A control circuit and control method for continuous power supply of an electric locomotive through phase crossover

Abstract

The application provides a control circuit and a control method for continuous power supply of an electric locomotive over a neutral section, and belongs to the technical field of traction power supply. The application solves the hidden danger problem of power-off operation of an electric locomotive over a neutral section in the prior art. The control circuit comprises a first power supply traction network, a second power supply traction network, and a traction network neutral section between the two networks. A primary side of a first transformer is connected in series between the first power supply traction network and the traction network neutral section. A primary side of a second transformer is connected in series between the second power supply traction network and the traction network neutral section. A secondary side of the first transformer is connected with a first switch, and a secondary side of the second transformer is connected with a second switch. The application enables the traction network to continuously supply power to the electric locomotive in the neutral section, thereby realizing the effect of continuous power supply of the electric locomotive over the neutral section and eliminating the hidden danger of stopping the locomotive in the neutral section.

Description

Technical Field

[0001] This invention belongs to the field of traction power supply technology and is applied to the power supply and distribution process of electric locomotives in railway transportation systems. Specifically, it is a control circuit and control method for continuous power supply of electric locomotives through phase separation. Background Technology

[0002] In railway transportation systems, the traction network that supplies power to electric locomotives is not powered by a single power supply station; instead, multiple power supply stations are responsible for multiple different areas. Since the phase of the current between each power supply station is not necessarily the same, there is a section of the "grid" without electricity between two adjacent power supply stations responsible for different areas. This section is called the neutral section of the traction network, and the process of an electric locomotive passing through this section is called passing through the phase.

[0003] In existing technology, when electric locomotives pass through a phase break, they operate with the power off, and the entire train relies on inertia to glide through the phase break area. Therefore, in actual transportation, if the electric locomotive stops in the phase break area due to unexpected conditions or insufficient inertia, it will not be able to obtain power supply and will be unable to operate, resulting in a great safety hazard. Summary of the Invention

[0004] The purpose of this invention is to enable the traction network to continuously supply power to electric locomotives even in the phase-splitting zone, thereby achieving the effect of electric locomotives passing through the phase-splitting zone without interruption of power and eliminating the hidden danger of locomotives stopping in the phase-splitting zone.

[0005] The present invention employs the following technical solutions to achieve its objective:

[0006] A control circuit for continuous power supply to an electric locomotive via phase separation includes a first power supply traction network, a second power supply traction network, and a traction network neutral section located between the two; a primary side of a first transformer is connected in series between the first power supply traction network and the traction network neutral section; a primary side of a second transformer is connected in series between the second power supply traction network and the traction network neutral section; a first switching switch is connected to the secondary side of the first transformer, and a second switching switch is connected to the secondary side of the second transformer.

[0007] Specifically, the primary side of the first transformer includes a first lead and a second lead. The first lead is connected to the first power supply traction network through a first switch cabinet, and the second lead is connected to the neutral section of the traction network through a second switch cabinet.

[0008] Specifically, the primary side of the second transformer includes a third lead and a fourth lead. The third lead is connected to the second power supply traction network through a third switch cabinet, and the fourth lead is connected to the neutral section of the traction network through a fourth switch cabinet.

[0009] Preferably, the first switchgear, the second switchgear, the third switchgear and the fourth switchgear are all used to control the opening and closing functions of the corresponding traction network lines and transformer lines and to realize electrical protection.

[0010] Furthermore, the first switching switch is used to control the on / off state of power supply from the first power supply traction network to the neutral section of the traction network through the first transformer; the second switching switch is used to control the on / off state of power supply from the second power supply traction network to the neutral section of the traction network through the second transformer.

[0011] Optionally, both the first and second switching switches can be of the following types: static switches composed of silicon controlled rectifiers or turn-off thyristors (GTOs), contactors with fast closing and opening characteristics, and circuit breakers.

[0012] This invention also provides a control method for electric locomotives traveling through phase-separated continuous power supply. When the electric locomotive's direction of travel is from the first power supply traction network to the second power supply traction network, the control method includes the following steps:

[0013] S11. When the electric locomotive is located in the first power supply traction network area, the first switching switch is closed to enable the power supply state from the first power supply traction network to the neutral section of the traction network. At this time, the neutral section of the traction network receives the same first phase power supply as the first power supply traction network.

