CN108923440A - A kind of negative sequence compensation measure and control device of traction substation group, system and method - Google Patents
A kind of negative sequence compensation measure and control device of traction substation group, system and method Download PDFInfo
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- CN108923440A CN108923440A CN201811063721.1A CN201811063721A CN108923440A CN 108923440 A CN108923440 A CN 108923440A CN 201811063721 A CN201811063721 A CN 201811063721A CN 108923440 A CN108923440 A CN 108923440A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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Abstract
The present invention provides the negative sequence compensation measure and control device of traction substation group a kind of, system and method, which includes n current transformer of n traction substation and voltage transformer and fiber optic network and controller in traction substation group；Controller input terminal is connect with the first current transformer of the first traction substation and first voltage mutual inductor, and is connect respectively with the current transformer of remaining n-1 traction substation and voltage transformer again by fiber optic network；Controller output end is connect with the control terminal of three-phase reactive power compensator.Not the technical issues of present invention does not change the effective power flow of traction substation group's Traction networks, can efficiently solve the plant issue and real-time compensation of negative phase-sequence progress centralized compensation of each traction substation generation of dispersion.
Description
Technical field
The present invention relates to attached wires of AC electrified railway to survey for electrical domain more particularly to the negative sequence compensation of traction substation group a kind of
Control device, system and method.
Background technique
Electric railway generallys use the single phase industrial frequency AC system powered by municipal power supply system, to keep single-phase traction negative
Equilibrium assignmen, electric railway often use the side of rotation phase sequence, split-phase switched-mode power supply to lotus as far as possible in three-phase electrical power system
Case.It is isolated between adjacent service area at split-phase subregion with neutral section insulator, forms electric split-phase, abbreviation split-phase.Electric split-phase link
It is link most weak in entire tractive power supply system, train excessively mutually becomes high-speed railway or even entire electric railway is led
Draw the bottleneck of power supply.
Theory and practice shows to use single-phase traction transformer or combined type cophase supply technology can be in traction substation
The electric split-phase for cancelling its exit uses bilateral connection technology that can cancel the electric split-phase at this, to eliminate confession in subregion
Storage battery neck improves railway power supply ability and transport capacity.Wherein, traction substation is same using single-phase traction transformer or combined type
The technology that phase power supply technique cancels the electric split-phase in its exit has been succeeded application, and effect is very good, and subregion it is bilateral
Connection is similar to the Electromagnetic coupling of power grid, restriction of the application by grid conditions, such as power grid transmission line and is formed with Traction networks
Parallel relationship and voltage class is closer to, it may appear that the larger problem of penetration (euqalizing current) in Traction networks, in addition
Lack relevant criterion, influences the implementation of two-side feeding (cyclization), but there is a kind of power supply structure not generate penetration, here it is spokes
Formula structure power supply mode is penetrated, i.e. the sectionalized busbar of the same substation of power grid is given multiple traction substations to be powered respectively, changed
Yan Zhi forms tree-like power supply in network graph theory：The substation is tree root, and each traction substation is leaf.At this point, becoming in traction
The used single-phase traction transformer of electricity or combined type cophase supply technology cancel the electric split-phase in its exit, use in subregion double
Side connection technology and cancel the electric split-phase at this, penetration would not be caused in Traction networks, to create power grid and railway
The situation of two-win.
Here, we claim the same substation of power grid to become with radiant type structure to these tractions that multiple traction substations are powered
Traction substation group carried out by electricity.Traction substation group carrying out through cophase supply, optimizing is constituted in this way：Draw power transformation
Institute's group's primary side is powered by the sectionalized busbar of same substation, and most 1 traction substation are negative sequence compensation electric substation in group,
Remaining is single-phase electric substation, and the voltage of all single-phase traction buses is separate identical in group.
