CN103592573B - Residing for subregion, up-downgoing Traction networks is not in the fault distance-finding method of parallel connection - Google Patents

Abstract

The invention belongs to electrical engineering field, residing for the subregion being specifically related to high-speed railway power supply traction network, up-downgoing Traction networks is not in the fault distance-finding method of parallel connection, in order to judge fault type under this state, direction and accurately locating trouble spot.The present invention defines up-downgoing electric current ratio, carry out the range determination of fault than fault localization principle and reactance method range finding according to up-downgoing electric current, solve existing fault localization system can not be in parallel connection range finding problem to up-downgoing Traction networks residing for subregion, simultaneously, can accurately failure judgement up-downgoing and fault type, provide correct fault distance, looking up the fault point is rapid, can ensure that high-speed railway power supply traction network restores electricity rapidly.

Description

Residing for subregion, up-downgoing Traction networks is not in the fault distance-finding method of parallel connection

Technical field

The invention belongs to electrical engineering field, residing for the subregion that the present invention relates to high-speed railway power supply traction network, up-downgoing Traction networks is not in the fault distance-finding method of parallel connection.

Background technology

In today of economic height development, railway just advances towards the direction of high speed, heavy duty, builds the needs that high-speed railway meets China's economic development and national conditions.High-speed railway will adopt electric propulsion, electric power system as an important component part of electric railway, the selection of its power supply mode also just one of key factor becoming Develop High-Speed Railway.AT power supply mode, with the advantage of himself, is widely used in France, Japan and other countries, also more and more receives the concern of China railways department.

China Express Railway power supply traction network adopts all-parallel AT traction system mode.Employing all-parallel AT traction system mode, carries out more rational relaying configuration to its tractive power supply system and more accurate fault localization is had higher requirement.When Traction networks breaks down, we usually adopt electric substation, AT institute, subregion the distance measuring equipment synchronous acquisition fault bus voltage at three places, feeder current, AT suct electric current etc., residing for power transformation, finally adopt AT to suct electric current than range measurement principle, trouble spot positioned.

Inspecting state at certain after high-speed railway power supply traction network not yet drops into formal operation or formal operation, there will be the method for operation that some are special, such as residing for subregion, up-downgoing Traction networks is not in parallel connection.Existing technology can not solve the fault localization under this kind of special method of operation.

Summary of the invention

Fault distance-finding method under the object of the present invention is to provide up-downgoing Traction networks residing for a kind of subregion not to be in parallel connection, in order to the type of failure judgement, direction and accurately locating trouble spot.

The object of the invention is to be achieved through the following technical solutions, comprise following steps:

S1, definition up-downgoing electric current compare Q _sxcomputing formula be:

$Q_{\mathrm{sx}}=\frac{\min \left(\right|{\stackrel{\·}{I}}_{\mathrm{TF}10}|,|{\stackrel{\·}{I}}_{\mathrm{TF}20}\left|\right)}{\left|{\stackrel{\·}{I}}_{\mathrm{TF}10}\right|+\left|{\stackrel{\·}{I}}_{\mathrm{TF}20}\right|},$ Wherein, ${\stackrel{\·}{I}}_{\mathrm{TF}10}={\stackrel{\·}{I}}_{T10}-{\stackrel{\·}{I}}_{F10},{\stackrel{\·}{I}}_{\mathrm{TF}20}={\stackrel{\·}{I}}_{T20}-{\stackrel{\·}{I}}_{F20},$ for electric substation descending feeder line T line current, for electric substation descending feeder line F line current, for electric substation up feeder line T line current, for electric substation up feeder line F line current;

S2, when fault occur in electric substation and AT institute between, Q according to S1 _sxup-downgoing electric current is adopted to find range than fault localization principle, L=2Q _sxd ₀, wherein, L is the distance of trouble spot to electric substation, D ₀for electric substation to AT distance;

S3, when fault occur in AT institute and subregion institute between, according to T, F, TF tri-class fault type press carry out reactance method range finding, wherein, X is calculating reactance, x ₀for unit reactance, there is different unit reactance to different fault types (T, F, TF).

