KR102221208B1 - Apparatus and method for measuring an average power of fuel cell - Google Patents

Abstract

Disclosed are a fuel battery cell average power measuring device and a method thereof. According to one aspect of the present invention, the fuel battery cell average power measuring device comprises: a voltage measuring unit which sequentially measures a forward voltage from the lowest unit cell to the highest unit cell among unit cells constituting the fuel cell stack, and sequentially measures a reverse voltage from the highest unit cell to the lowest unit cell; a current measuring unit which measures a current of an output terminal of the fuel cell stack; and a control unit which controls the voltage measuring unit to measure the reverse voltage based on the current measurement time, after the forward voltage measurement of the voltage measuring unit is completed, and calculates the average power by using the forward voltage, the reverse voltage, and the measured current.

Description

Fuel cell average power measurement device and method {APPARATUS AND METHOD FOR MEASURING AN AVERAGE POWER OF FUEL CELL}

The present invention relates to an apparatus and method for measuring average power of a fuel cell, and more particularly, a fuel capable of accurately calculating the average power of a fuel cell stack by synchronizing the voltage measurement time and the current measurement time of a fuel cell stack. It relates to an apparatus and method for measuring average power of a battery cell.

A fuel cell is a type of power generation device that converts chemical energy of fuel into electrical energy by reacting electrochemically within the stack without converting it into heat by combustion. It can also be applied to power electronics, especially portable devices.

Currently, the type of polymer electrolyte membrane fuel cell (PEMFC: Polymer Electrolyte Membrane Fuel Cell, Proton Exchange Membrane Fuel Cell), which has the highest power density among fuel cells, is being studied the most as a power supply source for driving a vehicle, which is a low operating temperature. It has a fast start-up time and a fast power conversion response time.

Such a polymer electrolyte membrane fuel cell is a membrane electrode assembly (MEA: Membrane Electrode Assembly) in which an electrochemical reaction occurs on both sides of the membrane centered on a solid polymer electrolyte membrane in which hydrogen ions move, and the reaction gases are evenly distributed and generated. A gas diffusion layer (GDL) that transfers electric energy, a gasket and fastener to maintain the airtightness and proper fastening pressure of the reaction gases and cooling water, and a separator that moves the reaction gases and cooling water. It is composed of (Bipolar Plate).

When assembling a fuel cell stack using such a unit cell configuration, a combination of a membrane electrode assembly and a gas diffusion layer, which are major components, is located at the innermost part of the cell, and the membrane electrode assembly allows hydrogen and oxygen to react on both sides of the polymer electrolyte membrane. The catalyst has a catalyst electrode layer, that is, an anode and a cathode, and a gas diffusion layer, a gasket, and the like are stacked on the outer portion where the anode and the cathode are located.

On the outside of the gas diffusion layer, a separation plate is provided in which a flow field through which reaction gas (hydrogen as fuel and oxygen or air as an oxidizing agent) is supplied and cooling water passes is formed.

With this configuration as a unit cell, a plurality of unit cells are stacked, and then a current collector, an insulating plate, and an end plate for supporting the stacked cells are connected to the outermost side, and the unit cells are repeated between the end plates. By stacking and fastening, a fuel cell stack is formed.

In order to obtain a potential required in an actual vehicle, the unit cells must be stacked as much as the required potential, and the stacking unit cells is a stack. The potential generated by one unit cell is about 1.3V, and a plurality of cells are stacked in series to generate power required for driving a vehicle. Since such a fuel cell has a large voltage variability, it is necessary to accurately measure the voltage of the fuel cell in order to accurately calculate the power of the fuel cell.

However, conventionally, voltages of all unit cells of a fuel cell stack are sequentially measured, and current is measured at the end. Since the voltage measurement time and the current measurement time are different, accurate power calculation was not possible. This can cause damage to the fuel cell by making it difficult to accurately diagnose and take measures for the fuel cell with high volatility.

The background technology of the present invention is disclosed in Korean Patent Publication No. 10-1629579 (announced on June 13, 2016) in'Method for measuring a voltage of a fuel cell stack and an apparatus for performing the same.'

The present invention was conceived to improve the above problems, and an object according to an aspect of the present invention is to synchronize the voltage measurement time point of the fuel cell stack and the current measurement time point, and thereby accurately calculate the average power of the fuel cell stack. It is to provide an apparatus and method for measuring average power of a fuel cell cell capable of.

