CN208571594U - Dynamic is let out can device, equipment and DC transmission system - Google Patents
Dynamic is let out can device, equipment and DC transmission system Download PDFInfo
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- CN208571594U CN208571594U CN201820467762.6U CN201820467762U CN208571594U CN 208571594 U CN208571594 U CN 208571594U CN 201820467762 U CN201820467762 U CN 201820467762U CN 208571594 U CN208571594 U CN 208571594U
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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 device, equipment and DC transmission system, wherein dynamically let out can device include: that let out can module for concatenated at least two dynamic between DC transmission line and the first ground wire, dynamic, which is let out, to be provided with first switch between the input terminal and DC transmission line of module, and/or it dynamically lets out and can be provided with first switch between the ground terminal and the first ground wire of module；Concatenated at least two dynamic, which is let out, to connect the second ground wire between module.In the fault clearance of the continuous commutation failure of DC transmission system, disconnect first switch, dynamic can rapidly be cut off and let out energy device, capacitor charging bring system during DC power-supply system restores is avoided to restore slow problem, system more rapidly operation back to normal can be made.Letting out in concatenated dynamic the second ground wire can be arranged between module more can effectively have that reduce system insulation horizontal.
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 device, equipment 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 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 that a kind of dynamic lets out can device, comprising: in DC transmission line
And first concatenated at least two dynamic between ground wire let out can module, dynamically letting out can be between the input terminal and DC transmission line of module
It is provided with first switch, and/or, first switch can be provided between the ground terminal and the first ground wire of module by dynamically letting out；It is concatenated
At least two dynamics, which are let out, to connect the second ground wire between module.
Optionally, dynamically letting out energy device includes that concatenated two dynamics let out energy module；Two dynamics are let out in energy module at least
One dynamic, which is let out, to be provided with second switch between module and the second ground wire.
Optionally, dynamically letting out energy module includes: controllable switching unit, lets out energy device investment direct current transportation for controlling dynamic
Line is cut off from DC transmission line；Energy unit is let out, the first end for letting out energy unit is connect with the first end of controllable switching unit, is used
In consumption direct current energy；Voltage support unit, the first end of voltage support unit are connect with the second end of controllable switching unit, electricity
The second end of support unit is pressed to connect with the second end for letting out energy unit, for providing voltage for inverter side converter blocking.
Optionally, controllable switching unit includes: diode, third switch and the 4th switch；The anode and third of diode
One end of switch, which connects, is used to connect input terminal or ground terminal that dynamic lets out energy module, and the one of the cathode of diode and the 4th switch
End connection, for connecting the first end for letting out energy unit, the other end of third switch is connect with the other end of the 4th switch, for connecting
Connect the first end of voltage support unit.
According to second aspect, the utility model embodiment provide a kind of dynamic let out can equipment, dynamically let out can equipment include:
Dynamic as described in above-mentioned first aspect any one is let out can device；Detection device is connect with DC transmission line, straight for detecting
Flow the operating status of transmission system；Controlling terminal, respectively with dynamically let out can device and detection device connect, for receiving it is former
When hindering clear signal, control first switch is disconnected, so that it is out of service dynamically to let out energy device.
Optionally, controlling terminal is also used to dynamically letting out and device period out of service can control third switch and the 4th switch
It disconnects.
Optionally, controlling terminal is also used to after DC transmission system restores stable state, controls first switch and the second switch
Closure.
Optionally, controlling terminal includes: voltage comparator, is connect with detection device, is detected for will test device
Voltage value obtains comparison result compared with preset voltage value；Drive module is connect with voltage comparator, for according to compare knot
Fruit drives first switch, third switch and the 4th switch to execute corresponding movement.
Optionally, controlling terminal further include: timing module is connect with voltage comparator and drive module respectively, for uniting
The voltage value that meter detection device detects is less than the duration of preset voltage value；Drive module is when duration is more than default
When long, driving third switch and the 4th is closed the switch, so that dynamic lets out energy equipment investment operation.
According to the third aspect, the utility model embodiment provides a kind of DC transmission system, comprising: such as above-mentioned first party
The dynamic of face any one description is let out can equipment；Receiving end is connect with DC power transmission line, for direct current to be converted into exchanging
Electricity.
