CN207442460U - Wind power plant transmission system - Google Patents
Wind power plant transmission system Download PDFInfo
- Publication number
- CN207442460U CN207442460U CN201721668917.4U CN201721668917U CN207442460U CN 207442460 U CN207442460 U CN 207442460U CN 201721668917 U CN201721668917 U CN 201721668917U CN 207442460 U CN207442460 U CN 207442460U
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- transmission system
- power plant
- wind power
- transverter
- plant transmission
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 50
- 230000000670 limiting effect Effects 0.000 claims description 23
- 238000009499 grossing Methods 0.000 claims description 9
- 230000005684 electric field Effects 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Inverter Devices (AREA)
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Abstract
The utility model provides a kind of wind power plant transmission system, and including transverter, current limliting branch, the first diode valve and dc bus, the current limliting branch is in parallel with first diode valve；The dc bus, the current limliting branch in parallel are sequentially connected with the first diode valve and the transverter.When the transverter receives alternating voltage from AC system and alternating voltage is converted to DC voltage is exported, the first diode valve cut-off, so that the dc bus receives the DC voltage that the transverter exports by the current limliting branch；When the dc power that dc bus output slave side converter receives, the first diode valve conducting, the current limliting branch is shorted.Using the wind power plant transmission system of the utility model, direct fault current can be blocked in DC Line Fault, so as to play a protective role.
Description
Technical field
The utility model all things considered is related to technical field of wind power, more particularly, is related to one kind for inhibiting direct current
The wind power plant transmission system of failure.
Background technology
Modularization multi-level converter (Modular Multilevel Converter, MMC) is identical by multiple structures
Submodule (Sub-module, SM) cascade form, the structure of submodule can be divided into half-H-bridge type, full H bridge types and clamp Shuangzi mould
Three kinds of block type.In recent years, modularization multi-level converter has become the preferred transverter topology of flexible direct current power transmission system.
However, when marine wind electric field carries out grid-connected via modularization multi-level converter topology, once DC line is sent out
Raw short trouble, even if all submodules power device pipe in the block is all off, current conversion station by with power device pipe inverse parallel
Diode, still can seriously affect transmission system security performance, it would be highly desirable to improve to trouble point feed-in electric current.
Utility model content
It, can be straight the purpose of this utility model is to provide a kind of for inhibiting the wind power plant transmission system of DC Line Fault
Direct fault current is blocked when flowing failure, so as to play a protective role.
The utility model provides a kind of wind power plant transmission system, and the wind power plant transmission system includes transverter, current limliting branch
Road, the first diode valve and dc bus, the current limliting branch are in parallel with the first diode valve；It is the dc bus, in parallel
The current limliting branch is sequentially connected with the first diode valve and the transverter；Wherein：When the transverter connects from AC system
When receiving alternating voltage and alternating voltage being converted to DC voltage exported, the first diode valve cut-off, so that institute
State the DC voltage that dc bus receives the transverter output by the current limliting branch；When the dc bus exports slave
During the dc power that side converter receives, the first diode valve conducting, the current limliting branch is shorted.
Optionally, the current limliting branch includes current limiting device, wherein, one end connection the described 1st of the current limiting device
The anode of pole pipe valve, the other end of the current limiting device connect the cathode of first diode valve.
Optionally, the current limliting branch further includes the second diode valve, wherein, the anode connection of second diode valve
One end of the current limiting device, the cathode of second diode valve connect the anode of first diode valve；The current limliting
The other end of device connects the cathode of first diode valve.
Optionally, the wind power plant transmission system further includes first switch and resistor, wherein, the first switch and institute
Capacitor in parallel is stated to be connected between the transverter and the AC system；When the transverter starts to convert alternating voltage
When being exported for DC voltage, the first switch is closed.
Optionally, the wind power plant transmission system further includes second switch, wherein, the second switch is connected in parallel connect
Between the first switch and the resistor and the AC system that connect, and when the wind power plant transmission system starts
When, the second switch is closed.
Optionally, when the thermoae limit power of the current limiting device reaches predetermined threshold, the transverter stops will exchange
Voltage conversion is exported for DC voltage, and the second switch disconnects.
Optionally, the wind power plant transmission system further includes smoothing reactor, wherein, one end of the smoothing reactor connects
The other end of the current limiting device is connect, the other end of the smoothing reactor connects the transverter.