[0014] S12. When the electric locomotive enters the neutral section of the traction network, it still uses the first phase electrical energy of the neutral section of the traction network as its power supply. At this time, the first switching switch is disconnected, and the power supply from the first power supply traction network to the neutral section of the traction network is interrupted. At the same time, the second switching switch is closed, and the power supply from the second power supply traction network to the neutral section of the traction network is turned on. At this time, the neutral section of the traction network receives the same second phase electrical energy supply as the second power supply traction network.

[0015] S13. At this time, the electric locomotive uses the second phase electrical energy of the neutral section of the traction network as its power supply until it enters the second power supply traction network area and proceeds normally.

[0016] Optionally, when the electric locomotive is traveling from the second power supply traction network to the first power supply traction network, the control method includes the following steps:

[0017] S21. When the electric locomotive is located in the area of ​​the second power supply traction network, the second switching switch is closed to enable the power supply state of the second power supply traction network to the neutral section of the traction network. At this time, the neutral section of the traction network receives the same second-phase power supply as the second power supply traction network.

[0018] S22. When the electric locomotive enters the neutral section of the traction network, it still uses the second phase electrical energy of the neutral section of the traction network as its power supply. At this time, the second switching switch is disconnected, and the power supply from the second power supply traction network to the neutral section of the traction network is interrupted. At the same time, the first switching switch is closed, and the power supply from the first power supply traction network to the neutral section of the traction network is turned on. At this time, the neutral section of the traction network receives the same first phase electrical energy supply as the first power supply traction network.

[0019] S23. At this time, the electric locomotive uses the first phase electrical energy of the neutral section of the traction network as its power supply until it enters the first power supply traction network area and proceeds normally.

[0020] Preferably, before steps S11 and S21, the method further includes:

[0021] S01. Close the first switchgear and the second switchgear, so that the primary side of the first transformer is connected in series between the first power supply traction network and the neutral section of the traction network;

[0022] S02. Close the third and fourth switchgear to connect the primary side of the second transformer in series between the second power supply traction network and the neutral section of the traction network.

[0023] Furthermore, when the lines of the first power supply traction network, the neutral section of the traction network, and the second power supply traction network are idle and no electric locomotives are passing through the phase, both the first and second switching switches are open; when an electric locomotive passes through the phase, only one of the first and second switching switches can be closed at any given time.

[0024] In summary, due to the adoption of this technical solution, the beneficial effects of this invention are as follows:

[0025] This invention involves inserting series transformers between the power supply traction network and the neutral section of the traction network in different regions. By alternately closing and opening the secondary side of the series transformers, the power supply conversion of different phases of electrical energy in the neutral section of the traction network is achieved, thereby realizing the continuity of power supply. When this invention is applied to the automatic phase crossing of electric locomotives, it can ensure that the electric locomotives receive continuous power supply during phase crossing, thereby reducing the power outage area in the traction network, avoiding the entire train from stalling, and thus improving transport capacity. It also reduces the faults and safety hazards of electric locomotives during phase crossing. Attached Figure Description

[0026] Figure 1 This is a schematic block diagram of the control circuit structure of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0029] Example 1

[0030] like Figure 1 As shown, a control circuit for continuous power supply of electric locomotives through phase separation includes a first power supply traction network, a second power supply traction network, and a traction network neutral section located between the two; the first power supply traction network has a first phase of electrical energy, the second power supply traction network has a second phase of electrical energy, and the traction network neutral section is an unpowered "grid" in the traction network, that is, the phase separation area.

[0031] The primary side of the first transformer is connected in series between the first power supply traction network and the neutral section of the traction network; the primary side of the second transformer is connected in series between the second power supply traction network and the neutral section of the traction network; a first switching switch is connected to the secondary side of the first transformer, and a second switching switch is connected to the secondary side of the second transformer.

[0032] In this embodiment, the primary side of the first transformer includes a first lead and a second lead. The first lead is connected to the first power supply traction network through a first switch cabinet, and the second lead is connected to the neutral section of the traction network through a second switch cabinet. The primary side of the second transformer includes a third lead and a fourth lead. The third lead is connected to the second power supply traction network through a third switch cabinet, and the fourth lead is connected to the neutral section of the traction network through a fourth switch cabinet.

