CN201515226U

CN201515226U - Device for increasing network voltage at tail end of long power supply arm for heavy haul railway

Info

Publication number: CN201515226U
Application number: CN200920065881XU
Authority: CN
Inventors: 王卫安; 张定华; 谭胜武; 马雅青; 周方圆; 黄燕艳; 杨磊; 张斌; 胡前; 王小方; 李军; 邓建华
Original assignee: Zhuzhou National Engineering Research Center of Converters Co Ltd
Current assignee: Zhuzhou National Engineering Research Center of Converters Co Ltd
Priority date: 2009-09-14
Filing date: 2009-09-14
Publication date: 2010-06-23
Anticipated expiration: 2019-09-14

Abstract

A device for increasing network voltage at the tail end of a long power supply arm for a heavy haul railway is characterized in that a direct hanging type TCR mode SVC (static var compensator) is mounted at the wire outlet end of an SCOTT main transformer; and a plurality of groups of voltage reducing type TSCs are mounted at an autotransformer end at the tail end of the long power supply arm; therefore, the network voltage of the tail is improved through adopting the grouped voltage reducing type TSCs to compensate the tail end of the power supply end. An SCOTT transformer is arranged in an AT power supply system of the heavy haul railway and comprises a T seat wire outlet end and an M seat wire outlet end; a set of SVC device consisting of a TCR branch circuit and two capacitance branch circuits (FC1 and FC2) is mounted at the T seat and M seat wire outlet ends of the SCOTT transformer, wherein, the FC1 and the FC2 are identical, thereby ensuring that the whole SVC can be compensated in a derated manner when the whole set is repaired; meanwhile, a voltage reduction TSC group is mounted on the uplink and comprises a triple and a quintuple filter branches, wherein, the uplink adopts over loading grade climbing line, and the downlink adopts a downgrading line.

Description

A kind of supply voltage at tail end of long supply arm of heavy haul railway improves device

Technical field

The utility model relates to a kind of electric power mode of movement and device, refers in particular to a kind of supply voltage at tail end of long supply arm of heavy haul railway and improves device, and international Patent classificating number is B61F05/02, is mainly used in the heavily loaded track traffic electrical power trans mission/distribution system.

Background technology

Along with the high speed development of Chinese national economy, railway transport capacity is constantly proposed higher requirement, also make the sustainable growth of electric railway traction load.Many circuits, traction net voltage levvl is low excessively under the heavy load conditions, influences the normal running under power of train, has limited freight volume and has further increased.

In the traction net, autotransformer in parallel forms the AT supply power mode, and other supply power modes have voltage, power loss less relatively, the characteristics that power supply distance is longer, therefore China's heavy-loaded line much locates to have adopted this supply power mode, as the Qun Dynasty, the refreshing north line of China's transferring coal from the west to the east.But along with the sharp increase day by day of freight volume, cause rate of traffic flow and bicycle power to increase, this makes the loss of voltage of long supply arm increase greatly, and the end that appears at long supply arm has been lower than locomotive operation minimum voltage 19KV and the parking phenomenon that causes.By the analysis that the reason that long supply arm terminal voltage is fallen is carried out, drawing and causing loss of voltage main cause is that the voltage drop of reactive power electric current on induction reactance causes.And this voltage drop can be divided into physically: the loss of the voltage of reactive current in system impedance and the impedance of transforming plant main transformer depressor, be called for short system voltage loss and reactive current at the contact line loss of voltage.

