CN112436499B - Train power supply control system, train power supply control method, controller and medium - Google Patents

Train power supply control system, train power supply control method, controller and medium Download PDF

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Publication number
CN112436499B
CN112436499B CN201910791505.7A CN201910791505A CN112436499B CN 112436499 B CN112436499 B CN 112436499B CN 201910791505 A CN201910791505 A CN 201910791505A CN 112436499 B CN112436499 B CN 112436499B
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power
converter
train
loads
power supply
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CN112436499A (en
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于涵
沈林
梁树林
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BYD Co Ltd
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BYD Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/102—Parallel operation of dc sources being switching converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/0315—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for using multiplexing techniques
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries

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

Abstract

The application discloses a train power supply control system, a train power supply control method, a controller and a medium. The system comprises serial power supply circuits arranged in at least two train carriages, each serial power supply circuit comprises a DC-DC converter connected with a track power supply system and at least one load connected with the DC-DC converter, and all loads are electrically connected. The system can ensure that all loads on the rail train can work normally, effectively ensure the conversion efficiency of each DC-DC converter, reduce the loss of the DC-DC converter, and effectively avoid the influence of the DC-DC converter with larger loss on the driving mileage and the battery capacity of the rail train.

Description

Train power supply control system, train power supply control method, controller and medium
Technical Field
The application relates to the technical field of power supply systems, in particular to a train power supply control system, a train power supply control method, a controller and a medium.
Background
The current urban rail transit comprises a train track and a rail train, wherein a track power supply system is arranged on the train track, and a train power supply control system connected with the track power supply system is arranged in the rail train so as to ensure the normal operation of the rail train. The current train power supply control system is shown in fig. 1, each carriage of the rail train is provided with a DC-DC converter and at least one load connected in series with the DC-DC converter, the loads in all carriages are electrically connected, and the storage battery is one of the loads. The train power supply control system ensures that the DC-DC converter has larger loss and lower conversion efficiency under the working condition of smaller load.
Disclosure of Invention
The embodiment of the application provides a train power supply control system, a train power supply control method, a controller and a medium, which are used for solving the problems of larger DC-DC converter loss and lower conversion efficiency of the current train power supply control system.
The train power supply control system comprises series power supply circuits arranged in at least two train carriages, wherein each series power supply circuit comprises a DC-DC converter connected with a track power supply system, at least one load connected with the DC-DC converter, all the loads are electrically connected, and a whole vehicle controller connected with all the loads and at least one DC-DC converter, the whole vehicle controller is used for collecting total power of loads corresponding to all the loads, determining target quantity corresponding to the DC-DC converter according to the total power of the loads, and controlling the DC-DC converter corresponding to the target quantity to supply power to all the loads.
A train power supply control method comprises the following steps executed by a whole train controller:
obtaining load power corresponding to all loads and determining total load power;
determining a target number corresponding to the DC-DC converter based on the total load power and the rated power corresponding to the DC-DC converter;
and controlling the DC-DC converters corresponding to the target quantity to supply power to all loads.
The whole vehicle controller comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the processor realizes the train power supply control method when executing the computer program.
A computer readable storage medium storing a computer program which when executed by a processor implements the train power supply control method described above.
