WO2022206126A1 - Hybrid power control method and device, and vehicle - Google Patents

Abstract

A hybrid power control method and device, and a vehicle. In the solution, consumed power on a high-voltage bus and output power of a fuel cell are firstly acquired, and when the output power of the fuel cell is smaller than the consumed power on the high-voltage bus, namely, the output power of the fuel cell is not enough to supply power to a load, the output power of the fuel cell is controlled to be increased so as to supply power to the load; in addition, considering that the response speed is relatively slow when the output power of the fuel cell changes, the output power of the fuel cell is possibly insufficient in the process to enable the load to normally operate; therefore, the output power of a power cell is controlled to be combined with the fuel cell so as to supply power to the load, avoiding the situation in which the load cannot normally operate due to the output power of the fuel cell being insufficient so as to supply power to the load during said process due to the response speed being relatively low when the output power of the fuel cell changes, and thus improving the reliability of power supply to the load.

Description

A hybrid control method, device and vehicle

This application claims the priority of the Chinese patent application with the application number 202110361639.2 and the invention titled "A hybrid control method, device and vehicle", which was submitted to the China Patent Office on April 2, 2021, the entire contents of which are incorporated by reference in this application.

technical field

The present invention relates to the field of train power supply, in particular to a hybrid power control method, device and vehicle.

Background technique

Due to the advantages of non-polluting and high energy density of hydrogen fuel cells, current trains usually use hydrogen fuel cells as fuel to supply power to the loads connected to the high-voltage bus through the high-voltage bus on the train. When the power required by the load is greater than that provided by the fuel cell When the power of the fuel cell is increased, it is necessary to control the output power of the fuel cell to increase to supply power to the load, but the response speed of controlling the increase of the output power of the fuel cell is slow, and it takes a certain time to adjust the output power of the fuel cell to the needs of the load. In this process, since the output power of the fuel cell is insufficient to provide the power required by the load, the normal operation of the load may be affected, and the reliability of the power supply is low.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a hybrid power control method, device and vehicle, which avoids the fact that the output power of the fuel cell is insufficient to supply power to the load during the process due to the slow response speed when the output power of the fuel cell changes, so that the load In the case of not working normally, the reliability of supplying power to the load is improved.

In order to solve the above technical problems, the present invention provides a hybrid control method, including:

Obtaining the power consumption on the high-voltage bus, where the power consumption is the sum of the required powers of the loads connected to the high-voltage bus;

Obtain the output power of the fuel cell;

judging whether the power consumption is greater than the output power of the fuel cell;

If so, control the output power of the fuel cell to increase, and control the fuel cell to be combined with the power battery to supply power to the load through the high-voltage bus;

If not, the fuel cell is controlled to supply power to the load alone.

Preferably, the fuel cell is connected to the high-voltage bus through a DC/DC converter DC/DC conversion module;

Controlling the increase of the output power of the fuel cell includes:

The output current of the DC/DC conversion module is controlled to increase.

Preferably, after controlling the fuel cell to supply power to the load alone, the method further includes:

Obtain the power information of the power battery;

Determine whether the power of the power battery is less than a preset power based on the power information of the power battery;

If so, controlling the fuel cell to charge the power battery;

If not, the output power of the fuel cell is controlled to decrease.

Preferably, the fuel cell is connected to the high-voltage bus through a DC/DC conversion module;

Controlling fuel cell output reductions, including:

The output current of the DC/DC conversion module is controlled to decrease.

Preferably, before acquiring the power consumption on the high-voltage bus, the method further includes:

The fuel cell is controlled to be turned on to supply power to the load through the high voltage bus.

Preferably, the front end of the fuel cell is connected to a fuel storage device through a fuel pipeline, and the rear end of the fuel cell is connected to the high-voltage bus through a DC/DC conversion module;

Before controlling the fuel cell to be turned on, the method further includes:

controlling the opening of the fuel storage device, the conduction of the fuel pipeline and the opening of the DC/DC conversion module;

Controlling the fuel cell to turn on to supply power to the load through the high voltage bus includes:

The fuel cell is controlled to be turned on to supply power to the load through the DC/DC conversion module and the high voltage bus.

Preferably, before controlling the opening of the fuel storage device, the conduction of the fuel pipeline and the opening of the DC/DC conversion module, the method further includes:

controlling the power battery to be turned on;

obtain the output voltage of the power battery;

Controlling the fuel cell to turn on to supply power to the load through the DC/DC conversion module and the high voltage includes:

The output voltage of the fuel cell through the DC/DC conversion module is used to adjust the output voltage of the fuel cell as the target output voltage of the fuel cell.

