CN108173421B - Train passing neutral section uninterrupted power system of section station - Google Patents

Train passing neutral section uninterrupted power system of section station Download PDF

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CN108173421B
CN108173421B CN201611115950.4A CN201611115950A CN108173421B CN 108173421 B CN108173421 B CN 108173421B CN 201611115950 A CN201611115950 A CN 201611115950A CN 108173421 B CN108173421 B CN 108173421B
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transformer
train
phase
current
power supply
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CN108173421A (en
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张志学
胡景瑜
罗文广
何多昌
周方圆
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CRRC Zhuzhou Institute Co Ltd
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CRRC Zhuzhou Institute Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a power-off system of a train passing a neutral section of a section station, which comprises a first transformer, a back-to-back converter, a phase section and a power supply arm, wherein the input end of a primary coil of the first transformer is connected with the output end of the power supply arm, and the output end of the primary coil of the first transformer is grounded; a first secondary side coil of the first transformer is connected with the input end of the back-to-back converter; the input end of a second secondary coil of the first transformer is connected with the first output end of the back-to-back converter; the output end of the second secondary side coil is connected with the phase separation region; the second output end of the back-to-back converter is grounded; the back-to-back current transformer is used for adjusting the amplitude and/or phase of the voltage and the current of the phase separation area. The invention realizes the flexible transition of the voltage amplitude and/or the phase at the two ends of the split-phase area through the adjustment of the back-to-back converters, thereby realizing the uninterrupted power supply of the train in the split-phase area, and simultaneously reducing the use number of transformers, reducing the cost of the system and having smaller volume.

Description

Train passing neutral section uninterrupted power system of section station
Technical Field
The invention relates to the technical field of railway transportation equipment and power electronics, in particular to a power-off system for a sectionalized area passing train of a sectionalized station.
Background
In order to reduce negative sequence current injected into a power system and realize segmented current collection, an alternating-current traction power supply system adopts a connection mode of alternating phase sequence, so that a phase separation region exists. When a train passes through a phase separation region, no matter which scheme existing at home and abroad, such as manual switching technology, automatic on-column switch switching, automatic ground switching, automatic train power-off switching and the like, is adopted, the train is subjected to a power supply dead region with about 100ms for a period of time, system overvoltage and overcurrent easily occur in the power-off-power-restoration process, and the loss of the train speed can be caused due to the existence of the power supply dead region.
In order to solve the problem of how to make a train flexibly pass through a phase separation region, one current method is to realize electrification of a contact network of the phase separation region based on a back-to-back converter, and gradually change the voltage amplitude and/or phase of the phase separation region from the amplitude and/or phase of a previous section of electrified region (left power supply arm) to the amplitude or phase of a next section of electrified region (right power supply arm) during the period that the train enters and exits the phase separation region so as to realize flexible transition at two ends of the phase separation region, wherein the crossing region of the left power supply arm and the phase separation region and the crossing region of the right power supply arm and the phase separation region are transition regions.
Specifically, referring to fig. 1, fig. 1 is a schematic diagram illustrating a principle of a train passing through a phase separation zone flexibly in the prior art. In the prior art, a back-to-back converter is connected to a phase separation region through two transformers T1 and T2 connected in series, wherein a primary voltage (reference voltage) of the transformer T1 is a voltage of a left power supply arm, and a primary voltage (reference voltage) of the transformer T2 is a voltage of a right power supply arm, so that the back-to-back converter is connected to the phase separation region through the two transformers T1 and T2 connected in series, and the primary voltage (
Figure BDA0001173316410000011
Wherein,
Figure BDA0001173316410000012
is the voltage of the phase-splitting area,
Figure BDA0001173316410000013
is the secondary voltage of the transformer T1,
Figure BDA0001173316410000014
is the secondary voltage of the transformer T2,
Figure BDA0001173316410000015
is the output voltage of the back-to-back converter; the voltage of the phase separation region is jointly regulated by the back-to-back converter, the transformer T2 and the transformer T1
Figure BDA0001173316410000016
Amplitude and/or phase of the current in the phase-splitting region, so that the voltage in the phase-splitting region
Figure BDA0001173316410000017
Is supplied with voltage from the left supply arm during the train entering the phase separation
Figure BDA0001173316410000018
Slowly changing to the voltage of the right supply arm
Figure BDA0001173316410000019
And flexible transition of the amplitude and/or the phase of the voltage at two ends of the phase separation area is realized, so that the train flexibly passes through the phase separation area without power failure. However, in the prior art, the system for keeping the train from being powered off in the neutral section of the passing train adopts two transformers besides the transformers at two ends of the back-to-back converter, so that the cost and the volume of the whole system are increased.
