CN101505043A - Method for automatically switching between DC ice melting three-phase AC line - Google Patents
Method for automatically switching between DC ice melting three-phase AC line Download PDFInfo
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- CN101505043A CN101505043A CNA2009100257221A CN200910025722A CN101505043A CN 101505043 A CN101505043 A CN 101505043A CN A2009100257221 A CNA2009100257221 A CN A2009100257221A CN 200910025722 A CN200910025722 A CN 200910025722A CN 101505043 A CN101505043 A CN 101505043A
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Abstract
The invention relates to a method for automatically switching a DC ice-melting three-phase AC circuit. A DC ice-melting main loop comprises a rectifier, a control protection device, and DC side switches. A three-phase AC power supply is connected to a three-phase input of a valve group of the rectifier, namely a current converter. An anode output and a cathode output of the rectifier are connected to the three-phase AC circuit needing the ice-melting respectively through two groups of DC side isolation switches in a DC ice-melting mode to form the DC ice-melting main loop, and DC ice-melting is carried out on the three-phase AC circuit. The DC side isolation switches are controlled to automatically switch a three-phase conducting wire to connect the rectifier for the ice-melting by operating the control and the DC side isolation switches according to the operation state of ice-melting equipment. The operation of the rectifier and the DC side switches is controlled by an automatic sequence in the switching process. The method makes the three-phase conducting wire evenly heated, reduces the switch transferring operation of switching on or switching off the switches and the wire connecting work in ice-melting sites at the same time, and greatly improves the safety and reliability of systems.
Description
Technical field
The present invention relates to DC ice melting three-phase AC line method that automaticallyes switch and the device that reaches this method of application.
Background technology
Transmission line is the safe operation of icing serious threat electric power system in the winter time.Owing to increased ice load on the lead, all can bring certain mechanical failure to lead, iron tower and gold utensil, can break, fall shaft tower when icing is serious, cause large area blackout, national economy is caused heavy losses.
Several thinkings of research ice-melt both at home and abroad are: electric energy is converted into the heat energy ice-melt; Electric energy is converted into mechanical energy to destroy the physical structure of the icing on the power transmission line, reaches the purpose that icing is come off; Directly destroy the Mechanical Method deicing of physical structure.After U.S.A added ice damage in 1998, pay much attention to the research of anti-icing, anti-ice and de-icing technology in the world, but all do not enter the practical stage.
Better action with regard to adopt the ac short circuit method that serious icing circuit is carried out ice-melt always, has played to preventing ice damage in China on the following circuit of 220kV since the seventies in last century.Need very high heat owing to exchange ice-melt, and there is reactance in the alternating current circuit, the ice-melt power supply capacity that requires when causing 220kV and following line ice-melting is 5～10 times of the actual ice-melt power of circuit; The ice-melt power supply capacity that requires during for above superhigh pressure of 500kV and ultrahigh voltage alternating current transmission lines ice-melt is 10～20 times of the actual ice-melt power of circuit.When implementing alternating current short circuit ice-melt, often there is the not enough problem of ice-melt power supply capacity far away.Therefore, for 500kV or voltage levels power transmission line more,, adopt ac short circuit ice-melt scheme infeasible owing to be difficult to find the ice-melt power supply that meets the demands.
DC de-icing device adopts controllable silicon (thyristor) rectifier system, and alternating current is converted into direct current, injects to exchange lead, utilizes direct current to produce heat in conductor resistance icing is melted.DC ice melting is the most effective and feasible ice-melt means that extensively are adapted to the ultra-high-tension power transmission line of each electric pressure of large-scale power grid.
Because the limitation of ac short circuit ice-melting method, in the world from the eighties in last century begin just to inquire into always DC ice melting may with develop DC de-icing device.Compare with traditional three-phase alternating current short circuit de-icing method, the DC ice melting technology also is to utilize the short circuit current de-icing method, but ice melting current is a direct current, and its power supply is provided by system's main transformer low-pressure side.The circuit equiva lent impedance depends primarily on the line resistance parameter under this method, and line impedance during much smaller than the ac short circuit ice-melt requires low to the ice-melt power supply capacity.By the summary of a large amount of practical experiences, finding to adopt DC ice melting is a kind of practical, cost-effective technical method and measure that prevents that the ice damage accident from taking place.Begun to carry out the development of relevant apparatus abroad.
