CN109733252B - Ground automatic neutral section passing circuit and control method, control device and control system thereof - Google Patents
Ground automatic neutral section passing circuit and control method, control device and control system thereof Download PDFInfo
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- CN109733252B CN109733252B CN201910012451.XA CN201910012451A CN109733252B CN 109733252 B CN109733252 B CN 109733252B CN 201910012451 A CN201910012451 A CN 201910012451A CN 109733252 B CN109733252 B CN 109733252B
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Abstract
The invention provides a ground automatic neutral section passing circuit and a control method, a control device and a control system thereof. The high-voltage winding of a first transformer of the ground automatic neutral section passing circuit is connected with a first power supply arm; the first end of the alternating current/direct current converter is connected with a low-voltage winding of the first transformer; the current sensor is respectively connected with the first end of the alternating current/direct current converter and the low-voltage winding of the first transformer; the second end of the direct current/alternating current converter is connected with the second end of the alternating current/direct current converter; two ends of the voltage sensor are connected with the second end of the direct current/alternating current converter and the second end of the alternating current/direct current converter; the low-voltage winding of the second transformer is connected with the first end of the direct current/alternating current converter, and the high-voltage winding of the second transformer is connected with the neutral region power supply arm; the alternating current/direct current converter and the direct current/alternating current converter are H-bridges comprising 4 switching devices, and can enable trains to pass through the phase separation region quickly and smoothly.
Description
Technical Field
The invention relates to the field of automatic passing neutral section, in particular to a ground automatic passing neutral section circuit and a control method, a control device and a control system thereof.
Background
The primary side of the traction substation of the electrified railway in China is generally three-phase 110kV or 220kV, in order to balance the load power of three-phase voltage, the overhead contact system of the electrified railway in China adopts single-phase 25kV section phase-change power supply, and a section of non-electric phase separation area exists between adjacent power supply sections with different voltage phases.
Before the train enters the phase separation area, the train needs to perform actions on the train according to the signals of the position sensors embedded on the ground: the traction power is reduced to 0, the four-quadrant converter is blocked, a vacuum circuit breaker on the train is cut off, and a traction inverter is switched to a micro-electric system medium voltage maintaining working condition. The above action aims at two: 1. the traction power is reduced to 0, the four-quadrant converter is blocked, the train traction system can be ensured not to take current from a contact network, and the primary side current of a traction transformer is 0 at the moment, so that no impact is caused when a train vacuum circuit breaker is cut off; 2. the traction inverter is switched to a micro-electric system working condition, so that the constant direct current voltage in the middle of the traction system can be maintained, and the auxiliary system normally gets electricity from the middle direct current link without being influenced, thereby ensuring that the auxiliary system is not powered off when the train passes through a neutral section.
The safety, stability and no power failure of an auxiliary system are the basic requirements of a train passing through a neutral section. In recent years, with the rapid development of high-speed railways, a plurality of ground automatic passing phase schemes are proposed in succession. Most of the proposed ground auto-passing schemes require several tens of multi-level semiconductor devices or modules to operate in series-parallel, subject to the limitations of power semiconductor devices. In addition, because the phases of the front and rear power supply arms are inconsistent, the action of most ground automatic neutral section passing devices can cause over-current or over-voltage impact of a train traction system. Therefore, the device is high in cost and low in reliability, basically has no feasibility of application in the railway field, and cannot ensure that a train passes through a phase separation region quickly and stably.
Disclosure of Invention
The embodiment of the invention mainly aims to provide a ground automatic neutral section passing circuit, a control method, a control device and a control system thereof, so that a train can quickly and stably pass through a neutral section; the invention has simple structure, low cost and high reliability, and has feasibility of application in the railway field.
