CN110224426A - Generate electricity Transmission system - Google Patents
Generate electricity Transmission system Download PDFInfo
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- CN110224426A CN110224426A CN201810172202.2A CN201810172202A CN110224426A CN 110224426 A CN110224426 A CN 110224426A CN 201810172202 A CN201810172202 A CN 201810172202A CN 110224426 A CN110224426 A CN 110224426A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 111
- 230000005611 electricity Effects 0.000 title claims abstract description 43
- 238000010248 power generation Methods 0.000 claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims description 27
- 238000010586 diagram Methods 0.000 description 14
- 230000003071 parasitic effect Effects 0.000 description 9
- 230000008901 benefit Effects 0.000 description 4
- 210000004209 hair Anatomy 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
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Classifications
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- H02J3/386—
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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
Abstract
Embodiment of the present invention discloses a kind of power generation Transmission system, including a generating set, the generating set includes a plurality of generator units, a plurality of generator units are connected in series, wherein each generator unit respectively includes a current transformer and a generator connecting with the current transformer；And high-voltage dc transmission electrical cables, the high-voltage dc transmission electrical cables include at least one positive power transmission cable and a cathode power transmission cable, the both ends of the anode power transmission cable are connect with the anode of the generating set and a transmission device respectively, and the both ends of the cathode power transmission cable are connect with the cathode of the generating set and the transmission device respectively.It meets in power generation Transmission system, double requirements technically and economically.Solves the technical issues of middle pressure motor and high voltage power transmission in offshore electricity generation system are matched.
Description
Technical field
The present invention relates to power generation transmission fields, particularly relate to a kind of power generation Transmission system.The present invention is more particularly directed to offshore winds
Electricity power generation Transmission system.
Background technique
Currently, the welcome increasingly by market of the generation technology of renewable energy, and wind-powered electricity generation is wherein using most
For extensive form.It is said from geographical location, wind power plant both may be mounted at land, also may be mounted at sea.
The mode of its early stage, referred to as in land wind electricity, opposite generated energy is limited to the area in geographical location and effective power generation region.
Offshore wind-powered electricity generation later is then the energy power generation mode with bigger potentiality, and reason is deepwater wind power equipment installation position
It sets unrestricted.In addition, the energy reserve of offshore wind-powered electricity generation is huge.
Wind power generation system generally comprise turbine, generator (whether with gear-box depend on application turbine technology) and
Current transformer.Because wind speed is always in variable condition, the frequency of acquisition electric energy is also in variation when being exported by generator
State, therefore usually require to increase current transformer to realize the connection between generator and power grid.In frequency control, current transformer
Voltage control or current control can also be realized according to the different of control strategy, in addition, current transformer is also equipped with the energy of fault traversing
Power.
Because offshore wind energy electricity is huge, when being built on ocean using large-scale wind electricity turbine (> 5MW), builds and spread
If the advantage of lower cost of cable can make its maximum revenue.When being generated electricity using pressure (MV) in the progress of large-scale wind electricity generator,
The cost performance optimized the most can be obtained.The challenge of offshore wind power system converter topology is at this stage: because long-range
Transmission of electricity needs to carry out high voltage power transmission, then, how middle pressure motor passes through current transformer is matched with high-voltage transmission equipment, and same
When meet double requirements in economic and technical, become technical problem urgently to be resolved.
Summary of the invention
In view of this, this application provides a kind of power generation Transmission system, to solve in the technology that meets and economically dual
Under it is required that, the technical issues of how middle pressure motor and high-voltage transmission equipment in offshore electricity generation system are matched.
This application provides a kind of power generation Transmission system, including a generating set, the generating set includes a plurality of hairs
Electric motor units, a plurality of generator units are connected in series, and each generator unit includes a current transformer and one
The generator being connect with the current transformer；With
One high-voltage dc transmission electrical cables, the high-voltage dc transmission electrical cables include at least one positive power transmission cable and a cathode
The both ends of power transmission cable, the anode power transmission cable are connect with the anode of the generating set and a transmission device respectively, described
The both ends of cathode power transmission cable are connect with the cathode of the generating set and the transmission device respectively.Present embodiment discloses
Current transformer connect with generator to form and is generated electricity by a kind of topology location layout type for the Transmission system that generates electricity using this kind of mode
Machine unit, with the generator unit further progress series design.Solve the generator unit in electricity generation system with
The technical issues of high-voltage transmission equipment is matched.
