CN109510246A - A kind of offshore wind farm direct current grid-connected system - Google Patents
A kind of offshore wind farm direct current grid-connected system Download PDFInfo
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- CN109510246A CN109510246A CN201910013420.6A CN201910013420A CN109510246A CN 109510246 A CN109510246 A CN 109510246A CN 201910013420 A CN201910013420 A CN 201910013420A CN 109510246 A CN109510246 A CN 109510246A
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- 230000005540 biological transmission Effects 0.000 claims description 12
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- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000009833 condensation Methods 0.000 claims description 9
- 230000005494 condensation Effects 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 230000009466 transformation Effects 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 4
- 238000000844 transformation Methods 0.000 claims 2
- 238000010276 construction Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000005684 electric field Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
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- 238000004880 explosion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
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- 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
Abstract
The invention discloses a kind of offshore wind farm direct current grid-connected systems, including boosting connection transformer, bus rod, voltage source converter and its ancillary equipment.Wherein, boosting connection transformer and bus rod are located on offshore platform AC portion, and voltage source converter is located on offshore platform direct current component, are connected between offshore platform AC portion and offshore platform direct current component by shelter bridge.Technical solution of the present invention compact, which boosts to connect to become, replaces AC boosting change and change of current change, reduces occupation area of equipment, saves platform cost and construction cost；Reduce access system impedance, improves blower and access stability；Personnel's life and work region is arranged on direct current component, quarantine measures are set up between the AC portion of oil-containing, there is better safety；Platform is divided into exchange and direct current two parts, reduces manufacturing cost and offshore construction difficulty.
Description
Technical field
The invention belongs to electric system field of power transmission, and in particular to a kind of offshore wind farm direct current grid-connected system.
Background technique
The electric power of marine wind electric field, which is sent to land power grid, AC and DC two ways.It exchanges transmission mode and uses power frequency
It exchanges submarine cable and wind-powered electricity generation electric energy is sent to land.This transmission plan structure is simple, and cost is relatively low, but is primarily adapted for use in coastal waters
Wind power plant is sent out.
The more wide stabilization of off-lying sea wind power resources, to obtain more offshore wind energy resources, marine wind electric field is gradually to depth
Off-lying sea direction is developed.When wind power plant apart from bank be more than 60km, into the open sea regions of broad sense when, wind power AC sends out mode will
Gradually lose cost performance with electric energy loss, the promotion of reactive compensation difficulty and overall cost, and direct current transportation mode then at
For preference.Direct current transportation mode by inverter by wind power AC transformation of electrical energy be direct current energy, by direct current sea cable with compared with
Low loss is sent to bank rotary substation, then accesses power grid from DC converting for exchange.Using direct current mode of movement, particularly flexibility
Direct current transportation mode in addition to be lost small, transmission capacity it is big other than, be also equipped with very strong fault traversing, trouble isolation serviceability and more preferable
Stability, while be also able to achieve marine wind electric field voltage, frequency control etc. comprehensively controls, promote entire wind-electricity integration quality.
One typical offshore wind farm direct current grid-connected system as shown in Figure 1, blower issue electric energy through AC boosting transformation
Device 1 boosts to 200~300kV from 35kV or 66kV, and exchanges sea cable 2 by 5~20km and be sent to the remittance on offshore platform
Bus 3 is flowed, accesses voltage source converter 5 using converter power transformer 4.AC energy is converted to direct current by the inverter
Can, then the voltage source converter 8 positioned at land is sent to by direct current submarine cable 6, direct current energy is converted into AC energy
Afterwards, AC network 10 is injected by converter power transformer 9.From exchange 2 inlet wire of sea cable to the armamentarium 6 outlet of direct current sea cable
The deck being made of positioned at one several steel plates, i.e. on an offshore platform.International conference on large HV electric systems (CIGRE) technical report
619 " HVDC CONNECTION OF OFFSHORE WIND POWER PLANTS " disclose current offshore wind farm and pass through direct current
The various technical solutions of system grid connection.
Offshore wind farm is grid-connected by direct current, and direct current grid-connected system is needed to provide stable alternating voltage.Fig. 4 is Fig. 1 technology
The equivalent circuit diagram of scheme, 41 be step-up transformer equivalent impedance Ztr1, and 42 be converter power transformer equivalent impedance Ztr4, voltage source
Type inverter is equivalent to the combination 43 (ignoring line impedance) of voltage source VSC_voltage Yu internal impedance Zvsc.As it can be seen that sea turn
Electric direct current grid-connected system can be equivalent to voltage source VSC_voltage and connect through equivalent impedance Zvsc+Ztr4+Ztr2 and Wind turbines
It connects.When voltage source is constant, equivalent impedance is bigger, and grid-connected system is weaker to the enabling capabilities of blower.Due to transformer leakage reactance compared with
Greatly, so prior art is unfavorable for blower access stability.
