CN113364025A - Wind power generation unit, offshore transmitting end converter station, power transmission system and power transmission method - Google Patents
Wind power generation unit, offshore transmitting end converter station, power transmission system and power transmission method Download PDFInfo
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- CN113364025A CN113364025A CN202110898921.4A CN202110898921A CN113364025A CN 113364025 A CN113364025 A CN 113364025A CN 202110898921 A CN202110898921 A CN 202110898921A CN 113364025 A CN113364025 A CN 113364025A
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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
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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
- H02J3/381—Dispersed generators
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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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- 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]
Abstract
The invention discloses a wind power generation unit, an offshore sending end converter station, a power transmission system and a power transmission method, wherein the wind power generation unit comprises a wind power generator, a three-phase rectifier and a DC-DC converter, the output end of the wind power generator is connected with the input end of the alternating current side of the three-phase rectifier, and the output end of the direct current side of the three-phase rectifier is connected with the input end of the DC-DC converter; the wind driven generator is used for converting offshore wind energy into alternating current electric energy; the three-phase rectifier is used for converting the alternating current electric energy converted by the wind driven generator into direct current electric energy; the DC-DC converter is used for converting the direct current electric energy converted by the three-phase rectifier into variable direct current electric energy; and setting the direct-current side output end of the three-phase rectifier as a first output port of the wind power generation unit, and setting the output end of the DC-DC converter as a second output port of the wind power generation unit. And the construction cost of the offshore wind power plant is saved.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to a wind power generation unit, an offshore transmitting end converter station, a power transmission system and a power transmission method.
Background
An offshore wind farm usually comprises more than one hundred wind turbine generators, and the electric energy of the wind turbine generators needs to be transmitted to a land transformer substation through a submarine cable for grid-connected power generation. Common offshore wind power transmission forms include high voltage alternating current transmission and high voltage direct current transmission. High-voltage alternating-current power transmission is commonly used for offshore wind power plants, and offshore wind power plants are commonly used for transmitting offshore wind power in a high-voltage direct-current power transmission mode. Aiming at the field of offshore wind power high-voltage direct-current transmission, in order to realize centralized delivery of electric energy of a plurality of distributed offshore wind power generation sets, the electric energy of the plurality of offshore wind power generation sets needs to be collected, the collected electric energy is boosted through a centralized booster station and is transmitted to a land inverter station, and then grid-connected power generation is realized.
The prior art discloses a converter station and a system combining an offshore wind power booster station and a flexible direct current converter valve, wherein the combined converter station comprises a flexible direct current transformer, a flexible direct current converter valve set and a valve set bypass switch; the output ends of the plurality of wind power plants are converged in a bus bar; the primary side of the flexible direct current transformer is used for being connected to a bus bar, the secondary side of the flexible direct current converter valve group is connected with the input end of the flexible direct current converter valve group, and a valve group bypass switch is connected beside the output end of the flexible direct current converter valve group. By means of the method, the concentrated converter stations are distributed in the booster stations, the limitation of the voltage level and the capacity of offshore wind power output due to the difficulty of large-scale transportation, construction and operation and maintenance of the offshore converter stations is avoided, one wind power plant corresponds to one co-constructed converter station, and the corresponding booster stations are still required to be matched with each other, so that the distributed offshore wind power is subjected to centralized energy conversion, and the construction cost of the offshore wind power plant is increased.
Disclosure of Invention
Aiming at the problems, the invention provides a wind power generation unit, an offshore transmitting end converter station, a power transmission system and a power transmission method for saving the construction cost of an offshore wind farm.
The technical scheme of the invention is as follows: a wind power generation unit comprises a wind power generator, a three-phase rectifier and a DC-DC converter, wherein the output end of the wind power generator is connected with the input end of the alternating current side of the three-phase rectifier, and the output end of the direct current side of the three-phase rectifier is connected with the input end of the DC-DC converter; the wind driven generator is used for converting offshore wind energy into alternating current electric energy; the three-phase rectifier is used for converting the alternating current electric energy converted by the wind driven generator into direct current electric energy; the DC-DC converter is used for converting the direct current electric energy converted by the three-phase rectifier into variable direct current electric energy; and setting the direct-current side output end of the three-phase rectifier as a first output port of the wind power generation unit, and setting the output end of the DC-DC converter as a second output port of the wind power generation unit.