According to the train power supply control system, the train power supply control method, the controller and the medium, each DC-DC converter is connected with at least one load, and all loads in at least two train carriages are electrically connected, so that each DC-DC converter can supply power to all loads on a rail train, and technical support is provided for supplying power to all loads by adopting DC-DC converters corresponding to the target number. The whole vehicle controller determines the corresponding target number of the DC-DC converters to be controlled according to the total load power by adopting the total load power corresponding to all loads, so that the DC-DC converters controlling the target number convert high voltage power into low voltage power to supply power to all loads in at least two train carriages, not only can ensure that all loads on a rail train can normally work, but also can effectively ensure the conversion efficiency of each DC-DC converter, reduce the loss of the DC-DC converter and avoid the influence of the DC-DC converter with larger loss on the driving mileage and the battery capacity of the rail train.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art train power control system;
FIG. 2 is a schematic diagram of a train power control system according to an embodiment of the present application;
FIG. 3 is a flow chart of a method for controlling power supplied to a train in accordance with an embodiment of the present application;
FIG. 4 is another flow chart of a method of controlling power to a train in accordance with an embodiment of the present application;
FIG. 5 is another flow chart of a method of controlling power to a train in accordance with an embodiment of the present application;
FIG. 6 is another flow chart of a method for controlling power supplied to a train in accordance with an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 2 shows a schematic diagram of a train power supply control system according to an embodiment of the present application. As shown in fig. 2, the train power supply control system comprises series power supply circuits arranged in at least two train carriages, each series power supply circuit comprises a DC-DC converter connected with the track power supply system, at least one load connected with the DC-DC converter, all loads are electrically connected, and a whole vehicle controller connected with all loads and the at least one DC-DC converter, wherein the whole vehicle controller is used for collecting total power of loads corresponding to all loads, determining target quantity corresponding to the DC-DC converters according to the total power of the loads, and controlling the DC-DC converter corresponding to the target quantity to supply power to all loads.
In fig. 2, the load on each railcar may include a battery disposed within the railcar. The rail power supply system is a high-voltage power supply system and can output high-voltage power; the load arranged in the train carriage is a low-voltage load, and the low-voltage load can be controlled to work according to the received low voltage power; when the whole vehicle runs, all DC-DC converters convert high-voltage power output by the rail power supply system into low-voltage power to supply power to all loads.
Specifically, each rail train comprises at least two train carriages, each train carriage comprises a series power supply circuit connected with the rail power supply system, and the high-voltage power output by the rail power supply system is converted into the low-voltage power through a DC-DC converter so as to provide the voltage power for a load connected with the DC-DC converter to enable the load in the train carriage to work. As shown in fig. 2, all load electrical connections refer to all loads in at least two railcars being electrically connected to each other such that the DC-DC converter on each railcar may supply not only at least one load in the present railcar but also at least one load in other railcars than the present railcar to enable the DC-DC converter on any railcar to supply all loads on the entire railcar.
Under the condition that the DC-DC converters on any train carriage can supply power to all loads, if all loads on the rail train are low, all the DC-DC converters work simultaneously, so that the loss is large, the conversion efficiency is low, and when the rail train adopts a power supply scheme of power supply of a storage battery and power supply of an incoming station, the DC-DC converter with large loss easily affects the driving mileage of the rail train and the battery capacity of the storage battery. To overcome this problem, in this embodiment, by connecting all loads to all DC-DC converters to collect the total load power required by all loads, the total load power can be understood as the total power that needs to be supplied by all DC-DC converters. Because each DC-DC converter corresponds to a rated power, the target number of the DC-DC converters which need to supply power to all the loads can be determined according to the total power of the loads corresponding to all the loads and the rated power corresponding to each DC-DC converter, and the target number of the DC-DC converters is the minimum number needed to supply power to all the loads. Then, the whole vehicle controller can randomly control the DC-DC converters corresponding to the target quantity to work so as to convert high-voltage power output by the rail power supply system into low-voltage power capable of enabling loads to work and supply power to all loads on the rail train, so that the normal work of all loads on the rail train is ensured. The DC-DC converter corresponding to the control target quantity is determined to work according to the total power of the loads corresponding to all the loads, high-voltage power is converted into low-voltage power, and the power supply mode is adopted for all the loads on the rail train, so that not only can all the loads on the rail train be ensured to work normally, but also the conversion efficiency of each DC-DC converter is effectively ensured, the loss of the DC-DC converter is reduced, and the influence of the DC-DC converter with larger loss on the driving mileage and the battery capacity of the rail train can be effectively avoided.