Optionally, receiving end includes inverter, and controlling terminal is also used to: detecting that continuous commutation, which occurs, loses in detection device
When the operation conditions lost, control inverter locking；When the operation conditions that detection device detects continuous commutation failure is removed, control
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；The voltage support unit that dynamic lets out energy device is used to cooperate with smoothing reactor so as to flow through the electric current mistake of inverter
Zero.
The utility model provide a kind of dynamic let out can device, equipment and DC power-supply system, in DC transmission line and the
Concatenated at least two dynamic lets out energy module between one ground wire, and dynamically letting out can set between the input terminal and DC power transmission line of module
It is equipped with first switch, and/or, first switch can be provided between the ground terminal and the first ground wire of module by dynamically letting out；It is concatenated extremely
Few two dynamics, which are let out, to connect the second ground wire between module.In the fault clearance of the continuous commutation failure of DC transmission system, break
First switch is opened, dynamic can be rapidly cut off and let out energy device, avoid capacitor charging during DC power-supply system restores
Bring system restores slow problem, can make system more rapidly operation back to normal.Letting out in concatenated dynamic can module
Between the second ground wire is set more can effectively have that reduce system insulation horizontal.Energy device is let out using modular, can be subtracted
Few production cost is conducive to large-scale generation, and can be more convenient staff's installation and maintenance in the construction process.
Optionally embodiment, the transmission of electricity situation of detection device real-time detection DC transmission line are detecting that direct current is defeated
When the continuous commutation failure of electric system, inverter can not send out the dc power of sending end, and controlling terminal controls power bypass device
It puts into DC transmission system, the dc power of sending end is consumed, more effectively prevent a large amount of power of sending end from turning
It moves, reduces the risk of sending end Transient Instability, bilateral direct current caused by continuous commutation failure is avoided to be latched, improve system fortune
Capable safety and stabilization.
Detailed description of the invention
The dynamic that Fig. 1 shows the utility model embodiment lets out the schematic diagram of energy device；
Fig. 2 shows the schematic diagrames that the dynamic of the utility model embodiment lets out energy module；
The dynamic that Fig. 3 shows the utility model embodiment lets out the topological schematic diagram of energy module；
The dynamic that Fig. 4 shows the utility model embodiment lets out another topological schematic diagram of energy module；
The dynamic that Fig. 5 shows the utility model embodiment lets out the topological schematic diagram of energy device；
Fig. 6 shows the schematic diagram that the utility model embodiment dynamic lets out energy equipment；
Fig. 7 shows the schematic diagram of the DC transmission system of the utility model embodiment.
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 device, which can be set in DC transmission system
On, when continuous commutation failure occurs for DC transmission system, the direct current energy of sending end is carried out to let out energy, is more effectively prevented
The a large amount of power transfers of sending end, reduce the risk of sending end Transient Instability, avoid bilateral direct current caused by continuous commutation failure
Locking, as shown in Figure 1, this dynamically let out can device include:
Concatenated at least two dynamic lets out energy modules A between DC transmission line and the first ground wire, dynamically lets out energy modules A
First switch K1 is provided between input terminal 1 and DC transmission line, and/or, dynamically let out the ground terminal 2 and the first ground of energy modules A
First switch K1 is provided between line 3；Concatenated at least two dynamic, which is let out, to connect the second ground wire 4 between module.
In the fault clearance of the continuous commutation failure of DC transmission system, first switch is disconnected, can rapidly be cut off dynamic
State lets out energy device, avoids voltage support unit charging bring system recovery is slow during DC power-supply system restores from asking
Topic can make system more rapidly operation back to normal.Also, the second ground wire can be arranged between module by letting out in concatenated dynamic
More can effectively have reduces system insulation level, lets out energy device using modular, it is possible to reduce production cost is conducive to big
The generation of scale, and it can be more convenient staff's installation and maintenance in the construction process.
In optionally embodiment, as shown in Fig. 2, it may include: controllable switching unit 31 that dynamic, which lets out energy modules A, it is used for
Control dynamic is let out energy device investment DC transmission line or is cut off from DC transmission line；Let out can unit 32, let out can unit 32 the
One end is connect with the first end of controllable switching unit 31, for consuming direct current energy；Voltage support unit 33, voltage support unit
33 first end is connect with the second end of controllable switching unit 31, the second end of voltage support unit 33 with let out can unit 32 the
Two ends connection, for providing voltage for inverter side converter blocking.