When ice-melt was implemented in the alternating current circuit, the two-phase dc bus (positive and negative electrode) of DC de-icing device output needed to be connected to three-phase AC line respectively.No matter be that two phase conductors that connect three-phase AC line carry out ice-melt, still exchange a phase conductor and connect anodal (or negative pole), the other two phase conductors negative pole (or anodal) that is connected in parallel, because in the deicing processes, the electric current that flows through three-phase conducting wire is inconsistent, can cause three-phase conducting wire ice-melt degree unbalanced and cause that shaft tower damages and fault; If other phase conductors that need manually to change the pair of connecting wires alternating current circuit in the deicing processes carry out ice-melt simultaneously, the work on the spot amount is very big.
In the deicing processes, three-phase line need carry out balanced ice-melt in addition.When the unbalanced ice-melt of alternating current circuit three-phase conducting wire, can produce Tension Difference, the tower cross-arm is reversed and be out of shape, can cause also that electric clearance reduces between line, can cause shaft tower to fall the machinery and the electric accident of bar when serious.
After the North America ice storm disaster in 1998, Hydro-Quebec examines with AREVA company and cooperates, and drops into 2,500 ten thousand Euros and has developed a cover high voltage direct current deicing device, and this device is installed in the L é vis transformer station of Quebec.But up to the present, this device is not also finished field adjustable.In the ice-melt scheme of list of references [1] and [2] disclosed AREVA, only provide the major loop winding diagram, do not provide and do not see employing DC ice melting three-phase AC line automatic switching method.List of references [3] though disclose two kinds of two kinds of methods that DC ice melting is carried out balanced ice-melt, does not have concrete operations step and switching condition when openly automatic control equipment is realized automaticallying switch in addition.
List of references:
[1]Granger?M，Dutil?A，Nantel?A.Performance?aspects?of?Levis?substationde-icing?project?using?DC?technology[C].Presented?at?the?11th?Int.Workshop?onAtmospheric?Icing?of?Structures.Montreal，Canada，June?2005.
[2]Horwill?C，Davidson?C?C，Granger?M，et?al.An?application?of?HVDC?to?thede-icing?of?transmission?lines.Transmission?and?Distribution?Conference?andExhibition[c].2005/2006?IEEE?PES?Dallas，USA.
[3] Rao Hong, Li Li Cheng etc.The technical research of south electric network DC ice melting.The south electric network technology, 2008 04 month, the 2nd the 2nd phase of volume: 7～12 pages.
Summary of the invention
The objective of the invention is: by the operation of control DC side disconnecting link, the automatic switchover three-phase conducting wire is connected to rectifying device and carries out ice-melt in the DC ice melting process, the three-phase conducting wire equilibrium is heated realizes balanced ice-melt.The operation of rectifying device and DC side disconnecting link is all controlled by automatic sequence and is realized in the handoff procedure.
The technical scheme that the present invention realizes is: the method that DC ice melting three-phase AC line automaticallyes switch, the major loop of DC ice melting comprises rectifying device, control protective device and DC side disconnecting link, three-phase alternating-current supply is connected to the three-phase input that rectifying device is the valve group of converter, the both positive and negative polarity output of rectifying device is connected to the three-phase AC line that need carry out ice-melt by two groups of DC side isolation switchs respectively when the DC ice melting mode, form the DC ice melting major loop, three-phase AC line is carried out DC ice melting; It is characterized in that: according to ice-melt equipment running status difference, by control device the DC side isolation switch is carried out control operation, control DC side isolation switch automatic switchover three-phase conducting wire makes it to be connected to rectifying device and carries out ice-melt.
