WO2024098381A1 - Système de transmission de puissance à courant alternatif - Google Patents

Système de transmission de puissance à courant alternatif Download PDF

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Publication number
WO2024098381A1
WO2024098381A1 PCT/CN2022/131388 CN2022131388W WO2024098381A1 WO 2024098381 A1 WO2024098381 A1 WO 2024098381A1 CN 2022131388 W CN2022131388 W CN 2022131388W WO 2024098381 A1 WO2024098381 A1 WO 2024098381A1
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WO
WIPO (PCT)
Prior art keywords
transformer
converter
groups
winding
converter valve
Prior art date
Application number
PCT/CN2022/131388
Other languages
English (en)
Chinese (zh)
Inventor
赵国亮
邓占锋
徐云飞
陆振纲
李卫国
乔光尧
周丁
Original Assignee
国网智能电网研究院有限公司
国家电网有限公司
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 国网智能电网研究院有限公司, 国家电网有限公司 filed Critical 国网智能电网研究院有限公司
Priority to PCT/CN2022/131388 priority Critical patent/WO2024098381A1/fr
Publication of WO2024098381A1 publication Critical patent/WO2024098381A1/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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Definitions

  • the present disclosure relates to the field of power electronics technology, and in particular to an alternating current power transmission system.
  • the flexible low-frequency AC transmission system uses the frequency conversion and grid control technology of electronic power to flexibly select the appropriate frequency from 0 to 50HZ, enhance the flexible control capability of the grid, improve the transmission capacity of the grid, and make up for the shortcomings of industrial frequency AC and DC transmission methods.
  • the AC-AC converter in the flexible low-frequency AC transmission system generally adopts a modular multi-level matrix converter (hereinafter referred to as the converter), which can perform flexible control of the grid such as power flow control and voltage regulation while realizing frequency conversion, and is the core equipment of the AC transmission.
  • a series reactor is usually connected to each bridge arm of each converter to suppress the circulating current caused by energy imbalance between phases, and a transformer needs to be installed at both ends of the converter to improve the utilization rate of the IGBT switching device in the converter.
  • installing the series reactor and the transformer at the same time will increase the impedance of the system and reduce the transmission capacity of the system.
  • the technical problem to be solved by the present disclosure is to overcome the defect in the prior art that the simultaneous installation of a series reactor and a transformer will increase the impedance of the system and reduce the transmission capacity of the system, thereby providing an AC power transmission system.
  • the disclosed embodiment of the present invention discloses an AC power transmission system, including: a converter, wherein the converter includes: a plurality of converter valve groups, one end of each of the converter valve groups is connected to a first AC system, each bridge arm at the other end of each of the converter valve groups is connected in series with a side winding of a first transformer, and the other side winding of the first transformer is connected to a second AC system.
  • a second transformer is provided between the first AC system and the converter.
  • the first transformer comprises: a plurality of three-phase transformers, and the number of the three-phase transformers is the same as the number of the converter valve groups.
  • the first transformer includes: a plurality of single-phase transformer groups, the number of the single-phase transformer groups is the same as the number of the converter valve groups, each of the single-phase transformer groups includes: a plurality of single-phase transformers, the number of the single-phase transformers is the same as the number of bridge arms of each of the converter valve groups, and the other side windings of the plurality of single-phase transformers are connected in parallel and connected to the second AC system.
  • the first transformer includes: a plurality of single-phase transformer groups, the number of the single-phase transformer groups is the same as the number of the converter valve groups, each of the single-phase transformer groups includes: a plurality of single-phase transformers, the number of the single-phase transformers is the same as the number of bridge arms of each of the converter valve groups, and the other side windings of the plurality of single-phase transformers are connected in series and then connected to the second AC system.
  • the second transformer includes: a plurality of three-phase transformers or a plurality of single-phase transformer groups, and the number of the three-phase transformers and the number of the single-phase transformer groups are the same as the number of the converter valve groups.
  • one side winding of the first transformer adopts a Y-type connection.
  • one end of a winding on one side of the first transformer is connected in series with a bridge arm of the converter valve group in a one-to-one correspondence, and the other end of a winding on one side of the first transformer is connected in series with another bridge arm to form a series circuit.
  • a winding on one side of the second transformer connected to the first AC system adopts a Y-type connection.
  • the AC power transmission system includes: a converter, the converter includes: a plurality of converter valve groups, one end of each converter valve group is connected to a first AC system, each bridge arm at the other end of each converter valve group is connected in series with a winding on one side of a first transformer, and the winding on the other side of the first transformer is connected to a second AC system; the present disclosure connects a winding on one side of the transformer to each bridge arm of the converter, and can utilize the winding to simultaneously suppress interphase circulating current and improve the utilization rate of IGBT switching devices in the converter, thereby eliminating the reactance of the converter bridge arm while ensuring the normal operation of the converter valve, thereby reducing the system impedance and improving the transmission capacity of the system.
  • FIG1 is a specific example diagram of an AC power transmission system in an embodiment of the present disclosure.
  • FIG2 is a principle block diagram of a partial example in which the first transformer is a single-phase transformer in the embodiment of the present disclosure
  • FIG3 is another partial example diagram of the first transformer in the embodiment of the present disclosure where the first transformer is a single-phase transformer;