Prior art has following defects that (1) land occupation is big and stability is general；(2) as power system capacity is into one
Step is promoted, and offshore platform scale of construction abruptly increase, cost will be dramatically increased with difficulty of construction；(3) platform offshore distance is more and more remoter, indefinite
Shi Huiyou personnel are resident, and converter valve transformer and alternating-current field oily plant, which exist, to catch fire or risk of explosion, to operations staff's person
Security presence threatens.
Summary of the invention
The object of the present invention is to provide a kind of offshore wind farm direct current grid-connected system, meet that marine wind electric field is remote, big function
The transmission of rate electric energy needs, economical good, highly-safe, easy for construction feature.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of offshore wind farm direct current grid-connected system, including boosting connection transformer, bus rod, voltage source converter.
Wind power plant sends out cable and comes together in bus rod by boosting connection transformer, is connected to voltage source converter.
The offshore wind farm direct current grid-connected system is arranged at least two sub-platforms arranged side by side, in which:
Boosting connection transformer and bus rod are located on offshore platform AC portion, and voltage source converter is located at sea
On platform direct current component, connected between offshore platform AC portion and offshore platform direct current component by least one shelter bridge.Its
In, offshore platform direct current component can also be further divided into two Polar Patforms, pass through at least one shelter bridge between two Polar Patforms
Connection.Shelter bridge is equipped with pedestrian passage and at least one layer of fire prevention isolation device, if there is cable connection between platform, it is logical to be additionally provided with cable
Road.
Preferably, the offshore platform AC portion and the offshore platform direct current component are connected by least two shelter bridges
It connects, it is mutually indepedent between shelter bridge.
Connection between bus rod and voltage source converter can use cable or gas-insulated metal-enclosed defeated
Electric line.
Boosting connection transformer use oil mode or the seawater type of cooling, using two-winding transformer or three around
Group transformer or four winding transformers.
Voltage source converter external condensation system uses air cooling way or the seawater type of cooling.
Offshore platform direct current component designer's work and life region.
Offshore wind farm direct current grid-connected system platform accessory power supply can be from the tertiary winding or the 4th of boosting connection transformer
Winding obtains, and individual auxiliary supply transformer can also be arranged on bus rod and obtain.
Alternating-current field switchgear and DC fields can be also respectively configured in offshore platform AC portion and offshore platform direct current component
Switchgear, realization system put into, exit, state conversion, being isolated, maintenance function；And dispersing apparatus can be used or gas is exhausted
Edge metal enclosed switchgear.
The present invention proposes another offshore wind farm direct current grid-connected system, including at least two DC loops simultaneously；
The DC loop includes boosting to connect transformer, bus rod, sending end voltage source converter, direct current cables,
Receiving end voltage source converter, wind power plant send out cable and come together in bus rod by boosting connection transformer, be connected to and send
Voltage source converter is held, and is connect by direct current cables with receiving end voltage source converter；
Boosting at least two DC loop connects transformer, bus rod, sending end voltage source converter cloth
It sets at least two sets of offshore platforms；
At least a set of in the offshore platform is that at least two sub-platforms arranged side by side are constituted；
Described at least two sub-platforms arranged side by side, including offshore platform AC portion and offshore platform direct current component, wherein
Boosting connection transformer is located on offshore platform AC portion, and bus rod and sending end voltage source converter are located at offshore platform
On direct current component；
The offshore platform AC portion is connect with the offshore platform direct current component by least one shelter bridge；
It is connected between two sets of offshore platforms by least one shelter bridge.
Preferably, the sending end voltage source converter in a DC loop is connected to another directly by DC link
Flow back to the direct current cables on road.
Preferably, the receiving end voltage source converter in a DC loop is connected to another directly by DC link
Flow back to the direct current cables on road.
Preferably, the sending end voltage source converter in a DC loop and receiving end voltage source converter pass through respectively
DC link is connected to the direct current cables of another DC loop.
Preferably, the offshore platform AC portion and the offshore platform direct current component are connected by least two shelter bridges
It connects, it is mutually indepedent between shelter bridge.
Preferably, two sets of offshore platforms are connected by least two shelter bridges, mutually indepedent between shelter bridge.
Preferably, the offshore platform direct current component is divided into two Polar Patforms, passes through at least one between two Polar Patforms
Shelter bridge connection.
Preferably, the shelter bridge is equipped with pedestrian passage and at least one layer of fire prevention isolation device.
Preferably, when having cable connection between platform, the shelter bridge is additionally provided with cable passage.
Preferably, the connection between the bus rod and voltage source converter uses cable or gas-insulated metal
Closed power transmission line.
Preferably, the boosting connection transformer uses oil mode or the seawater type of cooling, uses double winding
Transformer or three-winding transformer or four winding transformers.
Preferably, the external condensation system of the sending end voltage source converter uses air cooling way or the seawater type of cooling.
Preferably, person works and living area are arranged on the offshore platform direct current component.