Wherein, when the phase sequence group of three-phase AC line was switched, according to ice-melt equipment running status difference, rise/stop automatically and grid switching operation step that the phase sequence group is switched were one of following three kinds of situations:
When 1) carrying out the phase sequence switching under the situation of deicing device DC-isolation and direct current locking, just the phase sequence pattern is switched to next group, deicing device is still preserved the DC-isolation state; Must carry out the direct current bind command again, just can connect, closed corresponding DC side isolation switch by the phase sequence group setting of this group;
When 2) carrying out the phase sequence switching under the situation of connection of deicing device direct current and direct current locking, the phase sequence pattern is switched to next group, control device and DC side disconnecting link are operated automatically; At first open the DC side isolation switch of original closure, the phase sequence group according to this group requires closed corresponding DC side isolation switch again, is transformed into new direct current connection status;
When 3) carrying out the phase sequence switching under the situation of deicing device direct current release, control device will reduce deicing device at first automatically and output current to the minimum direct current that allows; Carry out the direct current locking again, locking ice-melt rectifying device; Automatically carry out the branch closing operation of DC side disconnecting link then, and enter the direct current connection status by the phase sequence group of next group; And then carry out the direct current release, and and promote deicing device and output current to level before switching, the phase sequence group circuit of this group is carried out ice-melt;
DC-isolation: refer to that two groups of DC side isolation switch S1A, S1B, S1C, S2A, S2B, S2C all are in state separately; The direct current locking: the deicing device control wave does not send, and silicon controlled rectifier is not started working; The direct current release: the deicing device control wave sends, and silicon controlled rectifier is started working; Direct current connects: refer to according to the predefined closed corresponding DC side isolation switch that is linked in sequence.
When switching successively, the phase sequence group need satisfy phase sequence group switch-interlocking condition as shown in Figure 2: in not being in the direct current lifting process, be not in the phase sequence group handoff procedure, allow the phase sequence group to switch when three conditions of time-delay of direct current locking satisfy simultaneously.In the phase sequence group handoff procedure: refer to that this group phase sequence group switching command has sent and carried out as yet end.
Wherein, ice-melting mode have two kinds selective, be respectively: first kind of ice-melting mode and second kind of ice-melting mode:
3) first kind of ice-melting mode: at every turn two phase conductors to three-phase AC line carry out ice-melt, and one links to each other with the positive pole of deicing device direct voltage, and another negative pole with the deicing device direct voltage links to each other;
4) second kind of ice-melting mode: at every turn the three-phase conducting wire to three-phase AC line carries out ice-melt, and one links to each other with the positive pole of deicing device direct voltage, two-phase and connecing in addition, and the negative pole with the deicing device direct voltage links to each other again;
Two kinds of ice-melting modes will satisfy control model switch-interlocking condition shown in Figure 1 when switching: in not being in the DC-isolation process, three conditions of time-delay of DC-isolation state, direct current locking allow to switch when satisfying simultaneously;
In the DC-isolation process: refer to carry out the DC-isolation order and do not finish as yet; DC-isolation state: refer to that two groups of DC side isolation switch S1A, S1B, S1C, S2A, S2B, S2C all are in state separately.
Wherein, ice-melt control model is divided into manual mode and automatic mode:
1) under the manual mode, after DC de-icing device is finished the alternating current circuit ice-melt of a certain phase sequence group, manually sends phase sequence group switching command by the operations staff; The DC ice melting control system realizes the grid switching operation of rise/stopping automatically of direct current and DC side isolation switch automatically, the lead of ice-melt is switched to the alternating current circuit ice-melt of next another phase sequence group of group continuation;
2) under the automatic mode, DC de-icing device carries out ice-melt T in the alternating current circuit to a certain phase sequence group
Z/ 3n will send phase sequence group switching command after the time automatically, realize direct current rise/stop automatically and DC side isolation switch grid switching operation after the alternating current circuit of next phase sequence group is carried out ice-melt T again
Z/ 3n the time, and then realize automatically direct current automatically rise/stop and DC side isolation switch grid switching operation after ice-melt T is carried out in the alternating current circuit of next phase sequence group
Z/ 3n the time, so continue, up to reaching T
ZTime stops after finishing ice-melt automatically.
Two kinds of control models will satisfy control model switch-interlocking condition shown in Figure 1 when switching: in not being in the DC-isolation process, three conditions of time-delay of DC-isolation state, direct current locking allow to switch when satisfying simultaneously.
Under the manual mode ice-melt time of a certain phase sequence by the operations staff according to circuit icing situation and meteorological condition enactment; The ice-melt time T of a certain phase sequence under the automatic mode
Z/ 3n, n is generally 1～3, T
ZBe the total time of three-phase AC line ice-melt, by the operations staff according to circuit icing situation and meteorological condition enactment.
The ice-melt total time T of three-phase line under first kind of ice-melt working method
ZBe about 1.5T, the ice-melt total time T of three-phase line under second kind of ice-melt working method
ZBe about 2T; Here T represents the cycle time of uniline ice-melt, by the operations staff according to circuit icing situation and meteorological condition enactment, T
ZExpression ice-melt total time.
