KR20200072200A - Control method for supplying hydrogen to fuel cell - Google Patents

Abstract

Introduced is a method for controlling supply of hydrogen to a fuel cell, by controlling a system for supplying hydrogen from a hydrogen supply device to a fuel cell stack, the method comprising: a step of driving a first compressor located in a hydrogen supply line connected to the fuel cell stack from the hydrogen supply device; a step of compressing hydrogen such that a front end pressure or a rear end pressure of the hydrogen supply line satisfies a preset pressure condition as the first compressor is driven; and a step of driving a second compressor connected in parallel to the first compressor through the hydrogen supply line while having an allowable flow rate of an allowable flow rate of the first compressor if the flow rate of hydrogen of the hydrogen supply device increases. Accordingly, a constant pressure of hydrogen can be provided in response to the flow rate of hydrogen.

Description

CONTROL METHOD FOR SUPPLYING HYDROGEN TO FUEL CELL

The present invention relates to a method for controlling hydrogen supply in a fuel cell, and more particularly, to a technology for supplying hydrogen from a fuel reformer to a fuel cell stack by pressing.

A fuel cell is an energy converter that converts chemical energy possessed by fuel into electric energy by electrochemically reacting without converting it to heat by combustion, as well as supplying electric power for industrial, household, and automotive use, as well as small electric/electronic products and portable devices. It can also be used to supply power.

In particular, in the polymer electrolyte membrane fuel cell (PEMFC: Polymer Electrolyte Membrane Fuel Cell) having a high power density, a membrane electrode assembly (MEA: Membrane-Electrode Assembly), which is a main component, is located inside, and the membrane electrode assembly contains hydrogen ions. It consists of a solid polymer electrolyte membrane that can be moved, and a cathode and an anode, which are electrode layers coated with a catalyst so that hydrogen and oxygen can react on both sides of the electrolyte membrane.

The fuel cell may supply industrial or household power in a building or the like, or may be mounted on a vehicle to supply driving power. In particular, the fuel cell for power generation installed in buildings, etc., is a fuel reformer that is a device that chemically converts hydrogen-containing hydrocarbon fuel (LPG, LNG, methane, coal gas methanol, etc.) into a gas containing much hydrogen required by the fuel cell ( Fuel Reformer).

In particular, the fuel reformer can supply hydrogen through four stages such as sulfur removal, fuel reforming, aqueous reaction, and carbon monoxide removal. However, the pressure of hydrogen supplied from the fuel reformer is lower than the pressure of hydrogen required by the fuel cell stack, which requires the configuration of an additional compressor. However, the compressor has a problem in that it cannot respond appropriately when the hydrogen flow rate of the fuel reformer is variable due to a narrow controllable flow rate range.

The above descriptions as background arts are only for improving understanding of the background of the present invention, and should not be accepted as acknowledging that they correspond to the prior arts already known to those skilled in the art.

KR 10-2000-0018557 A

The present invention has been proposed to solve this problem, and a hydrogen supply control method capable of supplying hydrogen to the fuel cell stack at a constant hydrogen pressure in response to a variable hydrogen flow rate of a hydrogen supply device that supplies hydrogen at a constant hydrogen pressure. To provide.

The hydrogen supply control method of a fuel cell according to the present invention for achieving the above object is a method of controlling a system for supplying hydrogen from a hydrogen supply device to a fuel cell stack, wherein the hydrogen supply device is connected to the fuel cell stack to supply hydrogen Driving a first compressor located on the line; Pressurizing hydrogen such that the front pressure or the rear pressure of the hydrogen supply line satisfies a predetermined pressure condition as the first compressor is driven; And when the hydrogen flow rate of the hydrogen supply device increases, driving a second compressor connected to the hydrogen supply line in parallel with the first compressor while having an allowable flow rate equal to or greater than the allowable flow rate of the first compressor.

The hydrogen supply device may be a fuel reformer that supplies hydrogen in a state where the hydrogen supply pressure is kept constant.

