CN207184042U - The controllable energy release device of high-voltage convertor station neutral bus - Google Patents
The controllable energy release device of high-voltage convertor station neutral bus Download PDFInfo
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- CN207184042U CN207184042U CN201721176050.0U CN201721176050U CN207184042U CN 207184042 U CN207184042 U CN 207184042U CN 201721176050 U CN201721176050 U CN 201721176050U CN 207184042 U CN207184042 U CN 207184042U
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Abstract
The utility model discloses a kind of controllable energy release device of high-voltage convertor station neutral bus, the controllable energy release device includes the air gap, controllable shut-off unit；The air gap includes high-field electrode and low-field electrode；Controllable shut-off unit is mainly made up of the energy branch circuit parallel connection ground connection of releasing of two and more than two, releases energy branch route current-limiting resistance and dc circuit breaker is in series, current-limiting resistance electrically connects with low-field electrode, and dc circuit breaker electrically connects with timing control unit.The utility model by setting release can branch road, can effectively suppress neutral bus overvoltage level, so as to shorten the overvoltage duration, reduce arrester and release energy value；And using release can branch road controllable shut-off one by one working method, it is possible to prevente effectively from because wall scroll release can branch road cut off that release can neutral bus overvoltage " multiple to rise " phenomenon for being triggered of electric arc by force.
Description
Technical field
The utility model belongs to technical field of HVDC transmission, is related to the suppression of HVDC converter substation neutral bus overvoltage
Technology processed.
Background technology
In recent years, neutral bus overvoltage Frequent Troubles of HVDC converter substation, serious threat DC transmission system
Safe and stable operation.
At this stage, arrester is the unique channel for discharging neutral bus overvoltage fault energy；However, this release can mode
Problems be present：(1) arrester through-current capability and release can it is limited in one's ability, once exceed its limit value, easily cause arrester oneself
Body damage, blast；(2) by multicolumn arrester parallel way, although its through-current capability can be improved and release energy ability, take
Build higher with maintenance cost；(3) arrester easily makes moist, so as to cause leakage current of an arrester increase, infared spectrum abnormal, exhausted
Edge resistance declines, and causes arrester electric property to be decreased obviously or even be damaged and scraps, and arrester performance detection and operation maintenance
Complex operation, further increase maintenance cost；(4) turn-on and turn-off of arrester depend on the situation of overvoltage, Wu Fashi
It is existing it is controllable, actively exit.
Parallel connection gaps (referenced patent ZL201410716488.8, ZL201510011498.6 etc.) are as the alternative of arrester
Energy release device, the above-mentioned deficiency of arrester can be made up.However, conventional parallel connection gaps are not used as sexupara in DC transmission system
The alternative energy release device of line arrester, main reason is that conventional parallel connection gaps do not possess active arc-suppression function, in neutral bus
Overvoltage exoergic process in, long-time by amplitude DC current, is ultimately caused parallel connection gaps and burnt by parallel connection gaps.
The jet-propelled arc extinguishing parallel connection clearance device that Patent No. ZL201210389771.5 is proposed, although work can be produced quickly
For the high speed and high pressure air-flow of electric arc, so as to suppress electric arc formation and development, it is allowed to extinguish in transient period.But it is this have go out
The parallel connection gaps of arc function are not suitable for the alternative energy release device of DC transmission system neutral bus arrester still, and its reason exists
In：(1) parallel connection gaps carry out arc extinguishing using high velocity air combination arc extinguishing powder, alternating current arc or starting rank to small magnitude
The alternating current arc arc quenching effect of section is preferable, it can be difficult to up to thousands of peaces in cut-out DC transmission system neutral bus exoergic process
Train direct-current arc electric current；(2) parallel connection gaps need to set arc extinguishing powder storeroom, and need to carry out periodic maintenance and supplement, this
The manufacturing cost and later maintenance cost of parallel connection gaps are undoubtedly added, it is not economical and practical；(3) because the parallel connection gaps lean on gas
Arc extinguishing is flowed, the quenching time dispersiveness of air-flow is larger, and easily by Multiple factors such as arc current, background environment, air-flows itself
Influence, therefore the parallel connection gaps arc extinguishing actuation time is not exclusively controllable, and actuation time dispersiveness is larger.
