CN103138384A - Spare power automatic switching configuration system and method for alternating current and flexible direct current hybrid power supply area - Google Patents
Spare power automatic switching configuration 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 spare power automatic switching configuration system and a method for an alternating current and flexible direct current hybrid power supply area, which comprises the following steps: 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; one end of a connecting direct current capacitor CP1 is connected with the turn-off device VTP1, one end of a connecting direct current capacitor CP2 is connected with the turn-off device VTP2, and the other ends of the connecting direct current capacitor CP1 and the connecting direct current capacitor CP2 are connected and grounded; and the connecting direct current switch QFP1 and the connecting direct current switch QFP2 are respectively connected with the positive direct current bus bridge and the negative direct current bus bridge and play a role in isolation when in fault. The invention can better avoid the AC power transmission and distribution network region and the flexible DC power transmission and distribution network region from becoming islands during the hybrid power supply of the AC power transmission and distribution network and the flexible DC power transmission and distribution network, and solves the interconnection problem of the two power network regions.
Description
Technical field
The present invention relates to exchange and flexible direct current transmission and distribution network prepared auto restart configuring technical field, relate in particular to a kind of prepared auto restart configuration-system and method of alternating current-direct current hybrid power supply regional distribution network.
Background technology
At present, the most of town and country of China distribution network system adopts 10 kV alternating currents as main supply power voltage.Due to economic in recent years fast development, the problems such as power supply capacity deficiency, website and circuit corridor resource be very nervous 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, transmission and distribution network zone, not all power supply area all possesses condition and the opportunity of boosting at once, certainly exist the zone that the power distribution network of two kinds of heterogeneity grades coexists, also namely exchange the transmission and distribution network zone and the zone hybrid power supply of flexible direct current power distribution network is regional.Specifically as shown in Figure 1.
During adopt exchanging the regional hybrid power supply of transmission and distribution network zone and flexible direct current power distribution network, ac transmission distribution district and flexible direct current power distribution network zone become isolated island, solve two kinds of Grid interconnect problem.
Summary of the invention
A kind of prepared auto restart configuration-system that exchanges with flexible direct current hybrid power supply zone provided by the invention comprises:
10kV ac bus bridge, it is connected with the 10kV 1M 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.
The present invention also provides a kind of interchange and flexible direct current hybrid power supply zone spare power automatic switching method, and the method is specially the method that the backup auto-activating device that acts on aforementioned interchange and flexible direct current hybrid power supply zone charges, and comprises;
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into the position;
Whether detect the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network and described positive direct-current bus in a minute position, and be not inspecting state;
Detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network and described flexible direct current 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;
when the prepared auto restart function pressing plate that described backup auto-activating device detected in placement position, the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network and described positive direct-current bus is all in a minute position, and be not maintenance, on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative dc bus, voltage is arranged all, the transformer B1 main transformer low-side switch DL2 of described interchange transmission and distribution network is when co-bit, after the 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 zone spare power automatic switching method, and the method is specially the method that the backup auto-activating device that acts on aforementioned interchange and flexible direct current hybrid power supply zone charges, and comprises;
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into the position;
Whether detect the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network and described positive direct-current bus in a minute position, and be not inspecting state;
Detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network and described flexible direct current transmission and distribution network and negative dc bus whether voltage is all arranged;
Whether the transformer B2 main transformer low-pressure side dc switch QF1 of detection flexible direct current transmission and distribution network and dc switch QF2 be in co-bit;
when the prepared auto restart function pressing plate that described backup auto-activating device detected in placement position, the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network and described positive direct-current bus is all in a minute position, and be not maintenance, on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative dc bus, voltage is arranged all, the transformer B2 main transformer low-pressure side dc switch QF1 of described flexible direct current transmission and distribution network and dc switch QF2 are in co-bit, after the 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 zone spare power automatic switching method, and the method is specially the method that the backup auto-activating device that acts on aforementioned interchange and flexible direct current hybrid power supply zone discharges, and comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device is withdrawing from the position;
Whether detect the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network or described positive direct-current bus in co-bit, or be inspecting state;
Whether detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network, described flexible direct current transmission and distribution network, negative dc bus no-voltage;
Detect the hand of whether receiving the transformer B1 main transformer high side switch DL1 that exchanges transmission and distribution network and jump signal;
Detect the hand of whether receiving the transformer B1 main transformer low-side switch DL2 that exchanges transmission and distribution network and jump signal;
Detect the main transformer backup protection signal of whether receiving transformer B1;
when the prepared auto restart function pressing plate that described backup auto-activating device detected is withdrawing from the position, or the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network or described positive direct-current bus detected in co-bit or in maintenance, or detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network or described flexible direct current transmission and distribution network and negative dc bus all no-voltages, or the transformer B1 main transformer high side switch DL1 hand of the receiving described interchange transmission and distribution network hand of jumping signal or receiving transformer B1 main transformer low-side switch DL2 is when jumping signal, or when receiving transformer B1 main transformer backup protection signal, after the t2 time delays, described backup auto-activating device discharge.