The working principle of the technical scheme is as follows:
a wind driven generator, a three-phase rectifier and a DC-DC converter are matched with each other to control a wind power generation unit, so that the wind driven generator converts offshore wind energy into alternating current energy, the three-phase rectifier converts the alternating current energy converted by the wind driven generator into direct current energy, and the DC-DC converter converts the direct current energy converted by the three-phase rectifier into variable direct current energy (variable direct current energy can be determined according to actual offshore environment and power generation requirements) to form a brand new wind power generation unit. In the conventional offshore wind farm design, because of the booster station, in the process of forming wind power generation, only a wind power generator converts offshore wind energy into alternating current power, then the alternating current power converted by the wind power generator is converted into direct current power by a three-phase rectifier, and finally the direct current power converted by the three-phase rectifier is converted into variable alternating current power by an inverter. Therefore, under the traditional concept of engineering application, the situation that a wind power generation unit is formed by matching a generator, a three-phase rectifier and a DC-DC converter in the design of an offshore wind farm can be avoided.
In order to solve the technical problem, a distributed offshore transmitting end converter station is provided, which comprises a plurality of wind power generation units, wherein the positive electrode and the negative electrode of the first output port of each wind power generation unit are connected in parallel to a parallel direct current bus and are used for collecting direct current energy of the wind power generation units; the second output ports of the wind power generation units are sequentially arranged, and the second output ports of any two adjacent wind power generation units are connected in cascade and used for boosting the voltage of the plurality of wind power generation units; and setting the anode of the second output port in the first wind power generation unit arranged in sequence as the power transmission anode of the direct current side of the distributed offshore sending end converter station, and setting the cathode of the second output port in the last wind power generation unit as the power transmission cathode of the direct current side of the distributed offshore sending end converter station.
A plurality of wind power generation units are designed to form a distributed offshore sending end converter station, and the function of the traditional booster station is replaced, so that the cost of building the booster station in the construction of an offshore wind farm is saved.
In order to solve the technical problem, an offshore wind power transmission system is provided, which includes the above-mentioned distributed offshore transmitting end converter station and onshore receiving end converter station, wherein a power transmission positive electrode on the direct current side of the distributed offshore transmitting end converter station is connected with a positive electrode on the direct current side of the onshore receiving end converter station, and a power transmission negative electrode on the direct current side of the distributed offshore transmitting end converter station is connected with a negative electrode on the direct current side of the onshore receiving end converter station.
In order to solve the technical problem, a power transmission method for controlling the offshore wind power transmission system is provided, and the method comprises the following steps:
controlling a wind power generation unit to enable a wind power generator to convert offshore wind energy into alternating current electric energy, enable a three-phase rectifier to convert the alternating current electric energy converted by the wind power generator into direct current electric energy, and enable a DC-DC converter to convert the direct current electric energy converted by the three-phase rectifier into variable direct current electric energy;
controlling the direct current electric energy of the wind power generation units to be boosted and collected to a distributed offshore sending end converter station;
and controlling the direct current electric energy of the distributed offshore sending end converter station to be transmitted to an onshore receiving end converter station.
The invention has the beneficial effects that:
1. the invention adopts the mutual cooperation of the wind driven generator, the three-phase rectifier and the DC-DC converter to control the wind power generation unit, so that the wind driven generator converts offshore wind energy into alternating current electric energy, the three-phase rectifier converts the alternating current electric energy formed by the conversion of the wind driven generator into direct current electric energy, and the DC-DC converter converts the direct current electric energy formed by the conversion of the three-phase rectifier into variable direct current electric energy (variable direct current electric energy which can be determined according to the actual offshore environment and the power generation requirement) to form a brand new wind power generation unit. In the conventional offshore wind farm design, because of the booster station, in the process of forming wind power generation, only a wind power generator converts offshore wind energy into alternating current power, then the alternating current power converted by the wind power generator is converted into direct current power by a three-phase rectifier, and finally the direct current power converted by the three-phase rectifier is converted into variable alternating current power by a DC-AC converter. Therefore, under the traditional concept of engineering application, the situation that a wind power generation unit is formed by matching a generator, a three-phase rectifier and a DC-DC converter in the design of an offshore wind farm can be avoided.
