CN103138295A - System and method for averaging load of backup automatic switch in alternating current and soft direct current hybrid power supply area - Google Patents
System and method for averaging load of backup automatic switch in alternating current and soft direct current hybrid power supply area Download PDFInfo
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- CN103138295A CN103138295A CN2013100940120A CN201310094012A CN103138295A CN 103138295 A CN103138295 A CN 103138295A CN 2013100940120 A CN2013100940120 A CN 2013100940120A CN 201310094012 A CN201310094012 A CN 201310094012A CN 103138295 A CN103138295 A CN 103138295A
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Abstract
The invention provides a system and a method for averaging load of 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 electric reactor which is connected with the 10-kilovolt alternating current bus bridge and an interconnection electric reactor which is connected with the interconnection electric reactor. When a transformer B1 in the alternating current transmission and distribution power grid area trips, the load is averaged through an interconnection direct current switch QFP 1 and an interconnection direct current switch QFP 2; or when a transformer B3 in the soft direct current transmission and distribution power grid area trips, the load is averaged through interconnection switches FDL which are arranged between a 10-kilovolt and 1-megabyte bus and a 10-kilovolt and 2-megabyte bus. According to the system and the method for averaging load of the backup automatic switch in the alternating current and soft direct current hybrid power supply area, serious overload and destruction of insulation of the transformers in the alternating current transmission and distribution electric grid power supply area are avoided.
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 have been exposed in load density larger downtown area, and it is excessive voltage-drop to occur in the remote countryside area of underload, 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 the power supply of flexible direct current transmission and distribution network.
development along with power electronic device and control technology, novel semiconductor device-igbt (Insulated Gate Bipolar Transistor has appearred, IGBT) in the application of low-voltage system, make IGBT as voltage source converter (the Voltage-Sourced Converter of switching device, VSC), be used widely on the industrial drives device subsequently, after repeatedly upgrading through the voltage of subsequently IGBT device and capacity again, making the voltage source converter that adopts igbt to consist of use in the direct current transmission and distribution net becomes a reality.
Converter adopts IGBT valve and two level (or many level) three-phase mechanism in the direct current transmission and distribution net is used, and use pulse modulation technology (Pulse Width Modulation, PWM) control the situation of cut-offfing of IGBT valve, possess and make after above-mentioned functions the DC distribution net system that is consisted of by it be different from many aspects conventional direct current transmission and distribution, can overcome the multiclass problem that presents in conventional direct current transmission and distribution.This novel direct current transmission and distribution technology is 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: the flexible direct current electric line will lack a wire than present 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; The flexible direct current distribution network system generally adopts cable as the distribution network system passage in order to realize less failure rate, and the transmission capacity of cable is large, loss is little, life cycle is long, fed distance is unrestricted; The flexible direct current distribution network system adopts cable as the 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, the flexible direct current distribution network system is stable strong; The 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 the commutation failure problem; The active power that the flexible direct current distribution network system is carried and reactive power can independently be controlled fast; The flexible direct current distribution network system is built by separate periods, favorable expandability preferably; Fast recovery of power supply and black startup the after accident; Can be to passive mains supply etc.
But present interchange transmission and distribution network technology is born main status, and the flexible direct current distribution network system is to be transformed on interchange transmission and distribution network technical foundation mostly, it will be a long-term system engineering in transition process, according to modification Experience both domestic and external, whole engineering process may last up to about several years.
During this period, in exchanging transformation zone, power transmission and distribution barrier, not all power supply area all possesses condition and the opportunity of boosting at once, certainly exists the zone that the power distribution network of two kinds of heterogeneity grades coexists, and also namely exchanges power transmission and distribution barrier and hybrid power supply zone, flexible direct current distribution barrier.Specifically as shown in Figure 1.
How to guarantee system's reliability service on the one hand during the transformation in this zone, 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 is caused that to damage be a technical problem that needs to be resolved hurrily.
Summary of the invention
In order to solve the technical problem that exists in above-mentioned prior art, the invention provides a kind of interchange and divide equally load system and method with the regional prepared auto restart of flexible direct current hybrid power supply.
