CN108376977A - Dynamic is let out can module, device and DC transmission system - Google Patents
Dynamic is let out can module, device and DC transmission system Download PDFInfo
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- CN108376977A CN108376977A CN201810290337.9A CN201810290337A CN108376977A CN 108376977 A CN108376977 A CN 108376977A CN 201810290337 A CN201810290337 A CN 201810290337A CN 108376977 A CN108376977 A CN 108376977A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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]
Abstract
The present invention provides a kind of dynamics to let out energy module, device and DC transmission system, wherein dynamically letting out energy module includes：The first branch and the second branch being connected in parallel between the anode connection terminal and the cathode connecting pin；The first branch includes the first resistor and first switch being connected in series with；The second branch includes the diode and capacitance being connected in series with；One end that second switch is connected between the first resistor and first switch, connects the other end of the second switch between the diode and the capacitance；It is in series with second resistance on one end in the both ends of the diode.Capacitive tank terminates, and the first resistor after receiving end converter blocking is let out in energy link, by the way that second resistance is arranged, is improved the resistance of diode branch, is largely reduced the electric current for flowing through second switch.Allow second switch by regular alternating current circuit breaker trip electric current, while can be misleaded after avoiding diode from turning off by the way that resistance is rationally arranged.
Description
Technical field
The present invention relates to technical field of direct current power transmission, and in particular to being let out to a kind of dynamic can module, device and direct current transportation
System.
Background technology
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 capacity most
Greatly, the most complicated AC-DC hybrid power grid of topology.Ultra-high DC single returns transmission capacity and is constantly promoted so that " tetanic weak friendship " is special
Sign shows, and is mainly reflected in：First, receiving end power grid is mostly load center, more direct currents are burst to be concentrated into drop point, electricity between each Inverter Station
Gas distance is closer, and current conversion station near region fault in ac transmission system may cause multiple-circuit line simultaneously commutation failure occurs；But power transmission
End power grid is energy concentrated area, and AC system contact is relatively weak, if receiving end illusion unsuccessfully causes dc power conveying hair
Raw temporarily to interrupt, will lead to the important section of sending end grid parts 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, system safe and stable operation is seriously threatened.
For this purpose, how after DC transmission system recurs commutation failure, ensure that system safe and stable operation becomes urgently
Problem to be solved.
Invention content
The technical problem to be solved in the present invention is after DC transmission system recurs commutation failure, ensures system peace
Full stable operation.
An embodiment of the present invention provides a kind of dynamics to let out energy module, including：Anode connection terminal and cathode connecting pin, parallel connection is even
The first branch and the second branch being connected between anode connection terminal and cathode connecting pin；The first branch includes first be connected in series with
Resistance and first switch；The second branch includes the diode and capacitance being connected in series with；It is connected between first resistor and first switch
One end of second switch connects the other end of second switch between diode and capacitance；On one end in the both ends of diode
It is in series with second resistance.
Optionally, second resistance is arranged between the anode and anode connection terminal of diode, and/or, second resistance setting
Between the connecting node of the other end of the cathode and capacitance and second switch of diode.
Optionally, second resistance is arranged between the cathode and cathode connecting pin of diode, and/or, second resistance setting
Diode positive electrode capacitance with and second switch the other end connecting node between.
According to second aspect, an embodiment of the present invention provides a kind of dynamics to let out energy device, including：As above-mentioned first aspect is appointed
The dynamic of meaning one is let out can module；Detection module is connect with DC transmission line, for detect voltage value in DC transmission line or
Current value；Control terminal, respectively with dynamically let out can module and detection module connect, for being moved according to voltage value or current value control
State is let out can module action.
Optionally, control terminal includes：First voltage comparator, connect with detection module, for detecting detection module
To the first voltage value compared with the first preset voltage value, obtain the first comparison result；First timing unit, with first voltage ratio
It is connected compared with device, the first voltage value detected for statistic mixed-state module is less than the first duration of the first preset voltage value；
First driving unit is connect with the first timing unit, for driving first when the first duration is more than the first preset time
Switch and second switch are closed, so that dynamic lets out energy module input DC power transmission line.
Optionally, the first driving unit is connect with first voltage comparator, and second for being detected according to detection module
When voltage value is more than the first preset voltage value, driving first switch and the second switch disconnects, so that dynamic lets out energy device from direct current
It is cut off in transmission line of electricity.