  • FIG4 is a principle block diagram of another partial example in which the first transformer is a single-phase transformer in the embodiment of the present disclosure
  • FIG. 5 is another specific example diagram of the AC power transmission system in the embodiment of the present disclosure.
  • the terms “installed”, “connected”, and “connected” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two elements, it can be a wireless connection, or it can be a wired connection.
  • installed installed
  • connected should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two elements, it can be a wireless connection, or it can be a wired connection.
  • the present disclosure discloses an AC power transmission system, as shown in FIG1 , including:
  • the converter 10 includes: a plurality of converter valve groups 101, one end of each of the converter valve groups 101 is connected to the first AC system 20, each bridge arm at the other end of each of the converter valve groups is connected in series with one side winding of the first transformer 30, and the other side winding of the first transformer 30 is connected to the second AC system 40.
  • the first AC system 20 can be an industrial frequency system (i.e., an AC power with a frequency of 50 Hz) or a low frequency system (i.e., a low frequency AC power with a frequency of 0 to 49 Hz).
  • the second AC system 40 can also be an industrial frequency system or a low frequency system.
  • the first AC system 20 is an industrial frequency system
  • the second AC system 40 is a low frequency system
  • the first AC system 20 is a low frequency system
  • the second AC system 40 is an industrial frequency system.
  • the embodiments of the present disclosure do not specifically limit the specific frequency values of the first AC system 20, the second AC system 40, and the low frequency AC power, and those skilled in the art can determine them according to actual needs.
  • each converter 10 includes three converter valve groups 101 , each converter valve group 101 includes three bridge arms, and each bridge arm includes a plurality of full-bridge sub-modules, which may be H-bridge sub-modules.
  • the first transformer 30 may include multiple three-phase transformers, or multiple single-phase transformer groups.
  • the number of three-phase transformers and the number of single-phase transformer groups are the same as the number of converter valve groups 101. In the embodiment of the present disclosure, the number of three-phase transformers and the number of single-phase transformer groups are both three.
  • each single-phase transformer group includes: multiple single-phase transformers, the number of single-phase transformers is the same as the number of bridge arms of each converter valve group 101.
  • the number of single-phase transformers in each single-phase transformer group is three, and one side winding of the three single-phase transformers is connected in series with the bridge arm of the converter valve group 101.
  • the bridge arm of the converter valve group 101 As shown in Figures 2 and 4, after one bridge arm of each converter valve group 101 is connected in series with one end of a winding on one side of the first transformer 30, the other end of each winding on one side of the first transformer 30 is connected in a Y-type connection, or as shown in Figure 3, after one bridge arm of each converter valve group 101 is connected in series with one winding on one side of the first transformer 30 in a one-to-one correspondence, the three bridge arms are connected in series to form a series circuit, and the other side windings are connected in parallel (as shown in Figure 2) or in series (as shown in Figure 4) and connected to the second AC system 40.
  • each of the above windings When the other end of each of the above windings is connected in a Y-type connection, one end of each winding can be directly connected together, or can be connected together and then grounded.
  • the AC power transmission system includes: a converter, the converter includes: a plurality of converter valve groups, one end of each converter valve group is connected to a first AC system, each bridge arm at the other end of each converter valve group is connected in series with a winding on one side of a first transformer, and the winding on the other side of the first transformer is connected to a second AC system; thus, the present disclosure connects a winding on one side of the transformer to each bridge arm of the converter, and can utilize the winding to simultaneously suppress interphase circulating current and improve the utilization rate of IGBT switching devices in the converter, thereby eliminating the reactance of the converter bridge arm while ensuring the normal operation of the converter valve, reducing the system impedance, and improving the transmission capacity of the system.
  • one side winding of the first transformer 30 adopts a Y-type connection.
  • a second transformer 50 is provided between the first AC system 20 and the converter 10.
  • the second transformer 50 may include multiple three-phase transformers or multiple single-phase transformer groups.
  • the number of three-phase transformers and the number of single-phase transformer groups are the same as the number of converter valve groups 101. In the embodiment of the present disclosure, the number of three-phase transformers and the number of single-phase transformer groups are both 3.
  • the embodiment of the present disclosure does not specifically limit the second transformer 50, and those skilled in the art can determine it according to actual conditions.
  • the winding on one side of the second transformer 50 connected to the first AC system 20 also adopts a Y-type connection. Like the first transformer 30, when the winding on one side adopts a Y-type connection, one end of each winding can be directly connected together, or it can be connected together and then grounded.
  • the embodiment of the present disclosure discloses an AC power transmission system, including: a converter, the converter including: a plurality of converter valve groups, one end of each of the converter valve groups is connected to a first AC system, each bridge arm at the other end of each of the converter valve groups is connected in series with a winding on one side of a first transformer, and the winding on the other side of the first transformer is connected to a second AC system.
  • the present disclosure connects a winding on one side of the transformer to each bridge arm of the converter, and can utilize the winding to simultaneously suppress interphase circulating current and improve the utilization rate of IGBT switching devices in the converter, while ensuring the normal operation of the converter valve, eliminating the reactance of the converter bridge arm, thereby reducing the system impedance and improving the transmission capacity of the system.

