WO2013044940A1 - Borne vsc-hvdc sans transformateur complet et doté d'un condensateur monté en série - Google Patents

Borne vsc-hvdc sans transformateur complet et doté d'un condensateur monté en série Download PDF

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Publication number
WO2013044940A1
WO2013044940A1 PCT/EP2011/066764 EP2011066764W WO2013044940A1 WO 2013044940 A1 WO2013044940 A1 WO 2013044940A1 EP 2011066764 W EP2011066764 W EP 2011066764W WO 2013044940 A1 WO2013044940 A1 WO 2013044940A1
Authority
WO
WIPO (PCT)
Prior art keywords
vsc
circuit arrangement
capacitor
multilevel
transformer
Prior art date
Application number
PCT/EP2011/066764
Other languages
English (en)
Inventor
Lars-Erik Juhlin
Lennart Harnefors
Chandra Mohan SONNATHI
Original Assignee
Abb Research Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Abb Research Ltd filed Critical Abb Research Ltd
Priority to PCT/EP2011/066764 priority Critical patent/WO2013044940A1/fr
Publication of WO2013044940A1 publication Critical patent/WO2013044940A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/05—Capacitor coupled rectifiers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Definitions

  • the present invention relates to the technical field of power conversion.
  • it concerns a multilevel Voltage Source Converter for conversion between direct voltage and alternating voltage.
  • High voltage direct current (HVDC) transmission lines are advantageously used for transmission of power over long distances.
  • AC alternating current
  • the transmission losses are dependent on both active and reactive power transfers.
  • the losses due to the reactive power transfer, for long transmission lines, will be substantial.
  • only active power is transferred.
  • the losses in an HVDC transmission line will therefore be lower than the losses in an AC transmission line of the same length.
  • a disadvantage of direct current (DC) transmission compared to AC transmission is that the interruption of a fault current is more difficult.
  • a fault current in an AC system inherently exhibits frequent zero crossings, which facilitate for fast current interruption. In a DC system, no inherent zero crossings occur. In order to break a DC current, a zero crossing of the DC current generally has to be forced upon the system.
  • a converter for converting alternating voltage into direct voltage and vice versa in a converter station of a high voltage transmission system may be a line-commutated Current Source Converter (CSC) in which switching elements, such as thyristors, are turned off at zero crossing of the AC current in an AC-system connected to the converter.
  • the converter may also be a forced commutated Voltage Source Converter (VSC), in which the switching elements are turn-off devices controlled according to a Pulse Width Modulation (PWM) pattern.
  • Voltage Source Converters are power switches comprising a plurality of semiconductor chips such as e.g. insulated gate bipolar transistor (IGBT) power modules.
  • Each converter valve has a number of power semiconductor devices connected in series for being able to together withstand the high voltage to be withstood by such a converter valve in the blocking state thereof.
  • a multilevel converter which is using a cascade configuration is based on serially connected cells to each alternating current (AC) phase, wherein the cells comprise semiconductor switches.
  • the switches can either insert or bypass the capacitor of the cell, thereby allowing the output voltage to be varied
  • Three-phase Voltage Source Converter HVDC terminals are normally equipped with a full transformer.
  • the transformer accounts for a significant amount of the total terminal costs and losses. It is a bulky unit, which in some cases presents a logistic problem. There is much to be gained from removing the transformer. This is not trivial, though, as the transformer integrates many desirable features.
  • One important aspect is the leakage inductance, providing surge current limitation.
  • the invention is based on the insight that the main function of a full transformer in HVDC applications using Voltage Source Converters is to adapt a voltage between the alternating voltage network and the converter and that it is not an integral part of the converter as in line commuted HVDC transmissions. Since the converter voltages are increasing, there is no great purpose of using a transformer for adapting voltages between an alternating voltage network and a direct voltage network as these voltages are fairly similar. However, removing the full transformer will provide disadvantageous steady state qualities and high fault currents. Therefore, a circuit arrangement is connected to each of the phase legs of a multilevel VSC, wherein the circuit
  • the arrangement is adapted to limit fault currents without impacting the steady state properties.
  • the alternating current network can thereby be connected to the phase output of each phase leg without any full transformer.
  • a multilevel VSC is provided as defined in claim 1.
  • a multilevel VSC includes at least one converter arm per phase leg.
  • the multilevel VSC has a phase output for direct connection to an AC network via a circuit arrangement, wherein the circuit arrangement is connected in series between the phase output of each of the phase legs and the corresponding phase output of the AC network.
  • the circuit arrangement includes at least one capacitor connected in parallel with at least one arrester. By combining the at least one capacitor with the at least one arrester the fault current can be limited and lower impedance in normal cases and higher impedance in cases of faults is provided. The present solution thereby enables the VSC to function without using a full transformer.
  • the circuit arrangement further includes a series connection of the at least one capacitor and at least one reactor.
  • the circuit arrangement includes a parallel connection of the at least one capacitor and at least one closing device.
  • the at least one closing device is adapted to short-circuit the at least one capacitor during a fault condition.
  • the primary advantage with the present solution is saved costs as the costs for said circuit arrangement is considerable lower than for a transformer.
  • At least one capacitor in a circuit arrangement can be very advantageous, if the capacitor is chosen correctly. It will give lower impedance in normal cases and higher impedance in cases of faults. Low impedance results in reduced losses in normal cases. High impedance limits the current, which is desirable in cases of faults.
  • Figure 1 schematically illustrates a phase leg of a VSC according to the prior art.
  • Figure 2 shows a schematic illustration of a phase leg of a multilevel VSC according to an embodiment of the invention.
  • FIG. 1 shows a schematic illustration of a phase leg of a VSC (10) according to the prior art.
  • a control device (1 1 ) is adapted to control the switching cells by controlling the semiconductor devices thereof.
  • Figure 1 also shows that a transformer (12) is
  • the multilevel VSC (20) includes at least one converter arm per phase leg and has a phase output (21 ) for direct connection to an AC network via a circuit arrangement (22), wherein the circuit arrangement (22) is connected in series between the phase output of each of the phase legs and the corresponding phase output (21 ) of the AC network.
  • the circuit arrangement includes at least one capacitor (23) connected in parallel with at least one arrester (24).
  • one of the reasons of using a transformer is its ability to isolate so that a DC component will not reach the AC network. Therefore, one of the main functions of the at least one capacitor (23) is to physically isolate to prevent a DC component from reaching the AC network.
  • the at least one capacitor (23) is chosen in such a way that the total impedance is reduced.
  • the at least one arrester (24) steps in which will lead to increased impedance.
  • the voltage of the at least one capacitor (23) will rise to the protective level of the at least one arrester (24) and the fault current will be limited by the inductance only.
  • the effect can be further increased by shortening the at least one capacitor (23) by at least one very fast closing device (25).
  • the at least one closing device (25) is adapted to short-circuit the at least one capacitor (23) during a fault condition.

