CN102842957A - Intelligent seamless switching device for double direct-current operation power supplies of converting station - Google Patents
Intelligent seamless switching device for double direct-current operation power supplies of converting station Download PDFInfo
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- CN102842957A CN102842957A CN2012103684403A CN201210368440A CN102842957A CN 102842957 A CN102842957 A CN 102842957A CN 2012103684403 A CN2012103684403 A CN 2012103684403A CN 201210368440 A CN201210368440 A CN 201210368440A CN 102842957 A CN102842957 A CN 102842957A
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Abstract
The invention discloses an intelligent seamless switching device for double direct-current operation power supplies of a converting station. A double-pole direct-current bus tie circuit breaker K3 is controlled to switch between a section I direct-current bus and a section II direct-current bus through a PLC (Programmable Logic Controller) under the coordination of a first path of auxiliary seamless switching device and a second path of auxiliary seamless switching device; a failed power supply is prevented from influencing a normal power supply by adopting a diode cutoff direct-current isolating technology as well as an isolating technology and a voltage stabilizing technology for the input and output ends of a high-frequency switching device, so that a failed direct-current input voltage can be isolated automatically and a load on the failed power supply is automatically switched to a normal power supply device in a seamless way (0 second) when any set of direct-current power supply input voltage fails; when failures are cleared, a normal working state can be recovered immediately; and when a storage battery is required to be charged averagely, average charging can be performed, so that the automatic periodic average charging problem of the storage battery is solved, the switching process is shorter in time, and the voltage fluctuation is smaller. Due to the adoption of the intelligent seamless switching device, high-quality intelligent seamless switching is realized for the double direct-current operation power supplies of the converting station, and unattended operation of direct-current power supply equipment of the converting station is realized.
Description
Technical field
The present invention relates to the power technology field, particularly a kind of transforming plant DC operation duplicate supply intelligence seamless switching device.
Background technology
With development of electric power industry, new requirement has been proposed: adopt DC power system duplicate supply scheme in the direct current system (direct current operative power source etc.) of 220kV and above transformer station.The duplicate supply operational mode of the DC power supply device that adopts at present extensively is: when a covering device fault, with it with the load manual switching to another set of device.Though this switching mode has to a certain degree improved the DC power supply device reliability of operation; But can cause in the handoff procedure by the load of switching device shifter (relaying protection, automation equipment and primary cut-out) power failure, directly have influence on the safe and reliable operation of electric power system.Adopting to switch manually also can increase manually-operated working strength, even the accident that may cause because of the manual operation error.
Patent (inventor: comrades such as Zhao Yingchun, Fang Zhaoyuan) at application number CN2011204666780; The direct current duplicate supply intelligence seamless switching device that adopts; Reached direct current duplicate supply intelligence and switched, guarantee when one overlap that DC power supply is under-voltage, can be when overvoltage and dead electricity with the seamless normal power source device that automatically switches to of trouble power institute bringing onto load.Thereby guarantee the continual safely and reliably operation of direct current operative power source.But adopt the auxiliary switching device of bidirectional thyristor in this device; Make it receive the influence of bidirectional thyristor trigger voltage at handoff procedure; The switched voltage ratio is not easy to adjust, and the handoff procedure time is long, and voltage fluctuation is bigger; When riches all the way when give birth to pressing, overvoltage meeting temporary influence is to the DC power supply of normal operation.
Therefore be badly in need of a kind ofly adjusting switched voltage more easily, when switching time is short and one road power supply breaks down, can not having influence on transformer station's duplicate supply intelligence seamless switching device of normal operation power supply.
Summary of the invention
In view of this, technical problem to be solved by this invention provides a kind of when adjusting short and one road power supply of switched voltage, switching time more easily and breaking down, and can not have influence on transformer station's duplicate supply intelligence seamless switching device of normal operation power supply.
The objective of the invention is to propose a kind of transforming plant DC operation duplicate supply intelligence seamless switching device.
