CN115817211A - Rail vehicle and its hydrogen energy hybrid traction control circuit and control method - Google Patents

Abstract

The invention discloses a rail vehicle and its hydrogen energy hybrid traction control circuit and control method. The control circuit includes a hydrogen fuel cell module, a DC/DC converter, a lithium battery module, a first management unit, and a second management unit and the DC/DC converter control unit; the DC/DC converter control unit is respectively connected with the DC/DC converter, the first management unit and the second management unit; the DC/DC converter control unit according to the vehicle status signal And the lithium battery module SOC controls the working state of the DC/DC converter and the output power of the hydrogen fuel cell module, so as to realize the power supply of the hydrogen fuel cell module and/or the lithium battery module to the traction converter. The invention can realize energy transmission between the hydrogen fuel cell module, the lithium battery module and the traction converter, so that the hydrogen fuel cell module and the lithium battery module can exert their respective performance advantages, give play to the advantages of the traction performance of the locomotive, and absorb energy while the locomotive is running. Reuse regenerative braking energy to achieve the purpose of energy saving and environmental protection.

Description

Rail vehicle and its hydrogen energy hybrid traction control circuit and control method

technical field

The invention belongs to the technical field of rail vehicle control, and in particular relates to a rail vehicle and its hydrogen energy hybrid traction control circuit and control method.

Background technique

At present, rail transit vehicles using pantographs/current collectors need to set up power grids on their lines, and the exhaust emissions generated by rail transit vehicles using internal combustion power may be dangerous when running in tunnels, while hydrogen energy hybrid traction The method can greatly improve the operating efficiency of the locomotive, reduce the exhaust gas emission of the locomotive in the tunnel and even the entire line section, and at the same time free the locomotive from the energy supply limit of the grid.

Hydrogen fuel cells have good energy density, but the power loading is slow and the power density is low; lithium batteries have fast response and high power density, but continuous high current discharge has an adverse effect on the life and efficiency of lithium batteries. How to effectively combine hydrogen fuel cells and lithium batteries to provide power for rail transit vehicles is an urgent problem in the rail transit industry.

Contents of the invention

The purpose of the present invention is to provide a rail vehicle and its hydrogen energy hybrid traction control circuit and control method to solve the problems of slow power loading and low power density in the traditional technology of only using hydrogen fuel cells, and the problem of continuous High current discharge affects battery life and efficiency.

The present invention solves the above-mentioned technical problems through the following technical solutions: a hydrogen energy hybrid traction control circuit, which is applied to rail vehicles, and the control circuit includes:

Hydrogen fuel cell module;

A DC/DC converter whose first end is connected to the output end of the hydrogen fuel cell module, and whose second end is connected to the traction converter;

a lithium battery module arranged between the DC/DC converter and the traction converter;

The first management unit is connected to the control terminal of the hydrogen fuel cell module and used to control the output power of the hydrogen fuel cell module;

The second management unit is connected to the control terminal of the lithium battery module and is used to monitor the SOC state of the lithium battery module;

The DC/DC converter control unit is connected to the DC/DC converter, the first management unit and the second management unit respectively; the DC/DC converter control unit is used to obtain vehicle status signals and lithium batteries The module SOC controls the working state of the DC/DC converter and the output power of the hydrogen fuel cell module according to the vehicle state signal and the lithium battery module SOC, and realizes the power of the hydrogen fuel cell module and/or the lithium battery module to the traction converter. powered by.

Further, both the first management unit and the second management unit are communicatively connected with the DC/DC converter control unit through the CAN bus.

Further, the DC/DC converter control unit is communicated with the train control unit through the CAN bus, the train control unit is connected with the control handle and the power supply mode selection switch, and the DC/DC converter control unit is connected through the train The control unit acquires the vehicle state signal, wherein the vehicle state signal includes a power supply mode signal and a control handle signal.