Preferably, it also includes:

judging whether the fuel cell can continuously output power;

If not, control the output power of the power battery to supply power to the load through the high-voltage bus.

In order to solve the above technical problems, the present invention also provides a hybrid control device, comprising:

memory for storing computer programs;

The processor is configured to implement the steps of the hybrid control method described above when executing the computer program.

In order to solve the above technical problem, the present invention also provides a vehicle, including the above-mentioned hybrid control device.

The present application provides a hybrid power control method, in which the power consumption on the high-voltage bus and the output power of the fuel cell are obtained first, and when the output power of the fuel cell is less than the power consumption on the high-voltage bus, the fuel When the output power of the battery is not enough to supply power to the load, the output power of the fuel cell is controlled to increase to supply power to the load, and considering the slow response speed when the output power of the fuel cell changes, the output power of the fuel cell may be insufficient during this process. Make the load work normally, therefore, also control the output power of the power battery to combine with the fuel cell to supply power to the load, to avoid the slow response speed when the output power of the fuel cell changes, so that the output power of the fuel cell may be insufficient in the process. The reliability of supplying power to the load is improved because the load is supplied with power and the load cannot work normally.

The present application also provides a hybrid control device and a vehicle, which have the same beneficial effects as the hybrid control method described above.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the prior art and the accompanying drawings required in the embodiments. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic flowchart of a hybrid control method provided by the present invention;

FIG. 2 is a structural block diagram of a hybrid control device provided by the present invention.

Detailed ways

The core of the present invention is to provide a hybrid power control method, device and vehicle, which avoids the fact that the output power of the fuel cell is insufficient to supply power to the load during the process due to the slow response speed when the output power of the fuel cell changes, so that the load In the case of not working normally, the reliability of supplying power to the load is improved.

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic flowchart of a hybrid control method provided by the present invention. The method includes:

S11: Obtain the power consumption on the high-voltage bus, and the power consumption is the sum of the required power of the loads connected to the high-voltage bus;

S12: obtain the output power of the fuel cell;

S13: judging whether the power consumption is greater than the output power of the fuel cell;

S14: If yes, control the output power of the fuel cell to increase, and control the combination of the fuel cell and the power battery to supply power to the load through the high-voltage bus;

S15: If no, control the fuel cell to supply power to the load alone.

Considering that when the fuel cell is used to supply power to the load connected to the high-voltage bus through the high-voltage bus on the train, if the power required by the load is greater than the output power of the fuel cell, it is necessary to control the output power of the fuel cell to increase to ensure the normal operation of the load, but The response speed of controlling the increase of the output power of the fuel cell is slow, and it takes a certain time to adjust the output power of the fuel cell to the power required by the load. The required power may affect the normal operation of the load, and the reliability of the power supply is low.

In order to solve the above-mentioned technical problems, the design idea of the present application is to use other batteries or power sources to provide power to be compatible with the fuel cell when the output power of the fuel cell needs to be changed, especially when the output power of the fuel cell is not enough to supply power for the load. Combined, so that the sum of the output power is sufficient to provide the load with the required power for the load to work properly.

Based on this, in this solution, the power consumption on the high-voltage bus and the output power of the fuel cell are obtained first, and when the output power of the fuel cell is less than the power consumption on the high-voltage bus, that is, the output power of the fuel cell is insufficient to supply power to the load When the output power of the fuel cell is controlled to increase to supply power to the load, and considering the slow response speed when the output power of the fuel cell changes, it may occur that the output power of the fuel cell is not enough to make the load work normally. , and also controls the power battery output power to be combined with the fuel cell to supply power to the load, to avoid the slow response speed when the output power of the fuel cell changes. Under normal working conditions, the reliability of supplying power to the load is improved.

It should be noted that the power battery in the present application can be, but is not limited to, a rechargeable battery, and when the battery power is insufficient, it can be charged to improve the utilization rate of the power battery. In addition, the power battery in this application can, but is not limited to, only supply power to the load connected to the high-voltage bus, and can also supply power to other low-voltage devices. The application does not limit the load connected to the high-voltage bus in this application.

To sum up, the hybrid power control method provided by the present application can supply power to the load, and when the output power of the fuel cell is insufficient to supply power to the load, the joint output power of the power battery and the fuel cell can be controlled to improve the power supply for the load. reliability.