[0033] The first, second, third, and fourth switchgear are all used to control the switching functions of the corresponding traction network lines and transformer lines and to achieve electrical protection. According to the actual situation of the traction lines and the power indicators, the switchgear in this embodiment can be partially or completely eliminated, so that the transformer and the traction network are directly connected.

[0034] In this embodiment, the first switching switch is used to control the on and off states of power supply from the first power supply traction network to the neutral section of the traction network through the first transformer; the second switching switch is used to control the on and off states of power supply from the second power supply traction network to the neutral section of the traction network through the second transformer; the types of the first switching switch and the second switching switch both include: static switches composed of thyristors or turn-off thyristors (GTOs), contactors with fast closing and opening characteristics, and circuit breakers.

[0035] Example 2

[0036] Based on Example 1, this example uses the control circuit therein to propose a control method for continuous power supply of electric locomotives across phase breaks. The control scenarios include the uplink and downlink processes of the line, as detailed below:

[0037] When the electric locomotive is traveling from the first power supply traction network to the second power supply traction network, the control method includes the following steps:

[0038] S11. When the electric locomotive is located in the first power supply traction network area, the first switching switch is closed to enable the power supply state from the first power supply traction network to the neutral section of the traction network. At this time, the neutral section of the traction network receives the same first phase power supply as the first power supply traction network.

[0039] S12. When the electric locomotive enters the neutral section of the traction network, it still uses the first phase electrical energy of the neutral section of the traction network as its power supply. At this time, the first switching switch is disconnected, and the power supply from the first power supply traction network to the neutral section of the traction network is interrupted. At the same time, the second switching switch is closed, and the power supply from the second power supply traction network to the neutral section of the traction network is turned on. At this time, the neutral section of the traction network receives the same second phase electrical energy supply as the second power supply traction network.

[0040] S13. At this time, the electric locomotive uses the second phase electrical energy of the neutral section of the traction network as its power supply until it enters the second power supply traction network area and proceeds normally.

[0041] When the electric locomotive is traveling from the second power supply traction network to the first power supply traction network, the control method includes the following steps:

[0042] S21. When the electric locomotive is located in the area of ​​the second power supply traction network, the second switching switch is closed to enable the power supply state of the second power supply traction network to the neutral section of the traction network. At this time, the neutral section of the traction network receives the same second-phase power supply as the second power supply traction network.

[0043] S22. When the electric locomotive enters the neutral section of the traction network, it still uses the second phase electrical energy of the neutral section of the traction network as its power supply. At this time, the second switching switch is disconnected, and the power supply from the second power supply traction network to the neutral section of the traction network is interrupted. At the same time, the first switching switch is closed, and the power supply from the first power supply traction network to the neutral section of the traction network is turned on. At this time, the neutral section of the traction network receives the same first phase electrical energy supply as the first power supply traction network.

[0044] S23. At this time, the electric locomotive uses the first phase electrical energy of the neutral section of the traction network as its power supply until it enters the first power supply traction network area and proceeds normally.

[0045] In this embodiment, before steps S11 and S21, depending on the actual setup of the switchgear, the following may also be included:

[0046] S01. Close the first switchgear and the second switchgear, so that the primary side of the first transformer is connected in series between the first power supply traction network and the neutral section of the traction network;

[0047] S02. Close the third and fourth switchgear to connect the primary side of the second transformer in series between the second power supply traction network and the neutral section of the traction network.

[0048] In this embodiment, when the lines of the first power supply traction network, the neutral section of the traction network, and the second power supply traction network are idle and no electric locomotives are passing through the phase, both the first switching switch and the second switching switch are open; when an electric locomotive passes through the phase, only one of the first switching switch and the second switching switch can be closed at the same time; that is, the first switching switch and the second switching switch cannot be in the closed state at the same time. In order to prevent accidental control and operation from causing simultaneous closure and making the neutral section of the traction network simultaneously connected by power supply traction networks of different phases, corresponding relay protection devices and operating logic can be set accordingly.