The present invention also provides a kind of interchange and flexible direct current hybrid power supply zone spare power automatic switching method, and the method is specially the method that the backup auto-activating device that acts on aforementioned interchange and flexible direct current hybrid power supply zone discharges, and comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device is withdrawing from the position;
Whether detect the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network or described positive direct-current bus in co-bit, or be inspecting state;
Whether detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network, described flexible direct current transmission and distribution network, negative dc bus no-voltage;
Detect the hand of the transformer B2 main transformer high-pressure side dc switch DL3 that whether receives the flexible direct current transmission and distribution network and jump signal;
Whether detection receives the transformer B2 main transformer low-pressure side dc contact switch QFP1 of flexible direct current transmission and distribution network or the hand jumping signal of QFP2;
Detect the main transformer backup protection signal of whether receiving transformer B2;
when the prepared auto restart function pressing plate that described backup auto-activating device detected is withdrawing from the position, or the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network or described positive direct-current bus detected in co-bit or in maintenance, or detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network or described flexible direct current transmission and distribution network and negative dc bus all no-voltages, or the transformer B2 main transformer high side switch DL3 hand of the receiving described flexible direct current transmission and distribution network hand of jumping signal or receiving transformer B2 main transformer low-pressure side dc contact switch QFP1 or QFP2 is when jumping signal, or when receiving transformer B2 main transformer backup protection signal, after the t2 time delays, described backup auto-activating device discharge.
The present invention also provides a kind of interchange and flexible direct current hybrid power supply regional spare power automatic switching method, and this spare power automatic switching method is specially the method for operating of the backup auto-activating device that acts on aforesaid interchange and the regional prepared auto restart configuration-system of flexible direct current hybrid power supply, comprising:
Whether the 10 kV 1M buses that detect described interchange transmission and distribution network decompression;
Whether detect original load capacity P1 on 10 kV 1M buses of described interchange transmission and distribution network less than the negative dc bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus;
Whether the transformer B1 step-down side that detects described interchange transmission and distribution network no current;
When the 10 kV 1M bus loss of pressure that described interchange transmission and distribution network detected, and original load capacity P1 on 10 kV 1M buses of described interchange transmission and distribution network detected less than the negative dc bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus, and when the transformer B1 step-down side no current of described interchange transmission and distribution network being detected, the time-delay t3 time, the while is the described transformer B1 of tripping step-down side switch DL2 again;
In time-delay t4, if receive that transformer B1 step-down side switch DL2 is a minute position signal, prepared auto restart drops into QFP1 and QFP2 interconnection switch simultaneously automatically, and backup auto-activating device shows to be hauled oneself willingly into successfully;
If in time-delay t4, do not receive that transformer B1 step-down side switch DL2 is a minute position signal, backup auto-activating device shows hauls oneself willingly into failure.
