CN111030171A - Multi-end offshore direct current wind power plant system - Google Patents
Multi-end offshore direct current wind power plant system Download PDFInfo
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- CN111030171A CN111030171A CN201911261604.0A CN201911261604A CN111030171A CN 111030171 A CN111030171 A CN 111030171A CN 201911261604 A CN201911261604 A CN 201911261604A CN 111030171 A CN111030171 A CN 111030171A
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Abstract
The invention provides a multi-end offshore direct current wind power plant system, which comprises a three-layer structure: the system comprises a basic power generation layer, a first boosting layer and a second boosting layer, wherein the basic power generation layer consists of a wind power generation unit and an alternating current-direct current converter connected with the power generation unit; the first boosting layer is composed of a direct current transformer; the second booster layer is formed by an offshore converter station; the alternating current-direct current converter is connected to a corresponding direct current transformer in the first boosting layer; and the direct current transformer in the second layer is connected to the offshore converter station in the second boosting layer. The multi-end offshore direct current wind power station provides a solution for large-scale wind power station construction, and the direct current is used for offshore wind power collection, so that the cable loss in the wind power station is reduced, and the electric energy is prevented from being rectified, inverted and boosted for multiple times, so that the system investment is reduced, and the load of an offshore platform is reduced.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a multi-terminal offshore direct-current wind power plant system.
Background
Wind energy has great development potential as a new energy source which is pollution-free and renewable. The offshore wind power plant gradually becomes a new trend of wind power development due to the advantages of stable wind speed, no land resource occupation, no environmental influence basically and the like. Offshore wind power is receiving attention as the latest technology of global wind power, and is a new technology which is most likely to reduce the cost of wind power generation in the future. With the increase of installed capacity and transmission distance of offshore wind power plants, the application of the high-voltage direct-current transmission technology in offshore wind power grid connection becomes wider and wider.
Alternating current collection is combined with flexible direct current transmission, and the flexible direct current transmission system has the advantages of stability, flexibility in control and the like of alternating current transmission and flexible direct current transmission, and has technical feasibility and realizability. But also has significant drawbacks. The large offshore converter platform needs to be built, a large-capacity transformer, a converter and accessory equipment thereof need to be placed, the manufacturing cost is high, and the construction difficulty is high. The serial direct current transmission scheme can omit a huge offshore converter platform, reduce cost and construction difficulty, but the control protection strategy is complex, a fan transformer needs to bear the insulation voltage grade of high-voltage direct current, the manufacturing difficulty is increased, no actual engineering exists at present, and related technical bottlenecks need to be broken through.
The direct current collection is combined with direct current transmission, and the direct current collection type wind power station has the advantages that direct current can be obtained in an offshore wind farm, the advantages of a direct current cable can be fully exerted, meanwhile, a power electronic converter with full high power density can be adopted, a heavy power frequency transformer is not needed, and higher power density can be achieved. Therefore, the wind power plant energy collection and transmission adopts a direct-current full-direct-current offshore wind power plant to represent the long-term development trend of offshore wind power.
Disclosure of Invention
Aiming at the problem that no ideal design scheme of a multi-terminal offshore direct current wind power plant system exists in the prior art, the invention provides the multi-terminal offshore direct current wind power plant system.
The invention provides a multi-end offshore direct current wind power station system which comprises a three-layer structure: a base electricity-generating layer, a first booster layer and a second booster layer,
wherein the content of the first and second substances,
the foundation power generation layer is composed of one or more wind power generation units and an alternating current-direct current converter connected with the wind power generation units;
the first boosting layer is composed of one or more direct current transformers;
the second pressure rising layer is composed of an offshore converter station, and the offshore converter station is one or more stations;
the alternating current-direct current converter is connected to a corresponding direct current transformer in the first boosting layer;
and the direct current transformer in the first booster layer is connected to the corresponding offshore converter station in the second booster layer.
Furthermore, the wind power generation unit is composed of one or more wind power generation sets connected in series or in parallel.
Further, the AC-DC converter is connected with the corresponding DC transformer through a DC cable.
Furthermore, part or all of the direct current transformers in the plurality of direct current transformers form one or a plurality of direct current transformer combinations with input, parallel and output connected in series.
Further, in the dc transformer assembly, a first dc transformer to a last dc transformer are connected in series via a dc cable in sequence, and the first and the last dc transformers are connected to the offshore converter station via a dc breaker via a dc cable.
Further, when one direct current transformer combination is used, the direct current transformer combination is connected to the offshore converter station through a direct current cable and a direct current breaker;
when the direct current transformer combination is multiple, the multiple direct current transformer combinations are respectively connected to the offshore converter station through the direct current circuit breakers and then converged to one direct current cable, and then the direct current circuit breakers.