Therefore, how to provide a partitioned uninterruptible power system for trains passing through the partitioned areas to solve the technical problems becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a train passing neutral section uninterrupted power system of a section station, which reduces the cost and has smaller volume while realizing the uninterrupted power of the train passing neutral section in the using process.
In order to solve the technical problem, the invention provides a power outage system for a train passing through a neutral section of a section station, which comprises a first transformer, a back-to-back converter, a neutral section and a power supply arm, wherein:
the input end of the primary coil of the first transformer is connected with the output end of the power supply arm, and the output end of the primary coil of the first transformer is grounded;
a first secondary side coil of the first transformer is connected with the input end of the back-to-back converter;
the input end of a second secondary coil of the first transformer is connected with the first output end of the back-to-back converter; the output end of the second secondary side coil is connected with the phase separation region;
a second output end of the back-to-back converter is grounded;
the back-to-back current transformer is used for adjusting the amplitude and/or the phase of the voltage and the current of the phase separation area.
Preferably, the system further comprises a second transformer, wherein:
the input end of the primary coil of the second transformer is connected with the output end of the back-to-back converter, the first end of the secondary coil of the second transformer is connected with the input end of the second secondary coil, and the second end of the secondary coil of the second transformer is grounded.
Preferably, the back-to-back converter includes a rectifier, a voltage stabilizing capacitor and an inverter, wherein:
the input end of the rectifier is used as the input end of the back-to-back converter, the output end of the rectifier is connected with the input end of the inverter after being connected with the voltage stabilizing capacitor in parallel, and the output end of the inverter is used as the output end of the back-to-back converter.
Preferably, the back-to-back converter further comprises a filter, wherein:
and the voltage stabilizing capacitor is connected with the input end of the inverter after being connected with the filter in parallel.
Preferably, the filter is an LC filter.
Preferably, the second transformer is an isolation transformer.
Preferably, the back-to-back converter is based on a two-level or three-level back-to-back converter.
Preferably, the ratio of the number of turns of the primary winding of the first transformer to the number of turns of the second secondary winding of the first transformer is 1: 1.
preferably, the power supply arm is a power supply arm on a train exit side.
Preferably, the specific process of adjusting the amplitude and/or phase of the current of the phase separation region according to any one of the above methods is:
by regulating the current i of the phase separation zone0Making the current of a transition region in the phase separation region be iA+i0＝IcWherein i isAInstantaneous value of the current of the supply arm of the train in the transition zone, IcThe current required for the train to run;
when the train enters a transition area at the front end of the subarea, the instantaneous value of the current of the power supply arm at which the transition area is located is iA＝Ic，i0When the train runs out of the transition area at the front end of the subarea, the instantaneous value of the current of the power supply arm at the transition area is iA＝0，i0＝Ic；
When the train enters a transition area at the rear end of the subarea, the instantaneous value of the current of the power supply arm at which the transition area is located is iA＝0，i0＝IcWhen the train runs out of the transition area at the rear end of the subarea, the instantaneous value of the current of the power supply arm at which the transition area is located is iA＝Ic，i0＝0。
The invention provides a power-off system for a train passing through a split-phase area of a division station, which comprises a first transformer, a back-to-back converter, the split-phase area and a power supply arm, wherein: the input end of the primary coil of the first transformer is connected with the output end of the power supply arm, and the output end of the primary coil of the first transformer is grounded; a first secondary side coil of the first transformer is connected with the input end of the back-to-back converter; the input end of a second secondary coil of the first transformer is connected with the first output end of the back-to-back converter; the output end of the second secondary side coil is connected with the phase separation region; the second output end of the back-to-back converter is grounded; the back-to-back current transformer is used for adjusting the amplitude and/or phase of the voltage and the current of the phase separation area.