On the basis of the above-mentioned embodiment:

As a preferred embodiment, the fuel cell is connected to the high-voltage bus through a DC/DC (DC-DC converter, DC/DC converter) conversion module;

Controlling fuel cell output power increases, including:

Control the output current of the DC/DC conversion module to increase.

Considering that the voltage of the high-voltage bus on the train is a relatively large high-voltage power, and the output voltage of the fuel cell generally cannot reach the high-voltage power required by the high-voltage bus, therefore, in the present application, between the fuel cell and the high-voltage bus A DC/DC conversion module is also provided for boosting the voltage output by the fuel cell to supply power to the load through the high-voltage bus.

Specifically, when the output power of the fuel cell is controlled to increase in this application, in order to ensure the voltage stability of the load connected to the high-voltage bus, the output voltage of the DC/DC conversion module is controlled to remain unchanged in this application, so that the The output current increases, thereby increasing the output power of the fuel cell.

In addition, it should be noted that when the output current of the DC/DC conversion module is controlled to increase, the output voltage of the DC/DC conversion module may fluctuate somewhat, but the principle when controlling the output power of the fuel cell to increase is to control the DC/DC conversion module. The output voltage of the /DC conversion module remains unchanged, and only the output current of the DC/DC conversion module is controlled to increase.

In addition, the DC/DC conversion module in the present application is a single-phase DC/DC conversion module, which can prevent the voltage on the high-voltage bus from being fed back to the fuel cell to avoid damage.

To sum up, the method of controlling the increase of the output power of the fuel cell in the present application is simple and easy to implement, and the stability of the voltage for supplying power to the load can be ensured.

As a preferred embodiment, after controlling the fuel cell to supply power to the load alone, the method further includes:

Get the power information of the power battery;

Determine whether the power of the power battery is less than the preset power based on the power information of the power battery;

If so, control the fuel cell to charge the power battery;

If not, the output power of the fuel cell is controlled to decrease.

When it is determined that the output power of the fuel cell is not less than the consumption power, that is, the output power of the fuel cell may be greater than the consumption power, in this case, the output power of the fuel cell may be wasted.

In order to solve the above technical problems, in this application, after controlling the fuel cell to supply power to the load alone, that is, when it is determined that the output power of the fuel cell is not less than the power consumption, the power battery information is also obtained. When the electricity is charged, the fuel cell is controlled to charge the power battery to consume the excess output power of the fuel cell. It is also considered that the power of the power battery may be relatively sufficient, that is, when the power of the power battery is not less than the preset power, the power battery does not need to be charged. At this time, in order to avoid the waste of the output power of the fuel cell, at this time, Reduce the output power of the fuel cell.

To sum up, by adopting the method in the present application, the waste of output power of the fuel cell can be avoided, thereby improving the energy utilization rate.

As a preferred embodiment, the fuel cell is connected to the high-voltage bus through a DC/DC conversion module;

Controlling fuel cell output reductions, including:

The output current of the control DC/DC conversion module is reduced.

Considering that the voltage of the high-voltage bus on the train is a relatively large high-voltage power, and the output voltage of the fuel cell generally cannot reach the high-voltage power required by the high-voltage bus, therefore, in the present application, between the fuel cell and the high-voltage bus A DC/DC conversion module is also provided for boosting the voltage output by the fuel cell to supply power to the load through the high-voltage bus.

Specifically, when the output power of the fuel cell is controlled to decrease in this application, in order to ensure the voltage stability of the load connected to the high-voltage bus, the output voltage of the DC/DC conversion module is controlled to remain unchanged in this application, so that the output voltage of the DC/DC conversion module is kept constant. The current decreases, which in turn reduces the output power of the fuel cell.

In addition, it should be noted that when the output current of the DC/DC conversion module is controlled to decrease, the output voltage of the DC/DC conversion module may fluctuate somewhat, but the principle when controlling the output power of the fuel cell to decrease is to control the DC/DC The output voltage of the conversion module remains unchanged, and only the output current of the DC/DC conversion module is controlled to decrease.

To sum up, the method of controlling the output power reduction of the fuel cell in the present application is simple and easy to implement, and the stability of the voltage supplying power to the load can be ensured.

As a preferred embodiment, before acquiring the power consumption on the high-voltage bus, the method further includes:

The fuel cell is controlled to turn on to supply power to the load through the high voltage bus.

The purpose of the present application is to provide that before obtaining the power consumption of the high-voltage bus, it is necessary to control the fuel cell to turn on and then supply power to the load through the high-voltage bus, so as to ensure the reliability of the power supply.