Further, calculating reactance X described in S3 divides following two kinds of situations:

When fault occurs in downlink side:

$X=\left|\mathrm{imag}\left(\frac{{\stackrel{\·}{U}}_1}{{\stackrel{\·}{I}}_{T11}-{\stackrel{\·}{I}}_{F11}}\right)\right|;$

When fault occurs in upstream side:

$X=\left|\mathrm{imag}\left(\frac{{\stackrel{\·}{U}}_1}{{\stackrel{\·}{I}}_{T21}-{\stackrel{\·}{I}}_{F21}}\right)\right|,$ Wherein, ${\stackrel{\·}{U}}_1={\stackrel{\·}{U}}_{T1}-{\stackrel{\·}{U}}_{F1}$ For AT institute busbar voltage, by the descending T line current of AT, by the descending F line current of AT, the up T line current of AT, by the up F line current of AT.

Further, described in S3, T, F, TF tri-class fault type determination methods are as follows: the electric current that sucts residing for electric substation, AT is all less than I _zdtime, then failure judgement is TF type fault; Residing for electric substation, AT suct electric current meet all be less than I _zdtime, then failure judgement is T fault or F fault, wherein, and I _zdfor empirical data, I _zd=1200A.

Further, described in S3, T, F, TF tri-fault direction determination methods of class fault type are as follows:

When there is TF type fault, the size according to θ carries out up-downgoing judgement, and wherein, θ is with angle, for AT institute busbar voltage, by the descending T line current of AT, by the descending F line current of AT;

When there is non-TF type fault, the electric current sucting the larger place place of electric current according to AT carries out fault type and up-downgoing judges, to suct electric current comparatively large for AT residing for the power transformation, according to electric substation descending feeder line T line current descending feeder line F line current up feeder line T line current up feeder line F line current judge; To suct electric current comparatively large for AT residing for the AT, according to the descending feeder line T line current of AT descending feeder line F line current up feeder line T line current up feeder line F line current judge.

Further, when there is described TF type fault, when-20 °≤θ≤160 °, then failure judgement occurs in up; When-180 °≤θ <-20 ° or 160 ° of < θ≤180 °, then failure judgement occurs in descending;

When there is described non-TF fault, to suct electric current comparatively large for AT residing for the power transformation, when time maximum, fault is the T-shaped fault of downlink side; When time maximum, fault is downlink side F type fault; When time maximum, fault is the T-shaped fault of upstream side; When time maximum, fault is upstream side F type fault; To suct electric current comparatively large for AT residing for the AT, when time maximum, fault is the T-shaped fault of downlink side; When time maximum, fault is downlink side F type fault; When time maximum, fault is the T-shaped fault of upstream side; When time maximum, fault is upstream side F type fault.

The invention has the beneficial effects as follows: solve existing fault localization system can not be in parallel connection range finding problem to up-downgoing Traction networks residing for subregion, simultaneously, can accurately failure judgement up-downgoing and fault type, provide correct fault distance, looking up the fault point is rapid, can ensure that high-speed railway power supply traction network restores electricity rapidly.

Accompanying drawing explanation

Fig. 1 is high-speed railway all-parallel AT traction system mode.

Fig. 2 is high-speed railway fault localization block schematic illustration.

Fig. 3 is the special method of operation of high-speed railway each place analog quantity schematic diagram.

Fig. 4 is Malab/Simulink realistic model figure of the present invention.

In figure, T is time centre tapped single transformer of sideband, the autotransformer that the autotransformer that CB1, CB2 are AT for two feeder breakers, AT1, AT2 are subregion.T1 is descending contact net, R1 is descending rail, F1 is descending positive feeder, T2 is up contact net, R2 is up rail, F2 is up positive feeder.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described:

In Fig. 1, each switch is in co-bit, and Traction networks uplink and downlink are parallel connection at electric substation, AT institute, subregion.

As shown in Figure 2, electric substation, AT institute and subregion institute config failure distance measuring equipment, wherein, the fault location device of electric substation's configuration except gather this institute data also receive simultaneously AT the fault data that gathers with subregion, and carry out fault localization analysis.Range measurement system configure dedicated optical-fibre channel is used for transmission fault data.

The judgement of fault type:

When the electric current that sucts residing for electric substation, AT is all less than I _zdtime, then failure judgement is TF fault, wherein, and I _zdfor empirical data, I _zd=1200A.

When there is TF fault, when-20 °≤θ≤160 °, then failure judgement occurs in up; When-180 °≤θ <-20 ° or 160 ° of < θ≤180 °, then failure judgement occurs in descending, and wherein, θ is with angle, for AT institute busbar voltage, by the descending T line current of AT, by the descending F line current of AT.

