A method, system, medium, equipment and train for voltage stabilization control in a power outage area

Abstract

The present invention belongs to the technical field of voltage stabilization control in power-off areas. In order to solve the problem that repeated and continuous power supply interruptions of trains seriously affect the control and life of equipment of trains, a method, system, medium, equipment and train for voltage stabilization control in power-off areas are provided. The voltage stabilization control method in power-off areas includes controlling the DC / DC to be in output standby state when it is determined that the train is running in a non-power-off area; judging whether the train is passing through the power-off area based on the real-time bus voltage change, if so, controlling the DC / DC to start constant voltage output, otherwise, controlling the DC / DC to maintain output standby state; after the DC / DC starts constant voltage output, controlling the operating state of the DC / DC based on the comparison result between the bus voltage and the DC / DC output voltage; when the train stops at zero speed, controlling the DC / DC to switch to input state to charge the energy storage device. It can provide a continuous and sufficient energy source for the train in the power-off area, so that the bus voltage of the train is basically stable.

Description

Technical Field

[0001] The present invention belongs to the technical field of voltage stabilization control in a power outage area, and in particular relates to a method, system, medium, equipment and train for voltage stabilization control in a power outage area. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Some subway lines use contact rails for power supply. In this case, the contact rails cannot be laid out continuously in switch areas, resulting in power supply gaps. Furthermore, in areas with numerous switches or crossovers, short contact rails must alternate with gaps. When a train loses power while passing through a power outage, the traction inverter will undervoltage and stop. If the train is in traction at this time, it will lose traction and may even experience a train surge, making the train ride less comfortable. Furthermore, a sudden power loss can cause the auxiliary inverter to shut down, rendering the train's air conditioning system inoperable, resulting in a poor passenger experience and unwelcome comfort.

[0004] When a temporary power outage causes undervoltage protection in auxiliary traction equipment, it triggers a chain reaction, including tripping of control contacts, capacitor de-energization, and inverter shutdown. When the train re-enters the energized area, the control contactors close again to charge the capacitors. Once the voltage reaches a certain level, the inverter restarts. If the line has multiple power-off zones, this process will repeat continuously as the train passes through, seriously affecting train control and equipment life. Summary of the Invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a power-off zone voltage stabilization control method, system, medium, equipment and train, which can provide a continuous and sufficient energy source for the train in the power-off zone, so that the train bus voltage is basically stable, avoiding the impact of train power failure on vehicle control, equipment life and vehicle operation comfort.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A first aspect of the present invention provides a method for controlling voltage stabilization in a power-off region.

[0008] In one or more embodiments, a method for controlling voltage stabilization in a power-off region includes:

[0009] When it is determined that the train is running in a non-power-off zone, the DC / DC is controlled to be in an output standby state; wherein, the DC / DC is connected to the high-voltage bus of the train;

[0010] According to the real-time bus voltage changes, it is determined whether the train is passing through the power-off zone. If so, the DC / DC is controlled to start constant voltage output. Otherwise, the DC / DC is controlled to maintain output standby state.

[0011] After the DC / DC turns on constant voltage output, the operating state of the DC / DC is controlled based on the comparison result between the bus voltage and the DC / DC output voltage;

[0012] When the train stops at zero speed, the DC / DC is controlled to switch to input state to charge the energy storage device.

[0013] As an implementation method, after the DC / DC starts constant voltage output, when the bus voltage is greater than the DC / DC output voltage, it is judged that the train has re-entered the power area, and the DC / DC is controlled to stop output and enter the output standby state again.

[0014] As an implementation method, after the DC / DC turns on constant voltage output, when the bus voltage is less than or equal to the DC / DC output voltage, and the single discharge amount of the energy storage device is greater than the maximum energy consumption calculated value when the train passes through the power outage area, the DC / DC is forced to stop output and enter the output standby state.

[0015] As an implementation method, the maximum energy consumption calculated when a train passes through a power outage zone is:

[0016] The product of the maximum length of the power-off zone of the entire operating line and the maximum force of the train traction characteristic curve.

[0017] As an implementation method, the conditions for determining that a train is passing through a power outage area are:

[0018] The bus voltage is less than the voltage threshold of the energized area, and the voltage drop is greater than the voltage drop threshold within a preset time period.

[0019] As an implementation method, when a train is moving in a depot without contact rails or performing emergency traction when the line power is off, the DC / DC is controlled to start constant voltage continuous output, and the traction inverter is controlled to limit speed and power to pull the train. The energy flow is: energy storage device-DC / DC-high-voltage bus-traction inverter. At this time, the DC / DC is not subject to the output stop conditions until the train is towed to the designated position.