A kind of interchange provided by the invention is divided equally load system with the regional prepared auto restart of flexible direct current hybrid power supply, comprising: exchange transmission and distribution network zone and flexible direct current transmission and distribution network regional; And
10kV ac bus bridge, it is connected with the 10kV 2M bus of described interchange transmission and distribution network, is used for converging the 10KV AC energy;
Negative dc bus bridge, it is connected with the negative dc bus of described flexible direct current transmission and distribution network;
The 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 used for converging the direct current energy of described flexible direct current transmission and distribution network;
The contact reactor, it is connected with described 10kV ac bus bridge, its for the voltage source converter of described flexible direct current transmission and distribution network with exchange transmission and distribution network and carry out the quality of power supply and 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 connects and ground connection with the other end of being connected 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 zone tripping operation, divide equally load by described contact dc switch QFP1 and contact dc switch QFP2; Or
When the transformer B3 in described flexible direct current transmission and distribution network zone tripping operation, divide equally load by the 10kV 1M bus in described interchange transmission and distribution network zone and the interconnection switch FDL between 10kV 2M bus.
Accordingly, the present invention also provides the regional prepared auto restart of a kind of interchange and flexible direct current hybrid power supply to divide equally load method, the method is specially described contact dc switch QFP1 and contact dc switch QFP2 divides equally when loading, the method of charging for the backup auto-activating device act on described interchange and flexible direct current hybrid power supply zone comprises:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into the position;
Whether detect the 10kV 1M bus in described interchange transmission and distribution network zone and the interconnection switch FDL between 10kV 2M bus 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 whether voltage is all arranged;
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 the 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 in placement position, the 10kV 1M bus in described interchange transmission and distribution network zone 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, voltage is arranged all, 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 the position; Described dc contact switch QFP1 and contact dc switch QFP2 all when co-bit, after the t1 time delays, give described backup auto-activating device charging.
The present invention also provides the regional prepared auto restart of a kind of interchange and flexible direct current hybrid power supply to divide equally load method, the method is specially described contact dc switch QFP1 and contact dc switch QFP2 divides equally when loading, act on the method that the backup auto-activating device in described interchange and flexible direct current hybrid power supply zone carries out the 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 when 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; While is the described transformer B1 of tripping step-down side switch DL2 again;
At time-delay t3 in the time, if receive that transformer B1 step-down side switch DL2 is a minute position signal, prepared auto restart drops into the 10kV 1M bus in described interchange transmission and distribution network zone and the interconnection switch FDL between 10kV 2M bus simultaneously automatically;
If receive that described interconnection switch FDL is the co-bit signal, the time-delay t4 time, the described contact dc switch of tripping QFP1 and contact dc switch QFP2 realize that contact dc switch QFP1, contact dc switch QFP2 divide equally burden functional.
The present invention also provides the regional prepared auto restart of a kind of interchange and flexible direct current hybrid power supply to divide equally load method, the method is specially the 10kV 1M bus in described interchange transmission and distribution network zone and the interconnection switch FDL between 10kV 2M bus when dividing equally load, the method of charging for the backup auto-activating device act on described interchange and flexible direct current hybrid power supply zone comprises:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into the 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 whether voltage is all arranged;
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 the 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 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, voltage is arranged all, 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 the position; Described interconnection switch FDL after the t1 time delays, gives described backup auto-activating device charging when co-bit.
The present invention also provides the regional prepared auto restart of a kind of interchange and flexible direct current hybrid power supply 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 zone 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 zone carries out the 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 the positive direct-current bus that transformer B3 low-pressure side detected and negative dc bus decompression, 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; While is the described transformer B3 of tripping step-down side switch QF1, QF2 again;
In time, if receive that transformer B3 step-down side switch QF1, QF2 are a minute position signal, prepared auto restart drops into described dc contact switch QFP1 and dc contact switch QFP2 simultaneously automatically at time-delay t3;
If receive that described dc contact switch QFP1 and dc contact switch QFP2 are the co-bit signal, the time-delay t4 time, the 10kV 1M bus in the described interchange transmission and distribution network of tripping zone and the interconnection switch FDL between 10kV 2M bus realize that interconnection switch FDL divides equally burden functional.
implement the present invention, can improve the power supply reliability of this Mixed Zone, exchanging and certain transformer in flexible direct current hybrid power supply zone, as when exchanging the transformer B3 action tripping operation in the transformer B1 of transmission and distribution network power supply area or flexible direct current transmission and distribution network zone, 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 the 10kV 1M bus that exchanges the transmission and distribution network zone 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.
