KR20080053864A - Fuel cell super cap hybrid vehicle applied battery system and method control distributing power thereof - Google Patents

Abstract

A fuel cell super cap hybrid vehicle adopting a battery system and a control method of distributing power thereof are provided to more efficiently and actively drive a fuel cell super cap hybrid system in super cap precharging and regenerative braking current chopping. A fuel cell super cap hybrid vehicle adopting a battery system includes a motor(20), a fuel cell(10), a super cap(30), a battery(40), a DC-DC converter(66), an auxiliary machinery(60), a power distributing device, and a controller(50). The super cap charges power of the fuel cell and supplies the charged power to the motor. The auxiliary machinery receives and stores the power from the fuel cell to supply the power required for the vehicle. The power distributing device distributes the power of the fuel cell and the super cap. The DC-DC converter includes an inductor, a first switch, and a second switch. The inductor is connected to the battery. The first switch is connected between the inductor and the power distributing device. The second switch is connected between the battery and the first switch.

Description

Fuel cell super cap hybrid vehicle applied battery system and method control distributing power

1 is a configuration diagram of a power net of a fuel cell supercap hybrid vehicle to which a battery system according to an exemplary embodiment of the present invention is applied;

2 is a diagram showing a power distribution control strategy of the present invention;

3 is a flowchart illustrating a driving sequence according to a precharge start mode according to the present invention;

4 is a flowchart showing a driving sequence according to the discharge shutdown mode of the present invention;

5 is a flowchart illustrating a driving sequence according to a general shutdown mode of the present invention;

6 is a flow chart showing a driving sequence according to the fuel cell on-off of the present invention,

7 is a flowchart showing a driving sequence according to the regenerative current chopping mode of the present invention;

8 is a flowchart illustrating a driving sequence according to the battery support mode of the present invention;

9 is a current flow diagram of a power net diagram according to DC-DC converter control.

<Description of the symbols for the main parts of the drawings>

1: first relay 2: second relay

3: third relay 4: first switch

6: second switch 7: voltage divider

10 fuel cell 20 motor

30: Super Cap 40: Battery

50: controller 60: accessories

The present invention relates to a fuel cell supercap hybrid vehicle to which a battery system is applied, and a power distribution control method thereof, and more particularly, to a vehicle using a power source including a fuel cell, a supercap, and a battery, and an operation sequence of the vehicle. .

Recently, there has been a growing interest in energy supply and demand due to the depletion of fossil fuels and the development of eco-friendly energy. The fuel cell system has emerged as a substitute for the power system of cars that use fossil fuels such as petroleum and natural gas as raw materials. A fuel cell is defined as a battery having a capability of producing direct current by converting chemical energy of fuel (hydrogen) directly into electrical energy. Unlike conventional cells, fuel cells supply fuel and air from the outside to supply fuel (hydrogen) and oxygen. By using the electricity generated by the chemical reaction of the motor of the power unit.

The fuel cell supercap hybrid system directly connects the fuel cell and the supercap so that the current change of the supercap is large with respect to the fuel cell voltage change, so the supercap is responsible for most of the load change and the fuel cell is generally responsible for even output. The fuel cell supercap hybrid system is an excellent combination in that the fuel cell can be more mildly controlled, but has a disadvantage in that power distribution control cannot be actively performed. Therefore, research has been conducted to more actively control fuel cell on / off and fuel cell current by adding a power converter to the fuel cell. However, the addition of such a power converter causes energy loss as power passes through the DC-DC converter at all times, and the DC-DC converter must be enlarged to match the fuel cell output. There is a disadvantage that it can not operate various operations such as adverse effect, supercap discharge, regenerative braking current chopping.

An object of the present invention is to solve the above problems, by adding a battery system to the existing supercap hybrid system, supercap precharge control, fuel cell voltage and ON / OFF control, regenerative braking current chopping through bus stage voltage control The present invention provides a fuel cell supercap hybrid vehicle and a method of controlling power distribution thereof, to which a battery system that can facilitate control and the like is applied.

