CN208674886U - Equipment for inhibiting direct current transportation commutation failure - Google Patents
Equipment for inhibiting direct current transportation commutation failure Download PDFInfo
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- CN208674886U CN208674886U CN201820470119.9U CN201820470119U CN208674886U CN 208674886 U CN208674886 U CN 208674886U CN 201820470119 U CN201820470119 U CN 201820470119U CN 208674886 U CN208674886 U CN 208674886U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model provides a kind of for inhibiting the equipment of direct current transportation commutation failure, comprising: power bypass device is connect with DC transmission line, for bypassing the direct current energy in DC transmission line after the continuous commutation failure of direct current transportation；Detection device is connect with the DC transmission line, for detecting the continuous commutation failure signal in DC transmission line；Controlling terminal is connect with the power bypass device and the detection device respectively, for controlling the power bypass device action according to the continuous commutation failure signal.When the continuous commutation failure of DC transmission system, inverter can not send out the dc power of sending end, controlling terminal controls in power bypass device investment DC transmission system, the dc power of sending end is consumed, more effectively prevent a large amount of power transfers of sending end, the risk for reducing sending end Transient Instability avoids bilateral direct current caused by continuous commutation failure from being latched, and improves the safety and stabilization of system operation.
Description
Technical field
The utility model relates to technical field of direct current power transmission, and in particular to one kind for inhibiting direct current transportation commutation failure
Equipment.
Background technique
As " transferring electricity from the west to the east " strategy is gradually implemented, extra-high voltage direct-current transmission engineering concentration puts into operation, and China is completed the world
The AC-DC hybrid power grid that upper capacity is maximum, topology is most complicated.Ultra-high DC single returns the continuous promotion of transmission capacity, so that
" tetanic weak friendship " feature shows, is mainly reflected in: first is that receiving end power grid is mostly load center, multi-infeed DC drop point is concentrated, respectively
Electrical distance is closer between Inverter Station, and converter station near region fault in ac transmission system may cause multiple-circuit line while commutation failure occurs；
Second is that sending end power grid is energy concentrated area, AC system connection is relatively weak, if inverter side commutation failure causes dc power
Conveying occurs temporarily to interrupt, and will lead to the important section of sending end grid parts more than stability limit, part fired power generating unit hypervelocity, wind-powered electricity generation
Unit seriously threatens system safe and stable operation because of low pressure or the extensive off-grid of high pressure.
For this purpose, how to guarantee DC inversion side recur commutation failure cause inverter side be latched after, rectification side power
It is normal submitting become urgent problem to be solved.
Utility model content
The technical problem to be solved by the present invention is to guarantee DC inversion side recur commutation failure cause it is inverse
After becoming side locking, the normal submitting of rectification side power.
According in a first aspect, the utility model embodiment provide it is a kind of for inhibiting the dress of direct current transportation commutation failure
It sets, comprising: power bypass device is connect with DC transmission line, defeated for bypassing direct current after the continuous commutation failure of direct current transportation
Direct current energy in electric wire；Detection device is connect with the DC transmission line, for detecting the continuous commutation in DC transmission line
Failure signal；Controlling terminal is connect with the power bypass device and the detection device respectively, for continuously being changed according to described
Phase failure signal controls the power bypass device action.
Optionally, the power bypass device includes: controllable switching circuit, for by the power bypass device from described
It puts into or cuts off on DC power transmission line；Energy consumption circuit, the first end in circuit of consuming energy are connect with the controllable switching circuit, are consumed energy
The second end in circuit is connect with DC power transmission line or ground, for consuming the direct current energy of bypass；Voltage support circuit, voltage branch
The first end in support circuit is connect with the controllable switching circuit, and voltage support circuit is connect with the second end in the energy consumption circuit,
Electric energy is stored when for operating normally for the DC transmission system.
