CN116599059A - Multi-source traction power supply system fault section discrimination and power supply optimization method and device - Google Patents

Multi-source traction power supply system fault section discrimination and power supply optimization method and device Download PDF

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CN116599059A
CN116599059A CN202310869410.9A CN202310869410A CN116599059A CN 116599059 A CN116599059 A CN 116599059A CN 202310869410 A CN202310869410 A CN 202310869410A CN 116599059 A CN116599059 A CN 116599059A
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power supply
substation
voltage
fault
traction
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CN116599059B (en
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杨嘉琛
董志杰
魏建忠
杨凡
李波
杨振龙
侯东光
段启凡
尚国旭
赵喜军
何常红
马志远
邢晓乾
刘通
郭晓旭
钱恺逸
晏寒
常明远
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China Railway Design Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
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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
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • H02J3/0012—Contingency detection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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Abstract

The application relates to a failure section distinguishing and power supply optimizing method of a multi-source traction power supply system, which comprises the following steps: acquiring length data of a power supply arm of a traction substation along an electrified railway, and acquiring voltage and current data of a feeder line of each traction substation, wherein the sampling time interval is deltat; according to the acquired length data of the power supply arm and voltage and current data at a feeder line of the substation, a multi-source power supply electric information matrix and a structural matrix of each section are established according to the power supply sections; judging the fault type and the fault occurrence position of the power supply system through the relation between the voltage and the current at the feeder line of the substation, and forming a power supply system optimization regulation command and a voltage optimization regulation matrix; the application rapidly judges the fault type and the fault position through the electric information matrix in the multi-source power supply mode, and particularly solves the problem that the fault position is difficult to determine when a single-circuit power supply line simultaneously supplies power to two sides in the existing single-side power supply mode.

Description

Multi-source traction power supply system fault section discrimination and power supply optimization method and device
Technical Field
The application belongs to the technical field of multi-source traction power supply, and particularly relates to a method and a device for judging and optimizing power supply of a fault section of a multi-source traction power supply system.
Background
The traction power supply system in China adopts a single-phase power frequency alternating current power supply system with the voltage class of 25kV, the alternating current power traction power supply railway transportation system adopts an overhead contact network power supply mode to supply power to the train, and because the power supply system difference exists between the traction power supply system and a public power grid, the electrified railway is connected in a rotation phase sequence to ensure the three-phase balance of the power grid, and electric phase separation is arranged between adjacent power supply arms, so that the traction substation and the power supply arms independently operate as units. Because the site selection of the traction substation is influenced by multiple factors such as line trend, topography, driving organization, external power supply access and the like, especially when the line is provided with a continuously long ramp and is distributed with tunnel groups, the condition that the distance between the traction substation and the electricity is far often occurs, so that the power supply line of the traction substation supplies power to two directions of the line simultaneously, the position and the direction of a fault cannot be identified in the traditional fault ranging mode, manual investigation is needed, and adverse effects are caused on operation and maintenance. Therefore, the method for discriminating the fault section which can adapt to engineering reality is urgently needed to be provided, and along with the proposal of the topology structure of the multi-source traction power supply system, the power supply of the train enters a multi-source cooperative mode, so that a new thought is provided for a fault positioning method, and the running quality of the traction power supply system is effectively improved.
Disclosure of Invention
The application solves the technical problems by adopting the following technical scheme:
the fault section distinguishing and power supply optimizing method for the multi-source traction power supply system comprises the following steps:
obtaining electricityThe length data of a power supply arm of a traction substation along a gasification railway are obtained, voltage and current data of a feeder line of each traction substation are obtained, and sampling time intervals are as follows；
According to the acquired length data of the power supply arm and voltage and current data at a feeder line of the substation, a multi-source power supply electric information matrix and a structural matrix of each section are established according to the power supply sections;
and judging the fault type and the fault occurrence position of the power supply system according to the data relation between the voltage and the current at the feeder line of the substation, and forming a power supply system optimization regulation command and a voltage optimization regulation matrix.