The objective of the invention is to realize like this:
Transforming plant DC provided by the invention operation duplicate supply intelligence seamless switching device, auxiliary seamless switching device, the second tunnel auxiliary seamless switching device, diode D1, diode D2, first via bipolar DC contactor K1, the second road bipolar DC contactor K2, bipolar DC bus K3, the first via direct current that comprises I section dc bus, II section dc bus, the first via are imported anodal check diode D3, first via direct current input negative pole check diode D4, the second road direct current and are imported anodal check diode D5 and the second road direct current input negative pole check diode D6;
Said I section dc bus and II section dc bus switch through bipolar DC bus K3;
Be parallel to the two ends of bipolar DC bus K3 after the auxiliary seamless switching device of the said first via and the diode D1 serial connection; Be parallel to the two ends of bipolar DC bus K3 after said the second tunnel auxiliary seamless switching device and the diode D2 serial connection;
Said I section dc bus is connected with first via direct-flow input end through first via bipolar DC contactor K1;
Said II section dc bus is connected with the second road direct-flow input end through the second road bipolar DC contactor K2;
Said first via direct current is imported anodal check diode D3 and is arranged between I section dc bus positive pole and the first via bipolar DC contactor K1; Said first via direct current input negative pole check diode D4 is arranged between I section dc bus negative pole and the first via bipolar DC contactor K1;
Said the second road direct current is imported anodal check diode D5 and is arranged between the II section dc bus positive pole and the second road bipolar DC contactor K1; Said the second road direct current input negative pole check diode D6 is arranged between the II section dc bus negative pole and the second road bipolar DC contactor K1.
Further, the auxiliary seamless switching device of the said first via, the second tunnel auxiliary seamless switching device are high frequency switching device.
Further, also comprise first via DC input voitage detecting unit, the second road DC input voitage detecting unit, I section DC bus-bar voltage detecting unit, II section DC bus-bar voltage detecting unit;
Said first via DC input voitage detecting unit is arranged between the positive-negative power line of first via direct-flow input end;
Said the second road DC input voitage detecting unit is arranged between the positive-negative power line of the second road direct-flow input end;
Said I section DC bus-bar voltage detecting unit is arranged between the positive-negative power line of I section dc bus;
Said II section DC bus-bar voltage detecting unit is arranged between the positive-negative power line of II section dc bus.
Further, also comprise the PLC controller; The signal that said first via DC input voitage detecting unit, the second road DC input voitage detecting unit, I section DC bus-bar voltage detecting unit, II section DC bus-bar voltage detecting unit obtain all is input in the PLC controller.
Further, also comprise monitoring liquid crystal touch screen and power supply; Said power supply is connected with the PLC controller, and said PLC controller is connected with the monitoring liquid crystal touch screen.
Further, said bipolar DC bus K3 is manual switching device shifter.
Further, also comprise sounding light warning device, said sounding light warning device is connected with the PLC controller.
Further, the said first via bipolar DC contactor K1 and the second road bipolar DC contactor K2 adopt the Intelligent Composite D.C. contactor.
The invention has the advantages that: when the present invention adopts the DC input voitage overvoltage; The dc-isolation technology of utilizing diode to end when in time cutting off this direct current of passing by pressure input, under-voltage, decompression is isolated decompression or under-voltage direct current input automatically (disconnections) and is assisted the input of seamless switching device (HF switch), the isolation and the voltage stabilizing technique of output; Guarantee that trouble power can not influence normal power source, realize seamless fast (0 second) switching.Adopt novel auxiliary switching device to replace former auxiliary switching device with bidirectional thyristor; Make handoff procedure not receive the influence of bidirectional thyristor trigger voltage; Switched voltage is adjusted than the voltage of former auxiliary switching device more easily, and the handoff procedure time is shorter, and voltage fluctuation is littler.When wherein one road DC input voitage generation overvoltage, decompression with when under-voltage; Can not have influence on the power supply of normal operation; And fast shut-off fault (overvoltage), automatic instantaneous isolation decompression or under-voltage input power supply also switch seamlessly to the normal voltage power supply with institute's bringing onto load.Reached the high-quality intelligence of transforming plant DC operation duplicate supply and switched, can guarantee when one overlapping that DC power supply is under-voltage, when overvoltage and dead electricity, can trouble power institute bringing onto load seamless (0 second) being automatically switched to the normal power source device.Thereby guarantee the continual safely and reliably operation of direct current operative power source, the potential security risk of electrical network and DC equipment safe operation is reduced to minimum degree, can really realize the unattended operation of transforming plant DC power-supply device.
Description of drawings
In order to make the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that the present invention is made further detailed description below, wherein:
Fig. 1 is transforming plant DC operation duplicate supply intelligence seamless switching schematic diagram;
The novel transforming plant DC operation duplicate supply intelligence seamless switching device systematic schematic diagram that Fig. 2 provides for the embodiment of the invention;
Fig. 3 is PLC and voltage transmitter elementary diagram;
Fig. 4 is the control principle of PLC output contact and auxiliary relay;
Fig. 5 is female control principle that joins air circuit;
Fig. 6 is the control principle that 1,2 tunnel input D.C. contactor overvoltages, overvoltage recover;
Fig. 7 is 1 road direct current input decompression (breaking off 1 road direct current input sky an opens) I section busbar voltage oscillogram;
Fig. 8 is that 1 road direct current is imported under-voltage I section busbar voltage oscillogram;
Fig. 9 is 1 road direct current input overvoltage I section busbar voltage oscillogram;
Figure 10 is 1 road direct current input overvoltage II section busbar voltage oscillogram.