The present invention also provides a kind of interchange and flexible direct current hybrid power supply regional spare power automatic switching method, and this spare power automatic switching method is specially the method for operating of the backup auto-activating device that acts on aforesaid interchange and the regional prepared auto restart configuration-system of flexible direct current hybrid power supply, comprising:
Detect whether decompression of the positive direct-current bus of described flexible direct current transmission and distribution network and negative dc bus;
Whether detect original load capacity P1 on 10 kV 1M buses of described interchange transmission and distribution network greater than the negative dc bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus;
Whether the transformer B2 step-down side that detects described flexible direct current transmission and distribution network no current;
When the positive direct-current bus that described flexible direct current transmission and distribution network detected and negative dc bus decompression, and original load capacity P1 on 10 kV 1M buses of described interchange transmission and distribution network detected greater than the negative dc bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus, and when the transformer B2 step-down side no current of described flexible direct current transmission and distribution network being detected, the time-delay t3 time, backup auto-activating device starts; While is the described transformer B2 of tripping step-down side dc contact switch QFP1 and dc contact switch QFP2 again;
In time-delay t4, if receive that transformer B2 step-down side dc contact switch QFP1 and dc contact switch QFP2 are a minute position signal, the interconnection switch QFP1 of the 10kV 1M bus of automatic input interchange of prepared auto restart while transmission and distribution network and the positive direct-current bus of flexible direct current transmission and distribution network and the interconnection switch QFP2 of negative dc bus, backup auto-activating device shows to be hauled oneself willingly into successfully;
If in time-delay t4, do not receive that transformer B2 step-down side dc contact switch QFP1 and dc contact switch QFP2 are a minute position signal, backup auto-activating device shows hauls oneself willingly into failure.
The present invention proposes that a kind of prepared auto restart configuration-system of alternating current-direct current hybrid power supply regional distribution network and method can be better avoid exchanging the transmission and distribution network zone during exchanging transmission and distribution network and the hybrid power supply of flexible direct current transmission and distribution network and flexible direct current power distribution network zone becomes isolated island, the interconnect problem of two kinds of Grids.
Description of drawings
Fig. 1 is for exchanging transmission and distribution network zone and flexible direct current power distribution network zone hybrid power supply area schematic;
Fig. 2 is the structural representation of the prepared auto restart configuration-system in interchange provided by the invention and flexible direct current hybrid power supply zone;
Fig. 3 is converter valve operation principle flow path schematic diagram in the prepared auto restart configuration-system in interchange provided by the invention and flexible direct current hybrid power supply zone;
Fig. 4 is charging process logical schematic in the spare power automatic switching method embodiment one in interchange provided by the invention and flexible direct current hybrid power supply zone;
Fig. 5 is discharge process logical schematic in the spare power automatic switching method embodiment one in interchange provided by the invention and flexible direct current hybrid power supply zone;
Fig. 6 is prepared auto restart process logic schematic diagram in the spare power automatic switching method embodiment one in interchange provided by the invention and flexible direct current hybrid power supply zone;
Fig. 7 is charging process logical schematic in the spare power automatic switching method embodiment two in interchange provided by the invention and flexible direct current hybrid power supply zone;
Fig. 8 is discharge process logical schematic in the spare power automatic switching method embodiment two in interchange provided by the invention and flexible direct current hybrid power supply zone;
Fig. 9 is prepared auto restart process logic schematic diagram in the spare power automatic switching method embodiment two in interchange provided by the invention and flexible direct current hybrid power supply zone.
Embodiment
The embodiment of the present invention proposes a kind of prepared auto restart configuration-system and method of alternating current-direct current hybrid power supply regional distribution network.For better becoming isolated island, the interconnect problem of two kinds of Grids of solution for fear of exchanging transmission and distribution network zone and flexible direct current power distribution network zone during hybrid power supply.
Fig. 2 is the structural representation of the prepared auto restart configuration-system in interchange provided by the invention and flexible direct current hybrid power supply zone.
