CN114407734B - Flexible traction power supply system and protection method - Google Patents

Flexible traction power supply system and protection method Download PDF

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Publication number
CN114407734B
CN114407734B CN202111575296.6A CN202111575296A CN114407734B CN 114407734 B CN114407734 B CN 114407734B CN 202111575296 A CN202111575296 A CN 202111575296A CN 114407734 B CN114407734 B CN 114407734B
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breaker
traction transformer
fault
flexible traction
transformer
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CN114407734A (en
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何晓琼
黄通跃
韩鹏程
曾理
刘育阳
韩正庆
高仕斌
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Southwest Jiaotong University
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Southwest Jiaotong University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60MPOWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M3/00Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50Arrangements for eliminating or reducing asymmetry in polyphase networks

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  • Mechanical Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a flexible traction power supply system and a protection method, the system comprises a first flexible traction transformer, a first existing traction transformer, a second flexible traction transformer and a second existing traction transformer, wherein the first existing traction transformer, the first flexible traction transformer, the second flexible traction transformer and the second existing traction transformer are sequentially arranged and connected to a bus through corresponding circuit breakers, the system further comprises circuit breakers QF4, a circuit breaker QF5, a circuit breaker QF5' and a circuit breaker QF4 ', the circuit breakers QF4 and the circuit breaker 5 are respectively positioned on two sides of an electrical phase splitting a, the circuit breaker QF5 and the circuit breaker QF5' are respectively positioned on two sides of an electrical phase splitting b, and the circuit breakers QF5' and the QF4 ' are respectively positioned on two sides of an electrical phase splitting c to realize through power supply of power supply arms on two sides of the electrical phase splitting c, thereby solving the problems of reactive power, reactive power and reactive power existing in the existing traction power supply system, Negative sequence and harmonic power quality problems, and improved power supply capability.

Description

Flexible traction power supply system and protection method
Technical Field
The invention belongs to the technical field of traction power supply, and particularly relates to a flexible traction power supply system and a protection method.
Background
At present, a three-phase-two-phase power supply mode is basically adopted for an electrified railway traction power supply system in the world, a substation obtains electricity from a three-phase power grid through a traction transformer, reduces the voltage and outputs the electricity through two power supply arms, and therefore power is supplied to the traction grid.
Therefore, how to reduce or even cancel an electric phase splitting device in a traditional railway traction power supply system and solve the problems of low electric energy quality and poor power supply capacity of the traditional railway traction power supply system, and how to improve the power supply reliability of the flexible traction power supply system and provide a proper comprehensive protection method for the flexible traction power supply system is a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide a flexible traction power supply system and a protection method in order to reduce or even cancel an electric phase splitting device in a traditional railway traction power supply system and improve the electric energy quality and the power supply capacity.
The technical scheme of the invention is as follows: a flexible traction power supply system, the system comprising:
the system comprises a first flexible traction transformer, a second flexible traction transformer and a third flexible traction transformer, wherein the first flexible traction transformer comprises a breaker QF6, a first energy-saving traction transformer, a breaker QF8, a first matching transformer, a first three-phase-single-phase converter and a breaker QF10 which are sequentially connected, the primary side three phase of the first energy-saving traction transformer is connected with a three-phase power grid through the breaker QF6, the secondary side three phase of the first energy-saving traction transformer is connected with the primary side three phase of the first matching transformer through a breaker QF8, the secondary side of the first matching transformer is connected with the input end of the first three-phase-single-phase converter, and the output end of the first three-phase-single-phase converter is connected with a bus A through the breaker QF 10;
the system comprises a first existing traction transformer, a second existing traction transformer and a third existing traction transformer, wherein the input end of the first existing traction transformer is connected with a three-phase power grid through a breaker QF1, the first output end of the first existing traction transformer is connected with a bus A through a breaker QF2, and the second output end of the first existing traction transformer is connected with a bus B through a breaker QF 3;
the second flexible traction transformer comprises a breaker QF6', a second energy-saving traction transformer, a breaker QF8', a second matching transformer, a second three-phase single-phase converter and a breaker QF10' which are sequentially connected, wherein the primary side three phase of the second energy-saving traction transformer is connected with a three-phase power grid through the breaker QF6', the secondary side three phase of the second energy-saving traction transformer is connected with the primary side three phase of the second matching transformer through the breaker QF8', the secondary side of the second matching transformer is connected with the input end of the second three-phase single-phase converter, and the output end of the second three-phase single-phase converter is connected with a bus A ' through the breaker QF10 ';
the input end of the second existing traction transformer is connected with the three-phase power grid through a breaker QF1 ', the first output end of the second existing traction transformer is connected with the bus A ' through a breaker QF2 ', and the second output end of the second existing traction transformer is connected with the bus B ' through a breaker QF3 ';
the first existing traction transformer, the first flexible traction transformer, the second flexible traction transformer and the second existing traction transformer are sequentially connected to a bus in an arrayed manner;
the system further comprises a breaker QF4, a breaker QF5, a breaker QF5' and a breaker QF4 ', the breaker QF4 and the breaker QF5 are respectively located on two sides of the electric phase separation a, the breaker QF5 and the breaker QF5' are respectively located on two sides of the electric phase separation b, the breaker QF5' and the breaker QF4 ' are respectively located on two sides of the electric phase separation c, the electric phase separation a and the electric phase separation c are respectively an electric phase separation in the flexible traction substation 1 and the flexible traction substation 2, the electric phase separation b is an electric phase separation between the flexible traction substation 1 and the flexible traction substation 2, the electric phase separation a is connected with the breaker QF11 in parallel, and the breaker QF12 is connected with the electric phase separation b in parallel.
Further, the first energy-saving traction transformer is also connected with the bus A and the bus B through a breaker QF7, and the second energy-saving traction transformer is also connected with the bus A ' and the bus B ' through QF7 '.