Further, when the number of the direct current transformers is one, the direct current transformers are connected to the offshore converter station through direct current cables and a direct current breaker.
Further, when a plurality of direct current transformers are not combined, and when one direct current transformer is not combined, the direct current cable of the direct current transformer is connected to the offshore converter station through a direct current breaker;
when the direct current transformers are not combined, and when the direct current transformers are not combined, the direct current transformers are connected to the offshore converter station through direct current cables connected with the direct current transformers respectively through a direct current breaker.
Furthermore, each offshore converter station is composed of one or more high-voltage direct-current transformers connected in series or in parallel.
Further, when the offshore converter station is a station, the offshore converter station is connected to the onshore converter station through a direct current cable and two direct current breakers;
when the offshore converter stations are multiple stations, the first offshore converter station and the last offshore converter station are sequentially connected in series, and two adjacent offshore converter stations are connected through two direct current breakers through direct current cables; the first station and the last station offshore converter station are connected to the onshore converter station through two direct current breakers through direct current cables; and each offshore converter station is connected with the onshore converter station to form an annular direct current power grid.
Further, when the offshore converter station is a plurality of stations,
when the direct current transformer or/and the direct current transformer combination formed by the direct current transformer is/are multiple, the direct current transformer or/and the direct current transformer combination are/is respectively connected to the same or different offshore converter stations.
The multi-end offshore direct current wind power station provides a solution for large-scale wind power station construction, the offshore wind power is collected by utilizing direct current, so that the cable loss in the wind power station is reduced, and the electric energy is prevented from being rectified, inverted and boosted for multiple times, so that the system investment is reduced, the original reactive voltage problem in the wind power station is solved while the advantages of lower loss, larger transmission capacity and more material saving are obtained, a heavy power frequency transformer and redundant power transformation links are omitted, and the load of an offshore platform is reduced. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 shows a multi-terminal offshore direct current wind farm system diagram of a two-stage boost structure according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present application, the plurality refers to more than one, and similarly, the plurality and the plurality refer to more than one and more than one, respectively.
The invention provides a multi-end offshore direct current wind power plant system with a two-stage boosting structure, which is shown in figure 1. In fig. 1, 1 is a wind power generation unit, 2 is an ac/dc converter, 3 is a medium voltage dc transformer, 4 is a high voltage dc transformer, and 5 is a modular multilevel converter.
As shown in fig. 1, the multi-terminal offshore direct current wind farm system of the present invention includes a three-layer structure, where the first layer structure is a basic power generation layer formed by a wind power generation unit 1 and a corresponding ac/dc converter 2, the second layer structure is a first boost layer formed by a medium voltage direct current transformer 3 or a medium voltage direct current transformer assembly IPOS connected in parallel and in series, and the third layer is an offshore converter station layer formed by a high voltage direct current transformer, i.e., a second boost layer. The second boost layer is connected via a high voltage direct current cable HVDC to an onshore converter station constituted by a modular multilevel converter 5, which is connected to the alternating current grid via an onshore transformer.
Wherein the content of the first and second substances,
each wind power generation unit 1 is composed of one or more wind power generation sets connected in series or in parallel, each wind power generation unit 1 is connected to a corresponding alternating current-direct current converter 2, and the alternating current-direct current converters 2 are connected with corresponding medium-voltage direct current transformers 3 through direct current cables. The number of the wind power generation units 1 may be one or more, and thus, one or more medium voltage dc transformers 3 are correspondingly connected to the wind power generation units 1. When there are multiple medium voltage dc transformers 3, some or all of the medium voltage dc transformers 3 in the multiple medium voltage dc transformers 3 constitute one or more medium voltage dc transformer combinations IPOS with input connected in parallel and output connected in series. In the medium-voltage direct-current transformer combination IPOS, a first medium-voltage direct-current transformer 3 to a last medium-voltage direct-current transformer 3 are sequentially connected in series through direct-current cables, and the head and the tail of the two medium-voltage direct-current transformers 3 are connected to an offshore converter station through a medium-voltage direct-current cable MVDC and a direct-current breaker DCCB.
The number of the medium-voltage direct-current transformer combinations IPOS or/and the medium-voltage direct-current transformers 3 which are connected to the same offshore converter station through the medium-voltage direct-current cables MVDC can be multiple or one, wherein when the number of the medium-voltage direct-current transformer combinations IPOS is one, the medium-voltage direct-current transformer combinations IPOS is directly connected to the offshore converter station through the medium-voltage direct-current cables MVDC through the direct-current circuit breakers DCCB; when a plurality of medium voltage direct current transformer combinations IPOS are provided, all medium voltage direct current cables MVDC connected with all the medium voltage direct current transformer combinations IPOS are converged to one medium voltage direct current cable MVDC through a direct current breaker DCCB and then are connected to the offshore converter station through one direct current breaker DCCB.