The target number can be the same as the total number of all DC-DC converters in the train power supply control system, or can be different from the total number of all DC-DC converters in the train power supply control system, and as each train carriage is provided with one DC-DC converter, the total number of all DC-DC converters is equal to the number of the whole train carriages. In this embodiment, the whole vehicle controller may adjust the target number corresponding to the DC-DC converter according to the total load power corresponding to all the loads, and control the DC-DC converter corresponding to the target number to supply power to all the loads on at least two railcars of the rail train, so as to adjust the working number of the DC-DC converter, and when the total load power is smaller, reduce the target number corresponding to the DC-DC converter, so that the DC-DC converter in the working state is in a medium load or large load state, so as to reduce the loss of the DC-DC converter, and make the conversion efficiency higher. When the target number is smaller than the number of the carriages of the whole vehicle, the DC-DC converters corresponding to the target number are controlled to supply power to all loads, so that part of DC-DC converters do not need to supply power to all loads, useless loss of the part of DC-DC converters can be reduced, and the purpose of saving electric energy loss is achieved. When the target number is equal to the number of the carriages of the whole vehicle, all the DC-DC converters are controlled to supply power to all the loads so as to ensure that all the loads can work normally.
In the train power supply control system provided by the embodiment, each DC-DC converter is electrically connected with all loads in at least two train carriages, so that each DC-DC converter can supply power to all loads on a rail train, and technical support is provided for supplying power to all loads by adopting DC-DC converters corresponding to the target quantity. The whole vehicle controller determines the corresponding target number of the DC-DC converters to be controlled according to the total load power by adopting the total load power corresponding to all loads, so that the DC-DC converters controlling the target number convert high voltage power into low voltage power to supply power to all loads in at least two train carriages, not only can ensure that all loads on a rail train can normally work, but also can effectively ensure the conversion efficiency of each DC-DC converter, reduce the loss of the DC-DC converter, and effectively avoid the influence of the DC-DC converter with larger loss on the driving mileage and the battery capacity of the rail train.
Fig. 3 shows a schematic diagram of a train power supply control system according to an embodiment of the present application. As shown in fig. 3, the train power supply control system further includes at least one relay connected to the whole vehicle controller, where each relay is used to control at least one load in two adjacent train carriages to be turned on or off, and the whole vehicle controller controls the at least one relay to be turned on or off simultaneously according to the target number and controls the DC-DC converters corresponding to the target number to supply power to all the loads.
In the train power supply control system shown in fig. 3, a relay is arranged between any two adjacent train carriages, and each relay is connected with the whole train controller and is used for controlling all loads in the two adjacent train carriages to be turned on or off under the control of the whole train controller. As one example, when at least one load in two adjacent railcars is controlled to conduct by a relay, all loads in the two adjacent railcars may be electrically connected to each other such that any one DC-DC converter in the two adjacent railcars may supply all loads in the two adjacent railcars, and to implement a DC-DC converter on either railcar may supply all loads on the entire rail train. As another example, when at least one load in two adjacent railcars is controlled to be disconnected by a relay, the DC-DC converter provided in the two adjacent railcars is caused to supply power only to at least one load connected thereto provided on the same railcar, but not to at least one load on other railcars disconnected therefrom, so as to secure the safety of the power supply process.
Because the target number is the minimum number required for ensuring the normal operation of all loads, the target number can be the same as the number of the whole car, or can be different from the number of the whole car.
As an example, when the target number is smaller than the number of the carriages of the whole vehicle, that is, when all the DC-DC converters do not need to be controlled to work, at this time, it is required to ensure that the DC-DC converter corresponding to the target number selected at random can supply power to all the loads on the rail train, so that the whole vehicle controller needs to control at least one relay to be turned on simultaneously, so as to ensure that the DC-DC converter corresponding to the target number can supply power to all the loads, and ensure the normal work of the rail train. It can be understood that when the total power of the load is smaller, the target number corresponding to the DC-DC converter is smaller than the number of the whole vehicle cabin, so that the DC-DC converter in the working state is in a medium load or large load state, the loss of the DC-DC converter is reduced, the conversion efficiency is higher, and a part of the DC-DC converters do not need to supply power to all loads, so that the useless loss of the part of the DC-DC converters can be reduced, and the purpose of saving the electric energy loss is achieved.