The invention also provides a protection method of the flexible traction power supply system, which is applied to the flexible traction power supply system and comprises the following steps:
s1, real-time monitoring of system circulation, electrical quantities of all parts of the system, working states of all circuit breakers and protection action signals, wherein the working states comprise tripping and closing, the electrical quantities of all parts of the system comprise voltage and current quantities of all circuit breakers, and the protection action signals comprise protection actions and protection inactions;
s2, determining fault equipment based on system circulation, electrical quantities of all parts of the system, working states of all circuit breakers and protection action signals;
and S3, controlling each breaker according to the fault equipment.
Further, in step S2, determining the faulty device based on the system loop current, the electrical quantities at various locations of the system, the operating states of the circuit breakers, and the protection operation signal specifically includes:
if the system circulation is greater than a preset maximum limit value, the system is failed to be connected to the grid;
if the system has protection actions, the circuit breaker QF10 and the circuit breaker QF8 or the circuit breaker QF6 and the circuit breaker QF8 trip, and the circuit breaker QF10', the QF6', the circuit breaker QF5', the circuit breaker QF5 and the circuit breaker QF8' are closed, the fault is the fault of the first flexible traction transformer;
if the system has protection action, the breaker QF10' and the breaker QF8' or the breaker QF6' and the breaker QF8' trip, and the breaker QF5', the breaker QF5, the breaker QF6, the breaker QF8 and the breaker QF10 are closed, the system is a second flexible traction transformer fault;
if the system has protection action, the breaker QF10 trips to a breaker QF5, and when the breaker QF5', the breaker QF10', the breaker QF6', the breaker QF8', the breaker QF8 and the breaker QF6 are closed, the bus fault at the first flexible traction transformer is detected;
if the system has protection actions, the breaker QF10 'and the breaker QF5' trip, and the breaker QF5, the breaker QF10, the breaker QF6, the breaker QF8, the breaker QF8 'and the breaker QF6' are all closed, the bus fault at the second flexible traction transformer is detected;
if the system has a protection action, when the breaker QF10, the breaker QF8, the breaker QF10 'and the breaker QF8' trip and the breaker QF5 and the breaker QF5 'are closed, or when the system has a protection action, the breaker QF6', the breaker QF8', the breaker QF6 and the breaker QF8 trip and the breaker QF5 and the breaker QF5' close, or when the system has a protection action, the breaker QF6', the breaker QF8', the breaker QF8 and the breaker QF10 trip and the breaker QF5 and the breaker QF5 'close, or when the system has a protection action, the breaker QF8', the breaker QF10', the breaker QF6 and the breaker QF8 trip and the breaker QF5 and the breaker QF5' close, the first flexible traction transformer and the second flexible traction transformer both fail;
if the system has protection actions, the breaker QF10 trips to the breaker QF5, the breaker QF5', the breaker QF6 and the breaker QF8 are closed, and meanwhile, the breaker QF10' trips to the breaker QF8', or if the system has protection actions, when the breaker QF6' trips to the breaker QF8', the system is in bus fault at the first flexible traction transformer and fault at the second flexible traction transformer;
if the system has protection actions, the breaker QF10 'trips with the breaker QF5' and the breaker QF5, the breaker QF6 'and the breaker QF8' are closed, and meanwhile, the breaker QF10 trips with the breaker QF8, or the breaker QF6 trips with the breaker QF8, the fault is the fault of the first flexible traction transformer and the fault of the bus at the second flexible traction transformer;
if the system has protection actions, when the breaker QF10, the breaker QF5, the breaker QF5 'and the breaker QF10' trip and the breaker QF6, the breaker QF6', the breaker QF8 and the breaker QF8' are closed, the bus at the first flexible traction transformer fails and the bus at the second flexible traction transformer fails;
and if the electric quantity at the breaker QF5 or the breaker QF5 'reaches a set protection action value and meets the fault direction condition, and meanwhile, the breaker QF10, the breaker QF10', the breaker QF6, the breaker QF6', the breaker QF8 and the breaker QF8' are closed and no protection action signal is sent, the fault of the contact network is determined.
Further, the step S3 is specifically as follows:
if the fault is grid connection failure of the system, the breaker QF12 is disconnected, the first flexible traction transformer supplies power for the power supply arms between the split phase a and the split phase b and on the left side of the split phase a, and the second flexible traction transformer supplies power for the power supply arm on the right side of the split phase b;
if the fault is the fault of the first flexible traction transformer, closing the circuit breaker QF1 and the circuit breaker QF 2;
if the fault is the fault of the second flexible traction transformer, closing the circuit breaker QF 2';
if the fault is a bus fault at the first flexible traction transformer, controlling the second flexible traction transformer to supply power for a system run-through power supply section;
if the fault is a bus fault at the second flexible traction transformer, controlling the first flexible traction transformer to supply power for a system through power supply section;
if the faults are faults of both the first flexible traction transformer and the second flexible traction transformer, both the breaker QF11 and the breaker QF12 are disconnected, so that the system returns to the existing traction power supply state;
if the fault is a bus fault at the first flexible traction transformer and a fault of the second flexible traction transformer, closing a breaker QF 2' to enable the second existing traction transformer to supply power for the through power supply section;
if the fault is the fault of the first flexible traction transformer and the bus fault of the second flexible traction transformer, closing the circuit breaker QF1, the circuit breaker QF2, the circuit breaker QF3 and the circuit breaker QF4, and disconnecting the circuit breaker QF11 so as to enable the first existing traction transformer to supply power for the traction network;
if the fault is a bus fault at the first flexible traction transformer and a bus fault at the second flexible traction transformer, stopping the system;
and if the fault is the contact network fault, controlling the corresponding breaker to be closed or opened according to the fault position of the contact network.
