CN103138295B - Spare power automatic switching load sharing system and method for alternating current and flexible direct current hybrid power supply area - Google Patents
Spare power automatic switching load sharing system and method for alternating current and flexible direct current hybrid power supply area Download PDFInfo
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Abstract
The invention provides a backup power automatic switching load sharing system and method for an alternating current and flexible direct current hybrid power supply area, wherein the system comprises: a 10kV alternating current bus bridge, a negative direct current bus bridge and a positive direct current bus bridge; the connection reactor is connected with the 10kV alternating current bus bridge; the interconnection converter valve bridge arm is connected with the interconnection reactor; when a transformer B1 of the AC power transmission and distribution network region trips, load is equally divided by the interconnection direct current switch QFP1 and the interconnection direct current switch QFP 2; or when the transformer B3 of the flexible direct current transmission and distribution network region trips, the load is equally divided by the interconnection switch FDL between the 10kV1M bus and the 10kV2M bus of the alternating current transmission and distribution network region. The invention can avoid the serious overload and insulation damage of the transformer in the power supply area of the alternating current transmission and distribution network.
Description
Technical field
The present invention relates to exchange and flexible direct current transmission and distribution network prepared auto restart configuring technical field, the prepared auto restart that relates in particular to a kind of alternating current-direct current hybrid power supply regional distribution network is divided equally load system and method.
Background technology
At present, the most of town and country of China distribution network system all 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, power transmission and distribution barrier, not all power supply area all possesses condition and the opportunity of boosting at once, certainly exists the region that the power distribution network of two kinds of heterogeneity grades coexists, and also exchanges power transmission and distribution barrier and hybrid power supply region, flexible direct current distribution barrier.Specifically as shown in Figure 1.
How during the transformation in this region, to guarantee system reliability service on the one hand, take into account again the interconnected of former interchange transmission and distribution network and the new flexible direct current transmission and distribution network of building, and can divide equally load and avoid transformer to cause that to damage be a technical problem urgently to be resolved hurrily.
Summary of the invention
In order to solve the technical problem existing in above-mentioned prior art, the invention provides a kind of interchange and divide equally load system and method with flexible direct current hybrid power supply region prepared auto restart.
A kind of interchange provided by the invention is divided equally load system with flexible direct current hybrid power supply region prepared auto restart, comprising: exchange transmission and distribution network region and flexible direct current transmission and distribution network region; And
10kV ac bus bridge, it is connected with the 10kV 2M 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;
When the transformer B1 in described interchange transmission and distribution network region tripping operation, by described contact DC switch QFP1 and contact DC switch QFP2, divide equally load; Or
When the transformer B3 in described flexible direct current transmission and distribution network region tripping operation, by the 10kV 1M bus in described interchange transmission and distribution network region and the interconnection switch FDL between 10kV 2M bus, divide equally load.
Accordingly, the present invention also provides a kind of interchange and flexible direct current hybrid power supply region prepared auto restart to divide equally load method, the method is specially described contact DC switch QFP1 and contact DC switch QFP2 divides equally while loading, the method of charging to the backup auto-activating device that acts on described interchange and flexible direct current hybrid power supply region, comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into position;
Whether the 10kV 1M bus and the interconnection switch FDL between 10kV 2M bus that detect described interchange transmission and distribution network region are dividing position, and be not inspecting state;
Detect on the positive direct-current bus of 10kV 1M bus, 10kV 2M bus and described flexible direct current transmission and distribution network of described interchange 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; Whether DL4 is in co-bit for transformer B2 low-side switch; Whether detect transformer B3 low-side switch QF1, the QF2 of described flexible direct current transmission and distribution network all in co-bit;
Whether detect described DC contact switch QFP1 and contact DC switch QFP2 load sharing pressing plate in input position;
Whether detect described DC contact switch QFP1 and contact DC switch QFP2 all in co-bit;
When the prepared auto restart function pressing plate that described backup auto-activating device detected is in placement position, the 10kV 1M bus in described interchange transmission and distribution network region and the interconnection switch FDL between 10kV 2M bus are in a minute position, and be not inspecting state, 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 in co-bit, and DL4 is in co-bit for transformer B2 low-side switch; Transformer B3 low-side switch QF1, the QF2 of described flexible direct current transmission and distribution network are all in co-bit; Described DC contact switch QFP1 and contact DC switch QFP2 load sharing pressing plate drop into position; Described DC contact switch QFP1 and contact DC switch QFP2 all, when co-bit, after t1 time delays, give described backup auto-activating device charging.