According to the third aspect, an embodiment of the present invention provides a kind of DC transmission systems, including：As above-mentioned second aspect is appointed
The dynamic of meaning one is let out can device；Receiving end, including inverter, connect with DC power transmission line, for direct current to be converted into
Alternating current.
Optionally, control terminal includes：Second voltage comparator connect with the detection module for dynamically letting out energy device, is used for
The second voltage value that detection module is detected obtains the second comparison result compared with the second preset voltage value；Second timing mould
Block is connect with second voltage comparator, and the second voltage value detected for statistic mixed-state module is less than the second preset voltage value
The second duration；Second drive module is connect with the second timing unit, for being more than second default in the second duration
Inverter locking is driven when the time.
Optionally, the second drive module is connect with second voltage comparator, is additionally operable to detected according to detection module
When two voltage values are more than the second preset voltage value, driving inverter unlock.
Optionally, receiving end further includes smoothing reactor, be arranged inverter and dynamic let out can be between device direct current it is defeated
In electric line；Dynamic lets out energy device and is additionally operable to coordinate so as to flow through the current over-zero of inverter with smoothing reactor.
Second resistance is in series on one end in the both ends of diode can make second switch conducting electric current smaller, make
Regular alternating current breaker may be used in it, reduces cost, and capacitive tank terminates, and the first resistor after receiving end converter blocking is let out
In energy link, by the way that second resistance is arranged, the resistance of diode branch is improved, the electricity for flowing through second switch is largely reduced
Stream.Allow second switch by regular alternating current circuit breaker trip electric current, while two can be avoided by the way that resistance is rationally arranged
It misleads after pole pipe shutdown.
Description of the drawings
Fig. 1 show the dynamic of direct current transportation in the embodiment of the present invention let out can system schematic diagram；
Fig. 2 shows the topological schematic diagrames that energy device is let out in the embodiment of the present invention；
Fig. 3 shows another topological schematic diagram for letting out energy device in the embodiment of the present invention；
Fig. 4 shows DC voltage change schematic diagram in the DC transmission system emulated in the embodiment of the present invention；
When Fig. 5 shows continuous commutation failure of the embodiment of the present invention in DC transmission system voltage change curve.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work, shall fall within the protection scope of the present invention.
In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply relative importance.
An embodiment of the present invention provides a kind of dynamics to let out energy module, as shown in Figure 1, the module includes：
It anode connection terminal 1 and cathode connecting pin 2 and is connected in parallel between anode connection terminal 1 and cathode connecting pin 2
The first branch 3 and the second branch 4；The first branch 3 includes the first resistor R being connected in series with and first switch SW1；The second branch 4
Including the diode D being connected in series with and capacitance C；One end of second switch SW2 is connected between first resistor R and first switch SW1,
The other end of second switch SW2 is connected between diode D and capacitance C；It is in series with second on one end in the both ends of two pole C pipes
Resistance Ra.
In the particular embodiment, first resistor R may be the component for saving the consumption electric energy such as battery.Capacitance C, by
High-voltage electricity is usually selected in the electric energy of the often high voltage of DC transmission system conveying, such as 500Kv direct currents, capacitance C
Hold, in the present embodiment, capacitance C, which can also be electric storage device etc., can store electric energy, and can discharge the component of electric energy.
In the present embodiment, the topological structure for dynamically letting out energy module can be topological structure shown in fig. 1 or fig. 2, specifically
, as shown in Figure 1, the anode of diode D is connect with one end of anode connection terminal 1 and first switch SW1 respectively, diode D's
Cathode is connect with one end of the first end of capacitance C and second switch SW2 respectively, the other end and second switch of first switch SW1
The other end of SW2 connects, and is connected to the first end of first resistor R, the second end of capacitance C and the second end of first resistor R with
Cathode connecting pin 2 connects.Wherein, Ra is arranged between the anode and anode connection terminal of diode D in second resistance, and, two poles
The cathode and capacitance C of pipe D with and second switch SW2 the other end connecting node between at least one at.
Fig. 2 shows dynamic let out can module 20 another topological structure, specifically, the first end of first resistor R respectively with just
Pole connecting pin 1 is connected with the first end of capacitance C, and the second end of first resistor R is opened with one end of first switch SW1 and second respectively
One end connection of SW2 is closed, the second end of capacitance C is connect with the anode of the other end of first switch SW1 and diode D respectively, and two
The cathode of pole pipe D and the other end cathode connecting pin 2 of second switch SW2.Second resistance Ra be arranged cathode in diode D with it is negative
Between pole connecting pin 2, and, the positive electrode capacitance C of diode D with and second switch SW2 the other end connecting node between
At at least one.