When occurring not to be TF type fault, the electric current sucting the larger place place of electric current according to AT carries out fault type and up-downgoing judgement, can be divided into two kinds of situations:

I, residing for the power transformation AT to suct electric current comparatively large, according to electric substation descending feeder line T line current descending feeder line F line current up feeder line T line current up feeder line F line current differentiate.When time maximum, fault is the T-shaped fault of downlink side; When time maximum, fault is downlink side F type fault; When time maximum, fault is the T-shaped fault of upstream side; When time maximum, fault is upstream side F type fault.

II, residing for the AT AT to suct electric current comparatively large, according to the descending feeder line T line current of AT descending feeder line F line current up feeder line T line current up feeder line F line current differentiate.When time maximum, fault is the T-shaped fault of downlink side; When time maximum, fault is downlink side F type fault; When time maximum, fault is the T-shaped fault of upstream side; When time maximum, fault is upstream side F type fault.

Secondly, fault localization is carried out:

Definition up-downgoing electric current compares Q _sxcomputing formula be:

$Q_{\mathrm{sx}}=\frac{\min \left(\right|{\stackrel{\&CenterDot;}{I}}_{\mathrm{TF}10}|,|{\stackrel{\&CenterDot;}{I}}_{\mathrm{TF}20}\left|\right)}{\left|{\stackrel{\&CenterDot;}{I}}_{\mathrm{TF}10}\right|+\left|{\stackrel{\&CenterDot;}{I}}_{\mathrm{TF}20}\right|}---\left(1\right)$

When fault occurs between electric substation and AT institute, adopt up-downgoing electric current than fault localization principle by formula (1).

L＝2Q _sxD ₀（2）

Wherein, L is the distance of trouble spot to electric substation, D ₀for electric substation to AT distance.

When fault occur in AT institute and subregion institute between, according to T, F, TF tri-class fault type carry out reactance method range finding by formula (3).

$L=D_0+\frac{X}{2x_0}---\left(3\right)$

Wherein, X is calculating reactance, x ₀for unit reactance, there is different unit reactance to different fault types (T, F, TF).

In order to more accurate fault localization, generally AT to subregion institute between adopt reactance distance look-up table range finding.

Calculate range finding reactance X and divide following two kinds of situations:

When fault occurs in downlink side:

$X=\left|\mathrm{imag}\left(\frac{{\stackrel{\&CenterDot;}{U}}_1}{{\stackrel{\&CenterDot;}{I}}_{T11}-{\stackrel{\&CenterDot;}{I}}_{F11}}\right)\right|---\left(4\right)$

When fault occurs in upstream side:

$X=\left|\mathrm{imag}\left(\frac{{\stackrel{\&CenterDot;}{U}}_1}{{\stackrel{\&CenterDot;}{I}}_{T21}-{\stackrel{\&CenterDot;}{I}}_{F21}}\right)\right|---\left(5\right)$

The realistic model based on Malab/Simulink as shown in Figure 4, wherein, system voltage is 220kV, system impedance is: 0.5+j4.71 Ω, the centre tapped single transformer of secondary sideband (being made up of 2 winding transformers): capacity 40MVA, 220/27.5/27.5kV, AT transformer (being made up of single transformer): capacity 20MVA, leakage reactance: 0.15+j0.6 Ω, each AT section circuit (forming Traction networks by the impedance branch of 6 band mutual inductances) length: L1=15km, L2=15km, Traction networks unit impedance parameter is as follows:

$Z=\left[\begin{array}{ccccccc}& T1& R1& F1& T2& R2& F2\\ T1& 0.1683+j0.5866& 0.05+j0.314& 0.05+j0.413& 0.05+j0.3275& 0.05+0.314& 0.05+j0.292\\ R1& 0.05+j0.314& 0.212+j0.7463& 0.05+j0.314& 0.05+j0.2918& 0.05+j0.314& 0.05+j0.2918\\ F1& 0.05+j0.413& 0.05+j0.314& 0.1452+j0.7134& 0.05+j0.292& 0.05+j0.2918& 0.05+j0.2629\\ T2& 0.05+j0.3275& 0.05+j0.317& 0.05+j0.292& 0.1683+j0.5866& 0.05+j0.314& 0.05+j0.4130\\ R2& 0.05+0.314& 0.05+j0.314& 0.05+j0.2918& 0.05+j0.314& 0.212+j0.7463& 0.05+j0.314\\ F2& 0.05+j0.292& 0.05+j0.2918& 0.05+j0.2629& 0.05+j0.4130& 0.05+j0.314& 0.1452+j0.7134\end{array}\right]$

Simulation result is as follows:

1. fault type and fault direction simulation result as shown in table 1, consider the symmetry of up fault and descending fault, table 1 only illustrates the emulated data of descending fault.