In the step of driving the first compressor, the first compressor is driven with the outlet valve positioned between the hydrogen supply line and the fuel cell stack blocked, and in the step of pressurizing hydrogen, the front pressure or the rear pressure of the hydrogen supply line is When hydrogen is pressurized to satisfy a predetermined pressure condition of, the outlet valve may be opened.

In the step of pressurizing hydrogen, hydrogen can be pressurized with the control valve located in the bypass line bypassing the first compressor and the second compressor in the hydrogen supply line until the outlet valve is opened.

In the step of pressurizing the hydrogen, after opening the outlet valve, the control valve located in the bypass line bypassing the first compressor and the second compressor in the hydrogen supply line is blocked, and based on the hydrogen flow rate of the hydrogen supply device. The rotational speed of the first compressor can be controlled.

In the step of driving the second compressor, before the hydrogen flow rate of the hydrogen supply device increases, while controlling the second compressor to be driven at the minimum rotational speed, the predetermined pressure condition of the front pressure or the rear pressure of the hydrogen supply line is satisfied. So that the opening degree of the control valve can be controlled.

In the step of driving the second compressor, when the hydrogen flow rate of the hydrogen supply device increases, it is possible to control the rotation speed of the second compressor based on the hydrogen flow rate of the hydrogen supply device while controlling to close the control valve.

After the step of driving the second compressor, if the hydrogen flow rate of the hydrogen supply device decreases, reducing the rotational speed of the first compressor or the second compressor; may further include a.

In the step of reducing the rotational speed of the first compressor or the second compressor, if the rotational speed of the first compressor and the second compressor is reduced to the minimum rotational speed, increasing the rotational speed of the second compressor while opening the control valve; And stopping the driving of the first compressor and reducing the rotational speed of the second compressor while shutting off the control valve.

In the step of reducing the rotational speed of the second compressor, if the rotational speed of the second compressor is reduced to the minimum rotational speed, driving the first compressor while opening the control valve; And stopping the driving of the second compressor, and reducing the rotational speed of the first compressor while shutting off the control valve.

After the step of driving the second compressor, when the hydrogen supply of the hydrogen supply device is stopped, opening the control valve while closing the outlet valve located between the hydrogen supply line and the fuel cell stack; may further include a.

After the step of opening the control valve while closing the outlet valve, after stopping the driving of the first compressor, stopping the driving of the second compressor; may further include.

According to the hydrogen supply control method of the fuel cell of the present invention, it has an effect of expanding a range of controllable hydrogen flow rates by selectively driving a plurality of compressors connected in parallel.

In addition, by controlling the control valve together with the rotational speeds of the first compressor and the second compressor, it has an effect that the controllable flow range can be further expanded while securing the speed of flow control.

1 illustrates a system for supplying hydrogen from a hydrogen supply device to a fuel cell stack according to an embodiment of the present invention.
2 is a flowchart of a method for controlling hydrogen supply in a fuel cell according to an embodiment of the present invention.

Specific structural or functional descriptions with respect to the embodiments of the present invention disclosed in the present specification or the application are exemplified for the purpose of illustrating the embodiments according to the present invention, and the embodiments according to the present invention may be implemented in various forms. And may not be construed as limited to the embodiments described in this specification or application.

Since the embodiment according to the present invention can be applied to various changes and can have various forms, specific embodiments will be illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiment according to the concept of the present invention to a specific disclosure form, and it should be understood to include all modifications, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms such as first and/or second may be used to describe various components, but the components should not be limited by the terms. The above terms are only for the purpose of distinguishing one component from another component, for example, without departing from the scope of rights according to the concept of the present invention, the first component may be referred to as the second component, and similarly The second component may also be referred to as the first component.

When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but there may be other components in between. It should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle. Other expressions that describe the relationship between the components, such as "between" and "immediately between" or "neighboring" and "directly neighboring to" should be interpreted as well.

The terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “include” or “have” are intended to indicate that a feature, number, step, action, component, part, or combination thereof described is present, and one or more other features or numbers. It should be understood that it does not preclude the existence or addability of, steps, actions, components, parts or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms such as those defined in a commonly used dictionary should be interpreted as meanings consistent with meanings in the context of related technologies, and are not to be interpreted as ideal or excessively formal meanings unless explicitly defined herein. .

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. The same reference numerals in each drawing denote the same members.

1 illustrates a system for supplying hydrogen from a hydrogen supply device 10 to a fuel cell stack 20 according to an embodiment of the present invention.

Referring to FIG. 1, the hydrogen supply device 10 may be a fuel reformer (Fuel Reformer) that reforms hydrogen gas from hydrocarbon fuels such as coal, bioethanol, as well as natural gas, methanol, kerosene, and diesel.

Hydrogen supplied from the hydrogen supply device 10 may flow along the hydrogen supply line 50 and be supplied to the fuel cell stack 20. A buffer tank 40 for storing hydrogen may be further included between the hydrogen supply device 10 and the fuel cell stack 20 to immediately change the flow rate of hydrogen supplied to the fuel cell stack 20. .

The hydrogen supply line 50 between the hydrogen supply device 10 and the fuel cell stack 20 may further include a compressor that compresses hydrogen supplied from the hydrogen supply device 10. In the compressor, a plurality of compressors having the same or different allowable flow rates may be connected in parallel. Accordingly, the compressors 51 and 52 may be selectively driven according to the flow rate of hydrogen supplied from the hydrogen supply device 10.

As shown in the drawing, the compressors 51 and 52 are parallel to the first compressor 51 having a relatively small allowable flow rate and the second compressor 52 having the same or greater than the allowable flow rate of the first compressor 51. It can be included as The pressure range of the first compressor 51 and the second compressor 52 is the same, and only the capacity may be different.

The permissible flow rate may range between the minimum flow rate flowing at the minimum rotational speed of each compressor and the maximum flow rate flowing at the maximum. The allowable flow rate of the first compressor 51 and the allowable flow rate of the second compressor 52 may partially or entirely overlap, and the second compressor 52 may have a maximum flow rate greater than the maximum flow rate of the first compressor 51. Can be.

The first compressor 51 and the second compressor 52 have a difference between the pressure of hydrogen supplied from the hydrogen supply device 10 and the pressure required by the fuel cell stack 20 to increase the pressure of hydrogen. Is required.

The rotation speed control of the first compressor 51 and the second compressor 52 is high in accuracy, but the range of the flow rate that can be controlled is relatively narrow. Accordingly, by configuring a plurality of compressors in parallel, the flow rate range according to the control of the rotational speed is extended.

The hydrogen supply line 50 includes a bypass line 60 for bypassing the first compressor 51 and the second compressor 52, and a control valve 61 may be located in the bypass line 60. have. Hydrogen supplied through the hydrogen supply line 50 by the first compressor 51 or the second compressor 52 is again connected to the first compressor 51 or the second compressor 52 by the bypass line 60. It may be reversed to the front end, and the control valve 61 may block or allow the flow of hydrogen to be reversed along the bypass line 60 according to opening and closing.

In the case of the control valve 61, the range of the flow rate that can be controlled is relatively wide, and the reaction speed is high by reacting immediately, but the accuracy is low. Accordingly, by controlling the control valve 61 together with the rotational speeds of the first compressor 51 and the second compressor 52, it is possible to extend the speed of flow control and the controllable flow range.

The hydrogen supply line 50 may be provided with an inlet valve 71 on the hydrogen supply device 10 side of the compressor, and an outlet valve 72 on the fuel cell stack 20 side of the compressor. . The inlet valve 71 and the outlet valve 72 may remain blocked when hydrogen is not supplied from the hydrogen supply device 10.

In addition, the hydrogen supply line 50 is provided with a first pressure sensor 81 and a second pressure sensor 82 respectively on the hydrogen supply device 10, which is the front end of the compressor, and on the fuel cell stack 20, which is the rear end of the compressor. Can be. The first pressure sensor 81 may measure the hydrogen pressure at the front end of the compressor, and the second pressure sensor 82 may measure the hydrogen pressure at the rear end of the compressor.