For this purpose, inventors herein proposing " a kind of the negative phase-sequence centralized compensation control system and its control method of traction substation group
(application number：2018106212100) ", core is the same-phase compensation device ADA of negative sequence compensation electric substation by traction substation group
The active power regulation of Zhong Fei negative sequence compensation electric substation comes, and realizes negative phase-sequence by changing the effective power flow of traction substation group
Centralized compensation, keep negative phase-sequence up to standard.The study found that when traction substation group scale is bigger, the rule for the effective power flow for needing to change
Mould is bigger, and electrical distance is longer, and technical difficulty is bigger, and the economic indicator of network loss is poorer, or even can not achieve.
The present invention does not change the effective power flow of traction substation group, and traction substation group is solved by reactive power flow control
Negative phase-sequence centralized compensation the technical issues of, so that negative sequence management is up to state standards.
Summary of the invention
In view of above-mentioned technical problem, it is an object of the present invention to provide the negative sequence compensation measure and control device of traction substation group a kind of,
System and method can not only efficiently solve the negative phase-sequence that each traction substation dispersed in traction substation group generates and carry out
The plant issue of centralized compensation, moreover it is possible to efficiently solve the negative of each traction substation generation dispersed in traction substation group
Sequence concentrates the technical issues of carrying out real-time compensation.
In view of above-mentioned technical problem, present invention employs following technical solutions：
A kind of negative sequence compensation measure and control device of traction substation group, the traction substation group include the first traction power transformation
Institute, the second traction substation ... and the n-th traction substation, wherein the negative sequence compensation measure and control device includes the first traction
The first current transformer and first voltage mutual inductor of electric substation, the second current transformer of the second traction substation and the second electricity
Pressure mutual inductor ... and the n-th current transformer and the n-th voltage transformer, fiber optic network and control of the n-th traction substation
Device processed；The controller input terminal is connect with the first current transformer of the first traction substation and first voltage mutual inductor,
Input terminal by fiber optic network respectively with the second current transformer of the second traction substation and second voltage mutual inductor ...,
And n-th traction substation the n-th current transformer and the n-th voltage transformer connection；The controller output end and three-phase without
The control terminal of Reactive power compensation installations connects.
In view of above-mentioned technical problem, the present invention uses following technical solution again：
A kind of negative sequence compensation system of the traction substation group including negative sequence compensation measure and control device described in above-mentioned technical proposal
System, the negative sequence compensation system are installed in the first traction substation of traction substation group, wherein the negative sequence compensation system
It further include the three-phase transformer for being used for transmission negative sequence power and the three-phase reactive power compensator for generating negative sequence component；Described three
Phase transformer secondary side is connect with the three-phase reactive power compensator.
Preferably, the second main transformer pressure of the first main transformer of the first traction substation, the second traction substation
Device ... and the n-th main transformer of the n-th traction substation is all made of single-phase wiring.
Preferably, the negative sequence compensation measure and control device of traction substation group according to claim 1, which is characterized in that
First main transformer, the second main transformer ... and secondary side winding one end of the n-th main transformer is grounded respectively, another
One end respectively with it is corresponding first traction bus, second traction bus ... and n-th traction bus connection.
Preferably, first main transformer, the second main transformer ... and the primary side of the n-th main transformer is by same
The sectionalized busbar of substation is powered.
Preferably, first main transformer, the second main transformer ... and the n-th main transformer draws first respectively
Tractive feeder, the second tractive feeder ... and the n-th tractive feeder, the first tractive feeder, the second tractive feeder ..., with
And n-th tractive feeder feed out Traction networks, the Traction networks are the same as connecting.
Preferably, three-phase high-voltage bus, the AB two-phase in the three-phase high-voltage bus is arranged in first traction substation
It is connect with the primary side of the first main transformer of first traction substation, the C phase and three phase-change pressures of the three-phase high-voltage bus
The primary side of device connects.