Optionally, the wind power plant transmission system further includes converter power transformer, wherein, one end of the converter power transformer connects
The second switch is connect, the other end connects the AC system.
Optionally, when the transverter receives alternating voltage from the AC system and alternating voltage is converted to direct current
When pressure is exported, the second diode valve conducting.
Optionally, the wind power plant transmission system further includes：Controller, wherein, the controller control described first is opened
Close the disconnection with the second switch and closure.
Using the wind power plant transmission system of the utility model, when short trouble occurs for DC line, by DC side simultaneously
Two branches of connection inhibit direct-current short circuit failure, direct fault current can be made to rapidly drop to zero, are protected so as to play
Shield acts on.
Description of the drawings
By the detailed description carried out below in conjunction with the accompanying drawings, above and other objects, features and advantages of the utility model
It will become apparent, wherein：
Fig. 1 shows the circuit diagram of the wind power plant transmission system of one embodiment according to the present utility model.
Fig. 2 shows the circuit diagram of the wind power plant transmission system of another embodiment according to the present utility model.
Specific embodiment
Now, different example embodiments is more fully described with reference to the accompanying drawings, wherein, some exemplary embodiments are attached
It is shown in figure.
The wind power plant transmission system of embodiment according to the present utility model is described referring to Fig. 1 to Fig. 2.
Fig. 1 shows the circuit diagram of the wind power plant transmission system of one embodiment according to the present utility model.
With reference to Fig. 1, the wind power plant transmission system 10 of embodiment according to the present utility model includes：Transverter 100, current limliting branch
Road 200, the first diode valve 300 and dc bus 400.
Here, current limliting branch 200 is in parallel with the first diode valve 300；Dc bus 400, current limliting branch 200 in parallel with
First diode valve 300 and transverter 100 are sequentially connected.Specifically, one end of current limliting branch 200 and the first diode valve 300
Anode connection dc bus 400, the cathode connection transverter of the other end of current limliting branch 200 and the first diode valve 300
100。
Preferably, transverter 100 includes modularization multi-level converter.
When transverter 100 from AC system 500 receive alternating voltage and by alternating voltage be converted to DC voltage carry out it is defeated
When going out, the first diode valve 300 ends, so that dc bus 400 receives what transverter 100 exported by current limliting branch 200
DC voltage.
In other words, transverter 100 connects AC system 500, so as to which AC system 500 is to all submodules of transverter 100
DC capacitor in the block carries out current-limiting charge, and after the voltage stabilization of DC capacitor, transverter 100 exports stable DC
Pressure.In the case, the first diode valve 300 ends, and the DC voltage that transverter 100 exports is passed through current limliting branch 200
Be transmitted to dc bus 400, and then DC voltage is transmitted to pusher side current transformer 600 by dc bus 400 so that wind turbine and its
Pusher side current transformer normally starts.
As an example, DC voltage is transmitted to the draw-out power supply in pusher side current transformer 600 by dc bus 400, when taking energy
When power supply works normally, power for fan power, so that wind turbine and its pusher side current transformer normally start.
It is above-mentioned " transverter 100 from AC system 500 receive alternating voltage and by alternating voltage be converted to DC voltage into
During row output ", when DC Line Fault (for example, DC line generation short trouble) occurs, control transverter 100 closes
Lock, i.e. transverter 100, which stop alternating voltage being converted to DC voltage, to be exported, so as to block direct fault current.
Here, current limliting branch 200 can prevent transverter 100 from crossing to flow through when DC Line Fault (for example, short circuit) occurs
Pressure, plays a protective role.
Preferably, current limliting branch 200 includes current limiting device 210.Specifically, one end connection the one or two of current limiting device 210
The anode of pole pipe valve 300, the other end of current limiting device 210 connect the cathode of the first diode valve 300.
As an example, current limiting device 210 may include：Resistance, dc circuit breaker, wholly-controled device and half control type device.
When dc bus 400 exports the dc power that slave side converter 600 receives, the first diode valve 300 turns on,
Current limliting branch 200 is shorted, and is transmitted so that transverter 100 receives dc bus 400 by the first diode valve 300 of conducting
Dc power, and dc power is converted into AC power and is transferred to AC system 500.