As another example, when the target number is equal to the number of the carriages of the whole vehicle, all DC-DC converters need to be controlled to work, at this time, the whole vehicle controller may control all relays to be turned on simultaneously, so that all DC-DC converters may supply power to all loads on the rail train, so as to ensure the normal work of the rail train.
As another example, when the target number is equal to the number of the whole train carriages, the whole train controller may also control all the relays to be turned off simultaneously, so that each DC-DC converter independently supplies power to at least one load electrically connected with the DC-DC converter in the same train carriage, thereby improving the safety of the power supply process of the train power supply control system and avoiding affecting the normal operation of other train carriages when all the DC-DC converters supply power to all the loads due to the failure of one train carriage.
In an embodiment, as shown in fig. 4, a train power supply control method is provided, and the train power supply control method is applied to the whole vehicle controller shown in fig. 2, and the train power supply control method includes the following steps:
s401: and obtaining the load power corresponding to all the loads, and determining the total load power.
In this embodiment, before the DC-DC converter is connected to the rail power supply system, so that the DC-DC converter converts the high voltage power output by the rail power supply system into low voltage power, the power-on start self-checking operation of the rail train is performed, so that a circuit path between all loads in each train carriage of the rail train and the whole vehicle controller is formed, and all loads connected to the whole vehicle controller are determined. And acquiring the load power corresponding to all loads installed in at least two train carriages of the rail train. Then, the corresponding load powers of all loads are summed to determine the total power of all loads, namely P L ＝∑P i ，P L For loading total power, P i And the load power corresponding to the ith load. The load power corresponding to the load is understood to be the rated power corresponding to the load, e.gThe load power of the battery shown in fig. 2 is 24V.
Further, before the DC-DC converter is connected to the rail power supply system to convert the high voltage power output by the rail power supply system into low voltage power, the whole vehicle controller can perform pre-charging treatment after the power-on starting self-checking operation of the rail train is completed, wherein the pre-charging treatment refers to high voltage pre-charging of components connected to the rail power supply system so as to increase the voltage of the corresponding components, so that the components are prevented from being damaged due to the high voltage power received instantly, and the purpose of protecting the components in the serial power supply circuit in the train carriage is achieved. It can be understood that after the complete power-on starting self-checking operation of the rail train, the whole vehicle controller performs pre-charging treatment on components used for connecting the rail power supply system and the DC-DC converter so as to achieve the purpose of protecting the components.
S402: the target number corresponding to the DC-DC converter is determined based on the total load power and the rated power corresponding to the DC-DC converter.
Since the total load power is the sum of the load powers of all the loads in the rail train, it is understood that the total power required for the entire rail train is the total power. For the sake of convenience of calculation, all DC-DC converters in the rail train may be set to be of the same type, so that all DC-DC converters correspond to the same rated power, which may be understood as the power at which each DC-DC converter is able to supply all loads. After determining the total load power required by the whole rail train and the rated power which can be provided by each DC-DC converter, determining the corresponding target number of the DC-DC converters which are required to be powered according to the supply-demand relation, wherein the target number can be specifically the minimum number of the DC-DC converters which can be provided by the total load power.
S403: the DC-DC converters corresponding to the target number are controlled to supply power to all loads.
Specifically, after the whole vehicle controller determines the target number of DC-DC converters required to work according to the total power of the loads and each DC-DC converter, the DC-DC converters corresponding to the target number are randomly controlled to supply power to all loads on the rail train, and as the target number is the minimum number of the DC-DC converters required to provide the total power of the loads, the whole load on the rail train can be ensured to work normally, the conversion efficiency of each DC-DC converter is effectively ensured, and the loss of the DC-DC converters is reduced.
It can be understood that the target number of DC-DC converters is the minimum number required, and the target number may be the same as the total number of all DC-DC converters in the train power supply control system, or may be different from the total number of all DC-DC converters in the train power supply control system, and since each train carriage is provided with one DC-DC converter, the total number of all DC-DC converters is equal to the number of the whole train carriages.