In the particular embodiment, the inverter side in DC transmission line occurs for general continuous commutation failure in direct current transportation,
Dynamic is let out energy device and be can be set in inverter side direct-flow input end, and dynamically letting out energy device is controllable device, in route normal transmission
When, it is off working state, is disengaged position with DC transmission line, when continuous commutation failure occurs for inverter side, investment direct current is defeated
In electric line, for consuming the direct current energy of rectification side submitting, can prevent the important section of sending end grid parts is more than to stablize pole
Limit, part fired power generating unit hypervelocity, Wind turbines are because of 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, controllable switching unit 31 includes: diode D, the switch of third switch SW1 and the 4th
SW2；The anode of diode D connect the input terminal 1 or ground terminal that energy module is let out for connecting dynamic with one end of second switch SW1
2, the cathode of diode D is connect with one end of the 4th switch SW2, for connecting the first end for letting out energy unit 32, third switch SW1
The other end connect with the second end of the 4th switch SW2, for connecting 32 first end of voltage support unit.
The energy specific circuit structure of device, which is let out, in conjunction with Fig. 3-dynamic shown in Fig. 4 illustrates that dynamic lets out the function of energy device,
In the present embodiment, let out can unit 32 may include resistance R, and can consume direct current energy or store direct current energy device it is equal
Can be used as letting out in this implementation can unit 32.Voltage support unit 33 may include capacitor C, and be capable of the device of energy storage.It is dynamic
State let out can device topological structure can for Fig. 2 or topological structure shown in Fig. 3, specifically, as shown in figure 3, diode D just
Pole is connect with one end of input terminal 1 and third switch SW1 respectively, the cathode of diode D respectively with the first end of capacitor C and
One end of four switch SW2 connects, and the other end of third switch SW1 is connect with the other end of the 4th pass SW2, and is connected to resistance R
First end, the second end of capacitor C and the second end of resistance R are connect with ground terminal 2.In the anode and input terminal 1 of diode D
Between and/or capacitor C second end and resistance R second end and ground terminal 2 between be arranged first switch K1.
Fig. 4 show dynamic lets out can another topological structure of device, specifically, the first end of resistance R respectively with input terminal 1 and
The first end of capacitor C connects, and the second end of resistance R connects with one end of third switch SW1 and one end of the 4th switch SW2 respectively
Connect, the second end of capacitor C connect with the anode of the other end of third switch SW1 and diode D respectively, the cathode of diode D and
The other end ground connection 2 of 4th switch SW2.Between the anode and anode connection terminal 1 of diode D and/or the second end of capacitor C and
First switch K1 is set between the second end and ground terminal 2 of resistance R.
Fig. 5 show the utility model embodiment at least connect dynamic let out can modules A series connection for dynamic let out can device,
In the present embodiment, concatenated quantity can be selected according to actual needs by dynamically letting out energy device, be let out between energy module in multiple dynamics
Connect the second ground wire 4.Second switch K2 is provided between second ground wire 4.Second switch K2 can be synchronous with first switch K1 dynamic
Make, the second ground wire 4 more can significantly reduce system insulation level.
The working principle that dynamic lets out energy device is described in detail below, when direct current system starts, first switch K1 closure, electricity
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 switch of third switch SW1 and the 4th of energy device is dynamically let out in Control protection system starting
SW2 closure, dynamically lets out device investment, and capacitor C and inductance resonant discharge, receiving end inverter are latched in current over-zero.Resistance R
Electric discharge.After fault clearance, first switch K1 is disconnected, device is out of service.If there is no first switch K1, only by disconnecting third
Switch SW1 and the 4th switch SW2 will lead to capacitor C and put into system again, and capacitor C charging, the resume speed of system subtracts
Slowly；Setting first switch K1 can make dynamic let out can device cut off rapidly from DC transmission system.Disconnect first switch K1
Later, energy device period out of service is dynamically let out, then disconnects third switch SW1 and the 4th switch SW2；In DC transmission system
Restore after stablizing, recloses first switch K1, capacitor C charges again, into hot preparation state.