The problem to be solved by the present invention is not limited to the problem(s) mentioned above, and another problem(s) not mentioned will be clearly understood by those skilled in the art from the following description.

In the fuel cell average power measurement apparatus according to an aspect of the present invention, a forward voltage is sequentially measured from a lowest unit cell to a highest unit cell among unit cells constituting a fuel cell stack, and the highest unit cell to the lowest unit cell A voltage measurement unit that sequentially measures a reverse voltage to, a current measurement unit that measures the current at the output terminal of the fuel cell stack, and after the forward voltage measurement of the voltage measurement unit is completed, the voltage measurement unit is a reverse voltage based on the current measurement time point. And a controller configured to measure an average power using the forward voltage, the reverse voltage, and the measured current.

In the present invention, the voltage measuring unit includes a voltage measuring device for measuring a voltage for each unit cell, a mux for sequentially outputting the voltage measured for each unit cell by the voltage measuring device, and a digital voltage for each unit cell output from the mux. It may include an ADC that converts to a signal.

In the present invention, the voltage meter includes at least one voltage sensor installed in a one-to-one correspondence to each of the unit cells to sense a voltage for each unit cell, a switch electrically connecting the unit cell to the voltage sensor, and switching of the switch It may include a replica unit for measuring the noise voltage according to the operation.

In the present invention, the voltage measurement unit may further include an amplifier unit that subtracts the noise voltage measured by the replica unit from the voltage measured by the voltage sensor.

In the present invention, the voltage measurement unit may further include a level shifter that level-shifts the voltage of each unit cell measured by the voltage meter into an operable withstand voltage range and provides the voltage to the mux.

In the present invention, the voltage measuring unit may further include a scaler for downscaling the voltage measured for each unit cell by the voltage meter.

In the present invention, the controller may calculate an average of the forward voltage and the reverse voltage, and calculate the average power by multiplying the calculated average voltage and the measured current.

In the present invention, the controller may compare the average power with the instantaneous power of each unit cell, and detect an abnormal operation of the corresponding unit cell when an error equal to or greater than a preset threshold occurs as a result of the comparison.

In the present invention, the control unit may calculate the instantaneous power of each unit cell by using the voltage of the unit cell measured by the voltage measuring unit and the current measured by the current measuring unit.

A method of measuring average power of a fuel cell according to another aspect of the present invention includes the steps of sequentially measuring a forward voltage from the lowest unit cell to the highest unit cell among unit cells constituting the fuel cell stack by a voltage measurement unit, and the current measurement unit Measuring the current at the output terminal of the battery stack, the voltage measuring unit sequentially measuring a reverse voltage from the uppermost unit cell to the lowermost unit cell, the control unit calculating an average of the forward voltage and the reverse voltage, and the calculation And calculating the average power of the fuel cell stack using the measured average voltage and the measured current.

In the present invention, in the step of calculating the average power of the fuel cell stack, the control unit may calculate the average power by multiplying the average voltage and the measured current.

In the present invention, after the step of calculating the average power of the fuel cell stack, the control unit compares the average power with the instantaneous power of each unit cell, and when an error of more than a preset threshold occurs as a result of the comparison, the corresponding unit It may further include detecting an abnormal operation of the cell.

In the fuel cell average power measurement apparatus and method according to an embodiment of the present invention, forward voltage is sequentially measured from the lowest unit cell to the highest unit cell of the fuel cell stack, and from the highest unit cell to the lowest unit based on a current measurement time point. By sequentially measuring the reverse voltage up to the cell and then calculating the average voltage of the forward voltage and the reverse voltage, the effect of measuring all cell voltages at the time of current measurement can be obtained.

Furthermore, the average power of the fuel cell stack can be accurately calculated by synchronizing the voltage measurement time point and the current measurement time point of the fuel cell stack. This makes it possible to accurately diagnose and measure the state of the fuel cell with high variability, thereby preventing damage to the fuel cell.

Meanwhile, the effects of the present invention are not limited to the above-mentioned effects, and various effects may be included within a range that is apparent to a person skilled in the art from the contents to be described below.

1 is a block diagram of an apparatus for measuring average power of a fuel cell cell according to an exemplary embodiment of the present invention.
2 is a block diagram illustrating a voltage measuring unit according to an embodiment of the present invention.
3 is a flowchart illustrating a method of measuring average power of a fuel cell cell according to an embodiment of the present invention.
4 is a view for explaining the timing of measuring the voltage and current of a fuel cell cell according to an embodiment of the present invention.
5 is a view for explaining a fuel cell voltage according to an embodiment of the present invention.