2. According to the invention, a distributed offshore sending end converter station is formed by designing a plurality of wind power generation units, and the function of the traditional booster station is replaced, so that the cost of building the booster station in the construction of an offshore wind farm is saved.
Drawings
FIG. 1 is an overall circuit diagram of a wind power generation unit according to embodiment 1 of the present invention;
fig. 2 is an overall circuit diagram of a distributed marine send-end converter station according to embodiment 2 of the present invention;
fig. 3 is an overall circuit diagram of an offshore wind power transmission system according to embodiment 3 of the present invention.
Description of reference numerals:
10-a wind power generator; 20-a three-phase rectifier; 30-DC converter; 40 — a first output port; 50 — a second output port; 60-parallel direct current bus; 70-a wind power generation unit; 80-an offshore send-end converter station; 90-a power transmission anode on the direct current side of the offshore send-end converter station; 100-a power transmission negative electrode on the direct current side of the offshore send-end converter station; 200-onshore receiving end converter station, 300-power grid.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, a wind power generation unit includes a wind power generator 10, a three-phase rectifier 20 and a DC-DC converter 30, wherein an output terminal of the wind power generator 10 is connected to an input terminal of the three-phase rectifier 20 on an ac side, and an output terminal of the three-phase rectifier 20 on a DC side is connected to an input terminal of the DC-DC converter 30; the wind power generator 10 is used for converting offshore wind energy into alternating current power; the three-phase rectifier 20 is used for converting the alternating current electric energy converted by the wind driven generator 10 into direct current electric energy; the DC-DC converter 30 is used for converting the DC power converted by the three-phase rectifier 20 into a variable DC power; the output terminal of the three-phase rectifier 20 on the DC side is set as the first output port 40 of the wind power generation unit 70, and the output terminal of the DC-DC converter 30 is set as the second output port 50 of the wind power generation unit 70.
The working principle of the technical scheme is as follows:
the wind power generator 10, the three-phase rectifier 20 and the DC-DC converter 30 are matched with each other to control the wind power generation unit 70, so that the wind power generator 10 converts offshore wind energy into alternating current electric energy, the three-phase rectifier 20 converts the alternating current electric energy converted by the wind power generator 10 into direct current electric energy, and the DC-DC converter 30 converts the direct current electric energy converted by the three-phase rectifier 20 into variable direct current electric energy (variable direct current electric energy can be determined according to actual offshore environment and power generation requirements), thereby forming a brand new wind power generation unit 70 and saving construction cost of an offshore wind farm. In the conventional offshore wind farm design, because of the booster station, during the process of generating wind power, the conventional method is only to convert the offshore wind energy into AC power by the wind power generator 10, then convert the AC power converted by the wind power generator 10 into DC power by the three-phase rectifier 20, and finally convert the DC power converted by the three-phase rectifier 20 into variable AC power by the DC-AC converter. Therefore, under the traditional concept of engineering application, the situation that the wind power generation unit 70 is formed by matching the generator, the three-phase rectifier 20 and the DC-DC converter 30 in the design of the offshore wind farm does not exist.
