CN117559536A - Hybrid offshore wind power transmission system and operation method - Google Patents
Hybrid offshore wind power transmission system and operation method Download PDFInfo
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- CN117559536A CN117559536A CN202311578346.5A CN202311578346A CN117559536A CN 117559536 A CN117559536 A CN 117559536A CN 202311578346 A CN202311578346 A CN 202311578346A CN 117559536 A CN117559536 A CN 117559536A
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- 238000004804 winding Methods 0.000 claims description 46
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000009466 transformation Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
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- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
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Classifications
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- 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
- H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
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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
- H02M7/02—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
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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
- H02M7/02—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
-
- 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
- H02M7/219—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 in a bridge configuration
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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
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention provides a hybrid offshore wind power transmission system and an operation method, wherein a current conversion component of the transmission system comprises a controllable device bridge arm module and two uncontrollable device bridge arm modules, and the controllable device bridge arm modules are used for black start of an offshore wind farm or rectification and transmission of alternating current generated by the wind farm; the uncontrolled device bridge arm module is used for rectifying and sending alternating current generated by the wind power plant. The controllable device bridge arm module and the uncontrolled device bridge arm module are mixed to form the converter assembly, so that power output of the wind power plant is achieved, black start of the wind power plant is achieved, and advantages of the diode and the controllable device can be considered. According to the hybrid offshore wind power transmission system, black start of the offshore side is achieved through the combination of the modules, meanwhile, the capacity of each device is relatively small, the overall size and the weight of the offshore side are not increased, the advantage of small size of the end conveying system can be guaranteed, and meanwhile the problem of black start of the end conveying system can be effectively solved.
Description
Technical Field
The invention relates to the technical field of offshore wind power generation, in particular to a hybrid offshore wind power transmission system and an operation method.
Background
With the large-scale development of offshore resources, in the dual context of energy demand and the "two carbon" goal, the trend of the offshore wind farm from offshore to offshore and from small-scale to large-scale concentrated development becomes necessary in order to obtain more wind energy resources. The high-voltage direct current delivery technology is a necessary choice for delivering long-distance and large-capacity offshore wind power, so that the large-scale offshore converter station platform is adopted to collect and boost the output electric energy of the wind power plant and then transmit the electric energy to land, and the high-voltage direct current delivery technology is an important technical means. The converter platform mainly depends on the topology structure adopted by the direct current transmission system.
At present, the light offshore platform topological structure is mainly in a diode type structure, but the diode structure cannot realize the fast black start of an offshore wind power system and becomes a main limiting factor for restricting the engineering application of the diode structure. Therefore, the current converter assembly needs to be correspondingly improved, and the black start capability of the whole power transmission system can be realized while the light weight is ensured.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention aims to provide a hybrid offshore wind power transmission system and an operation method thereof, so as to take advantages of a diode and a controllable device into account, on one hand, effectively reduce the weight of a system platform, and on the other hand, keep the black start capability of the controllable device, and realize flexible black start of a wind field at a transmitting end.
To achieve the above object, the present invention provides a hybrid offshore wind power transmission system including:
an offshore wind farm;
the multi-winding transformer module comprises at least three windings, and alternating current output by the offshore wind farm is connected with a first winding of the multi-winding transformer module through an offshore alternating current bus;
the alternating-current side of the converter assembly is connected with the second winding of the multi-winding transformer module, and the converter assembly comprises a controllable device bridge arm module and two uncontrolled device bridge arm modules; the controllable device bridge arm module is used for black start of the offshore wind farm or rectification and transmission of alternating current after transformation of the second winding; the uncontrolled device bridge arm module 400 is configured to rectify and send the alternating current after the transformation of the second winding.
Preferably, the direct current sides of the controllable device bridge arm module and the two uncontrolled device bridge arm modules are respectively connected with a direct current sea cable so as to send the rectified direct current to the land power station.
Preferably, the transformer further comprises a first branch, one end of the first branch is connected to a third winding of the multi-winding transformer module, the other end of the first branch is connected to an offshore alternating current bus, and an AC/DC/AC converter module, a three-phase transformer module and a switch module are sequentially connected in the first branch; when the wind farm transmits power normally, the switch module is disconnected; when the wind power plant is started in black, the switch module is closed.
Preferably, the uncontrolled device bridge arm module comprises a plurality of diodes connected in series.