In addition, a flow sensor 90 for measuring the flow rate of hydrogen at the front end or the rear end of the compressors 51 and 52 may be further included. In addition, a temperature sensor (not shown) for measuring the temperature of hydrogen may be further included in the rear stage of the compressor, and accordingly, the temperature of hydrogen compressed by the compressors 51 and 52 may be measured to control hydrogen from overheating. .

The controller 30 receives the pressure, flow rate, or temperature measured from the first pressure sensor 81, the second pressure sensor 82, the flow sensor 90, and the temperature sensor (not shown), and the first compressor 51 ), the opening degree of the second compressor 52 and the control valve 61 can be controlled. In particular, the controller 30 may control to maintain a constant hydrogen supply pressure toward the fuel cell stack 20 when the hydrogen flow rate of the fuel reformer that supplies hydrogen is varied while maintaining the hydrogen supply pressure constant. .

The specific control method will be described below.

2 is a flowchart of a method for controlling hydrogen supply in a fuel cell according to an embodiment of the present invention.

Referring to FIG. 2, in a method of controlling a system for supplying hydrogen from a hydrogen supply device to a fuel cell stack according to an embodiment of the present invention, a product located in a hydrogen supply line connected to a fuel cell stack from a hydrogen supply device Driving a compressor (S100); Pressing the hydrogen so that the front pressure or the rear pressure of the hydrogen supply line satisfies a predetermined pressure condition as the first compressor is driven (S200); And when the hydrogen flow rate of the hydrogen supply device increases (S310), driving a second compressor connected in parallel with the first compressor to the hydrogen supply line while having an allowable flow rate equal to or greater than the allowable flow rate of the first compressor (S320); do.

Accordingly, as each of the first compressors and the second compressors positioned in parallel in the hydrogen supply line is sequentially driven according to the hydrogen flow rate of the hydrogen supply device, the hydrogen flow rate of the hydrogen supply device is actively responded to the allowable flow rate. It has the effect of expanding the range. Also, as the compressor is selectively driven, power consumed by the compressor is reduced.

The hydrogen supply device may be a fuel reformer that supplies hydrogen in a state where the hydrogen supply pressure is kept constant. That is, the hydrogen supply device is supplied with a constant hydrogen supply pressure and only the hydrogen flow rate is varied.

In the case of the initial supply of hydrogen from the hydrogen supply device, the first compressor having a relatively small allowable flow rate may be driven first.

Specifically, in step S100 of driving the first compressor, the first compressor may be driven with the outlet valve positioned between the hydrogen supply line and the fuel cell stack blocked. Since the hydrogen pressure in the hydrogen supply line does not satisfy the hydrogen pressure required in the fuel cell stack, the outlet valve may be blocked to drive the first compressor without supplying hydrogen to the fuel cell stack. The first compressor may be controlled to start driving at the minimum rotational speed and gradually increase the rotational speed.

In the step of pressurizing hydrogen (S200), when hydrogen is pressurized such that the front pressure or the rear pressure of the hydrogen supply line satisfies a predetermined pressure condition, the outlet valve may be opened. That is, when the first compressor is not sufficiently driven and the front pressure or the rear pressure of the hydrogen supply line does not satisfy a predetermined pressure condition, hydrogen may be pressurized without opening the outlet valve.

In the step of pressurizing hydrogen (S200), hydrogen can be pressurized with the control valve located in the bypass line bypassing the first compressor and the second compressor in the hydrogen supply line until the outlet valve is opened. .

Since the hydrogen cannot be supplied from the rear end of the first compressor to the fuel cell stack until the outlet valve is opened, the control valve is opened so that the hydrogen at the rear end of the first compressor flows back through the bypass line to the front end of the first compressor. Can be. Accordingly, hydrogen can be circulated through the hydrogen supply line and the bypass line.