Embodiment
Below will combine accompanying drawing, the preferred embodiments of the present invention will be carried out detailed description; Should be appreciated that preferred embodiment has been merely explanation the present invention, rather than in order to limit protection scope of the present invention.
Fig. 1 is transforming plant DC operation duplicate supply intelligence seamless switching schematic diagram; The novel transforming plant DC operation duplicate supply intelligence seamless switching device systematic schematic diagram that Fig. 2 provides for the embodiment of the invention; Fig. 3 is PLC and voltage transmitter elementary diagram; Fig. 4 is the control principle of PLC output contact and auxiliary relay; Fig. 5 is female control principle that joins air circuit; Fig. 6 is the control principle that 1,2 tunnel input D.C. contactor overvoltages, overvoltage recover; Fig. 7 is 1 road direct current input decompression (breaking off 1 road direct current input sky an opens) I section busbar voltage oscillogram; Fig. 8 is that 1 road direct current is imported under-voltage I section busbar voltage oscillogram; As shown in the figure: transforming plant DC provided by the invention operation duplicate supply intelligence seamless switching device, auxiliary seamless switching device, the second tunnel auxiliary seamless switching device, diode D1, diode D2, first via bipolar DC contactor K1, the second road bipolar DC contactor K2, bipolar DC bus K3, the first via direct current that comprises I section dc bus, II section dc bus, the first via are imported anodal check diode D3, first via direct current input negative pole check diode D4, the second road direct current and are imported anodal check diode D5 and the second road direct current input negative pole check diode D6;
Said I section dc bus and II section dc bus switch through bipolar DC bus K3;
Be parallel to the two ends of bipolar DC bus K3 after the auxiliary seamless switching device of the said first via and the diode D1 serial connection; Be parallel to the two ends of bipolar DC bus K3 after said the second tunnel auxiliary seamless switching device and the diode D2 serial connection; The auxiliary seamless switching device of the said first via, the second tunnel auxiliary seamless switching device are high frequency switching device.Auxiliary seamless switching device is the high frequency switching device with input, output electrical isolation, output voltage stabilizing function; As long as adjust the output voltage values of output; The input voltage of input fluctuates in certain scope; Output voltage constant (voltage stabilizing function), input and output are isolated on electric during operation, and promptly input and output are independent of each other.
Auxiliary seamless switching device one side of the first via is anodal with II section dc bus respectively, negative pole is connected; And between the auxiliary seamless switching device of the first via is connected with II section dc bus is anodal, diode D1 is set; The negative pole of this diode D1 is connected with II section dc bus is anodal; The positive pole of this diode D1 is connected with the auxiliary seamless switching device of the first via, and the opposite side of the auxiliary seamless switching device of the first via is anodal with I section dc bus respectively, negative pole is connected.
The second tunnel auxiliary seamless switching device one side is anodal with I section dc bus respectively, negative pole is connected; And the auxiliary seamless switching device the second tunnel is provided with diode D2 between being connected with I section dc bus is anodal; The negative pole of this diode D2 is connected with I section dc bus is anodal; The positive pole of this diode D2 is connected with the auxiliary seamless switching device of the first via, and the opposite side of the second tunnel auxiliary seamless switching device is anodal with II section dc bus respectively, negative pole is connected.
Said I section dc bus is connected with first via direct-flow input end through first via bipolar DC contactor K1;
Said II section dc bus is connected with the second road direct-flow input end through the second road bipolar DC contactor K2;
Said first via direct current is imported anodal check diode D3 and is arranged between I section dc bus positive pole and the first via bipolar DC contactor K1; Said first via direct current input negative pole check diode D4 is arranged between I section dc bus negative pole and the first via bipolar DC contactor K1; Therefore, I section dc bus can pass through the first via direct current that is connected with first via bipolar DC contactor K1 and imports anodal check diode D3, first via direct current input negative pole check diode D4 and be connected with first via direct-flow input end; Two diode D3 of the first direct current input circuit, the effect of D4 are to isolate the input power supply automatically in first via input power supply generation decompression with when under-voltage.
Said the second road direct current is imported anodal check diode D5 and is arranged between the II section dc bus positive pole and the second road bipolar DC contactor K1; Said the second road direct current input negative pole check diode D6 is arranged between the II section dc bus negative pole and the second road bipolar DC contactor K1.