In view of above-mentioned technical problem, the present invention uses following technical solution again：
A kind of negative sequence compensation method of the traction substation group using negative sequence compensation system described in above-mentioned technical proposal,
In, if substation's sectionalized busbar negative phase-sequence allows capacity to be Sd, Traction networks load power factor be 1, the negative sequence compensation method packet
It is specific as follows to include step：
Controller is led according to the first current transformer and first voltage mutual inductor of the first traction substation of t moment, second
Draw electric substation the second current transformer and second voltage mutual inductor ... and the n-th Current Mutual Inductance of the n-th traction substation
It is first active to calculate separately out corresponding first tractive feeder for the electric current and voltage that device and the n-th voltage transformer measure simultaneously
Power S1(t), the second active power S of the second tractive feeder2... and the n-th active power S of the n-th tractive feeder (t),n
(t)；
Controller further calculates the first active power S1(t), the second active power S2... and the n-th wattful power (t),
Rate Sn(t) in the active power summation S (t) of moment t, i.e. S (t)=S1(t)+S2(t)+……+Sn(t)；
The negative sequence power s that controller control three-phase reactive power compensator is exported in t momentC(t) phase of phase and s (t)
Position is on the contrary, and SC(t) size is：sC(t)=S (t)-Sd；
According to negative sequence power SC(t) whether less than threshold value VT, to judge three-phase reactive power compensator, whether there is or not stoppages in transit.
Preferably, as negative sequence power SC(t) it is less than threshold value VT, then three-phase reactive power compensator of stopping transport, even SC(t) it is equal to
VT；Conversely, then operating normally three-phase reactive power compensator.
It is further preferred that the threshold value VT is 0.
Compared with prior art, the beneficial effects of the invention are as follows：
One, through cophase supply can be implemented in a wider context, maximum magnitude cancels electric split-phase, do not generate and pass through function
Rate.
Two, an electric substation is set in multiple traction substations of traction substation group carry out negative phase-sequence centralized compensation, it can
Keep the overall structure of traction substation group most simplified；Required three-phase reactive power compensator only generates negative sequence component, does not generate positive sequence
Component does not occupy the positive sequence capacity of power grid.
Three, it realizes that strange land is synchronous with local data, by carrying out real-time negative phase-sequence control in idle domination set, does not change traction
The effective power flow of the Traction networks of electric substation or traction substation group does not increase additional Traction networks power loss.
Four, Traction networks are more advantageous to being utilized by tractor-trailer train for regeneration train electric energy with connecting, and reduce from electric system
Electricity consumption greatly increase energy-saving effect.
Five, reactive power compensator operating condition is reversible, when traction substation group is in equivalent regeneration regime, can still send to power grid
Electric energy up to standard out.
Six, other than being suitable for the traction substation and Traction networks directly powered, also for the traction substation of AT power supply and
Its Traction networks.
Seven, structure is simple, and superior performance, technologically advanced, method is reliable, easy to implement.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of negative sequence compensation measure and control device described in the embodiment of the present invention one.
Fig. 2 is the structural schematic diagram of controller described in the embodiment of the present invention one.
Fig. 3 is the structural schematic diagram of negative sequence compensation system described in the embodiment of the present invention two.
Fig. 4 is the concrete structure schematic diagram of negative sequence compensation system described in the embodiment of the present invention two.
Fig. 5 is the specific flow chart of negative sequence compensation method described in the embodiment of the present invention three.
Specific embodiment
The operation principle of the present invention is that：Hand over the straight power factor for handing over train very high, it is believed that=1, and each traction power transformation
Power factor it is identical, using to traction substation group power substation's sectionalized busbar be negative phase-sequence examination point, traction substation
Group in it is all it is single-phase traction buses voltages it is separate identical, in engineering it is each traction bus negative phase-sequence examination point place generation always
Negative-sequence current can be calculated with scalar algebraical sum, and total negative phase-sequence can be each in a traction substation progress centralized compensation, group
The negative sequence power of a electric substation and the negative sequence power for the negative sequence compensation system for being installed on some areal power substation examine point in negative phase-sequence
Reach national standard after synthesis (subtracting each other), wherein negative sequence compensation system generates negative phase-sequence tide by its three-phase reactive power compensator
Stream does not change the effective power flow of traction substation group and its negative phase-sequence type of flow in negative phase-sequence examination point；It is passed using fiber optic network
The synchrodata of defeated capacity big, fireballing advantage and the data synchronization technology acquisition each traction substation in strange land, meets real-time
Control requires.