In the step of pressurizing hydrogen (S200), after opening the outlet valve, the control valve located in the bypass line bypassing the first compressor and the second compressor in the hydrogen supply line is blocked, and the hydrogen flow rate of the hydrogen supply device. Based on the can control the rotational speed of the first compressor.

When the outlet valve is opened, hydrogen from the hydrogen supply line is discharged to the fuel cell stack side. That is, since the hydrogen does not need to flow back to the front end of the first compressor through the bypass line, the opening degree can be controlled to shut off the control valve of the bypass line.

At the same time, the rotational speed of the first compressor can be controlled according to the hydrogen flow rate of the hydrogen supply device. The rotation speed of the first compressor can be controlled to increase as the hydrogen flow rate increases. In particular, it is possible to control so that the front pressure or the rear pressure of the hydrogen supply line satisfies a predetermined pressure condition.

Before the step of driving the second compressor (S320), it may further include the step of determining whether the driving of the second compressor (S310). In the step of determining whether driving of the second compressor is required, when the hydrogen flow rate of the hydrogen supply device exceeds the allowable flow rate of the first compressor, the second compressor may be additionally driven.

In the step of driving the second compressor (S320), before the hydrogen flow rate of the hydrogen supply device is increased, while controlling the second compressor to be driven at the minimum rotational speed, a pressure condition in which the front pressure or the rear pressure of the hydrogen supply line is preset. The opening degree of the control valve can be controlled to satisfy.

If the hydrogen flow rate of the hydrogen supply device is expected to increase, the second compressor can be started. First, it can be controlled to drive the second compressor at the minimum rotational speed. In addition, by opening the control valve in the blocked state at the same time, it is possible to control the opening degree of the control valve so that the pressure at the front end or the rear end of the hydrogen supply line is satisfied with a predetermined pressure condition. Accordingly, an increase in the hydrogen flow rate of the hydrogen supply device can be prepared.

In addition, in the step S320 of driving the second compressor, when the hydrogen flow rate of the hydrogen supply device increases, the rotation speed of the second compressor can be controlled based on the hydrogen flow rate of the hydrogen supply device while controlling to shut off the control valve. have.

That is, as the hydrogen flow rate of the hydrogen supply device gradually increases, it is possible to control the control valve to be gradually blocked so that the pressure at the front end or the rear end of the hydrogen supply line maintains a predetermined pressure condition. At the same time, the rotation speed of the second compressor can be controlled to increase as the hydrogen flow rate of the hydrogen supply device increases.

Conversely, when the hydrogen flow rate of the hydrogen supply device decreases, the rotation speeds of the first compressor and the second compressor can be controlled to decrease.

That is, after the step S320 of driving the second compressor, if the hydrogen flow rate of the hydrogen supply device decreases, the step of reducing the rotational speed of the first compressor or the second compressor (S400); may further include a.

Specifically, when the amount of decrease in the hydrogen flow rate is relatively small, the rotational speed of the first compressor may be reduced, and when the amount of hydrogen flow reduction is relatively large, the rotational speed of the second compressor may be reduced. In particular, when the reduction amount of the hydrogen flow rate is relatively larger, it is possible to reduce both the rotational speed of the first compressor and the second compressor. The rotational speed of the first compressor or the second compressor can be reduced to the respective minimum rotational speed.

In the step (S400) of reducing the rotational speed of the first compressor or the second compressor, when the rotational speeds of the first compressor and the second compressor are reduced to the minimum rotational speed (S510), the rotation of the second compressor while opening the control valve Increasing the speed (S520); And stopping the driving of the first compressor and reducing the rotation speed of the second compressor while blocking the control valve (S530).

That is, when the hydrogen flow rate of the hydrogen supply device is smaller than the flow rates of the first compressor and the second compressor in a state in which the rotational speeds of the first compressor and the second compressor are both the minimum rotational speed, among the first compressor and the second compressor At least one can be controlled to stop driving.