Further, if the fault is a contact network fault, controlling the corresponding breaker to be closed or opened according to a contact network fault position, specifically as follows:
judging a fault position;
if the contact network fault is positioned on the left side of the electric phase separation a, the breaker QF11 is disconnected;
if the contact network fault is located between the electric phase separation a and the electric phase separation b, the breaker QF11, the breaker QF12 and the breaker QF5 are disconnected, and the breaker QF1, the breaker QF3 and the breaker QF4 are closed, so that the left side of the electric phase separation a is powered by a first existing traction transformer, and the electric phase separation b and the electric phase separation c are powered by a second flexible traction transformer;
and if the contact network fault is positioned between the electric phase separation b and the electric phase separation c, disconnecting the circuit breaker QF12 and the circuit breaker QF5' so that the power supply arm on the left side of the electric phase separation b is supplied with power by the first flexible traction transformer.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention provides a flexible traction power supply system which comprises a first flexible traction transformer, a first existing traction transformer, a second flexible traction transformer and a second existing traction transformer, wherein the first existing traction transformer, the first flexible traction transformer, the second flexible traction transformer and the second existing traction transformer are sequentially arranged and connected to a bus through corresponding circuit breakers, the system further comprises a circuit breaker QF4, a circuit breaker QF5, a circuit breaker QF5', a circuit breaker QF4 ', a circuit breaker QF11 and a circuit breaker QF12, the circuit breaker 4 and the circuit breaker QF5 are respectively positioned on two sides of an electrical phase separation a, the circuit breaker QF5 and the circuit breaker QF5' are respectively positioned on two sides of an electrical phase separation b, the circuit breaker QF5' and the circuit breaker 4 ' are respectively positioned on two sides of an electrical phase separation c, the circuit breaker QF11 and the circuit breaker 12 are respectively connected in parallel to two ends of the electrical phase separation a and the electrical phase separation b, the inter-station electric phase separation in the through power supply section can be cancelled, through power supply of the power supply arms on two sides of the electric phase separation is realized, the problems of electric energy quality such as idle work, negative sequence, harmonic waves and the like in the existing traction power supply system are solved, and the power supply capacity is improved.
(2) The protection method of the flexible traction power supply system provided by the invention can realize self-healing reconstruction of the flexible traction power supply system under the condition of multiple faults of a single or multiple flexible traction substations, ensure stable power supply of the system after fault isolation and removal under multiple fault states, improve the power supply reliability of the flexible traction power supply system, and avoid the technical problem that the flexible traction power supply system cannot reliably supply power due to high fault rate of power electronic devices in the flexible traction power supply system.
Drawings
Fig. 1 is a schematic structural diagram of a flexible traction power supply system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a protection method for a flexible traction power supply system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a normal operating state of a flexible traction power supply system according to an embodiment of the present invention;
FIG. 4 is a schematic view of a first flexible traction transformer fault operating condition according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating an exemplary operating condition of a first flexible traction transformer in an embodiment of the present invention during a bus fault;
fig. 6 is a schematic diagram illustrating an operation state when both the first flexible traction transformer and the second flexible traction transformer fail according to the embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating operation of the system in the case of a bus fault at the first flexible traction transformer and a fault at the second flexible traction transformer in an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating operation of the system in the case of a failure of a first flexible traction transformer and a failure of a bus at a second flexible traction transformer according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a system in which a bus bar of a first flexible traction transformer fails and a bus bar of a second flexible traction transformer fails according to an embodiment of the present invention;
fig. 10 is a schematic diagram illustrating an operation state of a system, for example, when an ab-section fault occurs in a contact network of the flexible traction power supply system in the embodiment of the present invention;
fig. 11 is a schematic diagram illustrating an operation state of the flexible traction power supply system during the grid disconnection in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a flexible traction power supply system, as shown in fig. 1, a schematic structural diagram of the flexible traction power supply system provided in the embodiment of the application is shown, and the flexible traction power supply system includes:
the system comprises a first flexible traction transformer, a second flexible traction transformer and a third flexible traction transformer, wherein the first flexible traction transformer comprises a breaker QF6, a first energy-saving traction transformer, a breaker QF8, a first matching transformer, a first three-phase-single-phase converter and a breaker QF10 which are sequentially connected, the primary side three phase of the first energy-saving traction transformer is connected with a three-phase power grid through the breaker QF6, the secondary side three phase of the first energy-saving traction transformer is connected with the primary side three phase of the first matching transformer through a breaker QF8, the secondary side of the first matching transformer is connected with the input end of the first three-phase-single-phase converter, and the output end of the first three-phase-single-phase converter is connected with a bus A through the breaker QF 10;
the system comprises a first existing traction transformer, a second existing traction transformer and a third existing traction transformer, wherein the input end of the first existing traction transformer is connected with a three-phase power grid through a breaker QF1, the first output end of the first existing traction transformer is connected with a bus A through a breaker QF2, and the second output end of the first existing traction transformer is connected with a bus B through a breaker QF 3;
the second flexible traction transformer comprises a breaker QF6', a second energy-saving traction transformer, a breaker QF8', a second matching transformer, a second three-phase single-phase converter and a breaker QF10' which are sequentially connected, wherein the primary side three phase of the second energy-saving traction transformer is connected with a three-phase power grid through the breaker QF6', the secondary side three phase of the second energy-saving traction transformer is connected with the primary side three phase of the second matching transformer through the breaker QF8', the secondary side of the second matching transformer is connected with the input end of the second three-phase single-phase converter, and the output end of the second three-phase single-phase converter is connected with a bus A ' through the breaker QF10 ';
the input end of the second existing traction transformer is connected with the three-phase power grid through a breaker QF1 ', the first output end of the second existing traction transformer is connected with the bus A ' through a breaker QF2 ', and the second output end of the second existing traction transformer is connected with the bus B ' through a breaker QF3 ';
the first existing traction transformer, the first flexible traction transformer, the second flexible traction transformer and the second existing traction transformer are sequentially connected to a bus in an arrayed manner;
the system further comprises a breaker QF4, a breaker QF5, a breaker QF5' and a breaker QF4 ', the breaker QF4 and the breaker QF5 are respectively located on two sides of the electric phase separation a, the breaker QF5 and the breaker QF5' are respectively located on two sides of the electric phase separation b, the breaker QF5' and the breaker QF4 ' are respectively located on two sides of the electric phase separation c, the electric phase separation a and the electric phase separation c are respectively an electric phase separation in the flexible traction substation 1 and the flexible traction substation 2, the electric phase separation b is an electric phase separation between the flexible traction substation 1 and the flexible traction substation 2, the electric phase separation a is connected with the breaker QF11 in parallel, and the breaker QF12 is connected with the electric phase separation b in parallel.