Preferably, the controllable device bridge arm module comprises a plurality of controllable devices connected in series, and the controllable devices comprise transistors and diodes connected in anti-parallel with the transistors.
Preferably, the controllable device bridge arm module comprises one of a half-bridge MMC structure and a full-bridge MMC structure.
Preferably, the half-bridge MMC structure includes a plurality of half-bridge sub-modules connected in series, and the half-bridge sub-modules include transistors T1 and T2, diodes D1 and D2, and a capacitor C1; transistors T1 and T2 are antiparallel to diodes D1 and D2, respectively, and a capacitor C1 is parallel to transistor T1, and the collector of T1 is connected to the emitter of T2.
Preferably, the full-bridge MMC structure comprises a plurality of full-bridge sub-modules in series, the full-bridge sub-modules comprising transistors T3, T4, T5, T6, diodes D3, D4, D5, D6; diodes D3, D4, D5 and D6 are respectively connected with transistors T3, T4, T5 and T6 in anti-parallel, a collector of T3 is connected with an emitter of T4, a collector of T5 is connected with an emitter of T6, an emitter of T3 is connected with an emitter of T5, a collector of T4 is connected with a collector of T6, and two polar plates of a capacitor C2 are respectively connected to an emitter of T4 and an emitter of T6.
The invention also provides an operation method of the hybrid offshore wind power transmission system, which comprises the following steps:
when the wind power plant normally transmits power, the switch module is disconnected, the first branch does not work, and alternating current output by the offshore wind power plant is transmitted to the direct current submarine cable through the converter assembly
Preferably, when the wind farm is started in black, the switch module is closed, the direct-current voltage of the direct-current sea cable is transmitted to the direct-current side of the controllable device bridge arm module, single-phase alternating-current voltage is formed on the alternating-current side after the direct-current voltage is converted by the controllable device bridge arm module, then the single-phase alternating-current voltage is transmitted to the AC/DC/AC converter module after being transformed by the third winding of the multi-winding transformer module, and the single-phase alternating-current voltage is converted into direct-current by the AC/DC/AC converter module, and then is converted into three-phase alternating-current by three-phase inversion; the three-phase alternating current is boosted through the three-phase transformer module, so that the end-feeding fan is driven, and black start of the wind power plant is realized.
As described above, the invention provides a hybrid offshore wind power transmission system and an operation method thereof, wherein a current conversion assembly of the power transmission system comprises a controllable device bridge arm module and two uncontrollable device bridge arm modules, and the controllable device bridge arm modules are used for black start of an offshore wind farm or rectification and transmission of alternating current generated by the wind farm; the uncontrolled device bridge arm module is used for rectifying and sending alternating current generated by the wind power plant. The controllable device bridge arm module and the uncontrolled device bridge arm module are mixed to form the converter assembly, so that power of a wind power plant is sent out, black start of the wind power plant is realized, advantages of a diode and the controllable device can be considered, on one hand, the weight of a system platform is effectively reduced, on the other hand, black start capacity of the controllable device is reserved, and flexible black start of the wind power plant at a sending end is realized.
According to the hybrid offshore wind power transmission system, black start of the offshore side is achieved through the combination of the modules, meanwhile, the capacity of each device is relatively small, the overall size and the weight of the offshore side are not increased, the advantage of small size of the end conveying system can be guaranteed, and meanwhile the problem of black start of the end conveying system can be effectively solved.
Drawings
FIG. 1 is a schematic diagram of the offshore wind power transmission system.
Fig. 2 shows a schematic diagram of the direct series connection of bridge arm modules of controllable devices according to the present invention.
Fig. 3 shows a schematic connection diagram of a bridge arm module of the controllable device according to the present invention using a half-bridge MMC structure.
Fig. 4 shows a connection schematic diagram of a bridge arm module of the controllable device according to the present invention using a full-bridge MMC structure.
Description of element reference numerals
100. Multi-winding transformer module, 300, controllable device bridge arm module, 400, uncontrolled device bridge arm module, 200, AC/DC/AC converter module, 500, three-phase transformer module, 600, switch module
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be changed at will, and the layout of the components may be more complex.