The invention will be further described in the following with reference to the drawings and specific embodiments.
Embodiment one
As depicted in figs. 1 and 2, the embodiment of the present invention one provides the negative sequence compensation observing and controlling dress of traction substation group a kind of
It sets, the traction substation group includes the first traction substation SS1, the second traction substation SS2... and the n-th traction power transformation
Institute SSn, wherein the negative sequence compensation observing and controlling dress MC includes the first traction substation SS1The first Current Transmit1With first
Voltage transformer pt1, the second traction substation SS2The second Current Transmit2With second voltage mutual inductor PT2..., i-th
Traction substation SSiThe i-th Current TransmitiWith the i-th voltage transformer ptiAnd the n-th traction substation SSnN-th electricity
Current transformer CTnWith the n-th voltage transformer ptn, fiber optic network FO and controller PS；The controller PS input terminal and first
Traction substation SS1The first Current Transmit1With first voltage mutual inductor PT1Connection, input terminal pass through fiber optic network FO
Respectively with the second traction substation SS2The second Current Transmit2With second voltage mutual inductor PT2... and the n-th traction
Electric substation SSnThe n-th Current TransmitnWith the n-th voltage transformer ptnConnection；The controller PS output end and three-phase are idle
The control terminal of compensation device connects.Wherein i is 1,2 ... ..., n.
The negative sequence compensation measure and control device of traction substation group described in the embodiment of the present invention, not only contributes in a wider context
Implement through cophase supply, maximum magnitude cancels electric split-phase, do not generate penetration；And it also helps in traction substation
One electric substation of setting carries out negative phase-sequence centralized compensation in multiple traction substations of group, can make the overall structure of traction substation group
It is most simplified；Required three-phase reactive power compensator only generates negative sequence component, does not generate positive-sequence component, i.e., the positive sequence for not occupying power grid is held
Amount；Realize that strange land is synchronous with local data, by carrying out real-time negative phase-sequence control in idle domination set, do not change traction substation or
The effective power flow of the Traction networks of traction substation group does not increase additional Traction networks power loss；Traction networks more have with connecting
Conducive to being utilized by tractor-trailer train for regeneration train electric energy, reduces from the electricity consumption of electric system and greatly increase energy-saving effect；Meanwhile nothing
Reactive power compensation installations operating condition is reversible, and when traction substation group is in equivalent regeneration regime, electric energy up to standard can be still sent out to power grid
Embodiment two
As shown in Figure 3 and Figure 4, second embodiment of the present invention provides the negative sequence compensation system of traction substation group a kind of, institutes
Stating traction substation group includes the first traction substation SS1, the second traction substation SS2... and the n-th traction substation
SSn, the negative sequence compensation system NCS is installed on the first traction substation SS of traction substation group1In, wherein the negative phase-sequence is mended
The system NCS of repaying includes the three-phase transformer MT for being used for transmission negative sequence power, the three-phase reactive compensation dress for generating negative sequence component
Set SVG and negative sequence compensation measure and control device MC；The three-phase transformer MT secondary side is connect with the three-phase reactive power compensator SVG.
In embodiments of the present invention, the first traction substation SS1Three-phase high-voltage bus ABC is set, and the three-phase is high
Press A, B two-phase in bus ABC and the first traction substation SS1The first main transformer TT1Primary side connection, described three
A, B, C three-phase of phase high voltage bus ABC is connect with the primary side of three-phase transformer MT.