[0020] As an implementation method, when the entire line network is powered off and the train cannot move, the current flow is controlled to: energy storage device-DC / DC-high-voltage bus-auxiliary inverter DC / AC-medium-voltage bus to power the train's AC load.

[0021] As an implementation method, when the entire line network is powered off and the train cannot move, the current flow is controlled to: energy storage device-DC / DC-high-voltage bus-auxiliary inverter DC / DC-low-voltage bus to power the vehicle's DC load.

[0022] A second aspect of the present invention provides a voltage stabilization control system for a power outage area.

[0023] In one or more embodiments, a power outage area voltage stabilization control system includes:

[0024] A non-power-off zone judgment module is used to control the DC / DC to be in an output standby state when it is determined that the train is running in a non-power-off zone; wherein the DC / DC is connected to the high-voltage bus of the train;

[0025] The power-off zone judgment module is used to determine whether the train is passing through the power-off zone based on the real-time bus voltage changes. If so, the DC / DC is controlled to start constant voltage output; otherwise, the DC / DC is controlled to maintain output standby state;

[0026] The voltage comparison module is used to control the operation state of the DC / DC according to the comparison result between the bus voltage and the DC / DC output voltage after the DC / DC turns on the constant voltage output;

[0027] The battery charging module is used to control the DC / DC to switch to input state to charge the energy storage device when the train stops at zero speed.

[0028] As an implementation method, in the voltage comparison module, after the DC / DC starts constant voltage output, when the bus voltage is greater than the DC / DC output voltage, it is judged that the train has re-entered the power area, and the DC / DC is controlled to stop output and enter the output standby state again.

[0029] As an implementation method, in the voltage comparison module, after the DC / DC turns on the constant voltage output, when the bus voltage is less than or equal to the DC / DC output voltage, and the single discharge amount of the energy storage device is greater than the maximum energy consumption calculated value when the train passes through the power outage area, the DC / DC is forced to stop output and enter the output standby state.

[0030] As an implementation method, the maximum energy consumption calculated when a train passes through a power outage zone is:

[0031] The product of the maximum length of the power-off zone of the entire operating line and the maximum force of the train traction characteristic curve.

[0032] A third aspect of the present invention provides a computer-readable storage medium.

[0033] In one or more embodiments, a computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the power-off region voltage stabilization control method as described above.

[0034] A fourth aspect of the present invention provides a train power supply device.

[0035] In one or more embodiments, a train power supply device includes: an energy storage device, a DC / DC, an auxiliary inverter, and a traction inverter;

[0036] The DC / DC is connected to the high-voltage bus of the train; the energy storage device is connected to the DC / DC; the input end of the auxiliary inverter is connected to the high-voltage bus, and the output end is connected to the medium-voltage bus or the low-voltage bus respectively; the input end of the traction inverter is connected to the high-voltage bus or the low-voltage bus; the control process of the DC / DC is the same as the steps in the power-off area voltage stabilization control method described above.

[0037] A fifth aspect of the present invention provides a train power supply device.

[0038] In one or more embodiments, a train includes the train power supply equipment as described above.

[0039] In one or more embodiments, a train includes the power outage area voltage stabilization control system as described above.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The present invention is used to stabilize the bus voltage when the train passes through a power outage area, avoiding the loss of train traction caused by a short power outage, so that the train impulse is alleviated, the operation is smooth, and the comfort is improved; at the same time, it can reduce the number of actions of the internal control contactor of the traction auxiliary equipment and the charging and discharging frequency of the supporting capacitor, and weaken the impact of the power outage area on the internal inverter module, thereby reducing the failure rate of each component, increasing the service life of the equipment, and saving maintenance costs.

[0042] (2) The voltage stabilizing control system of the present invention has the functions of moving cars within the depot and emergency traction when the line network is out of power, and can provide a stable and continuous energy source for the train; and the voltage stabilizing control system of the present invention also has the functions of "battery + emergency ventilation inverter", which can provide an energy source for the train's emergency loads (emergency ventilation, emergency lighting, etc.), that is, the emergency ventilation inverter can be cancelled.

[0043] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0045] Figure 1 Schematic diagram of the energy storage structure of an embodiment of the present invention;

[0046] Figure 2 4 is a flow chart of a method for controlling voltage stabilization in a power-off area according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0048] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0049] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0050] Example 1

[0051] according to Figure 2 This embodiment provides a method for controlling voltage stabilization in a power-off area, including:

[0052] Step 1: When it is determined that the train is running in a non-power-off area, the DC / DC is controlled to be in an output standby state; wherein the DC / DC is connected to the high-voltage bus of the train.