Preferably, platform accessory power supply is obtained from the tertiary winding of boosting connection transformer or the 4th winding, or is passed through
Individual auxiliary supply transformer is arranged on bus rod to obtain.
Preferably, the DC loop configuration alternating-current field switchgear and DC fields switchgear, realization system investment are moved back
Out, state conversion, isolation, maintenance function；And use dispersing apparatus or Cubicle Gas-Insulated Switchgear.
The invention also provides a kind of offshore wind farm direct current grid-connected systems, including the two poles of the earth DC loop；
Every pole DC loop includes boosting connection transformer, bus rod, sending end voltage source converter, direct current
Cable, receiving end voltage source converter, wind power plant send out cable and come together in bus rod by boosting connection transformer, be connected to
Sending end voltage source converter, and connect by direct current cables with receiving end voltage source converter；
It is connected between the voltage source converter of the two poles of the earth DC loop by pole interconnection；
Boosting in the two poles of the earth DC loop connects transformer, bus rod, and sending end voltage source converter is arranged in
On at least two sets of offshore platforms；
It is connected between two sets of offshore platforms by least one shelter bridge.
Preferably, at least a set of in the offshore platform is that at least two sub-platforms arranged side by side are constituted；
Described at least two sub-platforms arranged side by side, including offshore platform AC portion and offshore platform direct current component, wherein
Boosting connection transformer is located on offshore platform AC portion, and bus rod and sending end voltage source converter are located at offshore platform
On direct current component；
The offshore platform AC portion is connect with the offshore platform direct current component by least one shelter bridge.
Preferably, in the neutral point of described sending end the two poles of the earth voltage source converter and receiving end the two poles of the earth voltage source converter
Property point between pass through the neutral conductor connect.
Preferably, two sets of offshore platforms are connected by least two shelter bridges, mutually indepedent between shelter bridge.
Preferably, the offshore platform AC portion and the offshore platform direct current component are connected by least two shelter bridges
It connects, it is mutually indepedent between shelter bridge.
Preferably, the offshore platform direct current component is divided into two Polar Patforms, passes through at least one between two Polar Patforms
Shelter bridge connection.
Preferably, the shelter bridge is equipped with pedestrian passage and at least one layer of fire prevention isolation device.
Preferably, when having cable connection between platform, the shelter bridge is additionally provided with cable passage.
Preferably, the connection between the bus rod and voltage source converter uses cable or gas-insulated metal
Closed power transmission line.
Preferably, the boosting connection transformer uses oil mode or the seawater type of cooling, uses double winding
Transformer or three-winding transformer or four winding transformers.
Preferably, the external condensation system of the sending end voltage source converter uses air cooling way or the seawater type of cooling.
Preferably, person works and living area are arranged on the offshore platform direct current component.
Preferably, platform accessory power supply is obtained from the tertiary winding of boosting connection transformer or the 4th winding, or is passed through
Individual auxiliary supply transformer is arranged on bus rod to obtain.
Preferably, the DC loop configuration alternating-current field switchgear and DC fields switchgear, realization system investment are moved back
Out, state conversion, isolation, maintenance function；And use dispersing apparatus or Cubicle Gas-Insulated Switchgear.
The beneficial effects of the present invention are:
Replace AC boosting change and change of current change 1. being boosted with compact and connecting to become, reduces occupation area of equipment, save platform
Cost and construction cost；Reduce access system impedance, improves blower and access stability.
2. the alternating current equipment of oil-containing and the DC equipment of not oil-containing divide platform to arrange, the setting of personnel's life and work region is existed
On direct current component, quarantine measures are set up between the AC portion of oil-containing, and there is better safety；
3. platform is divided into exchange and direct current two parts, manufacturing cost and offshore construction difficulty are reduced.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is a kind of offshore wind farm direct current grid-connected system prior art.
Fig. 2 is a kind of improved offshore wind farm direct current grid-connected system.
Fig. 3 is a kind of offshore wind farm direct current grid-connected system of dipolar configuration.
Fig. 4 is offshore wind farm direct current grid-connected system prior art equivalent circuit diagram.
Fig. 5 is improved offshore wind farm direct current grid-connected system equivalent circuit diagram.
Fig. 6 is a kind of multiloop offshore wind farm direct current grid-connected system.
Fig. 7 is a kind of offshore wind farm direct current grid-connected system embodiment one of multiloop redundancy-type.
Fig. 8 is a kind of offshore wind farm direct current grid-connected system embodiment two of multiloop redundancy-type.
Fig. 9 is a kind of offshore wind farm direct current grid-connected system embodiment three of multiloop redundancy-type.
Figure 10 is a kind of offshore wind farm direct current grid-connected system of true dipolar configuration.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention is described in detail.
Embodiment 1:
Offshore wind farm direct current grid-connected system in the present embodiment includes boosting connection transformer, bus rod, voltage-source type
Inverter.Wind power plant sends out cable and comes together in bus rod by boosting connection transformer, is connected to voltage source converter.
