CN217135166U - Near-open sea wind power cluster electric energy sending-out system - Google Patents
Near-open sea wind power cluster electric energy sending-out system Download PDFInfo
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- CN217135166U CN217135166U CN202220706390.4U CN202220706390U CN217135166U CN 217135166 U CN217135166 U CN 217135166U CN 202220706390 U CN202220706390 U CN 202220706390U CN 217135166 U CN217135166 U CN 217135166U
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Abstract
The utility model discloses a nearly open sea wind-powered electricity generation cluster electric energy send out system. The system comprises an offshore wind farm, an open sea wind farm and an onshore power grid; wind power of an offshore wind farm is transmitted to a land power grid in a high-voltage alternating-current transmission mode; wind power of the open sea wind power plant is transmitted to a land power grid in a direct current transmission mode of diode rectification; and the offshore wind farm and the open sea wind farm are connected through a third alternating current submarine cable. The utility model overcomes the defect of the prior art that the cost of the AC reference voltage required by the starting of the wind power plant is high; has the advantage of better economy of the whole delivery system.
Description
Technical Field
The utility model relates to an electric power system power transmission and distribution technical field, concretely relates to system is seen off to offshore wind farm electric energy, and more specifically says that it is a nearly open sea wind power generation system electric energy of seeing off, and more specifically says that it is a marine wind power system topology of seeing off that is applicable to open sea wind-powered electricity generation field and coastal waters wind-powered electricity generation field cluster that it is.
Background
Among the various renewable energy power generation modes, wind power generation has been rapidly developed and begins to play an increasingly important role in energy supply due to the advantages of low cost, mature technology, high reliability and the like. On the other hand, as the traditional onshore wind power resource development tends to be saturated, offshore wind power development gradually becomes a new growth highlight and is paid attention to by people. Compared with land wind energy, offshore wind energy has high density and annual available hour rate, does not relate to the problem of land utilization, and has wide market prospect.
For offshore wind farms, high voltage ac systems are generally used to deliver wind power to onshore grids; for the open sea wind power plant, direct current transmission is generally adopted, the existing open sea offshore wind power transmission projects which are built and built adopt flexible direct current transmission technical schemes, a flexible direct current rectification converter station is built on the sea, and a flexible direct current inversion converter station is built on the land. Because the flexible direct current converter valve adopts a modular multilevel structure, the offshore flexible direct current converter station has higher construction cost, larger platform area and weight and higher construction cost, and the offshore wind power flexible direct current transmission project has poorer economy. In order to solve the problem, siemens corporation researches a direct current transmission topological scheme that the offshore converter station adopts diode rectification to send out, and compared with a modular multilevel converter, the diode rectifier has the advantages of low cost, small volume, light weight, high reliability and the like. When the device is used for an offshore wind power direct current sending system, the construction cost of a sending end converter and an offshore platform can be obviously reduced, and the economical efficiency of the system is greatly improved. Because of the uncontrollable nature of the diode rectifier, there are several ways to solve the ac reference voltage required for the start and operation of the wind farm: scheme 1 needs to modify a full-power converter in a fan, so that a traditional fan strategy is changed from a 'network following type' to a 'network construction type', and a 'network construction type' fan needs to be researched and developed again by a manufacturer (as shown in fig. 1); however, the fan needs to be modified in the scheme, and fan manufacturers are required to cooperate, so that the cost is high; scheme 2 needs to lead an alternating current cable from an onshore power grid to the wind farm to provide reference voltage required for starting and running the wind farm (as shown in FIG. 2); however, the alternating current submarine cable led and connected by the scheme is long and high in cost; in the scheme 3, a small-capacity voltage source type converter is connected in parallel at two ends of a diode converter of the offshore station, and is reversely converted into alternating current through reverse power transmission of the onshore station to provide reference voltage for a wind power plant (as shown in figure 3); however, in this scheme, a voltage source type converter needs to be configured in the offshore converter station, which increases the difficulty of system control and the construction cost of the offshore station.
Therefore, designing a more economical open sea wind farm dispatch scheme is a future development direction.
Disclosure of Invention
The utility model aims at providing a nearly open sea wind power cluster electric energy send out system, draw an interchange submarine cable to open sea wind-powered electricity generation field busbar from the nearest coastal waters wind-powered electricity generation field busbar apart from open sea wind-powered electricity generation field, for the open sea wind-powered electricity generation field fan provides the required reference voltage of start-up and operation, this topology takes the coastal waters to exchange and send out the electric wire netting structure that is incorporated into the power networks and is incorporated into the power networks with the open sea direct current of sending out, and the offshore station that the open sea direct current was sent out adopts diode rectification topological structure, shorten the service length of exchanging the submarine cable, need not to reform transform the fan or increase the construction cost of offshore converter station, and the cost is reduced, and the construction economy of offshore converter station is guaranteed; the method overcomes the defects that the prior art cannot provide reference voltage for the open-sea wind power plant due to the uncontrollable property of the diode rectifier and has relatively high cost for providing alternating current reference voltage for starting the open-sea wind power plant.