Further, the power supply system fault types include a substation fault, a disconnection fault and a short circuit fault.
Further, the judging method of the short circuit fault comprises the following steps:
and judging the multisource power supply electric information matrix corresponding to a certain power supply section, and judging that a short circuit fault occurs if the sum of currents at the feeder line of the power substation for supplying power to the multisource power supply electric information matrix is increased compared with the last sampling value and exceeds a setting value.
Further, the fault occurrence position judging method of the short circuit fault comprises the following steps:
the current information when short circuit occurs is according to the relationChecking, if the relation is met, judging that the short circuit fault occurrence point is positioned in the same side power supply section; if the relation is not satisfied, judging that the short circuit fault occurrence point is positioned in the bilateral power supply section;
wherein ,representing short-circuit current at a feeder line of a traction substation at the left side of a power supply section in case of failure; />Representing short-circuit current at a feeder line of a traction substation on the right side of a power supply section in case of failure; />Representing the voltage of a feeder line of a traction substation at the left side of a power supply section during faults; />Representing the voltage of a feeder line of a traction substation on the right side of the power supply section during faults; />Representing the internal resistance of the traction substation at the left side; />Representing the internal resistance of the traction substation on the right side; />Representing the impedance of the contact net from the left substation to the normally-closed electric split phase; />Representing the impedance of the contact net from the right substation to the normally-closed electric split phase; />The equivalent impedance of a steel rail and the ground at the position from the left substation to the normally closed electric split phase is shown; />The equivalent impedance of a steel rail and the ground at the position from the right substation to the normally closed electric split phase is shown;
according to the short-circuit fault occurrence mode, the KVL equation set is written for calculation, and the calculated impedance value and the unit impedance of the contact net are calculatedAnd comparing the calculated length of the short circuit point with the structural information matrix to determine the specific position of the short circuit fault point.
Further, the method for forming the power supply system optimization adjustment command and the voltage optimization adjustment matrix after the short circuit fault comprises the following steps:
judging whether the power supply interval is shortened to continue operation according to the position of the short circuit fault point, if so, reducing the outlet voltage of the substation according to the length of the shortened power supply arm after the fault to form a voltage optimization adjustment matrix.
Further, the method for judging the faults of the substation comprises the following steps:
judging the voltage at the feeder line of a substation in a multisource power supply electric information matrix of a power supply section, if the voltage at the feeder line of the substation is reduced to below 19kV, judging that the substation fault occurs, and exiting the operation of a traction substation with reduced voltage, wherein the section enters a cross-region power supply mode supported by adjacent traction substation;
and lifting the outlet voltage of the adjacent power substation according to the length of the cross-region power supply arm to form a voltage optimization adjustment matrix.
Further, the judging method of the broken line fault comprises the following steps:
judging a multisource power supply electrical information matrix corresponding to a certain power supply section, if the voltage at the feeder line of the substation is the same as the voltage at the feeder line of the substation、/>The variation range of (2) is 19kV-29kV, and the sum of current is +.>No obvious change, but the current in the feeder line of the substation is +>、/>If the power supply is suddenly changed, judging that the disconnection fault occurs, and returning the system from the multi-source power supply mode to the single-side power supply mode, and directly stopping the operation of the system for safety.
The utility model provides a multisource pulls power supply system fault section judgement and power supply optimizing device, includes:
the data acquisition module is used for acquiring the length data of the power supply arm of the traction substation along the electrified railway and acquiring the voltage and the voltage of the feeder line of each traction substationCurrent data, sampling time interval of；
The multi-source power supply electric information matrix and structure matrix establishing module is used for establishing a multi-source power supply electric information matrix and a structure matrix of each section according to the acquired power supply arm length data and voltage and current data at a feeder line of the substation and the power supply sections;
the fault judging and power supply system optimizing and adjusting module is used for judging the fault type and the fault occurrence position of the power supply system through the relation between the voltage and the current data at the feeder line of the substation and forming a power supply system optimizing and adjusting command and a voltage optimizing and adjusting matrix.