In order to achieve the above object, the fuel cell supercap hybrid vehicle to which the battery system according to an embodiment of the present invention is applied, the motor; A fuel cell supplying power to the motor; A super cap for charging power of the fuel cell and supplying charged power to the motor; A battery which supplies power for driving the motor together with the fuel cell and the super cap; A DC-DC converter connected with the battery; A bogie which receives power from the fuel cell and stores the power and supplies the power to the vehicle; A power distribution device for distributing power between the fuel cell and the super cap; And a controller for controlling switching of the DC-DC converter and the power distribution device, wherein the DC-DC converter includes an inductor connected to the battery, a first switch connected between the inductor and the power distribution device, And a second switch connected between the battery and the first switch.

The controller includes a gate driver for controlling the first switch and the second switch; And a relay driver for controlling a relay included in the power distribution device.

Power distribution control method for a fuel cell supercap hybrid vehicle to which a battery system according to an embodiment of the present invention is applied, a motor, a fuel cell for supplying power to the motor, the power of the fuel cell and charged power to the motor A super cap for supplying the battery, a battery for supplying power for driving the motor together with the fuel cell and the super cap, a DC-DC converter connected to the battery, and receiving and storing the power from the fuel cell so that the vehicle And a controller for controlling switching of the power distribution device for distributing the power of the fuel cell and the super cap, the DC-DC converter, and the power distribution device for supplying power. An inductor connected to a battery, a first switch connected between the inductor and the power distribution device, And a second switch connected between the battery and the first switch, wherein the power distribution device includes a first relay for controlling whether a bus terminal and the fuel cell are connected, and a second relay for controlling whether a bus terminal and the super cap are connected. And a third relay configured to control whether the battery is connected to the fuel cell or the bus terminal, wherein the upper limit value 1 and the upper limit value 2 determine the bus voltage limit and the fuel cell on-off. Setting an upper limit value 3 for determining the start of regeneration chopping; Performing the DC-DC converter voltage control below the lower limit; Performing the fuel cell off at the upper limit value 2; At the upper limit value 1, performing the fuel cell turn-on when the voltage of the fuel cell is equal to the bus terminal after the battery is charged; And preventing the voltage rise through regenerative braking current chopping through the battery when the upper limit value is 3 or more.

In a power distribution control method of a fuel cell supercap hybrid vehicle to which a battery system according to an exemplary embodiment of the present invention is applied, power distribution control according to precharge start may be performed by operating the fuel cell accessory power through the low voltage converter. Maintaining the fuel cell in operable condition; Turning on the first relay to connect the fuel cell and the bus terminal to enter a fuel cell only mode; Suspending a low voltage converter boost mode such that the fuel cell output is responsible for accessory; Performing voltage control such that the bus terminal voltage is equal to the fuel cell voltage through the DC-DC converter; And turning on the second relay when the voltage is the same, proceeding to a hybrid mode in which the fuel cell and the super cap are directly connected, and starting normal operation.

In a power distribution control method of a fuel cell supercap hybrid vehicle to which a battery system according to an exemplary embodiment of the present invention is applied, the discharge start-off mode may include: completely separating the bus stage and the supercap by turning off the second relay; Proceeding with the super cap discharge and the battery charging through the DC-DC converter voltage control; When the super cap discharge reaches a predetermined level, turning on the low voltage converter to take charge of the accessory before turning off the first relay; And performing the first relay off and the fuel cell shutdown.

In a power distribution control method of a fuel cell supercap hybrid vehicle to which a battery system according to an exemplary embodiment of the present invention is applied, the normal start-off mode may include: turning off the first relay to disconnect the fuel cell from the bus terminal; The super cap is responsible for the fuel cell accessory; Proceeding to shut down the fuel cell; Off the second relay to release the connection between the super cap and the bus terminal.