In one embodiment, the current transformer includes: a positive bus-bar, and positive bus-bar is direct current outlet anode；One negative
Bus, negative busbar are direct current outlet cathode；Two or three series circuit is parallel with one another and both ends be connected to positive bus-bar with
In negative busbar.Wherein every series circuit includes: two inductance, and described two inductance are connected in series, and described two inductance it
Between connecting pin be exchange leading-out terminal；The current transformer further includes the first bridge circuit module group, is connected on the positive bus-bar
Between the inductance, including a plurality of bridge circuit modules；And the second bridge circuit module group, it is connected on the negative mother
Between line and the inductance, including a plurality of bridge circuit modules.Present embodiments provide for a kind of physical circuits of current transformer
Structure.
In one embodiment, the bridge circuit module is half-bridge circuit module or full-bridge circuit module.To the electricity
Bridge circuit module is further limited, and the half-bridge circuit module or full-bridge circuit module can be used.
In one embodiment, the half-bridge circuit module includes: at least one first capacitor；With the first transistor and
Two-transistor, the collector of the first transistor and the anode of first capacitor connect, the emitter of the first transistor and the second crystal
The collector of pipe connects, and the emitter of second transistor and the cathode of first capacitor connect；
At least one first connecting pin, the first connecting pin are arranged between the first transistor and second transistor；
At least one second connection end, second connection end are arranged between second transistor and first capacitor, the half-bridge
Circuit module is connected in circuit by the first connecting pin with second connection end.It further discloses in the present embodiment described
The physical circuit connection relationship of half-bridge circuit module.
Further, the full-bridge circuit module includes: at least one second capacitor；With third transistor and the 4th crystal
Pipe, the positive of the collector of the third transistor and second capacitor connect, the emitter of the third transistor and the
The collector of four transistors connects, and the emitter of the 4th transistor is connect with the cathode of second capacitor；
Described second is connected in parallel on after 5th transistor and the 6th transistor, the 5th transistor and the series connection of the 6th transistor
On the positive and negative anodes of capacitor, the collector of the 5th transistor is connect with the anode of second capacitor, the 5th transistor
Emitter connect with the collector of the 6th transistor, the cathode of the emitter of the 6th transistor and second capacitor connects
It connects；
At least one third connecting pin, third connecting pin setting the third transistor and the 4th transistor it
Between；
At least one the 4th connecting pin, the 4th connecting pin setting the 5th transistor and the 6th transistor it
Between, the full-bridge circuit module is connected in circuit by the third connecting pin and the 4th connecting pin.In this embodiment party
The physical circuit connection relationship of the full-bridge circuit module is further disclosed in formula.
In one embodiment, in the same generator unit, the number of phases phase of the item number and generator of series circuit
Together, different from current transformer series circuit connections, the exchange that phase foot is connected to series circuit go out the phase foot of generator respectively
On line end.Disclose in the present embodiment the generator how with the current transformer carry out circuit connection.
In one embodiment, normally closed switch is provided between generator and current transformer, positioned at the positive pole of the current transformer
Normal open switch is parallel between line and negative busbar.Present embodiments provide for a kind of specific switch protecting circuit structures, are used for
When wherein generator unit damages, system works on around the generator unit of damage or the generator of disconnection damage.
In one embodiment, normally closed switch is contactor or breaker, and normal open switch is contactor.In present embodiment
In provide a kind of normally closed switch and normal open switch specific embodiment.
In one embodiment, present invention also provides a kind of offshore wind-powered electricity generation power generation Transmission system, hairs as described above
Electrical transmission system is offshore wind-powered electricity generation power generation Transmission system.Wherein, the generating set is set to the sea of offshore, the high straightening
Stream power transmission cable is embedded in seabed and the transmission device is set on the bank.A kind of hair is provided in the present embodiment mode
The geographical location set-up mode of motor group and high-voltage dc transmission electrical cables and the transmission device.It avoids in the prior art
Current transformer and transmission device unreasonable allocation, cause ac transmission cable burial in seabed generate parasitic capacitance the technical issues of.