Optionally, the controllable switching circuit includes: diode, first switch and the second switch；The anode of diode point
Do not connect with one end of first switch, for being connect with DC power transmission line, the cathode of diode respectively with voltage support circuit
First end connected with one end of second switch, the other end of the other end of first switch and second switch connects, and is connected to
The first end in the energy consumption circuit, the second end in voltage support circuit and the second end ground connection in energy consumption circuit.
Optionally, the controllable switching circuit includes: diode, first switch and the second switch；The first of energy consumption circuit
End is connect with the first end in voltage support circuit respectively, for being connect with DC power transmission line, the second end difference in circuit of consuming energy
It is connect with one end of one end of first switch and second switch, the second end in voltage support circuit is another with first switch respectively
The anode connection at end and diode, the cathode of diode and the other end of second switch are grounded.
Optionally, the continuous commutation failure signal includes voltage value；The controlling terminal includes: voltage comparator, with
The detection device connection, the voltage value for detecting the detection device obtain comparing knot compared with preset voltage value
Fruit；
Timing unit is connect with the detection device and the voltage comparator respectively, for according to the comparison result
Count the duration that the voltage value that the detection device detects is less than the preset voltage value；Driving unit, and it is described fixed
Shi Danyuan connection, for driving the first switch and the second switch to be closed, so that the power bypass device puts into institute
State DC power transmission line.
Optionally, the driving unit is connect with the voltage comparator, for what is detected according to the detection device
The comparison result that voltage value is greater than the preset voltage value drives the first switch and the second switch to disconnect, so that described
Power bypass device is cut off from the DC power transmission line.
Optionally, the controlling terminal is also used to control the inverter movement of the inverter side in DC transmission system.
Optionally, the driving unit is also used to the response when the duration being more than preset time, drives described inverse
Become the converter blocking of side.
Optionally, the voltage value that the driving unit is used to be detected according to the detection device is greater than the predeterminated voltage
The comparison result of value drives the inverter unlock.
Optionally, the inverter side further includes smoothing reactor, and the voltage support circuit is also used in DC power transmission system
Unite continuous commutation failure when electric discharge make to flow through the current over-zero of the inverter with smoothing reactor cooperation.
The device provided by the embodiment of the utility model for being used to inhibit direct current transportation commutation failure, detection device real-time detection
The transmission of electricity situation of DC transmission line, when detecting the continuous commutation failure of DC transmission system, inverter can not send out sending end
Dc power, controlling terminal controls in power bypass device investment DC transmission system, carries out to the dc power of sending end
Consumption more effectively prevents a large amount of power transfers of sending end, reduces the risk of sending end Transient Instability, avoid continuous commutation
The locking of bilateral direct current caused by failure, improves the safety and stabilization of system operation.
Power bypass device provided by the embodiment of the utility model includes controllable switching circuit, is used for the power bypass
Device puts into or cuts off from the DC power transmission line；Consume energy circuit, the first end in circuit of consuming energy and the controllable switching time
Road connection, the second end in circuit of consuming energy are connect with DC power transmission line or ground, for consuming the direct current energy of bypass；Voltage support
Circuit, the first end in voltage support circuit are connect with the controllable switching circuit, voltage support circuit and the energy consumption circuit
Second end connection, stores electric energy when for operating normally for the DC transmission system.Controllable switching circuit can be with quick response
Continuous commutation failure failure in transmission system, and in Failure elimination, it can be cut off rapidly from DC transmission system, not shadow
The normal operation of acoustic system, the voltage that wherein voltage support circuit is stored when system is normal can discharge in system exception,
The DC voltage that DC transmission system can not only be maintained, can also promote inverter current zero passage, then reliable locking.Together
When, power bypass device can cut-off big DC current to avoid using dc switch, save expensive high voltage direct current and cut-off dress
It sets.