An electronic device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the multi-source traction power supply system fault section discrimination and power supply optimization method.
A computer readable storage medium storing a computer program which when executed by a processor implements the method for discriminating and optimizing a failure zone of a multi-source traction power supply system.
The application has the advantages and positive effects that:
according to the application, the fault type and the fault position are rapidly judged through the electric information matrix in the multi-source power supply mode, and particularly, the problem that the fault position is difficult to measure when the single-circuit power supply line supplies power to two sides simultaneously in the existing single-side power supply mode is solved, the intelligent fault judgment level and the post-fault adjustment capability of the traction power supply system are improved, and the operation quality of the traction power supply system is ensured.
Drawings
The technical solution of the present application will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for the purpose of illustration only and thus are not limiting the scope of the present application. Moreover, unless specifically indicated otherwise, the drawings are intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 (a) is a block diagram of a conventional mode multi-mode traction power system operation provided by an embodiment of the present application;
FIG. 1 (b) is a block diagram of a multi-source traction power supply system in a traction station and electric phase separation position inconsistency mode according to an embodiment of the present application;
fig. 2 (a) is a block diagram of faults occurring between traction substations according to an embodiment of the present application;
fig. 2 (b) is a structural diagram of faults provided by the embodiment of the present application occurring on the same side of a traction substation;
fig. 3 (a) is a circuit diagram of faults occurring between traction substations according to an embodiment of the present application;
fig. 3 (b) is a circuit diagram of a fault provided by an embodiment of the present application occurring on the same side of a traction substation;
FIG. 4 (a) is a schematic diagram of a post-fault power supply structure according to an embodiment of the present application;
FIG. 4 (b) is a schematic diagram of a power supply section shortened after failure according to an embodiment of the present application;
fig. 5 is a schematic diagram of data transmission processing between traction substations according to an embodiment of the present application;
fig. 6 is a flowchart of a method for discriminating and optimizing power supply for a fault section of a multi-source traction power supply system according to an embodiment of the present application.
Detailed Description
First, it should be noted that the following detailed description of the specific structure, characteristics, advantages, and the like of the present application will be given by way of example, however, all descriptions are merely illustrative, and should not be construed as limiting the present application in any way. Furthermore, any single feature described or implied in the embodiments mentioned herein, or any single feature shown or implied in the figures, may nevertheless be continued in any combination or pruning between these features (or equivalents thereof) to obtain still further embodiments of the application that may not be directly mentioned herein. In addition, for the sake of simplicity of the drawing, identical or similar features may be indicated at one point in the same drawing.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
Example 1
As shown in fig. 6, the method for discriminating and optimizing power supply failure sections of a multi-source traction power supply system according to the present embodiment includes the following steps:
acquiring length data of a power supply arm of a traction substation along an electrified railway, and acquiring voltage and current data of a feeder line of each traction substation, wherein sampling time intervals are as follows；
According to the acquired length data of the power supply arm and the voltage and current data at the feeder line of the substation, a multi-source power supply electric information matrix of each section is established according to the power supply sectionsAnd a structural matrix;
and judging the fault type and the fault occurrence position of the power supply system according to the data relation between the voltage and the current at the feeder line of the substation, and forming a power supply system optimization regulation command and a voltage optimization regulation matrix.
The power supply system fault type comprises a substation fault, a disconnection fault and a short circuit fault; specific:
the judging method of the short circuit fault comprises the following steps:
multisource power supply electrical information matrix for a certain power supply sectionJudging if the sum of currents at feeder lines of the power substation for supplying power to the power station is +.>If the sampling value is increased and exceeds the setting value, judging that a short circuit fault occurs;
the setting value is a set value when the relay protection device performs protection action, namely when the sampling value in the protected system is measured to exceed the set value, the relay protection device performs protection action, and the safe operation of the system is ensured; the setting value mentioned in the embodiment refers to a current value set by the relay protection device of the traction power supply system according to the short-circuit current of the system, and when the current value in the measurement system exceeds the set value, the relay protection device performs protection action, namely cuts off a power supply loop, so that the safety of equipment in the system is ensured; the setting value is generally calculated according to the circuit structure, and is approximately in the order of thousands of amperes, and some areas with large external power supply capacity also have more than 1 ten thousand amperes, and the setting value is calculated according to the circuit structure and is basic knowledge in power system analysis, so that the setting value belongs to common knowledge for a person skilled in the art.
