CN112865098A - Full-through type flexible traction power supply system compatible with out-of-phase power supply - Google Patents
Full-through type flexible traction power supply system compatible with out-of-phase power supply Download PDFInfo
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Abstract
The application discloses with flexible power supply system that pulls of full through type of heterogeneous power supply compatibility includes: at least one traction substation and at least one subregion institute, traction substation includes: a traction transformer; the first path of power supply inlet wire and the second path of power supply inlet wire; the first end and the second end of the static power converter SPC are connected with the traction transformer; the first sectional bus is connected with the traction transformer through the third circuit breaker to the sixth circuit breaker and is connected with the fourth ends of the plurality of static power converters SPC; first to fourth feed lines; a first electrically split phase structure; the partition includes: a second isolation switch; the first end of the second electric phase splitting structure is connected with the third end of the first electric phase splitting structure through a down line, and the second end of the second electric phase splitting structure is connected with the fourth end of the first electric phase splitting structure through an up line; and a fifth feeder line to an eighth feeder line arranged between the second sectional bus and the second electric phase splitting structure, so that the electric phase splitting problem is effectively solved.
Description
Technical Field
The application relates to the technical field of power systems, in particular to a full-through type flexible traction power supply system compatible with out-of-phase power supply.
Background
Through the same-phase power supply technology, the defects of the traditional out-of-phase power supply mode can be overcome to a great extent, and the future development trend is realized. In the related art, one of the following power supply systems is generally employed: the system comprises a quasi-cophase power supply technology, a through-type cophase traction power supply mode based on a three-phase-single-phase power electronic converter, a Vv wiring traction substation out-of-phase and cophase compatible comprehensive compensation device, a traction power supply system and the like.
However, the power supply systems used in the related art often have a technical problem that they can only run through the same phase and cannot be compatible with different phases.
Therefore, as the main traffic lines in China already finish the electrification of railway transportation, the existing electrified railway lines are necessarily modified; meanwhile, in order to improve the reliability of the system, it is necessary to study a through in-phase power supply scheme compatible with the out-phase power supply method.
Content of application
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the invention aims to provide a full-through type flexible traction power supply system compatible with out-of-phase power supply, which cancels electric phase splitting, obviously improves the quality of electric energy and brings many advantages to the traction power supply system; meanwhile, a specific wiring mode for penetrating through in-phase traction power supply is provided, the wiring mode can be compatible with out-phase power supply and penetrating in-phase power supply, and a technical scheme is provided for out-phase power supply electrified railway engineering to be transformed into penetrating in-phase power supply.
In order to achieve the above object, an embodiment of the present application provides a fully through flexible traction power supply system compatible with out-of-phase power supply, including:
at least one traction substation and at least one zoning substation, wherein,
the traction substation includes:
a traction transformer;
the power supply comprises a first power supply inlet wire and a second power supply inlet wire, wherein the first power supply inlet wire and the second power supply inlet wire are divided
The first circuit breaker and the second circuit breaker are respectively connected with one side of the traction transformer;
a plurality of static Power converters SPC (Stat1c Power Converter, static Power Converter), first and second ends of which are respectively connected to the traction transformer, and third ends of which are all grounded;
a second disconnecting switch disposed at a preset position of the first sectional bus, wherein the first sectional bus is connected to the traction transformer through third to sixth circuit breakers, and the first sectional bus is connected to fourth ends of the plurality of static power converters SPC;
the first feeder line and the fourth feeder line are respectively connected with the first sectional bus and an uplink of the overhead line system through a seventh circuit breaker and a tenth circuit breaker, and the second feeder line and the third feeder line are respectively connected with the first sectional bus and a downlink of the overhead line system through an eighth circuit breaker and a ninth circuit breaker;
the first end of the first electric phase separation structure is connected with a downlink of the overhead line system, and the second end of the first electric phase separation structure is connected with an uplink of the overhead line system;
the partitioning includes:
the second isolating switch is arranged at a preset position of the second sectional type bus;
the first end of the second electric phase separation structure is connected with the third end of the first electric phase separation structure through a descending line of the overhead line system, and the second end of the second electric phase separation structure is connected with the fourth end of the first electric phase separation structure through an ascending line of the overhead line system;
and the sixth feeder line and the eighth feeder line are respectively connected with the second sectional bus and a downlink of the overhead line system through a twelfth breaker and a fourteenth breaker.