Therefore, II section dc bus can pass through the second road direct current that is connected with the second road bipolar DC contactor K2 and imports anodal check diode D5, the second road direct current input negative pole check diode D6 and be connected with the second road direct-flow input end; Two diode D5 of the second direct current input circuit, the effect of D6 are to isolate the input power supply automatically in the second tunnel input power supply generation decompression with when under-voltage.
Also comprise first via DC input voitage detecting unit, the second road DC input voitage detecting unit, I section DC bus-bar voltage detecting unit, II section DC bus-bar voltage detecting unit;
Said first via DC input voitage detecting unit is arranged between the positive-negative power line of first via direct-flow input end;
Said the second road DC input voitage detecting unit is arranged between the positive-negative power line of the second road direct-flow input end;
Said I section DC bus-bar voltage detecting unit is arranged between the positive-negative power line of I section dc bus;
Said II section DC bus-bar voltage detecting unit is arranged between the positive-negative power line of II section dc bus.
Also comprise the PLC controller; The signal that said first via DC input voitage detecting unit, the second road DC input voitage detecting unit, I section DC bus-bar voltage detecting unit, II section DC bus-bar voltage detecting unit obtain all is input in the PLC controller.
Also be provided with I section DC bus-bar voltage transmitter between the said I section dc bus both positive and negative polarity, said I section DC bus-bar voltage transmitter is input to signal among the PLC;
Also be provided with II section DC bus-bar voltage transmitter between the said II section dc bus both positive and negative polarity, said II section DC bus-bar voltage transmitter is input to signal among the PLC.
Also comprise monitoring liquid crystal touch screen and power supply; Said power supply is connected with the PLC controller, and said PLC controller is connected with monitoring liquid crystal touch screen.
Said bipolar DC bus K3 is manual switching device shifter.
Also comprise sounding light warning device, said sounding light warning device is connected with the PLC controller.
The said first via bipolar DC contactor K1 and the second road bipolar DC contactor K2 adopt electronics arc extinguishing, high energy-conservation, no arc, the overlength Intelligent Composite D.C. contactor in useful life.
The novel transforming plant DC operation duplicate supply intelligence seamless switching schematic diagram that Fig. 2 provides for the embodiment of the invention, Fig. 3 is PLC and voltage transmitter elementary diagram; Fig. 4 is the control principle of PLC output contact and auxiliary relay; As shown in the figure, dc output end comprises I section direct current output on off state and I section direct current output alarm, II section direct current output on off state and II section direct current output alarm; The PLC controller is connected with relay K J1, KJ2, KJ3, KJ4, KJ5, KJ6, KJ7 respectively, and wherein, relay K J1 is 1 and 2 road direct currents input mistake, under-voltage; KJ2 is that the input of 1 and 2 road direct currents is lost, under-voltage recovery; KJ3 is 1 road direct current input overvoltage, and KJ4 is 2 road direct currents input overvoltage, and KJ5 is that 1 road direct current input overvoltage recovers; KJ6 is that 2 road direct currents input overvoltage recovers; KJ7 is system's total failare output, 1 tunnel circuit corresponding to I section dc bus side among present embodiment and the following embodiment, 2 tunnel circuit corresponding to II section dc bus side.
Fig. 5 is female control principle that joins air circuit; Adopt 1 the tunnel lose, the contact KJ3 of the under-voltage auxiliary relay interlocking of connecting with the contact KJ5 of the auxiliary relay of mistake, under-voltage recovery controls coil electricity or the outage of No. 1 D.C. contactor K1; In like manner; Adopt 2 the tunnel lose, the contact KJ4 of the under-voltage auxiliary relay interlocking of connecting with the contact KJ6 of the auxiliary relay of mistake, under-voltage recovery controls coil electricity or the outage of No. 2 D.C. contactor K2, increased reliability.
Fig. 6 is the control principle that 1,2 tunnel input D.C. contactor overvoltages, overvoltage recover; K3 is can electronic and manually operated dc circuit breaker, and when automatic transmission, K3 was closed when S1 and S2 connected; K3 broke off when S1 and S4 connected.When PLC detected 1 road or 2 road direct currents inputs decompression, under-voltage, overvoltage fault take place, the control contact control K3 closure through auxiliary relay made I, the parallel connection of II section bus.Eliminate the control contact control K3 that recovers just often through auxiliary relay and break off when PLC detects 1 road or 2 road direct currents inputs decompression, under-voltage, overvoltage fault, circuit recovers normal operating state.The interlocking of connect with decompression separately, auxiliary relay contact under-voltage, that overvoltage recovers respectively of the contact of 1 tunnel, 2 tunnel decompressions, under-voltage, overvoltage auxiliary relay has increased or by property.
