WO2020032457A1 - Sous-module pour convertisseur mmc - Google Patents

Sous-module pour convertisseur mmc Download PDF

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Publication number
WO2020032457A1
WO2020032457A1 PCT/KR2019/009466 KR2019009466W WO2020032457A1 WO 2020032457 A1 WO2020032457 A1 WO 2020032457A1 KR 2019009466 W KR2019009466 W KR 2019009466W WO 2020032457 A1 WO2020032457 A1 WO 2020032457A1
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WO
WIPO (PCT)
Prior art keywords
controller
voltage
submodule
sub
charging
Prior art date
Application number
PCT/KR2019/009466
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English (en)
Korean (ko)
Inventor
박용희
유현호
정홍주
이주연
Original Assignee
효성중공업 주식회사
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.)
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Publication date
Application filed by 효성중공업 주식회사 filed Critical 효성중공업 주식회사
Publication of WO2020032457A1 publication Critical patent/WO2020032457A1/fr

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    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • 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
    • H02M7/493—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 the static converters being arranged for operation in parallel
    • 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 a submodule of a modular multilevel converter (MMC), and more particularly to a submodule of an MMC converter configured to stably supply power to a submodule controller for controlling a submodule for an MMC converter.
  • MMC modular multilevel converter
  • a Modular Multilevel Converter (MMC) converter may be linked to an HVDC system for power transmission and reactive power compensation.
  • the MMC converter includes a plurality of submodules connected in series.
  • the submodule is a very important factor and is controlled by the submodule controller provided inside the submodule.
  • the submodule is used as a power source of the submodule controller using the high voltage of the submodule.
  • a power supply device for converting the low voltage required for the submodule controller is required.
  • the submodule 10 includes a bridge circuit including a plurality of switches 11 and 12 and a capacitor 13.
  • the submodule 10 is controlled by an internal submodule controller 16.
  • the power supply of the submodule controller 16 uses the high voltage charged in the capacitor 13. That is, the high voltage of the submodule 10 is converted into the power of the submodule controller 16 by the DC-DC converter 15 to be supplied to the submodule controller 16.
  • the submodule controller 16 switches the switches 11 and 12.
  • the submodule 10 of the conventional MMC converter is required to supply the submodule controller 16 with a high voltage of several tens to several tens of volts stored in the submodule 10 to supply power to the submodule controller 16.
  • a DC-DC converter 15 that converts to a low voltage of several tens of volts is necessary.
  • an object of the present invention is to provide a submodule of an MMC converter capable of stably supplying a voltage required for the operation of the submodule controller without providing a DC-DC converter in the submodule applied to the MMC converter.
  • the present invention has an additional object to provide a sub-module of the MMC converter to prevent a failure due to the internal overvoltage of the sub-module in supplying power to the controller of the sub-module applied to the MMC converter.
  • Sub-module of the MMC converter according to an embodiment of the present invention, the charging unit for charging a voltage; A plurality of switching elements connected in parallel to the charging unit in a bridge form; And a sub module controller for controlling switching of the plurality of switching elements, wherein the sub module controller is connected to a main controller with a power line and receives a voltage from the main controller through the power line.
  • it further comprises one or more charging cells connected to the sub module controller, the voltage charged in the charging cell is supplied to the sub module controller.
  • the apparatus may further include at least one charging cell connected to the sub module controller and a switch for electrically connecting the charging cell and the sub module controller, wherein the sub module controller detects a voltage supplied from the main controller.
  • the sub-module controller further includes a voltage detector, and when the voltage detected by the voltage detector is less than a preset voltage, the sub-module controller turns on the switch to supply the charged voltage to the sub-module controller.
  • the sub-module of the MMC converter according to another embodiment of the present invention, the charging unit for charging a voltage; A plurality of switching elements connected in parallel to the charging unit in a bridge form; And a sub-module controller for controlling switching of the plurality of switching elements, wherein the sub-module controller is connected to a main controller by an optical fiber cable and uses a optical signal received from the main controller through the optical fiber cable to supply a voltage.
  • the sub-module controller the light receiving unit for receiving an optical signal received from the main controller; And a photoelectric conversion unit generating a voltage by converting the optical signal received from the light receiving unit into an electrical signal.