In addition, the fully through type flexible traction power supply system compatible with out-of-phase power supply according to the above embodiment of the present invention may further have the following additional technical features:
optionally, the fully-through flexible traction power supply system compatible with out-of-phase power supply further includes:
a third isolator switch disposed between the first feed line and the second feed line;
a fourth isolation switch disposed between the third feed line and the fourth feed line.
Optionally, wherein,
when the secondary side of the traction transformer is two-phase power, the SPC adopts single-phase input/single-phase output SPC;
when the secondary side of the traction transformer is three-phase power, the SPC adopts three-phase input/single-phase output SPC.
Optionally, the number of the traction transformers is multiple, so as to control the parallel operation of multiple traction transformers.
Optionally, the electric phase separation structure comprises an electric phase separation structure without a circuit breaker and an electric phase separation structure with a circuit breaker, wherein the electric phase separation structure without the circuit breaker is powered in a through same phase mode by closing the bus disconnecting switch and the online feeder circuit breaker of the traction substation or the regional substation.
Optionally, when the SPC is locked, all SPC in-out line switches, the on-line feeder circuit breakers, the electrical split phase isolator bilateral switches, and the bus isolator are opened, and all the on-line feeder circuit breakers and the secondary side feeder switch of the traction transformer are closed, so that the through in-phase power supply mode is switched to the out-phase power supply mode.
Therefore, according to the fully-through type flexible traction power supply system compatible with out-of-phase power supply, electric phase splitting can be omitted, the quality of electric energy is obviously improved, a plurality of advantages are brought to the traction power supply system, and the problem of electric phase splitting is effectively solved; meanwhile, a specific wiring mode for through in-phase traction power supply is provided, and the wiring mode can be compatible with out-phase power supply and through in-phase power supply, so that a technical scheme is provided for out-phase power supply electrified railway engineering to be transformed into through in-phase power supply; in addition, the system can also realize flexible switching between an out-phase power supply mode and an in-phase power supply mode, has high reliability, can be suitable for various application scenes, and has high engineering practical value. The technology in the patent can be utilized by traction power supply systems adopting various traction transformers to realize through in-phase power supply; the system has the capability of system-level coordination control, and can organize two traction transformers of each traction substation to run in parallel, thereby fully utilizing the capacity of the traction transformers, reducing the standby capacity of the traction transformers and improving the economical efficiency of the system; the system can also realize the isolation of a public power grid and a contact network and has fault ride-through capability. Under the through same-phase power supply mode, the power failure and switching influence range is small during fault, and the power supply reliability is high.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a Vv wiring traction substation out-of-phase and in-phase compatible comprehensive compensation device in the related art;
fig. 2 is a traction power supply system in the related art.
FIG. 3 is a schematic diagram of a main wiring of a fully pass-through flexible traction power supply system compatible with out-of-phase power supply according to an embodiment of the present application;
FIG. 4 is a schematic of the traction transformer and single phase input/single phase output SPC wiring according to one embodiment of the present application;
FIG. 5 is a schematic diagram of the traction transformer wired with a three phase input/single phase output SPC according to one embodiment of the present application;
FIG. 6 is a wiring schematic of an electrical phase separation structure without circuit breakers according to one embodiment of the present application;
FIG. 7 is a wiring schematic of an electrically split belt circuit breaker configuration according to one embodiment of the present application;
FIG. 8 is a schematic diagram of a bus run-through without a circuit breaker for an electrical phase splitter according to one embodiment of the present application;
FIG. 9 is a schematic diagram of a contact grid feed-through without a circuit breaker for an electrical phase splitter according to one embodiment of the present application;
FIG. 10 is a schematic diagram of a single feeder with up and down lines without circuit breakers according to one embodiment of the present application;
FIG. 11 is a schematic diagram of a hybrid shoot-through mode without a circuit breaker for an electrical phase splitter according to one embodiment of the present application;
FIG. 12 is a schematic diagram of a feedthrough on a contact grid for an electrical split-phase belt circuit breaker according to one embodiment of the present application;
fig. 13 is a schematic diagram of a single feeder strip uplink and downlink operation with an electrically split strip circuit breaker, according to one embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The fully through type flexible traction power supply system compatible with out-of-phase power supply proposed according to the embodiment of the invention is described below with reference to the accompanying drawings.