Based on the same inventive concept, the present invention also provides a hydrogen energy hybrid traction control method, including:

When the power supply mode is hybrid power supply, the SOC of the lithium battery module is within the normal operating range, and the control handle is at zero, the DC/DC converter is controlled to be in the step-down mode, and the lithium battery module supplies the hydrogen fuel through the DC/DC converter. The battery module supplies power and prepares for the vehicle to start;

When the power supply mode is hybrid power supply, and the control handle is in the traction position and running with low power, the working mode of the DC/DC converter and the output power of the hydrogen fuel cell module are controlled according to the SOC of the lithium battery module, and the hydrogen fuel cell module and /or the lithium battery module supplies power to the traction converter; wherein, the low power operation means that the level signal of the control handle is less than or equal to the set value;

When the power supply mode is hybrid power supply, and the control handle is in the traction position and running at high power, the working mode of the DC/DC converter and the output power of the hydrogen fuel cell module are controlled according to the SOC of the lithium battery module, and the hydrogen fuel cell module and The lithium battery module, or the lithium battery module supplies power to the traction converter; wherein, the high-power operation means that the level signal of the control handle is greater than the set value;

When the power supply mode is hybrid power supply and the control handle is in the brake position, the DC/DC converter is controlled to limit the power to run or stop, and the hydrogen fuel cell module is controlled by the first management unit not to supply external power, and the lithium battery module absorbs the control energy generated by motion.

Preferably, the set value is 70% of the depth of the control handle.

Further, when the power supply mode is hybrid power supply, and the control handle is in the traction position and operates with low power, the specific implementation process of controlling the working mode of the DC/DC converter and the output power of the hydrogen fuel cell module according to the SOC of the lithium battery module for:

When the SOC of the lithium battery module ≤ the first set threshold, control the DC/DC converter to be in boost mode, and at the same time control the hydrogen fuel cell module to output at full power through the first management unit to supply power to the traction converter at the same time Charge the lithium battery module;

When the first set threshold < SOC of the lithium battery module ≤ the second set threshold, control the DC/DC converter to be in boost mode, and at the same time control the output power of the hydrogen fuel cell module to be equal to the traction power demand through the first management unit And the sum of the remaining power, while supplying power to the traction converter, charging the lithium battery module at the same time;

When the second set threshold value < SOC of the lithium battery module ≤ 100%, the DC/DC converter is controlled to be in a stopped state, and the hydrogen fuel cell module is controlled by the first management unit not to supply external power, and the lithium battery module supplies the traction converter power supply.

Further, during the process of adjusting the current output power of the hydrogen fuel cell module to the target output power, the lithium battery module and the hydrogen fuel cell module jointly supply power to the traction converter;

When the output power of the hydrogen fuel cell module reaches the target output power, the hydrogen fuel cell module supplies power to the traction converter and charges the lithium battery module at the same time;

Wherein, the target output power is the sum of full power or traction power demand and margin. The power of the hydrogen fuel cell module is loaded slowly. Before the output power of the hydrogen fuel cell module reaches the target output power, the lithium battery module and the hydrogen fuel cell module jointly supply power to the traction converter to ensure that the traction power requirement is met.

Further, the margin is equal to 5%-10% of the traction power requirement of the last calculation period.

Further, when the power supply mode is hybrid power supply, and the control handle is in the traction position and runs at high power, the specific implementation process of controlling the working mode of the DC/DC converter and the output power of the hydrogen fuel cell module according to the SOC of the lithium battery module for:

When the SOC of the lithium battery module ≤ the second set threshold, the DC/DC converter is controlled to be in boost mode, and the hydrogen fuel cell module is controlled by the first management unit to output at full power. The hydrogen fuel cell module and the lithium battery module jointly supply power to the traction converter;

When the second set threshold value < SOC of the lithium battery module ≤ 100%, the DC/DC converter is controlled to be in a stopped state, and the hydrogen fuel cell module is controlled by the first management unit not to supply external power, and the lithium battery module supplies the traction converter power supply.

