CN116316786A - New energy direct current delivery system without conventional power supply support - Google Patents

New energy direct current delivery system without conventional power supply support Download PDF

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Publication number
CN116316786A
CN116316786A CN202310588554.7A CN202310588554A CN116316786A CN 116316786 A CN116316786 A CN 116316786A CN 202310588554 A CN202310588554 A CN 202310588554A CN 116316786 A CN116316786 A CN 116316786A
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CN
China
Prior art keywords
valve
direct current
converter
new energy
end converter
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.)
Pending
Application number
CN202310588554.7A
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Chinese (zh)
Inventor
周兴达
唐博进
苟立峰
王一凡
郭明珠
贾娜
王武斌
朱小毅
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.)
Beijing Gezhouba Electric Power Rest House
China Three Gorges Corp
Original Assignee
Beijing Gezhouba Electric Power Rest House
China Three Gorges Corp
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 Beijing Gezhouba Electric Power Rest House, China Three Gorges Corp filed Critical Beijing Gezhouba Electric Power Rest House
Priority to CN202310588554.7A priority Critical patent/CN116316786A/en
Publication of CN116316786A publication Critical patent/CN116316786A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • 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
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
    • 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
    • H02M7/505—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 using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/515—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 using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/521—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 using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention provides a new energy direct current delivery system without a conventional power supply support, and belongs to the field of new energy. The system comprises: a transmitting end converter valve, a receiving end converter valve and a high-voltage direct-current transmission line; the sending end converter valve is used for converting alternating current of the new energy generator set into direct current, and conveying the direct current to the receiving end converter valve through the high-voltage direct current transmission line, and comprises a diode valve and a first modularized multi-level converter; the receiving end converter valve is used for converting direct current into alternating current and transmitting the converted alternating current to the power system, and comprises a thyristor valve and a second modularized multi-level converter. According to the invention, in the feed-end converter valve, the low-cost diode valve is connected with the first modularized multi-level converter in parallel, and in the receiving-end converter valve, the low-cost thyristor valve is connected with the second modularized multi-level converter in parallel, so that the capacity required by the modularized multi-level converter is reduced, and the construction cost of the feed-end converter valve and the receiving-end converter valve is saved.