As shown in the figure: the dc operation duplicate supply seamless switching device that the embodiment of the invention provides, its seamless switching principle is following:
When the operating state of normal operation circuit; I section DC bus-bar voltage and II section DC bus-bar voltage are 234V (storage battery of 104/2V); Because of the direct current input circuit is connected to 2 check diodes, the pressure drop of 1.4V is arranged during forward conduction so DC input voitage should transfer to 235V.The input voltage of the first auxiliary seamless switching device and the second auxiliary seamless switching device is: 234V, output voltage are 226V.Obviously, the first auxiliary seamless switching device and the second auxiliary seamless switching device string end at the diode D1 and the D2 of output head anode.By 2 road direct currents input power supply, two overlap direct current operative power sources normally operation separately to I section DC bus-bar voltage by 1 road direct current input power supply, II section DC bus-bar voltage.At this moment, the input of the first auxiliary seamless switching device and the second auxiliary seamless switching device is connected on each self-corresponding dc bus, makes Hot Spare.
When 1 road direct current is imported out the under-voltage or decompression of generation and is brought down below 226V; Obviously: string is in the diode D2 conducting of the output head anode of auxiliary seamless switching device 2; I section busbar voltage is by seamless switching device 2 power supplies (voltage is 226V), and assurance I section busbar voltage is not interrupted.Meanwhile: I section busbar voltage transmitter is sent to PLC with the signal of under-voltage or decompression; When under-voltage or decompression signal reach setting value (180V～230 are adjustable), PLC sends the closed instruction of K3 and I section bus loss of pressure or under-voltage sound, visual alarm, switching screen and goes up that malfunction indicator lamp is bright, monitoring touches demonstration K3 closure on the mould screen main wiring diagram.In 40ms, K3 is closed, I section bus and the parallel connection of II section bus, and the load seamless branches on the I section bus is to II section bus.The voltage of I section bus is higher than seamless switching device 2 output end voltages after the K3 closure, and obviously string ends at the diode D2 of auxiliary seamless switching device 2 output head anodes, and auxiliary seamless switching device 2 outputs are output voltage not.Meanwhile: when I section bus generation decompression or when under-voltage; Behind auxiliary seamless switching device 2 supply I section buses; After the K3 closure makes I section bus and the parallel connection of II section bus; String ends at diode D3, the D4 of 1 road direct-current input power supplying positive and negative electrode at once, and automatic disconnection is under-voltage or the input of No. 1 DC power supply of decompression.
When being connected on the voltage transmitter of 1 road direct current input; And detect 1 road DC input voitage and recover normal (magnitude of voltage is adjustable); PLC sends the K3 open command; And remove I section bus loss of pressure or under-voltage sound, visual alarm, monitoring and touch on the mould screen main wiring diagram and show that K3 breaks off, normally run indicator is bright.After K3 broke off, system restoration normally moved.
When decompression took place for 1 road direct current input, I section DC bus-bar voltage oscillogram was visible (Fig. 7): after start was stable, regulating 1 tunnel, 2 road power input voltages, to make I section, II section busbar voltage be 234V, and every road institute bringing onto load electric current is 30A, the device operate as normal.1 road line under-voltage value set point 220V.Open when breaking off 1 tunnel input power supply sky, causing 1 road input voltage is 0V (decompression), visible from 1 section busbar voltage switching waveform figure: I section busbar voltage handoff procedure, magnitude of voltage minimum 224V, peak 235V.Switching time, 0.768s promptly passed through 0.768s, and I section busbar voltage is gone up to 234V by 224V, and waveform is continuous fully, the phenomenon of no-voltage interruption therebetween.Meet intelligent seamless switching requirement fully.
Take place when under-voltage from 1 road direct current input, I section DC bus-bar voltage oscillogram is visible (Fig. 8): after start is stable, regulates 1 tunnel, 2 road power input voltages and make I section, II section busbar voltage 234V, every road bringing onto load electric current is 30A, the device operate as normal.1 road line under-voltage value set point is 220V.When adjusting 1 road power input voltage was lower than 220V, device automaticallyed switch.Visible from busbar voltage switching waveform figure: I section bus handoff procedure, magnitude of voltage minimum 224V, peak 235 V, switching time 1.18s; Promptly pass through 1.18s, I section bus load voltage is gone up to 234V by 224V, and waveform is continuous fully, the phenomenon of no-voltage interruption therebetween.Meet intelligent seamless switching requirement fully.