In a method for controlling power distribution of a fuel cell supercap hybrid vehicle to which a battery system according to an exemplary embodiment of the present invention is applied, the fuel cell on / off mode may include driving in a supercap hybrid mode; Turning off the first relay to disconnect the fuel cell from the bus terminal when the bus terminal voltage reaches an upper limit value 2 and also to turn off fuel cell side current power; Turning on the third relay when the bus stage voltage falls back to an upper limit of 1; Lowering the fuel cell voltage to the super cap voltage level through the DC-DC converter voltage control; Turning on the first relay to directly connect the fuel cell and the supercap, stop the DC-DC converter voltage control, and turn off the third relay to enter the supercap hybrid mode. .

In the method for controlling power distribution of a fuel cell supercap hybrid vehicle to which a battery system according to an exemplary embodiment of the present invention is applied, the regenerative current chopping mode may include the supercap voltage in the supercap only mode with the first relay turned off. Controlling the voltage not to exceed the upper limit 3 through the DC-DC converter buck mode control when the upper limit 3 is exceeded; And stopping the DC-DC converter control to return to the supercap only mode when the supercap voltage falls below the upper limit value 3.

In a power distribution control method of a fuel cell supercap hybrid vehicle to which a battery system according to an exemplary embodiment of the present invention is applied, a battery assist mode may include: measuring the bus stage voltage; And supporting a battery current through the DC-DC converter voltage control so that the bus terminal voltage does not fall below an upper limit of 1.

The above and other objects and features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention; First, in adding reference numerals to the components of each drawing, the same components will be given the same reference numerals as much as possible, even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a diagram showing a power net configuration of a fuel cell supercap hybrid vehicle to which the battery system of the present invention is applied.

Referring to FIG. 1, the fuel cell supercap system of the present invention may maintain the voltage of the supercap by adding a battery system to compensate for the low energy storage characteristics of the supercap. The fuel cell supercap system of the present invention generally performs load following with the fuel cell supercap hybrid system. When the supercap voltage is out of the setting range, the fuel cell supercap system performs the fuel cell output leveling. do.

To this end, the power net configuration of the fuel cell supercap system of the present invention includes a motor 20, a fuel cell 10 for supplying power to the motor 20, and a power source charged with the fuel cell 10. The battery 40 and the battery for supplying power for driving the motor 20 together with the super cap 30, the fuel cell 10, and the super cap 30 to supply the motor 20. A DC-DC converter 66 connected to the 40; an accessory 60 for supplying power required for the vehicle; a power distribution device 7 for distributing the power of the fuel cell 10 and the super cap 30; And a controller 50 for controlling the switching of the DC-DC converter 66 and the power distribution device 7. The input terminal of the motor 20 is supplied to the motor 20. It may further include an inverter 22 for converting power.

The power distribution device 7 includes a first relay 1, a second relay 2, and a third relay 3, and the first relay 1 is connected to a bus terminal and a fuel cell 10. The second relay 2 controls whether the bus terminal and the super cap 30 are connected, and the third relay 3 controls whether the battery 40 is connected to the fuel cell 10 or the bus terminal. do.

The accessory 60 is divided into a high voltage output device 64 and a low voltage output device 62. The low voltage output device 62 is operated through a low power converter 63. Power is connected to the high voltage output device 64.

The DC-DC converter 66 includes an inductor 5 connected to the battery 40, a first switch 4 connected between the inductor 5 and the third relay 3, a battery 40, and a first switch. It is comprised including the 2nd switch 6 connected between (4).

The controller 50 comprises a gate driver controlling the first switch 4 and the second switch 6 and a relay driver controlling the first to third relays 3 of the power distribution device 7. .

2 is a view showing a power distribution control strategy according to an embodiment of the present invention.