Beneficial effect of the present invention: can guarantee quick, the balanced ice-melt of three-phase line, improve security of system and reliability greatly; Reduce the grid switching operation of switch tool and the work of ice-melt field connection simultaneously.
Description of drawings
Below in conjunction with the drawings and specific embodiments patent of the present invention is further described.
Fig. 1 is the ice-melting mode switch-interlocking condition and the control model switch-interlocking condition of embodiment of the present invention
Among Fig. 1:
The DC-isolation state: DC side isolation switch S1A, S1B, S1C, S2A, S2B, S2C all are in state separately;
In the DC-isolation process: refer to carry out the DC-isolation order and do not finish as yet;
Allow to switch: referring to give an order allows to carry out the ice-melting mode switching or carries out the ice-melt control mode to switch;
T: be to be set by the input value of " time-delay ", adjusting of this definite value needs to consider to avoid the time that signal disturbs, and generally is set at 10ms～30ms.
Fig. 2 is the phase sequence group switch-interlocking condition of patent working mode of the present invention
Among Fig. 2:
In the direct current lifting process: the direct current that refers to rectifying device output is in the process that increases or reduce;
In the phase sequence group handoff procedure: refer to that this group phase sequence group switching command has sent and carried out as yet end;
Allow the phase sequence group to switch: referring to give an order allows to switch to next group phase sequence group;
The direct current locking: implication is with the direct current locking of Fig. 1;
T: implication is with the t of Fig. 1.
The connection layout of Fig. 3 rectification and control device and alternating current circuit
Fig. 4 is the handoff procedure of embodiment of the present invention alternating current circuit three-phase conducting wire under the 1-1 ice-melting mode
Fig. 5 is the handoff procedure of embodiment of the present invention alternating current circuit three-phase conducting wire under the 1-2 ice-melting mode
S1A, S1B, S1C, S2A, S2B and S2C are the DC side isolation switch among Fig. 3, Fig. 4 and Fig. 5
Embodiment
DC de-icing device adopts controllable silicon (thyristor) rectifier system, and alternating current is converted into direct current, injects the three-phase alternating current lead, utilizes direct current to produce heat in conductor resistance icing is melted.The present invention can select to take first kind of ice-melting mode or second kind of ice-melting mode, by manual or automatic mode circuit switched phase sequence group, the operation automatic switchover three-phase conducting wire of control DC side disconnecting link is connected to rectifying device and carries out ice-melt, the three-phase conducting wire equilibrium is heated realizes balanced ice-melt, have good ice-melt effect.
Embodiment of the present invention comprises that ice-melting mode switches, control model is switched, the definition of phase sequence group and 4 aspects of phase sequence switch step.
1, ice-melting mode switches
Ice-melting mode is divided into ice-melting mode and second kind of ice-melting mode in first.The operations staff can manually switched between first kind of ice-melting mode and second kind of ice-melting mode on operations staff's work station (OWS), will satisfy ice-melting mode switch-interlocking condition shown in Figure 1 during switching.
1) first kind of ice-melting mode: at every turn two phase conductors to three-phase AC line carry out ice-melt, and one links to each other with the positive pole of deicing device direct voltage, and another negative pole with the deicing device direct voltage links to each other.
2) second kind of ice-melting mode: at every turn the three-phase conducting wire to three-phase AC line carries out ice-melt, and one links to each other with the positive pole of deicing device direct voltage, two-phase and connecing in addition, and the negative pole with the deicing device direct voltage links to each other again.
The total D.C. resistance of circuit is less under first kind of ice-melt working method, and the power of desired DC ice melting power supply is less relatively, and the total capacity of comparing with first kind of ice-melt working method reduces about 1/4.First kind of ice-melt working method can be selected as the ice-melt working method than long transmission line.
2, control model is switched
The ice-melt control model is divided into manual mode and automatic mode.The operations staff can be switched between manual mode and the automatic mode manually carrying out on operations staff's work station, will satisfy control model switch-interlocking condition as shown in Figure 1 during switching.
