CN101540491A - Setting method of DC de-icing major loop - Google Patents

Setting method of DC de-icing major loop Download PDF

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Publication number
CN101540491A
CN101540491A CN200910025721A CN200910025721A CN101540491A CN 101540491 A CN101540491 A CN 101540491A CN 200910025721 A CN200910025721 A CN 200910025721A CN 200910025721 A CN200910025721 A CN 200910025721A CN 101540491 A CN101540491 A CN 101540491A
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China
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phase
reactor
ice
disconnecting link
major loop
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CN200910025721A
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Chinese (zh)
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CN101540491B (en
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傅闯
田杰
康鹏
陈赤汉
晁剑
陈松林
赵杰
赵立进
张迅
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南方电网技术研究中心
南京南瑞继保电气有限公司
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Priority to CN2009100257217A priority Critical patent/CN101540491B/en
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Abstract

The invention relates to a setting method of a DC de-icing major loop, which comprises a three-phase three-winding rectiformer, a 12-pulsating rectifier device, a control protecting device, an automatic switching device and a DC side disconnecting link, wherein the link group of the three-phase three-winding rectiformer adopts D/d 0/y11 or Y/y 0/d11 link, two low-voltage side windings of the three-phase three-winding rectiformer misalign 30 degrees, two groups of low-voltage side three-phase outputs of the three-phase three-winding rectiformer are respectively connected to three-phase inputs of two valve groups of the 12-pulsating rectifier device, i.e. a converter; the anode output and the cathode output of the 12-pulsating rectifier device are respectively connected to a three-phase AC line needing to be de-iced through DC side switches when in a DC de-icing mode so as to form the DC de-icing major loop for performing the DC de-icing of the three-phase AC line. The invention has the functions of balancing the de-icing and operating at large-current for a long time, and can safely, conveniently and quickly de-ice; and DC de-icing once-expansion equipment can integrate the function of reactive power compensation.

Description

The major loop method to set up of DC ice melting
Technical field
The present invention relates to the major loop method to set up of DC ice melting, relate in particular to the ice-melt and the setting of reactive power compensation major loop that are applicable to high pressure and extra-high voltage grid transmission line.
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.
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.
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.
After the North America ice storm disaster in 1998, Hydro-Quebec has considered various line ice-melting measures.Huge by the investment that the way of strengthening rack is brought, and the ac short circuit ice-melt can not solve the circuit icing problem of 200km scope.So, finally selected to cooperate with AREVA company, drop into 2,500 ten thousand Euros and developed a cover high voltage direct current deicing device, 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.
Propose DC de-icing device both at home and abroad at present, do not see the technical scheme that adopts the present invention to propose.Apply for a patent in AREVA company scheme and China Electric Power Research Institute and to adopt main electrical scheme reconstruct mode to realize ice-melt and SVC function, equipment and wiring complexity in 200810223583.9; It is simple not possess this programme wiring, very little to the harmonic effects of system, needn't dispose advantages such as bank of filters.
In the Areva scheme (please refer to document [1] and [2]): in list of references [2], provide, DC de-icing device is when the ice-melt working method, press winding (43kV) to pass through the mode that commutating reactor (connecting two 6 pulse conversion devices respectively, totally two groups of each 3 reactors) connects two 6 pulse conversion devices respectively simultaneously in one of AC side employing three-winding transformer; DC side adopts the mode of the output of two 6 pulse conversion devices by the equalizing reactor parallel connection.
When dynamic passive compensation (SVC) working method, AC side needs one group of 3 commutating reactor is changed a low pressure winding (20kV) that is wired to three-winding transformer, be connected to one 6 pulse conversion device, and only use this 6 pulse conversion device mid portion thyristor valve; This 6 pulse conversion device thyristor valve positive and negative and connect after be connected to another the group 3 commutating reactors.This mode is TCR (the thyristor-controlled reactor type static reactive) wiring that typical triangle connects.
List of references:
[1]Granger?M,Dutil?A,Nantel?A.Performance?aspects?of?Levis?substation?de-icingproject?using?DC?technology[C].Presented?at?the?11th?Int.Workshop?on?AtmosphericIcing?of?Structures.Montreal,Canada,June?2005.