Referring to FIG. 2, the power distribution control according to the present invention operates through the control of the voltage of the battery 40 DC-DC converter 66 when the bus stage voltage drops below V _{low_limit} while operating in a fuel cell supercap hybrid system. When the bus stage voltage does not fall below V _{low_limit} and when the bus stage voltage rises above V _{high_limit2} , the power of the fuel cell 10 and its accessories 60 is turned off, thereby preventing the bus stage voltage from rising and regeneration breaking ( By preventing the super cap 30 charging by the fuel cell 10 during the regeneration braking, it is possible to improve the fuel economy by increasing the regenerative braking margin. In addition, in order to prevent chattering during the fuel cell 10 ON / OFF, the fuel cell 10 ON time starts at V _{high_limit1} and puts hysteresis at the ON / OFF time. When the bus stage voltage rises near the fuel cell OCV, the regenerative braking current chopping mode may be increased by controlling the voltage of the battery 40 DC-DC converter 66 to increase the regenerative braking energy and charge the battery 40. Prevent further voltage rise.

3 to 8 illustrate a sequence according to power distribution control according to an embodiment of the present invention.

Referring to FIG. 3, in the power distribution control according to the precharge start, the supercap is discharged at the start of the vehicle, and thus, when directly connected to the fuel cell 10, a sudden overcurrent flows and adversely affects the stack. Therefore, the fuel cell 10 is operated by the low power converter 63 to make the fuel cell 10 runable, and the first relay 1 is turned on to turn the fuel cell 10 on. Enter fuel cell only mode by connecting to bus terminal. The low power converter boost mode is stopped so that the fuel cell 10 output is responsible for the accessory 60 and the like. Voltage control is performed such that the bus terminal voltage is equal to the fuel cell 10 voltage through the DC-DC converter 66. When the voltage is the same, the second relay 2 is turned on to turn on the fuel cell 10 and the super cap 30. The hybrid mode is directly connected to the vehicle to start normal operation.

Referring to FIG. 4, when the discharge shuts down, that is, when the engine is turned off while discharging the super cap 30 voltage, the second relay 2 is turned off to completely turn off the bus terminal and the super cap 30. After the separation, the super cap 30 is discharged and the battery 40 is charged through the DC-DC converter 66 voltage control. When the discharge of the super cap 30 reaches a desired level, the first relay 1 is in a situation in which the low voltage converter 63 is turned on to take charge of the accessory 60 before the first relay 1 is turned off. Proceed OFF and shut down the fuel cell 10. This is to connect or disconnect the fuel cell 10 to the bus stage in a situation where the fuel cell accessory power is always operating.

Referring to FIG. 5, in the normal start-off mode, the first relay 1 is turned off to disconnect the fuel cell 10 from the bus terminal, and the super cap 30 is responsible for the fuel cell accessory 60. It is a situation and proceeds to shut down the fuel cell 10. Finally, the second relay 2 is turned off to disconnect the super cap 30 from the bus terminal.

Meanwhile, referring to FIG. 6, the fuel cell on / off mode performs fuel cell ON / OFF control to prevent supercap charging by the fuel cell during regenerative braking without using a low power section in consideration of fuel cell efficiency. When the bus stage voltage reaches V _{high_limit2} while operating in the supercap hybrid mode, the first relay 1 is turned off to disconnect the fuel cell 10 from the bus stage. We plan to improve fuel economy. When the bus stage voltage falls back to V _{high_limit1} , the fuel cell 10 is turned on. At this time, when the super cap 30 and the fuel cell 10 are directly connected, the overcurrent flows due to the voltage difference. In order to prevent this, a method of directly connecting the voltage of the fuel cell 10 to a level similar to that of the super cap 30 is used. In this process, when the _voltage drops to V _{high_limit1} , the third relay 3 is turned on so that the battery 40 is connected to the fuel cell 10 side only. The voltage of the fuel cell 10 is superimposed through the DC-DC converter 66 voltage control. After dropping to a level similar to that of the cap 30 voltage, the first relay 1 is turned on to directly connect the fuel cell 10 and the super cap 30 to stop the DC-DC converter 66 voltage control and the third relay. Turn off (3) to enter supercap hybrid mode.

Referring to FIG. 7, the regenerative current chopping mode prevents the bus stage voltage from dropping too much by performing battery assist in the fuel cell high power section. DC-DC Conveter Buck when the first relay 1 of the fuel cell 10 is turned off, that is, when the voltage of the super cap 30 exceeds V _{high_limit3} in the super cap 30 only mode. Mode control ensures that the voltage does not exceed the upper limit. If the voltage of the super cap 30 _falls below V _{high_limit3} again, the DC-DC converter 66 stops controlling and returns to the super cap only mode.