In addition, above-mentioned parallel connection gaps only provide single energy leakage path, once strong in the short time after overvoltage failure
Row cuts off unique energy leakage path, on the contrary neutral bus voltage will be caused to raise again, in gradually can not gently discharging
Sexupara line overvoltage and energy.
Utility model content
The purpose of this utility model is intended to, and is protected for HVDC converter substation neutral bus Overvoltage suppressing in the prior art
Technological deficiency in terms of shield, there is provided a kind of controllable energy release device of neutral bus suitable for HVDC converter substation, can be used as straight
The alternative energy release device of transmission system neutral bus arrester is flowed, with Overvoltage suppressing effect is good, energy of releasing is big, reliability
By force, the advantage such as controllability height.
In order to reach above-mentioned purpose of utility model, the utility model provides a kind of high-voltage convertor station neutral bus realizing controlled-release
Energy device, it is characterised in that including the air gap, controllable shut-off unit；The air gap includes high-field electrode and low tension
Pole；The controllable shut-off unit is mainly made up of the energy branch circuit parallel connection ground connection of releasing of two and more than two, and described release can branch route
Current-limiting resistance and dc circuit breaker are in series, and current-limiting resistance electrically connects with low-field electrode, dc circuit breaker and SECO list
Member electrical connection.
The above-mentioned controllable energy release device of high-voltage convertor station neutral bus, the air gap high-field electrode connect with neutral bus
Connect.When device is in normal operating conditions, the voltage between neutral bus and the earth is born in the air gap.The air gap
Size residual voltage value as corresponding to being connected to neutral bus arrester 50%-90% nominal discharge currents is led to below equation and determined：
Wherein Lg is air gap size, unit mm；Ur is neutral bus arrester 50%-90% nominal discharge currents pair
The residual voltage value answered, unit kV.Arrester is set to may be referred to the conventional design layout that this area has disclosed on neutral bus.
The above-mentioned controllable energy release device of high-voltage convertor station neutral bus, the timing control unit signal input part are released with each
The output end connection of energy branch road dc circuit breaker current measurement signal, signal output part can the actions of branch road dc circuit breaker with each release
Control signal port connects, and timing control unit obtains the electric current of dc circuit breaker, to judge the working condition of dc circuit breaker,
Then according to working condition and built-in control logic output signal, each action for releasing energy branch road dc circuit breaker is controlled,
So as to realize timing control unit to release can branch road the opening and closing of control of dc circuit breaker.
The above-mentioned controllable energy release device of high-voltage convertor station neutral bus, the electric current for acting as preventing releasing energy branch road of current-limiting resistance
It is excessive, to reduce the break performance index request to dc circuit breaker.For the utility model by installing current-limiting resistance additional, releasing can gap
Fault current during conducting can be greatly reduced, and so as to when choosing dc circuit breaker, can select relatively low straight of drop-out current
Breaker is flowed, greatly reduces the cost of dc circuit breaker.The selection principle of current-limiting resistance is ensured needed for dc circuit breaker disconnection
Current value is not higher than 10kA.
The above-mentioned controllable energy release device of high-voltage convertor station neutral bus, when release can branch road it is very few when, in dc circuit breaker by breaking
Open when returning to closure state, a higher overvoltage can be produced, so as to the phenomenon of overvoltage " multiple to rise " occur；When controllable pass
When main at least 4 of the unit that breaks releases energy branch circuit parallel connection ground connection composition, controllable energy release device, which can both reach, releases energy effect, is recovering
During will not also produce the overvoltage of higher magnitude, so as to avoid the phenomenon of overvoltage " multiple to rise ".