The present invention also provides a kind of interchange and flexible direct current hybrid power supply region prepared auto restart to divide equally load method, the method is specially described contact DC switch QFP1 and contact DC switch QFP2 divides equally while loading, act on the method that the backup auto-activating device in described interchange and flexible direct current hybrid power supply region carries out prepared auto restart action, comprising:
Detect the 10 kV 1M buses decompression whether of the transformer B1 low-pressure side of described interchange transmission and distribution network;
Whether the transformer B1 step-down side that detects described interchange transmission and distribution network no current;
When described 10 kV 1M bus loss of pressure being detected, and while the transformer B1 step-down side no current of described interchange transmission and distribution network being detected, the time delay t2 time, start backup auto-activating device; Simultaneously transformer B1 becomes low side switch DL2 described in tripping again;
Within the time delay t3 time, if receive, transformer B1 becomes low side switch DL2 into a minute position signal, and prepared auto restart drops into the 10kV 1M bus in described interchange transmission and distribution network region and the interconnection switch FDL between 10kV 2M bus simultaneously automatically;
If receive, described interconnection switch FDL is co-bit signal, the time delay t4 time, get in touch with DC switch QFP1 and contact DC switch QFP2 described in tripping, and realize contact DC switch QFP1, contact DC switch QFP2 divides equally burden functional.
The present invention also provides a kind of interchange and flexible direct current hybrid power supply region prepared auto restart to divide equally load method, 10kV 1M bus and the interconnection switch FDL between 10kV 2M bus that the method is specially described interchange transmission and distribution network region divide equally while loading, the method of charging to the backup auto-activating device that acts on described interchange and flexible direct current hybrid power supply region, comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into position;
Detect described DC contact switch QFP1 and DC contact switch QFP2 all whether in a minute position, and be not inspecting state;
Detect on the positive direct-current bus of 10kV 1M bus, 10kV 2M bus and described flexible direct current transmission and distribution network of described interchange 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; Whether DL4 is in co-bit for transformer B2 low-side switch; Whether detect transformer B3 low-side switch QF1, the QF2 of described flexible direct current transmission and distribution network all in co-bit;
Detect described interconnection switch FDL load sharing pressing plate and whether drop into position;
Whether detect described interconnection switch FDL in co-bit;
When the prepared auto restart function pressing plate that described backup auto-activating device detected is in placement position, described DC contact switch QFP1 and DC contact switch QFP2 are all in a minute position, and be not inspecting state, 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 in co-bit, and DL4 is in co-bit for transformer B2 low-side switch; Transformer B3 low-side switch QF1, the QF2 of described flexible direct current transmission and distribution network are all in co-bit; Described interconnection switch FDL load sharing pressing plate drops into position; Described interconnection switch FDL, when co-bit, after t1 time delays, gives described backup auto-activating device charging.
The present invention also provides a kind of interchange and flexible direct current hybrid power supply region prepared auto restart to divide equally load method, it is characterized in that, when the 10kV 1M bus in the concrete described interchange transmission and distribution network of the method region and the interconnection switch FDL between 10kV 2M bus divide equally load, act on the method that the backup auto-activating device in described interchange and flexible direct current hybrid power supply region carries out prepared auto restart action, comprising:
Detect whether decompression of the positive direct-current bus of transformer B3 low-pressure side of described flexible direct current transmission and distribution network and negative DC bus;
Whether the transformer B3 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 transformer B3 low-pressure side being detected, and during the transformer B3 step-down side no current of flexible direct current transmission and distribution network, the time delay t2 time, start backup auto-activating device; Simultaneously transformer B3 becomes low side switch QF1, QF2 described in tripping again;
Within the time delay t3 time, if receive, transformer B3 becomes low side switch QF1, QF2 into a minute position signal, and prepared auto restart drops into described DC contact switch QFP1 and DC contact switch QFP2 simultaneously automatically;
If receive, described DC contact switch QFP1 and DC contact switch QFP2 are co-bit signal, the time delay t4 time, described in tripping, exchange the 10kV 1M bus in transmission and distribution network region and the interconnection switch FDL between 10kV 2M bus, realize interconnection switch FDL and divide equally burden functional.
