CN103715643B - A kind of container type DC deicing system and control method - Google Patents
A kind of container type DC deicing system and control method Download PDFInfo
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- CN103715643B CN103715643B CN201310741404.1A CN201310741404A CN103715643B CN 103715643 B CN103715643 B CN 103715643B CN 201310741404 A CN201310741404 A CN 201310741404A CN 103715643 B CN103715643 B CN 103715643B
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Abstract
A kind of container type DC deicing system and control method, described direct current ice melting system major loop topology uses three-phase chain structure, often it is made up of the brachium pontis reactor of upper and lower two brachium pontis and correspondence, each brachium pontis is made up of N number of full bridge power block coupled in series, the common connecting point that on three-phase, the head end of brachium pontis is connected is as the positive pole of dc bus, and the common connecting point that under three-phase, the tail end of brachium pontis is connected is as dc bus negative pole；Described direct current ice melting system is installed in container, is divided into two power casees, a switch back brake case by function, and structure divides clear, it is simple to transport, during operation, required grid switching operation is simple.A kind of container type DC deicing system of the present invention has reactive-load compensation, DC ice melting function concurrently, it is installed in container, it is readily transported, functional structure divides clear, run required back brake switch few, use the control method of points of common connection potential shift can realize zero continuously adjustabe of VD.
Description
Technical field
The invention belongs to electronic power convertor technical field, be specifically related to a kind of container type DC deicing system and control
Method processed.
Background technology
In recent years south China area frost sleet disaster takes place frequently, and in electrical network, transmission line of electricity large area icing, causes power transmission network
Middle appearance breaks in a large number, fall tower, causes large-area power outage, also makes fast quick-recovery power transmission become extremely difficult.From
After southern ice damages in 2008, numerous studies have been done in the ice-melt of transmission line of electricity by China's power industry, and in succession develop based on not
Control rectifier bridge, DC de-icing device based on SVC, and achieve certain effect.Wherein DC de-icing device based on SVC is put down
Time be operable with Reactive Compensation Mode, when needing can by switch switching transfer major loop topology to DC ice melting state, can
The utilization rate of raising equipment, has obtained relatively broad application.
But also occur in that some problems, such as DC de-icing device harmonic wave based on SVC while using said apparatus
Seriously polluted, need to be equipped with corresponding Harmonics elimination equipment；Device volume is big, installs complexity, and during topology switching, back brake is complicated, needs
Could realize through the switching of multiple switches.During especially as wheeled apparatus, though container mode can be used to install, but
Container, rectifier transformer are bulky, transport extremely inconvenience, do not possess what portable due installation simply, quickly put into operation
Feature.
Along with the development of Power Electronic Technique, introduce wholly-controled device and generally exist to solve Thyristor Controlled commutator
Harmonic problem.But in chain structure, total module DC voltage each suspends, and does not has public dc bus, thus cannot be straight
Connect in the middle of DC ice melting, currently also there is not yet the document report of related art scheme.Additionally, it is also proposed that by light-duty directly
Half-bridge moduleization many level (HBMMC) scheme of stream transmission of electricity (HVDC Light) carries out DC ice melting, and HVDC Light has public affairs
Common DC bus, possesses the condition of high direct voltage output natively, and its AC connects electrical network simultaneously, also possesses dynamic reactive and mends
Repay ability.But, utilize HVDC Light technology ice-melt to there is also some limitation, the most prominent is exactly that HBMMC is defeated
The adjustable extent going out DC voltage is little, it is necessary in the DC voltage meeting controlled rectification condition regulation carried out above, it is impossible to effectively
Adapt to the transmission line of electricity of different length, thus the availability of device will be had a greatly reduced quality.
Summary of the invention
The present invention is directed to the deficiency of existing DC de-icing device, propose DC de-icing device and the control of a kind of container-type
Method processed, this ice melting system major loop uses modularization multi-level converter based on full-bridge modules, the public affairs of three-phase upper and lower bridge arm
Junction point draws the both positive and negative polarity as common DC bus altogether, and this device can realize zero pressure regulation, and exportable higher direct current
Voltage is to realize the ice-melt to different circuits.
