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Tolerance Band Adaptation Method for Dynamic Operation of Grid-Connected Modular Multilevel Converters
KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik. ABB Corporate Research Vasteras, Sweden.ORCID-id: 0000-0001-8788-0415
KTH, Skolan för elektro- och systemteknik (EES), Elkraftteknik.ORCID-id: 0000-0002-8565-4753
2016 (engelsk)Inngår i: IEEE transactions on power electronics, ISSN 0885-8993, E-ISSN 1941-0107, nr 99, s. 1-1Artikkel i tidsskrift (Fagfellevurdert) Published
Resurstyp
Text
Abstract [en]

The use of modular multilevel converters (MMC) in high-voltage direct current (HVDC) transmission systems has grown significantly in the past decade. The efficiency, cell capacitor voltage ripple and dynamic performance are three contradictory aspects of the MMC which are related to the converter switching scheme. Previously introduced tolerance band-based schemes enable efficient and simple control for grid-connected MMCs. This paper addresses the dynamic operation of tolerance band switching schemes by proposing a dynamic boundary setting technique for steady-state operation and a switching scheme scheduling controller for transient fault handling. The performance of proposed methods are validated in a realistic point-to-point HVDC link, modeled in real-time digital simulator (RTDS) where two converters with 512 cells per arm are implemented. Utilizing the proposed methods will enable efficient implementation of tolerance band-based schemes for different operating points, and also a robust transient fault handling.

sted, utgiver, år, opplag, sider
IEEE , 2016. nr 99, s. 1-1
Emneord [en]
Capacitors, Converters, HVDC transmission, Harmonic analysis, Integrated circuits, Steady-state, Switche, HVDC transmission, Power conversion, Switching frequency, Switching loss
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-182748DOI: 10.1109/TPEL.2016.2521480ISI: 000380116600020Scopus ID: 2-s2.0-84978646167OAI: oai:DiVA.org:kth-182748DiVA, id: diva2:905651
Forskningsfinansiär
StandUp
Merknad

QC 20160311

Tilgjengelig fra: 2016-02-23 Laget: 2016-02-23 Sist oppdatert: 2017-11-30bibliografisk kontrollert
Inngår i avhandling
1. Modulation of Modular Multilevel Converters for HVDC Transmission
Åpne denne publikasjonen i ny fane eller vindu >>Modulation of Modular Multilevel Converters for HVDC Transmission
2016 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The outstanding features of modular multilevel converters (MMC) have recently gained much attention in the high-voltage direct-current (HVDC) transmission field. Power quality, converter cost and system performance are three crucial aspects of HVDC MMCs which are directly linked to the converter modulation and switching schemes. High power quality and performance require high switching frequency and large cell capacitor whereas low switching frequency and small cell capacitor are needed to reduce the converter cost.

The main objective of this thesis is to propose a practical switching method for HVDC MMCs which balances the aforementioned contradictory requirements. A mathematical analysis of the converter switching pattern, against the power quality and converter cost, has been conducted to formulate an optimization problem for MMCs. Different objective functions are studied for the formulated optimization problem such as converter loss minimization, voltage imbalance minimization and computational burden minimization. This thesis proposes three methods to address different objective functions. Ultimately, a real-time simulator has been built to practically verify and investigate the performance of the proposed methods in a realistic point-to-point HVDC link.

The most significant outcome of this thesis is the tolerance band-based switching scheme which offers a direct control of the cell capacitor voltage, low power losses, and robust dynamic performance. As a result, the converter switching frequency can reach frequencies as low as 70 Hz (with the proposed cell tolerance band (CTB) method). A modified optimized CTB method is proposed to minimize the converter switching losses and it could reduce the converter switching losses by 60% in comparison to the conventional phase shifted carrier modulation method.

It is concluded intelligent utilization of sorting algorithm can enable efficient HVDC station operation by reducing the converter cost.

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2016. s. 57
Serie
TRITA-EE, ISSN 1653-5146 ; 2016:139
Emneord
HVDC, switching schemes, modulation, high power converters, power grids
HSV kategori
Forskningsprogram
Elektro- och systemteknik
Identifikatorer
urn:nbn:se:kth:diva-192607 (URN)978-91-7729-098-8 (ISBN)
Disputas
2016-10-07, Sal D3, Kungl Tekniska Högskolan, Lindstedtsvägen 5, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

QC 20160916

Tilgjengelig fra: 2016-09-16 Laget: 2016-09-15 Sist oppdatert: 2019-08-21bibliografisk kontrollert

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