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Modelling aggregate loads in power systems
KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The load response to voltage and frequency changeshas a considerable impact on the behaviour of the powersystem. Thus, the selection of a load model structure andits corresponding parameters is an important task in orderto study and predict the system behaviour. Currently,the Nordic Transmission System Operators (TSO) use theZIP load model, as it provides an easy and flexible way ofrepresenting the load. The main goal of the thesis has beento test two approaches for deriving ZIP model parameters,namely the component-based and measurement-basedapproaches. The former approach uses predefined parametervalues, and information on the loads electricityconsumption, whereas the latter uses measurement dataand curve-fitting techniques. In order to evaluate themethodology, a case study has been performed, wherethe two aggregation approaches were applied on anevaluation point. It was found that the aggregation bymeans of the component-based approach may result in ZIPparameters lacking physical significance. ZIP parameterswithout physical significance pose a challenge for systemplanners, who may have difficulties in accepting thesevalues as they are less intuitive than physically significantones. Furthermore, the results of the measurement-basedapproach indicate that the ZIP model has some limitationwhen it comes to the sudden load changes that it canaccommodate. This has been the case with the measuredreactive power in the case study. Based on the resultsof applying the methodology, it can be concluded thatthe component-based and measurement-based approachesprovide useful information when understanding powersystem loads.

Abstract [sv]

Lastens svar på spänning och frekvensförändringarhar en betydande inverkan på elkraftsystemet. Sålundaär valet av en lastmodell och dess parametrar viktigt föratt kunna studera och förutsäga systemets beteende. Förnärvarande använder de nordiska stamnätsägarna (TSO)ZIP lastmodellen, eftersom det ger ett enkelt och flexibeltsätt att representera lasten. Huvudsyftet med den häravhandlingen har varit att testa två metoder för att ta framZIP modellparametrar, nämligen en komponent-baseradoch en mätnings-baserade metod. Den tidigare metodenanvänder fördefinierade parametervärden, och informationom lasternas elförbrukning, medan den senare användermätdata och kurvanpassningstekniker. För att utvärderametoden har en fallstudie genomförts där de två metodernaapplicerades på en utvärderingspunkt. Det konstateradesatt den komponent-baserade metoden kan resultera i ZIPparametrar som saknar fysisk betydelse. ZIP parametrarutan fysisk betydelse utgör en utmaning för systemplanerare,som kan ha svårt att acceptera dessa värden eftersom deär mindre intuitiva än fysiskt betydande sådana. Dessutomindikeras det, att ZIP modellen har begränsningar när detgäller att representera stora steg i den uppmätta effektenssvar, då den mätnings-baserade metoden används. Dettaär fallet för den reaktiva effekten i fallstudien. Baserat påresultaten av tillämpningen av metoden, kan man dra slutsatsenatt den komponent-baserade och mätnings-baserademetoden ge användbar information när man vill förståkraftsystems laster.

Place, publisher, year, edition, pages
2017. , p. 108
Series
TRITA-EE, ISSN 1653-5146 ; 2017:025
Keywords [en]
Load modelling, load aggregation, component-based load modelling, measurementbased load modelling, ZIP load model
Keywords [sv]
Lastmodellering, last aggregering, komponent-baserad metod, mätnings-baserad metod, ZIP last model
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-204600OAI: oai:DiVA.org:kth-204600DiVA, id: diva2:1085518
External cooperation
STRI AB
Educational program
Master of Science in Engineering - Electrical Engineering; Master of Science - Electric Power Engineering
Available from: 2017-03-29 Created: 2017-03-29 Last updated: 2017-03-29Bibliographically approved

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