Example 2:
as shown in fig. 2, in order to solve the above technical problem, a distributed offshore transmission end converter station is provided, which includes a plurality of wind power generation units 70 described in embodiment 1, wherein a positive electrode and a negative electrode of a first output port 40 of each wind power generation unit 70 are connected in parallel to a parallel dc bus 60, and are used for collecting dc power of the plurality of wind power generation units 70; the second output ports 50 of the wind power generation units 70 are sequentially arranged (when the second output port 50 of one of the wind power generation units 70 is cascade-connected to the second output port 50 of one of the wind power generation units 70 of all other wind power generation units 70, the second output port 50 of the one of the wind power generation units 70 is not cascade-connected to the second output ports 50 of the other wind power generation units 70 except the one of the wind power generation units 70 which is cascade-connected thereto, for example, there are six wind power generation units 70, which are sequentially arranged to form the first wind power generation unit 70 to the sixth wind power generation unit 70, respectively, and when the second output port 50 of the first wind power generation unit 70 is cascade-connected to the second output port 50 of the second wind power generation unit 70, the second output port 50 of the first wind power generation unit 70 is not cascade-connected to the third wind power generation unit 70 to the sixth wind power generation unit 70 The second output ports 50 of the electrical units 70 are connected in cascade), and the second output ports 50 of any two adjacent wind power generation units 70 are connected in cascade (i.e. the negative electrode of the second output port 50 of any one wind power generation unit 70 is connected in series with the positive electrode of the second output port 50 of another wind power generation unit 70 adjacent thereto), for boosting the voltage of the plurality of wind power generation units 70; setting the anode of the second output port 50 in the first wind power generation unit 70 arranged in sequence as the power transmission anode 90 on the direct current side of the distributed offshore sending end converter station, and setting the cathode of the second output port 50 in the last wind power generation unit 70 as the power transmission cathode 100 on the direct current side of the distributed offshore sending end converter station. By designing a plurality of wind power generation units 70, a distributed offshore sending end converter station is formed to replace the function of the traditional booster station, so that the cost of building the booster station in the construction of an offshore wind farm is saved. At present, a centralized offshore booster station performs centralized energy conversion on distributed offshore wind power, and the construction cost of an offshore wind farm is increased. And moreover, the centralized offshore wind farm increases primary energy conversion, the reliability of the whole system is reduced, the efficiency of electric energy conversion is reduced, and the operation and maintenance cost is increased.
The wind power generation unit 70 includes a wind power generator, a three-phase rectifier and a DC-DC converter, wherein an output terminal of the wind power generator is connected to an input terminal of the three-phase rectifier on an alternating current side, and an output terminal of the three-phase rectifier on a direct current side is connected to an input terminal of the DC-DC converter; the wind driven generator is used for converting offshore wind energy into alternating current electric energy; the three-phase rectifier is used for converting the alternating current electric energy converted by the wind driven generator into direct current electric energy; the DC-DC converter is used for converting the direct current electric energy converted by the three-phase rectifier into variable direct current electric energy; the DC side output of the three-phase rectifier is set as the first output port 40 of the wind power generation unit 70, and the output of the DC-DC converter is set as the second output port 50 of the wind power generation unit 70.
The positive electrode and the negative electrode of the first output port 40 of each wind power generation unit 70 are connected in parallel to the parallel direct current bus 60, and are used for collecting the direct current energy of the wind power generation units 70; the second output ports 50 of the wind power generation units 70 are sequentially arranged (when the second output port 50 of one wind power generation unit 70 is cascade-connected to the second output port 50 of one wind power generation unit 70 of all other wind power generation units 70, the second output port 50 of the one wind power generation unit 70 is not cascade-connected to the second output ports 50 of the other wind power generation units 70 except the one wind power generation unit 70 which is cascade-connected, so that the collection of the direct-current electric energy of the plurality of wind power generation units is ensured, the voltage boosting of the plurality of wind power generation units is realized, and the voltage equalization of the second output ports of the plurality of wind power generation units is ensured through voltage and current control.
Example 3:
as shown in fig. 3, in order to solve the above technical problem, an offshore wind power transmission system is provided, which includes the distributed offshore transmitting end converter station 80 and the onshore receiving end converter station 200 described in embodiment 2, wherein a power transmission positive electrode on the dc side of the distributed offshore transmitting end converter station 80 is connected to a positive electrode on the dc side of the onshore receiving end converter station 200, and a power transmission negative electrode on the dc side of the distributed offshore transmitting end converter station 80 is connected to a negative electrode on the dc side of the onshore receiving end converter station 200.
