CN103715643A - Container type DC deicing system and control method - Google Patents
Container type DC deicing system and control method Download PDFInfo
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- CN103715643A CN103715643A CN201310741404.1A CN201310741404A CN103715643A CN 103715643 A CN103715643 A CN 103715643A CN 201310741404 A CN201310741404 A CN 201310741404A CN 103715643 A CN103715643 A CN 103715643A
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Abstract
The invention provides a container type DC deicing system and a control method. The topology of a main circuit of the DC deicing system is of a three-phase chain structure. Each phase is formed by an upper bridge arm, a lower bridge arm and corresponding bridge arm electric reactors. Each bridge arm is formed by connecting N full-bridge power modules in series. A common connection point where the head ends of the upper bridge arms of the three phases are connected is used as the positive pole of a DC bus. A common connection point where the tail ends of the lower bridge arms of the three phases are connected is used as the negative pole of the DC bus. The DC deicing system is installed in a container and is divided into two power boxes and a switching box according to functions, so the container type DC deicing system is clear in structural division, convenient to transport and simple in switching operation. The container type DC deicing system has the functions of reactive compensation and DC deicing, is convenient to transport due to the fact that the DC deicing system is installed in the container, and is clear in functional and structural division and fewer in required switching switches, and the purpose that DC output voltages starting from the zero voltage can be continuously adjusted through the adoption of a common connection point potential deviation control method can be achieved.
Description
Technical field
The invention belongs to electronic power convertor technical field, be specifically related to a kind of container-type direct current ice melting system and control method.
Background technology
In recent years the freezing sleet disaster in south China area takes place frequently, and transmission line large area icing in electrical network causes in power transmission network and occurs a large amount of broken strings, the tower that falls causing large-area power outage, also makes fast quick-recovery power transmission become very difficult.After southern ice damage in 2008, China's power industry has been done large quantity research to the ice-melt of transmission line, and has in succession developed based on not controlling rectifier bridge, DC de-icing device based on SVC, and has obtained certain effect.Wherein the DC de-icing device based on SVC can work in Reactive Compensation Mode at ordinary times, while needing, can transfer major loop topology to DC ice melting state by the switching of switch, can improve the utilization rate of equipment, has obtained application comparatively widely.
Yet when stating device in the use, also there are some problems, as serious in the DC de-icing device harmonic pollution based on SVC, need to be equipped with corresponding harmonic wave and eliminate equipment; Device volume is large, and complexity is installed, and when topology is switched, back brake is complicated, need to could realize through the switching of a plurality of switches.During particularly as wheeled apparatus, though can adopt container mode to install, container, rectifier transformer are bulky, and transportation is inconvenience very, do not possess portable due installation simply, the feature that puts into operation fast.
Along with the development of power electronic technology, introduced full-control type device to solve the ubiquitous harmonic problem of Thyristor Controlled rectifier.But in chain structure, total module direct voltage suspends separately, there is no public DC bus, thereby cannot be directly used in the middle of DC ice melting, also there is not yet the bibliographical information of related art scheme at present.In addition, also propose to carry out DC ice melting by the many level of half-bridge moduleization (HBMMC) scheme of HVDC Light (HVDC Light), HVDC Light has common DC bus, the condition that possesses natively high direct voltage output, its AC connects electrical network simultaneously, also possesses dynamic passive compensation ability.But, utilize also having some limitations property of HVDC Light technology ice-melt, wherein outstanding is exactly that the adjustable extent of HBMMC output dc voltage is little, must more than the direct voltage that meets controlled rectification condition, regulate, the transmission line that cannot effectively adapt to different length, thereby the availability factor 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, a kind of DC de-icing device and control method of container-type are proposed, this ice melting system major loop adopts the modularization multi-level converter based on full-bridge module, the points of common connection of three-phase upper and lower bridge arm is drawn the both positive and negative polarity as common DC bus, this device can be realized zero and play pressure regulation, and exportable higher direct voltage is to realize the ice-melt to different circuits.