1) under the manual mode, after DC de-icing device is finished the alternating current circuit ice-melt of a certain phase sequence group, manually sends phase sequence group switching command by the operations staff.The DC ice melting control system realizes the grid switching operation of rise/stopping automatically of direct current and DC side isolation switch automatically, the lead of ice-melt is switched to the alternating current circuit ice-melt that next group continues another phase sequence group, each phase sequence ice-melt time by the operations staff according to circuit icing situation and meteorological condition enactment.
The step that direct current phase sequence group is switched rise/stops automatically with grid switching operation is identical for first kind of ice-melting mode with second kind of ice-melting mode, described in hereinafter phase sequence group switch step.
2) under the automatic mode, DC de-icing device carries out ice-melt T in the alternating current circuit to a certain phase sequence group
Z/ 3n will send phase sequence group switching command after the time automatically, realize direct current rise/stop automatically and DC side isolation switch grid switching operation after the alternating current circuit of next phase sequence group is carried out ice-melt T again
Z/ 3n the time, and then realize automatically direct current automatically rise/stop and DC side isolation switch grid switching operation after ice-melt T is carried out in the alternating current circuit of next phase sequence group
Z/ 3n the time, so continue, up to reaching T
ZTime stops after finishing ice-melt automatically.N is generally 1～3.(T
ZBe the total time of three-phase AC line ice-melt, by the operations staff according to circuit icing situation and meteorological condition enactment.)
3, phase sequence group definition
The phase sequence group of three-phase AC line can be defined as group 1, group 2 and group 3 three all ice-melt phase sequence groups.The operations staff can be switched group 1, group 2,3 three kinds of phase sequence groups of group on operations staff's work station successively, will satisfy phase sequence group switch-interlocking condition shown in Figure 2 during switching.
Under first kind of ice-melting mode and second kind of ice-melting mode, being defined as follows respectively of the phase sequence group of three-phase AC line:
1) under first kind of ice-melting mode,, can be divided into three kinds of phase sequence groups, that is: group 1:1A, 2B according to separate different with DC side isolation switch deciliter state of the line conductor that carries out ice-melt; Group 2:1B, 2C; Group 3:1C, 2A.
2) under second kind of ice-melting mode,, can be divided into three kinds of phase sequence groups, that is: group 1:1A, 2B, 2C according to separate different with DC side isolation switch deciliter state of the line conductor that carries out ice-melt; Group 2:1B, 2A, 2C; Group 3:1C, 2A, 2B.
4, phase sequence group switch step
When the phase sequence group of three-phase AC line was switched, according to ice-melt equipment running status difference, what the phase sequence group was switched rise/stopped can be divided into following three kinds of situations with the grid switching operation step automatically:
When 1) carrying out the phase sequence switching under the situation of deicing device DC-isolation and direct current locking, just the phase sequence pattern is switched to next group, deicing device is still preserved the DC-isolation state; Connect (direct current connects: refer to connect closed corresponding DC side isolation switch according to pre-set phase sequence group) order if carry out direct current again, direct current will connect by new phase sequence group setting, closed corresponding DC side isolation switch.
When 2) under the situation of connection of deicing device direct current and direct current locking, carrying out the phase sequence switching, the phase sequence pattern is switched to next group, control device and DC side disconnecting link are operated automatically, at first open the DC side isolation switch of original closure, require closed corresponding DC side isolation switch according to new phase sequence group again, be transformed into new direct current connection status.
When 3) carrying out the phase sequence switching under the situation of deicing device direct current release, control device will reduce deicing device at first automatically and output current to the minimum direct current that allows; Carry out the direct current locking again, locking ice-melt rectifying device; Automatically carry out the branch closing operation of DC side disconnecting link then, and enter the direct current connection status by new phase sequence group; And then automatically perform the direct current release, and promote the level before deicing device outputs current to switching, new phase sequence group circuit is carried out ice-melt.
Being connected as shown in Figure 3 of rectification and control device and alternating current circuit, under first kind of ice-melt working method the handoff procedure of alternating current circuit three-phase conducting wire as shown in Figure 4, the ice-melt total time T of three-phase line
ZBe about 1.5T.(T: the cycle time of uniline ice-melt, by the operations staff according to circuit icing situation and meteorological condition enactment.)。Under second kind of ice-melt working method the handoff procedure of alternating current circuit three-phase conducting wire as shown in Figure 5, the ice-melt total time T of three-phase line
ZBe about 2T (T: the cycle time of uniline ice-melt).