Referring to FIG. 8, in the battery assist mode, the regenerative braking current may be received not only in the super cap 30 but also in the battery 40, thereby increasing the regenerative braking energy to increase the braking force and the energy efficiency. The battery assist mode may improve the power performance of the vehicle by assisting the battery 40 current through the DC-DC converter 66 voltage control so that the bus terminal voltage does not fall below V _{low_limit} .

만큼 증가하고 제 2 스위치(6)를 Off할 경우

만큼 감소한다. 벅 모드(Buck Mode)는 제 1 스위치(4)를 작동시켜 같은 방법으로 제어한다. On the other hand, the DC-DC converter 66 generates the current command I_cmd through the proportional, derivative, and integral gains when the voltage command value V_cmd is determined as shown in FIG. 9, and performs IGBT duty control accordingly. For example, when the second switch 6 is turned on in the boosting mode, the current flowing in the coil is

Increment and then turn off the second switch (6)

Decreases by. Buck mode is controlled in the same way by actuating the first switch 4.

As described above, a fuel cell supercap hybrid vehicle to which a battery system according to an exemplary embodiment of the present invention is applied and a method of controlling power distribution thereof may include a battery and a battery side DC at a fuel cell side in order to more actively control the fuel cell output. By constructing a DC converter to control fuel cell output, the fuel cell can be used in the high-efficiency area at low and high fuel cell intervals. In the regenerative braking current chopping mode, the fuel cell supercap hybrid system can be operated more efficiently and actively.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the scope of the claims You will have to look.

Claims (9)