In the embodiment of the application, the first energy-saving traction transformer is further connected with the bus A and the bus B through a breaker QF7, and the second energy-saving traction transformer is further connected with the bus A and the bus B 'through QF 7'.
The system comprises a first flexible traction transformer, a bus where the first flexible traction transformer is located, a first existing traction transformer, a bus where the first existing traction transformer is located, a breaker QF4 and a breaker QF5, wherein the flexible traction substation 1 is composed of the first flexible traction transformer and the bus where the first flexible traction transformer is located, the second flexible traction transformer and the bus where the second flexible traction transformer is located, the second existing traction transformer and the bus where the second existing traction transformer is located, the breaker QF4 ' and the breaker QF5' are composed of a flexible traction substation 2, and a power supply arm on the QF3 ' side is always used for supplying power to the right side of an electric phase separation on the c position when the system normally works.
The present application further provides a protection method of a flexible traction system, as shown in fig. 2, which is applied to the flexible traction power supply system as described above, the method includes the following steps:
step S1, real-time monitoring system circulation, electrical quantities of each part of the system, working states of each circuit breaker and protection action signals, wherein the working states comprise tripping and closing, the electrical quantities of each part of the system comprise voltage and current quantities of each circuit breaker, and the protection action signals comprise protection actions and protection inactions.
Specifically, circuit breakers are connected in parallel at two ends of an electric phase splitting point in a flexible traction substation 1 and between the flexible traction substation 1 and a flexible traction substation 2, corresponding voltage and current transformers, optical cable communication channels and power direction elements are arranged at a feeder circuit breaker and the electric phase splitting circuit breaker, electric quantity information at the electric phase splitting point of a traction network is monitored, mutual communication of the electric quantity information can be realized through the communication channels, and the inter-tripping of circuit breakers in the substation and in a section is realized, so that the working state switching of a system is realized.
Fig. 1 is a schematic structural diagram of a flexible traction power supply system, taking a flexible traction substation 1 in the figure as an example, when an energy-saving traction transformer fails, a protection action trips at QF6 and QF 8; when the matching transformer fault or the three-phase single-phase converter system fault occurs, the protection action trips at QF8 and QF 10; when the bus of the flexible traction substation has a fault, the protection action is tripped at QF10 and QF 5; the protection action is tripped at QF5, QF11 and QF12 when the traction network fails.
Through the protection action information of all parts of the flexible traction power supply system and the action tripping condition of the circuit breaker, the running condition of system equipment can be judged, and a basis is provided for the running state of the system, so that the safe and stable power supply of the system is ensured.
As shown in fig. 3, a schematic diagram of a normal operation state of the flexible traction power supply system is shown, electrical quantities and protection operation states of various parts of the system are detected, and when the system normally works, a substation breaker QF6, a breaker QF8, a breaker QF10, a breaker QF5, a breaker QF11, a breaker QF12, a breaker QF6', a breaker QF8', a breaker QF10', a breaker QF5', a breaker QF1 ', a breaker QF3 ' and a breaker QF4 ' are closed, other breakers are opened, and the flexible traction power supply system realizes long-distance through power supply.
And step S2, determining fault equipment based on the system circulation, the electrical quantities of all parts of the system, the working states of all circuit breakers and the protection action signals.
In this embodiment of the application, in the step S2, determining the faulty device based on the system circulation, the electrical quantities of each location of the system, the working states of each circuit breaker, and the protection operation signal specifically includes:
(1) if the system circulation is larger than a preset maximum limit value, the system is failed to be connected to the grid;
(2) if the system has protection actions, the circuit breaker QF10 and the circuit breaker QF8 or the circuit breaker QF6 and the circuit breaker QF8 trip, and the circuit breaker QF10', the QF6', the circuit breaker QF5', the circuit breaker QF5 and the circuit breaker QF8' are closed, the fault is the fault of the first flexible traction transformer;
(3) if the system has protection actions, the breaker QF10' and the breaker QF8' or the breaker QF6' and the breaker QF8' trip, and the breaker QF5', the breaker QF5, the breaker QF6, the breaker QF8 and the breaker QF10 are closed, the system is a second flexible traction transformer fault;
(4) if the system has protection action, the breaker QF10 trips to a breaker QF5, and when the breaker QF5', the breaker QF10', the breaker QF6', the breaker QF8', the breaker QF8 and the breaker QF6 are closed, the bus fault at the first flexible traction transformer is detected;
(5) if the system has protection action, the breaker QF10 'and the breaker QF5' trip, and the breaker QF5, the breaker QF10, the breaker QF6, the breaker QF8, the breaker QF8 'and the breaker QF6' are all closed, the bus fault at the second flexible traction transformer is detected;
(6) if the system has a protection action, when the circuit breaker QF10, the circuit breaker QF8, the circuit breaker QF10 'and the circuit breaker QF8' trip and the circuit breaker QF5 and the circuit breaker QF5 'are closed, or when the system has a protection action, the circuit breaker QF6', the circuit breaker QF8', the circuit breaker QF6 and the circuit breaker QF8 trip and the circuit breaker QF5 and the circuit breaker QF5' are closed, or when the system has a protection action, the circuit breaker QF6', the circuit breaker QF8', the circuit breaker QF8 and the circuit breaker QF10 trip and the circuit breaker QF5 and the circuit breaker QF5 'are closed, or when the system has a protection action, the circuit breaker 8', the circuit breaker QF10', the circuit breaker QF6 and the circuit breaker QF8 trip and the circuit breaker QF5 and the circuit breaker QF5', the first flexible traction transformer and the second flexible traction transformer are both failed;
(7) if the system has protection actions, the breaker QF10 trips to the breaker QF5, the breaker QF5', the breaker QF6 and the breaker QF8 are closed, and meanwhile, the breaker QF10' trips to the breaker QF8', or if the system has protection actions, when the breaker QF6' trips to the breaker QF8', the system is in bus fault at the first flexible traction transformer and fault at the second flexible traction transformer;
(8) if the system has protection actions, the breaker QF10 'trips with the breaker QF5' and the breaker QF5, the breaker QF6 'and the breaker QF8' are closed, and meanwhile, the breaker QF10 trips with the breaker QF8, or the breaker QF6 trips with the breaker QF8, the fault is the fault of the first flexible traction transformer and the fault of the bus at the second flexible traction transformer;
(9) if the system has protection actions, when the breaker QF10, the breaker QF5, the breaker QF5 'and the breaker QF10' trip and the breaker QF6, the breaker QF6', the breaker QF8 and the breaker QF8' are closed, the bus at the first flexible traction transformer fails and the bus at the second flexible traction transformer fails;
(10) and if the electric quantity at the breaker QF5 or the breaker QF5 'reaches a set protection action value and meets the fault direction condition, and meanwhile, the breaker QF10, the breaker QF10', the breaker QF6, the breaker QF6', the breaker QF8 and the breaker QF8' are closed and no protection action signal is sent, the fault of the contact network is determined.
