CN103138384B - Configuration system and method for backup automatic switch in alternating current and soft direct current hybrid power supply area - Google Patents
Configuration system and method for backup automatic switch in alternating current and soft direct current hybrid power supply area Download PDFInfo
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- CN103138384B CN103138384B CN201310094019.2A CN201310094019A CN103138384B CN 103138384 B CN103138384 B CN 103138384B CN 201310094019 A CN201310094019 A CN 201310094019A CN 103138384 B CN103138384 B CN 103138384B
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Abstract
The invention provides a configuration system and a method for a backup automatic switch in an alternating current and soft direct current hybrid power supply area. The system comprises a 10-kilovolt alternating current bus bridge which comprises a negative direct current bus bridge and a positive direct current bus bridge, an interconnection reactor which is connected with the 10-kilovolt alternating current bus bridge and an interconnection arm which is connected with the interconnection reactor. One end of an interconnection direct current capacitor CP1 is connected with a turn-off device VTP1, one end of an interconnection direct current capacitor CP2 is connected with a turn-off device VTP2, and an interconnection direct current capacitor CP3 is connected with the other end of the interconnection direct current capacitor CP2 and is connected with the ground. An interconnection direct current switch QFP1 and an interconnection direct current switch QFP2 are respectively connected with the positive direct current bus bridge and the negative direct current bus bridge and can play a role of isolation when stoppage occurs. According to the configuration system and the method for the backup automatic switch in the alternating current and soft direct current hybrid power supply area, an alternating current transmission and distribution power grid area and a soft direct current power distribution network are prevented from becoming islands in the alternating current transmission and distribution power grid and the soft direct current transmission and distribution power grid hybrid power supply period, and a problem of interconnecting two power grid areas is solved.
Description
Technical field
The present invention relates to exchange and flexible direct current transmission and distribution network prepared auto restart configuring technical field, relate in particular to a kind of prepared auto restart configuration-system and method of alternating current-direct current hybrid power supply regional distribution network.
Background technology
At present, the most of town and country of China distribution network system adopts 10 kV alternating currents as main supply power voltage.Due to economic in recent years fast development, the problems such as power supply capacity deficiency, website and circuit corridor resource be very nervous in the larger downtown area of load density, have been exposed, and occur that in the area, remote countryside of underload voltage-drop is excessive, user's quality of voltage is difficult to be protected, the situations such as power supply distance is limited, therefore, power distribution network is taked to the power supply of flexible direct current transmission and distribution network.
Development along with power electronic device and control technology, there is novel semiconductor device-igbt (Insulated Gate Bipolar Transistor, IGBT) in the application of low-voltage system, make IGBT as voltage source converter (the Voltage-Sourced Converter of switching device, VSC), on industrial drives device, be used widely subsequently, again after the voltage of IGBT device subsequently and capacity are repeatedly upgraded, make the voltage source converter that adopts igbt to form apply and become a reality in direct current transmission and distribution net.
In the application of direct current transmission and distribution net, converter adopts IGBT valve and two level (or many level) three-phase mechanism, and use pulse modulation technology (Pulse Width Modulation, PWM) control the situation of cut-offfing of IGBT valve, after possessing above-mentioned functions, make the DC distribution net system being formed by it be different from many aspects conventional direct current transmission and distribution, can overcome the multiclass problem presenting in conventional direct current transmission and distribution.This novel direct current transmission and distribution technology, referred to as " flexible direct current (High Voltage Direct Current Flexible, HVDC-Flexible) ".
Flexible direct current (HVDC-Flexible) is from conventional direct current transmission and distribution technical development, advantage is the advantage of its conventional direct current transmission and distribution, for example: flexible direct current electric line will lack a wire than current interchange transmission and distribution network circuit in service, make its line cost low, loss is little, has saved a large amount of corridors of electric line; Flexible direct current distribution network system, in order to realize less failure rate, generally adopts cable as distribution network system passage, and the transmission capacity of cable is large, loss is little, life cycle is long, fed distance is unrestricted; Flexible direct current distribution network system adopts cable as power transmission and distribution passage, and generally, at underground use directly buried technology, engineering cost is low, the duration is short, also reduces the impact on environment; In addition, flexible direct current distribution network system is stable strong; Flexible direct current distribution network system can be realized the interconnected of asynchronous system; Flexible direct current can be powered to passive region, does not have commutation failure problem; The active power that flexible direct current distribution network system is carried and reactive power can independently be controlled fast; Flexible direct current distribution network system is built by separate periods, favorable expandability preferably; Fast recovery of power supply and black startup after accident; Can be to passive mains supply etc.
But current interchange transmission and distribution network technology is born main status, and flexible direct current distribution network system is to be transformed in interchange transmission and distribution network technical foundation mostly, in transition process, will be a long-term system engineering, according to modification Experience both domestic and external, whole engineering process may last up to about several years.During this period, in exchanging transformation region, transmission and distribution network region, not all power supply area all possesses condition and the opportunity of boosting at once, certainly exist the region that the power distribution network of two kinds of heterogeneity grades coexists, also exchange transmission and distribution network region and hybrid power supply region, flexible direct current power distribution network region.Specifically as shown in Figure 1.