The following scheme of the concrete employing of the present invention:
A container-type direct current ice melting system, is characterized in that:
Described a kind of container-type direct current ice melting system comprises power section, back brake part;
Described a kind of container-type direct current ice melting system adopts container mode to install, and power section is installed on two containers, switch back brake is partly installed in a container;
Described a kind of container-type direct current ice melting system adopts the structure arranging method of dividing by function, and described power case and switch back brake box function are relatively independent, between power case and switch back brake case, by cable, be connected, between two power casees without connecting line;
Described power section adopts three-phase chain structure, Y-connection, respectively by one, goes up brachium pontis and a lower brachium pontis and corresponding brachium pontis reactor and forms, and each brachium pontis is composed in series by N full bridge power module, and wherein N is greater than 1 integer; On three-phase, the head end of brachium pontis is connected the points of common connection that forms as the positive pole of DC bus, the tail end of the brachium pontis points of common connection that the forms negative pole as DC bus that is connected under three-phase;
The both positive and negative polarity voltage of described DC bus puts on to be treated in DC ice-melting;
Described back brake partly comprises that interconnection switch, first exchanges grid-connected switch, second and exchanges grid-connected switch, the first direct current commutation isolating switch, the second direct current commutation isolating 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 brachium pontis exchanges grid-connected switch by brachium pontis reactor and second and is connected to II section ac bus, exchanges between the tie point of grid-connected switch and lower brachium pontis reactor exchanges grid-connected switch tie point with second described interconnection switch is set at upper brachium pontis reactor with first;
The anodal direct current outlet side of described container-type direct current ice melting system connects the first direct current commutation isolating switch;
The negative pole direct current outlet side of described container-type direct current ice melting system connects the second direct current commutation isolating switch;
Described a kind of container-type direct current ice melting system adopts the control mode of points of common connection potential shift, be specially and in the modulating wave of upper and lower bridge arm, add opposite polarity direct current biasing component, make it between the points of common connection of upper and lower bridge arm, produce DC voltage difference, realize continuously adjustable VD;
Described a kind of container-type direct current ice melting system adopts in DC side the first direct current commutation isolating switch and the second direct current commutation isolating switch that each mutually can independent operation, realizes the de-icing method different to three-phase line;
Described a kind of container-type direct current ice melting system has no-power compensation function concurrently except DC ice melting, and its no-power compensation function both can compensate single hop busbar voltage, also can two sections of busbar voltages of independent compensation, and ice melting system can be by interconnection switch to change its topology.
The present invention also further discloses a kind of control method (being topological changing method) based on aforementioned container-type direct current ice melting system, it is characterized in that, said method comprising the steps of:
(1) when described container-type direct current ice melting system independently carries out reactive power compensation to two sections of ac bus, disconnect interconnection switch, closed first exchanges grid-connected switch exchanges grid-connected switch with second;
(2) when described container-type direct current ice melting system only carries out reactive power compensation to a certain section of ac bus, the grid-connected switch of interchange that closed interconnection switch and ac bus to be compensated are corresponding, disconnects another and exchanges grid-connected switch;
(3) when described container-type direct current ice melting system runs on DC ice melting, described container-type direct current ice melting system need be from same section of ac bus power taking, in closed figure, interconnection switch and one of them exchange grid-connected switch to realize from ac bus I section or the power taking of II section, to realize the ice-melt to another section of bus.
The present invention has following beneficial effect:
A kind of container-type direct current ice melting system of the present invention has reactive power compensation, DC ice melting function concurrently, be installed in container, be convenient to transportation, it is clear that functional structure is divided, move required back brake switch few, the control method of employing points of common connection potential shift can realize zero of VD and rise adjustable continuously.
Accompanying drawing explanation
A kind of packaging type DC de-icing device of Fig. 1 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.
Embodiment
Below in conjunction with accompanying drawing, a kind of container-type direct current ice melting system of the present invention's design and know-why and the embodiment of control method are described in detail.