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

Abstract

Selon des modes de réalisation, la présente divulgation concerne un système de transmission de puissance à courant alternatif, comprenant : un convertisseur. Le convertisseur comprend une pluralité de groupes de valves de convertisseur, une extrémité de chaque groupe de valves de convertisseur est connectée à un premier système de courant alternatif, chaque bras de pont de l'autre extrémité de chaque groupe de valves de convertisseur est connecté à un enroulement sur un côté d'un premier transformateur en série, et un enroulement de l'autre côté du premier transformateur est connecté à un second système de courant alternatif. Selon la présente divulgation, un enroulement sur un côté d'un transformateur est connecté à chaque bras de pont d'un convertisseur, de sorte que l'enroulement puisse être utilisé pour inhiber simultanément un courant de circulation d'interphase et améliorer le taux d'utilisation d'un dispositif de commutation IGBT dans le convertisseur, la réactance des bras de pont du convertisseur est omise tandis que le travail normal d'une valve de convertisseur est assuré, et ainsi l'impédance du système peut être réduite, et la capacité de transmission du système est améliorée.
PCT/CN2022/131388 2022-11-11 2022-11-11 Système de transmission de puissance à courant alternatif WO2024098381A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/CN2022/131388 WO2024098381A1 (fr) 2022-11-11 2022-11-11 Système de transmission de puissance à courant alternatif

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Application Number Priority Date Filing Date Title
PCT/CN2022/131388 WO2024098381A1 (fr) 2022-11-11 2022-11-11 Système de transmission de puissance à courant alternatif

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WO2024098381A1 true WO2024098381A1 (fr) 2024-05-16

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3223419A1 (fr) * 2016-03-22 2017-09-27 GE Energy Power Conversion Technology Ltd Ensemble convertisseur ac-ac direct et système de conversion utilisant celui-ci
CN113381620A (zh) * 2021-06-30 2021-09-10 全球能源互联网研究院有限公司 一种交流输电系统
CN113794226A (zh) * 2021-08-13 2021-12-14 中国电力工程顾问集团中南电力设计院有限公司 一种海上风电场低频交流输电系统
CN215267650U (zh) * 2021-07-13 2021-12-21 全球能源互联网研究院有限公司 一种基于接地结构的低频输电系统
CN114977832A (zh) * 2022-06-22 2022-08-30 国网浙江省电力有限公司电力科学研究院 模块化多电平矩阵式换流器的桥臂及桥臂电抗器布置方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3223419A1 (fr) * 2016-03-22 2017-09-27 GE Energy Power Conversion Technology Ltd Ensemble convertisseur ac-ac direct et système de conversion utilisant celui-ci
CN113381620A (zh) * 2021-06-30 2021-09-10 全球能源互联网研究院有限公司 一种交流输电系统
CN215267650U (zh) * 2021-07-13 2021-12-21 全球能源互联网研究院有限公司 一种基于接地结构的低频输电系统
CN113794226A (zh) * 2021-08-13 2021-12-14 中国电力工程顾问集团中南电力设计院有限公司 一种海上风电场低频交流输电系统
CN114977832A (zh) * 2022-06-22 2022-08-30 国网浙江省电力有限公司电力科学研究院 模块化多电平矩阵式换流器的桥臂及桥臂电抗器布置方法

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