Description

New energy direct current delivery system without conventional power supply support
Technical Field
The invention relates to the field of new energy, in particular to a new energy direct current delivery system without a conventional power supply support.
Background
Direct-current extra-high voltage is the main force army for conveying renewable energy sources and occupies a large part of an extra-high voltage transmission line. The large-scale hydroelectric base is almost completely sent out through direct current, but the direct current circuit put into operation still takes the traditional energy source for conveying single variety (water and fire) as the main energy source, and as the new energy source main base is further propelled, the stock direct current circuit is gradually bundled, and the follow-up extra-high voltage direct current circuit is expected to be built around the new energy source main base.
In the ultra-high voltage direct current engineering of the new energy large base, most of the ultra-high voltage direct current engineering adopts a scheme of thyristor converter valves ((Line Commutated Converter, LCC) at a transmitting end and a receiving end, but LCC is subjected to phase conversion by an alternating current system, so that phase conversion failure is easy to occur.
Disclosure of Invention
The invention provides a new energy Direct Current (DC) delivery system without a conventional power supply support, which aims to reduce the construction cost of a delivery end and a receiving end of the new energy DC delivery system.
The system comprises: a transmitting end converter valve, a receiving end converter valve and a high-voltage direct-current transmission line;
the sending end converter valve is used for converting alternating current of the new energy generator set into direct current, and conveying the direct current to the receiving end converter valve through the high-voltage direct current transmission line, and comprises a diode valve and a first modularized multi-level converter;
the receiving end converter valve is used for converting direct current into alternating current and transmitting the converted alternating current to the power system, and comprises a thyristor valve and a second modularized multi-level converter.
In consideration of the problem that in a new energy direct current delivery system, a thyristor converter valve is easy to generate a commutation failure, and a full-capacity modularized multi-level converter is adopted at the same time at a transmitting end converter valve and a receiving end converter valve, the problem that cost is too high is caused.
With reference to the first aspect, in a first embodiment of the first aspect, the diode valve is connected in parallel with the dc side of the first modular multilevel converter.
With reference to the first embodiment of the first aspect, in a second embodiment of the first aspect, the diode valve and the ac side of the first modular multilevel converter are connected to the new energy generating set through respective transformers, respectively.
With reference to the second embodiment of the first aspect, in a third embodiment of the first aspect, the diode valve is used to rectify alternating current generated by the new energy generator set into direct current.
With reference to the third embodiment of the first aspect, in a fourth embodiment of the first aspect, the first modular multilevel converter is configured to provide a grid-connected voltage to the new energy generator set.
In the sending end converter valve, alternating current is rectified into direct current through adopting a low-cost diode valve, a first modularized multi-level converter is adopted to provide grid-connected voltage for a new energy generator set, compared with the fact that the sending end converter valve adopts a full-capacity modularized multi-level converter to realize a rectification function and a grid-connected voltage supporting function, the capacity of the first modularized multi-level converter is smaller than that of the full-capacity modularized multi-level converter, the through-flow requirement of a sub-module of a bridge arm of the first modularized multi-level converter is smaller than that of a sub-module of the full-capacity modularized multi-level converter, and the construction cost of the sending end converter valve is reduced.
With reference to the first aspect, in a fifth embodiment of the first aspect, the thyristor valve is connected in parallel with the dc side of the second modular multilevel converter.
With reference to the fifth embodiment of the first aspect, in a sixth embodiment of the first aspect, the thyristor valve and the ac side of the second modular multilevel converter are connected to the power system by respective transformers, respectively.
With reference to the sixth embodiment of the first aspect, in a seventh embodiment of the first aspect, the thyristor valve is used for converting direct current power delivered by the high voltage direct current power transmission line into alternating current power.
With reference to the seventh embodiment of the first aspect, in an eighth embodiment of the first aspect, the second modular multilevel converter is configured to smooth the high voltage dc side voltage delivered by the high voltage dc power line.
In the receiving end converter valve, direct current is inverted into alternating current by adopting a low-cost thyristor valve, and high-voltage direct current side voltage conveyed by a stable high-voltage direct current transmission line of a second modularized multi-level converter is adopted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a new energy dc delivery system without conventional power support according to an exemplary embodiment.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In order to reduce the construction cost of a transmitting end and a receiving end of a new energy Direct Current (DC) transmitting system while improving the commutation success rate, the invention provides a new energy DC transmitting system without a conventional power supply support.
Fig. 1 is a schematic diagram of a new energy dc delivery system without conventional power support according to an exemplary embodiment. The system comprises: a feed-side converter valve 101, a receiving-side converter valve 102, and a high-voltage dc power line 103.
The transmitting-end converter valve 101 is configured to convert alternating current of the new energy generator set into direct current, and transmit the direct current to the receiving-end converter valve 102 through the high-voltage direct current transmission line 103, where the transmitting-end converter valve 101 includes a diode valve 1011 and a first modular multilevel converter 1012.
In an alternative embodiment, the new energy generator set includes, but is not limited to, a wind generator set and a photovoltaic generator set.
In an alternative embodiment, diode valve 1011 refers to a semiconductor valve having a diode as the primary semiconductor device.
The receiving-end converter valve 102 is configured to convert direct current into alternating current, and transmit the converted alternating current to the power system, where the receiving-end converter valve 102 includes a thyristor valve 1021 and a second modular multilevel converter 1022.
In an alternative embodiment, the thyristor valve 1021 is a semiconductor converter valve composed of a thyristor element and its auxiliary equipment.
Considering that in the new energy direct current delivery system, the thyristor converter valve is easy to generate a commutation failure, and the problem that the cost is too high is caused by adopting the full-capacity modularized multi-level converter at the same time at the transmitting end converter valve 101 and the receiving end converter valve 102 is solved, in the new energy direct current delivery system provided by the embodiment of the invention, the diode valve 1011 is utilized to realize a rectifying function in the transmitting end converter valve 101, the first modularized multi-level converter 1012 provides a grid-connected voltage for a new energy generator set without a conventional power supply support, in the receiving end converter valve 102, the thyristor valve 1021 is utilized to realize an inversion function, and the second modularized multi-level converter 1022 is used for stabilizing a high-voltage direct current side voltage.