As shown in fig. 3 (a) and 3 (b), the fault occurrence position determining method of the short-circuit fault is as follows:
the current information when short circuit occurs is according to the relationChecking, if the relation is met, judging that the short circuit fault occurrence point is positioned in the same side power supply section; if the relation is not satisfied, judging that the short circuit fault occurrence point is positioned in the bilateral power supply section;
wherein ,short-circuit current at feeder line of traction substation at left side of power supply section in case of fault is represented, namely multisource power supply electric information matrix in case of short-circuit fault>Middle->Is a value of (2); />Short-circuit current at the feeder line of the traction substation on the right side of the power supply section in case of faults is represented, namely a multisource power supply electric information matrix in case of short-circuit faults>In (a)Is a value of (2); />Representing the voltage of a feeder line of a traction substation at the left side of a power supply section during faults; />Representing the voltage of a feeder line of a traction substation on the right side of the power supply section during faults; />Representing the internal resistance of the traction substation at the left side; />Representing the internal resistance of the traction substation on the right side; />Representing the impedance of the contact net from the left substation to the normally-closed electric split phase; />Representing the impedance of the contact net from the right substation to the normally-closed electric split phase; />The equivalent impedance of a steel rail and the ground at the position from the left substation to the normally closed electric split phase is shown; />The equivalent impedance of a steel rail and the ground at the position from the right substation to the normally closed electric split phase is shown;
according to the short-circuit fault occurrence mode, the KVL equation set is written for calculation, and the calculated impedance value (Z 2-1 and Z2-2 The contact network impedance from the fault point to the traction substation at two sides is respectively represented, and the corresponding mode 2-the short circuit fault occurrence point is positioned in the bilateral power supply section; z is Z 3-1 Representing the impedance from the fault point to the nearest traction substation contact net, corresponding to the mode 1-shortThe occurrence point of the road fault is positioned in the same side power supply section) and the unit impedance Z of the contact net 0 Comparing the calculated length of the short circuit point with the structural information matrix to determine the specific position of the short circuit fault point; judging whether the power supply interval is shortened to continue operation according to the position of the short circuit fault point, if so, reducing the outlet voltage of the substation according to the length of the shortened power supply arm after the fault to form a voltage optimization adjustment matrix.
In detail, the power supply section is simultaneously supplied by two adjacent traction substations, and the traction substations are generally consistent with the electric phase separation position, and when a short circuit fault occurs, the power supply network can be represented by fig. 1 (a). When the traction substation is not in the same location as the electricity phase, the power supply network may be represented by fig. 1 (b);
therefore, the short-circuit fault mode can be divided into two modes according to the occurrence position, wherein the mode 1 is that the fault occurs in the bilateral power supply section, and the mode 2 is that the fault occurs in the same-side power supply section, and the modes are respectively represented by fig. 2 (a) and 2 (b);
for mode 1, as in fig. 3 (a), the equation can be established:
wherein ,representing short circuit current at the short circuit point; />Representing the impedance of the contact net at the short circuit point of the right substation; />Representing the contact net impedance from the short circuit point to the normally-closed electric phase division point; />Representing the equivalent impedance of the steel rail and the ground at the short-circuit point of the right transformer substation; />Indicating the short circuit point to be normalRail and earth equivalent impedance at closed electric split phase;
for mode 2, as in fig. 3 (b), the equation can be established:
wherein ,representing short circuit current at the short circuit point; />Representing the impedance of the contact net at the short circuit point of the right substation; />Representing the equivalent impedance of the steel rail and the ground at the short-circuit point of the right transformer substation;
in the mode(s) of operation in mode 1, and />Independently of each other, in mode 2, +.> and />Are not independent of each other and have the relation->；