The descending fault distinguishing result of table 1

2. table 1 is pressed as shown in table 2 for fault distance computer sim-ulation acquired results.

Electric current ratio-distance relation table and reactance-distance relation table under table 23 kind of fault type

As can be seen from Table 1, fault type, up-downgoing can correctly judge.

As can be seen from Table 2, when fault is between electric substation-AT institute, adopt up-downgoing current ratio method can accurate fault localization, when fault occurs between AT institute-subregion institute, residing for AT, measure the dull rising characteristic of reactance X to fault distance adopt reactance apart from look-up table precision ranging.

Claims (5)

1. residing for subregion, up-downgoing Traction networks is not in the fault distance-finding method of parallel connection, it is characterized in that: comprise the following steps:

S1, definition up-downgoing electric current compare Q _sxcomputing formula be:

wherein, for electric substation descending feeder line T line current, for electric substation descending feeder line F line current, for electric substation up feeder line T line current, for electric substation up feeder line F line current;

S2, when fault occur in electric substation and AT institute between, Q according to S1 _sxup-downgoing electric current is adopted to find range than fault localization principle, L=2Q _sxd ₀, wherein, L is the distance of trouble spot to electric substation, D ₀for electric substation to AT distance;

S3, when fault occur in AT institute and subregion institute between, according to T, F, TF tri-class fault type press carry out reactance method range finding, wherein, X is calculating reactance, x ₀for unit reactance, to different fault types, namely described T, F, TF tri-class fault have different unit reactance.

2. residing for subregion according to claim 1, up-downgoing Traction networks is not in the fault distance-finding method of parallel connection, it is characterized in that: calculating reactance X described in S3 divides following two kinds of situations:

When fault occurs in downlink side:

When fault occurs in upstream side:

wherein, for AT institute busbar voltage, by the descending T line current of AT, by the descending F line current of AT, the up T line current of AT, by the up F line current of AT.

3. residing for subregion according to claim 1, up-downgoing Traction networks is not in the fault distance-finding method of parallel connection, it is characterized in that: described in S3, T, F, TF tri-class fault type determination methods are as follows: the electric current that sucts residing for electric substation, AT is all less than I _zdtime, then failure judgement is TF type fault; Residing for electric substation, AT suct electric current meet all be less than I _zdtime, then failure judgement is T fault or F fault, wherein, and I _zdfor empirical data, I _zd=1200A.

4. residing for subregion according to claim 1, up-downgoing Traction networks is not in the fault distance-finding method of parallel connection, it is characterized in that: described in S3, T, F, TF tri-fault direction determination methods of class fault type are as follows:

When there is TF type fault, the size according to θ carries out up-downgoing judgement, and wherein, θ is with angle, for AT institute busbar voltage, by the descending T line current of AT, by the descending F line current of AT;

When there is non-TF type fault, the electric current sucting the larger place place of electric current according to AT carries out fault type and up-downgoing judges, to suct electric current comparatively large for AT residing for the power transformation, according to electric substation descending feeder line T line current descending feeder line F line current up feeder line T line current up feeder line F line current judge; To suct electric current comparatively large for AT residing for the AT, according to the descending feeder line T line current of AT descending feeder line F line current up feeder line T line current up feeder line F line current judge.

5. residing for subregion according to claim 4, up-downgoing Traction networks is not in the fault distance-finding method of parallel connection, it is characterized in that: when there is described TF type fault, when-20 °≤θ≤160 °, then failure judgement occurs in up; When-180 °≤θ <-20 ° or 160 ° of < θ≤180 °, then failure judgement occurs in descending;

When there is described non-TF fault, to suct electric current comparatively large for AT residing for the power transformation, when time maximum, fault is the T-shaped fault of downlink side; When time maximum, fault is downlink side F type fault; When time maximum, fault is the T-shaped fault of upstream side; When time maximum, fault is upstream side F type fault; To suct electric current comparatively large for AT residing for the AT, when time maximum, fault is the T-shaped fault of downlink side; When time maximum, fault is downlink side F type fault; When time maximum, fault is the T-shaped fault of upstream side; When time maximum, fault is upstream side F type fault.