The offshore wind farm direct current grid-connected system is arranged at least two sub-platforms arranged side by side, in which:
Boosting connection transformer and bus rod are located on offshore platform AC portion, and voltage source converter is located at sea
On platform direct current component, connected between offshore platform AC portion and offshore platform direct current component by least one shelter bridge.Its
In, offshore platform direct current component can also be further divided into two Polar Patforms, pass through at least one shelter bridge between two Polar Patforms
Connection.Shelter bridge is equipped with pedestrian passage and at least one layer of fire prevention isolation device, if there is cable connection between platform, it is logical to be additionally provided with cable
Road.
Connection between bus rod and voltage source converter uses cable or gas-insulated metal-enclosed power transmission line
Road.
Boosting connection transformer use oil mode or the seawater type of cooling, using two-winding transformer or three around
Group transformer or four winding transformers.
Voltage source converter external condensation system uses air cooling way or the seawater type of cooling.
Offshore platform direct current component designer's work and life region.
Offshore wind farm direct current grid-connected system platform accessory power supply can be from the tertiary winding or the 4th of boosting connection transformer
Winding obtains, and individual auxiliary supply transformer can also be arranged on bus rod and obtain.
Alternating-current field switchgear and DC fields can be also respectively configured in offshore platform AC portion and offshore platform direct current component
Switchgear, realization system put into, exit, state conversion, being isolated, maintenance function；And dispersing apparatus can be used or gas is exhausted
Edge metal enclosed switchgear.
Embodiment 2:
Be illustrated in figure 2 a kind of improved offshore wind farm direct current grid-connected system, marine wind electric field electric energy by 35kV or
The boosting that 66kV ac cable 11 accesses offshore wind farm direct current grid-connected system connects transformer 12, which directly rises from 35kV
It is pressed onto 200kV~300kV, using oil mode or the seawater type of cooling.When have twice and the above wind power plant inlet wire electricity
When cable, three-winding transformer is used to further increase system integration degree.
Boosting connection 12 outlet of transformer accesses voltage source converter 14 through bus rod 13.Inverter 14 is generally three
Phase element, each phase element are divided into bridge arm and lower bridge arm, are constituted on each bridge arm by being serially connected multiple submodule and reactor,
The most common submodule topology includes half-bridge, full-bridge etc., completes conversion of the electric energy from AC-to DC.Converter valve cooling system by
Inner cold system and external condensation system two parts are constituted, and inner cold system is closing pure water cooling system, and external condensation system is seawater cooling system
System takes away the amount of heat generated inside converter valve by inside and outside SAPMAC method.DC side is sent to position by direct current submarine cable 18
Direct current energy is converted to AC energy by it by the inverter 19 in land, becomes 20 access AC networks using the change of current.
The offshore wind farm direct current grid-connected system is arranged at least two sub-platforms arranged side by side.Transformation is wherein connected with boosting
Device 12, the exchange field device that bus rod 13 is core are arranged on offshore platform AC portion 15, DC control and protection system
In alternating-current field control flow also is located on the platform on the spot.DC equipment and entire DC control with inverter 14 for core
Protection system is arranged on offshore platform direct current component 16.In order to ensure personal safety, person works and living space are set to
On the platform.Pass through shelter bridge 17A and 17B connection between offshore platform AC portion 15 and direct current component 16.Two shelter bridges are mutual
It is independent, each it is divided into two layers, one layer is pedestrian passage, and one layer is cable passage.Exchange cable between field device and converter valve,
Control protection system cable is arranged in cable passage.Multiple fire prevention isolation device is arranged in shelter bridge, and fire occurs in a platform
Fire spreading can be cut off when calamity, ensure another platform personnel, equipment safety.
It can also can also pass through gas by cable connection between boosting connection transformer 12 and voltage source converter 14
Body insulation metal closed transmission line of electricity GIL connection.
The accessory power supply of entire offshore platform can connect the tertiary winding become from three winding and extract, can also be female in confluence
Individual auxiliary supply transformer is arranged on line to obtain.In addition, four winding transformers can be also designed, wherein two windings are used for
Wind power plant is accessed, tertiary winding connection boosting connection becomes, and the 4th winding extracts accessory power supply.
Alternating-current field and DC fields can also configure the alternating-current field switchgear and DC fields switchgear of different structure, such as be isolated
Disconnecting link, breaker, grounding switch etc. such as put into realization system, exit at the functions such as methods of operation conversion or isolation, maintenance.And
Gas-insulated metal-enclosed technology, such as Cubicle Gas-Insulated Switchgear can be used in exchange field device and direct current field device
GIS etc..
When direct current system is using bipolar topology, offshore platform direct current component can also be into one in preferred embodiment 3
Step is divided into two Polar Patforms, and according to marine wind electric field construction progress, two Polar Patforms of Minute stage construction, as shown in Figure 3.Pole
1 voltage source converter 14A is located on 1 platform 16A of pole, and 2 voltage source converter 14B of pole is located on 2 platform 16B of pole.Two
It is connected between platform by shelter bridge 17C, the shelter bridge is by channel as personnel and cable simultaneously.