And step S3, controlling each breaker according to the fault equipment.
In the embodiment of the present application, the step S3 is specifically as follows:
if the fault is grid connection failure of the system, the breaker QF12 is disconnected, the first flexible traction transformer supplies power to the power supply arm between the electric phase splitting a and the electric phase splitting b and on the left side of the electric phase splitting a, and the second flexible traction transformer supplies power to the power supply arm on the right side of the electric phase splitting b;
specifically, before or during normal operation of the system, whether the system circulation exceeds a preset limit value needs to be monitored, if yes, it is indicated that the two flexible traction transformers are failed to be connected to the grid, the system enters a grid disconnection working state, if the system is failed to be connected to the grid, the breaker QF12 is disconnected, the first flexible traction transformer supplies power to the power supply arms between the electric phase splitting a and the electric phase splitting b and on the left side of the electric phase splitting a, the second traction transformer supplies power to the power supply arm on the right side of the electric phase splitting b, namely the breaker QF12 is disconnected, the electric phase splitting at the b position is put into operation again, and the power supply arms are respectively supplied with power by the corresponding flexible traction transformers. The left power supply arm of the electric phase separation b is powered by a flexible traction transformer of a flexible traction substation 1, the bc power supply arm is powered by a flexible traction transformer of a flexible traction substation 2, and the schematic diagram of the network disconnection operation state of the flexible traction power supply system is shown in fig. 11.
If the fault is the fault of the first flexible traction transformer, closing the circuit breaker QF1 and the circuit breaker QF 2;
if the fault is the fault of the second flexible traction transformer, closing the circuit breaker QF 2';
specifically, as shown in fig. 4, a schematic diagram of a fault operation state of the first flexible traction transformer is shown, so that reconfiguration operation of the system is realized under the condition that a single flexible traction transformer fails (the same principle is applied to the fault condition of the flexible traction transformer in the flexible traction substation 2), and normal operation of the locomotive is ensured.
In the system protection action, when the breaker QF10 and the breaker QF8 or the breaker QF6 and the breaker QF8 trip and the breaker QF10', the breaker QF6', the breaker QF5', the breaker QF5 and the breaker QF8' are closed, the flexible traction transformer fault in the flexible traction substation 1 is judged, namely the first flexible traction transformer, the breaker QF1 and the breaker QF2 in the flexible traction substation 1 are closed, and the flexible traction transformer in the flexible traction substation 2, namely the second flexible traction transformer and the existing traction transformer in the flexible traction substation 1, namely the second existing traction transformer and a power supply arm of the existing traction transformer are connected in a grid mode to jointly supply power to the traction network, so that the normal operation after the flexible traction power supply system is reconfigured when a single flexible traction transformer has a fault is realized; during system protection, when the breaker QF10 'and the breaker QF8' or the breaker QF6 'and the breaker QF8' trip and the breaker QF5', the breaker QF5, the breaker QF6, the breaker QF8 and the breaker QF10 are closed, the flexible traction transformer of the flexible traction substation 2 fails, the breaker QF 2' of the flexible traction substation 2 is closed, an existing traction transformer of the flexible traction substation 2 and the flexible traction transformer of the flexible traction substation 1 are connected in a grid mode to jointly supply power to a traction network, and normal operation after the flexible traction power supply system is reconstructed when a single flexible traction transformer fails is achieved.
If the fault is a bus fault at the first flexible traction transformer, controlling the second flexible traction transformer to supply power for a system run-through power supply section;
if the fault is a bus fault at the second flexible traction transformer, controlling the first flexible traction transformer to supply power for a system through power supply section;
specifically, as shown in fig. 5, a schematic diagram of an operation state is taken as an example when a bus of the flexible traction substation 1 fails, that is, when a bus of the first flexible traction transformer fails, system reconfiguration is realized when the bus of the single flexible traction substation fails, and the reduced power of the locomotive can pass through.
In the system protection action, when the circuit breakers QF10 and QF5 are tripped and QF5', QF10', QF6', QF8', QF8 and QF6 are closed, the bus fault of the flexible traction substation 1 is judged, and at the moment, the flexible traction transformer in the flexible traction substation 2 is used for supplying power to the system through power supply section; in the system protection operation, when the circuit breakers QF10 'and QF5' are tripped and QF5, QF10, QF6, QF8, QF8 'and QF6' are closed, it is determined that the bus of the flexible traction power substation 2 has a fault, and at this time, the system through power supply section is supplied with power only by the flexible traction transformer in the flexible traction power substation 1.