As shown in Figure 1, described a kind of container-type direct current ice melting system comprises power section, back brake part to the major loop topology of a kind of container-type direct current ice melting system that the present invention is designed.Described a kind of container-type direct current ice melting system adopts container mode to install, and power section is installed on two containers, switch back brake is partly installed in a container (as shown in Figure 3).
Described power section comprises six brachium pontis of three-phase and six corresponding brachium pontis reactors, each brachium pontis is by N(N>1) individual full-bridge module is composed in series, full-bridge modular structure as shown in Figure 2, on three-phase, the head end of brachium pontis is connected as the positive pole of common DC bus as left side DC+ in accompanying drawing 1, under three-phase, the tail end of brachium pontis is connected as the negative pole of common DC bus, as left side DC-in accompanying drawing 1, device VD is left side UDC in accompanying drawing 1.
QF1, QF2 shown in accompanying drawing 1 first of brachium pontis exchange grid-connected switch and second and exchange grid-connected switch under brachium pontis, three-phase on three-phase, L1, L2, L3 are the brachium pontis reactor of brachium pontis on three-phase, 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 isolating switch and the second direct current commutation isolating switch of direct current outlet side.
Described a kind of container-type direct current ice melting system is divided into power section and switch back brake part, two parts function opposite independent, employing container is installed, as shown in Figure 3, container-type direct current ice melting system is by two power casees, a switch back brake case forms, requiredly when wherein pattern is switched to the operation of switch, only in switch back brake case, can complete, described power case and switch back brake box function are relatively independent, between described power case and switch back brake case, only need three-phase alternating current cable, one utmost point direct current cables connects, between described two power casees, without cable, connect, between case, stube cable is few, be easy to construction, can independently transport, can carry out the combination of different size power case and switch back brake case.
Described a kind of container-type direct current ice melting system has reactive power compensation, DC ice melting function concurrently, and the switching of two kinds of functions can realize by switch back brake.
When direct current ice melting system runs on reactive power compensation operating mode, as carried out independent compensation to two sections of ac bus, as shown in Figure 1, interconnection switch QF3 can be disconnected, first exchanges grid-connected switch QF1, second exchanges grid-connected switch QF2 closure, be 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, and two SVG carry out reactive power compensation to ac bus I section, II section respectively.In the time need compensating ac bus I section simultaneously, closed interconnection switch QF3, first exchanges grid-connected switch QF1, disconnect second and exchange grid-connected switch QF2, two stars that three-phase upper and lower bridge arm is equivalent to parallel running meet SVG, ac bus I section are compensated simultaneously.
When direct current ice melting system runs on DC ice melting operating mode, only can be from same section of ac bus power taking, as from the power taking of ac bus I section, as shown in Figure 1, closed first exchanges grid-connected switch QF1, interconnection switch QF3, disconnect second and exchange grid-connected switch QF2, DC de-icing device is only from the power taking of ac bus I section.
When described a kind of container-type direct current ice melting system runs on DC ice melting operating mode, DC side output voltage can zeroly rise adjustable continuously, its control method for adding opposite polarity DC component in the modulating wave of three-phase upper and lower bridge arm, upper and lower bridge arm modulating wave as shown in Figure 4, wherein go up and in brachium pontis, added 0.225 DC component, in the modulating wave of lower brachium pontis, add-0.225 DC component, on its three-phase between the common connecting point of the common connecting point of brachium pontis and brachium pontis under three-phase by the corresponding DC differential pressure that produces, along with the DC component adding in modulating wave is different, DC differential pressure also changes thereupon, when the DC component adding when modulating wave is 0, the modulating wave of upper and lower bridge arm is identical, the current potential of the public point of contact of upper and lower bridge arm is identical, its direct voltage of exporting is zero, when the DC component adding in modulating wave is maximum, it is maximum that the potential difference of upper and lower bridge arm common connecting point will reach, and be also the exportable maximum direct voltage of direct current ice melting system.