Detailed description of the invention
Below will detailed description of the present invention preferred embodiment by referring to accompanying drawing, make those skilled in the art
Become apparent from above and other feature and advantage of the invention, in attached drawing:
Fig. 1 is offshore high-voltage AC transmission system circuit diagram in the prior art；
Fig. 2 is offshore HVDC transmission system circuit diagram in the prior art；
Fig. 3 is the electrical block diagram of power generation Transmission system in one embodiment of the present invention；
Fig. 4 is the topological structure circuit diagram of offshore wind power generation convertor of the present invention；
Fig. 5 is the electrical block diagram of half-bridge circuit module in one embodiment of the present invention；
Fig. 6 is the electrical block diagram of full-bridge circuit module in one embodiment of the present invention；And
Fig. 7 is the schematic diagram of power generation Transmission system switch protecting circuit structure in one embodiment of the present invention.
Specific embodiment
Embodiment according to the present invention solves matching problem between generator and high voltage power transmission, while meeting skill
Art and double requirements economically.For the prior art, Fig. 1 is offshore high-voltage AC transmission circuit system in the prior art
Schematic diagram, Fig. 2 are offshore HVDC transmission system circuit diagram in the prior art.Scheme as shown in Figure 1, the program
It is a kind of topological circuit similar in land wind power forms of electricity generation, each wind-driven generator 3 or turbine is equipped with traditional
(AC/DC current transformer 100 is by the current transformer of AC to DC, DC/AC unsteady flow for AC/DC current transformer 100 and DC/AC current transformer 200
Device 200 is the current transformer that direct current is switched to exchange).Since the electric current that offshore power generator 3 generates plays pendulum (due to sea
The wind-force and wind speed of wind are in unstable state), therefore can be incited somebody to action by AC/DC current transformer 100 and DC/AC current transformer 200
The frequency stabilization of electric current, and the voltage class wherein exported is improved by the transformer 8 in Fig. 4, is passed through again later
The cable of high-voltage AC transmission accesses power grid 9.After the transformer 8 of one Multiple coil is connect with multiple groups wind-powered electricity generation turbine or generator 3
Being attached again by a transmission system and power grid 9 is usual connection type.For 100 He of AC/DC current transformer in Fig. 1
The topological structure that DC/AC current transformer 200 is formed can be understood as a kind of middle volage current transformer, in addition to this, the mode equivalent with it
It further include three level neutral point clamped converters, Cascade Multilevel Converter, modular multi-level converter etc..Although in figure
Embodiment be a kind of fairly simple directly and to be able to satisfy the embodiment of design requirement.However the problem of this kind of mode, is
The transmission cable connecting with power grid 9 is the high-voltage AC transmission cable for being laid on seabed, therefore can generate parasitic capacitance.In order to keep away
The problem of exempting from parasitic capacitance uses D.C. high voltage transmission, specifically as shown in Fig. 2, the program is another in other design schemes
A high pressure AC/DC current transformer 100 is increased outside, its object is to carry out big function using submarine laying high-voltage dc transmission electrical cables
Rate transmission, this kind of transmission mode are considered relatively reliable.But additional AC/DC current transformer 100 then will increase construction cost and
Occupied area is installed.Therefore, power generation Transmission system provided by the present application, the AC conversion for directly generating generator 3 are height
Straightening galvanic electricity is simultaneously docked with HVDC transmission system.Achieve the effect that technically to reduce or even eliminate parasitic capacitance, together
When also economically substantially reduced cost and reduce installation occupied area.