When one wind power generation unit 1 is provided, one corresponding medium-voltage direct-current transformer 3 is provided, and the medium-voltage direct-current transformer 3 is directly connected to the offshore converter station through a medium-voltage direct-current cable MVDC via a direct-current breaker DCCB. When the number of the medium-voltage direct-current transformers 3 is multiple but not all of the medium-voltage direct-current transformer combinations IPOS and the number of the medium-voltage direct-current transformers 3 which do not form the medium-voltage direct-current transformer combinations IPOS is one, the direct-current cable connected with the medium-voltage direct-current transformers 3 is connected to the offshore converter station through a direct-current breaker; when the number of the medium-voltage direct-current transformers 3 is multiple but not all of the medium-voltage direct-current transformer combinations IPOS, and when the number of the medium-voltage direct-current transformers 3 not forming the medium-voltage direct-current transformer combinations IPOS is multiple, the medium-voltage direct-current transformers 3 are respectively connected to the offshore converter station through a direct-current breaker by respective connected direct-current cables.
The offshore converter station is composed of one or more high-voltage direct-current transformers connected in series or in parallel. The offshore converter station can be one place or a plurality of places. When the number of the medium voltage direct current transformers 3 or/and the medium voltage direct current transformer combinations IPOS is multiple, the medium voltage direct current transformers 3 or/and the medium voltage direct current transformer combinations IPOS are respectively connected to the same or different offshore converter stations, as can be seen from fig. 1, the different medium voltage direct current transformer combinations IPOS are respectively connected to the offshore converter station 1 and the offshore converter station 2.
When the offshore converter stations are multiple stations, the first offshore converter station and the last offshore converter station are sequentially connected in series, two adjacent offshore converter stations are connected through direct current cables and two direct current circuit breakers DCCB, the first offshore converter station and the last offshore converter station are connected to the onshore converter station through high voltage direct current cables HVDC and two direct current circuit breakers DCCB, and each offshore converter station and the onshore converter station form an annular direct current power grid. When the offshore converter station is a station, the offshore converter station is connected to the onshore converter station through the high-voltage direct current cable HVDC through the two direct current circuit breakers DCCB. The offshore converter station is composed of one or more high-voltage direct-current transformers 4 connected in series or in parallel.
In summary, the multi-terminal offshore direct current wind farm system with the two-stage boost structure of the invention comprises a three-layer structure:
the first layer is a basic power generation layer, the basic power generation layer generates alternating current through an offshore wind generating set and converts the alternating current into direct current electric energy, and then the direct current electric energy is sent to the second layer;
the second layer is a first boosting layer, the first boosting layer is composed of a medium-voltage direct-current transformer 3 or a medium-voltage direct-current transformer combination IPOS (IPOS) with input, parallel and output connected in series, the first boosting layer performs first boosting on the direct-current electric energy sent by the basic power generation layer, and then sends the boosted direct-current electric energy to the third layer;
the third layer is a second boosting layer, the second boosting layer is composed of one or more offshore converter stations, the second boosting layer boosts the direct current electric energy sent by the first boosting layer, namely boosts the direct current electric energy for the second time, then sends the direct current electric energy boosted for the second time to a shore converter, and supplies power to an alternating current power grid through an onshore transformer.
Each direct current circuit breaker DCCB is used for realizing fault isolation and fault protection of the multi-terminal offshore direct current wind power plant system; the direct current transformer of the invention needs to meet the following technical requirements: high voltage, high capacity, high voltage gain, high reliability, fault isolation, redundant operation, etc., wherein the medium voltage dc transformer 3 is preferably a dual active full bridge (DAB) type dc transformer, and the high voltage dc transformer 4 is preferably an isolated Modular Multilevel Converter (MMC) type dc transformer. The medium-voltage direct-current transformer combined IPOS is preferably of a multiple modular structure which takes a DAB type direct-current transformer as a basic unit for input and output series-parallel connection.