Described a kind of container-type direct current ice melting system adopts the isolating switch that three-phase can independent operation at the both positive and negative polarity place of direct current output, each of two isolating switches be short circuit between output mutually, required DC ice-melting is connected in the public junction of two isolating switches, as shown in Figure 5.Current de-icing method mainly comprises the 1-2 connection shown in 1-1 connection as shown in Figure 6 and accompanying drawing 7, when adopting 1-1 connection, the method of operation of DC side isolating switch is: corresponding step 1, the closed A1 phase of the first direct current commutation isolating switch QS1 and the C2 phase of the second direct current commutation isolating switch QS2, to put on direct voltage the ice-melt of connecting of the circuit of AC between mutually; Corresponding step 2, the B2 phase of the A1 phase of closed the first direct current commutation isolating switch QS1 and the second direct current commutation isolating switch QS2, carries out ice-melt with circuit VD being put between AB phase.When adopting the ice-melt of 2-1 connection, the method of operation of DC side isolating switch is: corresponding step 1, the C2 phase of A1, B1 phase and the second direct current commutation isolating switch QS2 of closed the first direct current commutation isolating switch QS1, after realizing A, the parallel connection of B phase circuit, connect with C phase circuit again, direct voltage is put on to the two ends of circuit; Corresponding step 2, the B2 phase of the A1 of closed the first direct current commutation isolating switch QS1, C1 phase and the second direct current commutation isolating switch QS2, connects with B phase circuit after realizing A, the parallel connection of C phase circuit again; Corresponding step 2, the A2 phase of the B1 of closed the first direct current commutation isolating switch QS1, C1 phase and the second direct current commutation isolating switch QS2, connects with B phase circuit after realizing B, the parallel connection of C phase circuit again.By above-mentioned, the operation of direct-current isolating switch is finally realized to different de-icing methods.
Above embodiment is a concrete implementing circuit schematic diagram of the present invention, with this, does not limit protection scope of the present invention.
Claims (8)
1. a container-type direct current ice melting system, is characterized in that:
Described a kind of container-type direct current ice melting system comprises power section, back brake part;
Described a kind of container-type direct current ice melting system adopts container mode to install, and power section is installed on two containers, switch back brake is partly installed in a container;
Described a kind of container-type direct current ice melting system adopts the structure arranging method of dividing by function, and described power case and switch back brake box function are relatively independent, between power case and switch back brake case, by cable, be connected, between two power casees without connecting line.
2. container-type direct current ice melting system according to claim 1, is characterized in that:
Described power section adopts three-phase chain structure, Y-connection, respectively by one, goes up brachium pontis and a lower brachium pontis and corresponding brachium pontis reactor and forms, and each brachium pontis is composed in series by N full bridge power module, and wherein N is greater than 1 integer; On three-phase, the head end of brachium pontis is connected the points of common connection that forms as the positive pole of DC bus, the tail end of the brachium pontis points of common connection that the forms negative pole as DC bus that is connected under three-phase;
Described DC bus both positive and negative polarity voltage puts on to be treated in DC ice-melting;
Described back brake partly comprises that interconnection switch, first exchanges grid-connected switch, second and exchanges grid-connected switch, the first direct current commutation isolating switch, the second direct current commutation isolating 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 lower brachium pontis exchanges grid-connected switch by corresponding brachium pontis reactor and second and is connected to II section ac bus, exchanges between the tie point of grid-connected switch and lower brachium pontis reactor exchanges grid-connected switch tie point with second described interconnection switch is set at upper brachium pontis reactor with first;
The anodal direct current outlet side of described container-type direct current ice melting system connects the first direct current commutation isolating switch;
The negative pole direct current outlet side of described container-type direct current ice melting system connects the second direct current commutation isolating switch;
Described a kind of container-type direct current ice melting system adopts the control mode of points of common connection potential shift, makes it between the points of common connection of upper and lower bridge arm, produce DC voltage difference, realizes continuously adjustable VD;
Described a kind of container-type direct current ice melting system adopts in DC side the first direct current commutation isolating switch and the second direct current commutation isolating switch that each mutually can independent operation, realizes the de-icing method different to three-phase line;
Described a kind of container-type direct current ice melting system has no-power compensation function concurrently except DC ice melting, and its no-power compensation function both can compensate single hop busbar voltage, also can two sections of busbar voltages of independent compensation, and ice melting system can be by interconnection switch to change its topology.