The present invention specifically uses below scheme:
A kind of container type DC deicing system, it is characterised in that:
Described a kind of container type DC deicing system includes power section, back brake part；
Described a kind of container type DC deicing system uses container mode to install, and power section is installed on two packagings
Case, switch back brake are partly installed in a container；
Described a kind of container type DC deicing system use by function divide structure arranging method, described power case with
Switch back brake box function is relatively independent, is connected by cable, without connecting line between two power casees between power case with switch back brake case；
Described power section uses three-phase chain structure, Y-connection, respectively by one go up brachium pontis and a lower brachium pontis and
Corresponding brachium pontis reactor composition, each brachium pontis is made up of N number of full bridge power block coupled in series, and wherein N is the integer more than 1；Three-phase
The head end of upper brachium pontis the be connected points of common connection that formed is as the positive pole of dc bus, and under three-phase, the tail end of brachium pontis is connected and is formed
Points of common connection is as the negative pole of dc bus；
The both positive and negative polarity voltage of described dc bus puts on to be treated in DC ice-melting；
Described back brake part includes that interconnection switch, the first grid-connected switch of exchange, the second grid-connected switch of exchange, the first direct current change
It is isolated switch, the second direct current commutation disconnecting switch；
Described upper brachium pontis exchanges grid-connected switch by brachium pontis reactor and first and is connected to I section ac bus, described lower bridge
Arm exchanges grid-connected switch by brachium pontis reactor and second and is connected to II section ac bus, in upper brachium pontis reactor and the first exchange
Between the junction point of the junction point of grid-connected switch and lower brachium pontis reactor and the second grid-connected switch of exchange, described interconnection switch is set；
The positive DC outlet side of described container type DC deicing system connects the first direct current commutation disconnecting switch；
The negative DC outlet side of described container type DC deicing system connects the second direct current commutation disconnecting switch；
Described a kind of container type DC deicing system uses the control mode of points of common connection potential shift, is specially
The modulating wave of upper and lower bridge arm adds opposite polarity direct current biasing component so that it is produce between the points of common connection of upper and lower bridge arm
Raw DC voltage difference, it is achieved continuously adjustable VD；
Described a kind of container type DC deicing system uses each the first mutually independently operable direct current commutation at DC side
Disconnecting switch and the second direct current commutation disconnecting switch, it is achieved the de-icing method different to three-phase line；
Described a kind of container type DC deicing system has no-power compensation function in addition to DC ice melting concurrently, its reactive-load compensation merit
Can both can compensate for single hop busbar voltage, also can two sections of busbar voltages of independent compensation, ice melting system can be by interconnection switch to change
Its topology.
The present invention further discloses a kind of control method based on aforementioned container type DC deicing system (i.e. topology
Changing method), it is characterised in that said method comprising the steps of:
(1) when described container type DC deicing system independently carries out reactive-load compensation to two sections of ac bus, connection is disconnected
Network switchs, and Guan Bi the first grid-connected switch of exchange and second exchanges grid-connected switch；
(2) when described container type DC deicing system only carries out reactive-load compensation to a certain section of ac bus, Guan Bi connection
The grid-connected switch of exchange that network switchs and ac bus to be compensated is corresponding, disconnects another and exchanges grid-connected switch；
(3) when described container type DC deicing system runs on DC ice melting, described container-type DC ice melting system
System need to be from same section of ac bus power taking, and in Guan Bi figure, interconnection switch and one of them grid-connected switch of exchange are to realize from exchange
Bus I section or II section power taking, to realize the ice-melt to another section of bus.
The method have the advantages that
A kind of container type DC deicing system of the present invention has reactive-load compensation, DC ice melting function concurrently, is installed on collection
In vanning, it is simple to transport, functional structure divides clear, runs required back brake switch few, uses points of common connection potential shift
Control method can realize zero continuously adjustabe of VD.
Accompanying drawing explanation
Fig. 1 one packaging type DC de-icing device major loop topological diagram；
Fig. 2 H bridge power model topology diagram；
Fig. 3 direct current ice melting system container arrangement；
Fig. 4 direct current ice melting system upper and lower bridge arm modulating wave
Fig. 5 DC side phase-change switch connection；
Fig. 6 DC de-icing device 1-1 mode of connection；
Fig. 7 DC de-icing device 1-2 mode of connection.
Detailed description of the invention
Former to a kind of container type DC deicing system of present invention design and the technology of control method below in conjunction with the accompanying drawings
Reason and embodiment are described in detail.
The major loop topology of a kind of container type DC deicing system designed by the present invention as shown in Figure 1, described one
Plant container type DC deicing system and include power section, back brake part.Described a kind of container type DC deicing system uses
Container mode is installed, and power section is installed on two containers, switch back brake is partly installed in a container (such as Fig. 3
Shown in).