In order to achieve the above object, an embodiment of the present invention provides a ground auto-neutral section passing circuit, which is respectively connected to a first power supply arm and a neutral section power supply arm, and includes: the system comprises a first transformer, a current sensor, an alternating current/direct current converter, a voltage sensor, a direct current/alternating current converter and a second transformer;
the high-voltage winding of the first transformer is connected with the first power supply arm and used for carrying out voltage transformation ratio on the voltage of the first power supply arm to obtain a first alternating-current side voltage;
the first end of the alternating current/direct current converter is connected with a low-voltage winding of the first transformer and used for converting the first alternating-current side voltage into direct-current side voltage;
the current sensor is respectively connected with the first end of the alternating current/direct current converter and the low-voltage winding of the first transformer and is used for measuring alternating current side current;
the second end of the direct current/alternating current converter is connected with the second end of the alternating current/direct current converter and used for converting the direct current side voltage into a second alternating current side voltage;
the two ends of the voltage sensor are connected with the second end of the direct current/alternating current converter and the second end of the alternating current/direct current converter and used for measuring the voltage of the direct current side;
a low-voltage winding of the second transformer is connected with the first end of the direct current/alternating current converter, and a high-voltage winding of the second transformer is connected with the neutral region power supply arm and used for carrying out voltage transformation ratio on the voltage of the second alternating current side to obtain the voltage of the neutral region power supply arm;
the ac/dc converter and the dc/ac converter are both H-bridges comprising 4 switching devices.
The embodiment of the invention also provides a control method of the ground automatic neutral-section passing circuit, which comprises the following steps:
obtaining alternating current side current;
judging whether the alternating current side current is less than or equal to a first preset current threshold value or not;
when the alternating current side current is smaller than or equal to a first preset current threshold value, controlling the direct current/alternating current converter to adjust the voltage of the neutral region power supply arm to be the same as the voltage of the first power supply arm in an open-loop control mode;
when the alternating current side current is larger than a first preset current threshold value, controlling the direct current/alternating current converter to adjust the voltage of the neutral region power supply arm from the voltage of the first power supply arm to be the same as the voltage of the second power supply arm in an open-loop control mode within preset time; the preset time is the quotient of the length of the dead zone and the train speed.
The embodiment of the invention also provides a control device of the ground automatic neutral-section passing circuit, which comprises:
an alternating-current-side current acquisition unit for acquiring an alternating-current-side current;
the first judgment unit is used for judging whether the alternating current side current is less than or equal to a first preset current threshold value or not;
the first control unit is used for controlling the direct current/alternating current converter to adjust the voltage of the neutral region power supply arm to be the same as the voltage of the first power supply arm in an open-loop control mode;
and the second control unit is used for controlling the direct current/alternating current converter to enable the voltage of the neutral region power supply arm to be adjusted to be the same as the voltage of the second power supply arm from the voltage of the first power supply arm in an open-loop control mode within a preset time.
The embodiment of the invention also provides a control system of the ground automatic neutral-section passing circuit, which comprises;
the ground automatic neutral-section passing circuit as described above;
a control device of the ground automatic neutral-section passing circuit;
the control device of the ground automatic passing neutral section circuit is respectively connected with a current sensor, an alternating current/direct current converter, a voltage sensor, a direct current/alternating current converter, an overvoltage protection device, a first vacuum circuit breaker and a second vacuum circuit breaker in the ground automatic passing neutral section circuit.
The ground automatic neutral section passing circuit, the control method, the control device and the control system thereof can enable a train to rapidly and stably pass through the neutral section; the invention has simple structure, low cost and high reliability, and has feasibility of application in the railway field.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly introduced 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 that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a ground auto-passing neutral-section circuit in a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a ground auto-passing neutral-section circuit in a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a ground auto-passing neutral-section circuit in a third embodiment of the present invention;
FIG. 4 is a schematic diagram of a ground auto-passing neutral-section circuit in a fourth embodiment of the present invention;
FIG. 5 is a flow chart of a method for controlling a ground auto-passing neutral section circuit according to an embodiment of the present invention;
FIG. 6 is a block diagram showing the structure of a control device of the ground auto-passing neutral section circuit according to the first embodiment of the present invention;
FIG. 7 is a block diagram showing the structure of a control device of a ground auto-passing neutral section circuit according to a second embodiment of the present invention;
fig. 8 is a schematic diagram of a control system for a ground auto-passing neutral section circuit in an embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, 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 invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be embodied as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
In view of the fact that the prior art is high in cost and low in reliability, basically does not have feasibility of application in the railway field, and cannot ensure that a train quickly and stably passes through a phase separation area, the embodiment of the invention provides the ground automatic neutral section passing circuit which is simple in structure, low in cost, high in reliability, has feasibility of application in the railway field, and can enable the train to quickly and stably pass through the phase separation area. The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a ground auto-passing neutral-section circuit in a first embodiment of the present invention. As shown in fig. 1, the ground automatic neutral-section passing circuit is respectively connected with a first power supply arm 1 and a neutral region power supply arm 2, and comprises: a first transformer 4, a current sensor 7, an AC/DC converter 6, a voltage sensor 9, a DC/AC converter 14 and a second transformer 5; a second supply arm 3 is also included in figure 1. The train passes through the neutral zone power supply arm 2, transitioning from the first power supply arm 1 to the second power supply arm 3.