The alternating current transmission scheme cannot meet the requirement of large-scale deep open sea offshore wind power development, and the traditional direct current transmission scheme is high in cost and difficult to meet the requirement of large-scale offshore wind power economic development. The method has the advantages that a novel low-cost sending scheme is necessary to be explored, a novel technology is provided for deep open sea offshore wind power development, a large-scale alternating current sending scheme and a plurality of direct current sending and converting schemes are selected, the direct current sending mainstream scheme in the practical application is a flexible direct current transmission technology based on MMC topology at present, but the size and the weight of a platform are large, the manufacturing cost are high, so that the large-scale offshore wind power sending scheme needs to be further optimized, a unidirectional current type uncontrolled rectifying converter based on diode elements is adopted at a sending end to help to realize the light-weight of an offshore platform, but the prior scheme still has several remarkable defects, including that a wind power plant cannot be started in black, and a land power supply is specially arranged to be connected into an offshore converting platform or a mixed converter connected with a VSC converter in series-parallel mode is adopted to assist in starting; the adoption of the pure diode scheme at the transmitting end is the most effective means for reducing the cost of the offshore wind power platform, but auxiliary branches are needed for black start of a wind power plant, the synchronous networking difficulty of the wind power plant is high, and the hybrid offshore wind power transmitting device and system are provided for solving the problem that the offshore wind power of the existing scheme adopts the black start of diode topology.
The embodiment provides a hybrid offshore wind power transmission system, as shown in fig. 1, specifically including:
an offshore wind farm;
the multi-winding transformer module 100, wherein the multi-winding transformer module 100 comprises at least three windings, and the alternating current output by the offshore wind farm is connected with the first winding of the multi-winding transformer module 100 through an offshore alternating current bus;
the alternating current side of the converter assembly is connected with the second winding of the multi-winding transformer module 100, and the converter assembly comprises a controllable device bridge arm module 300 and two uncontrolled device bridge arm modules 400; the controllable device bridge arm module 300 is used for black start of the offshore wind farm or rectification and transmission of alternating current after transformation of the second winding; the uncontrolled device bridge arm module 400 is configured to rectify and send the alternating current after the transformation of the second winding.
Further, the dc sides of the controllable device bridge arm module 300 and the two uncontrolled device bridge arm modules 400 are respectively connected to a dc sea cable, so as to send the rectified dc to the land power station.
Further, the transformer further comprises a first branch, one end of the first branch is connected to the third winding of the multi-winding transformer module 100, the other end of the first branch is connected to an offshore alternating current bus, and the first branch is internally and sequentially connected with the AC/DC/AC converter module 200, the three-phase transformer module 500 and the switch module 600;
when the wind farm transmits power normally, the switch module 600 is disconnected, the first branch does not work, and the alternating current output by the offshore wind farm is transmitted through the converter assembly; when the offshore wind farm is started in black, the switch module 600 is closed, and the direct-current voltage of the direct-current sea cable can form single-phase alternating-current voltage (taking phase a as an example) on the alternating-current side through the control of the controllable device bridge arm module 300, and then the single-phase alternating-current voltage is transformed by the third winding of the multi-winding transformer module 100 and then is transmitted to the AC/DC/AC converter module 200. The alternating voltage of the A phase is converted into direct current through an AC/DC/AC converter module, then is converted into three-phase alternating current through three-phase inversion, and the three-phase alternating current is boosted through a three-phase transformer module 500, so that a terminal blower is driven, and black start of a wind power plant is realized.
Further, the uncontrolled device bridge arm module 400 includes a plurality of diodes connected in series, the controllable device bridge arm module 300 includes a plurality of controllable devices connected in series, and the controllable device bridge arm module 300 may be one of a half-bridge MMC structure and a full-bridge MMC structure.
Further, as an example, as shown in fig. 2, the controllable device includes a transistor and a diode antiparallel to the transistor.
As an example, as shown in fig. 3, the half-bridge MMC structure includes a plurality of half-bridge sub-modules connected in series, where the half-bridge sub-modules include transistors T1 and T2, diodes D1 and D2, a capacitor C1, the transistor T1 is antiparallel to the diode D1, an emitter of the T1 is connected to an anode of the diode D1, the transistor T2 is antiparallel to the diode D2, a collector of the T2 is connected to a cathode of the D1, the capacitor C1 is parallel to the transistor T1, and a collector of the T1 is connected to an emitter of the T2.