When 1 tunnel input power supply generation overvoltage; When the voltage transmitter that is connected on 1 road direct current input detects 1 road direct current input overvoltage and reaches setting value (magnitude of voltage is adjustable); PLC sends the K1 open command; And send sound, the visual alarm of 1 road direct current input overvoltage and on monitoring touch-screen main wiring diagram, show that K1 breaks off, (during 1 tunnel input power supply generation overvoltage, string ends at the diode D2 of seamless switching device 2 output head anodes; Auxiliary seamless switching device 1 output have voltage stabilizing function output and still be 226V, and string ends at the diode D1 of auxiliary seamless switching device 1 output head anode.Obviously; Overvoltage can not be delivered on the bus of 2 sections direct currents of II).At this moment, circuit is in under-voltage condition, handoff procedure subsequently and decompression, under-voltage process is identical.
When overvoltage took place for 1 road direct current input, I section DC bus-bar voltage oscillogram (Fig. 9) was visible: after start is stable, regulates 1 tunnel, 2 road power input voltages and make I section, II section busbar voltage 234V, every road institute bringing onto load electric current is 30A, the device operate as normal.1 road power supply overpressure value set point 242V.When 1 road input voltage increased to 242V, device automaticallyed switch.Visible from I section busbar voltage switching waveform figure: I section bus switched voltage handoff procedure, voltage minimum 224V, peak 242 V, switching time 018s; Promptly pass through 0.18s, I section bus load voltage returns to 234V by 242V, and waveform is continuous fully, the phenomenon of no-voltage interruption therebetween.Meet intelligence fully and switch requirement.
From when 1 road direct-current input power supplying generation overvoltage; The bus oscillogram (Fig. 9) of II section direct current is visible in seamless intelligent handoff procedure: after start is stable; Regulate 1 tunnel, 2 road power input voltages and make I section, II section busbar voltage 234V, every road institute bringing onto load electric current is 30A, the device operate as normal.1 road power supply overpressure value set point 242V.When 1 road input voltage increased to 242V, device automaticallyed switch.Visible from II section busbar voltage switching waveform figure: when 2 road input voltage generation overvoltages, II section busbar voltage does not receive the influence of 2 tunnel input power supply overvoltages fully.Meet intelligence fully and switch requirement.
When 1 road direct-current input power supplying overvoltage is eliminated recovery just often; The voltage transmitter that is connected on the input of 1 road direct current detects 1 road direct-current input power supplying overvoltage and eliminates when recovering normally to reach setting value (adjustable); PLC sends the K1 close command, and removes sound, the visual alarm of 1 road direct current input overvoltage and on monitoring touch mould screen main wiring diagram, show that K1 is closed.At this moment, normal run indicator is bright.
In addition, that 2 road direct-current input power supplyings take place is under-voltage, the switching principle of decompression, overvoltage is under-voltage with the generation of 1 tunnel road direct-current input power supplying, the switching principle of decompression, overvoltage is identical, no longer repeat specification.
Embodiment 3
Fig. 2 is a dc operation duplicate supply intelligence seamless switching device; Its system principle is like figure: dc operation duplicate supply intelligence seamless switching device is by check diode D3, the D4 of 1,2 road DC input voitage detecting units, I, II section DC bus-bar voltage detecting unit, PLC and controller, 1,2 tunnel auxiliary seamless switching device, bipolar DC bus K3 (having the electric/manual function) bipolar DC contactor K1, K2 (electronic divide-shut brake) and first via direct current input positive and negative electrode, check diode D5, the D6 of the second road direct current input positive and negative electrode and monitor composition such as lcd touch mould screen.
Feeding out the loop during to the double-bus manual switchover in the dc operation duplicate supply typical wiring can short supply interruption, causes the intermittent dead electricity of equipment, can't non-stop run etc. problem.This device has used apparatus for fast switching (auxiliary seamless switching device) to come it is carried out the control of reliable and stable, thus the switching fast and accurately when having realized the various fault of bus.Guaranteed that bus feeds out power supply incessantly.