In this embodiment, the whole vehicle controller may adjust the target number corresponding to the DC-DC converter according to the total load power corresponding to all the loads, control the DC-DC converter corresponding to the target number to supply power to all the loads, so as to adjust the working number of the DC-DC converter, reduce the target number corresponding to the DC-DC converter when the total load power is smaller, and make the target number smaller than the number of the whole vehicle carriages, so that the DC-DC converter in the working state is in a medium load or a large load state, so as to reduce the loss of the DC-DC converter, make the conversion efficiency higher, and also make some of the DC-DC converters not need to supply power to all the loads, so that the useless loss of some of the DC-DC converter can be reduced, so as to achieve the purpose of saving electric energy loss. When the target number is equal to the number of the carriages of the whole vehicle, all the DC-DC converters are controlled to supply power to all the loads so as to ensure that all the loads can work normally.
In the train power supply control method provided by the embodiment, the total power of the loads corresponding to all the loads is adopted, and the target number corresponding to the DC-DC converters to be controlled is determined according to the total power of the loads, so that the DC-DC converters for controlling the target number convert high-voltage power output by the track power supply system into low-voltage power to supply power to all the loads in at least two train carriages, not only can the normal work of all the loads on a railway train be ensured, but also the conversion efficiency of each DC-DC converter is effectively ensured, the loss of the DC-DC converter is reduced, and the influence of the DC-DC converter with larger loss on the driving mileage and the battery capacity of the railway train can be effectively avoided.
In one embodiment, as shown in fig. 5, step S402, that is, determining the target number corresponding to the DC-DC converter based on the total load power and the rated power corresponding to the DC-DC converter, specifically includes the following steps:
s501: the control ratio is obtained based on a quotient of the total power of the load and the corresponding rated power of the DC-DC converter.
S502: and performing upward rounding operation on the control ratio to determine the corresponding target number of the DC-DC converter.
Wherein the control ratio is the quotient of the total power of the load and the rated power of the DC-DC converter, and the target quantity is the value obtained after the control ratio is rounded up, namelyM is the target quantity, P L For loading total power, P 0 Is the rated power corresponding to the DC-DC converter.
Specifically, the whole vehicle controller performs upward rounding operation on the quotient of the total power of the load and the rated power to determine the target quantity corresponding to the DC-DC converters, so that all loads on the rail train can be effectively ensured to work normally, the conversion efficiency of each DC-DC converter is effectively ensured, the loss of the DC-DC converter is reduced, and the influence of the DC-DC converter with larger loss on the driving mileage and the battery capacity of the rail train can be effectively avoided.
For example, if the ratio is controlledAt this time, it is explained that 1.5 or more DC-DC converters are required to supply power in order to ensure that all loads in the rail train can normally operate; obtained after the control ratio is rounded upIt is determined that 2 DC-DC converters are used for power supply,the load requirements of normal work of all loads can be met; when the 2 DC-DC converters are controlled to supply power to all loads, the conversion efficiency of the 2 DC-DC converters in the working state can be guaranteed, and the loss of other DC-DC converters not in the working state can be effectively reduced.
In an embodiment, when the whole rail train is designed, the total load power of all loads in the whole rail train is estimated, and a certain design margin is reserved for all DC-DC converters in the rail train, so that the reliability of a power supply control system of the rail train is ensured. If at least one load connected with the DC-DC converter only comprises a 24V storage battery, when the DC-DC converter performs voltage conversion, the voltage is required to be output to be higher than 24V, such as 28V, so as to supply power to the 24V storage battery, thereby ensuring the reliability of power supply; and when the DC-DC converter is subjected to allowance design, the allowance of the DC-DC converter can be used for supplying power to the whole vehicle controller, and a storage battery is not required to be used for supplying power to the whole vehicle controller, so that the loss of the storage battery in the rail train is further reduced, and the service life of the storage battery is prolonged.