The operation principle that dynamic lets out energy module is described in detail below, when straight-flow system starts, dynamically lets out electricity in energy module
Hold C chargings, enter hot preparation state after the completion of to be charged, it is only necessary to which the electric current of very little maintains capacitance C voltage, basic inactivity damage
Consumption.Straight-flow system is normally through sending end transverter, DC line, receiving end transverter transmission power to receiving end AC system.In receiving end
When the system failure causes commutation failure, Control protection system starts, and dynamically lets out the first switch SW1 and second switch of energy module
SW2 is closed, and dynamically lets out energy module input, and receiving end transverter is latched in current over-zero.By dynamically letting out energy module, the receiving end change of current
Device is reliably latched, and dc power, which all shifts to flow through, lets out energy device, and sending is maintained to stablize.
Second resistance Ra is in series on one end in the both ends of diode C can make second switch SW2 conducting electric currents
Smaller reduces cost so that it can using regular alternating current breaker, and capacitive tank terminates, and after receiving end converter blocking
One resistance R, which is let out, in link, by the way that second resistance Ra is arranged, to improve the resistance of diode D branches, largely reduced and flowed through the
The electric current of two switch SW2.Allow second switch SW2 by regular alternating current circuit breaker trip electric current, while conjunction can be passed through
Reason setting resistance Ra, misleads after avoiding diode from turning off.
The embodiment of the present invention additionally provide a kind of dynamic let out can device, as shown in figure 3, dynamic let out can device include：
The dynamic of above-described embodiment description is let out can module 10；Detection module 20, connect with DC transmission line, straight for detecting
Flow the voltage value or current value in power transmission line；Control terminal 30, respectively with dynamically let out can module and detection module connect, for root
Being let out according to voltage value or current value control dynamic can module action.
In an alternate embodiment of the invention, control terminal includes first voltage comparator, is connect with detection module, for that will detect
The first voltage value that module detects obtains the first comparison result compared with the first preset voltage value；First timing unit, with
One voltage comparator connects, and first of the first voltage value less than the first preset voltage value detected for statistic mixed-state module is held
Continuous duration；First driving unit is connect with the first timing unit, for being driven when the first duration is more than the first preset time
Dynamic first switch and the second switch is closed, so that dynamic lets out energy module input DC power transmission line.
In an alternate embodiment of the invention, the first driving unit is connect with first voltage comparator, for being examined according to detection module
When the second voltage value measured is more than the first preset voltage value, driving first switch and the second switch disconnects, so that dynamic lets out energy
Device is cut off from DC power transmission line.
In an alternate embodiment of the invention, defeated for detecting direct current as shown in figure 3, detection module 20, connect with DC transmission line
Continuous commutation failure signal in electric wire.In this specific embodiment, detection module 20 can detect in DC transmission line
Voltage signal can also detect the current signal in DC transmission line, and when commutation failure occurs in DC transmission line, direct current is defeated
Voltage during electricity is new declines rapidly, and electric current rises rapidly, sporadic commutation failure, and 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 continue it is longer when
Between, detection module 20 monitors the current or voltage of transmission line of electricity in real time, and it is super less than preset value to be more than preset value or voltage in electric current
Cross after preset time for example can position 0.5s-2.5s, then can confirmly detect commutation failure signal.In the present embodiment, it examines
The normal signal of DC transmission line can also be detected by surveying module 20.In the present embodiment, dynamically letting out can module 10 and detection module
The continuous commutation failure signal detected can be sent to dynamic and let out energy module 10 by 20 connections, detection module 20, and be triggered dynamic
The first switch SW1 and second switch SW2 that state lets out energy module 10 are closed, it is made to put into DC power transmission line.In this reality
It applies in example, detection module 20 is also connect with receiving end, the continuous commutation failure signal detected can be sent to receiving end, is driven
Dynamic receiving end inverter locking.