motor; A fuel cell supplying power to the motor; A super cap for charging power of the fuel cell and supplying charged power to the motor; A battery which supplies power for driving the motor together with the fuel cell and the super cap; A DC-DC converter connected with the battery; A bogie which receives power from the fuel cell and stores the power and supplies the power to the vehicle; A power distribution device for distributing power between the fuel cell and the super cap; And a controller for controlling switching of the DC-DC converter and the power distribution device. The DC-DC converter includes an inductor connected to the battery, a first switch connected between the inductor and the power distribution device, and a second switch connected between the battery and the first switch. A fuel cell supercap hybrid vehicle to which a battery system is applied. The method of claim 1, The controller A gate driver controlling the first switch and the second switch; A fuel cell supercap hybrid vehicle to which a battery system is applied, the relay driver controlling a relay included in the power distribution device. A motor, a fuel cell for supplying power to the motor, a super cap for charging the power of the fuel cell and supplying the charged power to the motor, and supplying power for driving the motor together with the fuel cell and the super cap. A battery, a DC-DC converter connected to the battery, a bogie which receives power from the fuel cell, stores power, supplies power to a vehicle, a power distribution device for distributing power between the fuel cell and the super cap; And a controller for controlling switching of the DC-DC converter and the power distribution device, wherein the DC-DC converter includes an inductor connected to the battery, a first switch connected between the inductor and the power distribution device, and the battery; And a second switch connected between the first switch, wherein the power distribution device comprises a bus terminal and the A fuel cell supercap comprising a first relay for controlling whether a fuel cell is connected, a second relay for controlling whether a bus terminal and the super cap are connected, and a third relay for controlling whether the battery is connected to the fuel cell or the bus terminal. In a hybrid vehicle, Setting an upper limit value 1, an upper limit value 2, and an upper limit value 3 for determining the start of regeneration chopping for determining the bus terminal voltage lower limit value and the fuel cell on-off; Performing the DC-DC converter voltage control below the lower limit; Performing the fuel cell off at the upper limit value 2; At the upper limit value 1, performing the fuel cell turn-on when the voltage of the fuel cell is equal to the bus terminal after the battery is charged; Preventing the voltage rise through regenerative braking current chopping through the battery when the upper limit is 3 or more. 2. The power distribution control method of a fuel cell supercap hybrid vehicle to which the battery system is applied. A motor, a fuel cell for supplying power to the motor, a super cap for charging the power of the fuel cell and supplying the charged power to the motor, and supplying power for driving the motor together with the fuel cell and the super cap. A battery, a DC-DC converter connected to the battery, a bogie which receives power from the fuel cell, stores power, supplies power to a vehicle, a power distribution device for distributing power between the fuel cell and the super cap; And a controller for controlling switching of the DC-DC converter and the power distribution device, wherein the DC-DC converter includes an inductor connected to the battery, a first switch connected between the inductor and the power distribution device, and the battery. And a second switch connected between the first switch and the power distribution device. A fuel cell super comprising a first relay for controlling whether a fuel cell is connected, a second relay for controlling whether the bus terminal and a super cap are connected, and a third relay for controlling whether the battery is connected to the fuel cell or the bus terminal. In a cab hybrid vehicle, Power distribution control according to precharge start Operating the fuel cell accessory power through the low voltage converter to maintain the fuel cell in operable condition; Turning on the first relay to connect the fuel cell and the bus terminal to enter a fuel cell only mode; Suspending a low voltage converter boost mode such that the fuel cell output is responsible for accessory; Performing voltage control such that the bus terminal voltage is equal to the fuel cell voltage through the DC-DC converter; If the voltage is the same, turning on the second relay to perform a hybrid mode in which the fuel cell and the super cap are directly connected to each other to start normal operation. Method of controlling power distribution in cab hybrid vehicle. A motor, a fuel cell for supplying power to the motor, a super cap for charging the power of the fuel cell and supplying the charged power to the motor, and supplying power for driving the motor together with the fuel cell and the super cap. A battery, a DC-DC converter connected to the battery, a bogie which receives power from the fuel cell, stores power, supplies power to a vehicle, a power distribution device for distributing power between the fuel cell and the super cap; And a controller for controlling switching of the DC-DC converter and the power distribution device, wherein the DC-DC converter includes an inductor connected to the battery, a first switch connected between the inductor and the power distribution device, and the battery; And a second switch connected between the first switch, wherein the power distribution device is connected to the bus end. A first relay controlling whether a fuel cell is connected to the fuel cell, a second relay controlling whether the bus terminal and the super cap are connected, and a third relay controlling whether the battery is connected to the fuel cell or the bus terminal. In the battery supercap hybrid vehicle, The discharge start-off mode Turning off the second relay to completely separate the bus stage and the super cap; Proceeding with the super cap discharge and the battery charging through the DC-DC converter voltage control; When the super cap discharge reaches a predetermined level, turning on the low voltage converter to take charge of the accessory before turning off the first relay; And performing the first relay off and the fuel cell shutdown. 