[0053] Step 2: Based on the real-time bus voltage changes, determine whether the train is passing through the power-off zone. If so, control the DC / DC to start constant voltage output; otherwise, control the DC / DC to maintain output standby state.

[0054] Among them, the conditions for determining that the train is passing through the power outage area are:

[0055] The bus voltage is less than the voltage threshold of the energized area, and the voltage drop is greater than the voltage drop threshold within a preset time period.

[0056] For example, when the condition "bus voltage <1450V, and voltage drop >100V within 50ms" is met, it is determined that the train is passing through a power-off zone, and the DC / DC turns on a constant voltage 1350V output to provide a stable high-voltage power supply for the train load.

[0057] Step 3: After the DC / DC turns on constant voltage output, the operating state of the DC / DC is controlled based on the comparison result between the bus voltage and the DC / DC output voltage.

[0058] In the specific implementation process of step 3, after the DC / DC starts constant voltage output, when the bus voltage is greater than the DC / DC output voltage, it is judged that the train has re-entered the power area, and the DC / DC is controlled to stop output and enter the output standby state again.

[0059] For example:

[0060] When the DC / DC starts outputting and the specific condition of "bus voltage > 1350V" is met, it is judged that the train has re-entered the electrified area, and the DC / DC will stop outputting and enter the output standby state again.

[0061] After the DC / DC turns on constant voltage output, when the bus voltage is less than or equal to the DC / DC output voltage, and the single discharge amount of the energy storage device is greater than the maximum energy consumption calculated value when the train passes through the power outage area, the DC / DC is forced to stop output and enter the output standby state.

[0062] Among them, the maximum energy consumption calculated when the train passes through the power outage area is:

[0063] The product of the maximum length of the power-off zone of the entire operating line and the maximum force of the train traction characteristic curve.

[0064] If the entire line network suddenly loses power and causes the DC / DC to start constant voltage output, before the line network power supply is restored, or after the power supply is restored, the bus voltage continues to be low (for example, less than 1350V), because the conditions for DC / DC to stop output are not met, the DC / DC will continue to output at a constant voltage, causing the energy storage device to continue to discharge until it is seriously depleted. Therefore, a specific condition must exist to force the DC / DC to stop output to avoid unlimited discharge, otherwise it will affect the train's "emergency traction rescue when the entire line network is out of power" and "powering the train's emergency load in the absence of high voltage" functions. The specific condition is set as: "The single discharge amount of the energy storage device Q out >The maximum energy consumption calculated value Q when the train passes through the power outage area max ”.

[0065] The maximum energy consumption calculation method is: the maximum length L of the power outage area of ​​the entire operating line max , the maximum force F of the train traction characteristic curve max The product of the two is the maximum energy consumption value when the train passes through the power-off zone, that is, Q max =F max *L max .

[0066] Step 4: When the train stops at zero speed, control the DC / DC to switch to input state to charge the energy storage device.

[0067] When the train comes to a complete stop at zero speed, the DC / DC will switch to input mode to charge the energy storage device, thereby promptly offsetting the energy storage device's consumption and meeting the train's subsequent operating requirements. The reason the DC / DC is only allowed to start inputting and charging power after the train reaches zero speed is that since the DC / DC requires a certain conversion time to switch from "input state" to "output state" (charging to discharging), if the train passes through a power outage while the DC / DC is in input mode, it will not be able to immediately switch to output mode, thus failing to stabilize the bus voltage in a timely manner. It may even cause undervoltage protection of the traction auxiliary equipment, and the adverse effects of the power outage on the train will continue to exist. Therefore, to avoid this situation, the energy storage device is only charged when the train is at zero speed.

[0068] In some other embodiments, when a train is moving in a depot without contact rails or the train performs the emergency traction function when the line power is off, the DC / DC is controlled to start constant voltage continuous output, and the traction inverter is controlled to limit the speed and power of the traction train. The energy flow is: energy storage device-DC / DC-high-voltage bus-traction inverter. At this time, the DC / DC is not subject to the output stop condition until the train is towed to the designated position.

[0069] In some embodiments, when the entire line network is powered off and the train cannot move, the current flow is controlled as follows: energy storage device-DC / DC-high voltage bus-auxiliary inverter DC / AC-medium voltage bus to power the train's AC loads, such as emergency ventilation.

[0070] In some embodiments, when the entire line loses power and the train cannot move, the current flow is controlled as follows: energy storage device - DC / DC - high-voltage bus - auxiliary DC / DC inverter - low-voltage bus to power the train's DC loads, such as emergency lighting. In this case, the "auxiliary inverter + energy storage device" system completely replaces the "battery + emergency ventilation inverter" system to provide power to the train's emergency loads.