If the faults are faults of both the first flexible traction transformer and the second flexible traction transformer, both the breaker QF11 and the breaker QF12 are disconnected, so that the system returns to the existing traction power supply state;
specifically, as shown in fig. 6, the schematic diagram of the operation state when both the first flexible traction transformer and the second flexible traction transformer are in fault is shown, the electrical quantities and the protection operation states of various parts of the system are detected, and when the circuit breaker QF10' and the circuit breaker QF8' or the circuit breaker QF6' and the circuit breaker QF8' trip and the circuit breaker QF10 and the circuit breaker QF8 or the circuit breaker QF6 and the circuit breaker QF8 trip and the circuit breaker QF5 and the circuit breaker QF5' close in the system protection operation, all the flexible traction transformers are in fault, the circuit breaker QF11 and the circuit breaker QF12 are disconnected, all the electric phases are put into use again, and the system returns to the existing traction power supply system state. If the breaker QF6 is closed, the energy-saving traction transformer is judged to have no fault, the existing traction power supply mode power supply is realized by the energy-saving traction transformer, if the breaker QF6 is disconnected, the energy-saving traction transformer is judged to have a fault, the existing traction transformer of a transformer substation is used for realizing the existing traction power supply mode power supply, and the specific conditions are as follows:
for the flexible traction substation 1, if the breaker QF6 is in a closed state, the energy-saving traction transformer is judged to be normal, and the closed breaker QF7 realizes power supply in an existing traction power supply mode by using the energy-saving traction transformer of the flexible traction substation 1; if the breaker QF6 is in a disconnected state, judging that the energy-saving traction transformer has a fault, closing the breaker QF1, the breaker QF2, the breaker QF3 and the breaker QF4, and supplying power to a traction network by using the existing traction transformer in an existing traction power supply mode; for the flexible traction substation 2, if the breaker QF6 'is in a closed state, the energy-saving traction transformer is judged to be normal, the breaker QF 7' is closed, the breaker QF1 'and the breaker QF 3' are opened, and the energy-saving traction transformer of the flexible traction substation 2 realizes power supply in an existing traction power supply mode; if the breaker QF6 'is in an off state, the fault of the energy-saving traction transformer is judged, the breaker QF 2' is closed, and the existing traction power supply mode is utilized to supply power to the traction network.
If the fault is a bus fault at the first flexible traction transformer and a fault of the second flexible traction transformer, closing a breaker QF 2' to enable the second existing traction transformer to supply power for the through power supply section;
specifically, as shown in fig. 7, a schematic diagram of system operation when the first flexible traction transformer has a bus fault and the second flexible traction transformer has a fault is shown, in a system protection operation, when both the breaker QF10 and the breaker QF5 trip and the breaker QF5', the breaker QF6 and the breaker QF8 are closed, and when the breaker QF10' and the breaker QF8 'or the breaker QF6' and the breaker QF8 'trip, it is determined that the bus fault of the flexible traction substation 1 and the flexible traction transformer of the flexible traction substation 2 occur, at this time, the breaker QF 2' is closed, the existing traction transformer of the flexible traction substation 2 supplies power to the long-distance through power supply section, and the locomotive operates in a power-reducing manner.
If the fault is the fault of the first flexible traction transformer and the bus fault of the second flexible traction transformer, closing the circuit breaker QF1, the circuit breaker QF2, the circuit breaker QF3 and the circuit breaker QF4, and opening the circuit breaker QF11 so that the first existing traction transformer supplies power to a traction network;
specifically, as shown in fig. 8, a schematic diagram of system operation when the first flexible traction transformer fails and the second flexible traction transformer has a bus fault is shown, in a system protection operation, when the breaker QF10 'and the breaker QF5' both trip and the breaker QF5, the breaker QF6', and the breaker QF8' are closed, and when the breaker QF10 and the breaker QF8 or the breaker QF6 and the breaker QF8 trip, it is determined that the flexible traction substation 2 has a bus fault and the flexible traction transformer 1 has a flexible traction transformer fault, at this time, the breaker QF1, the breaker QF2, the breaker QF3, and the breaker QF4 are closed, the breaker QF11 is opened, power is supplied by an existing traction transformer of the flexible traction substation 1, and the locomotive operates with reduced power.
If the fault is a bus fault at the first flexible traction transformer and a bus fault at the second flexible traction transformer, stopping the system;
specifically, as shown in fig. 9, which is a schematic diagram of a system when a bus of a first flexible traction transformer has a fault and a bus of a second flexible traction transformer has a fault, when the system protection is performed, the circuit breaker QF10 and the circuit breaker QF5 are both disconnected, and the circuit breaker QF5 'and the circuit breaker QF10' are disconnected, the buses of the two flexible traction substations have faults, the flexible traction power supply system has a fault, and the system stops operating.
And if the fault is the contact network fault, controlling the corresponding breaker to be closed or opened according to the fault position of the contact network.
In this application embodiment, if the trouble is the contact net trouble, then close or break according to the corresponding circuit breaker of contact net trouble position control, specifically as follows:
judging a fault position;
if the contact network fault is positioned on the left side of the electric phase separation a, the breaker QF11 is disconnected;
if the contact network fault is located between the electric split phase a and the electric split phase b, the breaker QF11, the breaker QF12 and the breaker QF5 are disconnected, the breaker QF1, the breaker QF3 and the breaker QF4 are closed, so that the left side of the electric split phase a is powered by a first existing traction transformer, and the electric split phase b and the electric split phase c are powered by a second flexible traction transformer;
and if the contact network fault is positioned between the electric phase separation b and the electric phase separation c, disconnecting the circuit breaker QF12 and the circuit breaker QF5' so that the power supply arm on the left side of the electric phase separation b is supplied with power by the first flexible traction transformer.