Preferably, the first set threshold is 20%, and the second set threshold is 90%.

Based on the same inventive concept, the present invention also provides a rail vehicle, which is provided with the above-mentioned hydrogen energy hybrid traction control circuit.

Beneficial effect

Compared with the prior art, the present invention has the advantages of:

The rail vehicle and its hydrogen energy hybrid traction control circuit and control method provided by the present invention can realize the operation of the rail vehicle in the hybrid power supply mode and the lithium battery power supply mode, and operate in different working modes through the DC/DC converter The switching under the hood realizes the functional requirements of starting and supplying power from the lithium battery module to the hydrogen fuel cell module, charging from the hydrogen fuel cell module to the lithium battery module, low-power/high-power traction of rail vehicles, and regenerative braking energy absorption. The transmission between the fuel cell module, lithium battery module and traction converter, matching hydrogen fuel cell modules and lithium battery modules with different characteristics, so that they can give full play to their respective performance advantages, give full play to the locomotive traction performance advantages, and at the same time absorb the regenerated energy when the locomotive is running. Utilize regenerative braking energy to achieve the purpose of energy saving and environmental protection.

Description of drawings

In order to illustrate the technical solution of the present invention more clearly, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only an embodiment of the present invention. Ordinary technicians can also obtain other drawings based on these drawings without paying creative work.

Fig. 1 is a schematic diagram of a hydrogen energy hybrid traction control circuit in an embodiment of the present invention;

Fig. 2 is a flowchart of a hydrogen energy hybrid traction control method in an embodiment of the present invention.

Detailed ways

The technical solutions in the present invention are clearly and completely described below in combination with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The technical solution of the present application will be described in detail below with specific embodiments. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

As shown in Figure 1, a hydrogen energy hybrid traction control circuit provided by an embodiment of the present invention includes a hydrogen fuel cell module, a DC/DC converter, a lithium battery module, a first management unit FCCU, and a second management unit BMS and the DC/DC converter control unit CU; the first end of the DC/DC converter is connected to the output end of the hydrogen fuel cell module, and the second end is connected to the traction converter; the DC/DC converter is connected to the A lithium battery module is installed between the traction converters; the first management unit FCCU is connected to the control terminal of the hydrogen fuel cell module, and is used to control the output power of the hydrogen fuel cell module; the second management unit BMS and the control terminal of the lithium battery module The terminal is connected and used to monitor the SOC state of the lithium battery module; the DC/DC converter control unit CU is connected to the DC/DC converter, the first management unit FCCU and the second management unit BMS respectively;

The DC/DC converter control unit CU is used to obtain the vehicle status signal and the lithium battery module SOC, and control the working status of the DC/DC converter and the output power of the hydrogen fuel cell module according to the vehicle status signal and the lithium battery module SOC, Realize the power supply of the hydrogen fuel cell module and/or lithium battery module to the traction converter.

The lithium battery module is directly connected to the DC bus, which can quickly respond to the traction power demand of the vehicle, such as immediately absorbing the energy fed back during regenerative braking of the vehicle, and releasing it in the next stage of vehicle traction, so that the energy of regenerative braking can be efficiently recovered and utilized. The lithium battery module also has the function of stabilizing the DC bus voltage. When the vehicle is running with low-power traction, the hydrogen fuel cell module supplies power to the traction converter through the DC/DC converter, and the lithium battery module serves as an immediate response power supply when the vehicle power changes, and at the same time, the hydrogen fuel cell module can charge the lithium battery module ; When the vehicle is in high-power traction operation, the hydrogen fuel cell module supplies power to the traction converter through the DC/DC converter and the lithium battery module.