A high-voltage winding of the first transformer 4 (H of the first transformer 4 in fig. 1) is connected to the first power supply arm 1, and is configured to perform voltage transformation ratio on the voltage of the first power supply arm 1 to obtain a first ac-side voltage;
a first end of the ac/dc converter 6 is connected to the low voltage winding of the first transformer 4 (L of the first transformer 4 in fig. 1) for converting the first ac side voltage into a dc side voltage; the alternating current/direct current converter 6 adopts a double closed-loop control strategy, controls the power factor of an alternating current side to be 1 and controls the voltage of a direct current side to be constant by acquiring alternating current side current measured by the current sensor 7 and direct current side voltage measured by the voltage sensor 9.
The current sensor 7 is respectively connected with the first end of the alternating current/direct current converter 6 and the low-voltage winding of the first transformer 4 and is used for measuring alternating current side current;
a second end of the dc/ac converter 14 is connected to a second end of the ac/dc converter 6 for converting the dc side voltage into a second ac side voltage; wherein the dc/ac converter 14 is controlled open loop.
Both ends of the voltage sensor 9 are connected with the second end of the DC/AC converter 14 and the second end of the AC/DC converter 6, and are used for measuring the DC side voltage; as shown in fig. 1, the voltage sensor 9 is connected in parallel with the dc/ac converter 14 and the ac/dc converter 6.
A low-voltage winding (L of the second transformer 5 in fig. 1) of the second transformer 5 is connected to the first end of the dc/ac converter 14, and a high-voltage winding (H of the second transformer 5 in fig. 1) of the second transformer is connected to the neutral region power supply arm 2, so as to perform voltage transformation ratio on the second ac side voltage, and obtain a voltage of the neutral region power supply arm 2;
the ac/dc converter 6 and the dc/ac converter 14 are each an H-bridge (not shown in fig. 1) comprising 4 switching devices.
The voltage of the high-voltage windings of the first transformer 4 and the second transformer 5 is 25kV, and the voltage of the low-voltage windings of the first transformer 4 and the second transformer 5 is equivalent to the voltage of the alternating current side of a four-quadrant converter on the train.
Fig. 2 is a schematic diagram of a ground auto-passing neutral-section circuit in a second embodiment of the present invention. As shown in fig. 2, the ground automatic neutral-section passing circuit further includes: an overvoltage protection device 8; the overvoltage protection is connected in parallel with the voltage sensor 9.
Fig. 3 is a schematic diagram of a ground auto-passing neutral-section circuit in a third embodiment of the present invention. As shown in fig. 3, the ground automatic neutral-section passing circuit further includes: a first vacuum interrupter 10 and a second vacuum interrupter 11;
one end of the first vacuum circuit breaker 10 is connected with the first power supply arm 1, and the other end of the first vacuum circuit breaker 10 is connected with a high-voltage winding of the first transformer 4;
one end of the second vacuum interrupter 11 is connected to the neutral zone supply arm 2, and the other end of the first vacuum interrupter 11 is connected to the high voltage winding of the second transformer 5.
Fig. 4 is a schematic diagram of a ground auto-passing neutral-section circuit according to a fourth embodiment of the present invention. As shown in fig. 4, the ground automatic neutral-section passing circuit further includes: a first fuse 12 and a second fuse 13;
one end of the first fuse 12 is connected to the first power supply arm 1, and the other end of the first fuse 12 is connected to the first vacuum circuit breaker 10;
one end of the second fuse 13 is connected to the neutral zone supply arm 2 and the other end of the second fuse 13 is connected to the second vacuum interrupter 11.