Implement the present invention, can improve the power supply reliability of this Mixed Zone, certain transformer in interchange and flexible direct current hybrid power supply region, as while exchanging the transformer B1 of transmission and distribution network power supply area or the transformer B3 in flexible direct current transmission and distribution network region action tripping operation, its low-voltage bus bar side backup auto-activating device action, by contact DC switch QFP1, contact DC switch QFP2 divides equally load, or divide equally load by exchanging the 10kV 1M bus in transmission and distribution network region and the interconnection switch FDL between 10kV 2M bus, can avoid exchanging the serious overload of transformer B2 and the insulation damages of transmission and distribution network power supply area.
Accompanying drawing explanation
Fig. 1 existing interchange power transmission and distribution barrier and flexible direct current distribution barrier hybrid power supply area schematic;
Fig. 2 is the schematic diagram that interchange provided by the invention and flexible direct current hybrid power supply region prepared auto restart are divided equally load system;
Fig. 3 is that interchange provided by the invention and flexible direct current hybrid power supply region prepared auto restart are divided equally charging process logical schematic in load method embodiment mono-;
Fig. 4 is that interchange provided by the invention and flexible direct current hybrid power supply region prepared auto restart are divided equally prepared auto restart course of action logical schematic in load method embodiment mono-;
Fig. 5 is that interchange provided by the invention and flexible direct current hybrid power supply region prepared auto restart are divided equally charging process logical schematic in load method embodiment bis-;
Fig. 6 is that interchange provided by the invention and flexible direct current hybrid power supply region prepared auto restart are divided equally prepared auto restart course of action logical schematic in load method embodiment bis-.
Embodiment
In to interchange transmission and distribution network transformation process, interchange power transmission and distribution website internal loading is turned to confession by all the other main transformers in other stations or station, successively to 110 kV(in transformer station or 220 kV) main transformer carries out part technological transformation, finally become a plurality of flexible direct current power transmission and distribution source points, for the website that possesses enlarging condition, directly extend as flexible direct current power transmission and distribution source point simultaneously, form and exchange transmission and distribution network and the flexible direct current transmission and distribution network Mixed Zone of newly building.Consider to adopt the two branches' (110 kV/10 kV or flexible direct current) of transformer.
Concrete interchange and flexible direct current hybrid power supply region prepared auto restart shown in Figure 2 divided equally load system.
Graphic symbol explanation in Fig. 2: DL1, DL2 are B1 both sides switches
DL3, DL4 are B2 both sides switches
DL5 is B3 high side switch
QF1, QF2 are respectively B3 low-pressure side DC switch
FDL is 10 kV1M and 2M interconnection switch
QFP1, QFP2 are respectively the DC switch of B2 low-pressure side and the contact of flexible direct current district
B1, B2, B3 are 110 kV/10 kV step-down transformers
1M is No. 1 bus
2M is No. 2 buses
3M is No. 3 buses
LP is trap
In oval, it is converter element;
QFP1 is connected with the positive direct-current bus in flexible direct current transmission and distribution network region, and QFP2 is connected with the negative DC bus in flexible direct current transmission and distribution network region;
In the interchange shown in Fig. 2 and flexible direct current hybrid power supply region prepared auto restart, divide equally in load system, by transformer B2 enlarging Cheng Shuan branch transformer (110 kV/10kV/ flexible direct current district), low-pressure side exchanges and flexible direct current district two branches with 10kV, its 10kV AC branch is connected with 10 kV sides of B1 low-pressure side, flexible direct current district side branch is connected with the flexible direct current district side of B3, forms 10 kV and exchanges and power supply Mixed Zone, flexible direct current district.
