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Techno-economic analysis with energy flow modeling for investigating the investment risks related to consumption changes within a standalone microgrid in Sweden
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0003-1894-6980
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-4004-0352
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0003-4074-9529
2021 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 225, article id 120156Article in journal (Refereed) Published
Abstract [en]

A techno-economic energy flow model for a standalone microgrid was developed to investigate the investment risks related to consumption changes and compare the results to a conventional grid-connection in Sweden. Two different design strategies for a standalone microgrid was used, one with the objective to minimize the life-cycle cost and the other to provide a lower investment risk. The largest contributor to an increased investment risk for both design strategies was an increase in annual energy consumption within the standalone microgrid. The design strategy with the objective to reduce the investment risk eliminated the influence on the life-cycle cost from an increase in peak consumption and reduced the overall investment risk in comparison to the design strategy with the objective to minimize the life-cycle cost. However, a larger life-cycle cost was the drawback of that design strategy. It was concluded that locations with larger annual mean capacity factors reduced the investment risk for standalone microgrids due to lower diesel fuel dependence. It was also concluded that a conventional grid-connection had a lower investment risk than a standalone microgrid, since adverse changes in consumption always increased the life-cycle cost less for a conventional grid-connection than for a standalone microgrid.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 225, article id 120156
Keywords [en]
Energy system modeling, Microgrids, Power system economics, Renewable energy, Rural electrification
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-83093DOI: 10.1016/j.energy.2021.120156ISI: 000647578500005Scopus ID: 2-s2.0-85102115823OAI: oai:DiVA.org:ltu-83093DiVA, id: diva2:1531651
Note

Validerad;2021;Nivå 2;2021-03-15 (johcin);

Finansiär: Skellefteå Kraft Elnät AB; Rönnbäret Foundation

Available from: 2021-02-26 Created: 2021-02-26 Last updated: 2023-09-05Bibliographically approved
In thesis
1. Power quality analysis and techno-economic modeling for microgrids
Open this publication in new window or tab >>Power quality analysis and techno-economic modeling for microgrids
2021 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The work done in this thesis considers microgrids from two different aspects. Power quality and techno-economics of microgrids. Detailed power quality measurements have been made at a single house hydrogen-solar microgrid that consists of state-of-the-art energy efficiency technology, energy production and energy storage. The microgrid can both connect to the grid and operate in islanded operation. The power quality is quantified from these measurements where several power quality parameters during islanded operation go beyond the limits set by standards such as EN 50160 and IEEE 519-2014. The effect on connected equipment from both frequency variations and voltage quality is also discussed. Four new performance indexes are presented in the thesis that are based on apparent impedances. The first with the name PHIPI quantifies how much the harmonic voltage magnitude changes with an increase in harmonic current magnitude on the same phase. The second with the name SHIPI quantifies how much the harmonic voltage magnitude changes with an increase in harmonic current magnitude on another phase. The third with the name AHSI uses the harmonic voltage and current magnitudes of all phases to create a single performance parameter expressed as an apparent impedance for the system. The fourth with the name ARMSSI quantifies the phase RMS voltage drop for a certain phase RMS current rise in terms of an apparent impedance. The thesis also shows techno-economic modeling with times series energy flow to study the investment risks related to consumption changes in a standalone microgrid. The results show that consumption changes are an important parameter when designing a standalone microgrid and that the risk can be mitigated with changes to the system design, but at a larger system cost. The projected cost reduction until the year 2050 for standalone hydrogen based microgrids and some risk aspects with hydrogen based microgrids are also discussed in the thesis. 

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2021
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Keywords
Power Quality, Economy, Microgrids
National Category
Energy Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-87616 (URN)978-91-7790-966-8 (ISBN)978-91-7790-967-5 (ISBN)
Public defence
2021-12-13, Hörsal A and online, Skellefteå, 10:00 (English)
Opponent
Supervisors
Available from: 2021-10-25 Created: 2021-10-25 Last updated: 2023-09-05Bibliographically approved

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Nömm, JakobRönnberg, Sarah K.Bollen, Math H.J.

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