The negative sequence compensation measure and control device MC includes the first traction substation SS1The first Current Transmit1With the first electricity
Press mutual inductor PT1, the second traction substation SS2The second Current Transmit2With second voltage mutual inductor PT2... and
N-th traction substation SSnThe n-th Current TransmitnWith the n-th voltage transformer ptn, fiber optic network FO and controller PS；Institute
State controller PS input terminal and the first traction substation SS1The first Current Transmit1With first voltage mutual inductor PT1Connection,
Its input terminal by fiber optic network FO respectively with the second traction substation SS2The second Current Transmit2With second voltage mutual inductance
Device PT2... and the n-th traction substation SSnThe n-th Current TransmitnWith the n-th voltage transformer ptnConnection；The control
Device PS output end processed is connect with the control terminal of three-phase reactive power compensator.
In the present invention is implemented, the first traction substation SS1The first main transformer TT1, the second traction substation SS2's
Second main transformer TT2... and the n-th traction substation SSnThe n-th main transformer TTnIt is all made of single-phase wiring.It is described
First main transformer TT1, the second main transformer TT2... and the n-th main transformer TTnSecondary side winding one end be grounded respectively,
Its other end draws bus TB with corresponding first respectively1, second traction bus TB2... and the n-th traction bus TBn
Connection.The first main transformer TT1, the second main transformer TT2... and the n-th main transformer TTnPrimary side by same change
The sectionalized busbar in power station is powered.
In the present invention is implemented, the first main transformer TT1, the second main transformer TT2... and the n-th main transformer pressure
Device TTnThe first tractive feeder F is drawn respectively1, the second tractive feeder F2... and the n-th tractive feeder Fn, the first tractive feeder
F1, the second tractive feeder F2... and the n-th tractive feeder FnTraction networks OCS is fed out, the Traction networks OCS is same to connect.?
Traction networks OCS is to train L in the embodiment of the present invention1、L2... and LnPower supply.
Negative sequence compensation system NCS described in the embodiment of the present invention generates negative phase-sequence trend by its three-phase reactive power compensator SVG,
The effective power flow of traction substation group and its negative phase-sequence type of flow in PCC are not changed；, speed big using fiber optic network transmission capacity
The synchrodata that fast advantage and data synchronization technology obtain each traction substation in strange land is spent, requirement of real-time control is met.Cause
This, the embodiment of the present invention can not only implement through cophase supply in a wider context, and maximum magnitude is cancelled electric split-phase, do not produced
Raw penetration；An electric substation can also be set in multiple traction substations of traction substation group carries out negative phase-sequence concentration benefit
It repays, the overall structure of traction substation group can be made most simplified；Required three-phase reactive power compensator only generates negative sequence component, does not generate
Positive-sequence component does not occupy the positive sequence capacity of power grid.Also realize that strange land is synchronous with local data simultaneously, by idle domination set
Real-time negative phase-sequence control is carried out, does not change the effective power flow of traction substation or the Traction networks of traction substation group, is not increased additional
Traction networks power loss.In addition, being more advantageous to the sharp by tractor-trailer train of regeneration train electric energy by Traction networks with connecting
With reduction greatly increases energy-saving effect from the electricity consumption of electric system.
