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Nested Microgrids: Operation and Control Requirement
KTH, School of Electrical Engineering (EES).
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Nested Microgrids refers to the interconnection of multiple microgrids into one network. Theyare connected through the Nested Microgrid Network which forms the electrical link betweenthem and facilitates power exchange.In this thesis the concept of Nested Microgrids is investigated. This resulted in theconceptualization of three different implementation methods. Inter-microgrid interaction in termsof controllers and required communication is also analyzed. The functions would differ from anormal microgrid and they are discussed thoroughly in this report. Real life projects are alsopresented.The efficacy and implementation of the proposed control functions are verified with time-domainsimulations. Four microgrid control functions, islanding, resynchronization, feeder load shed ongenerator overload and black start are investigated in Nested Microgrid scenarios. Differentcontrol strategies and exchange of information among the microgrid controllers are proposed forstable Nested Microgrids operation. This project provides the ground work for future work toexpand upon the theory provided and apply it into practical scenarios.

Abstract [sv]

Nested Microgrids (nästlade mikronät) hänvisar till sammankoppling av flera mikronät i ettnätverk. De är anslutna via ett Nested Microgrid Network som bildar den elektriska kopplingenmellan dem och underlättar effektutbytet.I denna avhandling undersöks begreppet Nested Microgrids. Detta har resulterat ikonceptualisering av tre olika integreringsmetoder. Interaktion mellan mikronät i form avstyrenheter samt nödvändig datakommunikation analyseras också. Kontrollfunktionerna kommeratt skilja sig från ett normalt mikronät, och dessa diskuteras grundligt i denna rapport. Verkligaprojekt presenteras också.Funktionaliteten och implementeringen av de föreslagna styrfunktionerna verifieras medtidsdomänsimuleringar. Fyra styrfunktioner för mikronät undersöks i scenarier med NestedMicrogrids; Islanding, Resynchronization, Feeder Load Shed on Generator Overload och BlackStart. Olika kontrollstrategier och utbyte av information mellan mikronätens styrenheter föreslåsför stabil kapslade microgrids drift. Projektet ligger till grund för det framtida arbetet att utökateorin och tillämpa den i praktiska situationer.

Place, publisher, year, edition, pages
2016.
Series
TRITA-EE, ISSN 1653-5146 ; 2016:163
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-201088OAI: oai:DiVA.org:kth-201088DiVA: diva2:1072529
Available from: 2017-02-08 Created: 2017-02-08 Last updated: 2017-02-08Bibliographically approved

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