Detailed description of the invention
Fig. 1 shows the schematic diagram of equipment of the utility model embodiment for inhibiting direct current transportation commutation failure；
Fig. 2 shows the topological schematic diagrames of the utility model embodiment power bypass device；
Fig. 3 shows another topological schematic diagram of the utility model embodiment power bypass device；
Fig. 4 shows the utility model embodiment for inhibiting showing for controlling terminal in the equipment of direct current transportation commutation failure
It is intended to；
When Fig. 5 shows the utility model embodiment continuous commutation failure in DC transmission system voltage change curve.
Specific embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally
Field those of ordinary skill every other embodiment obtained without making creative work belongs to practical
Novel protected range.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply
Relative importance.
The utility model embodiment provides a kind of for inhibiting the equipment of direct current transportation commutation failure as shown in Figure 1, should
Equipment includes:
Power bypass device 10 is connect with DC transmission line 1, for bypassing after the continuous commutation failure of DC transmission system
Direct current energy in DC transmission line 1.In the particular embodiment, general continuous commutation failure occurs in direct current in direct current transportation
The inverter side of power transmission line, power bypass device 10 can be set in inverter side direct-flow input end, and power bypass device 10 is controllable
Device is off working state in route normal transmission, is disengaged position with DC transmission line 1, is continuously changed in inverter side generation
It mutually when failure, puts into 1 tunnel of DC transmission line, for consuming the direct current energy of rectification side submitting, sending end power grid portion can be prevented
Dividing important section is more than stability limit, part fired power generating unit hypervelocity, Wind turbines because of low pressure or the extensive off-grid of high pressure.Guarantee electricity
The safety of net and generating equipment.
Detection device 20 is connect with DC transmission line 1, for detecting the continuous commutation failure signal in DC transmission line 1.
In this specific embodiment, detection device 20 can detecte the voltage signal in DC transmission line 1, also can detecte direct current
Current signal in power transmission line 1, when commutation failure occurs in DC transmission line 1, under voltage in direct current transportation new 1 is rapid
Drop, electric current rise rapidly, and sporadic commutation failure, inverter side can voluntarily adjust recovery, when continuous commutation failure occurs,
Inverter side is caused to be latched, voltage declines rapidly, and electric current rises rapidly, and continues longer time, and detection device 20 is supervised in real time
The current or voltage for surveying transmission line of electricity, electric current be greater than preset value or voltage be less than preset value be more than for example can be with after preset time
Position 0.5s-2.5s, then can confirmly detect commutation failure signal.In the present embodiment, detection device 20 can also detect directly
Flow the normal signal of power transmission line.
Controlling terminal 30 is connect with power bypass device 10 and detection device 20 respectively, for according to continuous commutation failure
Signal controls power bypass device 10 and acts.In the particular embodiment, controlling terminal 30 can control power bypass device 10
Investment and excision, controlling terminal 30 by connecting with detection device 20, lose by continuous commutation that receiving detection device 20 detects
Signal is lost, according to the output of continuous commutation failure signal for driving the driving signal of investment power bypass device 10, controlling terminal
30 normal signals that can be detected with response detection device 20, the bypass driving signal of output driving power bypass device 10,
Power bypass device 10 is set to be detached from DC transmission system.
The transmission of electricity situation of detection device real-time detection DC transmission line is detecting the continuous commutation failure of DC transmission system
When, inverter can not send out the dc power of sending end, and controlling terminal controls in power bypass device investment DC transmission system,
The dc power of sending end is consumed, a large amount of power transfers of sending end is more effectively prevented, reduces sending end transient state
The risk of unstability avoids bilateral direct current caused by continuous commutation failure from being latched, and improves the safety and stabilization of system operation.