In principle, the DC/DC converter is a Buck-Boost (buck-boost) circuit. By controlling the DC/DC converter in the boost or step-down bidirectional working mode, the energy in the hydrogen fuel cell module and lithium battery module can be realized. And the energy transmission between traction converters is the core component of the charge and discharge control of the energy storage power pack composed of hydrogen fuel cell modules and lithium battery modules. The DC/DC converter has four working modes, which are working mode 1: the lithium battery module supplies power to the hydrogen fuel cell module to start; working mode 2: low-power traction of the vehicle; working mode 3: high-power traction of the vehicle; working mode 4 : Vehicle regenerative braking.

The first management unit FCCU, the second management unit BMS and the train control unit CCU respectively communicate with the DC/DC converter control unit CU through the CAN bus. When the vehicle is running, the first management unit FCCU sends the hydrogen fuel cell output power signal, the second management unit BMS sends the lithium battery SOC state signal to the DC/DC converter control unit CU, and the train control unit CCU transmits the vehicle state signal To the DC/DC converter control unit CU, the vehicle status signal includes the hybrid/hydrogen fuel cell/lithium battery power supply mode signal sent by the power supply mode selection switch and the traction/brake handle signal sent by the driver control handle. The DC/DC converter control unit CU judges whether the execution conditions of the four working modes of the DC/DC converter are met according to the input signal, and outputs the step-up/down signal to the DC/DC converter. When the step-down signal is output When the lithium battery module supplies power to the hydrogen fuel cell module, when the boost signal is output, the hydrogen fuel cell module supplies power to the outside to complete the charge and discharge control of the energy storage power pack.

Based on the same inventive concept, as shown in Figure 2, the present invention also provides a hydrogen energy hybrid traction control method, including:

Working mode 1: The lithium battery module supplies power to the hydrogen fuel cell module to start

When the vehicle is started, the lithium battery module supplies power to the hydrogen fuel cell module through the DC/DC converter to start, preparing for the operation of the vehicle. The execution conditions are:

(1) The SOC of the lithium battery module is within the normal operating range and no failure is reported;

(2) The output power signal of the hydrogen fuel cell module does not report a failure;

(3) The power supply mode is a hybrid power supply mode;

(4) The driver's control handle is in the "zero position" working condition.

That is, when the power supply mode is hybrid power supply, the SOC of the lithium battery module is within the normal operating range, and the control handle is at zero, the DC/DC converter is controlled to be in the step-down mode, and the lithium battery module is supplied to the battery through the DC/DC converter. The hydrogen fuel cell module supplies power in preparation for the vehicle to start.

Working mode 2: Vehicle traction with low power

When the vehicle is in low-power traction operation, the hydrogen fuel cell module is given priority to power the traction circuit, and the lithium battery module is used as a buffer (supplementing insufficient power supply of the hydrogen fuel cell module or absorbing excess power supply of the hydrogen fuel cell module). Execution conditions:

(1) The SOC of the lithium battery module is within the normal operating range and no failure is reported;

(2) The output power signal of the hydrogen fuel cell module does not report a failure;

(3) The power supply mode is a hybrid power supply mode;

(4) The driver's control handle is in the "traction" working condition, and the level signal of the handle is less than or equal to 70% of the depth of the control handle (low power operation).

That is, when the power supply mode is hybrid power supply, and the control handle is in the traction position and operates with low power, the working mode of the DC/DC converter and the output power of the hydrogen fuel cell module are controlled according to the lithium battery module SOC, and the hydrogen fuel cell modules and/or lithium battery modules supply power to the traction converter.

When the vehicle is running with low-power traction, the hydrogen fuel cell module supplies power to the traction converter through the DC/DC converter, and the lithium battery module serves as an immediate response power supply when the vehicle power changes, and at the same time, the hydrogen fuel cell module can charge the lithium battery module , at this time the maximum power of the DC/DC converter is the rated output power of the hydrogen fuel cell module, and the DC/DC converter is in boost mode.