Abstract

La présente invention a trait à un convertisseur de source de tension à plusieurs niveaux (VSC), qui est doté d'une sortie de phase permettant une connexion directe à un réseau à courant alternatif par l'intermédiaire d'un montage de circuits, lequel montage de circuits inclut au moins un condensateur et au moins un limiteur de surtension qui sont connectés en parallèle. Le montage de circuits est conçu de manière à limiter les courants de défaut. Le réseau à courant alternatif peut par conséquent être connecté aux sorties de phase de chaque branche de phase sans aucun transformateur complet.
PCT/EP2011/066764 2011-09-27 2011-09-27 Borne vsc-hvdc sans transformateur complet et doté d'un condensateur monté en série WO2013044940A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/066764 WO2013044940A1 (fr) 2011-09-27 2011-09-27 Borne vsc-hvdc sans transformateur complet et doté d'un condensateur monté en série

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/066764 WO2013044940A1 (fr) 2011-09-27 2011-09-27 Borne vsc-hvdc sans transformateur complet et doté d'un condensateur monté en série

Publications (1)

Publication Number Publication Date
WO2013044940A1 true WO2013044940A1 (fr) 2013-04-04

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105656322A (zh) * 2015-01-20 2016-06-08 华北电力大学 一种带有辅助换相电路的改进lcc-hvdc拓扑
US10069430B2 (en) 2013-11-07 2018-09-04 Regents Of The University Of Minnesota Modular converter with multilevel submodules
CN108847680A (zh) * 2018-07-26 2018-11-20 国网辽宁省电力有限公司经济技术研究院 一种基于柔性环网装置的交直流混合配电网分层控制方法
CN108988402A (zh) * 2018-07-26 2018-12-11 国网辽宁省电力有限公司经济技术研究院 基于优化调度的交直流配电网优化控制方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5414612A (en) * 1993-08-03 1995-05-09 Asea Brown Boveri Ab HVDC transmission with a converter connected between an AC voltage and a DC link common to the converters
WO2009149755A1 (fr) * 2008-06-12 2009-12-17 Abb Technology Ag Appareil de transmission d’énergie électrique
WO2011107151A1 (fr) * 2010-03-04 2011-09-09 Abb Research Ltd Station de conversion ca/cc et procédé d'actionnement de station de conversion ca/cc

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5414612A (en) * 1993-08-03 1995-05-09 Asea Brown Boveri Ab HVDC transmission with a converter connected between an AC voltage and a DC link common to the converters
WO2009149755A1 (fr) * 2008-06-12 2009-12-17 Abb Technology Ag Appareil de transmission d’énergie électrique
WO2011107151A1 (fr) * 2010-03-04 2011-09-09 Abb Research Ltd Station de conversion ca/cc et procédé d'actionnement de station de conversion ca/cc

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ALLEBROD S ET AL: "New transformerless, scalable Modular Multilevel Converters for HVDC-transmission", POWER ELECTRONICS SPECIALISTS CONFERENCE, 2008. PESC 2008. IEEE, IEEE, PISCATAWAY, NJ, USA, 15 June 2008 (2008-06-15), pages 174 - 179, XP031299971, ISBN: 978-1-4244-1667-7 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10069430B2 (en) 2013-11-07 2018-09-04 Regents Of The University Of Minnesota Modular converter with multilevel submodules
CN105656322A (zh) * 2015-01-20 2016-06-08 华北电力大学 一种带有辅助换相电路的改进lcc-hvdc拓扑
CN105656322B (zh) * 2015-01-20 2018-08-17 华北电力大学 一种带有辅助换相电路的lcc-hvdc拓扑
CN108847680A (zh) * 2018-07-26 2018-11-20 国网辽宁省电力有限公司经济技术研究院 一种基于柔性环网装置的交直流混合配电网分层控制方法
CN108988402A (zh) * 2018-07-26 2018-12-11 国网辽宁省电力有限公司经济技术研究院 基于优化调度的交直流配电网优化控制方法
CN108847680B (zh) * 2018-07-26 2021-06-11 国网辽宁省电力有限公司经济技术研究院 一种基于柔性环网装置的交直流混合配电网分层控制方法
CN108988402B (zh) * 2018-07-26 2022-05-17 国网辽宁省电力有限公司经济技术研究院 基于优化调度的交直流配电网优化控制方法

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