Described power section includes six brachium pontis reactors of six brachium pontis of three-phase and correspondence, and each brachium pontis is by N(N > 1) individual entirely
Bridge module is composed in series, and as shown in Figure 2, on three-phase, the head end of brachium pontis is connected as common DC bus full-bridge modules structure
Left side DC+ in positive pole such as accompanying drawing 1, under three-phase, the tail end of brachium pontis is connected the negative pole as common DC bus, such as left side in accompanying drawing 1
DC-, device VD is left side UDC in accompanying drawing 1.
QF1, QF2 shown in accompanying drawing 1 are the first grid-connected switch of exchange and second exchange of brachium pontis under brachium pontis, three-phase on three-phase
Grid-connected switch, L1, L2, L3 are the brachium pontis reactor of brachium pontis on three-phase, and L4, L5, L6 are the linked reactor of brachium pontis under three-phase,
QF3 is interconnection switch, and QS1, QS2 are the first direct current commutation disconnecting switch of DC output side and the second direct current commutation is kept apart
Close.
Described a kind of container type DC deicing system is divided into power section and switch back brake part, and two parts function is relative
Independent, use container to install, as shown in Figure 3, container type DC deicing system is by two power casees, a switch back brake
Case form, wherein pattern switching time required to switch operation only switch back brake case in can complete, described power case and
Switch back brake box function is relatively independent, only needs three-phase alternating current cable, a pole unidirectional current between described power case and switch back brake case
Cable connect, between said two power case without cable connect, between case connect cable few, it is easy to construction, can independent transport, can enter
Row different size power case and the combination switching back brake case.
Described a kind of container type DC deicing system has reactive-load compensation, DC ice melting function, the switching of two kinds of functions concurrently
Can be realized by switch back brake.
When direct current ice melting system runs on reactive-load compensation operating mode, as two sections of ac bus carried out independent compensation, then
As shown in Figure 1, can be disconnected by interconnection switch QF3, first exchanges grid-connected switch QF1, the second exchange grid-connected switch QF2 Guan Bi,
Being equivalent to bridge on the three-phase of ice melting system and form the SVG that a star connects, the lower bridge of three-phase brachium pontis forms the SVG that a star connects, two SVG
Respectively ac bus I section, II section are carried out reactive-load compensation.When need to compensate ac bus I section simultaneously, Guan Bi contact is opened
Close QF3, the first grid-connected switch QF1 of exchange, disconnect the second grid-connected switch QF2 of exchange, then three-phase upper and lower bridge arm is equivalent to and through transport
Two stars of row meet SVG, compensate ac bus I section simultaneously.
When direct current ice melting system runs on DC ice melting operating mode, it is only capable of from same section of ac bus power taking, as from exchange
Bus I section power taking, the most as shown in Figure 1, Guan Bi the first exchange grid-connected switch QF1, interconnection switch QF3, disconnect the second exchange also
Net switch QF2, then DC de-icing device is only from ac bus I section power taking.
When described a kind of container type DC deicing system runs on DC ice melting operating mode, DC side output voltage can zero
Continuously adjustabe, its control method is to add opposite polarity DC component in the modulating wave of three-phase upper and lower bridge arm, such as accompanying drawing 4 institute
Show upper and lower bridge arm modulating wave, wherein go up in brachium pontis the DC component adding 0.225, the modulating wave of lower brachium pontis adds-0.225
DC component, on its three-phase, the common connecting point of brachium pontis produces direct current pressure by corresponding with under three-phase between the common connecting point of brachium pontis
Difference, along with the DC component added in modulating wave is different, DC differential pressure changes the most therewith, when the DC component that modulating wave is added
When being 0, the modulating wave of upper and lower bridge arm is identical, and the current potential of the public point of contact of upper and lower bridge arm is identical, its direct current exported
Voltage is zero；When the DC component added in modulating wave is for time maximum, and the potential difference of upper and lower bridge arm common connecting point is up to
Maximum, namely the exportable maximum DC voltage of direct current ice melting system.