During adopting interchange transmission and distribution network region and the region hybrid power supply of flexible direct current power distribution network, ac transmission distribution district and flexible direct current power distribution network region become isolated island, solve two kinds of Grid interconnect problem.
Summary of the invention
The prepared auto restart configuration-system in a kind of interchange provided by the invention and flexible direct current hybrid power supply region, comprising:
10kV ac bus bridge, it is connected with the 10kV 1M bus of described interchange transmission and distribution network, for converging 10KV AC energy;
Negative DC bus bridge, it is connected with the negative DC bus of described flexible direct current transmission and distribution network;
Positive direct-current bus bridge, it is connected with the positive direct-current bus of described flexible direct current transmission and distribution network;
Described negative DC bus bridge and positive direct-current bus bridge are for converging the direct current energy of described flexible direct current transmission and distribution network;
Contact reactor, it is connected with described 10kV ac bus bridge, its voltage source converter that is described flexible direct current transmission and distribution network with exchange transmission and distribution network and carry out quality of power supply exchange;
Contact converter valve brachium pontis, it is connected with described contact reactor, takes three-phase two level bridge architectures, comprises turn-off device VTP1, turn-off device VTP2, fly-wheel diode VDP1 and VDP2;
Contact DC capacitor CP1 one end is connected with described turn-off device VTP1, and contact DC capacitor CP2 one end is connected with described turn-off device VTP2, and contact DC capacitor CP1 is connected and ground connection with the other end of contact DC capacitor CP2; This contact DC capacitor CP1 and contact DC capacitor CP2 are used to voltage source converter to provide direct voltage to support, and cushion turn-off device VTP1 and the impulse current of turn-off device VTP2 when turn-offing of described contact converter valve brachium pontis, reduce DC side harmonics;
Contact DC switch QFP1 and contact DC switch QFP2 connect with described positive direct-current bus bridge and negative DC bus bridging respectively, play buffer action when fault.
A kind of method that the present invention also provides interchange and flexible direct current hybrid power supply region spare power automatic switching method, the method to be specially to act on the backup auto-activating device in aforementioned interchange and flexible direct current hybrid power supply region to charge, comprises;
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into position;
Whether detect the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network and described positive direct-current bus in a minute position, and be not inspecting state;
Detect on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus and whether all have voltage;
Whether detect the transformer B1 main transformer low-side switch DL2 of interchange transmission and distribution network in co-bit;
When the prepared auto restart function pressing plate that described backup auto-activating device detected is in placement position, the DC contact switch QFP2 connecting on the DC contact switch QFP1 connecting on the negative DC bus of described flexible direct current transmission and distribution network and described positive direct-current bus is all in a minute position, and be not maintenance, on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus, all there is voltage, the transformer B1 main transformer low-side switch DL2 of described interchange transmission and distribution network is when co-bit, after t1 time delays, give described backup auto-activating device charging.
A kind of method that the present invention also provides interchange and flexible direct current hybrid power supply region spare power automatic switching method, the method to be specially to act on the backup auto-activating device in aforementioned interchange and flexible direct current hybrid power supply region to charge, comprises;
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into position;
Whether detect the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network and described positive direct-current bus in a minute position, and be not inspecting state;
Detect on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus and whether all have voltage;
Whether the transformer B2 main transformer low-pressure side DC switch QF1 of detection flexible direct current transmission and distribution network and DC switch QF2 be in co-bit;
When the prepared auto restart function pressing plate that described backup auto-activating device detected is in placement position, the DC contact switch QFP2 connecting on the DC contact switch QFP1 connecting on the negative DC bus of described flexible direct current transmission and distribution network and described positive direct-current bus is all in a minute position, and be not maintenance, on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus, all there is voltage, the transformer B2 main transformer low-pressure side DC switch QF1 of described flexible direct current transmission and distribution network and DC switch QF2 are in co-bit, after t1 time delays, give described backup auto-activating device charging.
A kind of method that the present invention also provides interchange and flexible direct current hybrid power supply region spare power automatic switching method, the method to be specially to act on the backup auto-activating device in aforementioned interchange and flexible direct current hybrid power supply region to discharge, comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device is exiting position;
Whether detect the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network or described positive direct-current bus in co-bit, or be inspecting state;
Whether detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network, described flexible direct current transmission and distribution network, negative DC bus no-voltage;
Detect the hand jumping signal of whether receiving the transformer B1 main transformer high side switch DL1 that exchanges transmission and distribution network;
Detect the hand jumping signal of whether receiving the transformer B1 main transformer low-side switch DL2 that exchanges transmission and distribution network;
Detect the main transformer backup protection signal of whether receiving transformer B1;
When the prepared auto restart function pressing plate of described backup auto-activating device being detected, exiting position, or the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network or described positive direct-current bus detected in co-bit or in maintenance, or detect on the 10kV 1M bus of described interchange transmission and distribution network or the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus all no-voltages, or the transformer B1 main transformer high side switch DL1 hand of the receiving described interchange transmission and distribution network hand of jumping signal or receiving transformer B1 main transformer low-side switch DL2 is while jumping signal, or while receiving transformer B1 main transformer backup protection signal, after t2 time delays, described backup auto-activating device electric discharge.