Control terminal 30, respectively with dynamically let out can module 10 and detection module 20 connect, in the present embodiment, for basis
Continuous commutation failure signal control dynamic is let out can the action of module 10.In the particular embodiment, control terminal 30 can control dynamic
State lets out input and the excision of energy module 10, and control terminal 30 receives detection module 20 and detect by being connect with detection module 20
Continuous commutation failure signal, according to continuous commutation failure signal output for drive input dynamic let out can module 10 driving letter
Number, control terminal 30 can also respond the normal signal that detection module 20 detects, output driving dynamic lets out the side of energy module 10
Road drive signal, so that dynamic is let out can the disengaging DC transmission system of module 10.In the present embodiment, control terminal 30, for by
The control receiving end locking of lock-in control signal is exported under the triggering of 100 continuous commutation failure signal of electric end.
In an alternate embodiment of the invention, control terminal 30 may include voltage comparator, be connect with detection module 20, and being used for will
The voltage value that detection module 20 detects obtains comparison result compared with preset voltage value, and alleged voltage comparator can be single
Limit comparator, hysteresis loop comparator, window comparator, any one in the voltage comparators such as tri-state comparator；In the present embodiment,
Control terminal 30 can also include current comparator.Electric current for being detected to detection module 20 compares with pre-set current value
Compared with.Timing unit is connect with detection module 20 and voltage comparator respectively, for being examined according to comparison result statistic mixed-state module 20
The voltage value measured is less than the duration of preset voltage value；Driving unit is connect with timing unit, for driving first switch
SW1 and second switch SW2 are closed, so that dynamic, which lets out energy module 10, puts into DC transmission line.
In an alternate embodiment of the invention, driving unit is connect with voltage comparator, the voltage for being arrived according to detection module 20
Value is disconnected more than comparison result the driving first switch SW1 and second switch SW2 of preset voltage value, can module 10 so as to dynamically let out
It is cut off from DC power transmission line.In the particular embodiment, detect that voltage value is more than preset voltage value in detection module 20
When, indicate that line fault removal, transmission line of electricity restore normal, driving unit drives first switch SW1 and second switch SW2 disconnected
It opens, so that dynamic is let out energy module 10 and be detached from DC transmission line, at this point, capacitance C chargings, after capacitance C charging completes, DC transmission system
Restore normal operation.
In an alternate embodiment of the invention, detection module 20 and control terminal 30 can be the control system of inverter, detect mould
Block 20 and control terminal 30 are arranged in receiving end 100, are connect with inverter, and are connect with energy module 10 is dynamically let out, the control system
System can control inverter locking according to the fault-signal (such as continuous commutation failure signal) of inverter side, can also be in inverter side
Or DC power transmission line it is normal when control inverter locking unlock.In the particular embodiment, the driving list in control terminal 30
The duration that member is less than preset voltage value in the voltage value that timing unit counts responds when being more than preset time, drives inverter side
Converter blocking.In the present embodiment, control terminal 30 is after receiving commutation failure signal, output control inverter locking
Block signal, the block signal drive inverter locking.When the voltage value of timing unit statistics is more than preset voltage value, control
Terminal 30 processed sends out unlocking signal, which drives inverter unlock.The voltage value that driving unit is counted in timing unit
When more than preset voltage value, driving inverter unlock.
To ensure that inverter can be reliably latched when continuous commutation failure failure occurs, in an alternate embodiment of the invention,
Inverter side is additionally provided with and the concatenated smoothing reactors of capacitance C, after letting out energy module and putting into DC transmission system, resistance
It quickly being released to dc power, capacitance C can not only provide DC voltage, but also capacitance can also discharge to inverter,
Since the back-emf of smoothing reactor acts on, it is forced to flow through the current over-zero of inverter, it is made reliably to be latched.
The present invention provides a kind of DC transmission systems, as shown in figure 4, DC transmission system includes：Above-described embodiment is retouched
The dynamic stated is let out can device 200；Receiving end 100, connect with DC power transmission line, is used for converting direct-current power into alternating-current power.
In an alternate embodiment of the invention, the control terminal for dynamically letting out energy device 200 is additionally operable to be controlled by electricity according to comparison result
The inverter at end executes corresponding action.Control terminal includes：Second voltage comparator, with the detection for dynamically letting out energy device 200
Module connects, and the second voltage value for detecting detection module obtains second and compare knot compared with the second preset voltage value
Fruit；Second timing module is connect with second voltage comparator, and the second voltage value detected for statistic mixed-state module is less than the
Second duration of two preset voltage values；Second drive module is connect with the second timing unit, in the second duration
Inverter locking is driven when more than the second preset time.