When specific implementation, Fig. 3 is the electrical block diagram of power generation Transmission system in one embodiment of the present invention, is such as schemed
Shown in 3, offshore wind-powered electricity generation power generation Transmission system provided by the present application includes a generating set, wraps in the generating set
A plurality of generator units 10 are included, this system connects a plurality of generator units 10.Include in generator unit 10
One current transformer 20 and a generator 3.Current transformer 20 is a kind of current transformer that exchange is become to direct current.The system further includes one
High-voltage dc transmission electrical cables 2, high-voltage dc transmission electrical cables 2 include at least a positive power transmission cable 21 and a cathode power transmission cable
22.Wherein, positive power transmission cable 21 and the cathode power transmission cable 22 are one or more, need to be carried out according to specific operating condition
Adjustment.The both ends of positive power transmission cable 21 are connect with the anode of the generating set and a transmission device 300 respectively, cathode transmission of electricity
The both ends of cable 22 are connect with the cathode of generating set and transmission device 300 respectively.In general, transmission device 300 refers to one
A DC/AC current transformer 200, the purpose is to the direct currents for carrying out the conveying of high-voltage dc transmission electrical cables 2 to be converted to alternating current, after convenient
Continued access enters power grid 9.It is well known that power grid 9 generally uses high voltage AC transmission.Certainly, if input voltage not up to accesses electricity
The requirement of net 9, the transmission device 300 is also possible that a transformer 8, for improving voltage class.Present embodiment
System is different from the prior art of Fig. 2.The AC/DC current transformer 100 in Fig. 2 is not used, to reduce construction cost and account for
Ground area.Embodiments of the present invention use high-voltage dc transmission electrical cables 2 simultaneously, have evaded if Fig. 1 is in the prior art using friendship
The technical issues of stream transmission of electricity is easy to produce parasitic capacitance.
Fig. 4 is the topological structure circuit diagram of offshore wind power generation convertor of the present invention.As shown in figure 4, being sent out with one
Electric unit 10 is the topological structure circuit diagram for being illustrated current transformer 20 according to the present invention.Current transformer 20 includes a positive pole
Line 6 and a negative busbar 7, wherein positive bus-bar 6 is direct current outlet anode, and negative busbar 7 is direct current outlet cathode.Current transformer 20 is also
Including two or three series circuit 1, parallel with one another and both ends are connected in positive bus-bar 6 and negative busbar 7, specific real
During applying, specifically two or three series circuits 1 need to be determined according to the number of phases of the generator 3, diphaser
Using two, threephase generator then uses three.Wherein every series circuit 1 includes two inductance 12 and a plurality of electric bridges electricity
Road module 11, two inductance 12 are connected in series, and are provided with connecting pin between two inductance 12, which is exchange outlet
End, which further includes the first bridge circuit module group, is connected between the positive bus-bar 6 and the inductance 12, is wrapped
A plurality of bridge circuit modules 11 and the second bridge circuit module group are included, the negative busbar 7 and the inductance 12 are connected on
Between, including a plurality of bridge circuit modules 11.The bridge circuit of bridge circuit module 11 is full-bridge circuit or half-bridge electricity herein
Road.Positive bus-bar 6 and negative busbar 7 are the anodic potentials and cathode potential of current transformer 20, do not limit to its specific form.Electricity therein
The positive and negative anodes of bridge circuit module 11 are arranged according to the electrode direction of positive bus-bar 6 and negative busbar 7, which belongs to this field skill
The common knowledge of art personnel, details are not described herein.In general, concatenated bridge circuit module between inductance 12 and positive bus-bar 6
Concatenated 11 quantity need of bridge circuit module are identical between 11 and the inductance 12 and negative busbar 7.Reason is referring to base of the present invention
Voltage, curent change relationship in present principles and the course of work, details are not described herein.
In an optional embodiment, bridge circuit module 11 is half-bridge circuit module or full-bridge circuit module.Electric bridge electricity
Road module 11 has two kinds of modular circuit forms that can be substituted for each other.Certainly, as long as meeting circuit topological structure of the present invention needs
The bridge circuit module 11 asked can be used.Present embodiment only specifically provides two kinds of illustrative bridge circuit modules
11 circuit structure.
In an optional embodiment, Fig. 5 is that the circuit structure of bridge circuit module in one embodiment of the present invention shows
It is intended to.As shown in figure 5, half-bridge circuit module includes first capacitor 112 and the first transistor 113 and second transistor 114.