On the basis of adjusting the amplitude and/or the phase of the current of the phase separation area through the back-to-back converter, because the amplitude/the phase of the voltage at two ends of the phase separation area are theoretically consistent, and only certain amplitude/phase difference exists when the load is different, but the amplitude/the phase difference is not large, the invention adopts a transformer, namely a first transformer, the voltage of a power supply arm at one side of the phase separation area is used as a reference voltage, the amplitude and/or the phase of the voltage of the phase separation area are changed from the amplitude and/or the phase of the voltage of the power supply arm at the train driving side to the amplitude and/or the phase of the voltage of the power supply arm at the train driving side after the output voltage of the back-to-back converter is superposed with the amplitude and/or the phase of the voltage of a second secondary side coil of the first transformer, and the flexible transition of the voltage of the two ends and, therefore, the train is not powered off in the passing neutral section. Compared with the prior art, the invention realizes the uninterrupted power supply of the train in the neutral section, and simultaneously reduces the cost and the volume of the system because of reducing the use number of the transformers.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating a prior art method for achieving flexible train passing through a phase separation zone;
FIG. 2 is a schematic structural diagram of a uninterruptible power system of a partitioned train passing through a partitioned area according to the present invention;
FIG. 3 is a schematic structural diagram of a train passing neutral section uninterruptible power system of another section provided by the invention;
fig. 4 is a schematic diagram of transition region current regulation provided by the present invention.
Detailed Description
The core of the invention is to provide a train passing neutral section uninterrupted power system of a section station, which reduces the cost and has smaller volume while realizing the uninterrupted power of the train passing neutral section in the using process.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Example one
Referring to fig. 2, fig. 2 is a schematic structural diagram of a uninterruptible power system of a sectionalized train passing section provided by the present invention.
This system includes first transformer 1, back-to-back converter 2, phase-separating zone 3 and power supply arm 4, wherein:
the input end of the primary coil of the first transformer 1 is connected with the output end of the power supply arm 4, and the output end of the primary coil of the first transformer 1 is grounded;
a first secondary side coil of the first transformer 1 is connected with the input end of the back-to-back converter;
the input end of a second secondary coil of the first transformer 1 is connected with the first output end of the back-to-back converter 2; the output end of the second secondary side coil is connected with the phase separation area 3;
the second output end of the back-to-back converter 2 is grounded;
the back-to-back converter 2 is used to adjust the amplitude and/or phase of the voltage and current of the phase-splitting region 3.
It should be noted that, since the voltage amplitudes of the supply arms at both ends of the phase-splitting area 3 of the sub-area are theoretically the same and there is a small phase difference only when the loads are different, the present invention uses only one transformer, i.e., the first transformer 1. When the train enters a phase separation zone 3 of the zone station, the train is supplied with power by a feeder line of a substation, namely, a power supply arm at the input side of the train, the train is supplied with power by a first transformer 1 and a back-to-back converter 2 together, and the voltage of the phase separation zone 3 is gradually transited from the voltage of the power supply arm at the front end of the phase separation zone 3 to the voltage of the power supply arm at the rear end of the phase separation zone 3 by adjusting the back-to-back converter 2 in the period, so that the adjustment is completed before the train exits the phase separation zone 3, and the train is ensured to stably enter the phase separation zone 3 and stably exit the phase separation zone 3.