As shown in Figure 2, the prepared auto restart configuration-system that exchanges with flexible direct current hybrid power supply zone comprises:
10kV ac bus bridge, it is connected with the 10kV 1M 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;
Contact reactor LP, 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; Play simultaneously filter action.
Contact converter valve brachium pontis, it is connected with described contact reactor, takes three-phase (A, B, C) two level bridge architectures, comprises turn-off device VTP1, turn-off device VTP2, fly-wheel diode VDP1 and VDP2;
Concrete, as shown in Figure 3, contact converter valve brachium pontis operation principle following (take A mutually as example):
Upper and lower two disconnected device valves of contact converter valve brachium pontis have four kinds of different current paths, as shown in 3.When the broken device element VTP1 of first brachium pontis triggers, if electric current for just, circulation path from the capacitance cathode end through turn-off device VTP1 to output, middle a path as shown in Figure 3; If electric current is for negative, circulation path from output through fly-wheel diode VDP1 to the capacitance cathode end, as shown in 3 in the b path.When the broken device VTP2 of half brachium pontis triggers instantly, if electric current for just, circulation path from electric capacity negative polarity end through fly-wheel diode VDP2 to output, middle d path as shown in Figure 3; If electric current is for negative, circulation path from output through turn-off device VTa2 to electric capacity negative polarity end, as shown in Figure 3 in the c path.B, C phase and A are similar, repeat no more.
Contact dc capacitor CP1 one end is connected with described turn-off device VTP1, and contact dc capacitor CP2 one end is connected with described turn-off device VTP2, and contact dc capacitor CP1 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;
Earth point d is drawn in the normally bipolar operation of flexible electrical power trans mission/distribution system of contact dc terminal in the middle of two group capacitor CP1, the CP2 of symmetry, earth point d keeps dc terminal the two poles of the earth balance, the direct current equal and opposite in direction of the upper and lower utmost point when normally moving, opposite direction.
Contact dc switch QFP1 and contact dc switch QFP2 connect with described positive direct-current bus bridge and negative dc bus bridging respectively, play buffer action when fault.
The below acts on introduction the spare power automatic switching method of the backup auto-activating device of above-mentioned interchange and flexible direct current transmission and distribution network prepared auto restart configuration-system.
At first need to prove, so-called backup auto-activating device in the present invention, refer to that stand-by power supply drops into operative installations automatically, be called for short backup auto-activating device, it act as: in the situation that working power sudden failure or abnormal, automatic put-in spair power source, the electricity consumption that recovers rapidly decompression equipment guarantees the continuity of powering.
So-called spare power automatic switching method in the present invention is backup auto-activating device and charges, the method for operating such as discharge and input.
Exchange and the adaptability of the regional prepared auto restart of flexible direct current hybrid power supply to operational mode in order to improve, prepared auto restart charging, discharge, method of operating can be divided into mode 1 and mode 2, below will describe respectively.
The charging process of mode 1 as shown in Figure 4.
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into the position;
Whether detect the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network and described positive direct-current bus in a minute position, and be not inspecting state;
Detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network and described flexible direct current 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;
Concrete charging process is as follows:
1. " prepared auto restart function pressing plate " detected and drop into the position.
2. interchange and flexible direct current interconnection switch (QFP1, QFP2) detected all in " minute position ", and for overhauling.
3. 10 kV1M detected and positive and negative dc bus all has voltage.
4. B1 main transformer low-side switch DL2 detected in co-bit.
Satisfy above-mentioned condition and be in charged state after the t1 time delays
The concrete charging process of described mode 1 realizes, " prepared auto restart function pressing plate " all has voltage, (DL2) to be in co-bit, QFP1, QFP2 all in " minute position " dropping into position, 10kV 1M and positive and negative dc bus, and do not consist of altogether and door () for maintenance etc., through charging successfully after the t1 time delays.