Illustrate the function of power bypass device in conjunction with the specific circuit structure of Fig. 2-power bypass device 10 shown in Fig. 3,
In an alternate embodiment of the invention, power bypass device 10 may include:
Controllable switching circuit 11, for putting into or cutting off power bypass device 10 from DC power transmission line.It consumes energy back
The first end on road 12, energy consumption circuit 12 connect with controllable switching circuit, second end and the DC transmission line 1 in energy consumption circuit 12 or
Ground 2 connects, for consuming the direct current energy of bypass.Voltage support circuit 13, the first end in voltage support circuit 13 and controllable throwing
The connection of switchback road, voltage support circuit 13 are connect with the second end in energy consumption circuit 12, for operating normally for DC transmission system
When store electric energy.In the particular embodiment, controllable switching circuit 11 can be controlled switch, specifically may include diode
D, first switch K1 and second switch K2.Energy consumption circuit 12 can be resistance R, can be first device of the consumption electric energy such as savings battery
Part.Voltage support circuit 13 can be capacitor C, can store electric energy for electric storage device etc., and can discharge the component of electric energy.
In the particular embodiment, the topological structure of power bypass device 10 can be Fig. 2 or shown in Fig. 3 topology knot
Structure, specifically, energy consumption circuit 11 is illustrated by taking resistance R as an example, voltage support circuit 12 is illustrated by taking capacitor C as an example.Such as
Shown in Fig. 2, the anode of diode D is connect with one end of DC transmission line 1 and first switch K1 respectively, the cathode point of diode D
It is not connect with one end of the first end in voltage support circuit 13 and second switch K2, the other end of first switch K1 is opened with second
The other end connection of K2 is closed, and is connected to the first end in energy consumption circuit 12, the second end in voltage support circuit 13 and energy consumption circuit
12 second end ground connection 2.
Fig. 3 shows another topological structure of power bypass device 10, specifically, the first end in energy consumption circuit 11 is respectively and directly
Stream power transmission line 1 connect with the first end in voltage support circuit 13, consume energy 12 second end of circuit respectively with first switch K1` one
End connected with one end of second switch K2, the second end in voltage support circuit 13 respectively with the other end of first switch K1 and two poles
The anode connection of pipe D, the cathode of diode D and the other end ground connection 2 of second switch K2.
It more can explicitly be learnt by Fig. 2 and 10 topological structure of power bypass device shown in Fig. 3, power bypass device
Structure is simple, easily controllable, and engineering adaptability is strong, turns off big DC current compared to reference dc switch, can save a large amount of
Cost.
Controllable switching circuit is for putting into or cutting off power bypass device from DC power transmission line；Energy consumption circuit, consumption
The first end in energy circuit is connect with controllable switching circuit, and the second end in circuit of consuming energy is connect with DC power transmission line or ground, is used for
Consume the direct current energy of bypass；Voltage support circuit, the first end in voltage support circuit are connect with controllable switching circuit, voltage branch
Support circuit is connect with the second end in circuit of consuming energy, and stores electric energy when for operating normally for DC transmission system.Controllable switching returns
Road can be with the continuous commutation failure failure in quick response transmission system, and in Failure elimination, can be from DC transmission system
In cut off rapidly, do not influence the normal operation of system, the voltage that wherein voltage support circuit is stored when system is normal, Ke Yi
It discharges when system exception, can not only maintain the DC voltage of DC transmission system, inverter current zero passage can also be promoted, after
And it is reliably latched.
In an alternate embodiment of the invention, using continuous commutation failure signal as voltage value, if Fig. 4 controlling terminal 30 may include,
Voltage comparator 31 is connect with detection device 20, for will test voltage value that device 12 detects compared with preset voltage value,
Comparison result is obtained, alleged voltage comparator can be single limit comparator, hysteresis loop comparator, window comparator, tri-state comparator
Any one in equal voltage comparators；Timing unit 32 is connect with detection device 20 and voltage comparator 31 respectively, is used for basis
The voltage value that comparison result statistic mixed-state device 20 detects is less than the duration of preset voltage value；Driving unit 33, and it is fixed
The connection of Shi Danyuan 32, for driving first switch K1 and second switch K2 to be closed, so that the investment direct current of power bypass device 10 is defeated
Electric wire 1.