Based on the same inventive concept, the embodiment of the invention also provides a control method of the ground automatic neutral-section passing circuit. Fig. 5 is a flow chart of a control method of the ground auto-passing neutral section circuit in the embodiment of the invention. As shown in fig. 5, the control method of the ground automatic neutral-section passing circuit includes:
s101: and obtaining the alternating current.
S102: and judging whether the alternating current side current is less than or equal to a first preset current threshold value or not.
S103: and when the alternating current side current is less than or equal to a first preset current threshold value, controlling the direct current/alternating current converter to adjust the voltage of the neutral region power supply arm to be the same as the voltage of the first power supply arm in an open-loop control mode.
S104: when the alternating current side current is larger than a first preset current threshold value, the direct current/alternating current converter is controlled to enable the voltage of the neutral region power supply arm to be adjusted to be the same as the voltage of the second power supply arm from the voltage of the first power supply arm in an open-loop control mode within a preset time.
The preset time is the quotient of the length of the dead zone and the train speed.
Specifically, when the train is located in the first power supply arm 1 and does not enter the neutral power supply arm 2, the second ac-side voltage output by the dc/ac converter 14 is the same as the ac voltage of the first power supply arm 1 after being converted by the second transformer 5. When the train enters the neutral zone power supply arm 2 from the first power supply arm 1, the alternating current side current detected by the current sensor 7 is increased, and at the moment, the period of a switching device of the direct current/alternating current converter 14 is controlled, and a second alternating current side voltage is output, wherein the second alternating current side voltage is the same as the alternating current voltage of the second power supply arm 3 after being converted by the second transformer 5; when a train enters the second power supply arm 3 from the neutral zone power supply arm 2, the alternating-current side current detected by the current sensor 7 decreases, and at this time, the period of the switching device of the dc/ac converter 14 is controlled to output a second alternating-current side voltage which is the same as the alternating-current voltage of the first power supply arm 1 after being converted by the second transformer 5.
The execution main body of the control method of the ground automatic neutral-section passing circuit shown in fig. 5 can be a computer. As can be seen from the process shown in fig. 5, the control method of the ground auto-passing neutral-section circuit according to the embodiment of the present invention first obtains the ac-side current, and then determines whether the ac-side current is less than or equal to the first preset current threshold; when the alternating current side current is smaller than or equal to a first preset current threshold value, controlling the direct current/alternating current converter to adjust the voltage of the neutral region power supply arm to be the same as the voltage of the first power supply arm in an open-loop control mode; when the alternating current side current is larger than a first preset current threshold value, the direct current/alternating current converter is controlled to enable the voltage of the neutral region power supply arm to be adjusted to be the same as the voltage of the second power supply arm from the voltage of the first power supply arm in an open-loop control mode within preset time, the feasibility of railway field application is achieved, and trains can rapidly and stably pass through the phase separation region.
In one embodiment, the method further comprises:
acquiring direct-current side voltage;
judging whether the voltage of the direct current side is greater than a first preset voltage threshold value or not;
and when the voltage of the direct current side is greater than a first preset voltage threshold value, closing the overvoltage protection device.
In one embodiment, the method further comprises:
judging whether the alternating current side current is larger than a second preset current threshold value or not;
judging whether the voltage of the direct current side is smaller than a second preset voltage threshold value or not;
and when the current on the alternating current side is greater than a second preset current threshold value or the voltage on the direct current side is less than a second preset voltage threshold value, the first vacuum circuit breaker and the second vacuum circuit breaker are disconnected.
In summary, the control method of the ground auto-passing neutral-section circuit according to the embodiment of the present invention first obtains the ac side current, and then determines whether the ac side current is less than or equal to a first preset current threshold; when the alternating current side current is smaller than or equal to a first preset current threshold value, controlling the direct current/alternating current converter to adjust the voltage of the neutral region power supply arm to be the same as the voltage of the first power supply arm in an open-loop control mode; when the alternating current side current is larger than a first preset current threshold value, the direct current/alternating current converter is controlled to enable the voltage of the neutral region power supply arm to be adjusted to be the same as the voltage of the second power supply arm from the voltage of the first power supply arm in an open-loop control mode within preset time, the feasibility of railway field application is achieved, and trains can rapidly and stably pass through the phase separation region.