  • it further comprises one or more charging cells connected to the sub module controller, the voltage charged in the charging cell is supplied to the sub module controller.
  • the apparatus may further include at least one charging cell connected to the sub module controller, and a switch for electrically connecting the charging cell and the sub module controller, wherein the sub module controller detects a voltage supplied from the main controller.
  • the sub-module controller further includes a voltage detector, and when the voltage detected by the voltage detector is less than a preset voltage, the sub-module controller turns on the switch to supply the charged voltage to the sub-module controller.
  • a stable voltage can be supplied to the submodule controller even when the submodule of the MMC converter is not provided with a high specification DC-DC converter.
  • the submodule since the submodule does not have a DC-DC converter, cost can be reduced and there is no problem in the operation of the submodule controller even when an overvoltage occurs in the internal high voltage.
  • the present invention it is possible to operate the submodule controller without operating the submodule, so that the abnormal state of the submodule can be monitored in advance even when the submodule is not operated.
  • 1 is a configuration diagram of a sub module of a conventional MMC converter.
  • FIG. 2 is a configuration diagram of a sub module of an MMC converter according to an embodiment of the present invention.
  • 3 to 7 are diagrams illustrating the configuration of a sub module of an MMC converter, according to another exemplary embodiment.
  • first, second, A, B, (a), and (b) may be used. These terms are only to distinguish the components from other components, and the nature, order, order, etc. of the components are not limited by the terms. If a component is described as being “connected”, “coupled” or “connected” to another component, that component may be directly connected or connected to that other component, but there is another component between each component. It should be understood that may be “connected”, “coupled” or “connected”.
  • FIG. 2 is a configuration diagram of a sub module of an MMC converter according to an embodiment of the present invention.
  • the submodule 100 includes a plurality of switching devices 110 and 120, a charging unit 130, and a submodule controller 140.
  • the plurality of switching devices 110 and 120 may switch the input voltage input to the sub module 100 to charge the charging unit 130.
  • the plurality of switching elements 110 and 120 may be preferably composed of two to six power semiconductor switches, and are connected to the charging unit 130 in a bridge form to control the switching operation by the sub-module controller 140.
  • the figure shows a half bridge shape as an example, a full bridge shape is also possible.
  • the switching elements 110 and 120 may include, for example, an IGBT, a FET, a transistor, and the like, and the charging unit 130 may be a capacitor, for example, a device that stores a DC voltage.
  • the submodule controller 140 receives the power required for operation from the outside to control the switching of the plurality of switching elements 110 and 120. To this end, the submodule controller 140 receives power from an external main controller 150.
  • the submodule controller 140 may be selectively connected to the main controller 150, which is an upper controller, by a power line 160. Accordingly, the submodule controller 140 may perform power line communication with the main controller 150. The submodule controller 140 may communicate not only a voltage but also a control signal through the power line communication from the main controller 150.
  • the sub-module controller 140 can receive power without a DC-DC converter necessarily provided in the prior art.
  • FIG. 3 is a diagram illustrating a submodule configuration of an MMC converter according to another exemplary embodiment of the present invention.
  • FIG. 3 only a portion P of the submodule controller 140 is illustrated in FIG. 2 for convenience of description.
  • Other components of FIG. 2, that is, not illustrated in FIG. 3, that is, the configuration and operation of the plurality of switching elements 110 and 120 and the charging unit 130 are the same. This also applies to FIGS. 4 to 7.
  • one or more charging cells 170 may be connected to the submodule controller 140 in the submodule 100 according to another embodiment of the present invention.
  • the charging cell 170 provides a constant voltage to the submodule controller 140 when the voltage applied to the submodule controller 140 is smaller than a preset reference voltage.
  • the submodule controller 140 stores the voltage supplied from the main controller 150 in an energy storage unit (not shown).
  • the voltage stored in the energy storage unit must be at least a voltage required for the operation of the submodule controller 140.
  • the sub-module controller 140 cannot operate so that the voltage of the charging cell 170 is supplied to the energy storage unit to prevent this. This is to ensure that the voltage stored is always the required operating voltage.
  • the voltage charged in the charging cell 170 is supplied to the submodule controller 140 so as to supply the submodule controller 140.
  • the sub-module controller 140 may further include a voltage detector 180 and the charging cell 170 and the sub-module controller 140.