In an alternate embodiment of the invention, as shown in figure 4, driving unit 33 is connect with voltage comparator 31, for according to detection
The comparison result driving first switch K1 and second switch K2 that the voltage value that device 20 arrives is greater than preset voltage value is disconnected, so that
Power bypass device 10 is cut off from DC power transmission line.In the particular embodiment, voltage value is detected in detection device 20
When greater than preset voltage value, indicate line fault removal, transmission line of electricity restores normal, driving unit 33 drive first switch K1 and
Second switch K2 is disconnected, and power bypass device 10 is made to be detached from DC transmission line 1, at this point, capacitor C charges, capacitor C charging complete
Afterwards, DC transmission system restores to operate normally.
In an alternate embodiment of the invention, controlling terminal 30 can be the control system of inverter side, which can basis
Fault-signal (such as continuous commutation failure signal) the control inverter locking of inverter side, can also be in inverter side or direct current transportation
Inverter locking unlock is controlled when route is normal.In the particular embodiment, the driving unit in controlling terminal 30 is single in timing
The duration that the voltage value of 32 statistics of member is less than preset voltage value responds when being more than preset time, drives the inverter of inverter side
Locking.In the present embodiment, controlling terminal 30 is after receiving commutation failure signal, the locking letter of output control inverter locking
Number, which drives inverter locking.When the voltage value that timing unit 32 counts is greater than preset voltage value, controlling terminal
30 issue unlocking signal, which drives inverter unlock.Driving unit 31 is big in the voltage value that timing unit 32 counts
When preset voltage value, driving inverter unlock.
To guarantee that inverter can be reliably latched when continuous commutation failure failure occurs, in an alternate embodiment of the invention,
Inverter side be additionally provided with the concatenated smoothing reactor of capacitor C, after power bypass device is put into DC transmission system,
Resistance quickly releases to dc power, and capacitor C can not only provide DC voltage, but also capacitor can also be put to inverter
Electricity is forced to flow through the current over-zero of inverter, is latched it reliably since the back-emf of smoothing reactor acts on.
The working principle of equipment of the function for inhibiting direct current transportation commutation failure is specifically introduced below with reference to simulation scenarios.
In an inverter side DC line exit power bypass device in parallel, the device by high pressure clamper diode valve and
The controllable switching circuit of mechanical or IGBT electronic switch composition, high-voltage capacitance constitute DC voltage and support circuit, high-power resistance
Energy consumption circuit composition is constituted, working condition can be divided into system start-up phase, inverter side latch stage and system Restoration stage.
By taking 500kV DC transmission system as an example, consider maximum discharge current (twice of rated direct current), by high-voltage capacitance
Capacity be set to 100uF, diode high voltage silicon rectifier stack, first switch and the second switch is mechanical or IGBT electronic switch, control
Instruction comes from controlling terminal.
(1) system start-up phase
In direct current system initial start up phase, first switch and the second switch is disconnected, and diode is by forward dc electricity
Pressure conducting, system is to the capacitor charging in voltage support circuit, until reaching system nominal DC voltage Ud, after charging, directly
Streaming system operates normally.
(2) inverter side latch stage
When inverter side because the reasons such as AC system Voltage Drop, converter valve trigger signal are lost, cause inverter side continuous
Commutation failure.In the present embodiment when reaching default guard time value, it can be counted by timing unit, it is general to choose
0.5-2.5s, controlling terminal will trigger two signals simultaneously: signal one is inverter block signal；Signal two is parallel connection type direct current
Power bypass device puts into signal, is closed first switch and the second switch, power bypass device is put into inverter side AC line
Lu Zhong.At this point, DC capacitor discharges to inverter by first switch and the second switch, due to the work of smoothing reactor back-emf
With being forced to flow through thyristor current flows zero passage, it promoted reliably to be latched.
Simultaneity factor dc power is quickly released through high-power resistance, and DC support capacitor provides DC voltage, sending end
Certain (or specified) power of sustainable conveying, avoids the high-power transfer of sending caused by continuous commutation failure, reduces
The risk of Transient Instability occurs for sending.