At present, solving the low excessively way of traction net voltage levvl has the system short circuit capacity that increases the traction substation inlet wire and changes jumbo traction transformer, but this does not fundamentally solve the loss of voltage, and relates to and the cooperatively interacting and the replacing of main transformer of electric power system, and cost is big.And consider that by find a kind of scientific and reasonable pressure regulation strategy from tractive power supply system inside solving net, to press low problem be a kind of scheme little, instant effect of investing, and can take into account compensation power factor and negative-sequence current when regulation voltage can be implemented in.Therefore proposition at present is more and more to the method that traction substation carries out reactive power compensation, but its main purpose is to improve more than the power factor to 0.9, to avoid the fine of electric power system.Typically have at the leading-out terminal installation FC of transformer or the mode of SVC and improve the net pressure.Following paper is the scheme close with this programme:

1. " analysis of causes that traction power supply arm terminal voltage is on the low side and solution " mainly is to analyze at the loss of voltage of contact line, and the method for " in order fundamentally to solve supply arm terminal voltage problem on the low side, it will be argued that the most basic way should work hard from the contact line structure and material " proposed.

2. " discussion of Yicheng AT traction substation dynamic passive compensation with put into practice " is at heavily loaded electric railway AT power supply traction substation power factor problem not up to standard, proposed the traction transformer leading-out terminal and magnetic valve type controllable reactor has been installed, reached the purpose that improves power factor to regulate reactive power.

3. after " Qun Dynasty line Yanqing-following village supply arm voltage solution on the low side " increases at Qun Dynasty's electric railway freight volume, Yanqing-following village supply arm voltage problem on the low side, proposed transformation Yanqing-following village contact net equipment, descended village subregion booth to set up the comprehensive reformation scheme of booster transformer and dynamic capacitance compensation device in one's power, to improve Yanqing-following village supply arm voltage problem on the low side in the Yanqing power transformation.Wherein the dynamic capacitance compensation device is a multiple unit capacitor machinery grouping switching (MSC).

4. " based on the thyristor control traction net automatic voltage regulator design of DSP " is a kind of of transformer pressure regulation, the same with the principle of main transformer tap No-load changer, on-load tap-changing transformer, but be to utilize transistor controlling series transformer type (TCST) traction net voltage regulator, in the hope of reaching better voltage regulation result.

Press in order to improve the terminal net of supply arm, 1.～4. above-mentioned paper has carried out correlative study, and wherein 1. paper mainly is will analyze the voltage that contact line impedance, reactance cause, proposition be the method for transforming the contact line structure and material.This method is to reduce the loss of voltage of contact line by the impedance that reduces contact line, but this can not eliminate the loss of voltage that reactive current causes, and more do not consider the loss of voltage of transformer and system impedance, and this is the major part of the loss of voltage.2. paper is to be the reactive power compensation of target with the compensation power factor, its compensation arrangement is installed in the transformer leading-out terminal, in the time of the compensation power factor net is pressed with improvement, and the loss of voltage of contact line is not compensated comprehensively, so the improvement effect that the end net of supply arm is pressed is limited.Its used compensation arrangement is a magnetic valve type controllable reactor simultaneously, and its response time is slow, and is not obvious to the compensation effect of voltage at the locomotive mutation time.Paper 3. analysis meter has been calculated Qun Dynasty line Yanqing～following village supply arm voltage reason on the low side, has proposed to cause contact line, sets up booster transformer and has set up multiple unit capacitor machinery grouping switching (MSC) device at the supply arm end.This mode is mainly considered to transform from power supply unit, though proposed to carry out endways the scheme of capacitance compensation, it adopts the method for mechanical grouping switching capacitor, can not real-Time Compensation, and the compensation effect of voltage is poor.4. paper has been analyzed the supply arm net and has been forced down the problem of bringing, mode based on the thyristor control traction net automatic voltage regulator of DSP has been proposed, but its essence is to regulate its outlet voltage by the no-load voltage ratio of regulating transformer, and does not consider from the essence of the loss of voltage.

Therefore the terminal net of existing supply arm is pressed all not compensation of the consideration loss of voltage comprehensively of improvement method, necessary this is improved.

The utility model content

This patent utility model problem to be solved is: at the deficiency of the loss of voltage improvement method that has supply voltage at tail end of long supply arm of heavy haul railway AT supply power mode now, propose a kind of can be effectively in heavy haul railway AT electric power system comprehensively compensating, improve the device that the terminal net of supply arm is pressed the reactive power electric current that causes the net crushing to lose.