In order to verify the feasibility of embodiment of the present invention, utilize RTDS system and control protection test model machine to carry out emulation.Simulation result shows that embodiment of the present invention satisfies alternating current circuit ice-melt demand, can realize safety, ice-melt fast.Embodiment of the present invention was applied to " CHINA SOUTHERN POWER combat a natural disaster mitigation " engineering in 2008, come into operation in 11 transformer stations of southern four provinces, had obtained good effect.
Claims (5)
1, the method for DC ice melting three-phase AC line automatic switchover, it is characterized in that: the major loop of DC ice melting comprises rectifying device, control protective device and DC side disconnecting link, three-phase alternating-current supply is connected to the three-phase input that rectifying device is the valve group of converter, the both positive and negative polarity output of rectifying device is connected to the three-phase AC line that need carry out ice-melt by two groups of DC side isolation switchs respectively when the DC ice melting mode, form the DC ice melting major loop, three-phase AC line is carried out DC ice melting; According to ice-melt equipment running status difference, by the operation of control device and DC side isolation switch, control DC side isolation switch automatic switchover three-phase conducting wire makes it to be connected to rectifying device and carries out ice-melt.
2, the method that automaticallyes switch by the described DC ice melting three-phase AC line of claim 1, it is characterized in that: when the phase sequence group of three-phase AC line is switched, according to ice-melt equipment running status difference, rise/stop automatically and grid switching operation step that the phase sequence group is switched are one of following three kinds of situations:
When 1) carrying out the phase sequence switching under the situation of deicing device DC-isolation and direct current locking, just the phase sequence pattern is switched to next group, deicing device is still preserved the DC-isolation state; Must carry out the direct current bind command again, just can connect, closed corresponding DC side isolation switch by the phase sequence group setting of this group;
When 2) carrying out the phase sequence switching under the situation of connection of deicing device direct current and direct current locking, the phase sequence pattern is switched to next group, control device and DC side disconnecting link are operated automatically; At first open the DC side isolation switch of original closure, the phase sequence group according to this group requires closed corresponding DC side isolation switch again, is transformed into new direct current connection status;
When 3) carrying out the phase sequence switching under the situation of deicing device direct current release, control device will reduce deicing device at first automatically and output current to the minimum direct current that allows; Carry out the direct current locking again, locking ice-melt rectifying device; Automatically carry out the branch closing operation of DC side disconnecting link then, and enter the direct current connection status by the phase sequence group of next group; And then carry out the direct current release, and and promote deicing device and output current to level before switching, the phase sequence group circuit of this group is carried out ice-melt;
DC-isolation: refer to that two groups of DC side isolation switch S1A, S1B, S1C, S2A, S2B, S2C all are in state separately; The direct current locking: the deicing device control wave does not send, and silicon controlled rectifier is not started working; The direct current release: the deicing device control wave sends, and silicon controlled rectifier is started working; Direct current connects: refer to according to the predefined closed corresponding DC side isolation switch that is linked in sequence.
3, the method that automaticallyes switch by claim 1 or 2 described DC ice melting three-phase AC lines, it is characterized in that ice-melting mode have two kinds selective, be respectively: first ice-melting mode and second ice-melting mode:
1) first ice-melting mode: at every turn two phase conductors to three-phase AC line carry out ice-melt, and one links to each other with the positive pole of deicing device direct voltage, and another negative pole with the deicing device direct voltage links to each other;
2) second ice-melting mode: at every turn the three-phase conducting wire to three-phase AC line carries out ice-melt, and one links to each other with the positive pole of deicing device direct voltage, two-phase and connecing in addition, and the negative pole with the deicing device direct voltage links to each other again;
Two kinds of ice-melting modes will satisfy control model switch-interlocking condition shown in Figure 1 when switching: in not being in the DC-isolation process, three conditions of time-delay of DC-isolation state, direct current locking allow to switch when satisfying simultaneously;
Wherein, in the DC-isolation process: refer to carry out the DC-isolation order and do not finish as yet; DC-isolation state: refer to that two groups of DC side isolation switch S1A, S1B, S1C, S2A, S2B, S2C all are in state separately.