Hereinafter, an apparatus and method for measuring average power of a fuel cell according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of users or operators. Therefore, definitions for these terms should be made based on the contents throughout the present specification.

1 is a block diagram of an apparatus for measuring average power of a fuel cell cell according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the fuel cell average power measurement apparatus according to an embodiment of the present invention includes a fuel cell stack 100, a power supply unit 200, a current measurement unit 300, a voltage measurement unit 400, and a control unit. Includes 500. The fuel cell average power measurement apparatus shown in FIG. 1 is according to an embodiment, and its components are not limited to the embodiment shown in FIG. 1, and some components may be added, changed, or deleted as necessary. I can.

The fuel cell stack 100 is configured by successively arranging a plurality of unit cells 111. The fuel cell stack 100 generates a signal current, and the current measuring unit 300 may measure the current of the fuel cell stack 100 by analyzing the signal current applied from the fuel cell stack 100.

The power supply unit 200 supplies power required for the operation of the voltage measurement unit 400. The power supply unit 200 floats the ground to supply the floated voltage.

The current measuring unit 300 measures the current at the output terminal of the fuel cell stack 100 and transmits the measured current to the controller 500.

The voltage measuring unit 400 sequentially measures the forward voltage from the lowest unit cell to the highest unit cell among the unit cells 111 constituting the fuel cell stack 100, and sequentially measures the reverse voltage from the highest unit cell to the lowest unit cell. Measure In this case, the voltage measurement unit 400 may measure a reverse voltage based on a current measurement time point, and the current measurement time point may mean a time point at which the current measurement unit 300 measures the current.

The voltage measurement unit 400 transmits the measured forward voltage and reverse voltage to the control unit 500.

As described above, the voltage measurement unit 400 does not measure the voltage of all the unit cells 111 constituting the fuel cell stack 100 only once, but Voltages of the unit cells 111 may be measured again in reverse order. In this way, if the voltage is measured from the lowest unit cell and then the voltage is measured again in the reverse order, it is possible to have an effect of synchronizing the voltage measurement timing. That is, although the voltages of the unit cells 111 were measured at different times, the average voltage was calculated by measuring the voltages of all the unit cells 111 twice. You can get the effect.

A detailed description of the voltage measurement unit 400 will be made with reference to FIG. 2.

When the forward voltage measurement by the voltage measurement unit 400 is completed, the control unit 500 controls the voltage measurement unit 400 to measure the reverse voltage based on the current measurement time, and the forward voltage, reverse voltage, and current measurement unit ( 300) is used to calculate the average power. In this case, the controller 500 may calculate an average of the forward voltage and the reverse voltage, and calculate the average power by multiplying the calculated average voltage and the measured current. That is, the controller 500 may calculate the average power of the fuel cell stack 100 by using Equation 1 below.

[Equation 1]

Here, the measurement point has the same meaning as the current measurement point, and may mean the point at which the current measurement unit 300 measures the current, and the measurement point current may be the current measured by the current measurement unit 300 at the measurement point. have.

In addition, the controller 500 compares the average power with the instantaneous power of each unit cell, and detects an abnormal operation of the corresponding unit cell when an error equal to or greater than a preset threshold occurs as a result of the comparison. In this case, the controller 500 may calculate the instantaneous power of each unit cell by using the voltage of the unit cell measured by the voltage measuring unit 400 and the current measured by the current measuring unit 300.

The average power can guarantee power measurement accuracy when a large voltage fluctuation occurs. On the other hand, instantaneous power may reduce power measurement accuracy due to a measurement time error when there is a voltage fluctuation. Accordingly, the controller 500 may compare the average power and the instantaneous power in real time to detect an instantaneous abnormal operation of the fuel cell when an error of more than a threshold value occurs in a specific section.

The control unit 500 may be implemented as a microcontrol unit (MCU), and uses a forward voltage and a reverse voltage provided from the voltage measurement unit 400, and a current provided from the current measurement unit 300. Calculate the average power of ).

As described above, the fuel cell average power measurement apparatus according to an embodiment of the present invention measures the voltages of the unit cells 111 at different times, but measures the voltages of all the unit cells 111 twice to calculate the average voltage. , It is possible to obtain the effect of measuring all cell voltages at a specific time point (eg, current measurement time point). The accuracy of the average power can be improved by synchronizing the timing of the cell voltage measurement.