A kind of method that the present invention also provides interchange and flexible direct current hybrid power supply region spare power automatic switching method, the method to be specially to act on the backup auto-activating device in aforementioned interchange and flexible direct current hybrid power supply region to discharge, comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device is exiting position;
Whether detect the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network or described positive direct-current bus in co-bit, or be inspecting state;
Whether detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network, described flexible direct current transmission and distribution network, negative DC bus no-voltage;
Detect the hand of the transformer B2 main transformer high-pressure side DC switch DL3 that whether receives flexible direct current transmission and distribution network and jump signal;
Detect and whether receive the transformer B2 main transformer low-pressure side DC contact switch QFP1 of flexible direct current transmission and distribution network or the hand of QFP2 jumping signal;
Detect the main transformer backup protection signal of whether receiving transformer B2;
When the prepared auto restart function pressing plate of described backup auto-activating device being detected, exiting position, or the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network or described positive direct-current bus detected in co-bit or in maintenance, or detect on the 10kV 1M bus of described interchange transmission and distribution network or the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus all no-voltages, or the transformer B2 main transformer high side switch DL3 hand of the receiving described flexible direct current transmission and distribution network hand of jumping signal or receiving transformer B2 main transformer low-pressure side DC contact switch QFP1 or QFP2 is while jumping signal, or while receiving transformer B2 main transformer backup protection signal, after t2 time delays, described backup auto-activating device electric discharge.
The present invention also provides a kind of interchange and flexible direct current hybrid power supply region spare power automatic switching method, and this spare power automatic switching method is specially the method for operating of the backup auto-activating device that acts on aforesaid interchange and flexible direct current hybrid power supply region prepared auto restart configuration-system, comprising:
Whether the 10 kV 1M buses that detect described interchange transmission and distribution network decompression;
Whether the original load capacity P1 detecting on 10 kV 1M buses of described interchange transmission and distribution network is less than the negative DC bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus;
Whether the transformer B1 step-down side that detects described interchange transmission and distribution network no current;
When 10 kV 1M bus loss of pressure of described interchange transmission and distribution network being detected, and the original load capacity P1 detecting on 10 kV 1M buses of described interchange transmission and distribution network is less than the negative DC bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus, and while the transformer B1 step-down side no current of described interchange transmission and distribution network being detected, the time delay t3 time, simultaneously transformer B1 becomes low side switch DL2 described in tripping again;
In time delay t4, if receive, transformer B1 becomes low side switch DL2 into a minute position signal, and prepared auto restart drops into QFP1 and QFP2 interconnection switch simultaneously automatically, and backup auto-activating device shows to be hauled oneself willingly into successfully;
If in time delay t4, do not receive that transformer B1 becomes low side switch DL2 into a minute position signal, backup auto-activating device shows hauls oneself willingly into failure.
The present invention also provides a kind of interchange and flexible direct current hybrid power supply region spare power automatic switching method, and this spare power automatic switching method is specially the method for operating of the backup auto-activating device that acts on aforesaid interchange and flexible direct current hybrid power supply region prepared auto restart configuration-system, comprising:
Detect whether decompression of the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus;
Whether the original load capacity P1 detecting on 10 kV 1M buses of described interchange transmission and distribution network is greater than the negative DC bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus;
Whether the transformer B2 step-down side that detects described flexible direct current transmission and distribution network no current;
When positive direct-current bus and the negative DC bus decompression of described flexible direct current transmission and distribution network being detected, and the original load capacity P1 detecting on 10 kV 1M buses of described interchange transmission and distribution network is greater than the negative DC bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus, and while the transformer B2 step-down side no current of described flexible direct current transmission and distribution network being detected, the time delay t3 time, backup auto-activating device starts; Simultaneously transformer B2 step-down side DC contact switch QFP1 and DC contact switch QFP2 described in tripping again;
In time delay t4, if receive, transformer B2 step-down side DC contact switch QFP1 and DC contact switch QFP2 are for a minute position signal, prepared auto restart automatically drops into and exchanges the 10kV 1M bus of transmission and distribution network and the interconnection switch QFP1 of the positive direct-current bus of flexible direct current transmission and distribution network and the interconnection switch QFP2 of negative DC bus simultaneously, and backup auto-activating device shows to be hauled oneself willingly into successfully;
If in time delay t4, do not receive that transformer B2 step-down side DC contact switch QFP1 and DC contact switch QFP2 are for a minute position signal, backup auto-activating device shows hauls oneself willingly into failure.