Based on the same inventive concept, the embodiment of the invention also provides a control device of the ground automatic neutral-section passing circuit, and as the principle of solving the problems of the device is similar to the control method of the ground automatic neutral-section passing circuit, the implementation of the device can refer to the implementation of the method, and repeated parts are not described again.
Fig. 6 is a block diagram showing the structure of a control device of the ground auto-passing neutral section circuit according to the first embodiment of the present invention. As shown in fig. 6, the control device of the ground automatic neutral-section passing circuit includes:
an alternating-current-side current acquisition unit for acquiring an alternating-current-side current;
the first judgment unit is used for judging whether the alternating current side current is less than or equal to a first preset current threshold value or not;
the first control unit is used for controlling the direct current/alternating current converter to adjust the voltage of the neutral region power supply arm to be the same as the voltage of the first power supply arm in an open-loop control mode;
and the second control unit is used for controlling the direct current/alternating current converter to enable the voltage of the neutral region power supply arm to be adjusted to be the same as the voltage of the second power supply arm from the voltage of the first power supply arm in an open-loop control mode within a preset time.
In one embodiment, the method further comprises the following steps:
a direct current side voltage obtaining unit for obtaining a direct current side voltage;
the second judging unit is used for judging whether the voltage of the direct current side is greater than a first preset voltage threshold value or not;
an overvoltage protection device closing unit for closing the overvoltage protection device.
Fig. 7 is a block diagram showing a control apparatus of a ground auto-passing neutral section circuit according to a second embodiment of the present invention. As shown in fig. 7, the control device of the ground automatic neutral-section passing circuit further comprises;
the third judging unit is used for judging whether the alternating current side current is larger than a second preset current threshold value;
the fourth judging unit is used for judging whether the direct-current side voltage is smaller than a second preset voltage threshold value or not;
and a breaking unit for breaking the first vacuum circuit breaker and the second vacuum circuit breaker.
To sum up, the control device of the ground auto-passing neutral-section circuit of the embodiment of the present invention first obtains the current at the ac side, and then determines whether the current at the ac side is less than or equal to a first preset current threshold; when the alternating current side current is smaller than or equal to a first preset current threshold value, controlling the direct current/alternating current converter to adjust the voltage of the neutral region power supply arm to be the same as the voltage of the first power supply arm in an open-loop control mode; when the alternating current side current is larger than a first preset current threshold value, the direct current/alternating current converter is controlled and controlled to enable the voltage of the neutral region power supply arm to be adjusted to be the same as the voltage of the second power supply arm from the voltage of the first power supply arm in an open-loop control mode within preset time, the feasibility of railway field application is achieved, and a train can rapidly and stably pass through a phase separation region.
Based on the same inventive concept, the embodiment of the invention also provides a control system of the ground automatic neutral-section passing circuit, and as the principle of solving the problems of the system is similar to the control method of the ground automatic neutral-section passing circuit, the implementation of the system can refer to the implementation of the method, and repeated parts are not described again.
Fig. 8 is a schematic diagram of a control system for a ground auto-passing neutral section circuit in an embodiment of the present invention. As shown in fig. 8, the control system of the ground automatic passing neutral section circuit comprises;
the ground automatic neutral-section passing circuit as described above;
a control device of the ground automatic neutral-section passing circuit;
the control device 15 of the ground automatic neutral-section passing circuit is respectively connected with the current sensor 7, the alternating current/direct current converter 6, the voltage sensor 9, the direct current/alternating current converter 14, the overvoltage protection device 8, the first vacuum circuit breaker 10 and the second vacuum circuit breaker 11 in the ground automatic neutral-section passing circuit.