As an example, as shown in fig. 4, the full-bridge MMC structure includes a plurality of full-bridge sub-modules connected in series, the full-bridge sub-modules include transistors T3, T4, T5, T6, diodes D3, D4, D5, D6, and diodes D3, D4, D5, D6 are respectively connected in antiparallel with the transistors T3, T4, T5, T6, T3 collector and T4 emitter are connected, T5 collector and T6 emitter are connected, T3 emitter and T5 emitter are connected, T4 collector and T6 collector are connected, and two plates of a capacitor C2 are respectively connected to the emitter of T4 and the T6 emitter. The transistor may be any one of an IGBT, an IGCT, and the like.
More specifically, the uncontrolled device bridge arm module 400 and the controllable device bridge arm module 300 each include an upper bridge arm and a lower bridge arm, and the upper bridge arm and the lower bridge arm include sub-modules with the same number. Specifically, the number of diodes connected in series of the upper bridge arm of the uncontrolled device bridge arm module 400 is the same as the number of diodes connected in series of the lower bridge arm; the number of the serially connected sub-modules of the upper bridge arm of the controllable device bridge arm module 300 is the same as that of the serially connected sub-modules of the lower bridge arm. Alternating current subjected to transformation by the second winding is connected between the upper bridge arm and the lower bridge arm, the submodule at the end part of the upper bridge arm is connected with a positive direct current sea cable, and the submodule at the end part of the lower bridge arm is connected with a negative direct current sea cable. It should be noted that, the specific form of the controllable device bridge arm module 300 is not limited to the above-mentioned half-bridge MMC structure and full-bridge MMC structure, and the circuit form thereof may be more complex as long as the converter function can be realized.
Based on the above power transmission system, the embodiment further provides an operation method, which includes the following steps:
s1: when the wind farm transmits power normally, the switch module 600 is disconnected, the first branch does not work, and the alternating current output by the offshore wind farm is transmitted through the converter assembly;
s2: when the wind farm is started in black, the switch module 600 is closed, the direct-current voltage of the direct-current sea cable is transmitted to the direct-current side of the controllable device bridge arm module 300, and after the direct-current voltage is converted by the controllable device bridge arm module 300, a single-phase alternating-current voltage (taking phase A as an example) is formed on the alternating-current side, and then the single-phase alternating-current voltage is transmitted to the AC/DC/AC converter module 200 after being transformed by the third winding of the multi-winding transformer module 100. The single-phase alternating voltage is converted into direct current through the AC/DC/AC converter module 200, then is converted into three-phase alternating current through three-phase inversion, and the three-phase alternating current is boosted through the three-phase transformer module 500, so that a terminal blower is driven, and black start of a wind power plant is realized.
In summary, the invention provides a hybrid offshore wind power transmission system and an operation method thereof, wherein a current conversion assembly of the transmission system comprises a controllable device bridge arm module and two uncontrollable device bridge arm modules, and the controllable device bridge arm modules are used for black start of an offshore wind farm or rectification and transmission of alternating current generated by the wind farm; the uncontrolled device bridge arm module is used for rectifying and sending alternating current generated by the wind power plant. The controllable device bridge arm module and the uncontrolled device bridge arm module are mixed to form the converter assembly, so that power of a wind power plant is sent out, black start of the wind power plant is realized, advantages of a diode and the controllable device can be considered, on one hand, the weight of a system platform is effectively reduced, on the other hand, black start capacity of the controllable device is reserved, and flexible black start of the wind power plant at a sending end is realized.
According to the hybrid offshore wind power transmission system, black start of the offshore side is achieved through the combination of the modules, meanwhile, the capacity of each device is relatively small, the overall size and the weight of the offshore side are not increased, the advantage of small size of the end conveying system can be guaranteed, and meanwhile the problem of black start of the end conveying system can be effectively solved.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (10)
1. A hybrid offshore wind power transmission system, the hybrid offshore wind power transmission system comprising:
an offshore wind farm;
the multi-winding transformer module comprises at least three windings, and alternating current output by the offshore wind farm is connected with a first winding of the multi-winding transformer module through an offshore alternating current bus;
the alternating-current side of the converter assembly is connected with the second winding of the multi-winding transformer module, and the converter assembly comprises a controllable device bridge arm module and two uncontrolled device bridge arm modules; the controllable device bridge arm module is used for black start of the offshore wind farm or rectification and transmission of alternating current after transformation of the second winding; the uncontrolled device bridge arm module 400 is configured to rectify and send the alternating current after the transformation of the second winding.