Accordingly, discharge process is as follows, at first carries out following detection:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device is withdrawing from the position;
Whether detect the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network or described positive direct-current bus in co-bit, or be inspecting state;
Whether detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network, described flexible direct current transmission and distribution network, negative dc bus no-voltage;
Detect the hand of whether receiving the transformer B1 main transformer high side switch DL1 that exchanges transmission and distribution network and jump signal;
Detect the hand of whether receiving the transformer B1 main transformer low-side switch DL2 that exchanges transmission and distribution network and jump signal;
Detect the main transformer backup protection signal of whether receiving transformer B1;
Possess the discharge of one of following condition, logic diagram as shown in Figure 5
1. " prepared auto restart function pressing plate " withdrawing from the position
2. QFP1 or QFP2 interconnection switch are all in " co-bit " or maintenance
3. 10 kV1M with no pressures, time-delay 5s discharge (sending out simultaneously alarm signal)
4. positive direct-current bus with no pressure, time-delay 5s discharge (sending out simultaneously alarm signal)
5. bear the dc bus with no pressure, time-delay 5s discharge (sending out simultaneously alarm signal)
6. receive that B1 uprises switch DL1 hand and jumps signal
7. receive B1 step-down switch DL2 hand jumping signal
8. receive B1 main transformer backup protection signal
The concrete discharge process of described mode 1 is achieved as follows:
" prepared auto restart function pressing plate " withdraw from position, 10 kV1M or the equal with no pressure of positive and negative dc bus, QFP1 or QFP2 interconnection switch all in " co-bit " or maintenance, receive that B1 uprises switch DL1 hand and jumps signal; Receive B1 step-down switch DL2 hand jumping signal; Receive formation or the doors (＞=) such as B1 main transformer backup protection signal, through charging successfully after the t2 time delays.
Accordingly, the backup auto-activating device process of moving is as follows:
1. 10 kV 1M decompressions detected.
2. P1＜P2(P1 is original load capacity on 10 kV 1M; P2 is the DC side load capacity)
3. B1 step-down transformer step-down side is without stream (can adjust by no flow setpoint)
Satisfying above-mentioned condition time-delay t3 device starts; Jump simultaneously B1 step-down transformer step-down side switch (DL2), in time-delay t4, if receive that B1 step-down transformer step-down side switch (DL2) is a minute position signal, prepared auto restart drops into QFP1 and QFP2 interconnection switch simultaneously automatically again, and device shows to be hauled oneself willingly into successfully; If in time-delay t4, do not receive that B1 step-down transformer step-down side switch (DL2) is a minute position signal, device shows hauls oneself willingly into failure.Logic diagram as shown in Figure 6.
The concrete course of action of described mode 1 is realized, 10 kV 1M decompressions detected; P1＜P2(P1 is original load capacity on 10 kV 1M; P2 for preparing the prepared auto restart load capacity, is exactly to prepare the load capacity of input from DC side); B1 step-down transformer step-down side consists of without stream (can adjust by no flow setpoint) and door (﹠) device starts, through jumping DL2 after the t3 time delays, device receives that DL2 and time-delay t4 consist of and door (), and prepared auto restart drops into QFP1 and QFP2 interconnection switch simultaneously automatically.
The charging process of mode 2 as shown in Figure 7.
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into the position;
Whether detect the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network and described positive direct-current bus in a minute position, and be not inspecting state;
Detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network and described flexible direct current transmission and distribution network and negative dc bus whether voltage is all arranged;
Whether the transformer B2 main transformer low-pressure side dc switch QF1 of detection flexible direct current transmission and distribution network and dc switch QF2 be in co-bit;
Charging process:
1. " prepared auto restart function pressing plate " drops into the position.
2. exchange with flexible direct current interconnection switch (QFP1, QFP2) all in " minute position ", and be not maintenance.
3. 10 kV 1M and positive and negative dc bus all have voltage.
4. B2 main transformer low-pressure side dc switch (QFP1, QFP2) is all in co-bit.
Satisfy above-mentioned condition and be in charged state after the t1 time delays.