  • the switch 190 may be connected between.
  • the voltage detector 180 detects a voltage supplied from the main controller 150 to the submodule controller 140. Accordingly, when the voltage supplied from the main controller 150 is less than the voltage required for the submodule controller 140, the submodule controller 140 turns on the switch 190 connected to the charging cell 170 to the charging cell 170. The charged voltage is supplied to the submodule controller 140.
  • the voltage is continuously supplied from the charging cell 170 to the sub-module controller 140 in FIG. 3, but in FIG. 4, the supply voltage from the main controller 150 is smaller than the voltage required for operation. Only when the voltage of the charging cell 170 is to be supplied to the sub-module controller 140.
  • the submodule controller 140 may be selectively connected to the main controller 150 by an optical power cable 200.
  • an optical power cable may include an optical fiber cable.
  • the optical fiber cable serves to transmit the light emitted from the light source.
  • the main controller 150 may include a light source for optical power transmission, and the light generated from the light source is transmitted to the submodule controller 140 through the optical fiber cable 200.
  • the sub-module controller 140 may include a light receiving unit 210 for receiving such light and a photoelectric conversion unit 220 for converting the light into power using the received light.
  • the light receiver 210 may include a semiconductor light receiver such as a photodiode as a device for detecting light.
  • the photoelectric conversion unit 220 may convert an optical signal into an electrical signal and may include, for example, a photoconductive sensor, a phototransistor, a photoconductive image sensor, and the like.
  • the submodule controller 140 may generate a voltage necessary for the operation of the submodule controller 140 using the optical signal received from the main controller 150 through the optical fiber cable 200. This allows the submodule controller 140 according to the present invention to be supplied with power without the DC-DC converter provided in the prior art.
  • 6 and 7 are diagrams illustrating submodules of the MMC converter according to another exemplary embodiment of the present invention, respectively.
  • one or more charging cells 170 may be connected to the submodule controller 140 in the submodule 100 according to another exemplary embodiment.
  • the charging cell 170 may provide a constant voltage to the submodule controller 140 when the voltage generated by the photoelectric conversion unit 220 of the submodule controller 140 is smaller than the voltage required for the operation of the submodule controller 140. do.
  • the submodule controller 140 stores the voltage generated by the photoelectric conversion unit 220 in the energy storage unit (not shown). In order for the submodule controller 140 to operate, the voltage stored in the energy storage unit must be at least a voltage required for the operation of the submodule controller 140. However, if the voltage stored in the energy storage unit does not reach the operating voltage due to some cause, the sub-module controller 140 cannot operate so that the voltage of the charging cell 170 is supplied to the energy storage unit to prevent this. This is to ensure that the voltage stored is always a constant voltage required for operation.
  • the photoelectric conversion unit 220 charges the voltage generated from the optical signal even if it does not reach the operating voltage of the submodule controller 140.
  • the voltage charged in the cell 170 is supplied to the submodule controller 140 so that the submodule controller 140 maintains a constant voltage.
  • the sub-module controller 140 illustrated in FIG. 6 may further include a voltage detector 240 and may include a charging cell 170.
  • the switch 250 may be connected between the submodule controllers 140.
  • the voltage detector 240 detects a voltage generated by the photoelectric converter 220. Accordingly, when the voltage detected by the voltage detector 240 is smaller than the voltage required for the operation of the submodule controller 140, the submodule controller 140 turns on the switch 250 connected to the charging cell 170 to charge the battery 170. ) Is supplied to the sub-module controller 140.
  • the voltage is continuously supplied from the charging cell 170 to the sub-module controller 140 in FIG. 6, but in FIG. 7, the voltage generated by the photoelectric conversion unit 240 is required for operation. Only when smaller, the voltage of the charging cell 170 is supplied to the submodule controller 140.
  • the submodule 100 of the MMC converter according to the present invention may supply a voltage required for the operation of the internal submodule controller 140 by using a voltage or an optical signal supplied from the main controller 150. Therefore, it is not necessary to provide a high-end DC-DC converter for the power supply of the submodule controller 140 as in the prior art. As a result, even when the voltage is not supplied to the submodule 100, the voltage can be applied to the submodule controller 140 so that the submodule 100 can be monitored even before the submodule 100 is operated. Even if an overvoltage occurs, it is irrelevant to the operation of the submodule controller 140.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

