CN105207257A - Offshore wind turbine grid connection method and system - Google Patents
Offshore wind turbine grid connection method and system Download PDFInfo
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- CN105207257A CN105207257A CN201510593123.5A CN201510593123A CN105207257A CN 105207257 A CN105207257 A CN 105207257A CN 201510593123 A CN201510593123 A CN 201510593123A CN 105207257 A CN105207257 A CN 105207257A
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- offshore wind
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- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- 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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Abstract
The invention discloses an offshore wind turbine grid connection method. The method includes the steps that after an offshore wind turbine converts wind energy into alternating current, the alternating current is boosted to proper voltage through a boosting transformer and connected to an alternating current bus; the alternating current bus collects the alternating current boosted by the boosting transformer; an offshore convertor station converts the alternating current collected on the alternating current bus into direct current; a submarine cable transmits the direct current converted by the offshore convertor station in a long distance; a land convertor station converts the direct current transmitted through the submarine cable into alternating current; a main transformer converts the alternating current converted through the land convertor station into a proper voltage grade, and the alternating current is connected into a main power grid. The invention further discloses an offshore wind turbine grid connection system. The problems existing in grid connection of an offshore wind plant with the long distance and large capacity are solved.
Description
Technical field
The present invention relates to electric power system technical field of new energies, particularly relate to a kind of offshore wind turbine combination method and system.
Background technology
Wind generating technology as in current renewable energy power generation the most effectively and development generation technology the most rapidly.Wherein, marine wind electric field is compared with land wind energy turbine set, and having unique several advantages, is the main trend of following Wind Power Development.
The advantage of marine wind electric field is mainly manifested in the following aspects: (1) marine wind speed is more land large and stable; (2) economize the land resource, reduce noise; (3) sea level frictional force is little, can useful life of extension device; (4) wind degree of cutting is little, does not need very high pylon, can reduce the cost of Wind turbines.
Current marine wind electric field due to scale smaller, general adopt the ac cable transmission synchronizing mode adding static reacance generator, ac transmission mode be after the alternating current boosting that wind-driven generator is sent by subsea AC cable transfer ashore.This synchronizing mode structure is simple, cost is low, but shortcoming is transmission range and capacity constraint, be applicable to low capacity, in-plant offshore grid-connected wind farm, and due to the voltage of wind power generation, the unsteadiness of frequency, often cause and use automatic quasi synchronous interchange synchronizing mode more difficult.Further, along with the continuous expansion of marine wind electric field scale, rated capacity is reached to the relatively large marine wind electric field of tens megawatts, because ac cable is to the restriction of transmission capacity, adopt the direct synchronizing mode of alternating current no longer applicable.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of offshore wind turbine combination method and system, the offshore grid-connected wind farm problem that offshore is distant to solve, capacity is larger.
In order to solve the problems of the technologies described above, the invention provides a kind of offshore wind turbine combination method, comprising:
Wind resource change is, after alternating current, be elevated to suitable voltage, and be linked into ac bus through step-up transformer by offshore wind turbine;
Ac bus collects the alternating current after the boosting of described step-up transformer;
The convert alternating current that described ac bus collects is direct current by marine current conversion station;
Direct current after described marine current conversion station conversion is carried out long-distance transmissions by submarine cable;
The DC power conversion that described submarine cable transmits by land current conversion station is alternating current;
By main transformer, the alternating current of described land current conversion station conversion is converted to suitable electric pressure, and becomes owner of electrical network.
Further, described offshore wind turbine is specially direct-driving permanent-magnetic wind-driven.
Present invention also offers a kind of offshore wind turbine grid-connected system, comprising:
Offshore wind turbine, for being alternating current by Wind resource change;
Step-up transformer, correspondingly with offshore wind turbine connects one by one, and the alternating current for being changed by the offshore wind turbine of correspondence is elevated to suitable voltage;
Ac bus, connects described step-up transformer, for collecting the alternating current after the boosting of described step-up transformer;
Marine current conversion station, be connected with described ac bus, the convert alternating current for will ac bus collect is direct current;
Submarine cable, is connected with described marine current conversion station, for the direct current after described marine current conversion station conversion is carried out long-distance transmissions;
Land current conversion station, is connected with described submarine cable, for being alternating current by the DC power conversion of transmission;
Main transformer, is connected with described land current conversion station, for the alternating current of described land current conversion station conversion is converted to suitable electric pressure, and becomes owner of electrical network.
Further, described offshore wind turbine is specially direct-driving permanent-magnetic wind-driven.
Implement the present invention, there is following beneficial effect:
1, when carrying equal-wattage, direct current transportation number of cables used is few, and circuit cost is low;
2, direct current transportation number of conductors is few, and its active loss is less;
3, direct current cables is in operation, and only has the resistance loss on heart yearn, does not have magnetic induction loss, therefore insulate aging slower than ac cable a lot, useful life is also corresponding longer than ac cable a lot, is suitable for laying down on sea bottom;
4, direct current transportation is without stationary problem, reliable, not existence and stability problem, and therefore its transmission distance is unrestricted, is suitable for the marine wind electric field that offshore is far away;
5, direct current transportation can regulate active power easily and quickly by converter and realize trend upset, and governing speed is fast.