When the SOC of the lithium battery module is within the normal operating range, assuming that the traction power demand is X1, the output power of the hydrogen fuel cell module depends on the traction power demand X1. There may be errors in the calculation of the traction power demand, so the margin X2 is added on the basis of the traction power demand to ensure that the output power of the hydrogen fuel cell module can meet the traction power demand of the locomotive, that is, the output power of the hydrogen fuel cell module=X1+X2, The excess power after feeding the traction converter is absorbed by the lithium battery module.

As shown in Table 1, when the vehicle is running at low power, the specific implementation process of controlling the working mode of the DC/DC converter and the output power of the hydrogen fuel cell module according to the SOC of the lithium battery module is as follows:

When the SOC of the lithium battery module is less than or equal to the first set threshold, the DC/DC converter is controlled to be in boost mode, and at the same time, the first management unit FCCU is used to control the hydrogen fuel cell module to output at full power to supply power to the traction converter At the same time, charge the lithium battery module;

When the first set threshold < the SOC of the lithium battery module ≤ the second set threshold, control the DC/DC converter to be in boost mode, and at the same time control the output power of the hydrogen fuel cell module to be equal to the traction power through the first management unit FCCU The sum of demand and surplus, while supplying power to the traction converter, it charges the lithium battery module at the same time;

When the second set threshold value<SOC of the lithium battery module≤100%, the DC/DC converter is controlled to be in a stopped state, and the hydrogen fuel cell module is controlled by the first management unit FCCU to not supply power to the outside, and the lithium battery module supplies power to the traction transformer. Current converter power supply.

Table 1 Specific control conditions during low power operation

Due to the slow power loading of the hydrogen fuel cell module, the output power of the hydrogen fuel cell module cannot meet the traction power requirement before the output power of the hydrogen fuel cell module reaches the target output power. The traction converter supplies power, that is, in the process of adjusting the current output power of the hydrogen fuel cell module to the target output power, the lithium battery module and the hydrogen fuel cell module jointly supply power to the traction converter. When the output power of the hydrogen fuel cell module reaches the target output power, the output power of the hydrogen fuel cell module can meet the traction power demand, so the hydrogen fuel cell module supplies power to the traction converter while the excess power charges the lithium battery module. Wherein, the target output power is the sum of full power or traction power demand and margin.

In this embodiment, the margin X2 is equal to 5%-10% of the traction power demand X1 in the last calculation period. The first set threshold is 20%, and the second set threshold is 90%.

Working mode 3: High-power traction of vehicles

When the vehicle is in high-power traction operation, the hydrogen fuel cell module fully outputs power to the traction circuit, and the lithium battery module supplements the insufficient power supply of the hydrogen fuel cell module. Execution conditions:

(1) The SOC of the lithium battery module is within the normal operating range and no failure is reported;

(2) The output power signal of the hydrogen fuel cell module does not report a failure;

(3) The power supply mode is a hybrid power supply mode;

(4) The driver's control handle is in the "traction" working condition, and the level signal of the handle is greater than 70% of the depth of the control handle (high power operation).

That is, when the power supply mode is hybrid power supply, and the control handle is in the traction position and running at high power, the working mode of the DC/DC converter and the output power of the hydrogen fuel cell module are controlled according to the lithium battery module SOC, and the hydrogen fuel cell module and the lithium battery module, or the lithium battery module supplies power to the traction converter.

When the vehicle is running with high-power traction, the hydrogen fuel cell module supplies power to the traction converter through the DC/DC converter and the lithium battery module. At this time, the maximum power of the DC/DC converter is the rated output power of the hydrogen fuel cell module, and the DC/DC converter is in boost mode.

When the SOC of the lithium battery module is within the normal working range, the hydrogen fuel cell module outputs at full capacity; when the SOC of the lithium battery module is too high, the hydrogen fuel cell module enters the idle mode and does not supply power to the outside. At this time, the lithium battery module provides power. The control conditions are shown in Table 2.