When the whole rail train is designed, a preset redundancy proportion is needed to be set, wherein the preset redundancy proportion is specifically the proportion of the total power of the loads corresponding to all loads to the sum of the rated powers corresponding to all DC-DC converters, namelyK is a preset redundancy proportion, P L For loading total power, P 0 Is the rated power corresponding to the DC-DC converter. As the conversion efficiency of the DC-DC converter is related to the output power of the DC-DC converter, when the output power is lower, the DC-DC converter works in a hard switching state, so that the loss is higher and the conversion efficiency is lower; when the output power is lower, the DC-DC converter works in a soft switching state, so that the loss is smaller and the conversion efficiency is higher. In general design, 1/3 of rated power is set as critical point of soft and hard switch in DC-DC converter, so when output power of DC-DC converter is greater than 1/3 rated power, conversion efficiency is higher, therefore, minimum value of preset redundancy ratio is 1/3. When the whole rail train is designed, the most redundant proportion is presetThe large value can be set according to actual requirements. Experiments prove that when the preset redundancy ratio is set to be between 0.4 and 0.8, the conversion efficiency of the DC-DC converter in the rail train is higher, and the system can be ensured to have enough design margin.
Accordingly, in the case that the rail train is provided with a design margin, as shown in fig. 6, step S402, that is, based on the total load power and the rated power corresponding to the DC-DC converter, obtains a control ratio, specifically includes the following steps:
s601: and determining the redundant power corresponding to the DC-DC converter according to the product of the rated power corresponding to the DC-DC converter and the preset redundant proportion.
S602: the control ratio is obtained based on a quotient of the total power of the load and the redundant power corresponding to the DC-DC converter.
S603: and performing upward rounding operation on the control ratio to determine the corresponding target number of the DC-DC converter.
Wherein the redundant power is the product of the rated power of the DC-DC converter and the preset redundant ratio, the control ratio is the quotient of the total load power and the redundant power corresponding to the DC-DC converter, and the target number is the value obtained after the control ratio is rounded up, namelyM is the target quantity, P L For loading total power, P 0 The rated power corresponding to the DC-DC converter is K which is a preset redundancy proportion and KP 0 Is redundant power.
The target number determined in the steps S601-S603 can enable the following process of controlling the DC-DC converters corresponding to the target number to supply power to all loads based on the target number, so that not only can all loads on the rail train be effectively ensured to work normally, but also the conversion efficiency of each DC-DC converter can be effectively ensured, the loss of the DC-DC converter is reduced, the influence of the DC-DC converter with larger loss on the driving mileage and the battery capacity of the rail train can be effectively avoided, and the reliability of the normal work can be ensured due to the design margin arranged on the rail train.
For example, let the redundancy ratio k=0At 8, ifIt is illustrated that all loads can be supplied with power using 2 DC-DC converters to improve the conversion efficiency of the 2 DC-DC converters for supplying power to all loads; the load requirements of normal work of all loads can be met, and the design margin is arranged on the rail train, so that the reliability of normal work of the 2 DC-DC converters can be guaranteed, the conversion efficiency of each DC-DC converter is effectively guaranteed, and the loss of the DC-DC converter is reduced.
In an embodiment, a train power supply control method is provided and applied to a vehicle controller corresponding to a train power supply control system shown in fig. 3, where the step S403 of controlling DC-DC converters corresponding to a target number to supply power to all loads specifically includes the following steps: and if the target number is smaller than the number of the carriages of the whole vehicle, controlling all relays to be conducted simultaneously, and controlling the DC-DC converters corresponding to the target number to supply power to all loads.
In the train power supply control system shown in fig. 3, a relay is arranged between any two adjacent train carriages, and each relay is connected with the whole train controller and is used for controlling all loads in the adjacent two train carriages to be conducted or disconnected under the control of the whole train controller. As one example, when at least one load in two adjacent railcars is controlled to conduct by a relay, all loads in the two adjacent railcars may be electrically connected to each other such that both DC-DC converters in the two adjacent railcars may supply power to all loads in both railcars, and to achieve that the DC-DC converter on either railcar may supply power to all loads on the entire railcar. As another example, when at least one load in two adjacent railcars is controlled to be disconnected by a relay, the DC-DC converter provided in the two adjacent railcars is caused to supply power only to at least one load connected thereto provided on the same railcar, but not to at least one load on other railcars disconnected therefrom, so as to secure the safety of the power supply process.
