GB2590211A - Improved modular multilevel converter - Google Patents

Improved modular multilevel converter Download PDF

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Publication number
GB2590211A
GB2590211A GB2100235.7A GB202100235A GB2590211A GB 2590211 A GB2590211 A GB 2590211A GB 202100235 A GB202100235 A GB 202100235A GB 2590211 A GB2590211 A GB 2590211A
Authority
GB
United Kingdom
Prior art keywords
waveshaper
branch
point
connection point
string
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB2100235.7A
Other versions
GB202100235D0 (en
GB2590211B (en
Inventor
Okazaki Yuhei
ILVES Kalle
Bakas Panangiotis
Shulka Anshuman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Energy Switzerland AG
Original Assignee
ABB Power Grids Switzerland AG
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 Power Grids Switzerland AG filed Critical ABB Power Grids Switzerland AG
Publication of GB202100235D0 publication Critical patent/GB202100235D0/en
Publication of GB2590211A publication Critical patent/GB2590211A/en
Application granted granted Critical
Publication of GB2590211B publication Critical patent/GB2590211B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • H02M7/42—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
    • H02M7/49—Combination of the output voltage waveforms of a plurality of converters
    • 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
    • H02M7/497—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 sinusoidal output voltages being obtained by combination of several voltages being out of phase
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H02P27/14—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation with three or more levels of voltage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Ac-Ac Conversion (AREA)
  • Rectifiers (AREA)

Abstract

A voltage source converter comprises a number of converter modules, one for each phase of an AC waveshape to be generated, connected between two DC terminals and each comprising a first and a second DC connection point (DCCP1, DCCP2), a string of director switches (S1, S2), the midpoint of which provides a third connection point (CP3), and waveshaper branches (WSB1, WSB2) connected in parallel with each other as well as to the string, each waveshaper branch (WSB1, WSB2) comprising submodules (SMA1, SMA2, SMA3, SMA4, SMB1, SMB2, SMB3, SMB4) and being connected to an AC connection point (ACCP1, ACCP2) provided for the branch, wherein at least one of the AC connection point and the third connection point is provided for connection to a corresponding phase of an AC link, the first and second waveshaper branches produce two similar waveshapes for the AC link and the switches change the way the waveshapes are applied to connection points.

Claims (15)

1. A voltage source converter (10A; 10B) having a first and a second direct current, DC, terminal (DCi, DC2) for connection to a DC voltage and comprising: a number of converter modules (12, 14, 16), one for each phase of an alternating current, AC, waveshape to be generated, the converter modules being connected between the DC terminals and each comprising a first and a second DC connection point (DCCPi, DCCP2) for connection between the first and second DC terminals (DCi, DC2), a first string of director switches (Si, S2; Si, S2, Su, Sl) comprising at least two director switches (Si, S2), the midpoint of which string provides a third connection point (CP3), and a first and a second waveshaper branch (WSBi, WSB2) connected in parallel with each other as well as connected to the first string of director switches, each waveshaper branch (WSBi, WSB2) comprising a number of submodules (SMAi, SMA2, SMA3, SMA4, SMBi, SMB2, SMB3, SMB4) and being connected to an AC connection point (ACCPi; ACCPi, ACCP2) provided for the branch, wherein at least one of the AC connection point and the third connection point is a connection point for connection to a corresponding phase of an AC link, the first and second waveshaper branches are controllable to produce two similar waveshapes for the AC link and the director switches are controllable to change the way the waveshapes are applied to some of the connection points.
2. The voltage source converter (10A; 10B) according to claim 1, wherein for each waveshaper branch (WSBi, WSB2) there is at least one first inductor (LiA, LiB; Li) connected between the associated AC connection point and a first point (SPi) of the first string leading to the first DC connection point (DCCPi) and at least one second inductor (L2A, L2B; L2) connected between the associated AC connection point and a second point (SP2) of the first string leading to the second DC connection point (DCCP2).
3. The voltage source converter (10A; 10B) according to claim 2, wherein each waveshaper branch comprises a first and second end, where at least one end of each waveshaper branch (WSBi, WSB2) is connected to the corresponding point of the first string via the corresponding at least one inductor.
4. The voltage source converter (10A; 10B) according to claim 3, wherein the first end of the first waveshaper branch (WSBi) is connected to the first point of the string via a separate inductor (LiA), the first end of the second waveshaper branch (WSB2) is connected to the first point of the string via a separate inductor (LiB), the second end of the first waveshaper branch (WSB2) is connected to the second point of the string via a separate inductor (L2A) and the second end of the second waveshaper branch (WSB2) is connected to the second point of the phase arm via a separate inductor (L2B).
5. The voltage source converter (10A; 10B) according to claim 2 or 3, wherein the at least one first inductor is a first common inductor (Li) connected between the waveshaper branches (WSBi, WSB2) and having a midpoint with a connection leading to the first point (SPi) of the first string and the at least one second inductor is a second common inductor (L2) connected between the waveshaper branches (WSBi, WSB2) and having a midpoint with a connection leading to the second point (SP2) of the first string.
6. The voltage source converter (10A; 10B) according to any previous claim, wherein the first and second waveshaper branches (WSBi, WSB2) are connected in parallel with the first and second switches (Si, S2).
7. The voltage source converter (10A; 10B) according to any previous claim, wherein each waveshaper branch (WSBi, WSB2) comprises an upper waveshaper arm (uaa, uab) comprising submodules, a lower waveshaper arm (laa, lab) comprising submodules and an intermediate arm (iaa, iab) between the lower and upper waveshaper arms, the intermediate arm being connected in parallel with a second string of switches (S3, S4), wherein the AC connection point (ACCPi) associated with a waveshaper branch is provided at a midpoint of the second string of switches.
8. The voltage source converter (10A; 10B) according to claim 7, wherein the intermediate arms (iaa, iab) comprise submodules (SMAIi, SMAI2, SMBIi, SMBI2).
9. The voltage source converter (10A; 10B) according to claim 7, wherein each intermediate arm comprises a capacitor (CCA, CCB) in series with a bypass switch (BPSWA, BPSWB).
10. The voltage source converter (10A; 10B) according to any previous claim, wherein a first AC connection point (ACCPi) is provided for the first waveshaper branch and a second AC connection point (ACCP2) is provided for the second waveshaper branch.
11. The voltage source converter (10A; 10B) according to claim 10, wherein the first and second AC connection points (ACCP11, ACCP2) of the first and second waveshaper branches are interconnected.
12. The voltage source converter (10A; 10B) according to claim 10, wherein the first AC connection point (ACCPi) of the first waveshaper branch (WSBi) is connected to a secondary winding of a first transformer (TRi; TRAi) and the second AC connection point (ACCP2) of the second waveshaper branch (WSB2) is connected to a secondary winding of a second transformer (TR2; TRA2), where the primary windings of these two transformers are connected in parallel to the corresponding phase of the AC link.
13. The voltage source converter (10A; 10B) according to any previous claim, wherein the first point (SPi) of the first string is placed at a junction between the first switch (Si) and the first DC connection point (DCCPi) and the second point (SP2) of the first string is placed at a junction between the second switch (S2) and the second DC connection point (DCCP2).
14. The voltage source converter (10 A) according to any previous claim, wherein the converter modules (12, 14, 16) are connected in series between the DC terminals (DCi, DC2) using the first and second DC connection points (DCCPi, DCCP2).
15. The voltage source converter (10B) according to any of claims 1 - 13, wherein the converter modules (12, 14, 16) are connected in parallel between the DC terminals (DCi, DC2) using the first and second DC connection points (DCCPi, DCCP2).
GB2100235.7A 2018-07-06 2019-04-24 Improved modular multilevel converter Active GB2590211B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1850857A SE542175C2 (en) 2018-07-06 2018-07-06 Improved modular multilevel converter
PCT/EP2019/060495 WO2020007516A1 (en) 2018-07-06 2019-04-24 Improved modular multilevel converter