The above-mentioned controllable energy release device operation principle of high-voltage convertor station neutral bus is：When device is in normal operating conditions
When, the air gap is off, and dc circuit breaker is in the conduction state, and the air gap is born between neutral bus and the earth
Voltage；After neutral bus overvoltage causes the air gap to puncture, high current can be transferred through current-limiting resistance and direct current interruption
Device, underground is imported, controllable energy release device, which enters, releases energy working condition；Timing control unit comes from dc circuit breaker according to reception
Current signal come judgment means whether enter release can working condition, if device enter release can working condition, break to direct current
Road device sends open command.So as to effectively suppress neutral bus overvoltage level, the energy of releasing of neutral bus arrester is reduced
Value.When controllable energy release device, which has a plurality of parallel connection, releases energy branch road, it can be controlled by timing control unit and release energy branch road one by one,
Can so avoid using wall scroll release can branch road cut off by force release can be caused by electric arc neutral bus overvoltage " multiple to rise " phenomenon.
The utility model is based on the controllable energy release device of high-voltage convertor station neutral bus described above, it is further provided a kind of
It is controllable after neutral bus overvoltage causes the air gap to puncture using the high-voltage convertor station neutral bus realizing controlled-release method
Energy release device is entered by normal operating conditions releases energy working condition, and follows the steps below：
(1) enter from device and release energy working condition experience T1After time, timing control unit releases energy branch road to first
Dc circuit breaker send disconnect release can branch road instruction, first release can branch road dc circuit breaker from State Transferring is turned on to disconnected
Open state；
(2) enter from device and release energy working condition experience T1After+(n-1) the △ t times, timing control unit is released to nth bar
Can branch road dc circuit breaker send disconnect release can branch road instruction, nth bar release can branch road dc circuit breaker from conducting state
Change to off-state；Wherein, n is the integer more than 1；
(3) judge whether that all energy branch roads of releasing disconnect, if all energy branch roads of releasing disconnect, into step (4)；It is if all
Release energy branch road not disconnect entirely, return to step (2), disconnect next and release energy branch road；
(4) can branch road disconnection T from all release2After time, timing control unit to it is all release can branch road dc circuit breakers
The instruction that closure releases energy branch road is sent, all dc circuit breakers for releasing energy branch road are changed to conducting state from off-state, controllable
Energy release device is recovered to normal operating conditions.
Above-mentioned high-voltage convertor station neutral bus realizing controlled-release energy method, when controllable energy release device is in normal operating conditions,
The air gap is off, and dc circuit breaker is in the conduction state.Controllable energy release device is in normal operating conditions still
In energy working condition is released, can be judged by timing control unit；Timing control unit signal input part breaks with direct current
Road device current measurement signal output end connection, signal output part connect with each branch road dc circuit breaker action control signal port
Connecing, timing control unit receives the current measurement signal from dc circuit breaker, and according to the Rule of judgment pre-set, it is determined that
Controllable energy release device is in normal operating conditions and is in releasing energy working condition；Such as timing control unit can set judgement
Condition is：When reception signal shows that dc circuit breaker electric current is less than 1A, controllable energy release device is in normal operating conditions；It is no
Then, controllable energy release device, which is in, releases energy working condition.
Above-mentioned high-voltage convertor station neutral bus realizing controlled-release energy method, T1Time enters for controllable energy release device releases the shape that can work
State, the dc circuit breaker electric signal that receives certainly of timing control unit setting are disconnected (when controllable energy release device bag to energy branch road is released
Containing it is a plurality of release can branch road when, to be released this refers to first can branch road) stand-by period, T1Time can be according to specific high-voltage dc transmission
Electrical engineering is adjusted, typically for 0-3ms；T2Time be timing control unit set from it is all release can branch road disconnect (when
Controllable energy release device include it is a plurality of release can branch road when) to release can branch road closure stand-by period, T2Time can produce according to electric arc
Space charge particle resolution time and release and can determine branch road time for coming into operation again, T2Time cannot set
That puts is too short, and otherwise space charge particle does not dissipate also, easily causes the air gap to puncture again, releases energy gap frequent movement,
Typically in 100ms~10s；When controllable energy release device include it is a plurality of release can branch road when, △ t be adjacent two release can branch road disconnect
Time interval, △ t can be adjusted according to specific high voltage direct current transmission project, and the △ t that the utility model is set are 10-100ms.