In this embodiment, when the target number is smaller than the number of the carriages of the whole vehicle, that is, when all DC-DC converters do not need to be controlled to work, at this time, it is required to ensure that the DC-DC converter corresponding to the target number selected at random can supply power to all loads on the rail train, so that the whole vehicle controller needs to control at least one relay to be turned on simultaneously, so as to ensure that the DC-DC converter corresponding to the target number can supply power to all loads, and ensure normal work of the rail train. It can be understood that when the total power of the load is smaller, the target number corresponding to the DC-DC converter is smaller than the number of the whole vehicle cabin, so that the DC-DC converter in the working state is in a medium load or large load state, the loss of the DC-DC converter is reduced, the conversion efficiency is higher, and a part of the DC-DC converters do not need to supply power to all loads, so that the useless loss of the part of the DC-DC converters can be reduced, and the purpose of saving the electric energy loss is achieved.
In another embodiment, a train power supply control method is provided and applied to a vehicle controller corresponding to the train power supply control system shown in fig. 3, where the step S403 of controlling DC-DC converters corresponding to the target number to supply power to all loads specifically includes the following steps: and if the target number is equal to the number of the carriages of the whole vehicle, controlling all the relays to be simultaneously disconnected, and controlling each DC-DC converter corresponding to the target number to supply power to at least one corresponding load.
As described above, in the train power supply control system shown in fig. 3, a relay is provided between any two adjacent train cars, and each relay is connected to the whole car controller and is used for controlling all loads in the adjacent two train cars to be turned on or off under the control of the whole car controller. As an example, when the target number is equal to the number of the whole train carriages, the whole train controller controls all the relays to be simultaneously disconnected, so that each DC-DC converter independently supplies power to at least one load electrically connected with the relay, the safety of the power supply process of the train power supply control system is improved, and the influence on the normal operation of other train carriages when a fault occurs in one train carriage in the process that all the DC-DC converters supply power to all the loads is avoided.
For example, in a rail rowWhen the vehicle is provided with a design allowance, the preset redundancy proportion is set to be 0.8, and the total load power is P L The rated power corresponding to the DC-DC converter is P 0 The number N of the whole car carriages is 8, and the whole car controller calculates the target numberWhen the relay is in a closed state, all relays are controlled to be conducted simultaneously, and 1 DC-DC converter is controlled to supply power to all loads at random; in the calculated target quantity +.>When the power supply device is used, all relays are controlled to be conducted simultaneously, and 2 DC-DC converters are controlled to supply power to all loads randomly; in the calculated target quantity +.>When all relays are controlled to be simultaneously conducted, the 3 DC-DC converters are randomly controlled to supply power to all loads … … in the calculated target quantity +.>When all relays are controlled to be simultaneously turned off, 8 DC-DC converters respectively supply power to at least one load connected with the relays installed in the same train carriage. In the embodiment, the target number corresponding to the DC-DC converter is smaller than the number of the carriages of the whole vehicle, so that the DC-DC converter in a working state is in a medium-load or large-load state, the loss of the DC-DC converter is reduced, the conversion efficiency is higher, and a part of DC-DC converters do not need to supply power to all loads, thereby reducing the useless loss of the part of DC-DC converters and achieving the purpose of saving the electric energy loss. When the target number is equal to the number of the carriages of the whole vehicle, the whole vehicle controller controls all the relays to be disconnected simultaneously, so that each DC-DC converter independently supplies power to at least one load electrically connected with the DC-DC converter, and the safety of the power supply process of the train power supply control system is improved.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
In one embodiment, a vehicle controller is provided, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor executes the computer program to implement the steps of the method for controlling power supply to a vehicle in the foregoing embodiment, for example, steps S401 to S403 shown in fig. 4, or steps shown in fig. 5 to 6, and the repetition is avoided.