6, can isolate the impact between the AC network fault of two ends, power direction is easy to control.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of an embodiment of offshore wind turbine combination method provided by the invention;
Fig. 2 is the system connection layout of an embodiment of offshore wind turbine grid-connected system provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the schematic flow sheet of an embodiment of offshore wind turbine combination method provided by the invention, as shown in Figure 1, comprises step:
Wind resource change is, after alternating current, be elevated to suitable voltage, and be linked into ac bus through step-up transformer by S101, offshore wind turbine.
Wherein, described offshore wind turbine is specially direct-driving permanent-magnetic wind-driven.Direct-driving permanent-magnetic wind-driven group is relative to traditional asynchronous generating unit, and its advantage is: due to the minimizing of drivetrain components, improves the reliability of unit, reduces noise; The employing of permanent magnet generator technology and variable speed constant frequency technology, improves the efficiency of wind turbine generator; Utilize variable speed constant frequency technology, can reactive power compensation be carried out.
The current transformer of direct-driving permanent-magnetic wind-driven group can adopt the scheme of uncontrollable rectification+Boost+ inversion.The principle of the program is: the alternating current of frequency low-speed direct driving type permanent-magnetic wind driven generator group sent, amplitude change becomes direct current after over commutation, after Boost circuit boosting, then be transformed to three-phase constant width alternating current through three-phase inverter and be connected to electrical network.By intervening power electronics transform part, can control the active power of wind turbine generator and reactive power, thus maximal efficiency utilize wind energy.The input side of Boost circuit has energy storage inductor, can reduce input current ripple; Outlet side has filter capacitor, can reduce output voltage ripple; Therefore utilize Boost circuit while copped wave, also achieve the effect of power factor correction.When wind speed changes, the voltage that uncontrollable rectification obtains also in change, and by the adjustment of Boost circuit, can keep the stable of DC voltage, makes output voltage keep constant.The rectifier that uncontrollable rectification+Boost+ inverter circuit is formed, controls simple, and implement relatively easy, reliability is high, and the control to magneto alternator when can be implemented in Speedless sensor, has saved cost.
S102, ac bus collect the alternating current after the boosting of described step-up transformer.
The convert alternating current that described ac bus collects is direct current by S103, marine current conversion station.
Direct current after described marine current conversion station conversion is carried out long-distance transmissions by S104, submarine cable.
The DC power conversion that described submarine cable transmits by S105, land current conversion station is alternating current.
S106, by main transformer, the alternating current of described land current conversion station conversion is converted to suitable electric pressure, and becomes owner of electrical network.
Fig. 2 is the system connection layout of an embodiment of offshore wind turbine grid-connected system provided by the invention, as shown in Figure 2, comprising:
Offshore wind turbine, for being alternating current by Wind resource change; Wherein, described offshore wind turbine is specially direct-driving permanent-magnetic wind-driven;
Step-up transformer, correspondingly with offshore wind turbine connects one by one, and the alternating current for being changed by the offshore wind turbine of correspondence is elevated to suitable voltage;
Ac bus, connects described step-up transformer, for collecting the alternating current after the boosting of described step-up transformer;
Marine current conversion station, be connected with described ac bus, the convert alternating current for will ac bus collect is direct current;
Submarine cable, is connected with described marine current conversion station, for the direct current after described marine current conversion station conversion is carried out long-distance transmissions;
Land current conversion station, is connected with described submarine cable, for being alternating current by the DC power conversion of transmission;
Main transformer, is connected with described land current conversion station, for the alternating current of described land current conversion station conversion is converted to suitable electric pressure, and becomes owner of electrical network.
Implement the present invention, there is following beneficial effect:
1, when carrying equal-wattage, direct current transportation number of cables used is few, and circuit cost is low;
2, direct current transportation number of conductors is few, and its active loss is less;
3, direct current cables is in operation, and only has the resistance loss on heart yearn, does not have magnetic induction loss, therefore insulate aging slower than ac cable a lot, useful life is also corresponding longer than ac cable a lot, is suitable for laying down on sea bottom;
4, direct current transportation is without stationary problem, reliable, not existence and stability problem, and therefore its transmission distance is unrestricted, is suitable for the marine wind electric field that offshore is far away;
5, direct current transportation can regulate active power easily and quickly by converter and realize trend upset, and governing speed is fast.
6, can isolate the impact between the AC network fault of two ends, power direction is easy to control.
It should be noted that, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or device and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or device.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the device comprising this key element and also there is other identical element.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
In several embodiments that the application provides, should be understood that, disclosed system and method can realize by another way.Such as, system embodiment described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical, machinery or other form.