Table 2 Specific control conditions during high-power operation

That is, when the SOC of the lithium battery module ≤ the second set threshold, the DC/DC converter is controlled to be in boost mode, and the hydrogen fuel cell module is controlled by the first management unit FCCU to output at full power, and the hydrogen fuel cell module and The lithium battery modules jointly supply power to the traction converter; when the second set threshold value<SOC of the lithium battery module≤100%, the DC/DC converter is controlled to be in a stopped state, and the hydrogen fuel cell module is controlled by the first management unit FCCU No external power supply is provided, and the traction converter is powered by the lithium battery module.

Working mode 4: regenerative braking working condition

When the vehicle performs regenerative braking, the hydrogen fuel cell module stops output, and the lithium battery module absorbs the energy generated by braking. Execution conditions:

(1) The SOC of the lithium battery module is within the normal operating range and no failure is reported;

(2) The output power signal of the hydrogen fuel cell module does not report a failure;

(3) The power supply mode is a hybrid power supply mode;

(4) The driver's control handle is in the "braking" working condition.

That is, when the power supply mode is hybrid power supply and the control handle is in the brake position, the DC/DC converter is controlled to limit the power to run or stop, and the first management unit FCCU controls the hydrogen fuel cell module to not supply external power, and the lithium battery The modules absorb energy from braking.

When the vehicle is in the regenerative braking condition, the DC/DC converter will limit the power to operate or stop working when the traction circuit voltage rises abnormally due to the feedback energy of the regenerative braking of the vehicle. The hydrogen fuel cell module enters the idle mode and does not supply power to the outside. At this time, the lithium battery module absorbs the energy generated by braking.

What is disclosed above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field can easily think of changes or modifications within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention.

Claims (10)

1. A hydrogen energy source hybrid traction control circuit applied to a rail vehicle is characterized by comprising:

a hydrogen fuel cell module;

a DC/DC converter, the first end of which is connected with the output end of the hydrogen fuel cell module, and the second end of which is connected with a traction converter;

the lithium battery module is arranged between the DC/DC converter and the traction converter;

the first management unit is connected with the control end of the hydrogen fuel cell module and is used for controlling the output power of the hydrogen fuel cell module;

the second management unit is connected with the control end of the lithium battery module and is used for monitoring the SOC state of the lithium battery module;

the DC/DC converter control unit is respectively connected with the DC/DC converter, the first management unit and the second management unit; the DC/DC converter control unit is used for acquiring a vehicle state signal and a lithium battery module SOC, and controlling the working state of the DC/DC converter and the output power of the hydrogen fuel cell module according to the vehicle state signal and the lithium battery module SOC, so that the hydrogen fuel cell module and/or the lithium battery module can supply power to the traction converter.

2. The hydrogen energy source hybrid traction control circuit according to claim 1, characterized in that: and the first management unit and the second management unit are in communication connection with the DC/DC converter control unit through a CAN bus.

3. The hydrogen energy source hybrid traction control circuit according to claim 1 or 2, characterized in that: the DC/DC converter control unit is in communication connection with the train control unit through a CAN bus, the train control unit is connected with the control handle and the power supply mode selection switch, and the DC/DC converter control unit acquires the vehicle state signal through the train control unit, wherein the vehicle state signal comprises a power supply mode signal and a control handle signal.

4. A hydrogen energy hybrid traction control method is characterized by comprising the following steps:

when the power supply mode is hybrid power supply, the SOC of the lithium battery module is in a normal working range and the control handle is at a zero position, the DC/DC converter is controlled to be in a voltage reduction mode, and the lithium battery module supplies power to the hydrogen fuel battery module through the DC/DC converter to prepare for starting a vehicle;

when the power supply mode supplies power for the hybrid power and the control handle is at a traction position and runs with low power, the working mode of the DC/DC converter and the output power of the hydrogen fuel cell module are controlled according to the SOC of the lithium battery module, and the hydrogen fuel cell module and/or the lithium battery module supplies power to the traction converter; wherein, the low-power operation means that the level signal of the control handle is less than or equal to a set value;