2. The hybrid offshore wind power transmission system of claim 1, wherein: the direct current sides of the controllable device bridge arm module and the two uncontrolled device bridge arm modules are respectively connected with a direct current sea cable so as to send the rectified direct current to the land power station.
3. The hybrid offshore wind power transmission system of claim 2, wherein: the multi-winding transformer comprises a multi-winding transformer module, a first branch circuit, a second branch circuit, a third winding, a second winding, a third winding and an alternating current bus, wherein the third winding is connected with the multi-winding transformer module, the second branch circuit is connected with the alternating current bus, and an AC/DC/AC converter module, a three-phase transformer module and a switch module are sequentially connected in the first branch circuit; when the wind farm transmits power normally, the switch module is disconnected; when the wind power plant is started in black, the switch module is closed.
4. The hybrid offshore wind power transmission system of claim 1, wherein: the uncontrolled device bridge arm module comprises a plurality of diodes which are connected in series.
5. The hybrid offshore wind power transmission system of claim 1, wherein: the controllable device bridge arm module comprises a plurality of controllable devices connected in series, wherein the controllable devices comprise transistors and diodes connected in anti-parallel with the transistors.
6. The hybrid offshore wind power transmission system of claim 1, wherein: the bridge arm module of the controllable device comprises one of a half-bridge MMC structure and a full-bridge MMC structure.
7. The hybrid offshore wind power transmission system of claim 6, wherein: the half-bridge MMC structure comprises a plurality of half-bridge submodules connected in series, wherein each half-bridge submodule comprises transistors T1 and T2, diodes D1 and D2 and a capacitor C1; transistors T1 and T2 are antiparallel to diodes D1 and D2, respectively, and a capacitor C1 is parallel to transistor T1, and the collector of T1 is connected to the emitter of T2.
8. The hybrid offshore wind power transmission system of claim 6, wherein: the full-bridge MMC structure comprises a plurality of full-bridge submodules connected in series, wherein each full-bridge submodule comprises transistors T3, T4, T5 and T6, and diodes D3, D4, D5 and D6; diodes D3, D4, D5 and D6 are respectively connected with transistors T3, T4, T5 and T6 in anti-parallel, a collector of T3 is connected with an emitter of T4, a collector of T5 is connected with an emitter of T6, an emitter of T3 is connected with an emitter of T5, a collector of T4 is connected with a collector of T6, and two polar plates of a capacitor C2 are respectively connected to an emitter of T4 and an emitter of T6.
9. A method of operating a hybrid offshore wind power transmission system according to any of claims 3-8, comprising the steps of:
when the wind power plant normally transmits power, the switch module is disconnected, the first branch circuit does not work, and alternating current output by the offshore wind power plant is transmitted to the direct current submarine cable through the converter assembly.
10. The method of operation of claim 9, wherein: when the wind power plant is started in black, the switch module is closed, the direct-current voltage of the direct-current sea cable is transmitted to the direct-current side of the controllable device bridge arm module, single-phase alternating-current voltage is formed on the alternating-current side after the direct-current voltage is converted by the controllable device bridge arm module, then the single-phase alternating-current voltage is transmitted to the AC/DC/AC converter module after being transformed by the third winding of the multi-winding transformer module, and the single-phase alternating-current voltage is converted into direct-current by the AC/DC/AC converter module, and then is converted into three-phase alternating-current by three-phase inversion; the three-phase alternating current is boosted through the three-phase transformer module, so that the end-feeding fan is driven, and black start of the wind power plant is realized.
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| CN202311578346.5A CN117559536A (en) | 2023-11-24 | 2023-11-24 | Hybrid offshore wind power transmission system and operation method |
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| CN202311578346.5A CN117559536A (en) | 2023-11-24 | 2023-11-24 | Hybrid offshore wind power transmission system and operation method |
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| CN202311578346.5A Pending CN117559536A (en) | 2023-11-24 | 2023-11-24 | Hybrid offshore wind power transmission system and operation method |
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| CN (1) | CN117559536A (en) |
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2023
- 2023-11-24 CN CN202311578346.5A patent/CN117559536A/en active Pending
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