CN105691244A

CN105691244A - System no-load monitoring device for electrified railway cut-through power supply and monitoring method thereof

Info

Publication number: CN105691244A
Application number: CN201610131506.5A
Authority: CN
Inventors: 李群湛; 郭锴; 解绍锋; 赵艺
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2016-03-09
Filing date: 2016-03-09
Publication date: 2016-06-22
Anticipated expiration: 2036-03-09
Also published as: CN105691244B

Abstract

The invention provides a system no-load monitoring device for an electrified railway cut-through power supply system and a monitoring method thereof and relates to the technical field of alternating-current electrified railway power supply. A substation TS0 installing monitor is selected from the electrified railway cut-through power supply system. The input end of the monitor is connected with a measuring end of a feeder line current transformer of a substation TS0. The output end of the monitor is connected to the control ends of other substation feeder line circuit breakers through an optical network. When detecting that feeder line currents detected by the measuring end of the feeder line current transformer are smaller than or equal to a designated value, the monitor of the substation S0 outputs an order to the control ends of the other substation feeder line circuit breakers through the optical network to enable the feeder line circuit breakers to be tripped, or else the other substation feeder line circuit breakers still keep an on-position state. Accordingly, whether the system is in the no-load state or not can be judged accurately, in the no-load state, the circuit breakers for balancing the minimum cut centralization of a loop formed by the currents are tripped off, and the balance currents formed between the electrified railway cut-through power supply system and a power grid in the no-load state are effectively eliminated.

Description

The system zero load supervising device of the through power supply of a kind of electric railway and monitoring method thereof

Technical field

The present invention relates to attached wires of AC electrified railway power supply technique field, particularly relate to the power supply technique of the through electric power system of electric railway。

Background technology

The commonly used single phase industrial frequency AC system powered by municipal power supply system of electric railway, for making single-phase traction load equilibrium assignmen as far as possible in three-phase electrical power system, electric railway often adopts the scheme of rotation phase sequence, point phase switched-mode power supply。Divide and isolate with neutral section insulator between the adjacent service area at phase subregion place, form electricity point phase, an abbreviation point phase。The traditional approach of the logical phase splitting of electric locomotive is manual undue phase, relies primarily on driver and is performed manually by and moves back level, close auxiliary unit, disconnected main circuit breaker, cross neutral section, again co-host break road device by train inertia, close auxiliary unit and then recover traction power to complete undue phase。This artificial commutation mode easily causes the charged logical phase splitting of electric locomotive (undue phase) and occurs arcing to burn out overhead contact line parts, even results in the accidents such as phase fault。Continuous rising along with train speed, have employed automatic passing over of neutral section technology, mainly there is automatically switch on undue phase, vehicle-mounted automatic passing over of neutral section and post automatic passing over of neutral section etc. of floor switches several, but still suffer from the electric process of transient state of the logical phase splitting of train in switch switching, it is easily generated bigger switching overvoltage or overcurrent, cause the accidents such as Traction networks and mobile unit scaling loss, even result in automatic passing over of neutral section operation failure, affect power supply reliability and safe train operation。Therefore, electricity point phase link is link the weakest in whole tractive power supply system, the bottleneck that train becomes high-speed railway too mutually or even whole electric railway traction is powered。

Theory and practice shows to adopt single-phase traction transformer or combination type cophase supply technology can cancel the electricity point phase in its exit at traction substation, can cancel the electricity point phase at this place in the adopted two-side feeding technology of subregion。On lines join ground, traction substation adopts cophase supply technology and the adopted two-side feeding technology of subregion to be the formation of cancelling completely the tractive power supply system of electricity point phase, is called through electric power system, thus eliminating power supply bottleneck, improves power supply capacity and transport capacity。It will be appreciated, however, that through power supply is implemented in electric railway more or less will cause undesirable euqalizing current (penetration) between electrical network and tractive power supply system。Euqalizing current (penetration) shows when tractive power supply system zero load substantially, and euqalizing current " will be flooded " by load institute when load is more than no-load current。The present invention can effectively eliminate euqalizing current during through electric power system zero load。