As a preferred embodiment, the front end of the fuel cell is connected to the fuel storage device through a fuel pipeline, and the rear end of the fuel cell is connected to the high-voltage busbar through a DC/DC conversion module;

Before controlling the fuel cell to turn on, it also includes:

Control the opening of the fuel storage device, the conduction of the fuel pipeline and the opening of the DC/DC conversion module;

Control the fuel cell to turn on to supply power to the load through the high voltage bus, including:

The fuel cell is controlled to be turned on to supply power to the load through the DC/DC conversion module and the high-voltage bus.

Considering that the front end of the battery is connected to the fuel storage device through the fuel pipeline, and the rear end of the fuel cell is connected to the high-voltage bus through the DC/DC conversion module, if the fuel cell and the fuel storage device are directly connected to the DC/DC conversion module and fuel pipeline at the same time , the fuel cell may fail to shut down due to insufficient fuel supply for the fuel cell.

In order to solve the above technical problems, before controlling the opening of the fuel cell, the present application first puts in the DC/DC and conducts the fuel pipeline and the fuel storage device, and then puts into the fuel cell, that is, controls the opening of the fuel cell.

It should be noted that, based on the above description, when the fuel cell needs to be shut down later, in order to prevent insufficient fuel supply of the fuel cell, it is necessary to shut down the fuel cell first, and then shut down the fuel storage device, fuel pipeline and DC/DC conversion module. It is limited to ensure that the fuel cell is in a normal fuel supply state when the fuel cell is turned on and off through time sequence control, and avoids the working condition that the fuel cell fails to shut down due to insufficient fuel supply. Furthermore, the fuel in the present application can be, but is not limited to, hydrogen.

To sum up, in the present application, the operating condition of the fuel cell shutdown due to insufficient fuel supply is avoided, and the reliability of the fuel cell operation is improved.

As a preferred embodiment, before controlling the opening of the fuel storage device, the conduction of the fuel pipeline and the opening of the DC/DC conversion module, the method further includes:

Control the power battery to open;

Get the output voltage of the power battery;

Control the fuel cell to turn on to supply power to the load through the DC/DC conversion module and high voltage, including:

The output voltage of the power battery is used as the target output voltage of the fuel cell to adjust the voltage output by the fuel cell through the DC/DC conversion module.

Considering that the output voltage of the power battery is unstable, if the fuel cell is started first, and then the power battery is started, the output voltage of the power battery may be greater than the output voltage of the fuel cell, resulting in a pressure difference. At this time, the power battery may pass through. The high-voltage bus will cause current backflow to the DC/DC conversion module, which may cause damage to the DC/DC conversion module.

In order to solve the above technical problems, when the power battery and the fuel cell are turned on, the application first controls the power battery to turn on, and then in order to avoid the pressure difference, after the power battery is turned on, the application uses the output voltage of the power battery as the target voltage to adjust the fuel. The voltage output by the battery through the DC/DC conversion module.

It should be noted that, considering that the output power of the fuel cell is not less than the power consumption of the high-voltage bus and the power of the power battery is less than the preset power, the fuel cell needs to charge the power battery. Therefore, in this application, according to the output voltage of the power battery When adjusting the output voltage of the fuel cell, the output voltage of the fuel cell will be adjusted to be slightly larger than the output voltage of the power battery. Specifically, the output voltage of the fuel cell is larger than the output voltage of the power battery to the extent that the power battery can be charged. It depends on the actual situation. This application is no longer limited here.

To sum up, the method in the present application can avoid a pressure difference between the power battery and the output end of the DC/DC conversion module, thereby avoiding damage to the DC/DC conversion module.

As a preferred embodiment, it also includes:

Determine whether the fuel cell can continuously output power;

If not, control the output power of the power battery to supply power to the load through the high-voltage bus.

Considering that the fuel cell may fail due to insufficient fuel cell supply or other reasons, the fuel cell may fail or cannot continuously output power, etc. At this time, in order to ensure that the load on the train can work normally, the application will not be able to continue to output power when the fuel cell cannot continue to output power. , using the power battery output power to supply power to the load, thus ensuring the reliability of the load power supply.

In conclusion, by adopting the method in the present application, the reliability of supplying power to the load can be guaranteed.

Please refer to FIG. 2. FIG. 2 is a structural block diagram of a hybrid control device provided by the present invention. The device includes:

Memory 1, used to store computer programs;

The processor 2 is configured to implement the steps of the above-mentioned hybrid control method when executing the computer program.