This device has following function: when under-voltage and dead electricity fault take place in arbitrary cover DC power supply input voltage, and isolated fault DC input voitage and trouble power institute bringing onto load seamless (0 second) automatically switched to the normal power source device automatically.Eliminate recovery just often when the direct-current input power supplying voltage and the dead electricity of fault, bringing onto load seamless (0 second) returns to normal operating conditions automatically.When arbitrary cover DC power supply input voltage generation overvoltage fault, but automatic disconnection fault input voltage and trouble power institute bringing onto load seamless (0 second) automatically switched to the normal power source device can not have influence on the DC power supply of normal operation.Eliminate recovery just often when the direct-current input power supplying overvoltage of fault, bringing onto load seamless (0 second) returns to normal operating conditions automatically.(purpose that storage battery all fills is the unbalanced phenomenon of eliminating between the single storage battery of voltage when arbitrary group storage battery all fills; Because of 104 storage battery even charging voltages are 245V; Can cause overtension to relaying protection, automatics height, all adopt the load manual transfer of the DC power supply that manually need all fill behind another DC power supply, all to fill again now in the duplicate supply.Whenever all fill once at a distance from 1 to 3 months reply storage battery automatic or manuals by the rules regulation), can directly all fill with this device this group storage battery.This group storage battery institute bringing onto load can seamless (0 second) automatically switch on the supply unit of normal operation, has solved the difficult problem that DC power system all fills automatically.Manual handoff functionality, the panel that switches screen is provided with the switch that an automatic/hand switches.Switch is placed when automatic, and the power connection of PLC switches by PLC and carries out dc operation duplicate supply intelligence seamless switching automatically.When need are manual, switching, when the switch that automatic/hand is switched placed manual position, the power supply of PLC broke off, and automatic switchover is withdrawed from.At this moment, the bus of DC section I and II section bus can only carry out manual switchover.
Fig. 3 is PLC and voltage transmitter elementary diagram; When mother joined air circuit K3 and places automatic transmission, when S2 and S1 connected, the K3 main contact was closed, when S4 connects with S1, the disconnection of K3 main contact.Be the reliability that guarantees to switch, adopt the auxiliary relay control contact and 1 tunnel of or decompression under-voltage, the auxiliary relay control contact interlocking that 2 road direct currents are under-voltage or decompression is recovered when 1 tunnel, 2 road direct currents.The auxiliary relay control contact of 1 road direct current overvoltage and the auxiliary relay control contact interlocking that 1 road direct current overvoltage recovers.The auxiliary relay control contact of 2 road direct current overvoltages and the auxiliary relay control contact interlocking that 2 road direct current overvoltages recover.DC bipolar contactor K1, K2 main contact are normally closed (moving disconnected), disconnection during overvoltage, closed when overvoltage recovers.
When overvoltage takes place in the input of 1 road direct current; The normally opened contact closure of auxiliary relay KJ3 makes DC bipolar contactor K1 coil charged, and the K1 main contact breaks off excision overvoltage input; Another normally opened contact of KJ3 is closed simultaneously, makes female air circuit K3 main contact closure that joins.When overvoltage recovered, the normally-closed contact of auxiliary relay KJ5 broke off, and makes the K1 coil losing electricity, and the K1 main contact is closed, and simultaneously, the normally opened contact of KJ5 is closed, and bus K3 is broken off, and circuit recovers normal operating conditions.Principle when 2 road direct currents input generation overvoltage recovers with overvoltage no longer repeats to state to tell at this with last identical.
This device can be simplified handover operation greatly, avoids the accident that causes because of manual operation error, and the unattended operation of DC power supply device is played guaranteeing role.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (8)
1. transforming plant DC operation duplicate supply intelligence seamless switching device is characterized in that: auxiliary seamless switching device, the second tunnel auxiliary seamless switching device, diode D1, diode D2, first via bipolar DC contactor K1, the second road bipolar DC contactor K2, bipolar DC bus K3, the first via direct current that comprises I section dc bus, II section dc bus, the first via imported anodal check diode D3, first via direct current input negative pole check diode D4, the second road direct current and imported anodal check diode D5 and the second road direct current input negative pole check diode D6;
Said I section dc bus and II section dc bus switch through bipolar DC bus K3;
Be parallel to the two ends of bipolar DC bus K3 after the auxiliary seamless switching device of the said first via and the diode D1 serial connection; Be parallel to the two ends of bipolar DC bus K3 after said the second tunnel auxiliary seamless switching device and the diode D2 serial connection;
Said I section dc bus is connected with first via direct-flow input end through first via bipolar DC contactor K1;
Said II section dc bus is connected with the second road direct-flow input end through the second road bipolar DC contactor K2;
Said first via direct current is imported anodal check diode D3 and is arranged between I section dc bus positive pole and the first via bipolar DC contactor K1; Said first via direct current input negative pole check diode D4 is arranged between I section dc bus negative pole and the first via bipolar DC contactor K1;
Said the second road direct current is imported anodal check diode D5 and is arranged between the II section dc bus positive pole and the second road bipolar DC contactor K1; Said the second road direct current input negative pole check diode D6 is arranged between the II section dc bus negative pole and the second road bipolar DC contactor K1.