In other words, after wind turbine and its pusher side current transformer normally start, 400 receiver side current transformer 600 of dc bus is defeated
The dc power gone out, in the case, the first diode valve 300 turn on, and the dc power that dc bus 400 transmits is passed through
First diode valve 300 of conducting is transmitted to transverter 100, and then the dc power of reception is converted to exchange by transverter 100
Power, and the AC power being converted to is transmitted to AC system 500, so as to wind power plant transmission system stable operation.It should
Understand, the internal resistance resistance value of the first diode valve 300 is much smaller than the resistance value of current limliting branch 200, therefore, when the first diode valve 300
During conducting, the dc power that dc bus 400 transmits is transmitted to transverter 100 by the first diode valve 300 of conducting.
It is straight when occurring during above-mentioned " dc bus 400 exports the dc power that slave side converter 600 receives "
When flowing failure (for example, DC line generation short trouble), the first diode valve 300 ends, so that direct fault current (example
Such as, direct-current short circuit electric current) zero is rapidly dropped to, it effectively prevents 100 over-voltage and over-current of transverter, plays the role of protection.
Fig. 2 shows the circuit diagram of the wind power plant transmission system of another embodiment according to the present utility model.
With reference to Fig. 2 and with reference to Fig. 1, the current limliting branch 200 of embodiment according to the present utility model further includes：Second diode
Valve 700.
Specifically, one end of the anode connection current limiting device 210 of the second diode valve 700, the moon of the second diode valve 700
Pole connects the anode of the first diode valve 300；The other end of current limiting device 210 connects the cathode of the first diode valve 300.
When transverter 100 from AC system 500 receive alternating voltage and by alternating voltage be converted to DC voltage carry out it is defeated
When going out, the second diode valve 700 turns on, so that dc bus 400 receives what transverter 100 exported by current limiting device 210
DC voltage.
When dc bus 400 exports the dc power that slave side converter 600 receives, the second diode valve 700 ends,
So as to block electric current, energy loss is effectively reduced.
It should be appreciated that the first diode valve 300 includes at least one diode, the second diode valve 700 includes at least one
A diode.Specifically, the first diode valve 300 may include single diode or multiple diodes including being connected in series,
Or multiple diodes including connecting with Hybrid connections in parallel.Similarly, the second diode valve 700 may include single two pole
Manage either multiple diodes including being connected in series or multiple diodes including connecting with Hybrid connections in parallel.Here,
The quantity and model of diode depend on wind power plant transmission system capacity and voltage class, and the utility model is not restricted this.
Wind power plant transmission system 10 further includes：First switch 800 and resistor 900.
First switch 800 and resistor 900 are connected in parallel between transverter 100 and AC system 500, work as first switch
During 800 disconnection, transverter 100 receives alternating voltage by resistor 900 from AC system 500；When transverter 100 starts to hand over
When galvanic electricity pressure is converted to DC voltage and is exported, first switch 800 is closed.
Here, resistor 900 avoids damaging transverter 100 due to charging is too fast for limiting charging current.
Wind power plant transmission system 10 further includes second switch 110.
Second switch 110 is connected between the first switch 800 being connected in parallel and resistor 900 and AC system 500, and
And when wind power plant transmission system 10 starts, second switch 110 is closed.
When the thermoae limit power of current limiting device 210 reaches predetermined threshold, transverter 100 stops being converted to alternating voltage
DC voltage is exported, and second switch 110 disconnects, to cut off discharge line.
Preferably, second switch 110 includes AC circuit breaker.
Wind power plant transmission system 10 further includes：Controller (not shown).
It should be appreciated that controller can control the action of each device in wind power plant transmission system 10.For example, controller control
The disconnection of first switch 800 processed and second switch 110 and closure and, controller control transverter 100 locking, this practicality
It is new that this is not restricted.
Wind power plant transmission system 10 further includes smoothing reactor 120.
The other end of one end connection current limiting device 210 of smoothing reactor 120, the other end connection of smoothing reactor 120
Transverter 100.
Here, smoothing reactor 120 plays the role of limiting electric current, so as to prevent 100 overcurrent-overvoltage of transverter.
Wind power plant transmission system 10 further includes the converter power transformer being connected between second switch 110 and AC system 500
130.For example, one end connection second switch 110 of converter power transformer 130, other end connection AC system 500.
Using the wind power plant transmission system of the embodiment of the utility model, when short trouble occurs for DC line, pass through
Two branches of DC side parallel inhibit direct-current short circuit failure, direct fault current can be made to rapidly drop to zero, from
And it plays a protective role.