In an embodiment, a computer readable storage medium is provided, and a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the steps of the method for controlling power supply to a train in the above embodiment, for example, steps S401 to S403 shown in fig. 4 or steps shown in fig. 5 to 6, are implemented, and will not be repeated here.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims (9)

1. The train power supply control system is characterized by comprising series power supply circuits arranged in at least two train carriages, wherein each train carriage comprises a series power supply circuit, each series power supply circuit comprises a DC-DC converter connected with a track power supply system and at least one load connected with the DC-DC converter, each DC-DC converter is electrically connected with all loads in at least two train carriages, all loads in at least two train carriages are electrically connected with each other, and the train power supply control system further comprises a whole train controller connected with all loads and at least one DC-DC converter, the whole train controller is used for collecting total power of loads corresponding to all loads, determining the target quantity corresponding to the DC-DC converter according to the total power of the loads, and controlling the DC-DC converter corresponding to the target quantity to supply power to all the loads;
the vehicle controller is used for controlling at least one relay to be simultaneously switched on or switched off according to the target quantity, and controlling the DC-DC converters corresponding to the target quantity to supply power to all the loads;
when the target number is smaller than the number of the whole carriages, the whole vehicle controller controls all relays to be simultaneously conducted, and controls the DC-DC converters corresponding to the target number to supply power to all loads;
when the target number is equal to the number of the whole vehicle carriages, the whole vehicle controller controls all relays to be simultaneously disconnected, and controls each DC-DC converter corresponding to the target number to supply power to at least one corresponding load.
2. A train power supply control method for use in the train power supply control system of claim 1, the train power supply control method comprising the steps of:
obtaining load power corresponding to all loads and determining total load power;
determining a target number corresponding to the DC-DC converter based on the total load power and the rated power corresponding to the DC-DC converter;
and controlling the DC-DC converters corresponding to the target quantity to supply power to all loads.
3. The train power supply control method according to claim 2, wherein the determining the target number corresponding to the DC-DC converter based on the total power of the load and the rated power corresponding to the DC-DC converter includes:
based on the quotient of the total power of the load and the rated power corresponding to the DC-DC converter, obtaining a control ratio;
and performing upward rounding operation on the control ratio to determine the target number corresponding to the DC-DC converter.
4. The train power supply control method according to claim 3, wherein the obtaining a control ratio based on the total power of the load and the rated power corresponding to the DC-DC converter includes:
determining the corresponding redundant power of the DC-DC converter according to the product of the rated power corresponding to the DC-DC converter and the preset redundant proportion;
based on the quotient of the total load power and the redundant power corresponding to the DC-DC converter, obtaining a control ratio;
and performing upward rounding operation on the control ratio to determine the target number corresponding to the DC-DC converter.
5. The train power supply control method according to claim 2, wherein the controlling of the DC-DC converters corresponding to the target number to supply power to all loads includes:
and if the target number is smaller than the number of the carriages of the whole vehicle, controlling all relays to be conducted simultaneously, and controlling the DC-DC converters corresponding to the target number to supply power to all loads.
6. The train power supply control method according to claim 2, wherein the controlling of the DC-DC converters corresponding to the target number to supply power to all loads includes:
and if the target number is equal to the number of the carriages of the whole vehicle, controlling all relays to be disconnected simultaneously, and controlling each DC-DC converter corresponding to the target number to supply power to at least one corresponding load.
7. The train power supply control method according to claim 2, wherein before the load power corresponding to all the loads is obtained and the total load power is determined, the train power supply control method further comprises:
and controlling the rail train to perform power-on starting self-checking operation and pre-charging treatment.
8. A vehicle control unit comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the train power supply control method according to any one of claims 2 to 7 when executing the computer program.
9. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the train power supply control method according to any one of claims 2 to 7.
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