2. transforming plant DC operation duplicate supply intelligence seamless switching device according to claim 1, it is characterized in that: the auxiliary seamless switching device of the said first via, the second tunnel auxiliary seamless switching device are high frequency switching device.
3. transforming plant DC operation duplicate supply intelligence seamless switching device according to claim 2 is characterized in that: also comprise first via DC input voitage detecting unit, the second road DC input voitage detecting unit, I section DC bus-bar voltage detecting unit, II section DC bus-bar voltage detecting unit;
Said first via DC input voitage detecting unit is arranged between the positive-negative power line of first via direct-flow input end;
Said the second road DC input voitage detecting unit is arranged between the positive-negative power line of the second road direct-flow input end;
Said I section DC bus-bar voltage detecting unit is arranged between the positive-negative power line of I section dc bus;
Said II section DC bus-bar voltage detecting unit is arranged between the positive-negative power line of II section dc bus.
4. transforming plant DC operation duplicate supply intelligence seamless switching device according to claim 3 is characterized in that: also comprise the PLC controller; The signal that said first via DC input voitage detecting unit, the second road DC input voitage detecting unit, I section DC bus-bar voltage detecting unit, II section DC bus-bar voltage detecting unit obtain all is input in the PLC controller.
5. transforming plant DC operation duplicate supply intelligence seamless switching device according to claim 4 is characterized in that: also comprise monitoring liquid crystal touch screen and power supply; Said power supply is connected with the PLC controller, and said PLC controller is connected with monitoring liquid crystal touch screen.
6. transforming plant DC operation duplicate supply intelligence seamless switching device according to claim 1, it is characterized in that: said bipolar DC bus K3 is manual switching device shifter.
7. according to each described transforming plant DC operation duplicate supply intelligence seamless switching device of claim 1-6, it is characterized in that: also comprise sounding light warning device, said sounding light warning device is connected with the PLC controller.
8. transforming plant DC operation duplicate supply intelligence seamless switching device according to claim 7 is characterized in that: the said first via bipolar DC contactor K1 and the second road bipolar DC contactor K2, adopt the Intelligent Composite D.C. contactor.
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| CN2012103684403A CN102842957A (en) | 2012-09-28 | 2012-09-28 | Intelligent seamless switching device for double direct-current operation power supplies of converting station |
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| CN103414240A (en) * | 2013-07-15 | 2013-11-27 | 国家电网公司 | Direct current power supply automatic control device |
| CN104237586A (en) * | 2014-08-19 | 2014-12-24 | 千江（上海）信息科技有限公司 | High-precision metering system of double-bus power supply circuit |
| CN104333111A (en) * | 2013-07-22 | 2015-02-04 | 光宝电子(广州)有限公司 | DC uninterruptible power system and device thereof |
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| CN105811563A (en) * | 2016-03-22 | 2016-07-27 | 国网福建省电力有限公司 | AC charging automatic switching circuit for DC system |
| CN106532919A (en) * | 2016-12-19 | 2017-03-22 | 广东电网有限责任公司东莞供电局 | System architecture for mutual hot backup of two segments of DC power buses |
| CN108199337A (en) * | 2017-12-13 | 2018-06-22 | 华中科技大学 | Transformer station secondary system and its performance improvement method are pressed in one kind |
| CN108199337B (en) * | 2017-12-13 | 2019-04-05 | 华中科技大学 | Transformer station secondary system and its performance improvement method are pressed in one kind |
| CN110165655A (en) * | 2019-06-04 | 2019-08-23 | 上海电器科学研究所（集团）有限公司 | A kind of DC power supply and machine-cut changing device |
| CN110165655B (en) * | 2019-06-04 | 2024-01-30 | 上海电器科学研究所（集团）有限公司 | Direct-current power supply parallel operation switching device |
| CN112072771A (en) * | 2019-06-10 | 2020-12-11 | 维谛技术有限公司 | Uninterrupted power supply method, device, equipment and medium |
| CN112186757A (en) * | 2020-09-27 | 2021-01-05 | 中国华电科工集团有限公司 | Control method and control device for regional power distribution network and regional power distribution network |
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| CN113555937B (en) * | 2021-07-27 | 2022-05-20 | 石家庄通合电子科技股份有限公司 | Automatic switching method for three-charging and two-charging |
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| CN113466632B (en) * | 2021-07-30 | 2023-12-19 | 西安热工研究院有限公司 | Uninterrupted DC grounding searching system and uninterrupted DC grounding searching method |
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Application publication date: 20121226 |