The collector of the first transistor 113 is connect with the anode of first capacitor 112, the emitter of the first transistor 113 and the second crystal
The collector of pipe 114 connects, and the emitter of second transistor 114 is connect with the cathode of first capacitor 112, and half-bridge circuit module is also
Including at least one the first connecting pin 115, the setting of the first connecting pin 115 the first transistor 113 and second transistor 114 it
Between and at least one second connection end 116, the setting of second connection end 116 second transistor 114 and first capacitor 112 it
Between, bridge circuit module 11 is connected in circuit by the first connecting pin 115 with second connection end 116.Present embodiment discloses
The particular circuit configurations of half-bridge circuit module and how by the half-bridge circuit block coupled in series in circuit.
In an optional embodiment, Fig. 6 is that the circuit structure of full-bridge circuit module in one embodiment of the present invention shows
It is intended to.As shown in fig. 6, full-bridge circuit module includes that at least one second capacitor 117 and third transistor 118 and the 4th are brilliant
The anode of body pipe 119, the collector of third transistor 118 and the second capacitor 117 connect, the emitter of third transistor 118 and
The collector of 4th transistor 119 connects, and the emitter of the 4th transistor 119 is connect with the cathode of the second capacitor 117；5th is brilliant
Second electricity is connected in parallel on after body pipe 120 and the 6th transistor 121, the 5th transistor 120 and the series connection of the 6th transistor 121
Holding on 117 positive and negative anodes, the collector of the 5th transistor 120 is connect with the anode of second capacitor 117, and the described 5th
The emitter of transistor 120 is connect with the collector of the 6th transistor 121, the emitter of the 6th transistor 121 with it is described
The cathode of second capacitor 117 connects.At least one third connecting pin 122, third connecting pin 122 are arranged in the third transistor
118 and the 4th between transistor 119.At least one the 4th connecting pin 123, the 4th connecting pin 123 are arranged in the 5th transistor 120
And the 6th between transistor 121, full-bridge circuit module by third connecting pin 122 and the series connection of the 4th connecting pin 123 in circuit.
Present embodiment disclose the full-bridge circuit module particular circuit configurations and how by full-bridge circuit block coupled in series in electricity
Lu Zhong.
In an optional embodiment, in the same generator unit 10, the item number and generator 3 of series circuit 1
The number of phases it is identical.For example, for threephase generator 3, the series circuit 1 different from current transformer 20 connects three of them phase foot 31 respectively
It connects, phase foot 31 is connected on the exchange leading-out terminal of series circuit 1.The current transformer 20 of the present patent application is 3 in diphaser
It is equally applicable.It is two for the series circuit 1 in 3 current transformer 20 of diphaser, connection type and 3 phase of threephase generator
Together, the corresponding item number of series circuit 1 is only adjusted.Present embodiment discloses a kind of generator 3 and series circuit 1
Specific connection type.
In an optional embodiment, Fig. 7 is the Transmission system switch protecting circuit that generates electricity in one embodiment of the present invention
The schematic diagram of structure.As shown in fig. 7, being provided with normally closed switch 4 between generator 3 and current transformer 20, it is located at the current transformer 20
Positive bus-bar 6 and negative busbar 7 between be parallel with normal open switch 5.The switch protecting circuit is used for when generator unit 10 damages,
System can open normally closed switch 4, and at the same time be closed normal open switch 5, so that the generator unit 10 of damage is short-circuited,
And then protect other generator units 10.Other generator units 10 can continue to keep working condition at this time.
In an optional embodiment, normally closed switch 4 is contactor or breaker, and normal open switch 5 is contactor.This implementation
Mode provides the specific electric elements that normally closed switch 4 and normal open switch 5 use.
It is as described above present invention also provides a kind of offshore wind-powered electricity generation power generation Transmission system in an optional embodiment
Power generation Transmission system be applied to offshore wind electrical domain form offshore wind-powered electricity generation power generation Transmission system.Wherein, the generating set
It is set to the sea of offshore, the high-voltage dc transmission electrical cables 2 are embedded in seabed and the transmission device 300 is set to bank
On.A kind of generating set and high-voltage dc transmission electrical cables 2 and the transmission device 300 are provided in the present embodiment mode
Geographical location set-up mode.Current transformer in the prior art and transmission device unreasonable allocation are avoided, causes ac transmission electric
Cable is embedded in the technical issues of seabed generates parasitic capacitance.