Description of drawings
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 the regional prepared auto restart of interchange provided by the invention and flexible direct current hybrid power supply is divided equally load system;
Fig. 3 is that the regional prepared auto restart of interchange provided by the invention and flexible direct current hybrid power supply is divided equally charging process logical schematic in load method embodiment one;
Fig. 4 is that the regional prepared auto restart of interchange provided by the invention and flexible direct current hybrid power supply is divided equally prepared auto restart course of action logical schematic in load method embodiment one;
Fig. 5 is that the regional prepared auto restart of interchange provided by the invention and flexible direct current hybrid power supply is divided equally charging process logical schematic in load method embodiment two;
Fig. 6 is that the regional prepared auto restart of interchange provided by the invention and flexible direct current hybrid power supply is divided equally prepared auto restart course of action logical schematic in load method embodiment two.
Embodiment
In to interchange transmission and distribution network transformation process, to exchange power transmission and distribution websites internal loading and turn 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 the part technological transformation, finally become a plurality of flexible direct current power transmission and distribution source points, directly extend for the website that possesses the enlarging condition simultaneously and be that flexible direct current power transmission and distribution source point, formation exchange transmission and distribution network and the flexible direct current transmission and distribution network Mixed Zone of newly building.The two branches' (110 kV/10 kV or flexible direct current) of consideration employing transformer.
The regional prepared auto restart of interchange concrete shown in Figure 2 and flexible direct current hybrid power supply is 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 the 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 flexible direct current district's contact
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
Be the converter element in oval;
QFP1 is connected with the positive direct-current bus in flexible direct current transmission and distribution network zone, and QFP2 is connected with the negative dc bus in flexible direct current transmission and distribution network zone;
In interchange shown in Figure 2 and flexible direct current hybrid power supply zone prepared auto restart is divided equally load system, transformer B2 is extended into two branches transformer (110 kV/10 kV/ flexible direct current district), low-pressure side exchanges two branches with the flexible direct current district with 10kV, its 10 kV AC branch is connected with 10 kV sides of B1 low-pressure side, the flexible direct current district side of flexible direct current district side branch and B3 is connected, and forms 10 kV and exchanges and power supply Mixed Zones, flexible direct current district.
For improving the power supply reliability of this Mixed Zone, exchange with flexible direct current zone installation backup auto-activating device at 10kV and realize.Due to the load high concentration, in Fig. 2, B1, B2, B3 all may exist apportion and overload operation, if certain transformer (as B1 or B3) action tripping operation, low-voltage bus bar side backup auto-activating device action this moment, the B2 transformer is seriously overloaded, greatly shorten the life cycle of B2 transformer, serious situation also may cause transformer insulated damage.
Exchange and flexible direct current hybrid power supply district transformer territory overload operation in order to improve 10kV, a kind of interchange provided by the invention is divided equally load system with the regional prepared auto restart of flexible direct current hybrid power supply, comprising: exchange transmission and distribution network zone and flexible direct current transmission and distribution network regional; And
10kV ac bus bridge, it is connected with the 10kV 2M bus of described interchange transmission and distribution network, is used for converging the 10KV AC energy;
Negative dc bus bridge, it is connected with the negative dc bus of described flexible direct current transmission and distribution network;
The 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 used for converging the direct current energy of described flexible direct current transmission and distribution network;
The contact reactor, it is connected with described 10kV ac bus bridge, its for the voltage source converter of described flexible direct current transmission and distribution network with exchange transmission and distribution network and carry out the quality of power supply and 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 connects and ground connection with the other end of being connected 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 zone tripping operation, divide equally load by described contact dc switch QFP1 and contact dc switch QFP2; Or
When the transformer B3 in described flexible direct current transmission and distribution network zone tripping operation, divide equally load by the 10kV 1M bus in described interchange transmission and distribution network zone and the interconnection switch FDL between 10kV 2M bus.