The specific working process of the control system of the ground automatic neutral-section passing circuit provided by the embodiment of the invention is as follows:
1. when the train does not drive into the ground position A, the control device of the ground automatic passing neutral section circuit controls the first vacuum circuit breaker 10 and the second vacuum circuit breaker 11 to be in a closed state. If the ac side current is greater than the second preset current threshold or the dc side voltage is less than the second preset voltage threshold, the first vacuum interrupter 10 and the second vacuum interrupter 11 are opened. At this time, the control device 15 of the ground auto-neutral section passing circuit controls the ac/dc converter 6 to operate in the double closed loop control condition, so as to maintain the power factor of the ac side of the ac/dc converter 6 at 1 and maintain the voltage of the dc side of the ac/dc converter 6 stable. The control device 15 of the ground automatic neutral-section passing circuit also controls the dc/ac converter 14 to work under an open-loop control condition, at this time, the ac side current signal is less than or equal to a preset current threshold, and the control device of the ground automatic neutral-section passing circuit maintains the voltage of the neutral-section power supply arm 2 to be consistent with the voltage of the first power supply arm 1 by controlling the ac voltage output by the dc/ac converter 14.
2. The train drives into the ground position A, the traction control system on the train receives the signal of the ground position A, the traction control system on the train locks the traction inverter on the train at the moment, the traction level is reset to zero, a vacuum circuit breaker on the train is not required to be cut off, the traction inverter on the train is not required to be switched into a micro-electric working condition, a four-quadrant converter on the train is not required to be cut off, and an auxiliary system on the train can normally work and is not influenced.
3. When the train drives into the ground position B, the traction control system on the train receives a signal of the ground position B, and at the moment, the traction control system on the train judges whether the traction inverter is blocked or not, and if the traction inverter is not blocked, the vacuum circuit breaker on the train is directly cut off.
4. When the train enters the neutral zone power supply arm 2, the alternating current side current detected by the current sensor 7 is increased, and the alternating current side current is larger than the first preset current threshold, at the moment, the control device 15 of the ground automatic neutral-section passing circuit controls the direct current/alternating current converter 14 to output a second alternating current side voltage, and the second alternating current side voltage is the same as the alternating current voltage of the second power supply arm 3 after being subjected to transformation ratio by the second transformer 5. In the process, the voltage of the neutral region power supply arm 2 is adjusted by controlling the switching cycles of the 4 switching tubes of the dc/ac converter 14, so that the voltage of the neutral region power supply arm 2 is gradually transited from the same voltage as the first power supply arm 1 to the same voltage as the second power supply arm 3.
5. When the train drives into the second power supply arm 3 from the neutral region power supply arm 2, the alternating current side current detected by the current sensor 7 is reduced, the alternating current side current signal is less than or equal to the preset current threshold value, at the moment, the control device 15 of the ground automatic neutral-section passing circuit controls the direct current/alternating current converter 14 to output a second alternating current side voltage, and the second alternating current side voltage is the same as the alternating current voltage of the first power supply arm 1 after being converted by the second transformer 5. In the process, the voltage of the neutral region power supply arm 2 is adjusted by controlling the switching period of the 4 switching tubes of the dc/ac converter 14, so that the voltage of the neutral region power supply arm 2 is gradually adjusted to be the same as the voltage of the first power supply arm 1 from the same voltage as the second power supply arm 3.
6. And when the train drives into the ground position C, the traction control system on the train receives a signal of the ground position C, and the train traction control system is put into the traction inverter again at the moment to recover the normal operation condition before passing the neutral section.
In conclusion, the control system of the ground automatic neutral section passing circuit can enable a train to rapidly and stably pass through the phase separation area; the invention has simple structure, low cost and high reliability, and has feasibility of application in the railway field.
The ground automatic neutral section passing circuit, the control method, the control device and the control system thereof provided by the embodiment of the invention have the following beneficial effects:
1. the control device of the ground automatic neutral-section passing circuit can monitor that a train enters a neutral zone power supply arm, and control the direct current/alternating current converter to ensure that the voltage of the neutral zone power supply arm is gradually transited to be the same as the voltage of the second power supply arm from being the same as the voltage of the first power supply arm. Before the train enters the neutral section passing area, a traction control system on the train blocks a traction inverter on the train, the traction level is reset to zero, a vacuum circuit breaker on the train is not required to be cut off, the traction inverter on the train is not required to be switched into a micro-electric working condition, a four-quadrant converter on the train is not required to be cut off, and an auxiliary system on the train can normally work and is not influenced.