In an alternate embodiment of the invention, the second drive module is connect with second voltage comparator, is additionally operable to according to detection module
When the second voltage value detected is more than the second preset voltage value, driving inverter unlock.
In an alternate embodiment of the invention, receiving end further includes smoothing reactor, setting inverter and dynamic let out can device it
Between DC transmission line road；Dynamic lets out energy device and is additionally operable to coordinate so as to flow through the electric current mistake of inverter with smoothing reactor
Zero.
Receiving end 100 is mounted on DC transmission line road, is used for converting direct-current power into alternating-current power；In the present embodiment,
Alleged receiving end 100 is direct current energy receiving terminal, and direct current energy can be converted to alternating current, may include specifically changes at different levels
Power station and user terminal substation.
Dynamic lets out energy device 200, is mounted on the direct-flow input end of receiving end, in the continuous commutation failure signal of receiving end
Triggering under put into DC power transmission line, and by sending end direct current energy let out can, in the present embodiment, usual direct current transportation
Between substation or the distance between sending end and receiving end farther out, dynamically let out can device 200 can be arranged in receiving end
Direct-flow input end.It can be arranged between the i.e. straight inverter in position and reactor of dotted line frame mark as shown in Figure 1.Dynamic is let out
Energy device 200 is used to put into DC transmission line under the triggering of the continuous commutation failure signal of receiving end, and sending end 100 is straight
Galvanic electricity can carry out letting out energy.In the particular embodiment, general continuous commutation failure is happened at DC transmission line in direct current transportation
Inverter side, it is controllable device dynamically to let out energy device 200, in circuit normal transmission, is off working state, is with DC transmission line
Disengaged position is put into when continuous commutation failure occurs for inverter side in DC power transmission line, for consuming the straight of rectification side submitting
Galvanic electricity energy can prevent the important section of sending end grid parts more than stability limit, part fired power generating unit hypervelocity, Wind turbines because low
Pressure or the extensive off-grid of high pressure.Ensure the safety of power grid and generating equipment.
In an alternate embodiment of the invention, as shown in figure 4, DC transmission system can also include：Sending end 300, for conveying
Direct current, in the present embodiment, alleged sending end are direct current energy output end, may include specifically thermal power plant's generating equipment
By the direct current energy that rectifier exports, wind power plant passes through the direct current energy of rectifier output, the direct current of solar power generation output
Any one or more in electric energy, in the present embodiment, sending end can also include substation, and alleged substation becomes to subordinate
Power station conveys.In the present embodiment, sending end 300 may include the generating equipment 31 being sequentially connected in series, transformer 32, rectifier 33
It is connect with DC transmission line with the other end of the first smoothing reactor 34, the first smoothing reactor 34, generating equipment 31 generates friendship
Galvanic electricity exports direct current by transformer 32 and rectifier 33.
In an alternate embodiment of the invention, receiving end 100 includes the second smoothing reactor 11 being sequentially connected in series, inverter 12, the
Two transformers 13 and electrical equipment 14.The other end of second smoothing reactor 11 is connect with DC transmission line 1, the second flat wave reactance
Device 11 is connect by first switch SW1 and second switch SW2 with capacitance C, and for generating back-emf to capacitance C electric discharges, driving is inverse
Become 12 current over-zero of device.Can ensure that continuous commutation failure is occurring, after letting out in energy device input DC transmission system, capacitance C
Electric discharge ensures that inverter 12 is reliably latched.
To let out in the present embodiment can device be arranged in receiving end, be the sending end and by electricity due in DC transmission system
Farther out, control terminal is generally the control system of inverter to end generally distance, may if energy device input or excision are let out in control
Communication device is needed to be communicated, it is general to select the communication modes such as fiber optic communication, it may be necessary to be laid with fiber optic cable, not only engineering
Amount is big, and cost is higher, let out can device be mounted on receiving end, can will let out can device directly pass through with control terminal and communicate
Cable connects, and can save fairly large laying fiber optic cable, also, receiving end is generally proximate to city, can device if let out
It breaks down, maintenance personal, which can comparatively fast make a response, reaches scene, to ensure that the safe operation of energy device will be let out.
DC transmission system in the embodiment of the present invention, which is introduced, with reference to emulation experiment ensures that direct current is defeated after commutation failure
The principle for the operation that electrical system safety is stablized considers that (twice specified for maximum discharge current by taking 500kV DC transmission systems as an example
DC current), the capacity of high-voltage capacitance is set to 100uF, diode high voltage silicon rectifier stack, first switch and the second switch be machinery or
IGBT electronic switches, control instruction come from control terminal.
