CN208571595U - 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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- CN208571595U CN208571595U CN201820467764.5U CN201820467764U CN208571595U CN 208571595 U CN208571595 U CN 208571595U CN 201820467764 U CN201820467764 U CN 201820467764U CN 208571595 U CN208571595 U CN 208571595U
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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 that a kind of dynamic lets out can module, device and DC transmission system, wherein dynamically let out can module include: the first branch and 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；The second branch includes the diode and capacitor being connected in series；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 capacitor；Second resistance is in series 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, improves the resistance of diode branch, largely reduces 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 utility model relates to technical field of direct current power transmission, and in particular to letting out to a kind of dynamic can module, device and direct current
Transmission system.
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 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 is that 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 is closer, and converter 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 connection is relatively weak, if receiving end illusion unsuccessfully causes dc power conveying hair
It is raw temporarily to interrupt, it will lead to the important section of sending end grid parts 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, guaranteeing that system safe and stable operation becomes urgently how after DC transmission system recurs commutation failure
Problem to be solved.
Utility model content
The technical problem to be solved by the present invention is to guarantee system after DC transmission system recurs commutation failure
System safe and stable operation.
The utility model embodiment provides that a kind of dynamic lets out can module, comprising: anode connection terminal and cathode connecting pin, and
Connection is connected to the first branch and second branch between anode connection terminal and cathode connecting pin；The first branch includes being connected in series
First resistor and first switch；Second branch includes the diode and capacitor being connected in series；Between first resistor and first switch
The one end for connecting second switch connects the other end of second switch between diode and capacitor；One in the both ends of diode
Second resistance is in series on end.
Optionally, second resistance is arranged between the anode of diode and anode connection terminal, and/or, second resistance setting
Between the connecting node of the other end of the cathode and capacitor and second switch of diode.
Optionally, second resistance is arranged between the cathode of diode and cathode connecting pin, and/or, second resistance setting
Diode positive electrode capacitance with and second switch the other end connecting node between.
According to second aspect, the utility model embodiment provides that a kind of dynamic lets out can device, comprising: such as above-mentioned first party
The dynamic of face any one is let out can module；Detection module is connect with DC transmission line, for detecting the voltage in DC transmission line
Value or current value；Controlling terminal, respectively with dynamically let out can module and detection module connect, be used for according to voltage value or current value control
Dynamic is let out can module action.
Optionally, controlling terminal includes: first voltage comparator, is connect with detection module, for will test module detection
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, first duration of the first voltage value detected for statistic mixed-state module less than 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 closure, so that dynamic lets out energy module investment DC power transmission line.
Optionally, the first driving unit is connect with first voltage comparator, second for being detected according to detection module
When voltage value is greater than the first preset voltage value, driving first switch and the second switch is disconnected, so that dynamic lets out energy device from direct current
It is cut off in transmission line of electricity.
According to the third aspect, the utility model embodiment provides a kind of DC transmission system, comprising: such as above-mentioned second party
The dynamic of face any one is let out can device；Receiving end, including inverter, connect with DC power transmission line, for turning direct current
Change alternating current into.
Optionally, controlling terminal includes: second voltage comparator, connect, is used for the detection module for dynamically letting out energy device
Second voltage value that module detects be will test compared with the second preset voltage value, obtain the second comparison result；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, be also used to be detected according to detection module
When two voltage values are greater than the second preset voltage value, driving inverter unlock.
Optionally, receiving end further includes smoothing reactor, and the direct current that inverter is arranged in and dynamically lets out between energy device is defeated
In electric line；Dynamic lets out energy device and is also used to cooperate with smoothing reactor so as to flow through the current over-zero of inverter.
Second resistance is in series on one end in the both ends of diode can make second switch conducting electric current smaller, make
It can use regular alternating current breaker, reduce cost, 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.
Detailed description of the invention
Fig. 1 shows the schematic diagram that direct current transportation dynamic in the utility model embodiment lets out energy system；
Fig. 2 shows the topological schematic diagrames that energy device is let out in the utility model embodiment；
Fig. 3 shows another topological schematic diagram for letting out energy device in the utility model embodiment；
Fig. 4 shows DC voltage change schematic diagram in the DC transmission system emulated in the utility model embodiment；
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 provide a kind of dynamic let out can 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 second branch 4；The first branch 3 includes the first resistor R and first switch SW1 being connected in series；Second branch 4
Diode D and capacitor C including series connection；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 capacitor C；Second is in series 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.Capacitor 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 current, capacitor C
Hold, in the present embodiment, capacitor C can also can store electric energy for electric storage device etc., 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 capacitor 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 the second end of capacitor C and 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 capacitor 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 is respectively and just
Pole connecting pin 1 is connected with the first end of capacitor 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 capacitor 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 is arranged in the cathode of diode D and bears
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 working principle that dynamic lets out energy module is described in detail below, when direct current system starts, dynamically lets out electricity in energy module
Hold C charging, enter hot preparation state after the completion of to be charged, it is only necessary to which the electric current of very little maintains capacitor C voltage, basic inactivity damage
Consumption.Direct current system is normally through sending end inverter, DC line, receiving end inverter transmission power to receiving end AC system.In receiving end
When the system failure causes commutation failure, the first switch SW1 and second switch of energy module are dynamically let out in Control protection system starting
SW2 closure, dynamically lets out energy module investment, and receiving end inverter 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 current
It is smaller, allow to reduce cost using regular alternating current breaker, capacitive tank terminates, and the 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 branch, 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 utility model embodiment 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；Controlling terminal 30, respectively with dynamically let out can module and detection module connect, for root
Letting out according to voltage value or current value control dynamic can module action.