2. Compared with the prior art, the invention has the advantages of low cost and mature technology, and has feasibility of application in the railway field. The voltage of the low-voltage windings of the first transformer and the second transformer is equivalent to the alternating-current side voltage of a four-quadrant converter on a train, and the industrial application is mature.
3. Compared with the prior art, the invention can reduce the speed loss when the train passes through the phase separation zone. In the prior art, when a train drives into a phase splitting area, a traction system on the train needs to be adjusted to a micro-electric system medium-voltage maintaining working condition, and then regenerative braking is carried out to ensure that an auxiliary system is not powered off, so that the speed loss of the train can be caused. The invention can ensure that the neutral zone power supply arm meets the power requirement of the train auxiliary system without switching the traction system on the train into a micro-electric system medium-voltage maintaining working condition.
4. Compared with the prior art, the invention can improve the reliability of the train passing through the neutral section. Conventionally, a traction control system on a train receives a signal of a ground position and then switches off a vacuum circuit breaker on the train. When the first power supply arm crosses into the neutral region power supply arm, the first power supply arm and the neutral region power supply arm have different voltages, so that the pantograph generates a discharge arcing phenomenon. According to the invention, the voltage of the neutral area power supply arm is consistent with that of the first power supply arm before the train enters the neutral area power supply arm, and the voltage of the neutral area power supply arm is consistent with that of the second power supply arm after the train exits from the neutral area power supply arm, so that the pantograph cannot generate discharge arcing phenomenon when the first power supply arm spans into the neutral area power supply arm and the neutral area power supply arm spans into the second power supply arm, and the reliability of the train in the phase passing process is improved.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (11)
1. A ground auto-passing neutral section circuit connected to a first power supply arm and a neutral section power supply arm, respectively, comprising: the system comprises a first transformer, a current sensor, an alternating current/direct current converter, a voltage sensor, a direct current/alternating current converter and a second transformer;
the high-voltage winding of the first transformer is connected with the first power supply arm and used for carrying out voltage transformation ratio on the voltage of the first power supply arm to obtain a first alternating-current side voltage;
the first end of the alternating current/direct current converter is connected with a low-voltage winding of the first transformer and used for converting the first alternating-current side voltage into direct-current side voltage;
the current sensor is respectively connected with the first end of the alternating current/direct current converter and the low-voltage winding of the first transformer and is used for measuring alternating current side current;
the second end of the direct current/alternating current converter is connected with the second end of the alternating current/direct current converter and used for converting the direct current side voltage into a second alternating current side voltage;
both ends of the voltage sensor are connected with the second end of the direct current/alternating current converter and the second end of the alternating current/direct current converter, and the voltage sensor is used for measuring the direct current side voltage;
a low-voltage winding of the second transformer is connected with a first end of the direct current/alternating current converter, and a high-voltage winding of the second transformer is connected with the neutral region power supply arm and used for carrying out voltage transformation ratio on the second alternating-current side voltage to obtain the voltage of the neutral region power supply arm;
the alternating current/direct current converter and the direct current/alternating current converter are both H-bridges comprising 4 switching devices.
2. The ground auto-passing neutral section circuit of claim 1, further comprising: an overvoltage protection device;
the overvoltage protection device is connected with the voltage sensor in parallel.
3. The ground auto-passing neutral section circuit of claim 1, further comprising: a first vacuum interrupter and a second vacuum interrupter;
one end of the first vacuum circuit breaker is connected with the first power supply arm, and the other end of the first vacuum circuit breaker is connected with a high-voltage winding of the first transformer;
one end of the second vacuum circuit breaker is connected with the neutral zone power supply arm, and the other end of the first vacuum circuit breaker is connected with the high-voltage winding of the second transformer.
4. The ground auto-passing neutral section circuit of claim 3, further comprising: a first fuse and a second fuse;
one end of the first fuse is connected with the first power supply arm, and the other end of the first fuse is connected with the first vacuum circuit breaker;
one end of the second fuse is connected to the neutral zone power arm, and the other end of the second fuse is connected to the second vacuum interrupter.