2. The power distribution control method of a fuel cell supercap hybrid vehicle to which a battery system is applied. A motor, a fuel cell for supplying power to the motor, a super cap for charging the power of the fuel cell and supplying the charged power to the motor, and supplying power for driving the motor together with the fuel cell and the super cap. A battery, a DC-DC converter connected to the battery, a bogie which receives power from the fuel cell, stores power, supplies power to a vehicle, a power distribution device for distributing power between the fuel cell and the super cap; And a controller for controlling switching of the DC-DC converter and the power distribution device, wherein the DC-DC converter includes an inductor connected to the battery, a first switch connected between the inductor and the power distribution device, and the battery; And a second switch connected between the first switch, wherein the power distribution device is connected to the bus end. A first relay controlling whether a fuel cell is connected to the fuel cell, a second relay controlling whether the bus terminal and the super cap are connected, and a third relay controlling whether the battery is connected to the fuel cell or the bus terminal. In the battery supercap hybrid vehicle, Normal startup off mode Turning off the first relay to release the fuel cell connection to the bus terminal; The super cap is responsible for the fuel cell accessory; Proceeding to shut down the fuel cell; Turning off the second relay to disconnect the super cap and the bus terminal; and a power distribution control method of a fuel cell super cap hybrid vehicle to which a battery system is applied. A motor, a fuel cell for supplying power to the motor, a super cap for charging the power of the fuel cell and supplying the charged power to the motor, and supplying power for driving the motor together with the fuel cell and the super cap. A battery, a DC-DC converter connected to the battery, a bogie which receives power from the fuel cell, stores power, supplies power to a vehicle, a power distribution device for distributing power between the fuel cell and the super cap; And a controller for controlling switching of the DC-DC converter and the power distribution device, wherein the DC-DC converter includes an inductor connected to the battery, a first switch connected between the inductor and the power distribution device, and the battery; And a second switch connected between the first switch, wherein the power distribution device is connected to the bus end. A first relay to control whether a fuel cell is connected to the fuel cell, a second relay to control whether the bus terminal and the super cap are connected, and a third relay to control whether the battery is connected to the fuel cell or the bus terminal. In a fuel cell supercap hybrid vehicle, Fuel cell on / off mode Driving in a supercap hybrid mode; Turning off the first relay to disconnect the fuel cell from the bus terminal when the bus terminal voltage reaches an upper limit value 2 and also to turn off fuel cell side current power; Turning on the third relay when the bus stage voltage falls back to an upper limit of 1; Lowering the fuel cell voltage to the super cap voltage level through the DC-DC converter voltage control; Turning on the first relay to directly connect the fuel cell and the supercap, stop the DC-DC converter voltage control, and turn off the third relay to enter the supercap hybrid mode. A method for controlling power distribution of a fuel cell supercap hybrid vehicle to which a battery system is applied. A motor, a fuel cell for supplying power to the motor, a super cap for charging the power of the fuel cell and supplying the charged power to the motor, and supplying power for driving the motor together with the fuel cell and the super cap. A battery, a DC-DC converter connected to the battery, a bogie which receives power from the fuel cell, stores power, supplies power to a vehicle, and a power distribution device for distributing power between the fuel cell and the super cap; And a controller for controlling switching of the DC-DC converter and the power distribution device, wherein the DC-DC converter includes an inductor connected to the battery, a first switch connected between the inductor and the power distribution device, and the battery; And a second switch connected between the first switch, wherein the power distribution device is connected to the bus end. A first relay controlling whether a fuel cell is connected to the fuel cell, a second relay controlling whether the bus terminal and the super cap are connected, and a third relay controlling whether the battery is connected to the fuel cell or the bus terminal. In the battery supercap hybrid vehicle, Regenerative current chopping mode Controlling the voltage not to exceed the upper limit 3 through a DC-DC converter buck mode control when the first relay is turned off and the super cap voltage exceeds the upper limit 3 in the super cap only mode; Stopping the DC-DC converter control and returning to the supercap only mode when the supercap voltage falls below the upper limit value 3; power distribution of the fuel cell supercap hybrid vehicle to which the battery system is applied. Control method. A motor, a fuel cell for supplying power to the motor, a super cap for charging the power of the fuel cell and supplying the charged power to the motor, and supplying power for driving the motor together with the fuel cell and the super cap. A battery, a DC-DC converter connected to the battery, a bogie which receives power from the fuel cell, stores power, supplies power to a vehicle, a power distribution device for distributing power between the fuel cell and the super cap; And a controller for controlling switching of the DC-DC converter and the power distribution device, wherein the DC-DC converter includes an inductor connected to the battery, a first switch connected between the inductor and the power distribution device, and the battery; And a second switch connected between the first switch, wherein the power distribution device is connected to the bus end. A first relay controlling whether a fuel cell is connected to the fuel cell, a second relay controlling whether the bus terminal and the super cap are connected, and a third relay controlling whether the battery is connected to the fuel cell or the bus terminal. In the battery supercap hybrid vehicle, Battery assist mode Measuring the bus stage voltage; A method of controlling power distribution of a fuel cell supercap hybrid vehicle to which a battery system is applied, comprising: supporting a battery current by controlling the DC-DC converter voltage so that the bus terminal voltage does not fall below an upper limit of 1. .

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