[0071] Example 2

[0072] This embodiment provides a power outage area voltage stabilization control system, which includes:

[0073] A non-power-off zone judgment module is used to control the DC / DC to be in an output standby state when it is determined that the train is running in a non-power-off zone; wherein the DC / DC is connected to the high-voltage bus of the train;

[0074] The power-off zone judgment module is used to determine whether the train is passing through the power-off zone based on the real-time bus voltage changes. If so, the DC / DC is controlled to start constant voltage output; otherwise, the DC / DC is controlled to maintain output standby state;

[0075] The voltage comparison module is used to control the operation state of the DC / DC according to the comparison result between the bus voltage and the DC / DC output voltage after the DC / DC turns on the constant voltage output;

[0076] The battery charging module is used to control the DC / DC to switch to input state to charge the energy storage device when the train stops at zero speed.

[0077] Among them, in the voltage comparison module, after the DC / DC starts constant voltage output, when the bus voltage is greater than the DC / DC output voltage, it is judged that the train has re-entered the power area, and the DC / DC is controlled to stop output and enter the output standby state again.

[0078] In the voltage comparison module, after the DC / DC turns on constant voltage output, when the bus voltage is less than or equal to the DC / DC output voltage, and the single discharge amount of the energy storage device is greater than the maximum energy consumption calculated value when the train passes through the power outage area, the DC / DC is forced to stop output and enter the output standby state.

[0079] The maximum energy consumption calculated when the train passes through the power outage area is:

[0080] The product of the maximum length of the power-off zone of the entire operating line and the maximum force of the train traction characteristic curve.

[0081] It should be noted here that the various modules in this embodiment correspond one-to-one to the various steps in Example 1, and the specific implementation processes are the same, which will not be repeated here.

[0082] Example 3

[0083] This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the steps in the power-off region voltage stabilization control method described above are implemented.

[0084] The specific steps of the voltage stabilization control method in the power-off area are as described in the first embodiment and will not be repeated here.

[0085] Example 4

[0086] In this embodiment, the train is equipped with one or more energy storage devices (or other types of energy storage devices), which are then connected to the train's high-voltage bus through a bidirectional DC / DC. This allows for both forward output (discharge) to provide high-voltage power to the train load, and reverse input to charge the energy storage device, thereby replenishing energy consumption during train operation.

[0087] according to Figure 1 ,This embodiment provides a train power supply device, which includes: an energy storage device, a DC / DC, an auxiliary inverter and a traction inverter;

[0088] The DC / DC is connected to the high-voltage bus of the train; the energy storage device is connected to the DC / DC; the input end of the auxiliary inverter is connected to the high-voltage bus, and the output end is connected to the medium-voltage bus or the low-voltage bus respectively; the input end of the traction inverter is connected to the high-voltage bus or the low-voltage bus; the control process of the DC / DC is the same as the steps in the power-off area voltage stabilization control method described above.

[0089] The specific steps of the voltage stabilization control method in the power-off area are as described in the first embodiment and will not be repeated here.

[0090] Example 5

[0091] This embodiment provides a train, which includes the train power supply equipment as described in the fourth embodiment above.

[0092] It should be noted here that, except for the train power supply equipment, other structures of the train can be implemented using existing structures or equipment and will not be described in detail here.

[0093] Example 6

[0094] This embodiment provides a train, which includes the power outage area voltage stabilization control system as described in the first embodiment above.

[0095] It should be noted here that, except for the power outage area voltage stabilization control system, other structures of the train can be implemented using existing structures or equipment and will not be described in detail here.

[0096] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for controlling voltage stabilization in a power-off area, characterized in that: include: When it is determined that the train is running in a non-power-off zone, the DC / DC is controlled to be in an output standby state; wherein, the DC / DC is connected to the high-voltage bus of the train; According to the real-time bus voltage changes, it is determined whether the train is passing through the power-off zone. If so, the DC / DC is controlled to start constant voltage output. Otherwise, the DC / DC is controlled to maintain output standby state. After the DC / DC turns on constant voltage output, the operating state of the DC / DC is controlled based on the comparison result between the bus voltage and the DC / DC output voltage; When a train is moving within a depot without contact rails or performing emergency traction during a power outage, the DC / DC is controlled to start constant voltage output, and the traction inverter is controlled to limit speed and power to pull the train. The energy flow is: energy storage device - DC / DC - high-voltage bus - traction inverter. At this time, the DC / DC is not subject to the output stop conditions until the train is towed to the designated location. When the train stops at zero speed, the DC / DC is controlled to switch to input state to charge the energy storage device.