Specifically, the first transformer 1 converts the voltage of the power supply arm 4 at one end of the phase separation region 3
Figure BDA0001173316410000051
(the voltage is generally 27.5kV) as a reference voltage, the first secondary winding of the first transformer 1 outputs the voltage of the first secondary winding to the back-to-back converter 2, and the regulated voltage is output by regulating the back-to-back converter 2
Figure BDA0001173316410000052
The output of the second secondary winding of the first transformer 1 has a voltage of
Figure BDA0001173316410000053
Since the input end of the second secondary winding of the first transformer 1 is connected to the output end of the back-to-back converter 2 and the output end of the second secondary winding is connected to the voltage end of the phase separation region 3, the voltage of the phase separation region 3
Figure BDA0001173316410000054
When a train drives from one end of the phase separation section 3 to the other (e.g. from the left end to the right end), the voltage of the phase separation section 3 is regulated by the back-to-back converter 2
Figure BDA0001173316410000055
Amplitude and/or phase of the phase separation section 3
Figure BDA0001173316410000056
The amplitude and/or the phase of the voltage of the left power supply arm are slowly changed to the amplitude and/or the phase of the voltage of the right power supply arm along with the train running into the phase separation area 3, and the train can flexibly pass through the phase separation area 3 without power failure.
Of course, the back-to-back converter 2 can adjust the amplitude and/or phase of the voltage of the phase-splitting region 3, and also can adjust the amplitude and/or phase of the current of the phase-splitting region 3 according to the requirement.
The invention provides a power-off system for a train passing through a split-phase area of a division station, which comprises a first transformer, a back-to-back converter, the split-phase area and a power supply arm, wherein: the input end of the primary coil of the first transformer is connected with the output end of the power supply arm, and the output end of the primary coil of the first transformer is grounded; a first secondary side coil of the first transformer is connected with the input end of the back-to-back converter; the input end of a second secondary coil of the first transformer is connected with the first output end of the back-to-back converter; the output end of the second secondary side coil is connected with the phase separation region; the second output end of the back-to-back converter is grounded; the back-to-back current transformer is used for adjusting the amplitude and/or phase of the voltage and the current of the phase separation area.
On the basis of adjusting the amplitude and/or the phase of the current of the phase separation area through the back-to-back converter, because the amplitude/the phase of the voltage at two ends of the phase separation area are theoretically consistent, and only certain amplitude/phase difference exists when the load is different, but the amplitude/the phase difference is not large, the invention adopts a transformer, namely a first transformer, the voltage of a power supply arm at one side of the phase separation area is used as a reference voltage, the amplitude and/or the phase of the voltage of the phase separation area are changed from the amplitude and/or the phase of the voltage of the power supply arm at the train driving side to the amplitude and/or the phase of the voltage of the power supply arm at the train driving side after the output voltage of the back-to-back converter is superposed with the amplitude and/or the phase of the voltage of a second secondary side coil of the first transformer, and the flexible transition of the voltage of the two ends and, therefore, the train is not powered off in the passing neutral section. Compared with the prior art, the invention realizes the uninterrupted power supply of the train in the neutral section, and simultaneously reduces the cost and the volume of the system because of reducing the use number of the transformers.
Example two
Referring to fig. 3, fig. 3 is a schematic structural diagram of a train passing neutral section uninterruptible power system of another section provided by the present invention, based on the first embodiment:
preferably, the system further comprises a second transformer 5, wherein:
the input end of the primary coil of the second transformer 5 is connected with the output end of the back-to-back converter 2, the first end of the secondary coil of the second transformer 5 is connected with the input end of the second secondary coil, and the second end of the secondary coil of the second transformer 5 is grounded.
Specifically, the voltage to be output by the back-to-back converter 2
Figure BDA0001173316410000061
The voltage is transmitted to a second secondary side coil of the first transformer 1 after passing through a second transformer 5, and the voltage output by the second transformer 5 is
Figure BDA0001173316410000062
At this time, the voltage of the phase separation region 3
Figure BDA0001173316410000063
The method is suitable for the condition that the voltage amplitude/phase difference between two ends of the partition is large, and the application range of the system is widened.
Preferably, the back-to-back converter 2 includes a rectifier 21, a voltage-stabilizing capacitor 22 and an inverter 23, wherein:
the input end of the rectifier 21 is used as the input end of the back-to-back converter 2, the output end of the rectifier 21 is connected with the input end of the inverter 23 after being connected with the voltage-stabilizing capacitor 22 in parallel, and the output end of the inverter 23 is used as the output end of the back-to-back converter 2.