Specifically, before stopping the operation of the first compressor (S530), the rotational speed of the second compressor is opened while the control valve is opened to maintain a condition in which the front pressure or the rear pressure of the hydrogen supply line satisfies a predetermined pressure condition. It can be increased (S520). The amount of increase in the rotational speed of the second compressor may be set to further discharge the flow rate according to the minimum rotational speed of the first compressor.

Thereafter, the driving of the first compressor may be stopped, and the rotation speed of the second compressor may be reduced while the control valve is blocked (S530). After stopping the operation of the first compressor, the control valve can be gradually blocked while maintaining the condition in which the front pressure or the rear pressure of the hydrogen supply line satisfies a predetermined pressure condition, and at the same time, the rotation speed of the second compressor can be gradually reduced. . The rotation speed of the second compressor can be controlled according to the hydrogen flow rate of the hydrogen supply device.

In the step of reducing the rotational speed of the second compressor (S530), when the rotational speed of the second compressor is reduced to the minimum rotational speed (S610), driving the first compressor while opening the control valve (S620); And stopping the driving of the second compressor and reducing the rotational speed of the first compressor while blocking the control valve (S630).

In the state in which only the second compressor is driven after stopping the driving of the first compressor, the rotational speed of the second compressor can be controlled according to the hydrogen flow rate of the hydrogen supply device. However, when the hydrogen flow rate of the hydrogen supply device is smaller than the flow rate in a state in which the rotation speed of the second compressor is reduced to the minimum rotation speed, it can be controlled to drive only the first compressor having a relatively small allowable flow rate instead of the second compressor. have.

Specifically, the first compressor may be driven while the control valve is opened so that a state in which the front pressure or the rear pressure of the hydrogen supply line satisfies a predetermined pressure condition. Here, the rotation speed of the first compressor can be controlled to compress the flow rate equal to or greater than the flow rate at the minimum rotation speed of the second compressor.

When the driving of the first compressor is completed (S620), the driving of the second compressor is stopped and the rotation speed of the first compressor can be controlled while the control valve is blocked. It can be controlled to reduce the rotational speed of the first compressor while gradually closing the control valve (S630). The rotation speed of the first compressor can be controlled according to the hydrogen flow rate of the hydrogen supply device.

After the step of driving the second compressor (S320), when the hydrogen supply of the hydrogen supply device is stopped (S710), opening the control valve while blocking the outlet valve located between the hydrogen supply line and the fuel cell stack (S720) ); may be further included.

When the hydrogen supply of the hydrogen supply device is suddenly stopped, it is necessary to urgently control the pressure for supplying hydrogen. Accordingly, the outlet valve located between the hydrogen supply line and the fuel cell stack can be shut off. Since the driving of the first compressor and the second compressor cannot be immediately terminated, when hydrogen is suddenly stopped from the hydrogen supply device, the outlet valve can be shut off.

In addition, by simultaneously opening the control valve and allowing the reverse flow of hydrogen to the bypass line, it is possible to secure a time to stop the operation of the first compressor and the second compressor.

After the step of opening the control valve while blocking the outlet valve (S720), after stopping the operation of the first compressor (S730) to stop the operation of the second compressor; may further include. That is, as opposed to the initial driving, the first compressor having a relatively small allowable flow rate may be stopped first, and then the second compressor may be stopped. Accordingly, when the hydrogen supply of the hydrogen supply device is resumed, it is possible to control the supply of hydrogen back to the fuel cell stack quickly.

When the hydrogen supply of the hydrogen supply device is completely blocked, after the operation of the first compressor and the second compressor is stopped, the inlet valve may also be controlled to be blocked.

Although illustrated and described in connection with specific embodiments of the present invention, it is understood in the art that the present invention may be variously improved and changed within the limits that do not depart from the technical spirit of the present invention provided by the following claims. It will be obvious to those of ordinary skill.