In an alternate embodiment of the invention, controlling terminal includes first voltage comparator, is connect with detection module, for will test
The first voltage value that module detects obtains the first comparison result compared with the first preset voltage value；First timing unit, with
The connection of one voltage comparator, first of the first voltage value less than the first preset voltage value detected for statistic mixed-state module are held
Continuous duration；First driving unit is connect with the first timing unit, for driving when the first duration is more than the first preset time
Dynamic first switch and the second switch closure, so that dynamic lets out energy module investment 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 greater than the first preset voltage value, driving first switch and the second switch is disconnected, 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 be can detecte in DC transmission line
Voltage signal also can detecte 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, it is super less than preset value to be greater than preset value or voltage in electric current for the current or voltage of 20 real-time monitoring transmission line of electricity of detection module
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
20 connections, the continuous commutation failure signal that detection module 20 can will test are sent to dynamic and let out energy module 10, and trigger dynamic
State lets out first switch SW1 and second switch the SW2 closure of energy module 10, puts into it in DC power transmission line.In this reality
It applies in example, detection module 20 is also connect with receiving end, and the continuous commutation failure signal that can be will test is sent to receiving end, is driven
Dynamic receiving end inverter locking.
Controlling 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 movement of module 10.In the particular embodiment, controlling terminal 30 can control dynamic
State lets out the investment and excision of energy module 10, and controlling terminal 30 receives detection module 20 and detect by connecting with detection module 20
Continuous commutation failure signal, according to continuous commutation failure signal output for drive investment dynamic let out can module 10 driving letter
Number, controlling 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 driving signal, letting out dynamic can the disengaging DC transmission system of module 10.In the present embodiment, controlling terminal 30, for by
The control receiving end locking of lock-in control signal is exported under the triggering of the continuous commutation failure signal in electric end 100.
In an alternate embodiment of the invention, controlling terminal 30 may include voltage comparator, 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,
Controlling terminal 30 can also include current comparator.Electric current for detecting 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 closure, 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
The comparison result driving first switch SW1 and second switch SW2 that value is greater than preset voltage value is disconnected, 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 greater than preset voltage value in detection module 20
When, indicate line fault removal, transmission line of electricity restores normal, and 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, capacitor C charges, after capacitor C charging complete, DC transmission system
Restore to operate normally.
In an alternate embodiment of the invention, detection module 20 and controlling terminal 30 can be the control system of inverter, detect mould
Block 20 and controlling terminal 30 are arranged in receiving end 100, connect with inverter, and 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 controlling terminal 30
Member is responded when the duration that the voltage value that timing unit counts is less than preset voltage value being more than preset time, drives inverter side
Converter blocking.In the present embodiment, controlling 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 greater than preset voltage value, control
Terminal 30 processed issues unlocking signal, which drives inverter unlock.The voltage value that driving unit is counted in timing unit
When greater than 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 is additionally provided with and the concatenated smoothing reactor of capacitor C, after letting out energy module and putting into DC transmission system, resistance
It quickly being released to dc power, capacitor C can not only provide DC voltage, but also capacitor 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, is latched it reliably.
The utility model provides a kind of DC transmission system, as shown in figure 4, DC transmission system includes: above-mentioned implementation
The dynamic of example description is let out can device 200；Receiving end 100, connect with DC power transmission line, for direct current to be converted into exchanging
Electricity.