Publications (3)

Publication Number Publication Date
GB202100235D0 GB202100235D0 (en) 2021-02-24
GB2590211A true GB2590211A (en) 2021-06-23
GB2590211B GB2590211B (en) 2022-08-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB2100235.7A Active GB2590211B (en) 2018-07-06 2019-04-24 Improved modular multilevel converter

Country Status (3)

Country Link
GB (1) GB2590211B (en)
SE (1) SE542175C2 (en)
WO (1) WO2020007516A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130258726A1 (en) * 2010-10-15 2013-10-03 Abb Technology Ag Arrangement for transmitting power between a dc power line and an ac power line
WO2014082661A1 (en) * 2012-11-27 2014-06-05 Abb Technology Ltd Phase converter with transformer coupled cells, hv ac/dc converter and associated method
US20140355321A1 (en) * 2011-11-25 2014-12-04 Tokyo Institute Of Technology Single-phase power converter, three-phase two-phase power converter, and three-phase power converter
CN105515422A (en) * 2016-01-12 2016-04-20 上海交通大学 Multiple-branching modularized multilevel converter (MMC) applicable to ultralow modulation ratio application
US20170005590A1 (en) * 2014-02-03 2017-01-05 Kabushiki Kaisha Toshiba Power converter
WO2017021169A1 (en) * 2015-07-31 2017-02-09 Abb Schweiz Ag Hybrid modular multi-level converter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9559611B2 (en) 2012-09-28 2017-01-31 General Electric Company Multilevel power converter system and method
EP2999105A1 (en) 2014-09-17 2016-03-23 Alstom Technology Ltd Hybrid modular multicell converter with bidirectional thyristor switches
WO2016177398A1 (en) 2015-05-05 2016-11-10 Abb Technology Ltd Voltage source converter with improved operation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130258726A1 (en) * 2010-10-15 2013-10-03 Abb Technology Ag Arrangement for transmitting power between a dc power line and an ac power line
US20140355321A1 (en) * 2011-11-25 2014-12-04 Tokyo Institute Of Technology Single-phase power converter, three-phase two-phase power converter, and three-phase power converter
WO2014082661A1 (en) * 2012-11-27 2014-06-05 Abb Technology Ltd Phase converter with transformer coupled cells, hv ac/dc converter and associated method
US20170005590A1 (en) * 2014-02-03 2017-01-05 Kabushiki Kaisha Toshiba Power converter
WO2017021169A1 (en) * 2015-07-31 2017-02-09 Abb Schweiz Ag Hybrid modular multi-level converter
CN105515422A (en) * 2016-01-12 2016-04-20 上海交通大学 Multiple-branching modularized multilevel converter (MMC) applicable to ultralow modulation ratio application

Also Published As

Publication number Publication date
WO2020007516A1 (en) 2020-01-09
GB202100235D0 (en) 2021-02-24
SE1850857A1 (en) 2020-01-07
GB2590211B (en) 2022-08-03
SE542175C2 (en) 2020-03-10

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