2 is a block diagram illustrating a voltage measuring unit according to an embodiment of the present invention.

Referring to FIG. 2, a voltage measuring unit 400 according to an embodiment of the present invention includes a voltage meter 410, a level shifter 420, a scaler 430, a mux 440, and an amplifier unit 450 and It includes an AD converter (Analog Digital Converter) 460.

The voltage meter measures the voltage for each unit cell 111.

The voltage meter 410 includes a voltage sensor 411, a replica unit 412 and a switch 413.

The switch 413 has one end connected between the unit cells 111 through connection pins (C0 to Cn), and the other end connected to a voltage sensor 411 to be described later, so that the unit cell 111 to be measured and the corresponding The voltage sensor 411 measuring the unit cell 111 is electrically connected.

Two switches 413 are respectively connected to one voltage sensor 411 so as to be electrically connected to each of the voltage sensors 411 described above. In this case, the switch 413 is commonly connected to the adjacent voltage sensor 411.

For example, the switch 413 connected to the connection pin C1 is common with the voltage sensor 411 that measures the voltage of the lowest unit cell and the voltage sensor 411 that measures the voltage of the unit cell 111 above the lowest unit cell. When the voltage of the unit cell 111 above the lowest unit cell as well as the voltage of the lowest unit cell is measured, all of the voltage of the unit cell 111 may be turned on.

That is, in the case of measuring the voltage of the lowest unit cell, the switch 413 connected to the two connection pins (C0 and C1) is turned on, and at this time, the voltage sensor 411 connected to the corresponding switch 413 is the lowest unit. Measure the voltage of the cell.

In addition, when measuring the voltage of the unit cell 111 above the lowest unit cell, the switch 413 connected to the connection pins C1 and C2 is turned on, and at this time, the voltage sensor 411 connected to the corresponding switch 413 A measures the voltage of the unit cell 111 above the lowermost unit cell.

The voltage sensor 411 is installed in a one-to-one correspondence to each of the unit cells 111 to sense a voltage for each unit cell 111. The voltage sensor 411 has a capacitor (not shown) therein, and when the switch 413 is turned on, a method of measuring the voltage of the power charged in the corresponding capacitor may be used.

A method in which the voltage sensor 411 senses the voltage of the unit cell 111 is not particularly limited, and any method that senses the voltage of the unit cell 111 may be included.

The replica unit 412 measures a noise voltage according to the switching operation of the switch 413. The replica unit 412 may be manufactured in the same structure as the voltage sensor 411 described above. For example, during the switching operation of the switch 413, a noise voltage may be generated according to the switching operation. As a result, even if a voltage of 5V is detected by the voltage sensor 411, the replica unit 412 can detect a noise voltage of 0.1V.

The amplifier unit 450 outputs an actual voltage of the unit cell 111 by subtracting the noise voltage measured by the replica unit 412 from the voltage measured by the voltage sensor 411, thereby minimizing a voltage error. The amplifier unit 450 may be installed inside the voltage meter 410, but may be installed at the rear end of the scaler 430 or the mux 440, which will be described later.

That is, the amplifier unit 450 may be installed at the rear end of the mux 440 as shown in FIG. 2, but may also be installed at the rear end of the voltage sensor 411 and the replica unit 412 in the voltage meter 410. have.

In this embodiment, the scaler 430 or the mux 440 may be omitted. In this case, the amplifier unit 450 may be installed at the rear end of the voltage sensor 411 and the replica unit 412 inside the voltage meter 410.

On the other hand, when the scaler 430 and the mux 440 are provided, the amplifier unit 450 may be installed at the rear end of the mux 440 or at the rear end of the scaler 430.

The amplifier unit 450 may be installed in various locations depending on whether the scaler 430 and the mux 440 are installed.

The level shifter 420 drops the voltage of each of the unit cells 111 into an operable breakdown voltage range. Typically, it is 100V or more of the voltage of the unit cell 111. Since the voltage of the unit cell 111 is not suitable for the operation of the amplifier or AD converter 460 to be described later, the level is shifted to a voltage level at which the amplifier unit 450 or the AD converter 460 can operate normally. In addition, the level shifter 420 inputs the voltage measured by the voltage sensor 411 into the scaler 430 so that the scaler 430 or the mux 440 can operate normally.