Before describing the fully through type flexible traction power supply system compatible with out-of-phase power supply of the embodiment of the application, a few related technologies are briefly described to be capable of only through the in-phase power supply system.
(1) A quasi-cophase power supply technology;
the related art provides an electrified railway power supply mode which can eliminate partial electric phase separation. Because the active compensation type in-phase power supply system has quasi-in-phase power supply capability, an electric phase splitting device in the original traction power supply station can be eliminated, and the number of electric phase splitting of the power supply system is greatly reduced.
Because the output voltage of each traction power supply station is mainly determined by a certain output winding of the traction transformer, the output voltage phases of adjacent traction power supply stations generally cannot be completely the same, but are significantly different, so that the power supply mode cannot cancel the electric phase splitting between the traction power supply stations, and the problem of locomotive over-phase splitting cannot be solved. The in-phase power feeding system is not a completely through in-phase power feeding but a power feeding system between an out-phase power feeding and a through in-phase power feeding.
(2) A through type cophase traction power supply mode based on a three-phase-single-phase power electronic converter;
in the related art, an improved parallel through type traction power supply system based on an existing traction power supply system is disclosed, and a power electronic conversion device for replacing an electric phase splitting is arranged between a three-phase power grid and a traction grid. In each traction substation, an output alpha seat and an output beta seat of a traction transformer Q connected to a three-phase power grid are respectively connected with the traction grid through a power electronic conversion device D and a boosting transformer S connected with the power electronic conversion device D; the power electronic conversion device D is composed of more than one single-phase-single-phase converter which is connected in parallel and generates AC-DC-AC conversion.
The through type traction power supply system based on the parallel connection of the multilevel converters is formed by building a plurality of through type traction substation parallel connection networks, and the traction networks of adjacent substations are directly connected to form a through type traction power supply network; the through type traction substation consists of an input step-down transformer connected with a three-phase power grid connected with the through type traction substation, more than one multi-level three-phase-alternating-direct-alternating converter connected with an output end of the through type traction substation and in a parallel connection state, and an output step-up transformer connected with the converter and the traction grid.
Although both methods for making the voltages of all lines of the traction network of the electric railway in the same phase are described, the methods only relate to power electronic equipment, and no specific penetration method for penetrating the traction power supply method in the same phase and main wiring thereof are studied.
(3) An out-phase and in-phase compatible comprehensive compensation device for Vv wiring traction substation;
as shown in fig. 1, the related art discloses an out-of-phase and in-phase compatible comprehensive compensation device for Vv wiring traction substation: on the secondary side of the traction substation, both the leading phase and the lagging phase supply power to a traction load; alternating current sides of the first static var generator and the second static var generator which are back-to-back on the direct current sides are respectively connected with a leading phase and a lagging phase of the traction transformer to form a comprehensive compensation device which is compatible with an out-phase structure and an in-phase structure and is easy to develop from the out-phase mode into the in-phase mode so as to generate a negative sequence tide opposite to a traction load, and reactive compensation and harmonic treatment are taken into consideration through reasonable control.
However, it is applicable only to Vv-connection traction substations and not to traction substations of all connection forms. Meanwhile, negative sequence management and reactive compensation cannot be simultaneously considered by the technology, and in order to generate a negative sequence tide opposite to a traction load, a large amount of reactive power needs to be introduced, so that the capacity of a traction substation is wasted.
(4) A traction power supply system;
traction transformers and catenary lines are the two most important parts. The traction transformer is powered by a 110kV or 220kV public power grid and converts high voltage electricity in the power transmission grid into alternating current with a lower voltage level; or the low-voltage alternating current is supplied to the power electronic device so as to be further converted into low-voltage direct current to be supplied to a contact network; the contact net plays a role of a power transmission line; electric locomotives introduce electrical energy into the locomotive through an electrical pantograph or otherwise for operation of an electric motor on the locomotive.
As shown in fig. 2, what is specifically illustrated is an electrical phase splitting structure, which is an insulating switch dedicated to separating the supply sections of different voltage phases. Since 25kV/50Hz single-phase alternating current was established as the standard electric railway power supply system in China since 1958, all electric railway loads are single-phase loads.