The present invention proposes a kind of prepared auto restart configuration-system of alternating current-direct current hybrid power supply regional distribution network and method and can be better during exchanging transmission and distribution network and the hybrid power supply of flexible direct current transmission and distribution network, avoids exchanging transmission and distribution network region and flexible direct current power distribution network region becomes isolated island, the interconnect problem of two kinds of Grids.
Accompanying drawing explanation
Fig. 1 is for exchanging transmission and distribution network region and flexible direct current power distribution network region hybrid power supply area schematic;
Fig. 2 is the structural representation of the prepared auto restart configuration-system in interchange provided by the invention and flexible direct current hybrid power supply region;
Fig. 3 is converter valve operation principle flow path schematic diagram in the prepared auto restart configuration-system in interchange provided by the invention and flexible direct current hybrid power supply region;
Fig. 4 is charging process logical schematic in the spare power automatic switching method embodiment mono-in interchange provided by the invention and flexible direct current hybrid power supply region;
Fig. 5 is discharge process logical schematic in the spare power automatic switching method embodiment mono-in interchange provided by the invention and flexible direct current hybrid power supply region;
Fig. 6 is prepared auto restart process logic schematic diagram in the spare power automatic switching method embodiment mono-in interchange provided by the invention and flexible direct current hybrid power supply region;
Fig. 7 is charging process logical schematic in the spare power automatic switching method embodiment bis-in interchange provided by the invention and flexible direct current hybrid power supply region;
Fig. 8 is discharge process logical schematic in the spare power automatic switching method embodiment bis-in interchange provided by the invention and flexible direct current hybrid power supply region;
Fig. 9 is prepared auto restart process logic schematic diagram in the spare power automatic switching method embodiment bis-in interchange provided by the invention and flexible direct current hybrid power supply region.
Embodiment
The embodiment of the present invention proposes a kind of prepared auto restart configuration-system and method of alternating current-direct current hybrid power supply regional distribution network.For better becoming isolated island for fear of exchanging transmission and distribution network region and flexible direct current power distribution network region during hybrid power supply, solving the interconnect problem of two kinds of Grids.
Fig. 2 is the structural representation of the prepared auto restart configuration-system in interchange provided by the invention and flexible direct current hybrid power supply region.
As shown in Figure 2, exchange with the prepared auto restart configuration-system in flexible direct current hybrid power supply region and comprise:
10kV ac bus bridge, it is connected with the 10kV 1M bus of described interchange transmission and distribution network, for converging 10KV AC energy;
Negative DC bus bridge, it is connected with the negative DC bus of described flexible direct current transmission and distribution network;
Positive direct-current bus bridge, it is connected with the positive direct-current bus of described flexible direct current transmission and distribution network;
Described negative DC bus bridge and positive direct-current bus bridge are for converging the direct current energy of described flexible direct current transmission and distribution network;
Contact reactor LP, it is connected with described 10kV ac bus bridge, its voltage source converter that is described flexible direct current transmission and distribution network with exchange transmission and distribution network and carry out quality of power supply exchange; Play filter action simultaneously.
Contact converter valve brachium pontis, it is connected with described contact reactor, takes three-phase (A, B, C) two level bridge architectures, comprises turn-off device VTP1, turn-off device VTP2, fly-wheel diode VDP1 and VDP2;
Concrete, as shown in Figure 3, contact converter valve brachium pontis operation principle following (A of take is example mutually):
Upper and lower two disconnected device valves of contact converter valve brachium pontis have four kinds of different current paths, as shown in 3.When the broken device element VTP1 of first brachium pontis triggers, if electric current for just, circulation path from capacitance cathode end through turn-off device VTP1 to output, middle a path as shown in Figure 3; If electric current is for negative, circulation path from output through fly-wheel diode VDP1 to capacitance cathode end, as shown in 3 in b path.When the broken device VTP2 of half brachium pontis triggers instantly, if electric current for just, circulation path from electric capacity negative polarity end through fly-wheel diode VDP2 to output, middle d path as shown in Figure 3; If electric current is for negative, circulation path from output through turn-off device VTa2 to electric capacity negative polarity end, as shown in Figure 3 in c path.B, C phase and A are similar, repeat no more.
Contact DC capacitor CP1 one end is connected with described turn-off device VTP1, and contact DC capacitor CP2 one end is connected with described turn-off device VTP2, and contact DC capacitor CP1 is connected and ground connection with the other end of contact DC capacitor CP2; This contact DC capacitor CP1 and contact DC capacitor CP2 are used to voltage source converter to provide direct voltage to support, and cushion turn-off device VTP1 and the impulse current of turn-off device VTP2 when turn-offing of described contact converter valve brachium pontis, reduce DC side harmonics;
Earth point d is drawn in the normally bipolar operation of flexible electrical power trans mission/distribution system of contact DC terminal in the middle of two group capacitor CP1, the CP2 of symmetry, and earth point d keeps DC terminal the two poles of the earth balance, the direct current equal and opposite in direction of the upper and lower utmost point while normally moving, opposite direction.
Contact DC switch QFP1 and contact DC switch QFP2 connect with described positive direct-current bus bridge and negative DC bus bridging respectively, play buffer action when fault.