For improving the power supply reliability of this Mixed Zone, at 10kV, exchange with flexible direct current region installation backup auto-activating device and realize.Due to load high concentration, in Fig. 2 all may there is apportion overload operation in B1, B2, B3, if certain transformer (as B1 or B3) action tripping operation, now low-voltage bus bar side backup auto-activating device action, may make B2 transformer seriously overload, greatly shorten the life cycle of B2 transformer, serious situation also may cause transformer insulated damage.
In order to improve 10kV, exchange and flexible direct current hybrid power supply district transformer territory overload operation, a kind of interchange provided by the invention is divided equally load system with flexible direct current hybrid power supply region prepared auto restart, comprising: exchange transmission and distribution network region and flexible direct current transmission and distribution network region; And
10kV ac bus bridge, it is connected with the 10kV 2M 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;
When the transformer B1 in described interchange transmission and distribution network region tripping operation, by described contact DC switch QFP1 and contact DC switch QFP2, divide equally load; Or
When the transformer B3 in described flexible direct current transmission and distribution network region tripping operation, by the 10kV 1M bus in described interchange transmission and distribution network region and the interconnection switch FDL between 10kV 2M bus, divide equally load.
The invention provides to exchange and divide equally load system according to different situations from flexible direct current hybrid power supply region prepared auto restart, can be divided into that QFP1, QFP2 divide equally load and FDL divides equally the two kinds of situations of loading.To be introduced respectively below.
mode 1:QFP1, QFP2 divide equally burden functional
In mode 1, the method for charging to the backup auto-activating device that acts on described interchange and flexible direct current hybrid power supply region, comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into position;
Whether the 10kV 1M bus and the interconnection switch FDL between 10kV 2M bus that detect described interchange transmission and distribution network region are dividing position, and be not inspecting state;
Detect on the positive direct-current bus of 10kV 1M bus, 10kV 2M bus and described flexible direct current transmission and distribution network of described interchange 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; Whether DL4 is in co-bit for transformer B2 low-side switch; Whether detect transformer B3 low-side switch QF1, the QF2 of described flexible direct current transmission and distribution network all in co-bit;
Whether detect described DC contact switch QFP1 and contact DC switch QFP2 load sharing pressing plate in input position;
Whether detect described DC contact switch QFP1 and contact DC switch QFP2 all in co-bit;
When meeting the following conditions, after t1 time delays, backup auto-activating device is in charged state.Logic
Scheme as shown in Figure 3:
1. " prepared auto restart function pressing plate " drops into position.
2. the positive and negative DC bus in 10 kV 1M, 2MHe flexible direct current district all has voltage.
3. 10 kV1M and 2M interconnection switch (FDL) and " minute position ", and be not maintenance.
4. B1 step down side switch DL2 is in co-bit; B2 step down side switch DL4 is in co-bit; B3 step down side switch QF1, QF2 are all in co-bit.
5. QFP1, QFP2 load sharing pressing plate drop into.
6. QFP1, QFP2 interconnection switch are all in co-bit.
It is as follows that the prepared auto restart of mode 1 is crossed course of action:
Detect the 10 kV 1M buses decompression whether of the transformer B1 low-pressure side of described interchange transmission and distribution network;
Whether the transformer B1 step-down side that detects described interchange transmission and distribution network no current;
When meeting following condition, the time delay t2 time, backup auto-activating device starts;
1. B1 low-pressure side 10 kV 1M decompressions detected.
2. B1 step-down transformer step-down side is without stream.
When backup auto-activating device starts, jump again B1 step-down transformer and become low side switch (DL2), in time delay t3; If receive, B1 step-down transformer becomes low side switch (DL2) into a minute position signal, and prepared auto restart drops into the interconnection switch FDL between 10 kV1M and 2M automatically; If receive, the FDL between 10 kV1M and 2M interconnection switch is co-bit signal, and in time delay t4, QFP1, QFP2 interconnection switch are jumped in tripping, realizes QFP1, QFP2 interconnection switch is divided equally burden functional.