The concrete charging process of described mode 2 is achieved as follows:
" prepared auto restart function pressing plate " all has voltage, QFP1, QFP2 all in " minute position " dropping into position, 10 kV1M and positive and negative dc bus, and be not that maintenance, QF1 and QF2 are all in co-bit, and do not consist of altogether and door () for maintenance etc., through charging successfully after the t1 time delays.
The discharge process of mode 2 is as follows:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device is withdrawing from the position;
Whether detect the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network or described positive direct-current bus in co-bit, or be inspecting state;
Whether detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network, described flexible direct current transmission and distribution network, negative dc bus no-voltage;
Detect the hand of the transformer B2 main transformer high-pressure side dc switch DL3 that whether receives the flexible direct current transmission and distribution network and jump signal;
Whether detection receives the transformer B2 main transformer low-pressure side dc contact switch QFP1 of flexible direct current transmission and distribution network or the hand jumping signal of QFP2;
Detect the main transformer backup protection signal of whether receiving transformer B2;
Possesses the discharge of one of following condition.Logic diagram as shown in Figure 8
1. " prepared auto restart function pressing plate " withdrawing from the position
2. 10 kV1M and positive and negative dc bus interconnection switch QFP1 or QFP2 be all in " co-bit ", and be maintenance
3. 10 kV1M with no pressures, time-delay 5s discharge (sending out simultaneously alarm signal)
4. positive direct-current bus with no pressure, time-delay 5s discharge (sending out simultaneously alarm signal)
5. bear the dc bus with no pressure, time-delay 5s discharge (sending out simultaneously alarm signal)
6. receive that B2 uprises switch DL3 hand and jumps signal
7. receive B2 step-down switch QFP1 or QFP2 hand jumping signal
8. receive B2 main transformer backup protection signal
The concrete discharge process of described mode 2 is achieved as follows:
" prepared auto restart function pressing plate " withdrawing from position, 10 kV1M and positive and negative dc bus interconnection switch QFP1 or QFP2 all in " co-bit ", and for maintenance, 10 kV1M or positive and negative dc bus with no pressure, receive that B2 uprises switch DL1 hand and jumps signal; Receive B2 step-down switch QF1 or QF2 hand jumping signal; Receive formation or the doors (＞=) such as B2 main transformer backup protection signal, through charging successfully after the t2 time delays.
The action logic figure of mode 2 as shown in Figure 9, its process is as follows:
Detect whether decompression of the positive direct-current bus of described flexible direct current transmission and distribution network and negative dc bus;
Whether detect original load capacity P1 on 10 kV 1M buses of described interchange transmission and distribution network greater than the negative dc bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus;
Whether the transformer B2 step-down side that detects described flexible direct current transmission and distribution network no current;
1. the equal decompression of positive and negative dc bus detected simultaneously.
2. P1＞P2(P1 is original load capacity on 10 kV 1M; P2 is the DC side load capacity)
3. B2 step-down transformer step-down side is without stream (can adjust by no flow setpoint)
Satisfying above-mentioned condition time-delay t3 device starts; Jump again simultaneously B2 step-down dc switch QF1 and QF2, in time-delay t4, if receive that receiving simultaneously jumping B2 step-down dc switch QF1 and QF2 is a minute position signal, prepared auto restart drops into 10 kV1M and positive and negative dc bus interconnection switch QFP1 or QFP2 automatically simultaneously, and device shows to be hauled oneself willingly into successfully; If in time-delay t4, do not receive 10 kV1M and positive and negative dc bus interconnection switch QFP1 or QFP2, device shows hauls oneself willingly into failure.
The embodiment of the present invention proposes a kind of prepared auto restart configuration-system and method of alternating current-direct current hybrid power supply regional distribution network, can be during hybrid power supply become isolated island, the interconnect problem of two kinds of Grids of solution for fear of exchanging transmission and distribution network zone and flexible direct current power distribution network zone.
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 (7)
1. the prepared auto restart configuration-system in an interchange and flexible direct current hybrid power supply zone, is characterized in that, comprising:
10kV ac bus bridge, it is connected with the 10kV 1M 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.