Introduction is acted on to the spare power automatic switching method of the backup auto-activating device of above-mentioned interchange and flexible direct current transmission and distribution network prepared auto restart configuration-system below.
First it should be noted that, so-called backup auto-activating device in the present invention, refer to that stand-by power supply drops into operative installations automatically, be called for short backup auto-activating device, it act as: at working power sudden failure or abnormal in the situation that, automatic put-in spair power source, the electricity consumption that recovers rapidly decompression equipment, guarantees the continuity of powering.
So-called spare power automatic switching method in the present invention, is backup auto-activating device and charges, the method for operating such as electric discharge and input.
In order to improve, exchange and the adaptability of flexible direct current hybrid power supply region prepared auto restart to operational mode, prepared auto restart charging, electric discharge, method of operating can be divided into mode 1 and mode 2, below will describe respectively.
The charging process of mode 1 as shown in Figure 4.
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into position;
Whether detect the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network and described positive direct-current bus in a minute position, and be not inspecting state;
Detect on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus and whether all have voltage;
Whether detect the transformer B1 main transformer low-side switch DL2 of interchange transmission and distribution network in co-bit;
Concrete charging process is as follows:
1. " prepared auto restart function pressing plate " detected and drop into position.
2. interchange and flexible direct current interconnection switch (QFP1, QFP2) detected all in " minute position ", and for overhauling.
3. 10 kV1M detected and positive and negative DC bus all has voltage.
4. B1 main transformer low-side switch DL2 detected in co-bit.
Meet above-mentioned condition after t1 time delays in charged state
The concrete charging process of described mode 1 realizes, " prepared auto restart function pressing plate " drop into position, 10kV 1M and positive and negative DC bus all have voltage, (DL2) in co-bit, QFP1, QFP2 all in " minute position ", and for maintenance etc. forms altogether and door (&), after t1 time delays, charge successfully.
Accordingly, discharge process is as follows, first carries out following detection:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device is exiting position;
Whether detect the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network or described positive direct-current bus in co-bit, or be inspecting state;
Whether detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network, described flexible direct current transmission and distribution network, negative DC bus no-voltage;
Detect the hand jumping signal of whether receiving the transformer B1 main transformer high side switch DL1 that exchanges transmission and distribution network;
Detect the hand jumping signal of whether receiving the transformer B1 main transformer low-side switch DL2 that exchanges transmission and distribution network;
Detect the main transformer backup protection signal of whether receiving transformer B1;
Possess one of condition electric discharge below, logic diagram as shown in Figure 5
1. " prepared auto restart function pressing plate " exiting position
2. QFP1 or QFP2 interconnection switch are all in " co-bit " or maintenance
3. 10 kV1M are with no pressure, time delay 5s discharge (simultaneously sending out alarm signal)
4. positive direct-current bus is with no pressure, time delay 5s discharge (simultaneously sending out alarm signal)
5. negative DC bus is with no pressure, time delay 5s discharge (simultaneously sending out alarm signal)
6. receive that B1 uprises switch DL1 hand and jumps signal
7. receive B1 step-down switch DL2 hand jumping signal
8. receive B1 main transformer backup protection signal
The concrete discharge process of described mode 1 is achieved as follows:
" prepared auto restart function pressing plate " exit position, 10 kV1M or positive and negative DC bus all with no pressure, QFP1 or QFP2 interconnection switch all in " co-bit " or maintenance, receive that B1 uprises switch DL1 hand and jumps signal; Receive B1 step-down switch DL2 hand jumping signal; Receive the formations such as B1 main transformer backup protection signal or door (>=), after t2 time delays, charge successfully.
Accordingly, the process that backup auto-activating device moves is as follows:
1. 10 kV 1M decompressions detected.
2. P1 < P2(P1 is original load capacity on 10 kV 1M; P2 is DC side load capacity)
3. B1 step-down transformer step-down side is without stream (can adjust by no flow setpoint)
Meeting above-mentioned condition time delay t3 device starts; Jump B1 step-down transformer again and become low side switch (DL2), in time delay t4, if receive, B1 step-down transformer becomes low side switch (DL2) into a minute position signal simultaneously, and prepared auto restart drops into QFP1 and QFP2 interconnection switch simultaneously automatically, and device shows to be hauled oneself willingly into successfully; If in time delay t4, do not receive that B1 step-down transformer becomes low side switch (DL2) into a minute position signal, device shows hauls oneself willingly into failure.Logic diagram as shown in Figure 6.
The concrete course of action of described mode 1 is realized, and 10 kV 1M decompressions detected; P1 < P2(P1 is original load capacity on 10 kV 1M; P2, for preparing prepared auto restart load capacity, is exactly to prepare from DC side the load capacity dropping into); B1 step-down transformer step-down side forms with door (&) device and starts without stream (can adjust by no flow setpoint), after t3 time delays, jump DL2, device receives that DL2 and time delay t4 form and door (&), and prepared auto restart drops into QFP1 and QFP2 interconnection switch simultaneously automatically.