If receiving signalling demonstration, each link do not divide equally burden functional failure.Logic diagram as shown in Figure 4
mode 2:FDL divides equally burden functional
In mode 2, the method for charging to the backup auto-activating device that acts on described interchange and flexible direct current hybrid power supply region, comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into position;
Detect described DC contact switch QFP1 and DC contact switch QFP2 all whether in a minute position, and be not inspecting state;
Detect on the positive direct-current bus of 10kV 1M bus, 10kV 2M bus and described flexible direct current transmission and distribution network of described interchange 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; Whether DL4 is in co-bit for transformer B2 low-side switch; Whether detect transformer B3 low-side switch QF1, the QF2 of described flexible direct current transmission and distribution network all in co-bit;
Detect described interconnection switch FDL load sharing pressing plate and whether drop into position;
Whether detect described interconnection switch FDL in co-bit;
When meeting the following conditions, after t1 time delays, backup auto-activating device is in charged state.Logic
Scheme as shown in Figure 5:
1. " prepared auto restart function pressing plate " drops into position.
2. the positive and negative DC bus in 10 kV 1M, 2MHe flexible direct current district all has voltage.
3. QFP1, QFP2 interconnection switch be all in " minute position ", and be not maintenance.
4. B1 step down side switch DL2 is in co-bit; B2 step down side switch DL4 is in co-bit; B3 step down side switch QF1, QF2 are all in co-bit.
5. FDL load sharing pressing plate drops into.
6. 10 kV1M and 2M interconnection switch FDL are in co-bit.
It is as follows that the prepared auto restart of mode 2 is crossed course of action:
Detect whether decompression of the positive direct-current bus of transformer B3 low-pressure side of described flexible direct current transmission and distribution network and negative DC bus;
Whether the transformer B3 step-down side that detects described flexible direct current transmission and distribution network no current;
When meeting following condition time delay t2 after the time, backup auto-activating device starts;
1. the equal decompression of positive and negative DC bus in B3 low-pressure side flexible direct current district detected.
2. B3 step-down transformer step-down side is without stream (can adjust by no flow setpoint)
When backup auto-activating device starts, jump again B3 step-down transformer and become low side switch QF1, QF2, in time delay t3; If all receive, B3 step-down transformer becomes low side switch QF1, QF2 into a minute position signal, and prepared auto restart drops into QFP1, QFP2 interconnection switch automatically; If receive, QFP1, QFP2 interconnection switch are co-bit signal, and in time delay t4, tripping 10 kV1M and 2M interconnection switch FDL, realize FDL and divide equally burden functional.
If receiving signalling demonstration, each link do not divide equally burden functional failure.Logic diagram as shown in Figure 6
Implement the present invention, can improve the power supply reliability of this Mixed Zone, certain transformer in interchange and flexible direct current hybrid power supply region, as while exchanging the transformer B1 of transmission and distribution network power supply area or the transformer B3 in flexible direct current transmission and distribution network region action tripping operation, its low-voltage bus bar side backup auto-activating device action, by contact DC switch QFP1, contact DC switch QFP2 divides equally load, or divide equally load by exchanging the 10kV 1M bus in transmission and distribution network region and the interconnection switch FDL between 10kV 2M bus, can avoid exchanging the serious overload of transformer B2 and the insulation damages of transmission and distribution network power supply area.