The invention provides to exchange with flexible direct current hybrid power supply zone prepared auto restart and divide equally load system according to different situations, can be divided into that QFP1, QFP2 divide equally load and FDL divides equally the two kinds of situations of loading.Below will be introduced respectively.
Mode 1:QFP1, QFP2 divide equally burden functional
In mode 1, the method for charging for the backup auto-activating device act on described interchange and flexible direct current hybrid power supply zone comprises:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into the position;
Whether detect the 10kV 1M bus in described interchange transmission and distribution network zone and the interconnection switch FDL between 10kV 2M bus 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 whether voltage is all arranged;
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 the input position;
Whether detect described dc contact switch QFP1 and contact dc switch QFP2 all in co-bit;
When meeting the following conditions, after the 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 the position.
2. the positive and negative dc bus in 10 kV 1M, 2M and 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 satisfying 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 starting, backup auto-activating device jumps again B1 step-down transformer step-down side switch (DL2), in time-delay t3; If receive that B1 step-down transformer step-down side switch (DL2) is a minute position signal, prepared auto restart drops into the interconnection switch FDL between 10 kV1M and 2M automatically; If receive that the FDL between 10 kV1M and 2M interconnection switch is the co-bit signal, QFP1, QFP2 interconnection switch are jumped in tripping in time-delay t4, realize that QFP1, QFP2 interconnection switch divide equally burden functional.
If showing, each the link number of collection of letters device divides equally the burden functional failure.Logic diagram as shown in Figure 4
Mode 2:FDL divides equally burden functional
In mode 2, the method for charging for the backup auto-activating device act on described interchange and flexible direct current hybrid power supply zone comprises:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into the 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 whether voltage is all arranged;
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 the position;
Whether detect described interconnection switch FDL in co-bit;
When meeting the following conditions, after the 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 the position.
2. the positive and negative dc bus in 10 kV 1M, 2M and 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 satisfying 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 starting, backup auto-activating device jumps again B3 step-down transformer step-down side switch QF1, QF2, in time-delay t3; If receive that all B3 step-down transformer step-down side switch QF1, QF2 are a minute position signal, prepared auto restart drops into QFP1, QFP2 interconnection switch automatically; If receive that QFP1, QFP2 interconnection switch are the co-bit signal, tripping 10 kV1M and 2M interconnection switch FDL in time-delay t4 realize that FDL divides equally burden functional.
If showing, each the link number of collection of letters device divides equally the burden functional failure.Logic diagram as shown in Figure 6
implement the present invention, can improve the power supply reliability of this Mixed Zone, exchanging and certain transformer in flexible direct current hybrid power supply zone, as when exchanging the transformer B3 action tripping operation in the transformer B1 of transmission and distribution network power supply area or flexible direct current transmission and distribution network zone, 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 the 10kV 1M bus that exchanges the transmission and distribution network zone 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 claim of the present invention still belongs to the scope that the present invention is contained.
Claims (5)
1. an interchange and flexible direct current hybrid power supply zone prepared auto restart is divided equally load system, it is characterized in that, comprising: exchange transmission and distribution network zone and flexible direct current transmission and distribution network regional; And
10kV ac bus bridge, it is connected with the 10kV 2M bus of described interchange transmission and distribution network, is used for converging the 10KV AC energy;
Negative dc bus bridge, it is connected with the negative dc bus of described flexible direct current transmission and distribution network;
The 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 used for converging the direct current energy of described flexible direct current transmission and distribution network;
The contact reactor, it is connected with described 10kV ac bus bridge, its for the voltage source converter of described flexible direct current transmission and distribution network with exchange transmission and distribution network and carry out the quality of power supply and 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 connects and ground connection with the other end of being connected 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 zone tripping operation, divide equally load by described contact dc switch QFP1 and contact dc switch QFP2; Or
When the transformer B3 in described flexible direct current transmission and distribution network zone tripping operation, divide equally load by the 10kV 1M bus in described interchange transmission and distribution network zone and the interconnection switch FDL between 10kV 2M bus.