Fig. 5 is the equivalent circuit diagram of Fig. 2 technical solution, and 51 be boosting connection 12 equivalent impedance Ztrc of transformer, voltage source
Type inverter is equivalent to Zvsc+Ztrc.Since the general value of transformer leakage reactance is that 12% to 20%, Ztrc will be far smaller than Ztr4
+ Ztr2, scheme compared with prior art, the enabling capabilities of offshore wind turbine are substantially improved in direct current grid-connected system, to improve wind
The stability of machine access.
Embodiment 4:
A kind of multiloop offshore wind farm direct current grid-connected system shown in fig. 6 is the another of offshore wind farm direct current grid-connected system
Kind embodiment.A part of marine wind electric field unit accesses the grid-connected system of offshore wind farm direct current by 35kV or 66kV ac cable 61
Two windings or three winding the boosting connection transformer 62 of system, are connected through bus rod 63 with sending end voltage source converter 64.Institute
Boosting connection transformer 62, bus rod 63 and voltage source converter 64 is stated to be located on a marine alternating current-direct current platform 70, it should
Platform is unattended platform.Another part marine wind electric field unit accesses the boosting of two windings by 35kV or 66kV ac cable
Transformer 66 is connected, is connected through bus rod 67 with sending end voltage source converter 68.The boosting connection transformer is located at sea
On upper mounting plate AC portion 71, the bus rod 67 and voltage source converter 68 are located on offshore platform direct current component 72.
When there are multiple boosting connection transformers, there can be multiple offshore platform AC portions as its carrying platform.People
Employee makees and living space is set on offshore platform direct current component.And marine alternating current-direct current platform 70 and offshore platform direct current portion
Divide between 72 and connected by least one shelter bridge, multiple fire prevention isolation device is arranged in shelter bridge, can when fire occurs for a platform
Fire spreading is cut off, ensures another platform personnel, equipment safety.
Sending end voltage source converter 64 is connected by direct current cables 65 with the receiving end voltage source converter 73 for being located at land
It connects, then passes through direct current cables via 74 access exchange bus rods of change of current change and AC network, sending end voltage source converter 68
69 are connected with the receiving end voltage source converter 76 for being located at land, then become 77 access exchange bus rods and alternating current via the change of current
Net.And the DC loop and sending end voltage-source type being made of sending end voltage source converter 64 and receiving end voltage source converter 73
The DC loop that inverter 68 and receiving end voltage source converter 76 form is mutually indepedent.
In this scheme, wind power plant is directly connect with voltage source converter by boosting connection transformer, equivalent resistance
Resist small, effectively improves wind-electricity integration stability；Oil-free equipment concentration is arranged in personnel activity region, comparatively safe sea is put down
On platform direct current component, and there is fire prevention isolation device isolation between each platform, has utmostly ensured personal safety；By direct current cables phase
Two direct current transportation circuits even are mutually indepedent, and any one loop fault still ensures that the electric energy of half wind power plant is steadily sent out,
Effectively improve the reliability of entire grid-connected system.
Embodiment 5:
A kind of improved plan based on embodiment 4 is as shown in Figure 7.Sending end voltage source converter 64 is through direct current cables 65
It connect with receiving end voltage source converter 73, while being connect through DC link 79 with receiving end voltage source converter 76.Equally
, sending end voltage source converter 68 is connect through direct current cables 69 with receiving end voltage source converter 76, while through DC contact
Line 78 is connected with receiving end voltage source converter 73.Using kind of a structure, receiving end voltage source converter 73 and receiving end voltage-source type
Inverter 76 can be substituted for each other, to improve the reliability of entire direct current grid-connected system.
Embodiment 6:
A kind of improved plan based on embodiment 4 is as shown in Figure 8.Sending end voltage source converter 64 is through direct current cables 65
It is connected with receiving end voltage source converter 73, is connected through DC link 80 with direct current cables 69；Sending end voltage source converter
68 are connected through direct current cables 69 with receiving end voltage source converter 76, are connected through DC link 81 with direct current cables 65.Direct current
Interconnection 80 and DC link 81 are laid in the shelter bridge between marine alternating current-direct current platform 70 and offshore platform direct current component 72.
Using this structure, sending end voltage source converter 64 can be substituted for each other with sending end voltage source converter 68,
To improve the reliability of entire direct current grid-connected system.
Embodiment 7:
A kind of improved plan based on embodiment 4 is as shown in Figure 9.Sending end voltage source converter 64 is through direct current cables 65
It is connected with receiving end voltage source converter 73, is connected through DC link 80 with direct current cables 69；Sending end voltage source converter
68 are connected through direct current cables 69 with receiving end voltage source converter 76, are connected through DC link 81 with direct current cables 65.Direct current
Interconnection 80 and DC link 81 are laid in the shelter bridge between marine alternating current-direct current platform 70 and offshore platform direct current component 72.