In the multi-end offshore direct current wind power plant system, the direct current cable is adopted in the wind power plant, and in addition, the direct current converter is directly connected to the fan side, so that the cable loss in the wind power plant is reduced, the advantages of lower loss, larger transmission capacity and more material saving are obtained, and the problem of the original reactive voltage in the wind power plant is solved. The multi-end offshore direct current wind power station does not need a heavy power frequency alternating current transformer, redundant power transformation links are omitted, and the DC/DC converter which is lighter in weight and higher in power density is used for boosting, so that the multi-end offshore direct current wind power station is superior to the existing offshore alternating current wind power station in the aspects of the size, the weight, the system loss, the construction cost and the like of equipment, and the load of an offshore platform is reduced.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A multi-terminal offshore direct current wind farm system, characterized in that the system comprises a three-layer structure: a base electricity-generating layer, a first booster layer and a second booster layer,
wherein the content of the first and second substances,
the foundation power generation layer is composed of one or more wind power generation units and an alternating current-direct current converter connected with the wind power generation units;
the first boosting layer is composed of one or more direct current transformers;
the second pressure rising layer is composed of an offshore converter station, and the offshore converter station is one or more stations;
the alternating current-direct current converter is connected to a corresponding direct current transformer in the first boosting layer;
and the direct current transformer in the first booster layer is connected to the corresponding offshore converter station in the second booster layer.
2. The multi-terminal offshore direct current wind farm system according to claim 1,
the wind power generation unit is composed of one or more wind power generation sets connected in series or in parallel.
3. The multi-terminal offshore direct current wind farm system according to claim 1,
the alternating current-direct current converters are connected with the corresponding direct current transformers through direct current cables.
4. The multi-terminal offshore direct current wind farm system according to claim 1,
and part or all of the direct current transformers in the plurality of direct current transformers form one or more direct current transformer combinations with input connected in parallel and output connected in series.
5. The multi-terminal offshore direct current wind farm system according to claim 4,
in the direct current transformer combination, a first direct current transformer to a last direct current transformer are sequentially connected in series through a direct current cable, and the first direct current transformer and the last direct current transformer are connected to the offshore converter station through a direct current cable and a direct current breaker.
6. Multi-terminal offshore direct current wind park system according to claim 4 or 5,
when the direct current transformer combination is one, the direct current transformer combination is connected to the offshore converter station through a direct current cable and a direct current breaker;
when the direct current transformer combination is multiple, the multiple direct current transformer combinations are respectively connected to the offshore converter station through the direct current circuit breakers and then converged to one direct current cable, and then the direct current circuit breakers.
7. The multi-terminal offshore direct current wind farm system according to claim 1,
and when one direct current transformer is adopted, the direct current transformer is connected to the offshore converter station through a direct current cable and a direct current breaker.
8. Multi-terminal offshore direct current wind park system according to claim 4 or 5,
when the direct current transformers are combined and the direct current transformers which do not form the direct current transformer combination are one, the direct current cables of the direct current transformers are connected to the offshore converter station through a direct current breaker;
when the direct current transformers are not combined, and when the direct current transformers are not combined, the direct current transformers are connected to the offshore converter station through direct current cables connected with the direct current transformers respectively through a direct current breaker.
9. The multi-terminal offshore direct current wind farm system according to claim 1,
each offshore converter station consists of one or more high-voltage direct-current transformers connected in series or in parallel.
10. Multi-terminal offshore direct current wind park system according to claim 1 or 9,
when the offshore converter station is a station, the offshore converter station is connected to the onshore converter station through a direct current cable and two direct current breakers;
when the offshore converter stations are multiple stations, the first offshore converter station and the last offshore converter station are sequentially connected in series, and two adjacent offshore converter stations are connected through two direct current breakers through direct current cables; the first station and the last station offshore converter station are connected to the onshore converter station through two direct current breakers through direct current cables; and each offshore converter station is connected with the onshore converter station to form an annular direct current power grid.
11. Multi-terminal offshore direct current wind park system according to claim 1 or 9,
when the number of offshore converter stations is large,
when the direct current transformer or/and the direct current transformer combination formed by the direct current transformer is/are multiple, the direct current transformer or/and the direct current transformer combination are/is respectively connected to the same or different offshore converter stations.
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| CN201911261604.0A CN111030171A (en) | 2019-12-10 | 2019-12-10 | Multi-end offshore direct current wind power plant system |
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| CN201911261604.0A CN111030171A (en) | 2019-12-10 | 2019-12-10 | Multi-end offshore direct current wind power plant system |
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Cited By (2)
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| CN113285478A (en) * | 2021-05-26 | 2021-08-20 | 南方电网科学研究院有限责任公司 | Control method and device of series multi-terminal direct current system suitable for offshore wind farm |
| WO2023035407A1 (en) * | 2021-09-07 | 2023-03-16 | 中电普瑞电力工程有限公司 | Offshore wind power system based on series-type hybrid converter, and start control method therefor |
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| WO2023035407A1 (en) * | 2021-09-07 | 2023-03-16 | 中电普瑞电力工程有限公司 | Offshore wind power system based on series-type hybrid converter, and start control method therefor |
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Application publication date: 20200417 |