Professional can also recognize further, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with electronic hardware, computer software or the combination of the two, in order to the interchangeability of hardware and software is clearly described, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (4)
1. an offshore wind turbine combination method, is characterized in that, comprising:
Wind resource change is, after alternating current, be elevated to suitable voltage, and be linked into ac bus through step-up transformer by offshore wind turbine;
Ac bus collects the alternating current after the boosting of described step-up transformer;
The convert alternating current that described ac bus collects is direct current by marine current conversion station;
Direct current after described marine current conversion station conversion is carried out long-distance transmissions by submarine cable;
The DC power conversion that described submarine cable transmits by land current conversion station is alternating current;
By main transformer, the alternating current of described land current conversion station conversion is converted to suitable electric pressure, and becomes owner of electrical network.
2. offshore wind turbine combination method as claimed in claim 1, it is characterized in that, described offshore wind turbine is specially direct-driving permanent-magnetic wind-driven.
3. an offshore wind turbine grid-connected system, is characterized in that, comprising:
Offshore wind turbine, for being alternating current by Wind resource change;
Step-up transformer, correspondingly with offshore wind turbine connects one by one, and the alternating current for being changed by the offshore wind turbine of correspondence is elevated to suitable voltage;
Ac bus, connects described step-up transformer, for collecting the alternating current after the boosting of described step-up transformer;
Marine current conversion station, be connected with described ac bus, the convert alternating current for will ac bus collect is direct current;
Submarine cable, is connected with described marine current conversion station, for the direct current after described marine current conversion station conversion is carried out long-distance transmissions;
Land current conversion station, is connected with described submarine cable, for being alternating current by the DC power conversion of transmission;
Main transformer, is connected with described land current conversion station, for the alternating current of described land current conversion station conversion is converted to suitable electric pressure, and becomes owner of electrical network.
4. offshore wind turbine combination method as claimed in claim 3, it is characterized in that, described offshore wind turbine is specially direct-driving permanent-magnetic wind-driven.
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| CN201510593123.5A CN105207257A (en) | 2015-09-17 | 2015-09-17 | Offshore wind turbine grid connection method and system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374519A (en) * | 2016-11-21 | 2017-02-01 | 南京工程学院 | Offshore wind-farm power transmission method based on superconductive DC cable |
| CN106992536A (en) * | 2017-03-22 | 2017-07-28 | 全球能源互联网研究院 | A kind of main electrical scheme system of marine wind electric field flexible direct current power transmission system |
| CN107634543A (en) * | 2017-11-21 | 2018-01-26 | 国网上海市电力公司 | A kind of offshore wind farm booster system and step-up method |
| CN107895963A (en) * | 2017-11-27 | 2018-04-10 | 中国西电电气股份有限公司 | A kind of soft straight current conversion station topological structure of marine wind electric field and its grid-connected system |
| CN108258727A (en) * | 2018-01-24 | 2018-07-06 | 许继集团有限公司 | A kind of offshore grid-connected wind farm transmission system |
| CN108270234A (en) * | 2016-12-30 | 2018-07-10 | 中国电力科学研究院 | A kind of off-lying sea wind-electricity integration system and method based on uncontrollable rectifier device |
| CN109510246A (en) * | 2019-01-07 | 2019-03-22 | 南京南瑞继保电气有限公司 | A kind of offshore wind farm direct current grid-connected system |
| CN111030065A (en) * | 2019-12-10 | 2020-04-17 | 平高集团有限公司 | Fault protection area setting method for multi-terminal offshore direct current wind power plant system |
| CN112600224A (en) * | 2020-12-08 | 2021-04-02 | 华北电力大学 | LC filtering device and method for offshore flexible direct current transmission system |
| CN113541178A (en) * | 2020-04-22 | 2021-10-22 | 国网江苏省电力有限公司 | Offshore wind farm grid-connected system |
| CN115719969A (en) * | 2022-11-29 | 2023-02-28 | 中国华能集团清洁能源技术研究院有限公司 | Offshore wind power direct current system |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107895963A (en) * | 2017-11-27 | 2018-04-10 | 中国西电电气股份有限公司 | A kind of soft straight current conversion station topological structure of marine wind electric field and its grid-connected system |
| CN108258727A (en) * | 2018-01-24 | 2018-07-06 | 许继集团有限公司 | A kind of offshore grid-connected wind farm transmission system |
| CN109510246A (en) * | 2019-01-07 | 2019-03-22 | 南京南瑞继保电气有限公司 | A kind of offshore wind farm direct current grid-connected system |
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| CN111030065A (en) * | 2019-12-10 | 2020-04-17 | 平高集团有限公司 | Fault protection area setting method for multi-terminal offshore direct current wind power plant system |
| CN113541178A (en) * | 2020-04-22 | 2021-10-22 | 国网江苏省电力有限公司 | Offshore wind farm grid-connected system |
| CN113541178B (en) * | 2020-04-22 | 2023-12-29 | 国网江苏省电力有限公司 | Offshore wind farm grid-connected system |
| CN112600224A (en) * | 2020-12-08 | 2021-04-02 | 华北电力大学 | LC filtering device and method for offshore flexible direct current transmission system |
| CN112600224B (en) * | 2020-12-08 | 2022-09-30 | 华北电力大学 | LC filtering device and method for offshore flexible direct current transmission system |
| CN115719969A (en) * | 2022-11-29 | 2023-02-28 | 中国华能集团清洁能源技术研究院有限公司 | Offshore wind power direct current system |
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