Described a kind of container type DC deicing system uses three-phase independently operable at the both positive and negative polarity that direct current exports
Disconnecting switch, short circuit between each output mutually of two disconnecting switch, required DC ice-melting is connected to the public of two disconnecting switch
Junction, as shown in Figure 5.Current de-icing method mainly includes as shown in Figure 6 shown in 1-1 connection and accompanying drawing 7
1-2 connection, when using 1-1 connection, the operational approach of DC side disconnecting switch is: corresponding step 1, closes the first direct current
The A1 phase of commutation disconnecting switch QS1 and the C2 phase of the second direct current commutation disconnecting switch QS2, with DC voltage is put on AC phase it
Between circuit carry out connect ice-melt；Corresponding step 2, the A1 phase and the second direct current that close the first direct current commutation disconnecting switch QS1 change
It is isolated the B2 phase of switch QS2, carries out ice-melt VD being put on the circuit between AB phase.Connect when using 2-1
During collimation method ice-melt, the operational approach of DC side disconnecting switch is: corresponding step 1, closes the first direct current commutation disconnecting switch QS1
A1, B1 phase and the C2 phase of the second direct current commutation disconnecting switch QS2, it is achieved connect with C phase line after A, B phase line parallel connection, will again
DC voltage puts on the two ends of circuit；Corresponding step 2, closes A1, C1 phase and second of the first direct current commutation disconnecting switch QS1
The B2 phase of direct current commutation disconnecting switch QS2, it is achieved connect with B phase line again after A, C phase line parallel connection；Corresponding step 2, Guan Bi the
B1, C1 phase of one direct current commutation disconnecting switch QS1 and the A2 phase of the second direct current commutation disconnecting switch QS2, it is achieved B, C phase line is also
Connect with B phase line again after connection.Different de-icing methods is finally realized by the above-mentioned operation to direct-current isolating switch.
Above embodiment is a concrete implementing circuit schematic diagram of the present invention, does not limit the guarantor of the present invention with this
Protect scope.
Claims (8)
1. a container type DC deicing system, it is characterised in that:
Described container type DC deicing system includes power section, back brake part；
Described container type DC deicing system uses container mode to install, and power section is installed on two containers and forms two
Individual power case, back brake form a switch back brake case in being partly installed in a container；
Described container type DC deicing system uses the structure arranging method divided by function, described power case and switch back brake
Box function is relatively independent, is connected by cable, without connecting line between two power casees between power case with switch back brake case；
Described container type DC deicing system uses the control mode of points of common connection potential shift so that in DC ice melting system
DC voltage difference is produced, it is achieved continuously adjustable direct current output electricity between the points of common connection of the upper and lower bridge arm of system power section
Pressure；
Described power section uses three-phase chain structure, Y-connection, respectively by a upper brachium pontis and a lower brachium pontis and correspondence
Brachium pontis reactor composition, each brachium pontis is made up of N number of full bridge power block coupled in series, and wherein N is the integer more than 1；Bridge on three-phase
The be connected points of common connection that formed of the head end of arm as the positive pole of dc bus, under three-phase the tail end of brachium pontis be connected formed public
Junction point is as the negative pole of dc bus；
Described dc bus both positive and negative polarity voltage puts on to be treated in DC ice-melting；
Described back brake part include interconnection switch, first exchange grid-connected switch, second exchange grid-connected switch, the first direct current commutation every
Leave pass, the second direct current commutation disconnecting switch；
Described upper brachium pontis exchanges grid-connected switch by corresponding brachium pontis reactor and first and is connected to I section ac bus, described under
Brachium pontis exchanges grid-connected switch by corresponding brachium pontis reactor and second and is connected to II section ac bus, upper brachium pontis reactor with
Arrange described between the junction point of the first junction point exchanging grid-connected switch and lower brachium pontis reactor and the second grid-connected switch of exchange
Interconnection switch；
The positive DC outlet side of described container type DC deicing system connects the first direct current commutation disconnecting switch；
The negative DC outlet side of described container type DC deicing system connects the second direct current commutation disconnecting switch；
Described container type DC deicing system uses each the first mutually independently operable direct current commutation disconnecting switch at DC side
With the second direct current commutation disconnecting switch, it is achieved the de-icing method different to three-phase line；
Described container type DC deicing system has no-power compensation function in addition to DC ice melting concurrently, and its no-power compensation function both can be mended
Repay single hop busbar voltage, also can two sections of busbar voltages of independent compensation, ice melting system can be by interconnection switch to change its topology.