In order to realize the purpose, the technical scheme of the utility model is that: nearly open sea wind-powered electricity generation cluster electric energy send out system, its characterized in that: including offshore wind farms, offshore wind farms and onshore power grids;
wind power of an offshore wind farm is transmitted to a land power grid in a high-voltage alternating-current transmission mode;
wind power of the open sea wind power station is transmitted to an onshore power grid in a diode rectification direct current transmission mode;
and the offshore wind farm and the open sea wind farm are connected through a third alternating current submarine cable.
In the technical scheme, the offshore wind farm comprises an offshore wind farm group and an offshore wind farm bus;
the offshore wind turbine group is connected with an offshore wind power plant bus through a first alternating current submarine cable; and the offshore wind farm bus is connected with the onshore power grid through a fourth alternating current submarine cable.
In the technical scheme, the open sea wind power plant comprises an open sea wind power plant group, an open sea wind power plant bus bar and a diode rectification sending-out system;
the far-sea wind turbine group is connected with a far-sea wind power plant busbar through a second alternating current submarine cable; the far-sea wind power plant bus bar is connected with a land power grid through a diode rectification sending-out system;
and the far-sea wind power plant bus is connected with the offshore wind power plant bus through a third alternating current submarine cable.
Compared with the prior art, the utility model has the advantages of as follows:
(1) the utility model is suitable for offshore wind power generation and offshore wind power generation cluster, wherein the offshore wind power generation adopts high voltage AC output scheme, and the offshore wind power generation adopts diode rectification DC output scheme; compared with the existing delivery scheme, the whole delivery system has better economy;
(2) the utility model discloses the required AC reference voltage of far-sea wind-powered electricity generation field start and operation is provided by the busbar of coastal waters wind-powered electricity generation field, provides the required reference voltage of fan start and operation for the far-sea wind-powered electricity generation field through the coastal waters wind-powered electricity generation field busbar, then has avoided present prior art scheme because the diode rectifier has uncontrollable nature can't provide reference voltage for the far-sea wind-powered electricity generation field, and prior art provides the relatively higher shortcoming of AC reference voltage cost for the far-sea wind-powered electricity generation field start, the utility model discloses use shorter AC sea cable (compare with lead an AC cable to wind-powered electricity generation field from land electric wire netting in order to provide the required reference voltage of wind-powered electricity generation field start and operation, the utility model discloses the length of the interchange sea cable that shortens is about the coastal offshore distance, and this distance (the length that shortens) can reach about 70km at the utmost, and need not reform the fan or increase the construction cost of offshore converter station, has better economic benefit and feasibility.
Drawings
Fig. 1 is a schematic structural diagram of a system for sending out a grid-type wind turbine wind farm through diode rectification.
Fig. 2 is a schematic diagram of a conventional structure for leading an ac cable from an onshore grid to a wind farm.
Fig. 3 is a schematic structural diagram of a conventional voltage source converter connected in parallel across a diode converter of an offshore station.
Fig. 4 is a schematic structural diagram of the present invention.
In fig. 1, a1 denotes a diode inverter; a2 denotes a voltage source type inverter; a3 denotes a dc sea cable; and B represents a network type fan group.
In fig. 2, C denotes a net-following type wind turbine group; d represents an alternating current cable for connecting a onshore power grid and a following grid type wind power plant bus; a1 denotes a diode inverter; a2 denotes a voltage source type inverter; a3 denotes a dc sea cable.
In fig. 3, C denotes a net-following type wind turbine group; e represents a small-capacity voltage source type converter; a1 denotes a diode inverter; a2 denotes a voltage source type inverter; a3 denotes a dc sea cable.
In the figure, 1-offshore wind power plant, 1.1-offshore wind power plant group, 1.2-offshore wind power plant bus bar, 2-offshore wind power plant, 2.1-offshore wind power plant group, 2.2-offshore wind power plant bus bar, 2.3-diode rectification sending-out system, 3-onshore power grid, 4-alternating current sea cable, 4.1-first alternating current sea cable, 4.2-second alternating current sea cable, 4.3-third alternating current sea cable and 4.4-fourth alternating current sea cable.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be clear and readily appreciated by the description.