Above-mentioned high-voltage convertor station neutral bus realizing controlled-release energy method, in the step (3), all release can the determination methods that disconnect of branch road
For：When n be equal to release can branch travel permit number N, and when all dc circuit breaker electric currents are less than 1A, be determined as it is all release can branch roads break
Open；When n is not equal to energy branch travel permit number N is released, return to step (2), disconnects next and release energy branch road；Energy branch travel permit is released when n is equal to
Number N, but when still thering is the dc circuit breaker electric current to be more than or equal to 1A, illustrate that controllable energy release device has failure, it is necessary to first exclude former
Barrier, then reactivate.
By above-mentioned high-voltage convertor station neutral bus realizing controlled-release energy method, it can not only realize that dc circuit breaker breaks open and close
That closes automatically controls, and solves the technical problem that the air gap can not actively extinguish direct-current arc；And it can be controlled afterwards releasing
Dc circuit breaker closure processed, recovers to device normal operating conditions.
Compared with prior art, the utility model has the advantages that：
1st, the utility model releases energy branch road by setting, can effectively suppress neutral bus overvoltage level, so as to contract
Short across voltage-duration, reduce arrester and release energy value；
2nd, the utility model is connected by using the air gap with releasing the dc circuit breaker of energy branch road, takes full advantage of direct current
Breaker cut-offs the characteristics of direct-current arc ability is strong, job stability is high, can not actively extinguish so as to solve conventional air gap
The technical problem of direct-current arc；
3rd, the utility model by set a plurality of parallel connection release can branch road, using release can branch road controllable shut-off one by one work side
Formula, it is possible to prevente effectively from release energy branch road because of wall scroll cuts off the neutral bus overvoltage released energy electric arc and triggered " multiple to rise " now by force
As；
4th, the utility model is shunted by setting a plurality of parallel connection to release energy branch road to the electric current of breakdown the air gap, from
And reduce the through-current capability requirement and direct current connecting-disconnecting function requirement of dc circuit breaker in exoergic process；
5th, the controllable energy release device of the utility model high-voltage convertor station neutral bus also has reliability height, maintenance cost low
Feature.
Brief description of the drawings
Fig. 1 is the utility model high-voltage convertor station neutral bus realizing controlled-release energy apparatus structure schematic diagram.
Fig. 2 is the utility model high-voltage convertor station neutral bus realizing controlled-release energy method flow schematic diagram.
Fig. 3 is that high-voltage convertor station installs neutral bus overvoltage schematic diagram before and after controllable energy release device additional；Wherein (a) is installation
Before, after (b) is installs additional.
Fig. 4 be the controllable energy release device of high-voltage convertor station neutral bus contain one release can branch road (a) and release energy containing a plurality of
During branch road (b), neutral bus overvoltage schematic diagram.
Wherein, 1, the air gap, 2, high-field electrode, 3, low-field electrode, 4, release can branch road, 5, current-limiting resistance, 6, direct current breaks
Road device, 7, timing control unit, 8, controllable shut-off unit.
Embodiment
The utility model is further described below in conjunction with accompanying drawing：
Embodiment 1
As shown in figure 1, present embodiments provide a kind of controllable energy release device of high-voltage convertor station neutral bus, the realizing controlled-release energy
Device includes the air gap 1 and controllable shut-off unit 8.The air gap includes high-field electrode 2 and low-field electrode 3.Controllable shut-off list
Member 8 include at least 4 release energy branch road 4 and with timing control unit 7.All are released energy branch circuit parallel connection ground connection, and it is by current-limiting resistance 5
In series with dc circuit breaker 6, the parallel connected end of multiple current-limiting resistances electrically connects through wire with low-field electrode 3, and multiple direct currents break
Road device parallel connected end ground connection.Timing control unit signal input part can the output of branch road dc circuit breaker current measurement signal with each release
End connection, signal output part is connected with each energy branch road dc circuit breaker action control signal port of releasing, by timing control unit
Control and each dc circuit breaker for releasing energy branch road is disconnected and closed.