The wind power generation unit 70 includes a wind power generator, a three-phase rectifier and a DC-DC converter, wherein an output terminal of the wind power generator is connected to an input terminal of the three-phase rectifier on an alternating current side, and an output terminal of the three-phase rectifier on a direct current side is connected to an input terminal of the DC-DC converter; the wind driven generator is used for converting offshore wind energy into alternating current electric energy; the three-phase rectifier is used for converting the alternating current electric energy converted by the wind driven generator into direct current electric energy; the DC-DC converter is used for converting the direct current electric energy converted by the three-phase rectifier into variable direct current electric energy; the output terminal of the three-phase rectifier on the DC side is set as the first output port of the wind power generation unit 70, and the output terminal of the DC-DC converter is set as the second output port 50 of the wind power generation unit 70. In addition, at the present stage, technical means and commercial operation experience of a land wind farm are generally transplanted to an offshore wind power project in engineering application, so that a concentrated collection scheme is adopted for the existing offshore wind farm, and the construction of an offshore booster station is indispensable. Offshore wind power distributed direct current collects the scheme in this patent and will cancel offshore booster station, breaks through the traditional theory that prior art scheme bottleneck and engineering were used, reduces the engineering construction cost, has improved the energy conversion efficiency of offshore wind farm. Wherein, the anode of the second output port 50 in the first wind power generation unit 70 arranged in sequence is set as the power transmission anode 90 on the direct current side of the distributed offshore sending end converter station, and the cathode of the second output port 50 in the last wind power generation unit 70 is set as the power transmission cathode 100 on the direct current side of the distributed offshore sending end converter station. Offshore wind power is boosted and conveyed to the direct current side of the onshore inversion station through the distributed sending end converter station, and the alternating current side of the onshore inversion station is merged into the power grid 300.
In a project, 100 offshore wind power generation units are arranged, and each unit has the rated power of 3 MVA. By adopting the wind power generation unit 70 provided by the invention, the output voltage of the first output port can be set to 1000V, the voltage of the second output port can be set to 1500V, the total direct current voltage output by the distributed transmitting end converter station can be calculated to be 1500 × 100=150kV, the bus current is 3MW × 100/150kV =2000A, and the engineering construction requirements can be completely met.
Example 4:
in order to solve the technical problem, a power transmission method for controlling the offshore wind power transmission system is provided, and the method comprises the following steps: controlling a wind power generation unit to enable a wind power generator to convert offshore wind energy into alternating current electric energy, enable a three-phase rectifier to convert the alternating current electric energy converted by the wind power generator into direct current electric energy, and enable a DC-DC converter to convert the direct current electric energy converted by the three-phase rectifier into variable direct current electric energy; controlling the direct current electric energy of the wind power generation units to be boosted and collected to a distributed offshore sending end converter station; and controlling the direct current electric energy of the distributed offshore sending end converter station to be transmitted to an onshore receiving end converter station.
The wind power generation unit comprises a wind power generator, a three-phase rectifier and a DC-DC converter, wherein the output end of the wind power generator is connected with the input end of the alternating current side of the three-phase rectifier, and the output end of the direct current side of the three-phase rectifier is connected with the input end of the DC-DC converter; the wind driven generator is used for converting offshore wind energy into alternating current electric energy; the three-phase rectifier is used for converting the alternating current electric energy converted by the wind driven generator into direct current electric energy; the DC-DC converter is used for converting the direct current electric energy converted by the three-phase rectifier into variable direct current electric energy; and setting the direct-current side output end of the three-phase rectifier as a first output port of the wind power generation unit, and setting the output end of the DC-DC converter as a second output port of the wind power generation unit.
Example 5:
example 1 and example 2 are combined, or example 1, example 2 and example 3 are combined, or example 1, example 2, example 3 and example 4 are combined.
Further, in the control of the power transmission system: the three-phase rectifier adopts a maximum power point tracking control method which is commonly used by the wind power generation unit and is in the prior mature technology, and the DC/DC converter in the wind power generation unit adopts a constant voltage control method to realize the voltage balance of the ports 2 of the wind power generation units.