The utility model utilizes the offshore wind farm nearest to the offshore wind farm, and leads the AC cable from the wind farm bus bar to the offshore wind farm to provide the AC reference voltage required by the starting and running of the fan of the offshore wind farm; the utility model discloses required alternating current cable length is shorter, and need not to reform transform the fan or increase marine converter station construction cost, has better economic benefits and feasibility.
With reference to the accompanying drawings: the near-open sea wind power cluster electric energy sending system comprises an offshore wind power plant 1, an open sea wind power plant 2 and an onshore power grid 3;
wind power of the offshore wind farm 1 is transmitted to a land power grid 3 in a high-voltage alternating-current transmission mode; the reference voltage required by starting and operating the fan of the offshore wind farm can be obtained by an alternating current submarine cable connected with an onshore power grid;
wind power of the open sea wind power plant 2 is transmitted to the onshore power grid 3 in a direct current transmission mode of diode rectification; because the diode rectifier has uncontrollable property and cannot provide reference voltage required by starting and running for the fan, an alternating current sea cable is led from the bus of the offshore wind farm closest to the far-sea wind farm 2 to the bus of the far-sea wind farm to provide the reference voltage required by starting and running for the fan of the far-sea wind farm;
the ac sea cable 4 comprises a first ac sea cable 4.1, a second ac sea cable 4.2, a third ac sea cable 4.3 and a fourth ac sea cable 4.4;
the offshore wind farm 1 and the open sea wind farm 2 are connected by a third ac sea cable 4.3.
Further, the offshore wind farm 1 comprises an offshore wind farm cluster 1.1 and an offshore wind farm bus 1.2;
the offshore wind farm group 1.1 is connected with an offshore wind farm bus 1.2 through a first alternating current sea cable 4.1; the offshore wind farm bus 1.2 is connected to the onshore grid 3 by a fourth ac sea cable 4.4.
Furthermore, the open sea wind farm 2 comprises an open sea wind farm group 2.1, an open sea wind farm bus bar 2.2 and a diode rectification sending-out system 2.3;
the open sea wind farm group 2.1 is connected with an open sea wind farm bus 2.2 through a second alternating current submarine cable 4.2; the far-sea wind power plant busbar 2.2 is connected with the onshore power grid 3 through a diode rectification sending-out system 2.3;
the open sea wind farm bus 2.2 is connected to the offshore wind farm bus 1.2 by a third ac sea cable 4.3.
Other parts not described belong to the prior art.
Claims (3)
1. The utility model provides a nearly open sea wind-powered electricity generation cluster electric energy send out system which characterized in that: comprises an offshore wind farm (1), an open sea wind farm (2) and an onshore power grid (3);
wind power of the offshore wind farm (1) is transmitted to a land power grid (3) in a high-voltage alternating-current transmission mode;
wind power of the open sea wind power station (2) is transmitted to the onshore power grid (3) in a direct current transmission mode of diode rectification;
the offshore wind farm (1) and the open sea wind farm (2) are connected through a third alternating current sea cable (4.3).
2. The near-open sea wind power cluster electric energy sending system according to claim 1, characterized in that: the offshore wind farm (1) comprises an offshore wind farm group (1.1) and an offshore wind farm bus (1.2);
the offshore wind turbine group (1.1) is connected with an offshore wind power plant bus bar (1.2) through a first alternating current submarine cable (4.1); the offshore wind farm bus (1.2) is connected with the onshore power grid (3) through a fourth alternating current submarine cable (4.4).
3. The near-open sea wind power cluster electric energy delivery system according to claim 1 or 2, characterized in that: the open sea wind farm (2) comprises an open sea wind farm group (2.1), an open sea wind farm bus bar (2.2) and a diode rectification sending-out system (2.3);
the far-sea wind turbine group (2.1) is connected with a far-sea wind turbine bus (2.2) through a second alternating current submarine cable (4.2); the open sea wind farm bus (2.2) is connected with the land power grid (3) through a diode rectification sending-out system (2.3);
the offshore wind farm bus (2.2) is connected with the offshore wind farm bus (1.2) through a third alternating current sea cable (4.3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220706390.4U CN217135166U (en) | 2022-03-29 | 2022-03-29 | Near-open sea wind power cluster electric energy sending-out system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220706390.4U CN217135166U (en) | 2022-03-29 | 2022-03-29 | Near-open sea wind power cluster electric energy sending-out system |
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| CN217135166U true CN217135166U (en) | 2022-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220706390.4U Active CN217135166U (en) | 2022-03-29 | 2022-03-29 | Near-open sea wind power cluster electric energy sending-out system |
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| CN (1) | CN217135166U (en) |
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- 2022-03-29 CN CN202220706390.4U patent/CN217135166U/en active Active
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