The high-field electrode 2 of the air gap is connected with neutral bus.Under normal operating conditions, neutral bus is born in the air gap
Voltage between the earth.
Air gap size is as the corresponding residual voltage of arrester 50%-90% nominal discharge currents with being connected to neutral bus
The logical below equation of value determines：
Wherein Lg is air gap size, unit mm；Ur is neutral bus arrester 50%-90% nominal discharge currents pair
The residual voltage value answered, unit kV.
Embodiment 2
The high-voltage convertor station neutral bus realizing controlled-release energy apparatus structure that the present embodiment provides is substantially same as Example 1, no
With part be provided only with the present embodiment one release can branch road, release can branch road current-limiting resistance and the air gap low-field electrode
Connection, releases the dc circuit breaker ground connection of energy branch road, and timing control unit signal input part can branch road dc circuit breaker electric current with releasing
Measurement signal output end is connected, and signal output part is connected with releasing energy branch road dc circuit breaker action control signal port, by sequential
Each dc circuit breaker for releasing energy branch road is disconnected for control unit control and closure.
Embodiment 3
The controllable energy release device installation that the present embodiment provides embodiment 1 is with high-voltage convertor station, releasing energy in the present embodiment
Branch road is 5；The distance between size between the air used in the present embodiment, i.e. high-field electrode and low-field electrode are 510mm；This
The timing control unit model STC12C20525 single-chip microcomputers used in embodiment, wherein the electricity of 5 I/O ports and dc circuit breaker
Flow measurement signal output end connects, and 5 I/O ports are connected with dc circuit breaker action control signal port, adopted in the present embodiment respectively
The rated interrupting current of dc circuit breaker is 10kA.
The workflow for the controllable energy release device that this implementation provides is as shown in Fig. 2 comprise the following steps：
S0, original operating state, controllable energy release device is in normal operating conditions when setting initial, wherein at the air gap
In off-state, dc circuit breaker is in closure state；
S1, timing control unit judge that controllable energy release device is in work according to the dc circuit breaker current signal received
State still releases energy working condition, if dc circuit breaker electric current is less than 1A, controllable energy release device is in normal operating conditions, if directly
Stream circuit breaker current is more than or equal to 1A, and controllable energy release device, which is in, releases energy working condition；
S2, enter since controllable energy release device releasing energy working condition through T1Time (T1=0ms) after, timing control unit
The dc circuit breaker for releasing energy branch road to first, which is sent, disconnects the instruction for releasing energy branch road, first dc circuit breaker for releasing energy branch road
From conducting State Transferring to off-state；
S3, enter since controllable energy release device releasing energy working condition through T1+ (n-1) △ t (△ t=15ms) are after the time,
Timing control unit to nth bar release can branch road dc circuit breaker send disconnect release can branch road instruction, nth bar is released can branch road
Dc circuit breaker is from State Transferring is turned on to off-state；Wherein, n is the integer more than 1；
S4, judges whether n meets n=N, if n=N, illustrates that all dc circuit breakers of warp-wise are sent timing control unit
The instruction for releasing energy branch road is disconnected, into step S5, if n ≠ N, return to step S3, next is disconnected and releases energy branch road；
S5, judge whether that all dc circuit breaker electric currents are respectively less than 1A, if so, all energy branch roads of releasing of explanation disconnect, enter
Enter step S6；If it is not, illustrate that controllable energy release device breaks down, it is necessary to be fixed a breakdown into step S7；
S6, timing control unit are released energy branch road from the last item and disconnected again through T2Time (T2=1s) after, timing control unit
Sent to all dc circuit breakers for releasing energy branch road and close the instruction for releasing energy branch road, all dc circuit breakers for releasing energy branch road are autotomyed
Open state is changed to conducting state, and controllable energy release device is recovered to normal operating conditions.
In order to probe into the controllable energy release device of the present embodiment use release can effect, the present embodiment further tests high pressure
Current conversion station neutral bus installs the overvoltage before and after controllable energy release device additional, as a result as shown in figure 3, it can be seen that neutral
After bus installs controllable energy release device additional, neutral bus overvoltage level has obtained effective suppression, when shortening overvoltage persistently
Between, reduce arrester and release energy value.