In one example, diode valve 1011 is connected in parallel with the dc side of first modular multilevel converter 1012.
In one example, diode valve 1011 and the ac side of first modular multilevel converter 1012 are each connected to a new energy generator set through a respective transformer.
In one example, diode valve 1011 is used to rectify the alternating current from the new energy generator set into direct current.
In an example, the first modular multilevel converter 1012 is used to provide a grid-connected voltage to the new energy generator set, i.e. the first modular multilevel converter 1012 operates in a voltage source mode, so that the new energy generator set can also generate power without the support of a conventional power source.
In the transmitting-end converter valve 101, the alternating current is rectified into the direct current by adopting the low-cost diode valve 1011, the grid-connected voltage is provided for the new energy generator set by adopting the first modularized multi-level converter 1012, compared with the fact that the rectifying function and the grid-connected voltage supporting function are realized by adopting the full-capacity modularized multi-level converter at the transmitting-end converter valve 101, the capacity of the first modularized multi-level converter 1012 is smaller than that of the full-capacity modularized multi-level converter, the through-flow requirement of the sub-module of a bridge arm of the first modularized multi-level converter 1012 is smaller than that of the sub-module of the full-capacity modularized multi-level converter, and the construction cost of the transmitting-end converter valve 101 is reduced.
In one example, the thyristor valve 1021 is in parallel with the dc side of the second modular multilevel converter 1022.
In one example, the ac side of the thyristor valve 1021 and the second modular multilevel converter 1022 are each connected to the power system through a respective transformer.
In one example, the thyristor valve 1021 is used to convert the dc power delivered by the high voltage dc power line 103 into ac power.
In one example, the second modular multilevel converter 1022 is used to smooth the high-voltage dc side voltage delivered by the high-voltage dc power line 103.
In the receiving-end converter valve 102, inversion of direct current into alternating current is achieved by adopting a low-cost thyristor valve 1021, and high-voltage direct current side voltage conveyed by the high-voltage direct current power transmission line 103 is stabilized by adopting a second modularized multi-level converter 1022, compared with the inversion function and the stabilization voltage function achieved by adopting a full-capacity modularized multi-level converter in the receiving-end converter valve 102, the capacity of the second modularized multi-level converter 1022 is smaller than that of the full-capacity modularized multi-level converter, and the through-flow requirement of a sub-module of a bridge arm of the second modularized multi-level converter 1022 is smaller than that of a sub-module of the full-capacity modularized multi-level converter, so that the construction cost of the receiving-end converter valve 102 is further reduced.
In an example, taking a 4GW outgoing channel of a new energy power generation base as an example, no conventional power source such as coal-fired power generation, gas power generation, nuclear power, water power and the like exists in the new energy power generation base, only new energy power generation sets such as photovoltaic power generation sets and fans are provided, firstly, the photovoltaic power generation sets and the fans are boosted to 500kV alternating voltage through alternating current collection, and then are connected to a sending-end converter valve 101, the capacity of a diode valve 1011 in the sending-end converter valve 101 is 3GW, the transformer transformation ratio of the alternating current side of the diode valve 1011 is 1:1, the capacity of a first modularized multi-level converter 1012 in the sending-end converter valve 101 is 1:1. The diode valve 1011 and the first modular multilevel converter 1012 are connected in parallel dc and then connected to the hvdc transmission line 103, the hvdc voltage being ±400kV. The capacity of the receiving-end converter valve 102 is 4GW in total, wherein the capacity of the thyristor valve 1021 is 3GW, the transformer transformation ratio of the alternating current side of the thyristor valve 1021 is 1:1, the capacity of the second modularized multi-level converter 1022 is 1GW, and the transformer transformation ratio of the alternating current side of the second modularized multi-level converter 1022 is 1:1. The ac side of the receiving converter valve 102 is connected to a receiving 500kV ac grid. In the embodiment of the present invention, the capacity of the first modular multilevel converter 1012 and the capacity of the second modular multilevel converter 1022 are both 1GW, if only the modular multilevel converters are adopted in the transmitting-end converter valve 101 and the receiving-end converter valve 102, the capacities of the modular multilevel converters in the transmitting-end converter valve 101 and the receiving-end converter valve 102 are both 4GW, and compared with the 1GW capacity in the embodiment of the present invention, the capacities of the modular multilevel converters are greatly reduced, the submodule through-flow requirements in the corresponding modular multilevel converters are correspondingly reduced, and the construction costs of the transmitting-end converter valve 101 and the receiving-end converter valve 102 are reduced.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is merely exemplary of embodiments of the present invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A new energy dc delivery system without conventional power support, the system comprising: a transmitting end converter valve, a receiving end converter valve and a high-voltage direct-current transmission line;
the transmitting end converter valve is used for converting alternating current of the new energy generator set into direct current, and transmitting the direct current to the receiving end converter valve through the high-voltage direct current transmission line, and comprises a diode valve and a first modularized multi-level converter;
the receiving end converter valve is used for converting the direct current into alternating current and transmitting the converted alternating current to the power system, and comprises a thyristor valve and a second modularized multi-level converter.
2. The system of claim 1, wherein the diode valve is connected in parallel with a dc side of the first modular multilevel converter.
3. The system of claim 2, wherein the diode valve and the ac side of the first modular multilevel converter are each connected to the new energy generator set via a respective transformer.
4. A system according to claim 3, wherein the diode valve is adapted to rectify ac power from the new energy generator set into dc power.
5. The system of claim 4, wherein the first modular multilevel converter is configured to provide a grid-tie voltage to the new energy generator set.
6. The system of claim 1, wherein the thyristor valve and the dc side of the second modular multilevel converter are connected in parallel.
7. The system of claim 6, wherein the thyristor valve and the ac side of the second modular multilevel converter are each connected to the power system by a respective transformer.
8. The system of claim 7, wherein the thyristor valve is configured to convert direct current power delivered by the high voltage direct current power line to alternating current power.
9. The system of claim 8, wherein the second modular multilevel converter is configured to smooth a high voltage dc side voltage delivered by the high voltage dc power line.
CN202310588554.7A 2023-05-24 2023-05-24 New energy direct current delivery system without conventional power supply support Pending CN116316786A (en)