2. an interchange and flexible direct current hybrid power supply zone spare power automatic switching method, is characterized in that, the method is specially the method that the backup auto-activating device that acts on the described interchange of claim 1 and flexible direct current hybrid power supply zone charges, and comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into the position;
Whether detect the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network and described positive direct-current bus in a minute position, and be not inspecting state;
Detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network and described flexible direct current 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;
when the prepared auto restart function pressing plate that described backup auto-activating device detected in placement position, the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network and described positive direct-current bus is all in a minute position, and be not maintenance, on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative dc bus, voltage is arranged all, the transformer B1 main transformer low-side switch DL2 of described interchange transmission and distribution network is 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 spare power automatic switching method, is characterized in that, the method is specially the method that the backup auto-activating device that acts on the described interchange of claim 1 and flexible direct current hybrid power supply zone charges, and comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device drops into the position;
Whether detect the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network and described positive direct-current bus in a minute position, and be not inspecting state;
Detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network and described flexible direct current transmission and distribution network and negative dc bus whether voltage is all arranged;
Whether the transformer B2 main transformer low-pressure side dc switch QF1 of detection flexible direct current transmission and distribution network and dc switch QF2 be in co-bit;
when the prepared auto restart function pressing plate that described backup auto-activating device detected in placement position, the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network and described positive direct-current bus is all in a minute position, and be not maintenance, on the 10kV 1M bus of described interchange transmission and distribution network and the positive direct-current bus of described flexible direct current transmission and distribution network and negative dc bus, voltage is arranged all, the transformer B2 main transformer low-pressure side dc switch QF1 of described flexible direct current transmission and distribution network and dc switch QF2 are in co-bit, after the t1 time delays, give described backup auto-activating device charging.
4. an interchange and flexible direct current hybrid power supply zone spare power automatic switching method, is characterized in that, the method is specially the method that the backup auto-activating device that acts on the described interchange of claim 1 and flexible direct current hybrid power supply zone discharges, and comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device is withdrawing from the position;
Whether detect the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network or described positive direct-current bus in co-bit, or be inspecting state;
Whether detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network, described flexible direct current transmission and distribution network, negative dc bus no-voltage;
Detect the hand of whether receiving the transformer B1 main transformer high side switch DL1 that exchanges transmission and distribution network and jump signal;
Detect the hand of whether receiving the transformer B1 main transformer low-side switch DL2 that exchanges transmission and distribution network and jump signal;
Detect the main transformer backup protection signal of whether receiving transformer B1;
when the prepared auto restart function pressing plate that described backup auto-activating device detected is withdrawing from the position, or the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network or described positive direct-current bus detected in co-bit or in maintenance, or detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network or described flexible direct current transmission and distribution network and negative dc bus all no-voltages, or the transformer B1 main transformer high side switch DL1 hand of the receiving described interchange transmission and distribution network hand of jumping signal or receiving transformer B1 main transformer low-side switch DL2 is when jumping signal, or when receiving transformer B1 main transformer backup protection signal, after the t2 time delays, described backup auto-activating device discharge.
5. an interchange and flexible direct current hybrid power supply zone spare power automatic switching method, is characterized in that, the method is specially the method that the backup auto-activating device that acts on the described interchange of claim 1 and flexible direct current hybrid power supply zone discharges, and comprising:
Whether the prepared auto restart function pressing plate that detects described backup auto-activating device is withdrawing from the position;
Whether detect the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network or described positive direct-current bus in co-bit, or be inspecting state;
Whether detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network, described flexible direct current transmission and distribution network, negative dc bus no-voltage;
Detect the hand of the transformer B2 main transformer high-pressure side dc switch DL3 that whether receives the flexible direct current transmission and distribution network and jump signal;
Whether detection receives the transformer B2 main transformer low-pressure side dc contact switch QFP1 of flexible direct current transmission and distribution network or the hand jumping signal of QFP2;
Detect the main transformer backup protection signal of whether receiving transformer B2;
when the prepared auto restart function pressing plate that described backup auto-activating device detected is withdrawing from the position, or the dc contact switch QFP2 that connects on the dc contact switch QFP1 that connects on the negative dc bus of described flexible direct current transmission and distribution network or described positive direct-current bus detected in co-bit or in maintenance, or detect on the positive direct-current bus of the 10kV 1M bus of described interchange transmission and distribution network or described flexible direct current transmission and distribution network and negative dc bus all no-voltages, or the transformer B2 main transformer high side switch DL3 hand of the receiving described flexible direct current transmission and distribution network hand of jumping signal or receiving transformer B2 main transformer low-pressure side dc contact switch QFP1 or QFP2 is when jumping signal, or when receiving transformer B2 main transformer backup protection signal, after the t2 time delays, described backup auto-activating device discharge.