Summary of the invention

It is an object of the invention to provide the system zero load supervising device of the through power supply of a kind of electric railway, it can eliminate euqalizing current during zero load effectively。

It is a further object to provide the system zero load of a kind of electric railway through power supply monitoring method, it can effectively monitor euqalizing current problem during contact net zero load。

This invention address that its technical problem, the technical scheme adopted is: the system zero load supervising device of the through power supply of a kind of electric railway, the former limit of main converter MT of each traction substation connects three phase network ABC, secondary limit is connected to Traction networks OCS through traction bus TB, tractive feeder F and feeder breaker K and feeder current transformer CT thereof, and the Traction networks OCS between each traction substation is connected to implement electric railway with connecting power supply；A traction substation is selected to be designated as electric substation TS₀, all the other traction substations are designated as electric substation TS_i, i=1 ..., n-1, n >=2；Unloaded supervising device includes electric substation TS₀Watch-dog SU, electric substation TS₀Feeder current transformer CT₀, fiber optic network FO and each electric substation TS_iFeeder breaker K_i；The input of watch-dog SU connects electric substation TS₀Feeder current transformer CT₀Measurement end MU, the outfan of watch-dog SU is connected to each electric substation TS through fiber optic network FO_iFeeder breaker K_iControl end CU_i。

Another object of the present invention is achieved through the following technical solutions: the system zero load monitoring method of the through power supply of a kind of electric railway, as electric substation TS₀Watch-dog SU by feeder current transformer CT₀When measuring the end MU tractive feeder electric current detected less than or equal to designated value, watch-dog SU is through fiber optic network FO output order to each electric substation TS_iFeeder breaker K_iControl end CU_iMake feeder breaker K_iTripping operation, otherwise each electric substation TS_iFeeder breaker K_iMaintenance "on" position, i=1 ..., n-1, n >=2。This through electric power system is used for the through electric power system of electric railway being made up of Traction networks OCS and n seat traction substation。

Designated value refers to that the through electric power system of electric railway is subject to unloaded trend value when flowing or no-load current value without train, is mainly charging trend or the charging current of this through electric power system, and its numerical value is much smaller than train load。

As electric substation TS_iDuring more than 2, should as far as possible by electric substation TS₀It is positioned close to the position in the middle of system。

Obviously, feeder breaker can be conventional mechanical switch, it is also possible to be electronic power switch。

The operation principle of the present invention is: utilize fiber optic network transmission capacity advantage big, fireballing and data synchronization technology to obtain the synchrodata of strange land traction substation, the trend distribution character of the passive network according to electrical network and electric railway through electric power system composition and the unloaded boundary (all there were significant differences for the numerical values recited of the two and power-factor angle) with load of the through electric power system of electric railway, with the unloaded trend value of the through electric power system of electric railway or no-load current value for designated value, a traction substation is selected (to be designated as electric substation TS₀) for reference, it is judged that whether this system is in Light Condition, and tripping euqalizing current forms the chopper in the minimal cut set in loop when zero load, thus eliminating euqalizing current。

Compared with prior art, the invention has the beneficial effects as follows:

One, whether this system that can accurately judge of the present invention is in Light Condition, and tripping euqalizing current forms the chopper in the minimal cut set in loop when zero load。

Two, the present invention can effectively eliminate under the through electric power system Light Condition of electric railway with electrical network formed euqalizing current。

Three, present configuration is simple, and superior performance, advanced technology, method are reliable, it is easy to implement。

Accompanying drawing explanation

Fig. 1 is the through electric power system zero load supervising device structural representation of the embodiment of the present invention。

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the invention will be further described。