[2]Horwill?C,Davidson?C?C,Granger?M,et?al.An?application?of?HVDC?to?the?de-icing?oftransmission?lines.Transmission?and?Distribution?Conference?and?Exhibition[c].2005/2006IEEE?PES?Dallas,USA.
Summary of the invention
Purpose of the present invention: the major loop method to set up that proposes DC ice melting, be applicable to the ice-melt of high pressure and extra-high voltage grid transmission line, a small amount of primary equipment by expansion DC ice melting loop, realization is with the miscellaneous function of idle controlled function as DC de-icing device, the function of the lagging reactive power of circuit needs is provided, carries out dynamic passive compensation.
Technical scheme of the present invention is:
The main loop design method of DC ice melting, comprise three-phase three winding rectifier transformers, 12 pulsation rectifying devices, the control protective device, automatic switching control equipment and DC side disconnecting link, the wiring group of three-phase three winding rectifier transformers adopts D/d0/y11 or Y/y0/d11 wiring, two low-pressure side windings phase shift, 30 degree of three-phase three winding rectifier transformers, it is characterized in that: the three-phase output of 2 groups of low-pressure sides of three-phase three winding rectifier transformers is connected respectively to the three-phase input of 2 valve groups of 12 pulsation rectifying devices, the both positive and negative polarity output of 12 pulsation rectifying devices is connected to the three-phase AC line that need carry out ice-melt by the DC side switch respectively when the DC ice melting mode, form DC ice melting major loop (as shown in Figure 2), can carry out DC ice melting three-phase AC line; Expand primary equipment in the reactive power compensation mode and can form DC ice melting major loop (as Fig. 4, shown in Figure 5) respectively.
Wherein, as shown in Figure 3, increase by first group of reactor and change over switch disconnecting link, every 1 reactor L that contacts mutually between rectifier transformer and rectifying device TCR, every reactor both sides and can increase filter to change over switch disconnecting link parallel connection (as shown in Figure 3) as required.
Wherein, as shown in Figure 4, closed change over switch disconnecting link reactor L in parallel TCRBypass (being short circuit), then major loop enters the ice melting operation state; Open change over switch disconnecting link in parallel with reactor L TCRBe connected to converter, short circuit between the neutral point bus between the positive and negative electrode busbar of DC de-icing device and two the valve groups, then major loop enters the reactive power compensation running status again, as the controlled reactor operation of the Y-connection of thyristor control.
Wherein, as shown in Figure 5, other is provided with second group of reactor and change over switch disconnecting link, an every reactor both sides and a change over switch disconnecting link parallel connection, and increasing connecting line in the DC side of two valve groups of converter and AC side, an every reactor both sides and a change over switch disconnecting link series connection are on connecting line, respectively according to " DC side A join AC side B ", " DC side B meets AC side C " is connected with the mode of " DC side C meets AC side A ", opens the change over switch disconnecting link with reactor L TCRBe connected to converter, then major loop enters the reactive power compensation running status, the controlled reactor operation that the triangle of controlling as thyristor connects.
Because rectifier transformer adopts D/d0/y11 or Y/y0/d11 wiring, two winding phase shifts of secondary, 30 degree; The ice-melt rectifying device adopts the 12 pulsation modes of connection, and is very little to the harmonic wave and the idle influence of system during the deicing device operation.With the 60MW fixed DC deicing device that is used for the ice-melt of 500kV alternating current circuit is example, the total capacity meritorious, idle and filtering that needs during its DC ice melting operation is about 75MVA, usually less than 1/3 of the 500kV of transformer station main transformer 35kV side capacity, very little to systematic influence; The harmonic wave that produces during the DC de-icing device operation is 12k ± 1 subharmonic, and k is 1,2,3 ..., i.e. the harmonic wave that produces during deicing device operation mainly is 11,13 inferior characteristic harmonics.The harmonic wave that produces during the deicing device operation is very little to systematic influence, and to the not influence of stable operation of deicing device itself, but the 35kV side slightly surpasses the concerned countries standard, can install alternating current filter equipment during ice melting operation; Voltage harmonic distortion effects to 500kV side and 220kV side is very little, satisfies the concerned countries standard.