The charging process of mode 2 as shown in Figure 7.
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into position;
Whether detect the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network and described positive direct-current bus in a minute position, and be not inspecting state;
Detect on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus and whether all have voltage;
Whether the transformer B2 main transformer low-pressure side DC switch QF1 of detection flexible direct current transmission and distribution network and DC switch QF2 be in co-bit;
Charging process:
1. " prepared auto restart function pressing plate " drops into position.
2. exchange with flexible direct current interconnection switch (QFP1, QFP2) all in " minute position ", and be not maintenance.
3. 10 kV 1M and positive and negative DC bus all have voltage.
4. B2 main transformer low-pressure side DC switch (QFP1, QFP2) is all in co-bit.
Meet above-mentioned condition after t1 time delays in charged state.
The concrete charging process of described mode 2 is achieved as follows:
" prepared auto restart function pressing plate " all has voltage, QFP1, QFP2 all in " minute position " at input position, 10 kV1M and positive and negative DC bus, and not for maintenance, QF1 and QF2 are all in co-bit, and for maintenance etc. forms altogether and door (&), after t1 time delays, charge successfully.
The discharge process of mode 2 is as follows:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device is exiting position;
Whether detect the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network or described positive direct-current bus in co-bit, or be inspecting state;
Whether detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network, described flexible direct current transmission and distribution network, negative DC bus no-voltage;
Detect the hand of the transformer B2 main transformer high-pressure side DC switch DL3 that whether receives flexible direct current transmission and distribution network and jump signal;
Detect and whether receive the transformer B2 main transformer low-pressure side DC contact switch QFP1 of flexible direct current transmission and distribution network or the hand of QFP2 jumping signal;
Detect the main transformer backup protection signal of whether receiving transformer B2;
Possesses one of condition electric discharge below.Logic diagram as shown in Figure 8
1. " prepared auto restart function pressing plate " exiting position
2. 10 kV1M and positive and negative DC bus interconnection switch QFP1 or QFP2 be all in " co-bit ", and be maintenance
3. 10 kV1M are with no pressure, time delay 5s discharge (simultaneously sending out alarm signal)
4. positive direct-current bus is with no pressure, time delay 5s discharge (simultaneously sending out alarm signal)
5. negative DC bus is with no pressure, time delay 5s discharge (simultaneously sending out alarm signal)
6. receive that B2 uprises switch DL3 hand and jumps signal
7. receive B2 step-down switch QFP1 or QFP2 hand jumping signal
8. receive B2 main transformer backup protection signal
The concrete discharge process of described mode 2 is achieved as follows:
" prepared auto restart function pressing plate " exiting position, 10 kV1M and positive and negative DC bus interconnection switch QFP1 or QFP2 all in " co-bit ", and for maintenance, 10 kV1M or positive and negative DC bus are with no pressure, receive that B2 uprises switch DL1 hand and jumps signal; Receive B2 step-down switch QF1 or QF2 hand jumping signal; Receive the formations such as B2 main transformer backup protection signal or door (>=), after t2 time delays, charge successfully.
As shown in Figure 9, its process is as follows for the action logic figure of mode 2:
Detect whether decompression of the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus;
Whether the original load capacity P1 detecting on 10 kV 1M buses of described interchange transmission and distribution network is greater than the negative DC bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus;
Whether the transformer B2 step-down side that detects described flexible direct current transmission and distribution network no current;
1. the equal decompression of positive and negative DC bus detected simultaneously.
2. P1 > P2(P1 is original load capacity on 10 kV 1M; P2 is DC side load capacity)
3. B2 step-down transformer step-down side is without stream (can adjust by no flow setpoint)
Meeting above-mentioned condition time delay t3 device starts; Jump again B2 step-down DC switch QF1 and QF2 simultaneously, in time delay t4, if receive, receive jumping B2 step-down DC switch QF1 and QF2 simultaneously and be a minute position signal, prepared auto restart drops into 10 kV1M and positive and negative DC bus interconnection switch QFP1 or QFP2 automatically simultaneously, and device shows to be hauled oneself willingly into successfully; If in time delay t4, do not receive 10 kV1M and positive and negative DC bus interconnection switch QFP1 or QFP2, device shows hauls oneself willingly into failure.
The embodiment of the present invention proposes a kind of prepared auto restart configuration-system and method of alternating current-direct current hybrid power supply regional distribution network, can during hybrid power supply, for fear of exchanging transmission and distribution network region and flexible direct current power distribution network region, become isolated island, solve the interconnect problem of two kinds of Grids.
Above disclosed is only preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the claims in the present invention, still belongs to the scope that the present invention is contained.