Container type DC deicing system the most according to claim 1, it is characterised in that:
Described full bridge power module is H bridge construction, is made up of four turn-off device Q1～Q4 and direct current support capacitor C,
The colelctor electrode of turn-off device Q1 with Q3 of top is connected with the positive pole of direct current support capacitor C, the turn-off device Q2 of lower section
It is connected with the negative pole of direct current support capacitor C with the emitter stage of Q4；The emitter stage of turn-off device Q1 is with turn-off device Q2's
Colelctor electrode is connected, and forms the colelctor electrode of the head end of full bridge power module, the emitter stage of turn-off device Q3 and turn-off device Q4
It is connected, forms the end of full bridge power module.
Container type DC deicing system the most according to claim 1 and 2, it is characterised in that:
Described power section, in addition to forming the full bridge power module of each phase upper and lower bridge arm, also includes wind-cooling heat dissipating system, control
System, described wind-cooling heat dissipating system is used for power model, AC-DC switch for the heat radiation of each power model, described control system
Control and protection.
Container type DC deicing system the most according to claim 3, it is characterised in that:
Described container type DC deicing system uses the control mode of points of common connection potential shift, i.e. at described DC ice melting
The upper and lower bridge arm modulating wave of system adds contrary DC component so that it is points of common connection current potential is not zero, between upper and lower bridge arm
Points of common connection between produce controlled voltage difference, thus realize VD and start from scratch continuously may be used to rated voltage
Adjust.
Container type DC deicing system the most according to claim 3, it is characterised in that:
Brachium pontis and the reactor of series connection corresponding with upper brachium pontis on the three-phase of the power section of described container type DC deicing system,
It is respectively arranged in two containers two power casees of formation with the reactor of brachium pontis under three-phase and series connection corresponding with lower brachium pontis, falls
Lock forms a switch back brake case in being partly installed in a container；
When need to carry out topology switching, in switch back brake case, only exchange grid-connected switch, the second exchange grid-connected switch, contact to first
Switch, the first direct current commutation disconnecting switch, the second direct current commutation disconnecting switch, control system operate；
Function opposite independent between power case and switch back brake case, can realize building block system combination, and each casing can independent transport.
6. according to the container type DC deicing system described in claim 1,2 or 5 any claim, it is characterised in that:
Described container type DC deicing system uses the control mode of points of common connection potential shift, i.e. at described DC ice melting
The upper and lower bridge arm modulating wave of system adds contrary DC component so that it is points of common connection current potential is not zero, between upper and lower bridge arm
Points of common connection between produce controlled voltage difference, thus realize VD and start from scratch continuously may be used to rated voltage
Adjust.
7. a control method based on the container type DC deicing system described in claim 1-6 any claim, its
Being characterised by, described control method comprises the following steps:
(1) when described container type DC deicing system independently carries out reactive-load compensation to two sections of ac bus, disconnect contact and open
Closing, Guan Bi the first grid-connected switch of exchange and second exchanges grid-connected switch；
(2) when described container type DC deicing system only carries out reactive-load compensation to a certain section of ac bus, Guan Bi contact is opened
Close and the grid-connected switch of exchange corresponding to ac bus to be compensated, disconnect another and exchange grid-connected switch；
(3) when described container type DC deicing system runs on DC ice melting, described container type DC deicing system needs
From same section of ac bus power taking, Guan Bi interconnection switch and one of them grid-connected switch of exchange to realize from same section of exchange mother
Line power taking.
Control method the most according to claim 7, it is characterised in that:
In step (3), described container type DC deicing system uses three-phase independently to operate at the positive and negative interpolar of DC output side
Commutation disconnecting switch, two commutation disconnecting switch export mutually between short circuit, required DC ice-melting one end access two commutations every
Leave the public connection place of pass, other end three-phase short circuit, by the operation of two commutation disconnecting switch to realize three-phase ice-melt
The different de-icing methods of circuit.
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| CN201310741404.1A CN103715643B (en) | 2013-12-27 | 2013-12-27 | A kind of container type DC deicing system and control method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107546698A (en) * | 2017-09-05 | 2018-01-05 | 许继电气股份有限公司 | A kind of DC de-icing device based on MMC topological structures |
| CN107546726A (en) * | 2017-09-20 | 2018-01-05 | 湖南省湘电试研技术有限公司 | Intensive DC de-icing device SVG power models bypass structure and its control method |
| CN114977059A (en) * | 2022-04-19 | 2022-08-30 | 杭州佳辰电力科技有限公司 | Direct-current ice melting method, device and system based on distributed energy storage power station |
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| CN103715643A (en) | 2014-04-09 |
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