The utility model embodiment additionally provide a kind of dynamic let out can equipment, as shown in fig. 6, dynamic let out can equipment include:
The dynamic of above-described embodiment description is let out can device 10；Detection device 20, connect with DC transmission line, straight for detecting
The operating status for flowing transmission system, may include detect voltage value in DC transmission system, in current value or power at least
One of；Controlling terminal 30, respectively with dynamically let out can device 10 and detection device 20 connect, in the removing of continuous commutation failure
When, control first switch K1 is disconnected, so that it is out of service dynamically to let out energy device.In the particular embodiment, controlling terminal 30 can
With the operating state signal detected according to detection device 20, judge whether the failure of continuous commutation failure is removed, if continuously
The failure of commutation failure is removed, then controls first switch K1 disconnection.Optionally, controlling terminal can receive maintenance personal or by
The fault clearance signal that electric end is sent, to disconnect first switch K1.Controlling terminal 30 be also used to dynamically let out can device 10 exit
Third switch SW1 and the 4th switch SW2 is controlled during operation to disconnect.Controlling terminal 30 is also used to restore steady in DC transmission system
After state, control first switch K1 closure.Capacitor C charges again, into hot preparation state.
Detection device 20, connect with DC transmission line, for detecting the continuous commutation failure signal in DC transmission line.?
In this specific embodiment, detection device 20 can detecte the voltage signal in DC transmission line, also can detecte direct current transportation
Current signal in line, when commutation failure occurs in DC transmission line, the voltage in DC transmission line declines rapidly, and electric current is fast
Speed rises, and sporadic commutation failure, inverter side can voluntarily adjust recovery, when continuous commutation failure occurs, lead to inversion
Side locking, voltage decline rapidly, and electric current rises rapidly, and continues longer time, 20 real-time monitoring power transmission line of detection device
The current or voltage on road, being greater than preset value or voltage in electric current for example can position 0.5s- more than after preset time less than preset value
2.5s can then confirmly detect commutation failure signal.In the present embodiment, detection device 20 can also detect DC transmission line
Normal signal.In the present embodiment, the enlightenment state for dynamically letting out the first switch in energy device is closing device, defeated in direct current
When electric system stable state, first switch is closed state, the capacitor charging of energy device is dynamically let out, into hot preparation state.Dynamic is let out
Energy device 10 is connect with detection device 20, and the continuous commutation failure signal that detection device 20 can will test is sent to dynamic and lets out
Energy device 10, and third switch SW1 and the 4th switch the SW2 closure that dynamic lets out energy device 10 are triggered, so that it is put into direct current defeated
In electric line.In the present embodiment, detection device 20 is also connect with receiving end, the continuous commutation failure letter that can be will test
Number it is sent to receiving end, driving receiving end inverter locking.
Controlling terminal 30, respectively with dynamically let out can device 10 and detection device 20 connect, in the present embodiment, for basis
Continuous commutation failure signal control dynamic is let out can the movement of device 10.In the particular embodiment, controlling terminal 30 can control dynamic
State lets out the investment and excision of energy device 10, and by connecting with detection device 20, receiving detection device 20 detects controlling terminal 30
Continuous commutation failure signal, according to continuous commutation failure signal output for drive investment dynamic let out can device 10 driving letter
Number, the normal signal that controlling terminal 30 can be detected with response detection device 20, output driving dynamic lets out the side of energy device 10
Road driving signal, letting out dynamic can the disengaging DC transmission system of device 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 electric continuous commutation failure signal in end.In the particular embodiment,
Controlling terminal 30 after receiving normal signal that detection device 20 detects or receiving fault clearance signal, open by control first
It closes K1 to disconnect, can rapidly disconnect dynamic and let out energy device, avoid capacitor charging bring system from restoring slow problem, can make
System more rapidly operation back to normal.
In an alternate embodiment of the invention, controlling terminal 30 may include voltage comparator, connect, is used for detection device 20
Voltage value that device 20 detects be will test compared with preset voltage value, obtain comparison result, 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
In, controlling terminal 30 can also include current comparator.Electric current and pre-set current value for being detected to detection device 20 into
Row compares.Timing module is connect with detection device 20 and voltage comparator respectively, for according to comparison result statistic mixed-state device
20 voltage values detected are less than the duration of preset voltage value；Drive module is connect with timing module, for driving third
Switch SW1 and the 4th switch SW2 closure, so that dynamic lets out energy device 10 and puts into DC transmission line.