The purpose of this utility model is achieved through the following technical solutions: improve the device that the terminal net of supply arm is pressed in a kind of heavy haul railway AT electric power system: the leading-out terminal at the main transformer of heavy haul railway AT electric power system is equipped with by TCR branch road and two SVC devices that capacitive branch is formed, and two capacitive branch are identical, with guarantee when maintenance cover whole SVC can the derate compensation to avoid the uncompensated electric voltage dropping that causes.At uplink step-down TSC group is housed simultaneously, is made as filter branch respectively 3,5 times.Wherein uplink is a heavy duty climbing line, and downlink is the descending line, therefore can reduce the electric current that flows through AT, good wave filtering effect in the uplink compensation.

The invention has the advantages that:

1, proposed with at transformer leading-out terminal and supply arm end with TCR﹠amp; The long supply arm net of heavy haul railway that FC and many group TSC combine is pressed the raising method.

2, be the highest direct hanging type SVC of present electric pressure based on direct hanging type TCR type SVC structure, wherein the compensation capacity of Zui Da TCR is maximum at present single-phase unit compensation capacity, so can effectively be compensated so that long supply arm net is pressed.

3, under the AT supply power mode, the Building T of SCOTT traction transformer and Building M are equipped with this equipment simultaneously, it is jointly controlled, with the negative-sequence current is target, the supply arm net is pressed, the optimal control target of power factor for retraining satisfying, make this device when stablizing the terminal net pressure of contact line, guaranteed power factor greater than 0.9, and reduced the negative-sequence current of electric substation as far as possible.

Description of drawings

Fig. 1, be comprehensive compensation schematic diagram under the AT supply power mode;

Fig. 2, be SCOTT electric parameters vectogram;

Fig. 3, be 55kV direct hanging type TCR type SVC main circuit diagram of the present utility model;

Fig. 4, be the structural representation of photoelectricity isolated form 55KV direct hanging type TCR valve in the utility model device;

Fig. 5, be the structural representation rearview of photoelectricity isolated form 55KV direct hanging type TCR valve in the utility model device;

Fig. 6, be the structural representation end view of photoelectricity isolated form 55KV direct hanging type TCR valve in the utility model device.

Embodiment

Accompanying drawing has provided an embodiment of the present utility model, and the utility model will be further described below in conjunction with accompanying drawing.

Embodiment one

Improve the terminal net pressure device of supply arm in a kind of heavy haul railway AT electric power system, in heavy haul railway AT electric power system, be provided with SCOTT transformer 1, the SCOTT transformer has 20 two leading-out terminals in Building T 14 and Building M, Building T 14 and Building M 20 leading-out terminals at the SCOTT transformer are equipped with a cover respectively by a TCR branch road 15 and first capacitive branch (FC1) 16, the

SVC device

18 and 21 that second capacitive branch (FC2) 17 is formed, first capacitive branch (FC1) 16 wherein, (FC2) 17 is identical for second capacitive branch, and whole SVC device can the derate compensation in the time of can guaranteeing a cover maintenance.At uplink step-down TSC group 19 is housed simultaneously, step-down TSC group 19 is made as filter branch respectively 3,5 times.Wherein uplink is a heavy duty climbing line, and downlink is the descending line, therefore can reduce the electric current that flows through AT, good wave filtering effect in the uplink compensation.Circuit as shown in Figure 1, wherein KM is an on-load switch, AT1, AT2 are the autotransformer in the electric substation, AT3, AT4 are the autotransformer of supply arm end.