In order to avoid the problem of three-phase imbalance caused by a large amount of single-phase loads, a method of 'rotating phase sequence' is adopted. For example, if a phase power supply area uses a phase power, the next phase power supply area uses a phase power B, and the next phase power supply area uses a phase power C, and the cycle is sequential, which is a method of 'rotating phase sequence'. Because the phase difference of the voltages of two adjacent power supply areas is 120 degrees or 60 degrees, in order to avoid the traction system electromagnetic looped network, an electrical phase separation structure is required to separate different power supply areas.
Although the electric phase splitting has the functions of separating each power supply section and treating three-phase unbalance, the electric phase splitting is a main source of faults of a traction power supply system, and the problems of neck clamping, such as reduction of the running speed of a high-speed rail, bending of a heavy-duty locomotive and the like are further caused.
Therefore, the present application proposes a fully through flexible traction power supply system compatible with out-of-phase power supply in order to solve the above problems.
Specifically, fig. 3 is a block diagram illustrating a fully through flexible traction power supply system compatible with out-of-phase power supply according to an embodiment of the present application.
As shown in fig. 3, the all-through flexible circuit compatible with the out-of-phase power supplyThe sexual traction power supply system comprises: at least one traction substation (e.g. traction substation T)1) And at least one partition site (e.g., partition site S)1)。
Wherein, the traction substation T1The method comprises the following steps: traction transformer (such as TT)1-1、TT1-2) (ii) a First power inlet TL1-1And a second power supply inlet line TL1-2Wherein, the first path and the second path of power inlet wire respectively pass through the first circuit breaker B1-1And a second breaker B1-2Is connected with the primary side of the traction transformer; multiple static Power converters SPC (Stat1c Power Converter) (e.g., SPC)1-1……SPC1-k) The first end and the second end of the SPC are connected with the secondary side of the traction transformer through the input circuit breaker BI respectively and are connected with the two traction transformers, the third end of the SPC is grounded, and the fourth end of the SPC is connected with the first sectional bus.
Wherein, two second isolating switches GT arranged at the preset position of the first sectional type bus which is divided into two sections96And GT97Wherein the first sectional bus bar passes through the third to sixth circuit breakers (i.e., circuit breaker B)1-11，B1-12，B1-21，B1-22) The first sectional bus is connected with the fourth ends of the plurality of static power converters SPC through an output circuit breaker BO; first to fourth feeders, wherein the first and fourth feeders are respectively passed through seventh breakers BT1-1And a tenth breaker BT1-4The second feeder line and the third feeder line are respectively connected with an uplink line of the first sectional type bus and a contact net through an eighth breaker BT1-2And a ninth breaker BT1-3The first section type bus is connected with a down line of a contact network; the first end of the first electric phase splitting structure is connected with a downlink of a contact network, and the second end of the first electric phase splitting structure is connected with an uplink of the contact network; the partition includes:
section station S1The method comprises the following steps: two second isolating switches GS arranged at preset positions of second sectional type buses divided into two sections1-96And GS1-97(ii) a Of a second electrically-split phase configurationThe first end of the first electric phase splitting structure is connected with the third end of the first electric phase splitting structure through a down line of a contact network, and the second end of the second electric phase splitting structure is connected with the fourth end of the first electric phase splitting structure through an up line of the contact network; a fifth feeder line to an eighth feeder line arranged between the second sectional bus and the second electric phase splitting structure, wherein the fifth feeder line and the seventh feeder line respectively pass through an eleventh circuit breaker BS1-1And a thirteenth breaker BS1-3The sixth feeder line and the eighth feeder line are respectively connected with an uplink line of the second sectional bus and a contact network through a twelfth breaker BS1-2And a fourteenth breaker BS1-4And the second sectional bus is connected with a down line of the contact net.