Claims (7)
1. the prepared auto restart configuration-system in interchange and flexible direct current hybrid power supply region, is characterized in that, comprising:
10kV ac bus bridge, it is connected with the 10kV 1M bus of described interchange transmission and distribution network, for converging 10KV AC energy;
Negative DC bus bridge, it is connected with the negative DC bus of described flexible direct current transmission and distribution network;
Positive direct-current bus bridge, it is connected with the positive direct-current bus of described flexible direct current transmission and distribution network;
Described negative DC bus bridge and positive direct-current bus bridge are for converging the direct current energy of described flexible direct current transmission and distribution network;
Contact reactor, it is connected with described 10kV ac bus bridge, its voltage source converter that is described flexible direct current transmission and distribution network with exchange transmission and distribution network and carry out quality of power supply exchange;
Contact converter valve brachium pontis, it is connected with described contact reactor, takes three-phase two level bridge architectures, comprises turn-off device VTP1, turn-off device VTP2, fly-wheel diode VDP1 and VDP2;
Contact DC capacitor CP1 one end is connected with described turn-off device VTP1, and contact DC capacitor CP2 one end is connected with described turn-off device VTP2, and contact DC capacitor CP1 is connected and ground connection with the other end of contact DC capacitor CP2; This contact DC capacitor CP1 and contact DC capacitor CP2 are used to voltage source converter to provide direct voltage to support, and cushion turn-off device VTP1 and the impulse current of turn-off device VTP2 when turn-offing of described contact converter valve brachium pontis, reduce DC side harmonics;
Contact DC switch QFP1 and contact DC switch QFP2 connect with described positive direct-current bus bridge and negative DC bus bridging respectively, play buffer action when fault.
2. an interchange and flexible direct current hybrid power supply region spare power automatic switching method, it is characterized in that, the method is specially to act on and exchanges the method that the backup auto-activating device with the prepared auto restart configuration-system in flexible direct current hybrid power supply region charges described in claim 1, comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into position;
Whether detect the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network and described positive direct-current bus in a minute position, and be not inspecting state;
Detect on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus and whether all have voltage;
Whether detect the transformer B1 main transformer low-side switch DL2 of interchange transmission and distribution network in co-bit;
When the prepared auto restart function pressing plate that described backup auto-activating device detected is in placement position, the DC contact switch QFP2 connecting on the DC contact switch QFP1 connecting on the negative DC bus of described flexible direct current transmission and distribution network and described positive direct-current bus is all in a minute position, and be not maintenance, on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus, all there is voltage, the transformer B1 main transformer low-side switch DL2 of described interchange transmission and distribution network is when co-bit, after t1 time delays, give described backup auto-activating device charging.
3. an interchange and flexible direct current hybrid power supply region spare power automatic switching method, it is characterized in that, the method is specially to act on and exchanges the method that the backup auto-activating device with the prepared auto restart configuration-system in flexible direct current hybrid power supply region charges described in claim 1, comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into position;
Whether detect the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network and described positive direct-current bus in a minute position, and be not inspecting state;
Detect on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus and whether all have voltage;
Whether the transformer B2 main transformer low-pressure side DC switch QF1 of detection flexible direct current transmission and distribution network and DC switch QF2 be in co-bit;
When the prepared auto restart function pressing plate that described backup auto-activating device detected is in placement position, the DC contact switch QFP2 connecting on the DC contact switch QFP1 connecting on the negative DC bus of described flexible direct current transmission and distribution network and described positive direct-current bus is all in a minute position, and be not maintenance, on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus, all there is voltage, the transformer B2 main transformer low-pressure side DC switch QF1 of described flexible direct current transmission and distribution network and DC switch QF2 are in co-bit, after t1 time delays, give described backup auto-activating device charging.
4. an interchange and flexible direct current hybrid power supply region spare power automatic switching method, it is characterized in that, the method is specially to act on and exchanges the method that the backup auto-activating device with the prepared auto restart configuration-system in flexible direct current hybrid power supply region discharges described in claim 1, comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device is exiting position;
Whether detect the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network or described positive direct-current bus in co-bit, or be inspecting state;
Whether detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network, described flexible direct current transmission and distribution network, negative DC bus no-voltage;
Detect the hand jumping signal of whether receiving the transformer B1 main transformer high side switch DL1 that exchanges transmission and distribution network;
Detect the hand jumping signal of whether receiving the transformer B1 main transformer low-side switch DL2 that exchanges transmission and distribution network;
Detect the main transformer backup protection signal of whether receiving transformer B1;
When the prepared auto restart function pressing plate of described backup auto-activating device being detected, exiting position, or the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network or described positive direct-current bus detected in co-bit or in maintenance, or detect on the 10kV 1M bus of described interchange transmission and distribution network or the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus all no-voltages, or the transformer B1 main transformer high side switch DL1 hand of the receiving described interchange transmission and distribution network hand of jumping signal or receiving transformer B1 main transformer low-side switch DL2 is while jumping signal, or while receiving transformer B1 main transformer backup protection signal, after t2 time delays, described backup auto-activating device electric discharge.