In an alternate embodiment of the invention, drive module is connect with voltage comparator, the voltage for being arrived according to detection device 20
It is worth the comparison result driving first switch disconnection for being greater than preset voltage value, to disconnect the operation that dynamic lets out energy device 10 rapidly.?
After first switch disconnects, driving device drives third switch SW1 and the 4th switch SW2 to disconnect.In the particular embodiment, exist
When detection device 20 detects that voltage value is greater than preset voltage value, line fault removal is indicated, DC transmission system restores normal
Operation, drive module drives first switch K1 closure, capacitor C is made to charge, and after capacitor C charging complete, dynamically lets out energy device and is in
Hot preparation state.
In an alternate embodiment of the invention, detection device 20 and controlling terminal 30 can be the control system of inverter, detection dress
Set 20 and controlling terminal 30 be arranged in receiving end 100, connect with inverter, and with dynamically let out energy device 10 connect, 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 mould in controlling terminal 30
Block is responded when the duration that the voltage value that timing module 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 module statistics is greater than preset voltage value, control
Terminal 30 processed issues unlocking signal, which drives inverter unlock.The voltage value that drive module is counted in timing module
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 device 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 fig. 7, DC transmission system includes: above-mentioned implementation
The dynamic of example description is let out can equipment 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 equipment 200 is also used to be controlled according to comparison result by electricity
The inverter at end executes corresponding movement.The voltage comparator of controlling terminal connects with the detection device for dynamically letting out energy equipment 200
It connecing, for will test voltage value that device detects compared with preset voltage value, obtaining comparison result；Timing module, with voltage
Comparator connection, the voltage value detected for statistic mixed-state device are less than the second duration of preset voltage value；Drive mould
Block is connect with timing module, for the driving inverter locking when duration is more than preset time.
In an alternate embodiment of the invention, drive module is connect with voltage comparator, is also used to be detected according to detection device
When voltage value is greater than 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 equipment 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 5.Dynamic is let out
Can equipment 200 be used to put into DC transmission line under the triggering of the continuous commutation failure signal of receiving end, and by sending end 100
Direct current energy carries out letting out energy.In the particular embodiment, general continuous commutation failure occurs in DC transmission line in direct current transportation
Inverter side, dynamically let out can equipment 200 be controllable device, in route normal transmission, be off working state, with DC transmission line
It is put into DC power transmission line for disengaged position when continuous commutation failure occurs for inverter side, for consuming rectification side submitting
Direct current energy, can prevent the important section of sending end grid parts be 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 fig. 7, 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 301 being sequentially connected in series, transformer 302, rectifier
303 and first smoothing reactor 304, the other end of the first smoothing reactor 304 connect with DC transmission line, generating equipment 301
Alternating current is generated, direct current is exported by transformer 302 and rectifier 303.
In an alternate embodiment of the invention, receiving end 100 include be sequentially connected in series the second smoothing reactor 101, inverter 102,
Second transformer 103 and electrical equipment 104.The other end of second smoothing reactor 101 is connect with DC transmission line, the second flat wave
Reactor 101 is connect by first switch K1, second switch SW1 and third switch SW2 with capacitor C, for discharging capacitor C
Back-emf is generated, 102 current over-zero of inverter is driven.It can guarantee that continuous commutation failure is occurring, letting out can device investment direct current
After in transmission system, capacitor C electric discharge ensures that inverter 102 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.
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.
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 (12)
1. a kind of dynamic lets out energy device characterized by comprising
Concatenated at least two dynamic lets out energy module between DC transmission line and the first ground wire, and the dynamic lets out the defeated of energy module
Enter and is provided with first switch between end and the DC transmission line, and/or, the dynamic lets out the ground terminal and the first ground of energy module
First switch is provided between line；
Concatenated at least two dynamic, which is let out, to connect the second ground wire between module.
2. dynamically letting out energy device as described in claim 1, which is characterized in that it includes concatenated two that the dynamic, which lets out energy device,
Dynamic is let out can module；
Described two dynamics let out can at least one in module dynamically let out and can be provided with second between module and second ground wire and open
It closes.