3. a kind of container-type direct current ice melting system according to claim 1, is characterized in that:
Described full bridge power module is H bridge construction, by four turn-off device Q1～Q4 and direct current support capacitor C, formed, the turn-off device Q1 of top and the collector electrode of Q3 are connected with the positive pole of direct current support capacitor C, and the turn-off device Q2 of below and the emitter of Q4 are connected with the negative pole of direct current support capacitor C; The emitter of turn-off device Q1 is connected with the collector electrode of turn-off device Q2, forms the head end of full bridge power module, and the emitter of turn-off device Q3 is connected with the collector electrode of turn-off device Q4, forms the end of full bridge power module.
4. a kind of container-type direct current ice melting system according to claim 1 and 2, is characterized in that:
Described power section is except forming the full bridge power module of each phase upper and lower bridge arm; also comprise wind-cooling heat dissipating system, control system; described wind-cooling heat dissipating system is for the heat radiation of each power model, and described control system is used for the control of power model, AC-DC switch and protection.
5. a kind of container-type direct current ice melting system according to claim 4, is characterized in that:
On the three-phase of the power section of described a kind of container-type direct current ice melting system brachium pontis and with the reactor of the corresponding series connection of upper brachium pontis, with brachium pontis under three-phase and with the reactor of the corresponding series connection of lower brachium pontis, be installed on respectively in two containers and form two power casees, switch back brake is partly installed on a switch back brake case of formation in a container;
In the time of need carrying out topology switching, only the grid-connected switch of the first interchange, second is exchanged the operation of grid-connected switch, interconnection switch, the first direct current commutation isolating switch, the second direct current commutation isolating switch, control system in switch back brake case;
Function opposite independent between power case and switch back brake case,, can realize cordwood system type combination, each casing can independently transport.
6. according to the control method of a kind of container-type direct current ice melting system described in the arbitrary claim of claim 1-5, it is characterized in that:
Described a kind of container-type direct current ice melting system adopts the control mode of points of common connection potential shift, in the upper and lower bridge arm modulating wave of described direct current ice melting system, add contrary DC component, make its points of common connection current potential non-vanishing, between the points of common connection between upper and lower bridge arm, produce controlled voltage difference, thereby realize start from scratch adjustable continuously to rated voltage of VD.
7. a control method for the container-type direct current ice melting system based on described in claim 1-6, is characterized in that, described control method comprises the following steps:
(1) when described container-type direct current ice melting system independently carries out reactive power compensation to two sections of ac bus, disconnect interconnection switch, closed first exchanges grid-connected switch exchanges grid-connected switch with second;
(2) when described container-type direct current ice melting system only carries out reactive power compensation to a certain section of ac bus, the grid-connected switch of interchange that closed interconnection switch and ac bus to be compensated are corresponding, disconnects another and exchanges grid-connected switch;
(3) when described container-type direct current ice melting system runs on DC ice melting, described container-type direct current ice melting system need be from same section of ac bus power taking, and in closed figure, interconnection switch and one of them exchange grid-connected switch to realize from same section of ac bus power taking.
8. control method according to claim 7, is characterized in that:
In step (3), described a kind of container-type direct current ice melting system adopts the commutation isolating switch of three-phase independent operation between direct current outlet side both positive and negative polarity, two commutation isolating switches each mutually output between short circuit, the public connection place of two commutation isolating switches of required DC ice-melting one end access, other end three-phase short circuit, by the operation of two commutation isolating switches to realize the different de-icing methods with three-phase DC ice-melting.
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| 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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| CN103715643B (en) | 2016-08-17 |
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