2. The method for controlling voltage stabilization in a power-off area according to claim 1, wherein: After the DC / DC turns on constant voltage output, when the bus voltage is greater than the DC / DC output voltage, it is judged that the train has re-entered the power area, and the DC / DC is controlled to stop output and enter the output standby state again.

3. The method for controlling voltage stabilization in a power-off area according to claim 1 or 2, wherein: After the DC / DC turns on constant voltage output, when the bus voltage is less than or equal to the DC / DC output voltage, and the single discharge amount of the energy storage device is greater than the maximum energy consumption calculated value when the train passes through the power outage area, the DC / DC is forced to stop output and enter the output standby state.

4. The method for controlling voltage stabilization in a power-off area according to claim 3, wherein: The maximum energy consumption calculated when the train passes through the power outage area is: The product of the maximum length of the power-off zone of the entire operating line and the maximum force of the train traction characteristic curve.

5. The method for controlling voltage stabilization in a power-off area according to claim 1, wherein: The conditions for determining that a train is passing through a power outage area are: The bus voltage is less than the voltage threshold of the energized area, and the voltage drop is greater than the voltage drop threshold within a preset time period.

6. The method for controlling voltage stabilization in a power-off area according to claim 1, wherein: When the entire line network loses power and the train cannot move, the control current flow is: energy storage device-DC / DC-high-voltage bus-auxiliary inverter DC / AC-medium-voltage bus to power the train's AC loads.

7. The method for controlling voltage stabilization in a power-off area according to claim 1, wherein: When the entire line network loses power and the train cannot move, the control current flow is: energy storage device-DC / DC-high-voltage bus-auxiliary inverter DC / DC-low-voltage bus to power the vehicle's DC load.

8. A voltage stabilization control system for a power outage area, characterized in that: include: A non-power-off zone judgment module is used to control the DC / DC to be in an output standby state when it is determined that the train is running in a non-power-off zone; wherein the DC / DC is connected to the high-voltage bus of the train; The power-off zone judgment module is used to determine whether the train is passing through the power-off zone based on the real-time bus voltage changes. If so, the DC / DC is controlled to start constant voltage output; otherwise, the DC / DC is controlled to maintain output standby state; The voltage comparison module is used to control the operation state of the DC / DC according to the comparison result between the bus voltage and the DC / DC output voltage after the DC / DC turns on the constant voltage output; When a train is moving within a depot without contact rails or performing emergency traction during a power outage, the DC / DC is controlled to start constant voltage output, and the traction inverter is controlled to limit speed and power to pull the train. The energy flow is: energy storage device - DC / DC - high-voltage bus - traction inverter. At this time, the DC / DC is not subject to the output stop conditions until the train is towed to the designated location. The battery charging module is used to control the DC / DC to switch to input state to charge the energy storage device when the train stops at zero speed.

9. The power outage area voltage stabilization control system according to claim 8, characterized in that: In the voltage comparison module, after the DC / DC starts constant voltage output, when the bus voltage is greater than the DC / DC output voltage, it is judged that the train has re-entered the power area, and the DC / DC is controlled to stop output and enter the output standby state again.

10. The power outage area voltage stabilization control system according to claim 8 or 9, characterized in that: In the voltage comparison module, after the DC / DC turns on constant voltage output, when the bus voltage is less than or equal to the DC / DC output voltage, and the single discharge amount of the energy storage device is greater than the maximum energy consumption calculated value when the train passes through the power outage area, the DC / DC is forced to stop output and enter the output standby state.

11. The power outage area voltage stabilization control system according to claim 10, characterized in that: The maximum energy consumption calculated when the train passes through the power outage area is: The product of the maximum length of the power-off zone of the entire operating line and the maximum force of the train traction characteristic curve.

12. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the program is executed by a processor, the steps in the power-off area voltage stabilization control method according to any one of claims 1 to 7 are implemented.

13. A train power supply device, characterized in that: include: Energy storage devices, DC / DC, auxiliary inverters and traction inverters; The DC / DC is connected to the high-voltage bus of the train; The energy storage device is connected to the DC / DC; the input end of the auxiliary inverter is connected to the high-voltage bus, and the output end is connected to the medium-voltage bus or the low-voltage bus respectively; the input end of the traction inverter is connected to the high-voltage bus or the low-voltage bus; the control process of the DC / DC is the steps in the power-off area voltage stabilization control method described in any one of claims 1-7.

14. A train, characterized in that: comprising the train power supply equipment as claimed in claim 13; Or the train includes the power outage area voltage stabilization control system according to any one of claims 8-11.

Images