Basic principle and the course of work of the invention:
As shown in figure 3, main design thought of the invention is, AC/ in the prior art as shown in Figure 2 is eliminated first
DC current transformer 100.In addition, which employs direct current seabed power transmission modes.This kind of power transmission mode and prior art phase shown in FIG. 1
Than can substantially lower parasitic capacitance, it might even be possible to avoid the generation of parasitic capacitance completely due to using direct current transportation.To sum up
Described, the present invention not only can substantially reduce construction cost and installation land occupation, can also effectively lower or even avoid parasitic capacitance
The problem of.
Specifically, the offshore wind power generation convertor 20 of the application is modular multi-level converter.Fig. 4 is single power generation
The topology diagram of 3 connection type of machine.For the topological features of wherein current transformer 20, more level of bridge circuit module 11
Redundancy Design works in the state of so that current transformer 20 is maintained at low harmony wave disturbance.For the bridge circuit module 11 in each Fig. 4,
A kind of possible circuit topological structure is provided in Fig. 5, specifically, the circuit in bridge circuit module 11 is electric bridge electricity
Road.The bridge circuit can be half-bridge circuit shown in fig. 5, be also possible to full-bridge circuit as shown in FIG. 6.By current transformer 20
The AC conversion that generator 3 is exported is direct current, and voltage class is generally at several kilovolts.(usual 3 kilovolts are pressed in one
The basic standard of generator).
For multiple generators 3, as shown in figure 3, multiple generator units 10, which carry out series connection, meets high voltage direct current
The high pressure level of system.The direct voltage system can generate the high pressure of ten thousand volts or million volts, and specific value depends on hair
The serial number of electric motor units 10.Within the system, each generator unit 10 each contributes to climbing for system voltage.It is each
The voltage that a independent generator unit 10 generates is a specific voltage value, be the advantage is that using multiple generator units
When 10 progress system design, can clearly obtaining its total voltage value, (voltage value for generating independent generator unit 10 is according to number
Amount is added).In addition, the redundancy by coupling control system can be maximized and can be quantified by details.
Generally speaking, the current transformer 20 of the application uses more redundant modules, has each phase of generator 3 all extremely good
Good adaptability.Specifically, if a bridge circuit module 11 is damaged, system if, gets around the bridge circuit module 11
And it still can be in operation at rating.It lets it is assumed that for being at least necessarily provided with N number of electricity on each bridge arm of generator 3
Bridge circuit module 11, and it is provided with M spare redundancy bridge circuit modules 11.For traditional parallel system, if appointed
Bridge circuit module 11 on what bridge arm has to be damaged greater than K, then the voltage of system has to be reduced to original voltage
(N-1)/N times.But for the train of the application, system voltage is only reduced to (M*N-1) of original voltage/M*N times.
The voltage of series system will be higher by much than parallel way, or even when the damage of current transformer 20 is closed and disconnects, system voltage
Still (M-1) of original voltage/M times can be kept, still can be higher than (N-1) of parallel way/N times, which is because, one
As in the case of for it is middle pressure wind power generator unit 10 M > N.
In addition, for each current transformer 20 phase margin more than bridge circuit module 11 can guarantee the voltage etc. of system
Grade.Under extreme case, is damaged unless there are K*M bridge circuit module 11 is more than on a bridge arm, can just be considered influencing
The voltage class of its system.Certain hypothesis be built upon that generator 3 can bear to carry out under conditions of higher voltage (such as
One additional module voltage), but for any current transformer 20 in parallel system, wherein K electric bridge on half of bridge arm
When circuit module 11 damages, system just cannot keep in original voltage class.
It is necessary to it is noted that both the above operational circumstances, which will lead to generator 3, holds current-carrying increase and current transformer
The damage of 20 last points of bridge circuit modules 11.It therefore, should be using more although system voltage still can be kept
The mode of operation of safety, such as reduction system voltage.