Whole device mainly comprises direct hanging type TCR thyristor stack and fixed compensation capacitor, and wherein direct hanging type TCR thyristor stack can be that photoelectricity isolated form 55KV direct hanging type TCR thyristor stack shown in accompanying drawing 4-6 is combined to form; The high-voltage thyristor heap body structure that described photoelectricity isolated form 55KV direct hanging type TCR thyristor stack is made up of 84 6500V thyristors of 42 set of pieces adopts heat pipe to add the wind-cooling heat dissipating mode.Wherein whole thyristor stack body is divided into 6 thyristor stack groups, and each thyristor stack group is the series connection of 7 6500V thyristor groups, then by 6 such thyristor stack body series connection moulding.

Each direct hanging type TCR thyristor stack structure is shown in accompanying drawing 4-6, by accompanying drawing 4-6 as can be seen direct hanging type TCR thyristor stack mainly comprise thyristor element 1, absorb electric capacity 3, equalizing resistance 4, radiator 8, and cooling fan 2, wherein, cooling fan 2 is positioned at the bottom of whole device, the air port is to last, and the support 9 by tape insulation above cooling fan supports a frame-saw 12, and various power devices are installed in the frame-saw 12; Described various power device comprises many group thyristor elements 1, absorbs electric capacity 3, equalizing resistance 4, organizes thyristor element 1 more and interconnects by connecting busbar 11; The photoelectricity trigger board 5, Overvoltage Protection Board 6, temperature detection plate 7 and the pulse distribution plate 10 that are used to control also are housed on support; Two groups of arrangement up and down in 1 fen of many group thyristor elements, each row is 7 thyristor elements, and two is a thyristor groups up and down, and 7 thyristor groups are by connection busbar 11 be cascaded (seeing accompanying drawing 4).Be glued with radiator 8 (seeing accompanying drawing 6) in the back of thyristor groups, radiator 8 can be a heat-pipe radiator, or other panel radiator; Absorb electric capacity 3 and equalizing resistance 4 and be installed in radiator 8 and the corresponding another side of thyristor groups; also be arranged with various control boards (seeing accompanying drawing 5) on the frame-saw 12 below absorbing electric capacity 3 and equalizing resistance 4, be followed successively by pulse distribution plate 10 photoelectricity trigger board 5,, Overvoltage Protection Board 6 and temperature detection plate 7.

Advantage of the present utility model is:

1. under the long supply arm of AT supply power mode, the compensation way that 55kV direct hanging type TCR type SVC and terminal step-down TSC combine has carried out comprehensive compensation to the pressure drop that system impedance, transformer impedance, line impedance cause.The two ends dispersion compensation can reduce the loss of offset current on long supply arm.At the supply arm head end 55kV direct hanging type TCR type SVC is set, to the operation of TCR type SVC, more the problems such as TCR type SVC overvoltage of the initiation of the tripping operation of on-load switch have not reduced the coupling of TCR type SVC and other problems in the time of can avoiding disconnecting on-load switch.The TSC that low capacity is set endways can the compensated line loss of voltage, though increase its capacity its also can bucking-out system, the loss of voltage that causes of transformer impedance, single offset current like this needs all by the supply arm circuit, this traction net burden that increased weight, cause to increase the line footpath of traction net, caused the loss of offset current simultaneously at circuit.

2. detect supply arm active power and valve group electric current by the TCR controller TSC of supply arm end is carried out switching control, can be so that the running wastage of bucking-out system drops to minimum.Because if the TSC in a distant place is not controlled, then cause the loss of capacity current that TSC sends, and increase the running wastage that TCR will compensate these capacity currents at circuit.

3. among the 55kV direct hanging type TCR type SVC, FC1 and FC2 are set to identical two covers, if wherein a cover maintenance does not influence another set of, therefore if the whole TCR type SVC of a cover maintenance can half operation of derate, can not move the improper circuit parking phenomenon that causes of the compensation that causes because of TCR type SVC.

4. having set up with the negative-sequence current minimum with the compensation arrangement of two seats of SCOTT is target, power factor and supply arm net are pressed the Optimal Control Strategy for constraint, improving the improvement that has taken into account the qualities of power supply such as negative-sequence current, power factor, harmonic filtration when the supply arm net is pressed, given full play to the effect of compensation arrangement.