Optionally, as shown in fig. 3, the fully-through flexible traction power supply system compatible with out-of-phase power supply further includes: a third isolating switch GT arranged between the first feeder and the second feeder1-12(ii) a A fourth isolating switch GT arranged between the third feeder and the fourth feeder1-34。
It will be appreciated that for the traction substation T, as shown in FIG. 31There are two power supply incoming lines, the first power supply incoming line can be TL1-1The second power inlet line can be TL1-2The voltage level can be, but is not limited to, 220kV, 110kV, 35kV and 10 kV. First power inlet TL1-1And a second power supply inlet line TL1-2Respectively pass through the first circuit breaker B1-1And a second breaker B1-2And connecting to the primary side of the traction transformer. The rated voltage of the bus of the traction substation is 27.5kV, and the middle of the bus is provided with a disconnecting switch GT1-96、GT1-97. 4 feeder lines are arranged between the traction substation bus and the upper and lower contact networks and are respectively connected to the first to fourth circuit breakers BT1-1、BT1-2、BT1-3、BT1-4. The traction substation is provided with an electric split-phase structure. Two feeder lines on the left side and the right side of the electric phase splitting are uniformly connected into an uplink line, and one feeder line is connected into a downlink line; and respectively pass through the isolating switch GT1-12、GT1-34Are connected with each other. For a division station S1The middle of the bus is provided with a disconnecting switch GS1-96、GS1-97. Bus of section stationAnd 4 feeder lines are arranged between the upper contact net and the lower contact net and are respectively connected into the circuit breaker BS1-1、BS1-2、BS1-3、BS1-4. There is an electrically split phase structure in the partition. Two feeders on the left side and the right side of the electric phase splitting are connected into an uplink line and a downlink line respectively.
Optionally, in some embodiments, wherein the SPC employs a single phase input/single phase output SPC when the secondary side of the traction transformer is two phase power; when the secondary side of the traction transformer is three-phase power, the SPC adopts three-phase input/single-phase output SPC.
It can be understood that the traction transformer and SPC in the all-through flexible traction power supply system compatible with out-of-phase power supply of the embodiment of the present application have two different structural wiring modes: if the secondary side of the traction transformer only has two phases of electricity, the connection form of the traction transformer can be a balanced connection form such as an SCOTT connection, a wood bridge connection, an impedance balanced connection and the like, or other connection forms such as Vv and the like, the SPC adopts single-phase input/single-phase output SPC, as shown in FIG. 4; if there are three phases of power on the secondary side of the traction transformer, such as a wired transformer such as YNd11, SPC uses a three phase input/single phase output SPC, as shown in FIG. 5.
Optionally, in some embodiments, the number of the traction transformers may be multiple, so as to control the parallel operation of multiple traction transformers.
It can be understood that a plurality of traction transformers in one traction substation can be operated in a main-standby mode or in a parallel mode. In the main and standby operation modes, all SPCs are connected to a traction transformer; and under the condition of the fault of the traction transformer, the other spare traction transformer supplies power. In the parallel operation mode, the traction transformers operate simultaneously, and the SPC is connected into different traction transformers; if a certain traction transformer fails, the power output of each traction substation can be coordinated through system-level control, so that the traction substation which normally operates nearby supports the traction transformer to fail. The advantage that the traction transformer can be operated in parallel is that: the capacity of the traction transformer is fully utilized, the standby capacity of the traction transformer is reduced, and the economical efficiency of the system is improved.
Optionally, in some embodiments, the electrical phase splitting structures include electrical phase splitting structures without circuit breakers and electrical phase splitting structures with circuit breakers, wherein the electrical phase splitting structures without circuit breakers are powered through in-phase by closure of traction substation or substation bus disconnectors and grid feeder circuit breakers.
That is to say, the electrical phase splitting in the fully through flexible traction power supply system compatible with the out-of-phase power supply of the embodiment of the present application can have two different structures: as shown in fig. 6, the electrical phase splitter is without a circuit breaker structure; as shown in fig. 7, the electrical phase splitter has a circuit breaker configuration.
Further, if there is not the circuit breaker in the electric phase separation structure, under the normal operating condition, draw substation, subregion institute all to adopt the bus-bar to link up the mode: through closing of a bus isolating switch and a corresponding breaker of a traction substation or a zone substation, the through in-phase power supply of a line is realized; the single-side bypass of the electric phase separation isolating switch of the traction substation and the subarea station is realized to realize that the electric phase separation zone-free electric zone is electrified, as shown in fig. 8, a black square in fig. 8 represents the state when the circuit breaker is closed, and a black circle represents the condition when the isolating switch is closed, and a person skilled in the art can adjust the closed state according to the actual condition, for example, the first circuit breaker B1-1And a second breaker B1-2Are all in a closed state, like the first breaker B1-1In an open state and a second circuit breaker B1-2Are all in a closed state, like the first breaker B1-1In a closed state and a second circuit breaker B1-2All in an off state, etc., and are not limited in particular herein.