In order to probe into controllable energy release device it is a plurality of release can release after branch circuit parallel connection can effect, the present embodiment will further release
Can branch road reduce to one (see embodiment 2), and test the over-voltage condition of now neutral bus, as a result as shown in figure 4, from
It can be seen from the figure that, when controllable energy release device only set one release can branch road when, dc circuit breaker disconnect after, neutral bus voltage
It can again raise within a very short time, neutral bus overvoltage " multiple to rise " phenomenon occur；When the setting of controllable energy release device is a plurality of simultaneously
When releasing energy branch road of connection, neutral bus overvoltage " multiple to rise " phenomenon disappears, so as to which centering bus overvoltage level serves very
Good inhibition.In addition, by using a plurality of mode for releasing energy branch circuit parallel connection, direct current interruption in exoergic process can also be reduced
The through-current capability requirement and the requirement of direct current connecting-disconnecting function of device.
One of ordinary skill in the art will be appreciated that embodiment described here is to aid in reader and understands this reality
With new principle, it should be understood that the scope of protection of the utility model is not limited to such especially statement and embodiment.
One of ordinary skill in the art can these technical inspirations according to disclosed in the utility model make and various do not depart from this practicality
New substantive other various specific deformations and combination, these deformations and combination are still in the scope of protection of the utility model.
Claims (5)
1. a kind of controllable energy release device of high-voltage convertor station neutral bus, it is characterised in that including the air gap (1), controllable shut-off list
First (8)；The air gap includes high-field electrode (2) and low-field electrode (3)；The controllable shut-off unit is mainly by two and two
Energy branch road (4) earth of releasing more than bar is formed, and described release can branch route current-limiting resistance (5) and dc circuit breaker (6) series connection
Form, current-limiting resistance electrically connects with low-field electrode, and dc circuit breaker electrically connects with timing control unit (7).
2. the controllable energy release device of high-voltage convertor station neutral bus according to claim 1, it is characterised in that the air gap
Size residual voltage value as corresponding to the arrester 50%-90% nominal discharge currents for being connected to neutral bus is true by below equation
It is fixed：
<mrow>
<msub>
<mi>L</mi>
<mi>g</mi>
</msub>
<mo>=</mo>
<mfrac>
<mn>200</mn>
<mn>109.6</mn>
</mfrac>
<mo>&times;</mo>
<msub>
<mi>U</mi>
<mi>r</mi>
</msub>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mo>.</mo>
</mrow>
Wherein Lg is air gap size, unit mm；Ur is corresponding to neutral bus arrester 50%-90% nominal discharge currents
Residual voltage value, unit kV.
3. the controllable energy release device of high-voltage convertor station neutral bus according to claim 1, it is characterised in that the SECO
Cell signal input with it is each release can branch road dc circuit breaker current measurement signal output end be connected, signal output part with it is each
Releasing can the connection of branch road dc circuit breaker action control signal port.
4. the controllable energy release device of high-voltage convertor station neutral bus according to claim 1, it is characterised in that current-limiting resistance resistance
Satisfaction makes current value needed for dc circuit breaker disconnection be not higher than 10kA.
5. according to the controllable energy release device of high-voltage convertor station neutral bus described in Claims 1-4 any claim, its feature exists
Mainly energy branch circuit parallel connection ground connection is released in the controllable shut-off unit by 4-5 bars to form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721176050.0U CN207184042U (en) | 2017-09-14 | 2017-09-14 | The controllable energy release device of high-voltage convertor station neutral bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721176050.0U CN207184042U (en) | 2017-09-14 | 2017-09-14 | The controllable energy release device of high-voltage convertor station neutral bus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207184042U true CN207184042U (en) | 2018-04-03 |
Family
ID=61747283
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721176050.0U Active CN207184042U (en) | 2017-09-14 | 2017-09-14 | The controllable energy release device of high-voltage convertor station neutral bus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207184042U (en) |
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2017
- 2017-09-14 CN CN201721176050.0U patent/CN207184042U/en active Active
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