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Cited By (1)

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CN116722577A (en) * 2023-08-10 2023-09-08 长江三峡集团实业发展(北京)有限公司 New energy direct current output topology circuit and system

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CN109802421A (en) * 2019-01-30 2019-05-24 华中科技大学 A kind of mixing converter valve DC transmission system and its control method
CN214674375U (en) * 2020-12-31 2021-11-09 中国长江三峡集团有限公司 Multi-terminal offshore wind power flexible direct current and energy storage cooperative grid-connected system
CN113746125A (en) * 2020-05-27 2021-12-03 南京南瑞继保电气有限公司 Fault ride-through method and device for receiving-end series-parallel direct-current transmission system
CN113783217A (en) * 2021-07-02 2021-12-10 中电普瑞电力工程有限公司 Flexible direct current transmission system

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CN102222929A (en) * 2011-06-24 2011-10-19 梁一桥 DC (Direct Current) power transmission system with function of unidirectionally transmitting power
WO2017084120A1 (en) * 2015-11-19 2017-05-26 华中科技大学 Unidirectional direct current-direct current autotransformer, and high-low voltage side fault isolation method therefor
CN106100404A (en) * 2016-06-07 2016-11-09 南方电网科学研究院有限责任公司 Modular multilevel converter and use method thereof
CN107204626A (en) * 2017-06-09 2017-09-26 电子科技大学 A kind of LCC MMC interlock hybrid bypolar DC transmission system
CN107565590A (en) * 2017-09-06 2018-01-09 合肥工业大学 The mixed high-voltage DC transmission system sent outside suitable for wind-powered electricity generation
CN109802421A (en) * 2019-01-30 2019-05-24 华中科技大学 A kind of mixing converter valve DC transmission system and its control method
CN113746125A (en) * 2020-05-27 2021-12-03 南京南瑞继保电气有限公司 Fault ride-through method and device for receiving-end series-parallel direct-current transmission system
CN214674375U (en) * 2020-12-31 2021-11-09 中国长江三峡集团有限公司 Multi-terminal offshore wind power flexible direct current and energy storage cooperative grid-connected system
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116722577A (en) * 2023-08-10 2023-09-08 长江三峡集团实业发展(北京)有限公司 New energy direct current output topology circuit and system
CN116722577B (en) * 2023-08-10 2023-10-20 长江三峡集团实业发展(北京)有限公司 New energy direct current output topology circuit and system

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Application publication date: 20230623