When the bus of the traction substation breaks down or is disconnected, the contact network for the fault traction substation is communicated, and other traction substations and subareas are continuously communicated by the bus, so that continuous supply of through in-phase power supply can be ensured. As shown in fig. 9, the contact network penetration means the penetration of the line by the bypass on both sides of the electrical isolation switch (or circuit breaker), the black square in fig. 9 represents the state when the circuit breaker is closed, and the black circle represents the condition when the isolation switch is closed, and the person skilled in the art can adjust the closed state according to the actual situation, which is not limited specifically herein.
Further, as shown in fig. 10, when the network breaker on the traction substation has a fault, a single feeder line may be used to carry uplink and downlink lines, that is, the faulty breaker is disconnected, the disconnecting switch between adjacent feeder lines is closed, and the breaker on the other feeder line is used to carry uplink and downlink operations. It should be noted that, in fig. 10, the black square represents the closed state of the circuit breaker, and the black circle represents the closed state of the disconnector, and those skilled in the art can adjust the closed state according to the actual situation.
Further, as shown in fig. 11, when the network breaker on the substation fails, the failed substation adopts hybrid penetration, and the other traction substations and the substations continue to adopt bus penetration. The mixed penetration means that the upper (lower) line adopts a bus penetration mode, and the lower (upper) line adopts a contact net penetration mode. It should be noted that, in fig. 11, the black square represents the closed state of the circuit breaker, and the black circle represents the closed state of the disconnector, and those skilled in the art can adjust the closed state according to the actual situation.
Further, as shown in fig. 12, if there is a breaker in the electric phase separation structure, both the traction substation and the zoning station adopt a through-connection mode on the contact net under the normal operation condition. It should be noted that, in fig. 12, the black square represents the closed state of the circuit breaker, and the black circle represents the closed state of the disconnector, and those skilled in the art can adjust the closed state according to the actual situation.
Further, as shown in fig. 13, when the network breaker on the traction substation fails, a single feeder may be used to operate in an uplink or downlink mode. It should be noted that, in fig. 13, the black square represents the closed state of the circuit breaker, and the black circle represents the closed state of the disconnector, and those skilled in the art can adjust the closed state according to actual conditions.
Optionally, in some embodiments, all SPC in-out line switches, on-line feeder breakers, electrical phase splitting isolator double-sided switches, bus isolators are opened, and all on-line feeder breakers, secondary side feeder switches of the traction transformer are closed, so that the through in-phase power supply mode is switched to the out-phase power supply mode, thereby performing the out-phase operation mode and the out-phase cross-zone operation mode.
It can be understood that the fully through flexible traction power supply system compatible with out-of-phase power supply of the embodiment of the application can also be switched from a through in-phase power supply mode to an out-of-phase power supply mode. That is, no matter which through mode is adopted, if all SPCs are locked, all SPC in and out line switches, an internet feeder circuit breaker, a two-side switch of an electrical isolation switch (or a circuit breaker), and a bus isolating switch (or a circuit breaker) are opened; and then all the network feeder circuit breakers are closed, and the secondary side feeder switch of the traction transformer can be switched from a through in-phase power supply mode to an out-phase power supply mode, so that the compatibility of the through mode and the out-phase mode is realized, and the power supply reliability is improved under the complex fault condition.
In conclusion, the full-through type flexible traction power supply system compatible with out-phase power supply converts three-phase electricity of a public power grid into single-phase alternating current through a power electronic converter SPC formed by full-control devices; by adjusting the amplitude and the phase of each SPC outlet voltage, the voltage phase in the contact network is controlled to be close to a certain reference value, the dead zone of the contact network is eliminated, the full-line penetration of the contact network is realized, and the defects of an out-of-phase power supply mode which troubles the Chinese traction power supply technology for decades are overcome to a great extent.