Specifically, the rectifier 21 rectifies the voltage output by the first secondary winding of the first transformer 1, converts the alternating current into direct current, outputs the direct current to the inverter 23 after passing through the voltage stabilizing capacitor 22, and the inverter 23 converts the stabilized direct current into alternating current to output the alternating current to the second transformer 5, and adjusts the amplitude and/or phase of the voltage according to specific needs.
It should be noted that the input side of the back-to-back converter 2 may adopt a controllable device or an uncontrollable device, which may be determined according to specific situations, and the present invention is not particularly limited herein, and the purpose of the present invention can be achieved.
Preferably, the back-to-back converter 2 further comprises a filter 24, wherein:
the voltage stabilizing capacitor 22 is connected in parallel with the filter 24 and then connected to the input terminal of the inverter 23.
Specifically, the back-to-back converter 2 provided in the present application may further include a filter 24 for filtering the voltage output by the voltage stabilizing capacitor 22 to eliminate the interference signal, so that the obtained voltage signal is more accurate.
Preferably, the filter 24 is an LC filter.
It should be noted that the filter 24 may be an LC filter.
Of course, the filter 24 is not limited to the LC filter, and other filters, such as an LCL filter, may be used, and the specific form of the filter is not limited herein, and the object of the present invention can be achieved.
Preferably, the second transformer 5 is an isolation transformer.
Specifically, the second transformer 5 is a transformer with an isolation property, which is beneficial to improving the reliability of the uninterrupted system of the train passing through the phase separation zone 3 in the whole zone.
Preferably, the back-to-back converter 2 is a two-level or three-level based back-to-back converter 2.
Of course, the specific structural form of the back-to-back converter 2 is not limited to two levels or three levels, and other structural forms of back-to-back converters may be adopted.
Preferably, the ratio of the number of turns of the primary winding of the first transformer 1 to the number of turns of the second secondary winding of the first transformer 1 is 1: 1.
it should be noted that the ratio of the number of turns of the primary winding of the first transformer 1 to the number of turns of the second secondary winding of the first transformer 1 may also be other values, and the specific value may be determined according to actual needs.
Preferably, the power supply arm 4 is a power supply arm on the train exit side.
Specifically, the power supply arm 4 in the present application is a power supply arm on the train exit side, for example, when the train travels from the left end to the right end, the power supply arm on the train exit side is a right power supply arm, that is, the reference voltage of the first transformer 1 is provided by the power supply arm on the train exit side (the right power supply arm); of course, the supply arm 4 may also be a supply arm on the train entry side, i.e. the reference voltage of the first transformer 1 may also be provided by the supply arm on the train entry side.
It should be noted that the reference voltage of the first transformer 1 may also be synthesized by the voltages of the power supply arms at the two ends of the phase separation region 3 according to a certain proportion, and the specific value of the proportion may be determined according to the actual situation.
Preferably, the specific process of adjusting the amplitude and/or phase of the current of the phase separation region 3 as described in any one of the above is:
by regulating the current i of the phase separation zone 30Make the current of the transition region in the phase separation region 3 be iA+i0＝IcWherein i isAInstantaneous value of current of power supply arm for transition zone of train in transition zone, IcThe current required by the train running;
when the train enters the transition area at the front end of the subarea, the instantaneous value of the current of the power supply arm at the transition area is iA＝Ic，i0When the train runs out of the transition area at the front end of the subarea, the instantaneous value of the current of the power supply arm at the transition area is iA＝0，i0＝Ic；
When the train enters the transition area at the rear end of the subarea, the instantaneous value of the current of the power supply arm at the transition area is iA＝0，i0＝IcWhen the train is out of the transition area at the rear end of the subarea, the instantaneous value of the current of the power supply arm at the transition area is iA＝Ic，i0＝0。
Because the current may suddenly change when the train passes through the transition region, and the overvoltage is easily caused, the current of the phase-change region 3 needs to be adjusted through the adjusting function of the back-to-back converter 2, and the current of the transition region is further adjusted, so that the train can smoothly pass through the current of the train when the train passes through the transition region.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating transition region current regulation according to the present invention.