The scaler 430 scales the voltage sensed by the voltage sensor 411 to a voltage at a level that can be input by the mux 440, the amplifier unit 450, or the AD converter 460 at the rear stage.

In general, the mux 440, the amplifier unit 450, or the AD converter 460 is a low-voltage device and has a relatively low voltage at a level that they can receive. Accordingly, the scaler 430 scales the voltage sensed by the voltage sensor 411 to a level that can be input by the mux 440, the amplifier unit 450, or the AD converter 460 at the rear stage as described above. Thus, the mux 440, the amplifier unit 450, or the AD converter 460 can operate normally.

The mux 440 sequentially outputs the voltage of each unit cell 111 input from the scaler 430 described above.

In this embodiment, it has been described as an example that the mux 440 is installed at the rear end of the scaler 430, but the technical scope of the present invention is not limited thereto, and the mux 440 is installed at the rear end of the level shifter 420 It is also possible. In this case, the scaler 430 need not be separately provided.

Meanwhile, the amplifier unit 450 may be installed inside the voltage measuring unit 400 as described above, but may also be installed at the rear end of the mux 440.

The AD converter 460 is installed at the rear end of the amplifier unit 450 and converts the voltage of each unit cell 111 output from the amplifier 45 into a digital signal.

3 is a flowchart illustrating a method of measuring average power of a fuel cell cell according to an embodiment of the present invention, and FIG. 4 is a view for explaining measurement timing of a fuel cell voltage and current according to an embodiment of the present invention, and FIG. 5 Is a diagram for explaining a fuel cell voltage according to an embodiment of the present invention.

Referring to FIG. 3, the voltage measuring unit 400 sequentially measures the forward voltage from the lowest unit cell to the highest unit cell among the unit cells 111 constituting the fuel cell stack 100 (S310). For example, the voltage measuring unit 400 may sequentially measure the voltage from cell 1 to cell N as shown in A illustrated in FIG. 4.

When step S310 is performed, the current measuring unit 300 measures the current at the output terminal of the fuel cell stack 100 (S320). For example, the current measuring unit 300 may measure the current of the fuel cell stack 100 at the current measurement time point B as shown in FIG. 4.

When step S320 is performed, the voltage measuring unit 400 measures the reverse voltage sequentially from the highest unit cell to the lowest unit cell (S330). For example, the voltage measurement unit 400 may sequentially measure the voltage from cell N to cell 1 as shown in C shown in FIG. 4.

When step S330 is performed, the controller 500 calculates an average of the forward voltage and the reverse voltage (S340). For example, the control unit 500 may calculate an average of the forward voltage from cell 1 to cell N and the reverse voltage from cell N to cell 1. In this way, when the average of the forward voltage and the reverse voltage is calculated, as shown in FIG. 5, the time point at which the average voltage is calculated and the time point at which the current is measured are the same. Measured effect can be obtained.

When step S340 is performed, the controller 500 calculates the average power of the fuel cell stack 100 by using the calculated average voltage and the measured current (S350). In this case, the controller 500 may calculate the average power by multiplying the calculated average voltage and the measured current.

By calculating the average power through synchronization of the cell voltage measurement point in this way, the accuracy of the average power can be improved.

After step S350, the controller 500 compares the average power with the instantaneous power of each unit cell, and detects an abnormal operation of the corresponding unit cell when an error of more than a preset threshold occurs as a result of the comparison. In this case, the controller 500 may calculate the instantaneous power of each unit cell by using the voltage of the unit cell measured by the voltage measuring unit 400 and the current measured by the current measuring unit 300.

Meanwhile, in the above, only the method of calculating the average power P1 shown in FIG. 4 has been described, but the voltage measurement unit 400 performs step S330 to sequentially measure the reverse voltage from cell N to cell 1 as shown in D I can. Then, the voltage measurement unit 400 may measure the current of the fuel cell stack 100 at the current measurement point E, and measure the forward voltage from cell 1 to cell N as shown in F. Then, the controller 500 may calculate the average power P2 using the reverse voltage from cell N to cell 1 and the forward voltage from cell 1 to cell N.

The fuel cell average power measuring device measures the voltage of the unit cells 111 in the order of forward to reverse to calculate the average power P1, and calculates the average power P2 by measuring the voltage of the unit cells 111 in the reverse to forward order. can do. As such, the fuel cell average power measuring apparatus may calculate the average power by measuring the voltage of the unit cells 111 in a half-cycle unit.