In order to solve the above technical problems, the present application also provides a hybrid control device, wherein the module for controlling the power battery on or off in the present application can be, but is not limited to, the train main control module, and the train main control module is also used to obtain The power consumption on the high-voltage bus and the output power of the fuel cell; the power consumption is the sum of the required power of the load connected to the high-voltage bus; the module for judging whether the power consumption is greater than the output power and controlling the opening and closing of the fuel cell can be but not limited to Energy management module. Among them, the transmission between the energy management module and the train main control module is carried out through the network. However, considering that the network may fail, there are also traction hard lines, braking hard lines, fuel cell fault hard lines, power battery fault hard lines and fuel cell opening faults between the train main control module and the energy management module of the present application. Hard line, between the main control module of the train and the power battery, there is also a hard line for turning on and off the power battery. When the network system fails, the corresponding hard line is controlled to realize emergency traction under the network communication failure.

For other introductions to the hybrid power control device provided in the present application, please refer to the above method embodiments, which will not be repeated in the present application.

A vehicle includes the above hybrid control device.

For other introductions to the vehicle provided in this application, please refer to the above method embodiments, which will not be repeated in this application.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations. There is no such actual relationship or sequence between operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A hybrid control method, comprising:

   Obtaining the power consumption on the high-voltage bus, where the power consumption is the sum of the required powers of the loads connected to the high-voltage bus;

   Obtain the output power of the fuel cell;

   judging whether the power consumption is greater than the output power of the fuel cell;

   If so, control the output power of the fuel cell to increase, and control the fuel cell to be combined with the power battery to supply power to the load through the high-voltage bus;

   If not, the fuel cell is controlled to supply power to the load alone.
2. The hybrid power control method of claim 1, wherein the fuel cell is connected to the high-voltage bus through a DC/DC converter DC/DC conversion module;

   Controlling the increase of the output power of the fuel cell includes:

   The output current of the DC/DC conversion module is controlled to increase.
3. The hybrid power control method according to claim 1, wherein after controlling the fuel cell to supply power to the load alone, the method further comprises:

   Obtain the power information of the power battery;

   Determine whether the power of the power battery is less than a preset power based on the power information of the power battery;

   If so, controlling the fuel cell to charge the power battery;

   If not, the output power of the fuel cell is controlled to decrease.
4. The hybrid power control method according to claim 3, wherein the fuel cell is connected to the high-voltage bus through a DC/DC conversion module;

   Controlling fuel cell output reductions, including:

   The output current of the DC/DC conversion module is controlled to decrease.
5. The hybrid power system control method according to claim 1, wherein before acquiring the power consumption on the high-voltage bus, the method further comprises:

   The fuel cell is controlled to be turned on to supply power to the load through the high voltage bus.
6. The hybrid power control method according to claim 5, wherein the front end of the fuel cell is connected to the fuel storage device through a fuel pipe, and the rear end of the fuel cell is connected to the fuel storage device through a fuel pipe.

   The DC/DC conversion module is connected to the high-voltage bus;

   Before controlling the fuel cell to be turned on, the method further includes:

   controlling the opening of the fuel storage device, the conduction of the fuel pipeline and the opening of the DC/DC conversion module;

   Controlling the fuel cell to turn on to supply power to the load through the high voltage bus includes:

   The fuel cell is controlled to be turned on to supply power to the load through the DC/DC conversion module and the high voltage bus.
7. The hybrid power control method according to claim 6, wherein before controlling the opening of the fuel storage device, the conduction of the fuel pipeline, and the opening of the DC/DC conversion module, the method further comprises:

   controlling the power battery to be turned on;

   obtain the output voltage of the power battery;

   Controlling the fuel cell to turn on to supply power to the load through the DC/DC conversion module and the high voltage includes:

   The output voltage of the fuel cell through the DC/DC conversion module is used to adjust the output voltage of the fuel cell as the target output voltage of the fuel cell.
8. The hybrid control method according to any one of claims 1-7, further comprising:

   judging whether the fuel cell can continuously output power;

   If not, control the output power of the power battery to supply power to the load through the high-voltage bus.
9. A hybrid power control device is characterized in that, comprising:

   memory for storing computer programs;

   The processor is configured to implement the steps of the hybrid control method according to any one of claims 1-8 when executing the computer program.
10. A vehicle comprising the hybrid control device according to claim 9 .

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