6. an interchange and flexible direct current hybrid power supply zone spare power automatic switching method, it is characterized in that, this spare power automatic switching method is specially the method for operating of the backup auto-activating device that acts on interchange claimed in claim 1 and the regional prepared auto restart configuration-system of flexible direct current hybrid power supply, comprising:
Whether the 10 kV 1M buses that detect described interchange transmission and distribution network decompression;
Whether detect original load capacity P1 on 10 kV 1M buses of described interchange transmission and distribution network less than the negative dc bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus;
Whether the transformer B1 step-down side that detects described interchange transmission and distribution network no current;
When the 10 kV 1M bus loss of pressure that described interchange transmission and distribution network detected, and original load capacity P1 on 10 kV 1M buses of described interchange transmission and distribution network detected less than the negative dc bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus, and when the transformer B1 step-down side no current of described interchange transmission and distribution network being detected, the time-delay t3 time, the while is the described transformer B1 of tripping step-down side switch DL2 again;
In time-delay t4, if receive that transformer B1 step-down side switch DL2 is a minute position signal, prepared auto restart drops into dc contact switch QFP1 and dc contact switch QFP2 simultaneously automatically, and backup auto-activating device shows to be hauled oneself willingly into successfully;
If in time-delay t4, do not receive that transformer B1 step-down side switch DL2 is a minute position signal, backup auto-activating device shows hauls oneself willingly into failure.
7. an interchange and flexible direct current hybrid power supply zone spare power automatic switching method, it is characterized in that, this spare power automatic switching method is specially the method for operating of the backup auto-activating device that acts on interchange claimed in claim 1 and the regional prepared auto restart configuration-system of flexible direct current hybrid power supply, comprising:
Detect whether decompression of the positive direct-current bus of described flexible direct current transmission and distribution network and negative dc bus;
Whether detect original load capacity P1 on 10 kV 1M buses of described interchange transmission and distribution network greater than the negative dc bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus;
Whether the transformer B2 step-down side that detects described flexible direct current transmission and distribution network no current;
When the positive direct-current bus that described flexible direct current transmission and distribution network detected and negative dc bus decompression, and original load capacity P1 on 10 kV 1M buses of described interchange transmission and distribution network detected greater than the negative dc bus of described flexible direct current transmission and distribution network and the load capacity P2 of positive direct-current bus, and when the transformer B2 step-down side no current of described flexible direct current transmission and distribution network being detected, the time-delay t3 time, backup auto-activating device starts; While is the described transformer B2 of tripping step-down side dc contact switch QFP1 and dc contact switch QFP2 again;
In time-delay t4, if receive that transformer B2 step-down side dc contact switch QFP1 and dc contact switch QFP2 are a minute position signal, the interconnection switch QFP1 of the 10kV 1M bus of automatic input interchange of prepared auto restart while transmission and distribution network and the positive direct-current bus of flexible direct current transmission and distribution network and the interconnection switch QFP2 of negative dc bus, backup auto-activating device shows to be hauled oneself willingly into successfully;
If in time-delay t4, do not receive that transformer B2 step-down side dc contact switch QFP1 and dc contact switch QFP2 are a minute position signal, backup auto-activating device shows hauls oneself willingly into failure.
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