Terminological interpretation:

TCR:Thyristor Controlled Reactor (thyristor-controlled reactor)

TSC:Thyristor Switched Capcitor (thyristor-controlled reactor)

FC:Fixed Capcitor (fixed capacity compensation)

AT:Autotransformer (autotransformer)

SCOTT:Scott Connected Transformers (Scott balancing transformer)

MSC:Mechanically Switched Capacitor (mechanical switched capacitor)

SVC:Static var compensator (static passive compensation device)

GPRS:General Packet Radio Service (GPRS)

Claims

1. a supply voltage at tail end of long supply arm of heavy haul railway improves device, it is characterized in that: the leading-out terminal at the main transformer of heavy haul railway AT electric power system is equipped with by TCR branch road and two SVC devices that capacitive branch is formed, and two capacitive branch are identical, with guarantee when maintenance cover whole SVC can the derate compensation to avoid the uncompensated electric voltage dropping that causes; At uplink step-down TSC group is housed simultaneously, is made as filter branch respectively 3,5 times; And uplink is a heavy duty climbing line, and downlink is the descending line.

2. supply voltage at tail end of long supply arm of heavy haul railway as claimed in claim 1 improves device, and it is characterized in that: described main transformer is the SCOTT main transformer; Described SVC device comprises direct hanging type TCR thyristor stack and fixed compensation capacitor, and wherein direct hanging type TCR thyristor stack is that photoelectricity isolated form direct hanging type TCR thyristor stack is combined to form.

3. supply voltage at tail end of long supply arm of heavy haul railway as claimed in claim 2 improves device, it is characterized in that: described photoelectricity isolated form direct hanging type TCR thyristor stack is a 55KV direct hanging type TCR thyristor stack, high-voltage thyristor heap body structure by 84 6500V thyristors of 42 set of pieces are formed adopts heat pipe to add the wind-cooling heat dissipating mode; Wherein whole thyristor stack body is divided into 6 thyristor stack groups, and each thyristor stack group is the series connection of 7 6500V thyristor groups, then by 6 such thyristor stack body series connection moulding.

4. supply voltage at tail end of long supply arm of heavy haul railway as claimed in claim 3 improves device, it is characterized in that: described direct hanging type TCR thyristor stack mainly comprises the thyristor element, absorbs electric capacity, equalizing resistance, radiator, and cooling fan, wherein, cooling fan is positioned at the bottom of whole device, the air port by frame-saw of stent support of tape insulation, is installed with various power devices to last in the frame-saw above cooling fan.

5. supply voltage at tail end of long supply arm of heavy haul railway as claimed in claim 4 improves device, it is characterized in that: described various power devices comprise many group thyristor elements, absorb electric capacity, equalizing resistance, organize the thyristor element more and interconnect by connecting busbar; The photoelectricity trigger board, Overvoltage Protection Board, temperature detection plate and the pulse distribution plate that are used to control also are housed on support; Many group thyristor elements divide two groups of arrangements up and down, and each row is 7 thyristor elements, and two is a thyristor groups up and down, and 7 thyristor groups are cascaded by connecting busbar; Back in thyristor groups is glued with radiator; Absorb electric capacity and equalizing resistance and be installed in radiator and the corresponding another side of thyristor groups, also be arranged with various control boards on the frame-saw below absorbing electric capacity and equalizing resistance, be followed successively by pulse distribution plate photoelectricity trigger board, Overvoltage Protection Board and temperature detection plate.

6. supply voltage at tail end of long supply arm of heavy haul railway as claimed in claim 4 improves device, and it is characterized in that: described radiator is a heat-pipe radiator.

7. supply voltage at tail end of long supply arm of heavy haul railway as claimed in claim 4 improves device, and it is characterized in that: described radiator is a panel radiator.