The other end of direct current cables 65 connects receiving end voltage source converter 73, through DC link 79 and receiving end voltage source converter
76 are connected；The other end of direct current cables 69 connects receiving end voltage source converter 76, through DC link 78 and receiving end voltage source
Type inverter 73 is connected.
Using this structure, not only receiving end voltage source converter 73 can be replaced mutually with receiving end voltage source converter 76
Generation, and sending end voltage source converter 64 can be also substituted for each other with sending end voltage source converter 68, to further increase
The reliability of entire direct current grid-connected system.
Embodiment 8:
Figure 10 is the another embodiment of offshore wind farm direct current grid-connected system.A part of marine wind electric field unit passes through
35kV or 66kV ac cable 61 accesses two windings or three winding boosting connection transformer 62 of offshore wind farm direct current grid-connected system,
It is connected through bus rod 63 with 1 sending end voltage source converter 90 of pole.The boosting connection transformer, 1 electricity of bus rod and pole
Potential source type inverter is located on a marine alternating current-direct current platform 70, which is unattended platform.Another part offshore wind farm
Field unit accesses two windings boosting connection transformer 66 by 35kV or 66kV ac cable, through bus rod 67 and 2 sending end of pole
Voltage source converter 91 is connected.The boosting connection transformer is located on offshore platform AC portion 71, the bus rod
It is located on offshore platform direct current component 72 with voltage source converter.1 sending end voltage source converter 90 of pole and 2 voltage-source type of pole
Inverter is connected by pole interconnection 92.
When there are multiple boosting connection transformers, there can be multiple offshore platform AC portions as its carrying platform.People
Employee makees and living space is set on offshore platform direct current component.And marine alternating current-direct current platform 70 and offshore platform direct current portion
Divide between 72 and connected by least one shelter bridge, multiple fire prevention isolation device is arranged in shelter bridge, can when fire occurs for a platform
Fire spreading is cut off, ensures another platform personnel, equipment safety.Shelter bridge further includes cable passage, and laying includes pole interconnection 92
Connection cables inside.
1 sending end voltage source converter 90 of pole is changed by 1 direct current cables 93 of pole with the 1 receiving end voltage-source type of pole for being located at land
It flows device 95 to connect, then becomes 98 access exchange bus rods and AC network, 2 sending end voltage source converter of pole via 1 change of current of pole
91 are connected by 2 direct current cables 94 of pole with the 2 receiving end voltage-source type 96 of pole for being located at land, then are become 99 accesses via 2 change of current of pole and handed over
Flow bus rod and AC network.By pole between 2 receiving end voltage source converter 96 of 1 receiving end voltage source converter 95 of pole and pole
Interconnection 97 connects.
1 receiving end of neutral point and pole between 2 sending end voltage source converter 91 of 1 sending end voltage source converter 90 of pole and pole
Neutral point between 2 receiving end voltage source converter 96 of voltage source converter 95 and pole is connected by neutral conductor cable 100.
In another embodiment 9, if pole 1 and pole 2 are full symmetric, 1 sending end voltage source converter 90 of pole and pole 2
Neutral-point solid ground between sending end voltage source converter 91, while 2 receiving end voltage-source type of 1 receiving end voltage-source type 95 of pole and pole
Neutral point between 96 is also directly grounded, and is not necessarily to neutral conductor cable connection.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (40)
1. a kind of offshore wind farm direct current grid-connected system, it is characterised in that: connect transformer, bus rod, voltage source including boosting
Type inverter, wind power plant send out cable and come together in bus rod by boosting connection transformer, are connected to the voltage-source type change of current
Device；
The offshore wind farm direct current grid-connected system is arranged at least two sub-platforms arranged side by side, in which:
The boosting connection transformer and bus rod are located on offshore platform AC portion, and the voltage source converter is located at
On offshore platform direct current component；
The offshore platform AC portion is connect with the offshore platform direct current component by least one shelter bridge.
2. offshore wind farm direct current grid-connected system according to claim 1, it is characterised in that: the offshore platform AC portion
It is connect with the offshore platform direct current component by least two shelter bridges, it is mutually indepedent between shelter bridge.
3. offshore wind farm direct current grid-connected system according to claim 1, it is characterised in that: the offshore platform direct current component
It is divided into two Polar Patforms, is connected between two Polar Patforms by least one shelter bridge.
4. offshore wind farm direct current grid-connected system according to any one of claims 1 to 3, it is characterised in that: the shelter bridge is set
There are pedestrian passage and at least one layer of fire prevention isolation device.
5. offshore wind farm direct current grid-connected system according to claim 4, it is characterised in that: when having cable connection between platform,
The shelter bridge is additionally provided with cable passage.