Embodiment: Fig. 1 illustrates the through electric power system structural representation of the embodiment of the present invention。The system zero load supervising device of the through power supply of a kind of electric railway, for the through electric power system of electric railway being made up of Traction networks OCS and n seat traction substation；The former limit of main converter MT of traction substation connects three phase network ABC, secondary limit is connected to Traction networks OCS through traction bus TB, tractive feeder F and feeder breaker K and feeder current transformer CT thereof, and the Traction networks OCS between each traction substation is connected to implement electric railway with connecting power supply；The main converter MT of traction substation is generally tractive transformer or the assembly of tractive transformer and compensation device；In figure, L1, L2, L3 are train；A traction substation is selected to be designated as electric substation TS₀, all the other traction substations are designated as electric substation TS_i, i=1 ..., n-1, n >=2；Described unloaded supervising device is by electric substation TS₀Watch-dog SU, electric substation TS₀Feeder current transformer CT₀, fiber optic network FO and each electric substation TS_iFeeder breaker K_iComposition；The input of watch-dog SU connects electric substation TS₀Feeder current transformer CT₀Measurement end MU, the outfan of watch-dog SU is connected to each electric substation TS through fiber optic network FO_iFeeder breaker K_iControl end CU_i, as shown in phantom in Figure 1, arrow represents information flow direction。

Another object of the present invention is realized by technical scheme once: the system zero load monitoring method of the through power supply of a kind of electric railway is: as electric substation TS₀Watch-dog SU by feeder current transformer CT₀When the tractive feeder electric current that measurement end detects is less than or equal to designated value, watch-dog SU is through fiber optic network FO output order to each electric substation TS_iFeeder breaker K_iControl end CU_iMake feeder breaker K_iTripping operation, otherwise each electric substation TS_iFeeder breaker K_iMaintenance "on" position, i=1 ..., n-1, n >=2, as shown in phantom in Figure 1。

Designated value refers to that the through electric power system of electric railway is subject to unloaded trend value when flowing or no-load current value without train, is mainly charging trend or the electric current of this through electric power system, and its numerical value is much smaller than train load。

The operation principle of the present invention is: utilize fiber optic network transmission capacity advantage big, fireballing and data synchronization technology to obtain the synchrodata of strange land traction substation, the trend distribution character of the passive network according to electrical network and electric railway through electric power system composition and the unloaded boundary with load of the through electric power system of electric railway, select a traction substation (to be designated as electric substation TS₀) for reference, it is judged that whether this system is in Light Condition, and tripping euqalizing current forms the chopper in the minimal cut set in loop when zero load。

Claims

1. the system zero load supervising device of the through power supply of electric railway, the former limit of main converter MT of each traction substation connects three phase network ABC, secondary limit is connected to Traction networks OCS through traction bus TB, tractive feeder F and feeder breaker K and feeder current transformer CT thereof, and the Traction networks OCS between each traction substation is connected to implement electric railway with connecting power supply；It is characterized in that: select a traction substation to be designated as electric substation TS₀, all the other traction substations are designated as electric substation TS_i, i=1 ..., n-1, n >=2；Unloaded supervising device includes electric substation TS₀Watch-dog SU, electric substation TS₀Feeder current transformer CT₀, fiber optic network FO and each electric substation TS_iFeeder breaker K_i；The input of watch-dog SU connects electric substation TS₀Feeder current transformer CT₀Measurement end MU, the outfan of watch-dog SU is connected to each electric substation TS through fiber optic network FO_iFeeder breaker K_iControl end CU_i。

2. the system zero load monitoring method of the through power supply of electric railway, it is characterised in that: as electric substation TS₀Watch-dog SU by feeder current transformer CT₀When measuring the end MU tractive feeder electric current detected less than or equal to designated value, watch-dog SU is through fiber optic network FO output order to each electric substation TS_iFeeder breaker K_iControl end CU_iMake feeder breaker K_iTripping operation, otherwise each electric substation TS_iFeeder breaker K_iMaintenance "on" position, i=1 ..., n-1, n >=2。

3. the system zero load supervising device of the through power supply of a kind of electric railway according to claim 1, it is characterised in that: described feeder breaker can be conventional mechanical switch, it is also possible to be electronic power switch。