The ice-melt rectifying device to the ice-melting mode that three-phase line adopts is: circuit out of service, automatic switching control equipment by two-phase/three-phase, be connected to rectifying device by the control device three-phase line that automaticallyes switch, guarantee the balanced ice-melt of three-phase line, the operation of rectifying device and switch is all controlled by automatic sequence and is realized in the handoff procedure.The characteristics of this ice-melting mode are the equilibriums of three-phase line ice-melt degree, can not produce the Tension Difference of three-phase conducting wire and shaft tower is impacted.This technology specifically can be with reference in another application " method that DC ice melting three-phase AC line automaticallyes switch " that proposes simultaneously.
Beneficial effect of the present invention: deicing device is with the SVC function, and by the expansion primary equipment, deicing device can doublely be done Static Type Dynamic Reactive Compensation Device when not bearing the ice-melt function, carry out dynamic passive compensation, makes full use of customer investment; The coincidence circuit wiring is simple, solves the problem that day-to-day operation is safeguarded effectively.Also different with the AREVA technical scheme, AREVA technical scheme employing equipment is more, wiring is complicated, and when carrying out the conversion of DC ice melting and reactive power compensation (SVC) working method, reconfiguration line workload is very big; And all must the configuration alternating current filter during DC ice melting and reactive power compensation (SVC) work.
Description of drawings
Below in conjunction with the drawings and specific embodiments patent of the present invention is further described.
Fig. 1 is the system principle winding diagram of band rectifier transformer 12 pulsation ice-melt rectifying devices
Fig. 2 is the major loop figure of the ice-melt function of embodiment of the present invention one-simple conduct
Fig. 3 is an embodiment of the present invention two-as the major loop figure of ice-melt function
Fig. 4 is the major loop figure of controlled reactor of the thyristor control of embodiment of the present invention three-double as Y-connection
Fig. 5 is the major loop figure of the controlled reactor of the thyristor control that connects of embodiment of the present invention four-double as triangle
Among Fig. 2~Fig. 5: S1a-1, S1b-1, S1c-1, S2a-1, S2b-1, S2c-1 are respectively the change over switch disconnecting link that the rectifying device AC side increases configuration; S1a-2, S1b-2, S1c-2, S2a-2, S2b-2, S2c-2 are respectively the change over switch disconnecting link that the rectifying device DC side increases configuration; S1a, S1b, S1, S2a, S2b, S2c are respectively original DC side switch tool; L TCRFor increasing the reactor of configuration.
Embodiment
The present invention is with the miscellaneous function of idle controlled function as DC de-icing device, and the expansion primary equipment can be taken into account the controlled reactor function.Basic skills is, increases equipment such as reactor, switch in the primary equipment of deicing device, and the function of corresponding reactive power compensation is set in control protection system system.And mix corresponding filter according to the situation of harmonic wave on the ac bus, make DC de-icing device become Static Var Compensator (SVC).
Deicing device is as equipment more special in the electric power system, and its ice-melt function only just needs operation under the situation of circuit icing in the winter time, and may only move limited fate every year; Use it for Static Var Compensator in all the other times, the function of the lagging reactive power of circuit needs can be provided, also can solve the problem of operation maintenance effectively simultaneously, make full use of customer investment.
Be used for 500kV alternating current circuit fixed DC deicing device and be used for 220kV, 110kV alternating current circuit and insert 35kV system of transformer station the movable DC deicing device power supply can by cable or the pipe bus directly draw side from the 500kV of transformer station main transformer 35kV, connect rectifying device through rectifier transformer, its principle wiring as shown in Figure 1.