5. A method for controlling a ground auto-passing neutral section circuit as claimed in any one of claims 1 to 4, comprising:
obtaining alternating current side current;
judging whether the alternating current side current is less than or equal to a first preset current threshold value or not;
when the alternating current side current is smaller than or equal to a first preset current threshold value, controlling the direct current/alternating current converter to adjust the voltage of the neutral region power supply arm to be the same as the voltage of the first power supply arm in an open-loop control mode;
when the alternating current side current is larger than a first preset current threshold value, controlling the direct current/alternating current converter to adjust the voltage of the neutral region power supply arm from the voltage of the first power supply arm to be the same as the voltage of the second power supply arm in an open-loop control mode within preset time; the preset time is the quotient of the length of the dead zone and the train speed.
6. The method of claim 5, further comprising:
acquiring direct-current side voltage;
judging whether the direct current side voltage is greater than a first preset voltage threshold value or not;
and when the direct current side voltage is greater than a first preset voltage threshold value, closing the overvoltage protection device.
7. The method for controlling the ground auto-passing neutral section circuit of claim 6, further comprising;
judging whether the alternating current side current is larger than a second preset current threshold value or not;
judging whether the direct current side voltage is smaller than a second preset voltage threshold value or not;
and when the current on the alternating current side is greater than a second preset current threshold value or the voltage on the direct current side is less than a second preset voltage threshold value, disconnecting the first vacuum circuit breaker and the second vacuum circuit breaker.
8. A control apparatus for a ground auto-passing neutral section circuit, comprising:
an alternating-current-side current acquisition unit for acquiring an alternating-current-side current;
the first judgment unit is used for judging whether the alternating current side current is less than or equal to a first preset current threshold value or not;
the first control unit is used for controlling the direct current/alternating current converter to adjust the voltage of the neutral region power supply arm to be the same as the voltage of the first power supply arm in an open-loop control mode;
and the second control unit is used for controlling the direct current/alternating current converter to enable the voltage of the neutral region power supply arm to be adjusted to be the same as the voltage of the second power supply arm from the voltage of the first power supply arm in an open-loop control mode within a preset time.
9. The apparatus for controlling a ground auto-passing neutral section circuit of claim 8, further comprising:
a direct current side voltage obtaining unit for obtaining a direct current side voltage;
the second judging unit is used for judging whether the direct-current side voltage is larger than a first preset voltage threshold value or not;
an overvoltage protection device closing unit for closing the overvoltage protection device.
10. The control apparatus of the ground auto-passing neutral section circuit of claim 9, further comprising;
the third judging unit is used for judging whether the alternating current side current is larger than a second preset current threshold value;
the fourth judging unit is used for judging whether the direct-current side voltage is smaller than a second preset voltage threshold value or not;
and a breaking unit for breaking the first vacuum circuit breaker and the second vacuum circuit breaker.
11. A control system for a ground auto-passing neutral section circuit, comprising;
the ground auto-passing neutral-section circuit of any of claims 1-4;
a control device for a ground automatic neutral-section passing circuit as claimed in any one of claims 8 to 10;
the control device of the ground automatic neutral section passing circuit is respectively connected with a current sensor, an alternating current/direct current converter, a voltage sensor, a direct current/alternating current converter, an overvoltage protection device, a first vacuum circuit breaker and a second vacuum circuit breaker in the ground automatic neutral section passing circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910012451.XA CN109733252B (en) | 2019-01-07 | 2019-01-07 | Ground automatic neutral section passing circuit and control method, control device and control system thereof |
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| CN201910012451.XA CN109733252B (en) | 2019-01-07 | 2019-01-07 | Ground automatic neutral section passing circuit and control method, control device and control system thereof |
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| CN105034856B (en) * | 2015-07-06 | 2017-11-07 | 北京交通大学 | A kind of electric neutral section of attached wires of AC electrified railway intelligence |
| CN104979827A (en) * | 2015-07-06 | 2015-10-14 | 中国铁道科学研究院 | Electrified railway power supply device and system thereof |
| CN108092522A (en) * | 2017-12-30 | 2018-05-29 | 中国船舶重工集团公司第七〇二研究所 | A kind of converter plant of electric railway ground electricity split-phase uninterruptible power supply system |
| CN108146297B (en) * | 2017-12-30 | 2020-05-12 | 中铁第四勘察设计院集团有限公司 | Ground electricity split-phase continuous power supply system for electrified railway |
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