5. an interchange and flexible direct current hybrid power supply region spare power automatic switching method, it is characterized in that, the method is specially to act on and exchanges the method that the backup auto-activating device with the prepared auto restart configuration-system in flexible direct current hybrid power supply region discharges described in claim 1, comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device is exiting position;
Whether detect the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network or described positive direct-current bus in co-bit, or be inspecting state;
Whether detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network, described flexible direct current transmission and distribution network, negative DC bus no-voltage;
Detect the hand of the transformer B2 main transformer high-pressure side DC switch DL3 that whether receives flexible direct current transmission and distribution network and jump signal;
Detect and whether receive the transformer B2 main transformer low-pressure side DC contact switch QFP1 of flexible direct current transmission and distribution network or the hand of QFP2 jumping signal;
Detect the main transformer backup protection signal of whether receiving transformer B2;
When the prepared auto restart function pressing plate of described backup auto-activating device being detected, exiting position, or the DC contact switch QFP2 that connects on the DC contact switch QFP1 that connects on the negative DC bus of described flexible direct current transmission and distribution network or described positive direct-current bus detected in co-bit or in maintenance, or detect on the 10kV 1M bus of described interchange transmission and distribution network or the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus all no-voltages, or the transformer B2 main transformer high side switch DL3 hand of the receiving described flexible direct current transmission and distribution network hand of jumping signal or receiving transformer B2 main transformer low-pressure side DC contact switch QFP1 or QFP2 is while jumping signal, or while receiving transformer B2 main transformer backup protection signal, after t2 time delays, described backup auto-activating device electric discharge.
6. an interchange and flexible direct current hybrid power supply region spare power automatic switching method, it is characterized in that, this spare power automatic switching method is specially the method for operating of the backup auto-activating device that acts on interchange claimed in claim 1 and flexible direct current hybrid power supply region prepared auto restart configuration-system, comprising:
Whether the 10 kV 1M buses that detect described interchange transmission and distribution network decompression;
Whether the original load capacity P1 detecting on 10 kV 1M buses of described interchange transmission and distribution network is less than the negative DC bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus;
Whether the transformer B1 step-down side that detects described interchange transmission and distribution network no current;
When 10 kV 1M bus loss of pressure of described interchange transmission and distribution network being detected, and the original load capacity P1 detecting on 10 kV 1M buses of described interchange transmission and distribution network is less than the negative DC bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus, and while the transformer B1 step-down side no current of described interchange transmission and distribution network being detected, the time delay t3 time, simultaneously transformer B1 becomes low side switch DL2 described in tripping again;
In time delay t4, if receive, transformer B1 becomes low side switch DL2 into a minute position signal, and prepared auto restart drops into DC contact switch QFP1 and DC contact switch QFP2 simultaneously automatically, and backup auto-activating device shows to be hauled oneself willingly into successfully;
If in time delay t4, do not receive that transformer B1 becomes low side switch DL2 into a minute position signal, backup auto-activating device shows hauls oneself willingly into failure.
7. an interchange and flexible direct current hybrid power supply region spare power automatic switching method, it is characterized in that, this spare power automatic switching method is specially the method for operating of the backup auto-activating device that acts on interchange claimed in claim 1 and flexible direct current hybrid power supply region prepared auto restart configuration-system, comprising:
Detect whether decompression of the positive direct-current bus of described flexible direct current transmission and distribution network and negative DC bus;
Whether the original load capacity P1 detecting on 10 kV 1M buses of described interchange transmission and distribution network is greater than the negative DC bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus;
Whether the transformer B2 step-down side that detects described flexible direct current transmission and distribution network no current;
When positive direct-current bus and the negative DC bus decompression of described flexible direct current transmission and distribution network being detected, and the original load capacity P1 detecting on 10 kV 1M buses of described interchange transmission and distribution network is greater than the negative DC bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus, and while the transformer B2 step-down side no current of described flexible direct current transmission and distribution network being detected, the time delay t3 time, backup auto-activating device starts; Simultaneously transformer B2 step-down side DC contact switch QFP1 and DC contact switch QFP2 described in tripping again;
In time delay t4, if receive, transformer B2 step-down side DC contact switch QFP1 and DC contact switch QFP2 are for a minute position signal, prepared auto restart automatically drops into and exchanges the 10kV 1M bus of transmission and distribution network and the interconnection switch QFP1 of the positive direct-current bus of flexible direct current transmission and distribution network and the interconnection switch QFP2 of negative DC bus simultaneously, and backup auto-activating device shows to be hauled oneself willingly into successfully;
If in time delay t4, do not receive that transformer B2 step-down side DC contact switch QFP1 and DC contact switch QFP2 are for a minute position signal, backup auto-activating device shows hauls oneself willingly into failure.
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| CN108023337B (en) * | 2016-10-31 | 2019-07-23 | 南京南瑞继保电气有限公司 | A kind of flexible HVDC transmission system inverter operates in failure current limit control and protection fitting method under island state |
| CN109412166B (en) * | 2018-11-13 | 2022-01-11 | 国网江苏省电力有限公司镇江供电分公司 | Dynamic voltage recovery system based on double-bus cross power supply |
| US11031773B2 (en) * | 2019-03-27 | 2021-06-08 | Abb Power Grids Switzerland Ag | Transformer isolation response using direct current link |
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