10: hydrogen supply device 20: fuel cell stack
30: controller 40: buffer tank
50: hydrogen supply line
51: first compressor 52: second compressor
60: bypass line 61: control valve
71: inlet valve 72: outlet valve
81: first pressure sensor 82: second pressure sensor
90: flow sensor

Claims (12)

A method of controlling a system for supplying hydrogen from a hydrogen supply device to a fuel cell stack,
Driving a first compressor located in a hydrogen supply line connected to a fuel cell stack from a hydrogen supply device;
Pressurizing hydrogen such that the front pressure or the rear pressure of the hydrogen supply line satisfies a predetermined pressure condition as the first compressor is driven; And
When the hydrogen flow rate of the hydrogen supply device increases, driving a second compressor connected to the hydrogen supply line in parallel with the first compressor while having an allowable flow rate greater than or equal to the allowable flow rate of the first compressor; Way. The method according to claim 1,
The hydrogen supply device is a fuel reformer for supplying hydrogen in a state where the hydrogen supply pressure is kept constant, and the hydrogen supply control method of the fuel cell. The method according to claim 1,
In the step of driving the first compressor, the first compressor is driven while the outlet valve located between the hydrogen supply line and the fuel cell stack is blocked,
In the step of pressurizing hydrogen, when the hydrogen is pressurized to satisfy a predetermined pressure condition of a front pressure or a rear pressure of the hydrogen supply line, the outlet valve is opened. The method according to claim 3,
In the step of pressurizing hydrogen, fuel characterized by pressurizing hydrogen with the control valve located in the bypass line bypassing the first compressor and the second compressor in the hydrogen supply line until the outlet valve is opened. Method for controlling hydrogen supply of battery. The method according to claim 3,
In the step of pressurizing the hydrogen, after opening the outlet valve, the control valve located in the bypass line bypassing the first compressor and the second compressor in the hydrogen supply line is blocked, and based on the hydrogen flow rate of the hydrogen supply device. A control method for supplying hydrogen to a fuel cell, characterized by controlling the rotational speed of the first compressor. The method according to claim 1,
In the step of driving the second compressor, before the hydrogen flow rate of the hydrogen supply device increases, while controlling the second compressor to be driven at the minimum rotational speed, the predetermined pressure condition of the front pressure or the rear pressure of the hydrogen supply line is satisfied. Hydrogen supply control method of the fuel cell, characterized in that to control the opening degree of the control valve. The method according to claim 6,
In the step of driving the second compressor, when the hydrogen flow rate of the hydrogen supply device increases, the fuel cell is characterized in that the control of the control valve to be blocked while controlling the rotation speed of the second compressor based on the hydrogen flow rate of the hydrogen supply device. Hydrogen supply control method. The method according to claim 1,
After the step of driving the second compressor, when the hydrogen flow rate of the hydrogen supply device decreases, the step of reducing the rotational speed of the first compressor or the second compressor; further comprising a method for controlling hydrogen supply of a fuel cell . The method according to claim 8,
In the step of reducing the rotational speed of the first compressor or the second compressor, if the rotational speed of the first compressor and the second compressor is reduced to the minimum rotational speed,
Increasing the rotational speed of the second compressor while opening the control valve; And
And stopping the driving of the first compressor and reducing the rotational speed of the second compressor while shutting off the control valve. The method according to claim 9,
In the step of reducing the rotational speed of the second compressor, if the rotational speed of the second compressor is reduced to the minimum rotational speed,
Driving the first compressor while opening the control valve; And
And stopping the driving of the second compressor and reducing the rotational speed of the first compressor while blocking the control valve. The method according to claim 1,
After the step of driving the second compressor, when the hydrogen supply of the hydrogen supply device is stopped, opening the control valve while blocking the outlet valve located between the hydrogen supply line and the fuel cell stack; characterized in that it further comprises a A method for controlling hydrogen supply in a fuel cell. The method according to claim 11,
After the step of opening the control valve while closing the outlet valve, stopping the operation of the second compressor after stopping the operation of the first compressor; hydrogen supply control method of a fuel cell further comprising a.

Images