The specific embodiment of the present invention has following four kinds, can select according to system situation:
1, embodiment one
Comprise and adopt D/d0/y11 or Y/y0/d11 wiring; the three-phase three winding rectifier transformers of two winding phase shifts of secondary, 30 degree; 12 pulsation rectifying devices; the control protective device; automatic switching control equipment and DC side disconnecting link; it is characterized in that: the three-phase output of 2 groups of low-pressure sides of three-phase three winding rectifier transformers is connected respectively to the three-phase input of 2 valve groups of 12 pulsation rectifying devices; the both positive and negative polarity output of 12 pulsation rectifying devices is connected to the three-phase AC line that need carry out ice-melt by the DC side switch respectively when the DC ice melting mode; form DC ice melting major loop (as shown in Figure 2), can carry out DC ice melting three-phase AC line.
Adopt band rectifier transformer 12 pulsation ice-melt rectifying devices, can be at dissimilar and circuit length, design alternative rectifier transformer output voltage is beneficial to the selection of rectifier working point; Deicing device is regulated by the rectifier trigger angle, and the ice melting current and the direct voltage that need are provided, and adaptability is better; And rectifier transformer provides the isolation of ac/dc, satisfies the requirement of restriction thyristor valve short circuit current under the failure condition.
Rectifier transformer adopts D/d0/y11 or Y/y0/d11 wiring, two winding phase shifts of secondary, 30 degree; The ice-melt rectifying device adopts the 12 pulsation modes of connection, and is very little to the harmonic wave and the idle influence of system during the deicing device operation.With the 60MW fixed DC deicing device that is used for the ice-melt of 500kV alternating current circuit is example, the total capacity meritorious, idle and filtering that needs during its DC ice melting operation is about 75MVA, usually less than 1/3 of the 500kV of transformer station main transformer 35kV side capacity, very little to systematic influence; The harmonic wave that produces during the DC de-icing device operation is 12k ± 1 subharmonic, and k is 1,2,3 ..., i.e. the harmonic wave that produces during deicing device operation mainly is 11,13 inferior characteristic harmonics.The harmonic wave that produces during the deicing device operation is very little to systematic influence, and to the not influence of stable operation of deicing device itself, but the 35kV side slightly surpasses the concerned countries standard, can install alternating current filter equipment during ice melting operation; Voltage harmonic distortion effects to 500kV side and 220kV side is very little, satisfies the concerned countries standard.
2, embodiment two and embodiment three
On the basis of embodiment one main electrical scheme, need be between converter transformer and deicing device every mutually in 1 reactor of polyphone, every both sides, reactor loop and one are in parallel the change over switch disconnecting link, need 6 reactors and 6 the change over switch disconnecting link altogether, can dispose several filters as required.The change over switch disconnecting link that increases configuration in AC side needs to require to be configured according to power system security.
Deicing device converter DC side short circuit, AC side utilize the change over switch disconnecting link to switch controlled reactor (TCR) operation of wiring connection reactor as the Y-connection of thuristor throw-in and throw-off.The equipment that two secondary windings of rectifier transformer connect as shown in Figure 3.Converter becomes the operational mode of two antiparallel thyristor valve groups of every phase under this pattern, to reactor L TCRCarry out switching or continuous control.When adopting switching control mode (switching control: thyristor is according to full conducting or not conduction mode work), advantage is not have harmonic problem, and loss is less, the idle adjusting that can fix.When adopting continuous control mode (continuous control: thyristor is according to the trigger angle continuous control), deicing device possesses continuous idle regulating power as the TCR operation of Y-connection.
When carrying out ice-melt: closed rectifying transformer alternating side change over switch disconnecting link is with reactor L TCRLoop bypass (being short circuit) is embodiment two, as shown in Figure 3.
When carrying out reactive power compensation: open the change over switch disconnecting link with reactor L TCRBe connected to converter,, be embodiment three, as shown in Figure 4 short circuit between the neutral point bus between the positive and negative electrode busbar of DC de-icing device and two the valve groups.
3 reactors of respectively going here and there on two valve groups can make the operation of two valve groups of deicing device balance, and the reactive compensation capacity of AC system is doubled.The reactor parameter is determined jointly by the capacity of the perceptual idle amount, main transformer capacity and the deicing device that need deicing device to absorb in the station.