(1) system start-up phase
In straight-flow system initial start up phase, first switch and the second switch disconnects, 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 normal operation.
(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, control terminal will trigger two signals simultaneously：Signal one is inverter block signal；Signal two is parallel connection type direct current
Energy device input signal is let out, first switch and the second switch is closed, energy device will be let out and put into inverter side DC line.This
When, DC capacitor discharges to inverter by first switch and the second switch, due to the effect of smoothing reactor back-emf, forces
Thyristor current flows zero passage is flowed through, it is promoted reliably to be latched.
Simultaneity factor dc power is quickly released through high-power resistance, and DC support capacitance 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 control terminal sends out two signals.Letter
Number one is straight-flow system inverter unlocking signal；Signal two is the signal for disconnecting first switch and the second switch, by first resistor
Circuit is cut off.Forthright voltage maintains near Ud at this time, and straight-flow 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. 4
DC voltage is 500kV, power 1000MW, sets shunting device capacitance as 100uF, 250 Ω of resistance, and DC flat-wave reactor is
0.5968mH, 5 Ω of DC line all-in resistance.
At the 1st second, straight-flow system starts, and DC voltage rises to be started to charge to capacitor by diode simultaneously, works as electricity
When pressure is equal to rated direct voltage, charging terminates.
At the 2nd second, the three-phase ground short circuit of 100ms instantaneitys 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 straight-flow system
(DC voltage is zero or is less than predeterminated voltage).
After commutation failure continues 1s (at the 5th second), control terminal controls inverter locking, while input lets out energy device,
I.e. first switch and the second switch is closed.Shunting device capacitance C passes through first switch and the second switch and flat wave reactance at this time
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.It is inverse
After becoming device locking, the straight-flow system power of sending end can be consumed by resistance R, flow through the dc power of sending end transverter not
Become, a large amount of power transfers of sending end AC system will not be caused, excision generator or oscillation of power is avoided, maintain sending
Stabilization.
At the 6th second, inverter side AC system voltage is restored to normal 1.0pu from 0.3pu.
At the 7th second, control terminal unlocks inverter, and energy device is let out with backed off after random, i.e. first switch and the second switch disconnects,
Capacitor charging, straight-flow system restore normal, and dc power is transmitted to inverter side from rectification side again.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations can be made in the case of bright spirit and scope, and such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (10)
1. a kind of dynamic lets out energy module, including：Anode connection terminal and cathode connecting pin, which is characterized in that including：
The first branch and the second branch being connected in parallel between the anode connection terminal and the cathode connecting pin；
The first branch includes the first resistor and first switch being connected in series with；
The second branch includes the diode and capacitance being connected in series with；
One end that second switch is connected between the first resistor and first switch, connects between the diode and the capacitance
The other end of the second switch；
It is in series with second resistance on one end in the both ends of the diode.
2. as described in claim 1 dynamically let out energy module, which is characterized in that the second resistance is arranged in the diode
It is positive between the anode connection terminal, and/or, the second resistance be arranged cathode in the diode and the capacitance and
Between the connecting node of the other end of the second switch.
3. as described in claim 1 dynamically let out energy module, which is characterized in that the second resistance is arranged in the diode
Between cathode and the cathode connecting pin, and/or, the second resistance be arranged the anode capacitance in the diode with
Between the connecting node of the other end of the second switch.
4. a kind of dynamic lets out energy device, which is characterized in that including：
Dynamic as described in claim 1-3 any one is let out can module；
Detection module is connect with the DC transmission line, for detecting voltage value or current value in DC transmission line；
Control terminal, lets out energy module with the dynamic respectively and the detection module is connect, for according to the voltage value or electricity
Flow valuve controls the dynamic and lets out energy module action.
5. as claimed in claim 4 dynamically let out can device, which is characterized in that the control terminal includes：
First voltage comparator is connect with the detection module, the first voltage value for detecting the detection module with
First preset voltage value compares, and obtains the first comparison result；
First timing unit is connect with the first voltage comparator, the first electricity detected for counting the detection module
Pressure value is less than the first duration of first preset voltage value；
First driving unit is connect with first timing unit, for when first duration is more than first default
Between when drive the first switch and the second switch to be closed so that the dynamic let out can module put into the DC transmission line
Road.