Embodiment three
As shown in figure 5, the embodiment of the present invention three provides the negative sequence compensation method of traction substation group a kind of, wherein set
Substation's sectionalized busbar negative phase-sequence allows capacity to be Sd, Traction networks load power factor be 1, the negative sequence compensation method includes step
It is specific as follows：
Controller PS is according to the first traction substation of t moment SS1The first Current Transmit1With first voltage mutual inductor
PT1, the second traction substation SS2The second Current Transmit2With second voltage mutual inductor PT2... and the n-th traction becomes
Electric institute SSnThe n-th Current TransmitnWith the n-th voltage transformer ptnThe electric current, voltage of measurement simultaneously calculate separately out corresponding
The first tractive feeder F1The first active power S1(t), the second tractive feeder F2The second active power S2(t) ..., with
And the n-th tractive feeder FnThe n-th active power Sn(t)；
Controller PS further calculates the first active power S1(t), the second active power S2(t) ... and n-th is active
Power Sn(t) in the active power summation S (t) of moment t, i.e. S (t)=S1(t)+S2(t)+……+Sn(t)；
The negative sequence power S that controller PS control three-phase reactive power compensator SVG is exported in t momentC(t) phase and S (t)
Opposite in phase, and SC(t) size is：SC(t)=S (t)-Sd；
According to negative sequence power SC(t) whether less than threshold value VT, to judge three-phase reactive power compensator SVG, whether there is or not stoppages in transit.
In embodiments of the present invention, as negative sequence power SC(t) be less than threshold value VT, then stop transport three-phase reactive power compensator SVG,
Even SC(t) it is equal to VT；Conversely, then operating normally three-phase reactive power compensator SVG.Specifically in embodiments of the present invention, described
Threshold value VT is 0, as negative sequence power SC(t) it is less than threshold value 0, enables SC(t) it is equal to 0, then represents three-phase reactive power compensator SVG stoppage in transit；
Conversely, then operating normally three-phase reactive power compensator SVG.
The negative sequence compensation method of traction substation group described in the embodiment of the present invention can not only be implemented to pass through in a wider context
General formula cophase supply, maximum magnitude cancel electric split-phase, do not generate penetration；It can also be in multiple tractions of traction substation group
An electric substation is set in electric substation and carries out negative phase-sequence centralized compensation, and the overall structure of traction substation group can be made most simplified；It is required
Three-phase reactive power compensator only generates negative sequence component, does not generate positive-sequence component, i.e., does not occupy the positive sequence capacity of power grid.It is also real simultaneously
Existing strange land is synchronous with local data, by carrying out real-time negative phase-sequence control in idle domination set, does not change traction substation or traction
The effective power flow of the Traction networks of electric substation group, does not increase additional Traction networks power loss.In addition, mutually being passed through by the way that Traction networks are same
It is logical, it is more advantageous to being utilized by tractor-trailer train for regeneration train electric energy, reduces from the electricity consumption of electric system and greatly increases energy-saving effect.
Claims (10)
1. a kind of negative sequence compensation measure and control device of traction substation group, the traction substation group includes the first traction substation
(SS1), the second traction substation (SS2) ... and the n-th traction substation (SSn), it is characterised in that：The negative sequence compensation is surveyed
Controlling device (MC) includes the first traction substation (SS1) the first current transformer (CT1) and first voltage mutual inductor (PT1),
Two traction substation (SS2) the second current transformer (CT2) and second voltage mutual inductor (PT2) ..., the n-th traction substation
(SSn) the n-th current transformer (CTn) and the n-th voltage transformer (PTn), fiber optic network (FO) and controller (PS)；It is described
The input terminal of controller (PS) and the first traction substation (SS1) the first current transformer (CT1) and first voltage mutual inductor
(PT1) connection, controller (PS) input terminal by fiber optic network (FO) respectively with the second traction substation (SS2) the second electric current
Mutual inductor (CT2) and second voltage mutual inductor (PT2) ..., the n-th traction substation (SSn) the n-th current transformer (CTn) and
N-th voltage transformer (PTn) connection；The control terminal that controller (PS) output end and three-phase reactive compensation dress (SVG) are set connects
It connects.
2. a kind of negative sequence compensation system of the traction substation group including negative sequence compensation measure and control device described in the claims 1
System, the negative sequence compensation system (NCS) are installed on the first traction substation (SS of traction substation group1) in, which is characterized in that
The negative sequence compensation system (NCS) further includes being used for transmission the three-phase transformer (MT) of negative sequence power and for generating negative sequence component
Three-phase reactive power compensator (SVG)；Three-phase transformer (MT) secondary side and the three-phase reactive power compensator (SVG) are even
It connects.