Therefore, the short-circuit current information monitored in the electrical information matrix can be determined first, and if the relation is satisfied, the fault mode 2 is determined and calculatedAnd unit impedance->Comparison can be made to obtain +.>The length value (if the equivalent impedance between the rail and the ground is not ignored, the equivalent impedance between the rail and the ground is substituted>Comparing the short circuit fault points with the structural information matrix for checking, and determining the positions of the short circuit fault points;
if the relation is not satisfied, determining that the failure mode is 1, and calculating to obtain and />Is equal to the unit impedance->After comparison, +.>、/>The length value (if the equivalent impedance between the rail and the ground is not ignored, the equivalent impedance between the rail and the ground is substituted>Comparing the short circuit fault points with the structural information matrix for checking, and determining the positions of the short circuit fault points;
judging whether the power supply interval is shortened to continue operation according to the position of the short circuit fault point, if so, reducing the outlet voltage of the substation according to the length of the shortened power supply arm after the fault to form a voltage optimization adjustment matrixThe control module sends the power to a PWM module in the traction substation, so that the electric energy loss is reduced;
the data exchange among the traction substations in the multi-source power supply range is wireless transmission, the traction substations perform data processing, and an adjusting instruction is sent out to be synchronous to each traction substation according to the data processing result.
The method for judging the faults of the substation comprises the following steps:
judging the voltage at the feeder line of a substation in a multi-source power supply electric information matrix of a power supply section, if the voltage at the feeder line of the substation is reduced to below 19kV and does not meet the operating voltage range (TB 10009-2016) of the electrified railway, judging that the substation is in fault, and the traction substation with reduced voltage is out of operation, wherein the section enters a cross-region power supply mode, as shown in fig. 4 (a);
and lifting the voltage at the outlet of the substation according to the length of the power supply arm of the cross region to form a voltage optimization adjustment matrix, and sending the voltage optimization adjustment matrix to a PWM (pulse-Width modulation) module in the traction substation by a control module to enhance the power supply capacity of the cross region mode.
The judging method of the broken line fault comprises the following steps:
multi-source power supply electric information matrix corresponding to certain power supply sectionJudging if the voltage of the feeder line of the substation is +.>、/>The variation range of (a) is within a normal range (TB 10009-2016, a supply voltage range is 19kV-29 kV), and the sum of currents is +.>No obvious change, but the current in the feeder line of the substation is +>、/>If the power supply is suddenly changed, judging that the disconnection fault occurs, and returning the system from the multi-source power supply mode to the single-side power supply mode, and directly stopping the operation of the system for safety.
Example 2
In this embodiment, the implementation process of the method for discriminating the failure section and optimizing the power supply capacity of the multi-source traction power supply system is as follows:
as shown in fig. 1 (a), 1 (b), 2 (a), and 2 (b), the traction substation SS is configured to 1 And traction substation SS 2 Multiple source power supply section, SS 1 Feeder line outlet current I 1 ，SS 2 Feed-out current I 2 Fig. 1 (a) shows a normal mode when the traction substation is consistent with the electric split-phase position, fig. 1 (b) shows a special mode when the traction substation is inconsistent with the electric split-phase position, and according to the operation structure of the traction power supply system in the drawing, the short-circuit fault position can be divided into a position between two adjacent traction substations and a position on the same side of the two adjacent traction substations, as shown in fig. 2 (a) and 2 (b) respectively; since FIG. 1 (b) includes both the dual-side power supply section (L 1 、L 2 ) With the same-side power supply section (L 3 ) Therefore, the short-circuit fault position determination is described with the circuit configuration of fig. 1 (b).
According to the structure of the multi-source traction power supply system, the power supply section shown in fig. 1 (b) is powered by a power supply SS of 2 traction substation 1 、SS 2 The power supply section can be divided into 3 parts L 1 、L 2 、L 3, wherein L1 、L 2 For bilateral power supply section, L 3 The same side is supplied with power for the section.