(3) system Restoration stage
In system Restoration stage, sending end converter valve is resumed operation first, while controlling terminal issues two signals.Letter
Number one is direct current system inverter side converter valve unlocking signal；Signal two is the signal for disconnecting first switch and the second switch, will be let out
It can resistance loop excision.Forthright voltage maintains near Ud at this time, and direct current system restores normal operating condition quickly.
When Fig. 5 shows continuous commutation failure in DC transmission system voltage change curve, DC transmission system in Fig. 5
DC voltage is 500kV, power 1000MW, sets shunting device capacitor as 100uF, 250 Ω of resistance, DC flat-wave reactor
For 0.5968mH, 5 Ω of DC line all-in resistance；
At the 1st second, direct current system starting, DC voltage rises while starting to charge to capacitor by diode, works as electricity
When pressure is equal to rated direct voltage, charging terminates；
At the 2nd second, the short circuit of 100ms instantaneity three-phase ground occurs for inverter side AC system, and system is restored after fault clearance
Normally；
At the 4th second, AC system voltage drops into 0.3pu from specified 1.0pu, and continuous commutation failure occurs for direct current system
(DC voltage is zero or is less than predeterminated voltage)；
After commutation failure continues 1s (at the 5th second), controlling terminal controls inverter locking, while putting into power bypass dress
It sets, i.e., first switch and the second switch is closed.Shunting device capacitor C passes through first switch and the second switch and flat wave electricity at this time
Anti- device discharges to inverter, and the back-emf that smoothing reactor generates is forced to flow through thyristor current flows zero passage, it is promoted reliably to be latched.
After inverter side change of current valve blocking, the direct current system power of sending end can be consumed by resistance R, flow through the direct current function of sending end inverter
Rate is constant, not will lead to a large amount of power transfers of sending end AC system, avoids excision generator or oscillation of power, maintain sending end
The stabilization of system；
At the 6th second, inverter side AC system voltage is restored to normal 1.0pu from 0.3pu；
At the 7th second, controlling terminal unlocks inverter, with backed off after random power bypass device, i.e. first switch and the second switch
It disconnects, capacitor charging, direct current system restores normal, and dc power is transmitted to inverter side from rectification side again.
Although being described in conjunction with the accompanying the embodiments of the present invention, those skilled in the art can not departed from
Various modifications and variations can be made in the case where the spirit and scope of the utility model, and such modifications and variations are each fallen within by appended
Within claim limited range.
Claims (10)
1. it is a kind of for inhibiting the equipment of direct current transportation commutation failure, it is applied to DC transmission system characterized by comprising
Power bypass device, connect with DC transmission line, for bypassing DC transmission line after the continuous commutation failure of direct current transportation
In direct current energy；
Detection device is connect with the DC transmission line, for detecting the continuous commutation failure signal in DC transmission line；
Controlling terminal is connect with the power bypass device and the detection device respectively, for being lost according to the continuous commutation
It loses signal and controls the power bypass device action.
2. as described in claim 1 for inhibiting the equipment of direct current transportation commutation failure, which is characterized in that the power bypass
Device includes:
Controllable switching circuit, for putting into or cutting off the power bypass device from the DC power transmission line；
Energy consumption circuit, the first end in circuit of consuming energy are connect with the controllable switching circuit, and the second end and direct current in circuit of consuming energy are defeated
Electric line or ground connection, for consuming the direct current energy of bypass；
Voltage support circuit, the first end in voltage support circuit are connect with the controllable switching circuit, voltage support circuit and institute
The second end connection for stating energy consumption circuit, for being lost in continuous commutation to store electric energy when DC transmission system normal operation
The DC voltage of DC transmission system is maintained when losing.
3. as claimed in claim 2 for inhibiting the equipment of direct current transportation commutation failure, which is characterized in that
The controllable switching circuit includes: diode, first switch and the second switch；
The anode of diode is connect with one end of first switch respectively, for being connect with DC power transmission line, the cathode of diode
Connect respectively with one end of the first end in voltage support circuit and second switch, the other end of first switch and second switch it is another
One end connection, and it is connected to the first end in the energy consumption circuit, the second end in voltage support circuit and the second end in energy consumption circuit
Ground connection.