when the power supply mode supplies power for the hybrid power and the control handle is in a traction position and runs at high power, the working mode of the DC/DC converter and the output power of the hydrogen fuel cell module are controlled according to the SOC of the lithium battery module, and the hydrogen fuel cell module and the lithium battery module or the lithium battery module supply power for the traction converter; wherein, the high-power operation means that the level signal of the control handle is greater than a set value;

when the power supply mode supplies power for the hybrid power and the control handle is located at a braking position, the DC/DC converter is controlled to limit power to operate or stop, the hydrogen fuel cell module is controlled not to supply power to the outside through the first management unit, and the lithium battery module absorbs energy generated by braking;

preferably, the set point is 70% of the depth of the control handle.

5. The hydrogen energy hybrid traction control method according to claim 4, wherein when the power supply mode is hybrid power supply and the control handle is in traction position and running with low power, the specific implementation process of controlling the operation mode of the DC/DC converter and the output power of the hydrogen fuel cell module according to the SOC of the lithium battery module is as follows:

when the SOC of the lithium battery module is less than or equal to a first set threshold value, the DC/DC converter is controlled to be in a boosting mode, and meanwhile, the hydrogen fuel battery module is controlled to output at full power through the first management unit, so that the power is supplied to the traction converter and the lithium battery module is charged;

when the SOC of the lithium battery module is smaller than the first set threshold and smaller than or equal to the second set threshold, the DC/DC converter is controlled to be in a boosting mode, meanwhile, the output power of the hydrogen fuel battery module is controlled to be equal to the sum of the traction power demand and the allowance through the first management unit, and the lithium battery module is charged while the power is supplied to the traction converter;

when the second set threshold value is smaller than the SOC of the lithium battery module and smaller than or equal to 100%, the DC/DC converter is controlled to be in a stop state, the hydrogen fuel battery module is controlled not to supply power to the outside through the first management unit, and the lithium battery module supplies power to the traction converter.

6. The hydrogen energy hybrid traction control method according to claim 5, wherein the traction converter is powered by both the lithium battery module and the hydrogen fuel cell module in the process of adjusting the current output power of the hydrogen fuel cell module to the target output power;

when the output power of the hydrogen fuel cell module reaches the target output power, the hydrogen fuel cell module supplies power to the traction converter and simultaneously charges the lithium battery module;

wherein the target output power is the sum of the full power or traction power demand and the margin.

7. A hydrogen powered hybrid traction control method as claimed in any one of claims 4 to 6, characterized in that the margin is equal to 5% to 10% of the traction power demand of the last calculation cycle.

8. The hydrogen energy hybrid traction control method according to claim 4, wherein when the power supply mode is hybrid power supply and the control handle is in traction position and is in high-power operation, the specific implementation process of controlling the operation mode of the DC/DC converter and the output power of the hydrogen fuel cell module according to the SOC of the lithium battery module is as follows:

when the SOC of the lithium battery module is less than or equal to a second set threshold value, the DC/DC converter is controlled to be in a boosting mode, the hydrogen fuel battery module is controlled to output at full power through the first management unit, and the hydrogen fuel battery module and the lithium battery module jointly supply power to the traction converter;

when the second set threshold value is smaller than the SOC of the lithium battery module and smaller than or equal to 100%, the DC/DC converter is controlled to be in a stop state, the hydrogen fuel battery module is controlled not to supply power to the outside through the first management unit, and the lithium battery module supplies power to the traction converter.

9. The hydrogen energy source hybrid traction control method according to claim 5 or 8, characterized in that the first set threshold is 20% and the second set threshold is 90%.

10. A rail vehicle, characterized in that the rail vehicle is provided with a hydrogen energy hybrid traction control circuit according to any one of claims 1 to 3.

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