Specifically, as shown in fig. 10, for a schematic diagram of a system operation state, for example, when an ab-section of a contact network of a flexible traction power supply system has a fault, in a system protection operation, if an electrical quantity measured at the breaker QF5 or the breaker QF5' reaches a set protection operation value and meets a fault direction condition, and at the same time, when the breaker QF10, the breaker QF10', the breaker QF6, the breaker QF6', the breaker QF8, and the breaker QF8' are all closed, it is determined that the contact network has the fault, and a fault occurrence direction is detected by the breaker QF5, the breaker QF5', the breaker QF11, and the breaker QF12, and the system operation is isolated in a fault section by operating on a corresponding breaker, so as to reduce an influence of the fault on the system operation, which is specifically:
when a fault occurs on the left side of the electric phase separation a, the breaker QF11 is disconnected, the fault is isolated on the power supply arm on the left side of the electric phase separation a, and the power supply arm on the right side of the electric phase separation a is normally supplied with power by the flexible traction substation 1 and the flexible traction substation 2; when a fault occurs in an ab section, the breaker QF11, the breaker QF12 and the breaker QF5 are disconnected, the fault is isolated on an ab power supply arm, the breaker QF1, the breaker QF3 and the breaker QF4 are closed, the power supply arm on the left side of the electric phase separation a is normally powered by an existing traction transformer of a flexible traction substation 1, and the bc power supply arm is normally powered by a flexible traction transformer of a flexible traction substation 2; when a fault occurs in the bc section, the circuit breaker QF12 and the circuit breaker QF5' are disconnected, the fault is isolated in the bc section, and the power supply arm on the left side of the electric phase separation b is normally supplied with power by the transformer of the flexible traction substation 1.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto and changes may be made without departing from the scope of the invention in its aspects.

Claims (5)

1. A flexible traction power supply system, the system comprising:
the system comprises a first flexible traction transformer, a second flexible traction transformer and a third flexible traction transformer, wherein the first flexible traction transformer comprises a breaker QF6, a first energy-saving traction transformer, a breaker QF8, a first matching transformer, a first three-phase-single-phase converter and a breaker QF10 which are sequentially connected, the primary side three phase of the first energy-saving traction transformer is connected with a three-phase power grid through the breaker QF6, the secondary side three phase of the first energy-saving traction transformer is connected with the primary side three phase of the first matching transformer through a breaker QF8, the secondary side of the first matching transformer is connected with the input end of the first three-phase-single-phase converter, and the output end of the first three-phase-single-phase converter is connected with a bus A through the breaker QF 10;
the system comprises a first existing traction transformer, a second existing traction transformer and a third existing traction transformer, wherein the input end of the first existing traction transformer is connected with a three-phase power grid through a breaker QF1, the first output end of the first existing traction transformer is connected with a bus A through a breaker QF2, and the second output end of the first existing traction transformer is connected with a bus B through a breaker QF 3;
the second flexible traction transformer comprises a breaker QF6', a second energy-saving traction transformer, a breaker QF8', a second matching transformer, a second three-phase single-phase converter and a breaker QF10' which are sequentially connected, wherein the primary side three phase of the second energy-saving traction transformer is connected with a three-phase power grid through the breaker QF6', the secondary side three phase of the second energy-saving traction transformer is connected with the primary side three phase of the second matching transformer through the breaker QF8', the secondary side of the second matching transformer is connected with the input end of the second three-phase single-phase converter, and the output end of the second three-phase single-phase converter is connected with a bus A ' through the breaker QF10 ';
the input end of the second existing traction transformer is connected with the three-phase power grid through a breaker QF1 ', the first output end of the second existing traction transformer is connected with the bus A ' through a breaker QF2 ', and the second output end of the second existing traction transformer is connected with the bus B ' through a breaker QF3 ';
the first existing traction transformer, the first flexible traction transformer, the second flexible traction transformer and the second existing traction transformer are sequentially connected to a bus in an arrayed manner;
the system further comprises a breaker QF4, a breaker QF5, a breaker QF5' and a breaker QF4 ', wherein the breaker QF4 and the breaker QF5 are respectively positioned on two sides of the electric phase separation a, the breaker QF5 and the breaker QF5' are respectively positioned on two sides of the electric phase separation b, and the breaker QF5' and the breaker QF4 ' are respectively positioned on two sides of the electric phase separation c, wherein the electric phase separation a and the electric phase separation c are respectively an electric phase separation in the flexible traction substation 1 and the flexible traction substation 2, the electric phase separation b is an electric phase separation between the flexible traction substation 1 and the flexible traction substation 2, the electric phase separation a is connected with the breaker QF11 in parallel, and the breaker QF12 is connected with the electric phase separation b in parallel;
the first energy-saving traction transformer is further connected with the bus A and the bus B through a breaker QF7, and the second energy-saving traction transformer is further connected with the bus A ' and the bus B ' through QF7 '.
2. A method for protecting a flexible traction power supply system, which is applied to the flexible traction power supply system according to claim 1, and comprises the following steps:
s1, real-time monitoring of system circulation, electrical quantities of all parts of the system, working states of all circuit breakers and protection action signals, wherein the working states comprise tripping and closing, the electrical quantities of all parts of the system comprise voltage and current quantities of all circuit breakers, and the protection action signals comprise protection actions and protection inactions;
s2, determining fault equipment based on system circulation, electrical quantities of all parts of the system, working states of all circuit breakers and protection action signals;
and S3, controlling each breaker according to the fault equipment.