6. offshore wind farm direct current grid-connected system according to claim 1, it is characterised in that: the bus rod and voltage source
Connection between type inverter uses cable or gas-insulated metal closed power transmission line.
7. offshore wind farm direct current grid-connected system according to claim 1, it is characterised in that: the boosting connection transformer makes
With oil mode or the seawater type of cooling, two-winding transformer or three-winding transformer or four winding transformers are used.
8. offshore wind farm direct current grid-connected system according to claim 1, it is characterised in that: the voltage source converter
External condensation system uses air cooling way or the seawater type of cooling.
9. offshore wind farm direct current grid-connected system according to claim 1, it is characterised in that: person works and living area are set
It sets on the offshore platform direct current component.
10. offshore wind farm direct current grid-connected system according to claim 1, it is characterised in that: platform accessory power supply is from boosting
The tertiary winding or the 4th winding for connecting transformer obtain, or by the way that individual accessory power supply transformation is arranged on bus rod
Device obtains.
11. offshore wind farm direct current grid-connected system according to claim 1, it is characterised in that: offshore platform exchange portion
Point and offshore platform direct current component be respectively configured alternating-current field switchgear and DC fields switchgear, realization system puts into, exits,
State conversion, isolation, maintenance function；And use dispersing apparatus or Cubicle Gas-Insulated Switchgear.
12. a kind of offshore wind farm direct current grid-connected system, it is characterised in that: including at least two DC loops；
The DC loop includes boosting connection transformer, bus rod, sending end voltage source converter, direct current cables, receiving end
Voltage source converter, wind power plant send out cable and come together in bus rod by boosting connection transformer, are connected to sending end electricity
Potential source type inverter, and connect by direct current cables with receiving end voltage source converter；
Boosting at least two DC loop connects transformer, bus rod, and sending end voltage source converter is arranged in
On at least two sets of offshore platforms；
At least a set of in the offshore platform is that at least two sub-platforms arranged side by side are constituted；
Described at least two sub-platforms arranged side by side, including offshore platform AC portion and offshore platform direct current component, wherein boosting
Connection transformer is located on offshore platform AC portion, and bus rod and sending end voltage source converter are located at offshore platform direct current
On part；
The offshore platform AC portion is connect with the offshore platform direct current component by least one shelter bridge；
It is connected between two sets of offshore platforms by least one shelter bridge.
13. offshore wind farm direct current grid-connected system according to claim 12, it is characterised in that: sending in a DC loop
End voltage source converter is connected to the direct current cables of another DC loop by DC link.
14. offshore wind farm direct current grid-connected system according to claim 12, it is characterised in that: in a DC loop by
End voltage source converter is connected to the direct current cables of another DC loop by DC link.
15. offshore wind farm direct current grid-connected system according to claim 12, it is characterised in that: sending in a DC loop
End voltage source converter and receiving end voltage source converter pass through DC link respectively and are connected to another DC loop
Direct current cables.
16. offshore wind farm direct current grid-connected system according to claim 12, it is characterised in that: offshore platform exchange portion
Divide and is connect with the offshore platform direct current component by least two shelter bridges, it is mutually indepedent between shelter bridge.
17. offshore wind farm direct current grid-connected system according to claim 12, it is characterised in that: two sets of offshore platforms are by extremely
Few two shelter bridges connect, mutually indepedent between shelter bridge.
18. offshore wind farm direct current grid-connected system according to claim 12, it is characterised in that: offshore platform direct current portion
It is divided into two Polar Patforms, is connected between two Polar Patforms by least one shelter bridge.
19. 2 to 18 described in any item offshore wind farm direct current grid-connected systems according to claim 1, it is characterised in that: the shelter bridge
Equipped with pedestrian passage and at least one layer of fire prevention isolation device.
20. offshore wind farm direct current grid-connected system according to claim 19, it is characterised in that: there is cable connection between platform
When, the shelter bridge is additionally provided with cable passage.
21. offshore wind farm direct current grid-connected system according to claim 12, it is characterised in that: the bus rod and voltage
Connection between the type inverter of source uses cable or gas-insulated metal closed power transmission line.
22. offshore wind farm direct current grid-connected system according to claim 12, it is characterised in that: the boosting connects transformer
Using oil mode or the seawater type of cooling, two-winding transformer or three-winding transformer or four winding transformations are used
Device.
23. offshore wind farm direct current grid-connected system according to claim 12, it is characterised in that: the sending end voltage-source type changes
The external condensation system for flowing device uses air cooling way or the seawater type of cooling.
24. offshore wind farm direct current grid-connected system according to claim 12, it is characterised in that: person works and living area
It is arranged on the offshore platform direct current component.
25. offshore wind farm direct current grid-connected system according to claim 12, it is characterised in that: platform accessory power supply is from boosting
The tertiary winding or the 4th winding for connecting transformer obtain, or by the way that individual accessory power supply transformation is arranged on bus rod
Device obtains.