4. as claimed in claim 2 for inhibiting the equipment of direct current transportation commutation failure, which is characterized in that
The controllable switching circuit includes: diode, first switch and the second switch；
The first end in energy consumption circuit is connect with the first end in the voltage support circuit respectively, for connecting with DC power transmission line
It connecing, the second end in circuit of consuming energy is connect with one end of one end of first switch and second switch respectively, and the of voltage support circuit
Two ends are connect with the anode of the other end of first switch and diode respectively, the cathode of diode and another termination of second switch
Ground.
5. the equipment for being used to inhibit direct current transportation commutation failure as described in claim 3 or 4, which is characterized in that
The continuous commutation failure signal includes voltage value；
The controlling terminal includes:
Voltage comparator is connect with the detection device, the voltage value and predeterminated voltage for detecting the detection device
Value compares, and obtains comparison result；
Timing unit is connect with the detection device and the voltage comparator respectively, for being counted according to the comparison result
The voltage value that the detection device detects is less than the duration of the preset voltage value；
Driving unit is connect with the timing unit, for driving the first switch and the second switch to be closed, so that institute
It states power bypass device and puts into the DC power transmission line.
6. as claimed in claim 5 for inhibiting the equipment of direct current transportation commutation failure, which is characterized in that
The driving unit is connect with the voltage comparator, and the voltage value for being detected according to the detection device is greater than institute
The comparison result for stating preset voltage value drives the first switch and the second switch to disconnect, so that the power bypass device
It is cut off from the DC power transmission line.
7. as claimed in claim 6 for inhibiting the equipment of direct current transportation commutation failure, which is characterized in that the controlling terminal
It is also used to control the inverter movement of the inverter side in DC transmission system.
8. as claimed in claim 7 for inhibiting the equipment of direct current transportation commutation failure, which is characterized in that
The driving unit is also used to the response when the duration being more than preset time, drives the inverter of the inverter side
Locking.
9. as claimed in claim 8 for inhibiting the equipment of direct current transportation commutation failure, which is characterized in that
The voltage value that the driving unit is used to be detected according to the detection device is greater than the comparison knot of the preset voltage value
Fruit drives inverter unlock.
10. as claimed in claim 9 for inhibiting the equipment of direct current transportation commutation failure, which is characterized in that the inverter side
It further include smoothing reactor,
The voltage support circuit is also used to discharge in the continuous commutation failure of DC transmission system matches with the smoothing reactor
Close the current over-zero for making to flow through the inverter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820470119.9U CN208674886U (en) | 2018-04-03 | 2018-04-03 | Equipment for inhibiting direct current transportation commutation failure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111245212A (en) * | 2020-03-02 | 2020-06-05 | 华北电力大学 | Thyristor full-bridge energy consumption module for inhibiting LCC-HVDC commutation failure |
| CN114204683A (en) * | 2021-12-13 | 2022-03-18 | 南方电网科学研究院有限责任公司 | Method for detecting direct-current voltage measurement abnormity of extra-high voltage flexible direct-current transmission system |
-
2018
- 2018-04-03 CN CN201820470119.9U patent/CN208674886U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111245212A (en) * | 2020-03-02 | 2020-06-05 | 华北电力大学 | Thyristor full-bridge energy consumption module for inhibiting LCC-HVDC commutation failure |
| CN114204683A (en) * | 2021-12-13 | 2022-03-18 | 南方电网科学研究院有限责任公司 | Method for detecting direct-current voltage measurement abnormity of extra-high voltage flexible direct-current transmission system |
| CN114204683B (en) * | 2021-12-13 | 2023-11-28 | 南方电网科学研究院有限责任公司 | Extra-high voltage flexible direct current transmission system direct current voltage measurement abnormality detection method |
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