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 (5)
1. interchange and flexible direct current hybrid power supply region prepared auto restart are divided equally a load system, it is characterized in that, comprising: exchange transmission and distribution network region and flexible direct current transmission and distribution network region; And
10kV ac bus bridge, it is connected with the 10kV 2M 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 in described flexible direct current transmission and distribution network region;
Positive direct-current bus bridge, it is connected with the positive direct-current bus in described flexible direct current transmission and distribution network region;
Described negative DC bus bridge and positive direct-current bus bridge are for converging the direct current energy in described flexible direct current transmission and distribution network region;
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 region with exchange transmission and distribution network and carry out quality of power supply exchange;
The first 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 first end is connected with described turn-off device VTP1, and contact DC capacitor CP2 first end is connected with described turn-off device VTP2, and the other end of 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 is all connected with described the first contact converter valve brachium pontis with contact DC switch QFP2, and described contact DC switch QFP1 first end is connected with described positive direct-current bus bridge, and its other end is connected with described contact DC capacitor CP1 first end; Described contact DC switch QFP2 first end and described negative DC bus bridging connect, and its other end is connected with described contact DC capacitor CP2 first end, and described contact DC switch QFP1 and contact DC switch QFP2 play buffer action when fault;
Transformer B1 high-pressure side is connected with 110 kV 1M buses by switch DL1, and low-pressure side is connected with 10 kV 1M buses by switch DL2;
Transformer B2 high-pressure side is connected with 110 kV 2M buses by switch DL3, and low-pressure side is connected with 10 kV 2M buses by switch DL4;
Transformer B2 enlarging Cheng Shuan branch transformer, its low-pressure side is with 10kV AC branch and flexible direct current district two branches, its 10kV AC branch is connected with 10 kV sides of transformer B1 low-pressure side by interconnection switch FDL, its flexible direct current district side branch is connected with the flexible direct current district side of transformer B3 with negative DC bus bridge by described positive direct-current bus bridge, forms 10 kV and exchanges and power supply Mixed Zone, flexible direct current district;
Transformer B3 high-pressure side is connected with 110 kV 3M buses by switch DL5, and low-pressure side is connected with flexible direct current district side by the second contact converter valve brachium pontis;
When the transformer B1 in described interchange transmission and distribution network region tripping operation, by described contact DC switch QFP1 and contact DC switch QFP2, divide equally load; Or
When the transformer B3 in described flexible direct current transmission and distribution network region tripping operation, by the 10kV 1M bus in described interchange transmission and distribution network region and the interconnection switch FDL between 10kV 2M bus, divide equally load.
2. an interchange and flexible direct current hybrid power supply region prepared auto restart are divided equally load method, it is characterized in that, the method is applied to a kind of interchange as claimed in claim 1 and divides equally load system with flexible direct current hybrid power supply region prepared auto restart, be specially described contact DC switch QFP1 and get in touch with DC switch QFP2 while dividing equally load, the method of charging to the backup auto-activating device that acts on described interchange and flexible direct current hybrid power supply region, comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into position;
Whether the 10kV 1M bus and the interconnection switch FDL between 10kV 2M bus that detect described interchange transmission and distribution network region are dividing position, and be not inspecting state;
Detect on the positive direct-current bus in 10kV 1M bus, 10kV 2M bus and described flexible direct current transmission and distribution network region of described interchange 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; Whether DL4 is in co-bit for transformer B2 low-side switch; Whether detect transformer B3 low-side switch QF1, the QF2 in described flexible direct current transmission and distribution network region all in co-bit;
Whether detect described DC contact switch QFP1 and contact DC switch QFP2 load sharing pressing plate in input position;
Whether detect described DC contact switch QFP1 and contact DC switch QFP2 all in co-bit;
When the prepared auto restart function pressing plate that described backup auto-activating device detected is in placement position, the 10kV 1M bus in described interchange transmission and distribution network region and the interconnection switch FDL between 10kV 2M bus are in a minute position, and be not inspecting state, on the positive direct-current bus in the 10kV 1M bus of described interchange transmission and distribution network and described flexible direct current transmission and distribution network region 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 in co-bit, and DL4 is in co-bit for transformer B2 low-side switch; Transformer B3 low-side switch QF1, the QF2 in described flexible direct current transmission and distribution network region are all in co-bit; Described DC contact switch QFP1 and contact DC switch QFP2 load sharing pressing plate drop into position; Described DC contact switch QFP1 and contact DC switch QFP2 all, 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 prepared auto restart are divided equally load method, it is characterized in that, the method is applied to a kind of interchange as claimed in claim 1 and divides equally load system with flexible direct current hybrid power supply region prepared auto restart, be specially described contact DC switch QFP1 and get in touch with DC switch QFP2 while dividing equally load, act on the method that the backup auto-activating device in described interchange and flexible direct current hybrid power supply region carries out prepared auto restart action, comprising:
Detect the 10 kV 1M buses decompression whether of the transformer B1 low-pressure side in described interchange transmission and distribution network region;
Whether the transformer B1 step-down side that detects described interchange transmission and distribution network region no current;
When described 10 kV 1M bus loss of pressure being detected, and while the transformer B1 step-down side no current in described interchange transmission and distribution network region being detected, the time delay t2 time, start backup auto-activating device; Simultaneously transformer B1 becomes low side switch DL2 described in tripping again;
Within the time delay t3 time, if receive, transformer B1 becomes low side switch DL2 into a minute position signal, and prepared auto restart drops into the 10kV 1M bus in described interchange transmission and distribution network region and the interconnection switch FDL between 10kV 2M bus simultaneously automatically;
If receive, described interconnection switch FDL is co-bit signal, the time delay t4 time, get in touch with DC switch QFP1 and contact DC switch QFP2 described in tripping, and realize contact DC switch QFP1, contact DC switch QFP2 divides equally burden functional.