3. the negative sequence compensation system of traction substation group according to claim 2, it is characterised in that：First traction becomes
Electric institute (SS1) the first main transformer (TT1), the second traction substation (SS2) the second main transformer (TT2) ... and the
N traction substation (SSn) the n-th main transformer (TTn) it is all made of single-phase wiring.
4. the negative sequence compensation system of traction substation group according to claim 3, which is characterized in that the first main transformer pressure
Device (TT1), the second main transformer (TT2) ... and the n-th main transformer (TTn) secondary side winding one end be grounded respectively, it is another
Bus (TB is drawn with corresponding first respectively in one end1), second traction bus (TB2) ... and the n-th traction bus
(TBn) connection.
5. the negative sequence compensation system of traction substation group according to claim 3, which is characterized in that the first main transformer pressure
Device (TT1), the second main transformer (TT2) ... and the n-th main transformer (TTn) primary side it is female by the segmentation of same substation
Line power supply.
6. the negative sequence compensation system of traction substation group according to claim 3, which is characterized in that the first main transformer pressure
Device (TT1), the second main transformer (TT2) ... and the n-th main transformer (TTn) the first tractive feeder (F is drawn respectively1),
Two tractive feeder (F2) ... and the n-th tractive feeder (Fn), the first tractive feeder (F1), the second tractive feeder
(F2) ... and the n-th tractive feeder (Fn) feed out Traction networks (OCS), the Traction networks (OCS) are same to be connected.
7. the negative sequence compensation system of traction substation group according to claim 3, which is characterized in that first traction
Electric substation (SS1) three-phase high-voltage bus (ABC) is set, the AB two-phase in the three-phase high-voltage bus (ABC) is led with described first
Draw electric substation (SS1) the first main transformer (TT1) primary side connection, A, B, C three-phase of the three-phase high-voltage bus (ABC) with
The primary side of three-phase transformer (MT) connects.
8. a kind of traction substation group's using negative sequence compensation system described in any one of the claims 2 to 7 is negative
Sequence compensation method, which is characterized in that setting substation's sectionalized busbar negative phase-sequence permission capacity as Sd, Traction networks load power factor is 1,
The negative sequence compensation method includes that step is specific as follows：
Controller (PS) is according to the first traction substation of t moment (SS1) the first current transformer (CT1) and first voltage mutual inductance
Device (PT1), the second traction substation (SS2) the second current transformer (CT2) and second voltage mutual inductor (PT2) ..., with
And the n-th traction substation (SSn) the n-th current transformer (CTn) and the n-th voltage transformer (PTn) simultaneously measurement electric current and electricity
Pressure calculates separately out corresponding first tractive feeder (F1) the first active power S1(t), the second tractive feeder (F2) second
Active power S2... and the n-th tractive feeder (F (t),n) the n-th active power Sn(t)；
Controller (PS) further calculates the first active power S1(t), the second active power S2... and the n-th wattful power (t),
Rate Sn(t) in the active power summation S (t) of moment t, i.e. S (t)=S1(t)+S2(t)+……+Sn(t)；Controller (PS) control
The negative sequence power S that three-phase reactive power compensator (SVG) is exported in t momentC(t) opposite in phase of phase and S (t), and SC(t)
Size be：SC(t)=S (t)-Sd；
According to negative sequence power sC(t) whether less than threshold value VT, to judge three-phase reactive power compensator (SVG), whether there is or not stoppages in transit.
9. the negative sequence compensation method of traction substation group according to claim 8, which is characterized in that as negative sequence power SC
(t) it is less than threshold value VT, then stop transport three-phase reactive power compensator (SVG), even SC(t) it is equal to VT；Conversely, then operating normally three-phase
Reactive power compensator (SVG).
10. the negative sequence compensation method of traction substation group according to claim 8 or 9, which is characterized in that the threshold value
VT is 0.
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