First, a structure information matrix L is formed in the system shown in FIG. 1 (b) 1 ,L 2 ,L 3 ]Acquisition of SS 1 、SS 2 The current and voltage data at the feeder line of (2) are updated by cyclic sampling, and the sampling time interval is as followsThe method comprises the steps of carrying out a first treatment on the surface of the SS will be described 1 、SS 2 The power supply section in between is regarded as a multi-source power supply section, and a multi-source power supply electric information matrix is formed>。
The short-circuit fault section is identified as follows:
when the contact net is tripped by a short circuit fault,
the first step: judging current informationSum->Obviously increases and exceeds a setting value, which indicates that the power supply section of the traction substation has a contact network short circuit fault;
and a second step of: current information when short circuit will occurRecording a short-circuit current matrix->As shown in FIGS. 3 (a), 3 (b), in FIG. 3 (a), I 1d and I2d Independently of each other, in 3 (b), I 1d And I 2d Not independent of each other, will I 1d and I2d The values of (2) are according to the relation->Checking, if yes, judging that the short circuit fault occurrence point is positioned in the same side power supply section L 3 An inner part; if not, judging that the short circuit fault occurrence point is positioned in the bilateral power supply section L 1 、L 2 An inner part;
and a third step of: selecting a calculation formula according to a short circuit mode:
if the short circuit fault is located in the same side power supply section,
solving Z according to formula 3-1 ；
If the short circuit fault is located in the dual-sided power section,
solving for Z according to the above formula 2-1 and Z2-2 ；
Fourth step: will Z 3-1 、Z 2-1 、Z 2-2 And contact net unit impedance Z 0 The calculated length of the short-circuit point is obtained by comparison (if the equivalent impedance between the steel rail and the ground is not ignored, the equivalent impedance Z between the steel rail and the ground is substituted E0 Comparing the short circuit fault points with the structural information matrix to determine specific positions of the short circuit fault points;
fifth step: judging whether the system shortens the power supply interval to continue to operate according to the specific position of the short circuit fault point; for example, if the fault point is located at L 1 Within the segment, the SS may be opened 1 And SS (support) 2 The electric phase-splitting normally-closed switch between the two switches can degrade the system into a single-side power supply operation mode L 2 、L 3 The power supply section is not affected by faults; correspondingly, the fault point is located at L 2 、L 3 Within the segment, the SS may be opened 1 And SS (support) 2 The electric phase-splitting normally-closed switch between the two switches can degrade the system into a single-side power supply operation mode L 1 The power supply section is not affected by faults;
sixth, as shown in FIG. 4 (b), if the system meets the condition of shortening the power supply interval and continuing the operation, the traction station SS is lowered 1 、SS 2 Forms a voltage optimization adjustment matrix according to the length of the shortened power supply arm after the fault and sends the voltage optimization adjustment matrix to the SS by a control module 1 、SS 2 And the PWM module in the traction substation reduces the electric energy loss of the system.
As shown in fig. 5, the data exchange between the traction substations adopts wireless transmission, voltage and current data are collected in real time and transmitted into the device for data processing, and the data are sent to the traction substation PWM module according to the data processing result; when the faulty section is cut off, the power supply can be restored immediately.
The application relates to a method for judging a fault section and optimizing power supply capacity of a multi-source traction power supply system, which is realized by depending hardware structures comprising the following steps: the power module, the CPU module, the control module and the wireless communication module are connected with the internal connection module; the power module takes electricity from the traction alternating current screen or the direct current screen to provide electric energy for the whole equipment; the CPU module is connected with a data interface in the traction station; the internal connection module comprises a power supply and a data communication channel between the modules; the control module is connected with the PWM module; the power module, the CPU module, the control module and the communication module are all connected with the internal connection module, so that the sharing of the internal power supply of the equipment and the data interaction are realized. The CPU module is a commercial universal module, the embedded system board card and the CPU main card and the standby card are identical.