26. offshore wind farm direct current grid-connected system according to claim 12, it is characterised in that: the DC loop configuration is handed over
Flow field switchgear and DC fields switchgear, realization system put into, exit, state conversion, being isolated, maintenance function；And it uses
Dispersing apparatus or Cubicle Gas-Insulated Switchgear.
27. a kind of offshore wind farm direct current grid-connected system, it is characterised in that: including the two poles of the earth DC loop；
Every pole DC loop includes boosting to connect transformer, bus rod, sending end voltage source converter, direct current cables,
Receiving end voltage source converter, wind power plant send out cable and come together in bus rod by boosting connection transformer, be connected to and send
Voltage source converter is held, and is connect by direct current cables with receiving end voltage source converter；
It is connected between the voltage source converter of the two poles of the earth DC loop by pole interconnection；
Boosting in the two poles of the earth DC loop connects transformer, bus rod, and sending end voltage source converter is arranged at least
On two sets of offshore platforms；
It is connected between two sets of offshore platforms by least one shelter bridge.
28. offshore wind farm direct current grid-connected system according to claim 27, it is characterised in that: in the offshore platform at least
Having a set of is that at least two sub-platforms arranged side by side are constituted；
Described at least two sub-platforms arranged side by side, including offshore platform AC portion and offshore platform direct current component, wherein boosting
Connection transformer is located on offshore platform AC portion, and bus rod and sending end voltage source converter are located at offshore platform direct current
On part；
The offshore platform AC portion is connect with the offshore platform direct current component by least one shelter bridge.
29. the offshore wind farm direct current grid-connected system according to claim 27 or 28, it is characterised in that: sending end the two poles of the earth electricity
It is connected between the neutral point of potential source type inverter and the neutral point of receiving end the two poles of the earth voltage source converter by the neutral conductor.
30. offshore wind farm direct current grid-connected system according to claim 27, it is characterised in that: two sets of offshore platforms are by extremely
Few two shelter bridges connect, mutually indepedent between shelter bridge.
31. offshore wind farm direct current grid-connected system according to claim 28, it is characterised in that: offshore platform exchange portion
Divide and is connect with the offshore platform direct current component by least two shelter bridges, it is mutually indepedent between shelter bridge.
32. offshore wind farm direct current grid-connected system according to claim 28, it is characterised in that: offshore platform direct current portion
It is divided into two Polar Patforms, is connected between two Polar Patforms by least one shelter bridge.
33. according to the described in any item offshore wind farm direct current grid-connected systems of claim 27 to 32, it is characterised in that: the shelter bridge
Equipped with pedestrian passage and at least one layer of fire prevention isolation device.
34. offshore wind farm direct current grid-connected system according to claim 33, it is characterised in that: there is cable connection between platform
When, the shelter bridge is additionally provided with cable passage.
35. offshore wind farm direct current grid-connected system according to claim 27, it is characterised in that: the bus rod and voltage
Connection between the type inverter of source uses cable or gas-insulated metal closed power transmission line.
36. offshore wind farm direct current grid-connected system according to claim 27, it is characterised in that: the boosting connects transformer
Using oil mode or the seawater type of cooling, two-winding transformer or three-winding transformer or four winding transformations are used
Device.
37. offshore wind farm direct current grid-connected system according to claim 27, it is characterised in that: the sending end voltage-source type changes
The external condensation system for flowing device uses air cooling way or the seawater type of cooling.
38. offshore wind farm direct current grid-connected system according to claim 28, it is characterised in that: person works and living area
It is arranged on the offshore platform direct current component.
39. offshore wind farm direct current grid-connected system according to claim 27, it is characterised in that: platform accessory power supply is from boosting
The tertiary winding or the 4th winding for connecting transformer obtain, or by the way that individual accessory power supply transformation is arranged on bus rod
Device obtains.
40. offshore wind farm direct current grid-connected system according to claim 27, it is characterised in that: the DC loop configuration is handed over
Flow field switchgear and DC fields switchgear, realization system put into, exit, state conversion, being isolated, maintenance function；And it uses
Dispersing apparatus or Cubicle Gas-Insulated Switchgear.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910013420.6A CN109510246A (en) | 2019-01-07 | 2019-01-07 | A kind of offshore wind farm direct current grid-connected system |
| PCT/CN2020/070687 WO2020143622A1 (en) | 2019-01-07 | 2020-01-07 | Maritime wind power dc grid connection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910013420.6A CN109510246A (en) | 2019-01-07 | 2019-01-07 | A kind of offshore wind farm direct current grid-connected system |
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| CN109510246A true CN109510246A (en) | 2019-03-22 |
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| WO2020143622A1 (en) * | 2019-01-07 | 2020-07-16 | 南京南瑞继保电气有限公司 | Maritime wind power dc grid connection system |
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| NO347131B1 (en) * | 2021-03-17 | 2023-05-30 | Aker Solutions As | A high voltage offshore power plant power distribution assembly, a high voltage subsea transformer, and a appurtenant installation method |
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