In an alternate embodiment of the invention, the controlling terminal for dynamically letting out energy device 200 is also used to be controlled according to comparison result by electricity
The inverter at end executes corresponding movement.Controlling terminal includes: second voltage comparator, with the detection for dynamically letting out energy device 200
Module connection obtains second and compares knot for will test second voltage value that module detects 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
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 also used to according to detection module
When the second voltage value detected is greater 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 also used to cooperate with smoothing reactor so as to flow through the electric current mistake of inverter
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 end, and direct current energy can be converted to alternating current, specifically may include 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 set in receiving end
Direct-flow input end.It can be set 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, which can be carried out, lets out energy.In the particular embodiment, general continuous commutation failure occurs in DC transmission line in direct current transportation
Inverter side, dynamically letting out energy device 200 is controllable device, in route normal transmission, is off working state, is with DC transmission line
Disengaged position is put into DC power transmission line when continuous commutation failure occurs for inverter side, for consuming the straight of rectification side submitting
Galvanic electricity energy, can prevent the important section of sending end grid parts is more than stability limit, part fired power generating unit hypervelocity, Wind turbines because low
Pressure or the extensive off-grid of high pressure.Guarantee 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, specifically may include 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 junior
Power station conveying.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 the other end of the first smoothing reactor 34, the first smoothing reactor 34 with DC transmission line, 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 capacitor C, is generated back-emf for discharging capacitor C, is driven inverse
Become 12 current over-zero of device.Can guarantee that continuous commutation failure is occurring, after letting out in energy device investment DC transmission system, capacitor 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, controlling terminal is generally the control system of inverter to end generally distance, may if energy device investment 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 higher cost, let out can device be mounted on receiving end, can will let out can device directly pass through with controlling terminal and communicate
Cable connection, 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 can comparatively fast make a response and reach scene, to ensure to let out the safe operation of energy device.
DC transmission system in the utility model embodiment is introduced below with reference to emulation experiment to guarantee straight after commutation failure
The principle that stream transmission system is safely and steadily run considers (twice of maximum discharge current by taking 500kV DC transmission system as an example
Rated direct current), the capacity of high-voltage capacitance is set to 100uF, diode high voltage silicon rectifier stack, first switch and the second switch is machine
Tool or IGBT electronic switch, control instruction come 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
Energy device investment 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 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 unlocking signal；Signal two is the signal for disconnecting first switch and the second switch, by first resistor
Circuit 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. 4
DC voltage is 500kV, power 1000MW, sets shunting device capacitor 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, 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 investment lets out energy device,
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 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 direct current system power of sending end can be consumed by resistance R, flow through the dc power of sending end inverter not
Become, not will lead to a large amount of power transfers of sending end AC system, avoid excision generator or oscillation of power, 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, controlling terminal unlocks inverter, lets out energy device with backed off after random, i.e. first switch and the second switch disconnects,
Capacitor charging, direct current system restore 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. a kind of dynamic lets out energy module, comprising: anode connection terminal and cathode connecting pin characterized by comprising
The first branch and 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；
The second branch includes the diode and capacitor being connected in series；
One end that second switch is connected between the first resistor and first switch, connects between the diode and the capacitor
The other end of the second switch；
Second resistance is in series on one end in the both ends of the diode.
2. dynamically letting out energy module as described in claim 1, which is characterized in that the diode is arranged in the second resistance
It is positive between the anode connection terminal, and/or, the second resistance be arranged in the diode cathode and the capacitor and
Between the connecting node of the other end of the second switch.
3. dynamically letting out energy module as described in claim 1, which is characterized in that the diode is arranged in the second resistance
Between cathode and the cathode connecting pin, and/or, the second resistance be arranged in the anode capacitor of the diode with
Between the connecting node of the other end of the second switch.
4. a kind of dynamic lets out energy device characterized by comprising
Dynamic as claimed in any one of claims 1-3 is let out can module；
Detection module is connect with DC transmission line, for detecting voltage value or current value in DC transmission line；
Controlling 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. dynamically letting out as claimed in claim 4 can device, which is characterized in that the controlling 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. dynamically letting out energy device as claimed in claim 5, which is characterized in that
First driving unit is connect with the first voltage comparator, second for being detected according to the detection module
When voltage value is greater 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 characterized by comprising
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 converting direct-current power into alternating-current power.
8. DC transmission system as claimed in claim 7, which is characterized in that the controlling terminal includes:
Second voltage comparator, the detection module for letting out energy device 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, be also used to be detected according to the detection module
When two voltage values are greater 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, the inverter is set and the dynamic let out can be on the DC transmission line road between device；
The dynamic lets out energy device and is also used to cooperate with the smoothing reactor so as to flow through the current over-zero of the inverter.
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| CN201820467764.5U CN208571595U (en) | 2018-04-03 | 2018-04-03 | Dynamic is let out can module, device and DC transmission system |
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| CN201820467764.5U CN208571595U (en) | 2018-04-03 | 2018-04-03 | Dynamic is let out can module, device and DC transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108376977A (en) * | 2018-04-03 | 2018-08-07 | 国家电网有限公司 | Dynamic is let out can module, device and DC transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108376977A (en) * | 2018-04-03 | 2018-08-07 | 国家电网有限公司 | Dynamic is let out can module, device and DC transmission system |
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