The power substation is a power supply of the whole system, the power phase is similar to a device for dividing the power supply range of the power supply, normally closed operation is performed through a parallel switch in a multi-source power supply system, the power substation is only put into use when faults occur, and the power supply influence range is shortened. The voltage and the current in different power supply sections of the traction power supply system form the power distribution of the whole power supply network, namely the power flow distribution, and the fault type and the fault position are rapidly judged by analyzing the matrix and calculating the power flow, so that the problem that the fault position is difficult to determine when a single-circuit power supply line supplies power to two sides simultaneously in the existing single-side power supply mode is solved, the intelligent fault judgment level and the post-fault adjustment capability of the traction power supply system are improved, and the operation quality of the traction power supply system is ensured.
Example 3
Based on the same inventive concept, the embodiment of the application also provides a device for discriminating and optimizing power supply of a failure section of a multi-source traction power supply system, which comprises the following steps:
the data acquisition module is used for acquiring the length data of the power supply arm of the traction substation along the electrified railway, and acquiring the voltage and current data of the feeder line of each traction substation, wherein the sampling time interval is as follows；
The multi-source power supply electric information matrix and structure matrix establishing module is used for establishing a multi-source power supply electric information matrix and a structure matrix of each section according to the acquired power supply arm length data and voltage and current data at a feeder line of the substation and the power supply sections;
the fault judging and power supply system optimizing and adjusting module is used for judging the fault type and the fault occurrence position of the power supply system through the relation between the voltage and the current data at the feeder line of the substation and forming a power supply system optimizing and adjusting command and a voltage optimizing and adjusting matrix.
Based on the same inventive concept, the embodiment of the application also provides an electronic device, which comprises: at least one processor; and a memory communicatively coupled to the at least one processor; the storage stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can execute the multi-source traction power supply system fault section distinguishing and power supply optimizing method; it should be noted that the electronic device may include, but is not limited to, a processing unit, a storage unit; those skilled in the art will appreciate that the inclusion of a processing unit, a storage unit, and a memory unit in an electronic device is not limiting of a computing device, and may include additional components, or may combine certain components, or different components, e.g., an electronic device may also include an input-output device, a network access device, a bus, etc.
A computer readable storage medium storing a computer program which when executed by a processor implements the above-described multi-source traction power supply system fault section discrimination and power supply optimization method; the readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing; the program embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing. For example, program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the C programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, or entirely on a remote computing device or server. In the case of remote computing devices, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., connected over the Internet using an Internet service provider).
The foregoing examples illustrate the application in detail, but are merely preferred embodiments of the application and are not to be construed as limiting the scope of the application. All equivalent changes and modifications within the scope of the present application are intended to be covered by the present application.

Claims (10)

1. The method for discriminating and optimizing the power supply of the failure section of the multi-source traction power supply system is characterized by comprising the following steps:
acquiring length data of a power supply arm of a traction substation along an electrified railway, and acquiring voltage and current data of a feeder line of each traction substation, wherein sampling time intervals are as follows；
According to the acquired length data of the power supply arm and voltage and current data at a feeder line of the substation, a multi-source power supply electric information matrix and a structural matrix of each section are established according to the power supply sections;
and judging the fault type and the fault occurrence position of the power supply system according to the data relation between the voltage and the current at the feeder line of the substation, and forming a power supply system optimization regulation command and a voltage optimization regulation matrix.
2. The method for discriminating and optimizing power supply failure zone of a multi-source traction power supply system according to claim 1, wherein: the power supply system fault types comprise a substation fault, a disconnection fault and a short circuit fault.
3. The method for discriminating and optimizing power supply failure zone of a multi-source traction power supply system according to claim 2 wherein said method for discriminating short circuit failure is:
and judging the multisource power supply electric information matrix corresponding to a certain power supply section, and judging that a short circuit fault occurs if the sum of currents at the feeder line of the power substation for supplying power to the multisource power supply electric information matrix is increased compared with the last sampling value and exceeds a setting value.