When DC de-icing device is transformed into the operation of silent oscillation dynamic passive compensation (SVC) device, only need be by opening the change over switch disconnecting link, and short circuit between the neutral point bus between the positive and negative electrode busbar of DC de-icing device and two the valve groups can be realized that the other parts of DC de-icing device primary equipment do not need to do any change.This conversion regime makes the field operator to simple, the easy row of the operation and maintenance of deicing device.The risk that bigger variation causes takes place in the topological structure that also greatly reduces owing to primary system.
3, embodiment four
On the basis of embodiment one main electrical scheme, need be between converter transformer and deicing device every mutually in 1 reactor of polyphone, every both sides, reactor loop and one are in parallel the change over switch disconnecting link, amounting to needs 6 reactors and 6 the change over switch disconnecting link, can dispose as required and do a filter.The DC side and the AC side of two valve groups of rectifier need increase line, according to " DC side A phase-AC side B ", " DC side B-AC side C ", the mode of " DC side C-AC side A " is carried out wiring (as shown in Figure 5).The change over switch disconnecting link that increases configuration in AC side needs to require to be configured according to power system security.
The converter DC side is by the change over switch disconnecting link reconfiguration line of deicing device, and AC side is utilized the change over switch disconnecting link to switch wiring and is connected to the controlled reactor operation (TCR) of three-phase/six reactor as the triangle connection of thyristor control.The equipment that each secondary winding of rectifier transformer connects as shown in Figure 5.Converter bridge becomes the operational mode of two antiparallel thyristor valve groups of every phase under this pattern, to reactor L TCRCarry out continuous control.
Scheme is consistent with the TCR mode of connection of common silent oscillation dynamic passive compensation among Fig. 5, promptly adopts the triangle mode.Under TCR ruuning situation, device possesses continuous idle regulating power.
When 4, moving as reactive power compensator to the influence and the compensation effect of system
When DC de-icing device moves, can provide lagging reactive power to AC system under the SVC ice-melting mode; And the size of reactive power can be rapidly, continuously adjusting.When DC de-icing device moves as SVC in a manner described, very little to the harmonic effects of system, do not need to dispose the percent harmonic distortion that bank of filters also can guarantee the 35kV busbar voltage and satisfy relevant national standard.Therefore, when DC de-icing device was done the SVC operation, other load did not need to withdraw from the 35kV bus, can normally move.If can dispose on the 35kV bus 11,13 times and high pass filter group or capacitor group, when deicing device is in the SVC mode operation so, cooperate with deicing device by bank of filters or capacitor group, can also improve the reactive power of perception or capacitive to AC system, realize two-way idle adjusting; And the size of compensating power equally can be adjustable rapidly, continuously.Can effectively suppress of the fluctuation of 35kV busbar voltage amplitude at positive and negative both direction.
5, l-G simulation test checking and practical situations
The l-G simulation test checking of DC de-icing device no-power compensation function:
In order to verify feasibility 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 can effectively satisfy alternating current circuit ice-melt demand; Deicing device can the double SVC of being when not bearing the ice-melt function, carries out dynamic passive compensation.
The field test checking of DC de-icing device:
On September 5th, 2008, movable DC deicing device model machine field test is operated in the Guizhou electrical network and all spares 500kV Fuquan transformer station and complete successfully between 25MW station, test circuit is all lines of 220kV good fortune, long 57 kilometers of circuit, maximum ice-melt test current reaches 2000A, each equipment operation of test circuit, gold utensil, joint and DC de-icing device is normal in the process of the test, and 220kV good fortune all line temperature rise reaches 25 degrees centigrade.
On October 12nd, 2008,60MW fixed DC deicing device model machine field test is operated in the Guizhou electrical network and all spares 500kV Fuquan transformer station and complete successfully, test circuit is executed the II line for the 500kV good fortune, long 93 kilometers of circuit, maximum ice-melt test current reaches 4000A, each equipment operation of test circuit, gold utensil, joint and DC de-icing device is normal in the process of the test, and the 500kV good fortune is executed the temperature rise of II line and reached 35 degrees centigrade.