2. an interchange and flexible direct current hybrid power supply zone prepared auto restart is divided equally load method, it is characterized in that, the method is specially described contact dc switch QFP1 and contact dc switch QFP2 divides equally when loading, the method of charging for the backup auto-activating device act on described interchange and flexible direct current hybrid power supply zone comprises:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into the position;
Whether detect the 10kV 1M bus in described interchange transmission and distribution network zone and the interconnection switch FDL between 10kV 2M bus 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 whether voltage is all arranged;
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 the 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 in placement position, the 10kV 1M bus in described interchange transmission and distribution network zone 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, voltage is arranged all, 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 the position; Described dc contact switch QFP1 and contact dc switch QFP2 all when co-bit, after the t1 time delays, give described backup auto-activating device charging.
3. an interchange and flexible direct current hybrid power supply zone prepared auto restart is divided equally load method, it is characterized in that, the method is specially described contact dc switch QFP1 and contact dc switch QFP2 divides equally when loading, act on the method that the backup auto-activating device in described interchange and flexible direct current hybrid power supply zone carries out the 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 when 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; While is the described transformer B1 of tripping step-down side switch DL2 again;
At time-delay t3 in the time, if receive that transformer B1 step-down side switch DL2 is a minute position signal, prepared auto restart drops into the 10kV 1M bus in described interchange transmission and distribution network zone and the interconnection switch FDL between 10kV 2M bus simultaneously automatically;
If receive that described interconnection switch FDL is the co-bit signal, the time-delay t4 time, the described contact dc switch of tripping QFP1 and contact dc switch QFP2 realize that contact dc switch QFP1, contact dc switch QFP2 divide equally burden functional.
4. an interchange and flexible direct current hybrid power supply zone prepared auto restart is divided equally load method, it is characterized in that, the method is specially the 10kV 1M bus in described interchange transmission and distribution network zone and the interconnection switch FDL between 10kV 2M bus when dividing equally load, the method of charging for the backup auto-activating device act on described interchange and flexible direct current hybrid power supply zone comprises:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into the 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 whether voltage is all arranged;
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 the 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 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, voltage is arranged all, 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 the position; Described interconnection switch FDL after the t1 time delays, gives described backup auto-activating device charging when co-bit.
5. an interchange and flexible direct current hybrid power supply zone prepared auto restart is divided 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 zone 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 zone carries out the 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 the positive direct-current bus that transformer B3 low-pressure side detected and negative dc bus decompression, 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; While is the described transformer B3 of tripping step-down side switch QF1, QF2 again;
In time, if receive that transformer B3 step-down side switch QF1, QF2 are a minute position signal, prepared auto restart drops into described dc contact switch QFP1 and dc contact switch QFP2 simultaneously automatically at time-delay t3;
If receive that described dc contact switch QFP1 and dc contact switch QFP2 are the co-bit signal, the time-delay t4 time, the 10kV 1M bus in the described interchange transmission and distribution network of tripping zone and the interconnection switch FDL between 10kV 2M bus realize that interconnection switch FDL divides equally burden functional.
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| CN201310094012.0A CN103138295B (en) | 2013-03-22 | 2013-03-22 | System and method for averaging load of backup automatic switch in alternating current and soft direct current hybrid power supply area |
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| CN201310094012.0A CN103138295B (en) | 2013-03-22 | 2013-03-22 | System and method for averaging load of backup automatic switch in alternating current and soft direct current hybrid power supply area |
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| CN107492947A (en) * | 2017-07-26 | 2017-12-19 | 国网山东省电力公司日照供电公司 | A kind of dual transformer control method and system |
| CN113632335A (en) * | 2019-03-27 | 2021-11-09 | Abb电网瑞士股份公司 | Transformer isolation response using DC link |
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| WO2010013783A1 (en) * | 2008-08-01 | 2010-02-04 | パナソニック電工株式会社 | Power distribution system |
| CN202772656U (en) * | 2012-07-11 | 2013-03-06 | 北京国能子金电气技术有限公司 | Standby power supply online device |
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| WO2010013783A1 (en) * | 2008-08-01 | 2010-02-04 | パナソニック電工株式会社 | Power distribution system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107492947A (en) * | 2017-07-26 | 2017-12-19 | 国网山东省电力公司日照供电公司 | A kind of dual transformer control method and system |
| CN113632335A (en) * | 2019-03-27 | 2021-11-09 | Abb电网瑞士股份公司 | Transformer isolation response using DC link |
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| CN103138295B (en) | 2014-12-10 |
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