In the above embodiments 1 to 5, the functions and implementation methods of the respective links are as follows:
1. the wind driven generator converts wind energy into alternating current electric energy, the three-phase rectifier converts the alternating current electric energy into direct current electric energy, and the part can realize electric energy conversion by adopting a common mature control mode of the wind driven generator, such as maximum power point tracking and the like.
2. The DC-DC converter regulates the DC power output from the DC side of the rectifier to output a specified (variable) DC power.
3. The first output ports of the wind power generation units are connected in parallel through the direct current cables, and the collection of the direct current energy of the wind power generation units is realized.
4. The second output ports of the wind power generation units are cascaded through direct current cables (parallel direct current buses), so that the voltage boosting of the plurality of wind power generation units is realized, and the voltage balance of the second output ports of the plurality of wind power generation units is ensured through voltage and current control.
5. And the distributed cascade connection of the second output ports of the plurality of wind power generation units forms a distributed transmitting end converter station of the high-voltage direct-current transmission system.
6. Offshore wind power is boosted and conveyed to a direct current side of a land inverter station through a distributed sending end converter station, an alternating current side of the land inverter station is merged into a power grid, grid-connected power generation of the offshore wind power is achieved, a fixed power control mode is adopted by the distributed sending end circulating current station, and a fixed direct current voltage control mode is adopted by the land inverter station.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (4)
1. A wind power generation unit is characterized by comprising a wind power generator, a three-phase rectifier and a DC-DC converter, wherein the output end of the wind power generator is connected with the input end of the alternating current side of the three-phase rectifier, and the output end of the direct current side of the three-phase rectifier is connected with the input end of the DC-DC converter; the wind driven generator is used for converting offshore wind energy into alternating current electric energy; the three-phase rectifier is used for converting the alternating current electric energy converted by the wind driven generator into direct current electric energy; the DC-DC converter is used for converting the direct current electric energy converted by the three-phase rectifier into variable direct current electric energy; and setting the direct-current side output end of the three-phase rectifier as a first output port of the wind power generation unit, and setting the output end of the DC-DC converter as a second output port of the wind power generation unit.
2. A distributed offshore send-end converter station, characterized by comprising a plurality of wind power generation units according to claim 1, wherein the positive electrode and the negative electrode of the first output port of each wind power generation unit are connected in parallel to a parallel direct current bus for collecting direct current electric energy of the plurality of wind power generation units; the second output ports of the wind power generation units are sequentially arranged, and the second output ports of any two adjacent wind power generation units are connected in cascade and used for boosting the voltage of the plurality of wind power generation units; and setting the anode of the second output port in the first wind power generation unit arranged in sequence as the power transmission anode of the direct current side of the distributed offshore sending end converter station, and setting the cathode of the second output port in the last wind power generation unit as the power transmission cathode of the direct current side of the distributed offshore sending end converter station.
3. An offshore wind power transmission system, comprising the distributed offshore transmitting end converter station and onshore receiving end converter station according to claim 2, wherein the power transmission anode of the direct current side of the distributed offshore transmitting end converter station is connected with the anode of the direct current side of the onshore receiving end converter station, and the power transmission cathode of the direct current side of the distributed offshore transmitting end converter station is connected with the cathode of the direct current side of the onshore receiving end converter station.
4. A power transmission method for controlling the offshore wind power transmission system according to claim 3, characterized by comprising the steps of:
controlling a wind power generation unit to enable a wind power generator to convert offshore wind energy into alternating current electric energy, enable a three-phase rectifier to convert the alternating current electric energy converted by the wind power generator into direct current electric energy, and enable a DC-DC converter to convert the direct current electric energy converted by the three-phase rectifier into variable direct current electric energy;
controlling the direct current electric energy of the wind power generation units to be boosted and collected to a distributed offshore sending end converter station;
and controlling the direct current electric energy of the distributed offshore sending end converter station to be transmitted to an onshore receiving end converter station.
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