4. The method for discriminating and optimizing power supply for a fault section of a multi-source traction power supply system according to claim 3 wherein said method for discriminating a fault occurrence position of a short-circuit fault is:
the current information when short circuit occurs is according to the relationChecking, if the relation is met, judging that the short circuit fault occurrence point is positioned in the same side power supply section; if the relation is not satisfied, judging that the short circuit fault occurrence point is positioned in the bilateral power supply section;
wherein ,representing short-circuit current at a feeder line of a traction substation at the left side of a power supply section in case of failure; />Representing short-circuit current at a feeder line of a traction substation on the right side of a power supply section in case of failure; />Representing the voltage of a feeder line of a traction substation at the left side of a power supply section during faults; />Representing the voltage of a feeder line of a traction substation on the right side of the power supply section during faults; />Representing the internal resistance of the traction substation at the left side;representing the internal resistance of the traction substation on the right side; />Representing the impedance of the contact net from the left substation to the normally-closed electric split phase; />Representing the impedance of the contact net from the right substation to the normally-closed electric split phase; />The equivalent impedance of a steel rail and the ground at the position from the left substation to the normally closed electric split phase is shown; />The equivalent impedance of a steel rail and the ground at the position from the right substation to the normally closed electric split phase is shown;
according to the short-circuit fault occurrence mode, the KVL equation set is written for calculation, and the calculated impedance value and the unit impedance of the contact net are calculatedAnd comparing the calculated length of the short circuit point with the structural information matrix to determine the specific position of the short circuit fault point.
5. The method for discriminating and optimizing power supply sections of a multi-source traction power supply system according to claim 4 wherein said method for forming said power supply system optimized regulation command and voltage optimized regulation matrix after said short-circuit fault is:
judging whether the power supply interval is shortened to continue operation according to the position of the short circuit fault point, if so, reducing the outlet voltage of the substation according to the length of the shortened power supply arm after the fault to form a voltage optimization adjustment matrix.
6. The method for discriminating and optimizing power supply failure zone of a multi-source traction power supply system according to claim 2, wherein the method for discriminating power substation failure is as follows:
judging the voltage at the feeder line of a substation in a multisource power supply electric information matrix of a power supply section, if the voltage at the feeder line of the substation is reduced to below 19kV, judging that the substation fault occurs, and exiting the operation of a traction substation with reduced voltage, wherein the section enters a cross-region power supply mode supported by adjacent traction substation;
and lifting the outlet voltage of the adjacent power substation according to the length of the cross-region power supply arm to form a voltage optimization adjustment matrix.
7. The method for discriminating and optimizing power supply failure zone of a multi-source traction power supply system according to claim 2 wherein said method for discriminating a broken line failure is:
judging a multisource power supply electrical information matrix corresponding to a certain power supply section, if the voltage at the feeder line of the substation is the same as the voltage at the feeder line of the substation、The variation range of (2) is 19kV-29kV, and the sum of current is +.>No obvious change but current at feeder line of power substation、/>If the power supply is suddenly changed, judging that the disconnection fault occurs, and returning the system from the multi-source power supply mode to the single-side power supply mode, and directly stopping the operation of the system for safety.
8. The utility model provides a multisource pulls power supply system fault section judgement and power supply optimizing device which characterized in that includes:
the data acquisition module is used for acquiring the length data of the power supply arm of the traction substation along the electrified railway, and acquiring the voltage and current data of the feeder line of each traction substation, wherein the sampling time interval is as follows；
The multi-source power supply electric information matrix and structure matrix establishing module is used for establishing a multi-source power supply electric information matrix and a structure matrix of each section according to the acquired power supply arm length data and voltage and current data at a feeder line of the substation and the power supply sections;
the fault judging and power supply system optimizing and adjusting module is used for judging the fault type and the fault occurrence position of the power supply system through the relation between the voltage and the current data at the feeder line of the substation and forming a power supply system optimizing and adjusting command and a voltage optimizing and adjusting matrix.
9. An electronic device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 7.
10. A computer readable storage medium storing a computer program which, when executed by a processor, implements the method of any one of claims 1 to 7.
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