic system serves as a case study to analyze differentenergy storage types and their resulting optimum systemstructure. The paper also includes an economic evaluation tomeasure the storage’s suitability for the particular case with thephotovoltaic system.

Place, publisher, year, edition, pages
IEEE, 2018
Keywords
Energy storage system;reliability;Simulation.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering; Energy Technology
Identifiers
urn:nbn:se:kth:diva-234661 (URN)10.1109/PMAPS.2018.8440422 (DOI)2-s2.0-85053164028 (Scopus ID)978-1-5386-3596-4 (ISBN)
Conference
2018 IEEE International Conference on Probabilistic Methods Applied to Power Systems (PMAPS)
Projects
StandUp for Energy
Note

QC 20180921

Available from: 2018-09-07 Created: 2018-09-07 Last updated: 2018-09-21Bibliographically approved
Pham, C.-T. & Månsson, D. (2015). Suitability analysis of Fuzzy Logic as an evaluation method for the selection of energy storage technologies in Smart Grid applications. In: Smart Electric Distribution Systems and Technologies (EDST), 2015 International Symposium on: . Paper presented at International Symposium on Smart Electric Distribution Systems and Technologies (EDST) CIGRE SC C6 Colloquium, Vienna, Austria - September 8-11, 2015. IEEE
Open this publication in new window or tab >>Suitability analysis of Fuzzy Logic as an evaluation method for the selection of energy storage technologies in Smart Grid applications
2015 (English)In: Smart Electric Distribution Systems and Technologies (EDST), 2015 International Symposium on, IEEE , 2015Conference paper, Published paper (Refereed)
Abstract [en]

Energy storage systems are a key element in the development of the smart grid. The complexity of the power grid necessitates energy storages to provide various services with each having distinct requirements. Each energy storage technology comes with its own unique characteristics, which makes it difficult to select suitable energy storages for specified applications. This paper reviews the suitability of using Fuzzy Logic as a selection method. The main objective of this study is to compare the results of the multi-criteria analysis with the present experience and literature of energy storage applications.

Place, publisher, year, edition, pages
IEEE, 2015
Keywords
Energy Storage, Fuzzy Logic, Multicriteria Evaluation Method, Smart Grid Application
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering; Planning and Decision Analysis
Identifiers
urn:nbn:se:kth:diva-173722 (URN)10.1109/SEDST.2015.7315251 (DOI)000380614000075 ()2-s2.0-84964430195 (Scopus ID)978-1-4799-7735-2 (ISBN)
External cooperation:
Conference
International Symposium on Smart Electric Distribution Systems and Technologies (EDST) CIGRE SC C6 Colloquium, Vienna, Austria - September 8-11, 2015
Funder
StandUp
Note

QC 20151116

Available from: 2015-09-17 Created: 2015-09-17 Last updated: 2018-12-11Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-3070-9059

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