La présente invention concerne un sous-module pour un convertisseur MMC configuré pour alimenter de façon stable un dispositif de commande de sous-module pour commander le sous-module pour le convertisseur MMC. Un sous-module pour un convertisseur MMC selon un mode de réalisation de la présente invention comprend : une unité de charge pour charger une tension ; une pluralité d'éléments de commutation connectés en parallèle sous forme de pont à l'unité de charge ; et un dispositif de commande de sous-module pour commander la commutation de la pluralité d'éléments de commutation, le dispositif de commande de sous-module étant connecté à un dispositif de commande principal par une ligne d'alimentation et recevant une tension depuis le dispositif de commande principal par l'intermédiaire de la ligne d'alimentation.
PCT/KR2019/009466 2018-08-07 2019-07-30 Sous-module pour convertisseur mmc WO2020032457A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020180091536A KR20200016431A (ko) 2018-08-07 2018-08-07 Ｍｍｃ 컨버터의 서브모듈
KR10-2018-0091536 2018-08-07

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WO2020032457A1 true WO2020032457A1 (fr) 2020-02-13

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WO (1) WO2020032457A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111478289A (zh) * 2020-04-14 2020-07-31 国家电网有限公司 一种换流阀过电压保护方法及系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050226625A1 (en) * 2004-04-09 2005-10-13 Microwave Photonics, Inc. Optical fiber communications method and system without a remote electrical power supply
JP2011024393A (ja) * 2009-07-21 2011-02-03 Hitachi Ltd 電力変換装置
JP2013255422A (ja) * 2010-03-15 2013-12-19 Hitachi Ltd 電力変換装置
KR101630510B1 (ko) * 2014-05-13 2016-06-14 엘에스산전 주식회사 모듈형 멀티레벨 컨버터
KR101758301B1 (ko) * 2016-12-21 2017-07-14 윤광희 모듈러 멀티레벨 컨버터의 제어기 전원 공급 장치 및 방법

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101725087B1 (ko) 2014-12-29 2017-04-26 주식회사 효성 Ｍｍｃ 컨버터의 서브모듈용 전원제어장치
KR101711948B1 (ko) 2014-12-29 2017-03-03 주식회사 효성 Ｍｍｃ 컨버터의 서브모듈용 전원제어장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050226625A1 (en) * 2004-04-09 2005-10-13 Microwave Photonics, Inc. Optical fiber communications method and system without a remote electrical power supply
JP2011024393A (ja) * 2009-07-21 2011-02-03 Hitachi Ltd 電力変換装置
JP2013255422A (ja) * 2010-03-15 2013-12-19 Hitachi Ltd 電力変換装置
KR101630510B1 (ko) * 2014-05-13 2016-06-14 엘에스산전 주식회사 모듈형 멀티레벨 컨버터
KR101758301B1 (ko) * 2016-12-21 2017-07-14 윤광희 모듈러 멀티레벨 컨버터의 제어기 전원 공급 장치 및 방법

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111478289A (zh) * 2020-04-14 2020-07-31 国家电网有限公司 一种换流阀过电压保护方法及系统
CN111478289B (zh) * 2020-04-14 2022-07-05 国家电网有限公司 一种换流阀过电压保护方法及系统

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