In order to open damage generator unit 10 from system break, system can be made to remove using circuit structure as shown in Figure 7
Voltage, which is declined, outer still can work.Specifically, normally closed switch 4 is generally using the contactor of three-phase or open circuit
Device.And normal open switch 5 is generally to use D.C. contactor.4 purpose of normally closed switch is to ensure that system works under normal condition, when normal
Make and break cuts off electric current when closing 4 opening, and normal open switch 5, which is then closed, later makes short circuit, and system then gets around the current transformer of damage
20.Certainly, this is only one of possible protection mechanism.
In conclusion the application's the utility model has the advantages that
Firstly, using HVDC Transmission mode and not needing additionally to increase AC/DC current transformer 100.Secondly, with traditional
Parallel arrangement compares the redundancy with more system-levels.In addition, compared to it is more effective for technical solution shown in Fig. 2
Rate does not need first to convert pressure of continuing rising after the completion of exchange is then converted to direct current simultaneously for direct current.
Based on the purpose for improving system voltage, the multiple raising of generator units 10 voltage class of connecting are right to high pressure level
It can contribute to the voltage class of system in coupling or centralized control, different 20 redundancies of offshore wind power generation convertor.Very
To when one of current transformer 20 is cut off, compared with parallel arrangement, the influence to system voltage is lower.Only one unsteady flow
Device 20 can be completed to dock with high voltage power transmission cable, and efficiency is significantly increased.
The foregoing is merely better embodiments of the invention, are not intended to limit the invention, all of the invention
Within spirit and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. generate electricity Transmission system characterized by comprising
One generating set, the generating set include a plurality of generator units (10), a plurality of generator units (10)
It is connected in series, wherein each generator unit (10) respectively includes a current transformer (20) and one and the current transformer
(20) generator (3) connected；
One high-voltage dc transmission electrical cables (2), the high-voltage dc transmission electrical cables (2) include at least one positive power transmission cable (21) and
One cathode power transmission cable (22), it is described anode power transmission cable (21) both ends respectively with the generating set and a transmission device
(300) anode connection, the both ends of the cathode power transmission cable (22) respectively with the generating set and the transmission device
(300) cathode connection.
2. power generation Transmission system according to claim 1, which is characterized in that the current transformer (20) includes:
One positive bus-bar (6), the positive bus-bar (6) are direct current outlet anode；
One negative busbar (7), the negative busbar (7) are direct current outlet cathode；
Two or three series circuit (1), the two or three series circuit (1) is parallel with one another and both ends are connected to institute
It states on positive bus-bar (6) and negative busbar (7)；
Wherein every series circuit (1) includes:
Two inductance (12), described two inductance (12) are connected in series, and the connecting pin between described two inductance (12) is to hand over
Flow out line end；With
First bridge circuit module group, is connected between the positive bus-bar (6) and the inductance (12), including a plurality of electric bridges
Circuit module (11)；
Second bridge circuit module group, is connected between the negative busbar (7) and the inductance (12), including a plurality of electric bridges
Circuit module (11).
3. power generation Transmission system according to claim 2, which is characterized in that the bridge circuit module (11) is half-bridge electricity
Road module or full-bridge circuit module.
4. power generation Transmission system according to claim 3, which is characterized in that the half-bridge circuit module includes:
At least one first capacitor (112)；With
The first transistor (113) and second transistor (114), the collector of the first transistor (113) and first electricity
Hold the anode connection of (112), the emitter of the first transistor (113) and the collector of the second transistor (114) connect
It connects, the emitter of the second transistor (114) is connect with the cathode of the first capacitor (112)；
At least one first connecting pin (115), first connecting pin (115) setting is in the first transistor (113) and the
Between two-transistor (114)；
At least one second connection end (116), the second connection end (116) are arranged in the second transistor (114) and institute
It states between first capacitor (112), the half-bridge circuit module passes through first connecting pin (115) and second connection end (116)
Series connection is in circuit.