3. The method for protecting a flexible traction power supply system according to claim 2, wherein the step S2 determines a fault device based on the system circulation, the electrical quantities of various parts of the system, the operating states of various circuit breakers, and the protection action signal, which includes:
if the system circulation is larger than a preset maximum limit value, the system is failed to be connected to the grid;
if the system has protection actions, the circuit breaker QF10 and the circuit breaker QF8 or the circuit breaker QF6 and the circuit breaker QF8 trip, and the circuit breaker QF10', the QF6', the circuit breaker QF5', the circuit breaker QF5 and the circuit breaker QF8' are closed, the fault is the fault of the first flexible traction transformer;
if the system has protection action, the breaker QF10' and the breaker QF8' or the breaker QF6' and the breaker QF8' trip, and the breaker QF5', the breaker QF5, the breaker QF6, the breaker QF8 and the breaker QF10 are closed, the system is a second flexible traction transformer fault;
if the system has protection action, the breaker QF10 trips to a breaker QF5, and when the breaker QF5', the breaker QF10', the breaker QF6', the breaker QF8', the breaker QF8 and the breaker QF6 are closed, the bus fault at the first flexible traction transformer is detected;
if the system has protection action, the breaker QF10 'and the breaker QF5' trip, and the breaker QF5, the breaker QF10, the breaker QF6, the breaker QF8, the breaker QF8 'and the breaker QF6' are all closed, the bus fault at the second flexible traction transformer is detected;
if the system has a protection action, when the circuit breaker QF10, the circuit breaker QF8, the circuit breaker QF10 'and the circuit breaker QF8' trip and the circuit breaker QF5 and the circuit breaker QF5 'are closed, or when the system has a protection action, the circuit breaker QF6', the circuit breaker QF8', the circuit breaker QF6 and the circuit breaker QF8 trip and the circuit breaker QF5 and the circuit breaker QF5' are closed, or when the system has a protection action, the circuit breaker QF6', the circuit breaker QF8', the circuit breaker QF8 and the circuit breaker QF10 trip and the circuit breaker QF5 and the circuit breaker QF5 'are closed, or when the system has a protection action, the circuit breaker 8', the circuit breaker QF10', the circuit breaker QF6 and the circuit breaker QF8 trip and the circuit breaker QF5 and the circuit breaker QF5', the first flexible traction transformer and the second flexible traction transformer are both failed;
if the system has protection actions, the breaker QF10 trips to the breaker QF5, the breaker QF5', the breaker QF6 and the breaker QF8 are closed, and meanwhile, the breaker QF10' trips to the breaker QF8', or if the system has protection actions, when the breaker QF6' trips to the breaker QF8', the system is in bus fault at the first flexible traction transformer and fault at the second flexible traction transformer;
if the system has protection actions, the breaker QF10 'and the breaker QF5' trip, the breaker QF5, the breaker QF6 'and the breaker QF8' close, and meanwhile, the breaker QF10 and the breaker QF8 trip, or the breaker QF6 and the breaker QF8 trip, the system is a fault of a first flexible traction transformer and a fault of a bus at the position of a second flexible traction transformer;
if the system has protection actions, when the breaker QF10, the breaker QF5, the breaker QF5 'and the breaker QF10' trip and the breaker QF6, the breaker QF6', the breaker QF8 and the breaker QF8' are closed, the bus at the first flexible traction transformer fails and the bus at the second flexible traction transformer fails;
and if the electric quantity at the breaker QF5 or the breaker QF5 'reaches a set protection action value and meets the fault direction condition, and meanwhile, the breaker QF10, the breaker QF10', the breaker QF6, the breaker QF6', the breaker QF8 and the breaker QF8' are closed and no protection action signal is sent, the fault of the contact network is determined.
4. The method for protecting the flexible traction power supply system according to claim 3, wherein the step S3 is as follows:
if the fault is grid connection failure of the system, the breaker QF12 is disconnected, the first flexible traction transformer supplies power for the power supply arms between the split phase a and the split phase b and on the left side of the split phase a, and the second flexible traction transformer supplies power for the power supply arm on the right side of the split phase b;
if the fault is the fault of the first flexible traction transformer, closing the circuit breaker QF1 and the circuit breaker QF 2;
if the fault is the fault of the second flexible traction transformer, closing the circuit breaker QF 2';
if the fault is a bus fault at the first flexible traction transformer, controlling the second flexible traction transformer to supply power for a system through power supply section;
if the fault is a bus fault at the second flexible traction transformer, controlling the first flexible traction transformer to supply power for a system through power supply section;
if the faults are faults of both the first flexible traction transformer and the second flexible traction transformer, both the breaker QF11 and the breaker QF12 are disconnected, so that the system returns to the existing traction power supply state;
if the fault is a bus fault at the first flexible traction transformer and a fault of the second flexible traction transformer, closing a breaker QF 2' to enable the second existing traction transformer to supply power for the through power supply section;
if the fault is the fault of the first flexible traction transformer and the bus fault of the second flexible traction transformer, closing the circuit breaker QF1, the circuit breaker QF2, the circuit breaker QF3 and the circuit breaker QF4, and disconnecting the circuit breaker QF11 so as to enable the first existing traction transformer to supply power for the traction network;
if the fault is a bus fault at the first flexible traction transformer and a bus fault at the second flexible traction transformer, stopping the system;
and if the fault is the contact network fault, controlling the corresponding breaker to be closed or opened according to the fault position of the contact network.
5. The protection method for the flexible traction power supply system according to claim 4, wherein if the fault is a catenary fault, the corresponding circuit breaker is controlled to be closed or opened according to a catenary fault position, specifically as follows:
judging a fault position;
if the contact network fault is positioned on the left side of the electric phase separation a, the breaker QF11 is disconnected;
if the contact network fault is located between the electric split phase a and the electric split phase b, the breaker QF11, the breaker QF12 and the breaker QF5 are disconnected, the breaker QF1, the breaker QF3 and the breaker QF4 are closed, so that the left side of the electric split phase a is powered by a first existing traction transformer, and the electric split phase b and the electric split phase c are powered by a second flexible traction transformer;
and if the contact network fault is positioned between the electrical split phase b and the electrical split phase c, disconnecting the breaker QF12 and the breaker QF5' so that the power supply arm on the left side of the electrical split phase b is supplied with power by the first flexible traction transformer.
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