4. an interchange and flexible direct current hybrid power supply region prepared auto restart are divided equally load method, it is characterized in that, the method is applied to a kind of interchange as claimed in claim 1 and divides equally load system with flexible direct current hybrid power supply region prepared auto restart, the 10kV 1M bus and the interconnection switch FDL between 10kV 2M bus that are specially described interchange transmission and distribution network region divide equally while loading, the method of charging to the backup auto-activating device that acts on described interchange and flexible direct current hybrid power supply region, comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into position;
Detect described DC contact switch QFP1 and DC contact switch QFP2 all whether in a minute position, and be not inspecting state;
Detect on the positive direct-current bus in 10kV 1M bus, 10kV 2M bus and described flexible direct current transmission and distribution network region of described interchange 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; Whether DL4 is in co-bit for transformer B2 low-side switch; Whether detect transformer B3 low-side switch QF1, the QF2 in described flexible direct current transmission and distribution network region all in co-bit;
Detect described interconnection switch FDL load sharing pressing plate and whether drop into position;
Whether detect described interconnection switch FDL in co-bit;
When the prepared auto restart function pressing plate that described backup auto-activating device detected is in placement position, described DC contact switch QFP1 and DC contact switch QFP2 are all in a minute position, and be not inspecting state, on the positive direct-current bus in the 10kV 1M bus of described interchange transmission and distribution network and described flexible direct current transmission and distribution network region 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 in co-bit, and DL4 is in co-bit for transformer B2 low-side switch; Transformer B3 low-side switch QF1, the QF2 in described flexible direct current transmission and distribution network region are all in co-bit; Described interconnection switch FDL load sharing pressing plate drops into position; Described interconnection switch FDL, when co-bit, after t1 time delays, gives described backup auto-activating device charging.
5. an interchange and flexible direct current hybrid power supply region prepared auto restart are divided equally load method, it is characterized in that, the method is applied to a kind of interchange as claimed in claim 1 and divides equally load system with flexible direct current hybrid power supply region prepared auto restart, the 10kV 1M bus and the interconnection switch FDL between 10kV 2M bus that are specially described interchange transmission and distribution network region divide equally while loading, act on the method that the backup auto-activating device in described interchange and flexible direct current hybrid power supply region carries out prepared auto restart action, comprising:
Detect whether decompression of the positive direct-current bus of transformer B3 low-pressure side in described flexible direct current transmission and distribution network region and negative DC bus;
Whether the transformer B3 step-down side that detects described flexible direct current transmission and distribution network region no current;
When positive direct-current bus and the negative DC bus decompression of transformer B3 low-pressure side being detected, and during the transformer B3 step-down side no current in flexible direct current transmission and distribution network region, the time delay t2 time, start backup auto-activating device; Simultaneously transformer B3 becomes low side switch QF1, QF2 described in tripping again;
Within the time delay t3 time, if receive, transformer B3 becomes low side switch QF1, QF2 into a minute position signal, and prepared auto restart drops into described DC contact switch QFP1 and DC contact switch QFP2 simultaneously automatically;
If receive, described DC contact switch QFP1 and DC contact switch QFP2 are co-bit signal, the time delay t4 time, described in tripping, exchange the 10kV 1M bus in transmission and distribution network region and the interconnection switch FDL between 10kV 2M bus, realize interconnection switch FDL and divide equally burden functional.
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| 交直流并联系统的换流母线电压稳定性分析;徐梅梅等;《电力系统自动化》;20090410;第33卷(第7期);第6-10页 * |
| 徐梅梅等.交直流并联系统的换流母线电压稳定性分析.《电力系统自动化》.2009,第33卷(第7期),第6-10页. * |
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