5. power generation Transmission system according to claim 3, which is characterized in that the full-bridge circuit module includes:
At least one second capacitor (117)；With
Third transistor (118) and the 4th transistor (119), the collector of the third transistor (118) and second electricity
Holding the anode connection of (117), the emitter of the third transistor (118) is connect with the collector of the 4th transistor (119), the
The emitter of four transistors (119) is connect with the cathode of second capacitor (117)；
5th transistor (120) and the 6th transistor (121), the 5th transistor (120) and the series connection of the 6th transistor (121)
It is connected in parallel on the positive and negative anodes of second capacitor (117) afterwards, the collector and second capacitor of the 5th transistor (120)
(117) anode connection, the emitter of the 5th transistor (120) is connect with the collector of the 6th transistor (121), described
The emitter of 6th transistor (121) is connect with the cathode of second capacitor (117)；
At least one third connecting pin (122), the third connecting pin (122) setting is in the third transistor (118) and the
Between four transistors (119)；
At least one the 4th connecting pin (123), the 4th connecting pin (123) setting is in the 5th transistor (120) and the
Between six transistors (121), the full-bridge circuit module passes through the third connecting pin (122) and the 4th connecting pin
(123) it connects in circuit.
6. power generation Transmission system according to claim 2, which is characterized in that in the same generator unit (10):
The item number of the series circuit (1) is identical as the number of phases of the generator (3),
Different from the current transformer (20) series circuit (1) connections respectively of the phase foot (31) of the generator (3), wherein
The phase foot (31) is connected on the exchange leading-out terminal of the series circuit (1).
7. power generation Transmission system according to claim 2, which is characterized in that the generator (3) and the current transformer
(20) it is provided between normally closed switch (4), is parallel between the positive bus-bar (6) and negative busbar (7) of the current transformer (20)
Normal open switch (5).
8. power generation Transmission system according to claim 7, which is characterized in that the normally closed switch (4) is contactor or breaks
Road device, the normal open switch (5) are contactor.
9. power generation Transmission system described in any one of -8 according to claim 1, which is characterized in that the power generation Transmission system
For offshore wind-powered electricity generation power generation Transmission system, in which:
The generating set is set to the sea of offshore；
The high-voltage dc transmission electrical cables (2) are embedded in seabed；And
The transmission device (300) is set on the bank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810172202.2A CN110224426A (en) | 2018-03-01 | 2018-03-01 | Generate electricity Transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810172202.2A CN110224426A (en) | 2018-03-01 | 2018-03-01 | Generate electricity Transmission system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204258296U (en) * | 2014-12-11 | 2015-04-08 | 中国计量学院 | Switching magnetic-resistance wind-driven generator direct current exports booster type electrical conversion systems |
| CN104701876A (en) * | 2015-03-18 | 2015-06-10 | 湖南大学 | Topological structure, grid-connected system and control method of offshore wind power plant |
| CN104769804A (en) * | 2013-01-14 | 2015-07-08 | Abb技术有限公司 | Turbine-based energy generation system with DC output |
| CN105790305A (en) * | 2016-04-20 | 2016-07-20 | 清华大学 | Offshore wind power grid connection system based on full-bridge MMC DC-side serial connection and control method thereof |
| CN106712084A (en) * | 2017-01-10 | 2017-05-24 | 清华大学 | Wind power generation system for direct current (DC) series connection of offshore wind farm |
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- 2018-03-01 CN CN201810172202.2A patent/CN110224426A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104769804A (en) * | 2013-01-14 | 2015-07-08 | Abb技术有限公司 | Turbine-based energy generation system with DC output |
| CN204258296U (en) * | 2014-12-11 | 2015-04-08 | 中国计量学院 | Switching magnetic-resistance wind-driven generator direct current exports booster type electrical conversion systems |
| CN104701876A (en) * | 2015-03-18 | 2015-06-10 | 湖南大学 | Topological structure, grid-connected system and control method of offshore wind power plant |
| CN105790305A (en) * | 2016-04-20 | 2016-07-20 | 清华大学 | Offshore wind power grid connection system based on full-bridge MMC DC-side serial connection and control method thereof |
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Application publication date: 20190910 |