Although being particularly shown and describing the utility model with reference to its exemplary embodiment, the technology of this field
Personnel, can be to it should be understood that in the case where not departing from the spirit and scope of the utility model that claim is limited
It carries out various changes of form and details.
Claims (10)
1. a kind of wind power plant transmission system, which is characterized in that the wind power plant transmission system (10) includes transverter (100), limit
Flow branch (200), the first diode valve (300) and dc bus (400), the current limliting branch (200) and the one or two pole
Pipe valve (300) is in parallel；The dc bus (400), the current limliting branch (200) in parallel and the first diode valve (300) and
The transverter (100) is sequentially connected；
Wherein：
When the transverter (100) from AC system (500) receive alternating voltage and by alternating voltage be converted to DC voltage into
During row output, the first diode valve (300) cut-off, so that the dc bus (400) passes through the current limliting branch
(200) DC voltage of transverter (100) output is received；
When the dc power that the dc bus (400) output slave side converter (600) receives, first diode valve
(300) turn on, the current limliting branch (200) is shorted.
2. wind power plant transmission system as described in claim 1, which is characterized in that the current limliting branch (200) includes current limiter
Part (210),
Wherein, one end of the current limiting device (210) connects the anode of first diode valve (300), the current limiting device
(210) the other end connects the cathode of first diode valve (300).
3. wind power plant transmission system as claimed in claim 2, which is characterized in that the current limliting branch (200) further includes second
Diode valve (700),
Wherein, the anode of second diode valve (700) connects one end of the current limiting device (210), the two or two pole
The cathode of pipe valve (700) connects the anode of first diode valve (300)；The other end connection of the current limiting device (210)
The cathode of first diode valve (300).
4. wind power plant transmission system as claimed in claim 3, which is characterized in that the wind power plant transmission system (10) further includes
First switch (800) and resistor (900),
Wherein, the first switch (800) and the resistor (900) are connected in the transverter (100) and the friendship in parallel
Between streaming system (500),
When the transverter (100) starts alternating voltage being converted to DC voltage and be exported, the first switch (800)
It is closed.
5. wind power plant transmission system as claimed in claim 4, which is characterized in that the wind power plant transmission system (10) further includes
Second switch (110),
Wherein, the second switch (110) is connected to the first switch (800) being connected in parallel and the resistor (900)
Between the AC system (500), and when the wind power plant transmission system (10) starts, the second switch (110)
It is closed.
6. wind power plant transmission system as claimed in claim 5, which is characterized in that when the thermoae limit of the current limiting device (210)
When power reaches predetermined threshold, alternating voltage is converted to DC voltage and exported by transverter (100) stopping, and institute
State second switch (110) disconnection.
7. the wind power plant transmission system as described in any one claim in claim 2 to 6, which is characterized in that the wind
Electric field transmission system (10) further includes smoothing reactor (120),
Wherein, one end of the smoothing reactor (120) connects the other end of the current limiting device (210), the flat ripple reactance
The other end of device (120) connects the transverter (100).
8. such as wind power plant transmission system described in claim 5 or 6, which is characterized in that the wind power plant transmission system (10) is also
Including converter power transformer (130),
Wherein, one end of the converter power transformer (130) connects the second switch (110), the other end connection exchange system
It unites (500).
9. wind power plant transmission system as claimed in claim 3, which is characterized in that when the transverter (100) is from the exchange
When system (500) receives alternating voltage and alternating voltage is converted to DC voltage is exported, second diode valve
(700) turn on.
10. wind power plant transmission system as claimed in claim 6, which is characterized in that the wind power plant transmission system (10) is also wrapped
It includes：Controller,
Wherein, the controller controls disconnection and the closure of the first switch (800) and the second switch (110).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721668917.4U CN207442460U (en) | 2017-12-04 | 2017-12-04 | Wind power plant transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721668917.4U CN207442460U (en) | 2017-12-04 | 2017-12-04 | Wind power plant transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207442460U true CN207442460U (en) | 2018-06-01 |
Family
ID=62285542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721668917.4U Active CN207442460U (en) | 2017-12-04 | 2017-12-04 | Wind power plant transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207442460U (en) |
-
2017
- 2017-12-04 CN CN201721668917.4U patent/CN207442460U/en active Active
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