According to the fully-through type flexible traction power supply system compatible with out-of-phase power supply, a dead zone is eliminated, the electric energy quality is obviously improved, a plurality of advantages are brought to the traction power supply system, and the problem of electric phase splitting is effectively solved; meanwhile, a specific wiring mode for penetrating through in-phase traction power supply is provided, the wiring mode can be compatible with out-phase power supply and penetrating in-phase power supply, and a technical scheme is provided for out-phase power supply electrified railway engineering to be transformed into penetrating in-phase power supply.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (6)
1. A fully pass-through flexible traction power supply system compatible with out-of-phase power supply, comprising: at least one traction substation and at least one zoning substation, wherein,
the traction substation includes:
a traction transformer;
the power supply comprises a first power supply inlet wire and a second power supply inlet wire, wherein the first power supply inlet wire and the second power supply inlet wire are divided
The first circuit breaker and the second circuit breaker are respectively connected with one side of the traction transformer;
a plurality of static power converters SPC, first and second ends of which are respectively connected to the traction transformer, and third ends of which are all grounded;
a second disconnecting switch disposed at a preset position of the first sectional bus, wherein the first sectional bus is connected to the traction transformer through third to sixth circuit breakers, and the first sectional bus is connected to fourth ends of the plurality of static power converters SPC;
the first feeder line and the fourth feeder line are respectively connected with the first sectional bus and an uplink of the overhead line system through a seventh circuit breaker and a tenth circuit breaker, and the second feeder line and the third feeder line are respectively connected with the first sectional bus and a downlink of the overhead line system through an eighth circuit breaker and a ninth circuit breaker;
the first end of the first electric phase separation structure is connected with a downlink of the overhead line system, and the second end of the first electric phase separation structure is connected with an uplink of the overhead line system;
the partitioning includes:
the second isolating switch is arranged at a preset position of the second sectional type bus;
the first end of the second electric phase separation structure is connected with the third end of the first electric phase separation structure through a descending line of the overhead line system, and the second end of the second electric phase separation structure is connected with the fourth end of the first electric phase separation structure through an ascending line of the overhead line system;
and the sixth feeder line and the eighth feeder line are respectively connected with the second sectional bus and a downlink of the overhead line system through a twelfth breaker and a fourteenth breaker.
2. The system of claim 1, further comprising:
a third isolator switch disposed between the first feed line and the second feed line;
a fourth isolation switch disposed between the third feed line and the fourth feed line.
3. The system of claim 1, wherein,
when the secondary side of the traction transformer is two-phase power, the SPC adopts single-phase input/single-phase output SPC;
when the secondary side of the traction transformer is three-phase power, the SPC adopts three-phase input/single-phase output SPC.
4. The system of claim 1, wherein the traction substation includes two traction transformers to control operation of the two traction transformers in parallel. The number of the traction transformers is multiple, so that the multiple traction transformers are controlled to run in parallel.
5. The system of claim 1, wherein the electrical phase splitting structures include electrical phase splitting structures without circuit breakers and electrical phase splitting structures with circuit breakers, wherein the electrical phase splitting structures without circuit breakers are powered through in-phase by closure of the traction substation or substation bus disconnectors and grid feeder circuit breakers.
6. The system of claim 5, wherein when the SPC latches, all SPC in and out line switches, network feeder breakers, electrical phase splitting isolator double sided switches, bus bar isolators are opened and all network feeder breakers, secondary side feeder switches of the traction transformer are closed to switch from through in-phase to out-of-phase supply.
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| CN202110293122.4A CN112865098B (en) | 2021-03-18 | 2021-03-18 | Full-through type flexible traction power supply system compatible with out-of-phase power supply |
| PCT/CN2022/081814 WO2022194293A1 (en) | 2021-03-18 | 2022-03-18 | Fully-through flexible traction power supply system compatible with heterogeneous power supply |
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| CN202110293122.4A CN112865098B (en) | 2021-03-18 | 2021-03-18 | Full-through type flexible traction power supply system compatible with out-of-phase power supply |
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| WO2022194293A1 (en) * | 2021-03-18 | 2022-09-22 | 中铁电气化局集团有限公司 | Fully-through flexible traction power supply system compatible with heterogeneous power supply |
| CN117477606A (en) * | 2023-12-27 | 2024-01-30 | 中国铁路设计集团有限公司 | Traction power supply power equalization and adjustment method and device based on bidirectional converter |
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