3. dynamically letting out energy device as claimed in claim 2, which is characterized in that the dynamic lets out energy module and includes:
Controllable switching unit is let out and device investment DC transmission line or can be cut off from DC transmission line for controlling the dynamic；
Energy unit is let out, the first end for letting out energy unit is connect with the first end of controllable switching unit, for consuming direct current energy；
Voltage support unit, the first end of the voltage support unit are connect with the second end of controllable switching unit, the voltage
The second end of support unit is connect with the second end for letting out energy unit, for providing voltage for inverter side converter blocking.
4. dynamically letting out energy device as claimed in claim 3, which is characterized in that the controllable switching unit includes: diode, the
Three switches and the 4th switch；
The anode of diode is connect with one end of third switch to be let out the input terminal of energy module or described connects for connecting the dynamic
Ground terminal, the cathode of diode are connect with one end of the 4th switch, for connecting the first end for letting out energy unit, third switch
The other end is connect with the other end of the 4th switch, for connecting the first end of the voltage support unit.
5. a kind of dynamic lets out energy equipment, which is characterized in that the dynamic lets out energy equipment and includes:
Dynamically letting out as claimed in claim 4 can device；
Detection device is connect with DC transmission line, for detecting the operating status of DC transmission system；
Controlling terminal, lets out energy device with the dynamic respectively and the detection device is connect, for receiving fault clearance letter
Number when, control the first switch and disconnect so that the dynamic let out can device it is out of service.
6. dynamically letting out energy equipment as claimed in claim 5, which is characterized in that the controlling terminal is also used to let out in the dynamic
The third switch can be controlled device period out of service and the 4th switch disconnects.
7. dynamically letting out energy equipment as claimed in claim 6, which is characterized in that
The controlling terminal is also used to after the DC transmission system restores stable state, controls the first switch and described second
It closes the switch.
8. dynamic as claimed in claims 6 or 7 is let out can equipment, which is characterized in that 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；
Drive module is connect with the voltage comparator, for driving the first switch, the third to open according to comparison result
It closes and the 4th switch executes corresponding movement.
9. dynamically letting out energy equipment as claimed in claim 8, which is characterized in that the controlling terminal further include: timing module, point
It is not connect with the voltage comparator and the drive module, is less than institute for counting the voltage value that the detection device detects
State the duration of preset voltage value；
The drive module drives the third switch and the 4th switch to close when the duration is more than preset duration
It closes, so that the dynamic lets out energy equipment investment operation.
10. a kind of DC transmission system characterized by comprising
Dynamic as described in claim 5-9 any one is let out can equipment；
Receiving end is connect with DC power transmission line, is used for converting direct-current power into alternating-current power.
11. DC transmission system as claimed in claim 10, which is characterized in that the receiving end includes inverter, the control
Terminal processed is also used to:
When the detection device detects the operation conditions that continuous commutation failure occurs, the inverter locking is controlled；
When the operation conditions that the detection device detects the continuous commutation failure is removed, the inverter unlock is controlled.
12. DC transmission system as claimed in claim 11, which is characterized in that the receiving end further includes smoothing reactor,
The inverter is set and the dynamic let out can be on the DC transmission line road between device；
The voltage support unit that dynamic lets out energy device is used to cooperate with the smoothing reactor so as to flow through the electricity of the inverter
Flow through zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820467762.6U CN208571594U (en) | 2018-04-03 | 2018-04-03 | Dynamic is let out can device, equipment and DC transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820467762.6U CN208571594U (en) | 2018-04-03 | 2018-04-03 | Dynamic is let out can device, equipment and DC transmission system |
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| Publication Number | Publication Date |
|---|---|
| CN208571594U true CN208571594U (en) | 2019-03-01 |
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ID=65479781
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767885A (en) * | 2018-04-03 | 2018-11-06 | 国家电网有限公司 | Dynamic is let out can device, equipment and DC transmission system |
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2018
- 2018-04-03 CN CN201820467762.6U patent/CN208571594U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767885A (en) * | 2018-04-03 | 2018-11-06 | 国家电网有限公司 | Dynamic is let out can device, equipment and DC transmission system |
| CN108767885B (en) * | 2018-04-03 | 2024-04-26 | 国家电网有限公司 | Dynamic energy release device, equipment and direct current transmission system |
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