Specifically, the transition region is MD in the figureaSegment and MDbAnd (4) section. Can adjust the current i of the phase separation zone 30And the current i of the power supply arm in which the transition zone is locatedALet iA+i0＝IcI.e. to make the electricity supply of the transition zone when the train is driving into the transition zoneFlows as list current Ic。
As shown in figure 4, before the train enters the transition area, the current of the train is provided by a power supply arm of the transition area, and after the train enters the transition area, the current I of the phase separation area 3 is regulated by the train passing through the phase separation area 3 uninterrupted power system of the train of the phase separation area0Make it increase smoothly from 0, the current I of the power supply arm of the transition zoneAMake it from IcCorresponding smooth decrease, iA+i0＝IcTherefore, the smooth transition of the train current is realized, the sudden change impact of the current is reduced, and the overvoltage level is reduced.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a train of subregion passes neutral section uninterrupted power system which characterized in that, the system includes first transformer, back-to-back converter, phase-separating district and power supply arm, wherein:
the input end of the primary coil of the first transformer is connected with the output end of the power supply arm, and the output end of the primary coil of the first transformer is grounded;
a first secondary side coil of the first transformer is connected with the input end of the back-to-back converter;
the input end of a second secondary coil of the first transformer is connected with the first output end of the back-to-back converter; the output end of the second secondary side coil is connected with the phase separation region;
a second output end of the back-to-back converter is grounded;
the back-to-back current transformer is used for adjusting the amplitude and/or the phase of the voltage and the current of the phase separation area.
2. The zoned train-over-zoning uninterruptible power system of claim 1, further comprising a second transformer, wherein:
the input end of the primary coil of the second transformer is connected with the output end of the back-to-back converter, the first end of the secondary coil of the second transformer is connected with the input end of the second secondary coil, and the second end of the secondary coil of the second transformer is grounded.
3. The sectionalized train split-phase section uninterruptible power system of claim 2, wherein the back-to-back converter comprises a rectifier, a voltage stabilizing capacitor and an inverter, wherein:
the input end of the rectifier is used as the input end of the back-to-back converter, the output end of the rectifier is connected with the input end of the inverter after being connected with the voltage stabilizing capacitor in parallel, and the output end of the inverter is used as the output end of the back-to-back converter.
4. The sectionalized train split-phase section uninterruptible power system of claim 3, wherein the back-to-back converter further comprises a filter, wherein:
and the voltage stabilizing capacitor is connected with the input end of the inverter after being connected with the filter in parallel.
5. The sectionalized train split-section uninterruptible power system of claim 4, wherein the filter is an LC filter.
6. The sectionalized train split-section uninterruptible power system of claim 2, wherein the second transformer is an isolation transformer.
7. The sectionalized train split-phase section uninterruptible power system according to claim 2, wherein the back-to-back converter is a two-level or three-level based back-to-back converter.
8. The sectionalized train split-section uninterruptible power system according to claim 1, wherein a ratio of a number of turns of a primary winding of the first transformer to a number of turns of a second secondary winding of the first transformer is 1: 1.
9. the sectionalized train passing neutral section uninterruptible power system of claim 1, wherein the power supply arm is a power supply arm on a train exit side.
10. The sectionalized train split-phase section uninterruptible power system according to any one of claims 1 to 9, wherein the specific process of adjusting the amplitude and/or phase of the current of the split-phase section is as follows:
by regulating the current i of the phase separation zone0Making the current of a transition region in the phase separation region be iA+i0＝IcWherein i isAInstantaneous value of the current of the supply arm of the train in the transition zone, IcThe current required for the train to run;
when the train enters a transition area at the front end of the subarea, the instantaneous value of the current of the power supply arm at which the transition area is located is iA＝Ic，i0When the train runs out of the transition area at the front end of the subarea, the instantaneous value of the current of the power supply arm at the transition area is iA＝0，i0＝Ic；
When the train enters a transition area at the rear end of the subarea, the instantaneous value of the current of the power supply arm at which the transition area is located is iA＝0，i0＝IcWhen the train runs out of the transition area at the rear end of the subarea, the instantaneous value of the current of the power supply arm at which the transition area is located is iA＝Ic，i0＝0。
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CN109625007B (en) * 2018-12-27 2019-10-01 西南交通大学 A kind of novel grounded system of bullet train, automatic control system and control method

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