Claims (3)

1; the major loop method to set up of DC ice melting; comprise three-phase three winding rectifier transformers; 12 pulsation rectifying devices; the control protective device; automatic switching control equipment and DC side disconnecting link; the wiring group of three-phase three winding rectifier transformers adopts D/d0/y11 or Y/y0/d11 wiring; two low-pressure side windings phase shift, 30 degree of three-phase three winding rectifier transformers; it is characterized in that: the three-phase output of two groups of group low-pressure sides of three-phase three winding rectifier transformers is connected respectively to the three-phase input that 12 pulsation rectifying devices are two valve groups of converter; the both positive and negative polarity output of 12 pulsation rectifying devices is connected to the three-phase AC line that need carry out ice-melt by the DC side switch respectively when the DC ice melting mode; form the DC ice melting major loop, three-phase AC line is carried out DC ice melting.
2, the major loop method to set up of DC ice melting as claimed in claim 1 is characterized in that being provided with in addition first group of reactor and change over switch disconnecting link, three-phase three winding rectifier transformers and 12 the pulsation rectifying devices between every 1 reactor L that contacts mutually TCR, every reactor two ends are in parallel with a change over switch disconnecting link; Closed change over switch disconnecting link in parallel, i.e. reactor L TCRBypass, then the DC ice melting major loop enters the ice melting operation state; Open change over switch disconnecting link in parallel with reactor L TCRBe connected to converter, short circuit between the neutral point bus between the positive and negative electrode busbar of DC ice melting major loop and two the valve groups, then the DC ice melting major loop enters the reactive power compensation running status again, as the controlled reactor operation of the Y-connection of thyristor control.
3, the major loop method to set up of DC ice melting as claimed in claim 1, it is characterized in that being provided with in addition second group of reactor and change over switch disconnecting link, an every reactor two ends and a change over switch disconnecting link parallel connection, and increase connecting line in the DC side of two valve groups of converter and AC side, an every reactor two ends and a change over switch disconnecting link series connection are on described connecting line, according to " DC side A join AC side B ", " DC side B meets AC side C " is connected with the mode of " DC side C meets AC side A " respectively; Open the change over switch disconnecting link with reactor L TCRBe connected to converter, then major loop enters the reactive power compensation running status, the controlled reactor operation that the triangle of controlling as thyristor connects.
CN2009100257217A 2009-03-06 2009-03-06 Setting method of DC de-icing major loop CN101540491B (en)

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CN102195260A (en) * 2011-05-29 2011-09-21 西南交通大学 Power-frequency online anti-icing de-icing method for electrified railway contact network
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CN103078287A (en) * 2013-01-29 2013-05-01 梁一桥 Direct-current high-current ice-melting device with STATCOM function
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CN103633864A (en) * 2013-11-19 2014-03-12 国家电网公司 Controllable commutation inductor-based commutation device and implementation method thereof
WO2015074304A1 (en) * 2013-11-19 2015-05-28 国家电网公司 Commutation apparatus based on controllable commutation inductor, and implementation method therefor
EP3073598A4 (en) * 2013-11-19 2017-08-02 State Grid Corporation of China Commutation apparatus based on controllable commutation inductor, and implementation method therefor
CN103715643A (en) * 2013-12-27 2014-04-09 北京四方继保自动化股份有限公司 Container type DC deicing system and control method
CN103715643B (en) * 2013-12-27 2016-08-17 贵州电网公司电网规划研究中心 A kind of container type DC deicing system and control method
CN107181263A (en) * 2016-12-12 2017-09-19 南京南瑞继保电气有限公司 The DC ice melting of zero load test and SVC major loop and method to set up can be achieved
CN106936303A (en) * 2017-04-25 2017-07-07 西安许继电力电子技术有限公司 A kind of bridge arm circuit and method for suppressing Large Copacity MMC sub-module fault electric currents
CN106936303B (en) * 2017-04-25 2020-01-17 西安许继电力电子技术有限公司 Bridge arm circuit and method for inhibiting fault current of large-capacity MMC sub-module
CN107196262A (en) * 2017-07-21 2017-09-22 国网湖南省电力公司 Wind power plant intensive style DC de-icing device topological structure

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