As described above, in the fuel cell average power measurement apparatus and method according to an embodiment of the present invention, the forward voltage is sequentially measured from the lowest unit cell to the highest unit cell of the fuel cell stack 100, and the current measurement time point is determined. As a reference, by sequentially measuring the reverse voltage from the highest unit cell to the lowest unit cell, and then calculating the average voltage of the forward voltage and the reverse voltage, the effect of measuring all cell voltages at the time of current measurement can be obtained.

Further, the average power of the fuel cell stack 100 can be accurately calculated by synchronizing the voltage measurement time point and the current measurement time point of the fuel cell stack 100. This makes it possible to accurately diagnose and measure the state of the fuel cell with high variability, thereby preventing damage to the fuel cell.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is only illustrative, and those of ordinary skill in the field to which the technology pertains, various modifications and other equivalent embodiments are possible. I will understand.

Therefore, the true technical protection scope of the present invention should be determined by the following claims.

100: fuel cell stack
200: power supply
300: current measuring unit
400: voltage measuring unit
410: voltage meter
420: level shifter
430: scaler
440: mux
450: amplifier unit
460: ADC
500: control unit

Claims (12)

A voltage measuring unit for sequentially measuring a forward voltage from a lowest unit cell to a highest unit cell among unit cells constituting the fuel cell stack, and sequentially measuring a reverse voltage from the highest unit cell to the lowest unit cell;
A current measuring unit measuring a current at an output terminal of the fuel cell stack; And
After the measurement of the forward voltage of the voltage measurement unit is completed, a control unit that controls the voltage measurement unit to measure a reverse voltage based on the current measurement time point, and calculates an average power using the forward voltage, the reverse voltage, and the measured current
Fuel cell average power measuring device comprising a.
The method of claim 1,
The voltage measuring unit,
A voltage meter measuring voltage for each unit cell;
A mux sequentially outputting the voltage measured for each unit cell by the voltage meter; And
And an ADC that converts the voltage of each unit cell output from the mux into a digital signal.
The method of claim 2,
The voltage meter,
At least one voltage sensor installed in a one-to-one correspondence to each of the unit cells to sense a voltage for each unit cell;
A switch electrically connecting the unit cell to the voltage sensor; And
And a replica unit for measuring a noise voltage according to a switching operation of the switch.
The method of claim 3,
The voltage measuring unit,
And an amplifier unit for subtracting the noise voltage measured by the replica unit from the voltage measured by the voltage sensor.
The method of claim 2,
The voltage measuring unit,
And a level shifter for level shifting the voltage of each unit cell measured by the voltage meter within an operable withstand voltage range and providing the voltage to the mux.
The method of claim 2,
The voltage measuring unit,
And a scaler for downscaling the voltage measured for each unit cell by the voltage meter.
The method of claim 1,
The control unit,
And calculating an average power by calculating an average of the forward voltage and the reverse voltage, and multiplying the calculated average voltage by the measured current.
The method of claim 1,
The control unit,
And comparing the average power with the instantaneous power of each unit cell, and detecting an abnormal operation of a corresponding unit cell when an error of more than a preset threshold value occurs as a result of the comparison.
The method of claim 8,
The control unit,
The apparatus for measuring average power of a fuel cell cell, characterized in that the instantaneous power of each unit cell is calculated using the voltage of the unit cell measured by the voltage measuring unit and the current measured by the current measuring unit.
Sequentially measuring a forward voltage from the lowest unit cell to the highest unit cell among unit cells constituting the fuel cell stack by a voltage measurement unit;
Measuring a current at an output terminal of the fuel cell stack by a current measuring unit;
Sequentially measuring a reverse voltage from the uppermost unit cell to the lowermost unit cell by the voltage measuring unit; And
Calculating an average of the forward voltage and the reverse voltage, and calculating the average power of the fuel cell stack by using the calculated average voltage and the measured current
Fuel cell average power measurement method comprising a.
The method of claim 10,
In the step of calculating the average power of the fuel cell stack,
The control unit calculates average power by multiplying the average voltage and the measured current.
The method of claim 10,
After calculating the average power of the fuel cell stack,
The control unit further comprises the step of comparing the average power with the instantaneous power of each unit cell, and detecting an abnormal operation of the corresponding unit cell when an error of more than a preset threshold value occurs as a result of the comparison. How to measure the average power of a fuel cell cell.

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