4, the method that automaticallyes switch by claim 1 or 2 described DC ice melting three-phase AC lines, it is characterized in that: the ice-melt control model is divided into manual mode and automatic mode:
1) under the manual mode, after DC de-icing device is finished the alternating current circuit ice-melt of a certain phase sequence group, manually sends phase sequence group switching command by the operations staff; The DC ice melting control system realizes the grid switching operation of rise/stopping automatically of direct current and DC side isolation switch automatically, the lead of ice-melt is switched to the alternating current circuit ice-melt of next another phase sequence group of group continuation;
2) under the automatic mode, DC de-icing device carries out ice-melt T in the alternating current circuit to a certain phase sequence group
Z/ 3n will send phase sequence group switching command after the time automatically, realize direct current rise/stop automatically and DC side isolation switch grid switching operation after the alternating current circuit of next phase sequence group is carried out ice-melt T again
Z/ 3n the time, and then realize automatically direct current automatically rise/stop and DC side isolation switch grid switching operation after ice-melt T is carried out in the alternating current circuit of next phase sequence group
Z/ 3n the time, so continue, up to reaching T
ZTime stops after finishing ice-melt automatically.
Two kinds of control models will satisfy control model switch-interlocking condition shown in Figure 1 when switching: in not being in the DC-isolation process, three conditions of time-delay of DC-isolation state, direct current locking allow to switch when satisfying simultaneously.
5, the method that is automaticallyed switch by claim 1 or 2 described DC ice melting three-phase AC lines is characterized in that: need satisfy phase sequence group switch-interlocking condition as shown in Figure 2 when the phase sequence group is switched successively: in not being in the direct current lifting process, be not in the phase sequence group handoff procedure, three conditions of time-delay of direct current locking allow the phase sequence group to switch when satisfying simultaneously.In the phase sequence group handoff procedure: refer to that this group phase sequence group switching command has sent and carried out as yet end.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102684129A (en) * | 2012-06-01 | 2012-09-19 | 湖南省电力公司科学研究院 | Ice melting system capable of switching AC between DC |
| CN103280757A (en) * | 2013-06-20 | 2013-09-04 | 国家电网公司 | Direct-current deicing output electric switching device |
| CN103457221A (en) * | 2012-05-28 | 2013-12-18 | 南京南瑞继保电气有限公司 | Method for configuring structure transformation of double 6-pulse thyristor converter valve groups |
| CN103500974A (en) * | 2013-10-17 | 2014-01-08 | 国家电网公司 | Output switchover system for DC (direct current)-based deicing device |
| CN104577926A (en) * | 2015-01-08 | 2015-04-29 | 国家电网公司 | Test platform capable of achieving wire and ground wire combined DC-based deicing |
| CN113131428A (en) * | 2021-05-14 | 2021-07-16 | 南方电网科学研究院有限责任公司 | Variable-frequency controllable current source ice melting device |
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2009
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| CN103457221A (en) * | 2012-05-28 | 2013-12-18 | 南京南瑞继保电气有限公司 | Method for configuring structure transformation of double 6-pulse thyristor converter valve groups |
| CN103457221B (en) * | 2012-05-28 | 2016-03-02 | 南京南瑞继保电气有限公司 | A kind of Structural Transformation collocation method of two 6 pulsation thyristor valves groups |
| CN102684129A (en) * | 2012-06-01 | 2012-09-19 | 湖南省电力公司科学研究院 | Ice melting system capable of switching AC between DC |
| CN103280757A (en) * | 2013-06-20 | 2013-09-04 | 国家电网公司 | Direct-current deicing output electric switching device |
| CN103500974A (en) * | 2013-10-17 | 2014-01-08 | 国家电网公司 | Output switchover system for DC (direct current)-based deicing device |
| CN104577926A (en) * | 2015-01-08 | 2015-04-29 | 国家电网公司 | Test platform capable of achieving wire and ground wire combined DC-based deicing |
| CN104577926B (en) * | 2015-01-08 | 2016-11-16 | 国家电网公司 | The test platform of wire ground wire combination DC ice melting can be realized |
| CN113131428A (en) * | 2021-05-14 | 2021-07-16 | 南方电网科学研究院有限责任公司 | Variable-frequency controllable current source ice melting device |
| WO2022237023A1 (en) * | 2021-05-14 | 2022-11-17 | 南方电网科学研究院有限责任公司 | Variable-frequency controllable current source ice melting apparatus |
| CN113131428B (en) * | 2021-05-14 | 2023-02-28 | 南方电网科学研究院有限责任公司 | Variable-frequency controllable current source ice melting device |
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