6. as claimed in claim 5 dynamically let out energy device, which is characterized in that
First driving unit is connect with the first voltage comparator, and second for being detected according to the detection module
When voltage value is more than first preset voltage value, the first switch and the second switch is driven to disconnect, so that described dynamic
State is let out energy device and is cut off from the DC power transmission line.
7. a kind of DC transmission system, which is characterized in that including：
Dynamic as described in claim 4-6 any one is let out can device；
Receiving end, including inverter, connect with DC power transmission line, are used for the converting direct-current power into alternating-current power.
8. DC transmission system as claimed in claim 7, which is characterized in that the control terminal includes：
Second voltage comparator, the detection module that energy device is let out with the dynamic is connect, for detecting the detection module
Second voltage value compared with the second preset voltage value, obtain the second comparison result；
Second timing module is connect with the second voltage comparator, the second electricity detected for counting the detection module
Pressure value is less than the second duration of second preset voltage value；
Second drive module is connect with second timing unit, for when second duration is more than second default
Between when drive the inverter to be latched.
9. DC transmission system as claimed in claim 8, which is characterized in that
Second drive module is connect with the second voltage comparator, is additionally operable to detected according to the detection module
When two voltage values are more than second preset voltage value, the inverter is driven to unlock.
10. the DC transmission system as described in claim 7-9 any one, which is characterized in that the receiving end further includes putting down
Wave reactor is arranged on the DC transmission line road that the inverter and the dynamic let out between energy device；
The dynamic lets out energy device and is additionally operable to coordinate so as to flow through the current over-zero of the inverter with the smoothing reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810290337.9A CN108376977A (en) | 2018-04-03 | 2018-04-03 | Dynamic is let out can module, device and DC transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810290337.9A CN108376977A (en) | 2018-04-03 | 2018-04-03 | Dynamic is let out can module, device and DC transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108376977A true CN108376977A (en) | 2018-08-07 |
Family
ID=63031900
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810290337.9A Pending CN108376977A (en) | 2018-04-03 | 2018-04-03 | Dynamic is let out can module, device and DC transmission system |
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| CN202395530U (en) * | 2011-12-30 | 2012-08-22 | 珠海艾派克微电子有限公司 | Charging circuit and charging device |
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| US20140021888A1 (en) * | 2012-07-17 | 2014-01-23 | Fanuc Corporation | Motor driving device including electric storage device |
| CN105449704A (en) * | 2015-12-10 | 2016-03-30 | 特变电工新疆新能源股份有限公司 | Flexible direct current transmission system and direct current fault processing method thereof |
| CN105720612A (en) * | 2016-04-05 | 2016-06-29 | 全球能源互联网研究院 | Power bypass-based inhibition method for commutation failure of high-voltage DC transmission |
| CN208571595U (en) * | 2018-04-03 | 2019-03-01 | 国家电网有限公司 | Dynamic is let out can module, device and DC transmission system |
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2018
- 2018-04-03 CN CN201810290337.9A patent/CN108376977A/en active Pending
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| CN202395530U (en) * | 2011-12-30 | 2012-08-22 | 珠海艾派克微电子有限公司 | Charging circuit and charging device |
| US20140021888A1 (en) * | 2012-07-17 | 2014-01-23 | Fanuc Corporation | Motor driving device including electric storage device |
| CN103501108A (en) * | 2013-10-24 | 2014-01-08 | 深圳威迈斯电源有限公司 | Striking prevention protection circuit for high-voltage direct current power supply circuit and realization method of striking prevention protection circuit |
| CN105449704A (en) * | 2015-12-10 | 2016-03-30 | 特变电工新疆新能源股份有限公司 | Flexible direct current transmission system and direct current fault processing method thereof |
| CN105720612A (en) * | 2016-04-05 | 2016-06-29 | 全球能源互联网研究院 | Power bypass-based inhibition method for commutation failure of high-voltage DC transmission |
| CN208571595U (en) * | 2018-04-03 | 2019-03-01 | 国家电网有限公司 | Dynamic is let out can module, device and DC transmission system |
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Effective date of registration: 20190628 Address after: 100033 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Applicant after: State Grid Corporation of China Applicant after: Global energy Internet Institute, Inc. Applicant after: National Institute of economic and technology research, Jiangsu Electric Power Co., Ltd. Address before: 100033 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Applicant before: State Grid Corporation of China Applicant before: Global energy Internet Institute, Inc. |
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