Claims

1. A control circuit for continuous power supply to an electric locomotive across phases, comprising a first power supply traction network, a second power supply traction network, and a neutral section of the traction network located between the two, characterized in that: The primary side of a first transformer is connected in series between the first power supply traction network and the neutral section of the traction network; the primary side of a second transformer is connected in series between the second power supply traction network and the neutral section of the traction network; a first switching switch is connected to the secondary side of the first transformer, and a second switching switch is connected to the secondary side of the second transformer. The primary side of the first transformer includes a first lead and a second lead. The first lead is connected to the first power supply traction network through a first switch cabinet, and the second lead is connected to the neutral section of the traction network through a second switch cabinet. The primary side of the second transformer includes a third lead and a fourth lead. The third lead is connected to the second power supply traction network through a third switch cabinet, and the fourth lead is connected to the neutral section of the traction network through a fourth switch cabinet.

2. The control circuit for continuous power supply to an electric locomotive across phases according to claim 1, characterized in that: The first switchgear, the second switchgear, the third switchgear, and the fourth switchgear are all used to control the opening and closing functions of the corresponding traction network lines and transformer lines and to achieve electrical protection.

3. The control circuit for continuous power supply to an electric locomotive across phases according to claim 1, characterized in that: The first switching switch is used to control the on / off state of power supply from the first power supply traction network to the neutral section of the traction network through the first transformer; the second switching switch is used to control the on / off state of power supply from the second power supply traction network to the neutral section of the traction network through the second transformer.

4. The control circuit for continuous power supply to an electric locomotive across phases according to claim 3, characterized in that: The first and second switching switches are both of the following types: static switches composed of silicon controlled rectifiers or turn-off thyristors (GTOs), contactors and circuit breakers with fast closing and opening characteristics.

5. A control method for continuous power supply to an electric locomotive across phases according to the control circuit of claim 1, characterized in that: When the electric locomotive is traveling from the first power supply traction network to the second power supply traction network, the control method includes the following steps: S11. When the electric locomotive is located in the first power supply traction network area, the first switching switch is closed to enable the power supply state from the first power supply traction network to the neutral section of the traction network. At this time, the neutral section of the traction network receives the same first phase power supply as the first power supply traction network. S12. When the electric locomotive enters the neutral section of the traction network, it still uses the first phase electrical energy of the neutral section of the traction network as its power supply. At this time, the first switching switch is disconnected, and the power supply from the first power supply traction network to the neutral section of the traction network is interrupted. At the same time, the second switching switch is closed, and the power supply from the second power supply traction network to the neutral section of the traction network is turned on. At this time, the neutral section of the traction network receives the same second phase electrical energy supply as the second power supply traction network. S13. At this time, the electric locomotive uses the second phase electrical energy of the neutral section of the traction network as its power supply until it enters the second power supply traction network area and proceeds normally.

6. The control method for continuous power supply to electric locomotives across phases according to claim 5, characterized in that: When the electric locomotive is traveling from the second power supply traction network to the first power supply traction network, the control method includes the following steps: S21. When the electric locomotive is located in the area of ​​the second power supply traction network, the second switching switch is closed to enable the power supply state of the second power supply traction network to the neutral section of the traction network. At this time, the neutral section of the traction network receives the same second-phase power supply as the second power supply traction network. S22. When the electric locomotive enters the neutral section of the traction network, it still uses the second phase electrical energy of the neutral section of the traction network as its power supply. At this time, the second switching switch is disconnected, and the power supply from the second power supply traction network to the neutral section of the traction network is interrupted. At the same time, the first switching switch is closed, and the power supply from the first power supply traction network to the neutral section of the traction network is turned on. At this time, the neutral section of the traction network receives the same first phase electrical energy supply as the first power supply traction network. S23. At this time, the electric locomotive uses the first phase electrical energy of the neutral section of the traction network as its power supply until it enters the first power supply traction network area and proceeds normally.

7. The control method for continuous power supply to an electric locomotive across phases according to claim 6, characterized in that, Before steps S11 and S21, the method further includes: S01. Close the first switchgear and the second switchgear, so that the primary side of the first transformer is connected in series between the first power supply traction network and the neutral section of the traction network; S02. Close the third and fourth switchgear to connect the primary side of the second transformer in series between the second power supply traction network and the neutral section of the traction network.

8. The control method for continuous power supply to electric locomotives across phases according to claim 6, characterized in that: When the lines of the first power supply traction network, the neutral section of the traction network, and the second power supply traction network are idle and no electric locomotives are passing through the phase, both the first and second switching switches are open; when an electric locomotive passes through the phase, only one of the first and second switching switches can be closed at the same time.

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