KR20170000455A - Apparatus for monitoring condition of stack of fuel cell using spectrum and method thereof - Google Patents

Apparatus for monitoring condition of stack of fuel cell using spectrum and method thereof Download PDF

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KR20170000455A
KR20170000455A KR1020150089177A KR20150089177A KR20170000455A KR 20170000455 A KR20170000455 A KR 20170000455A KR 1020150089177 A KR1020150089177 A KR 1020150089177A KR 20150089177 A KR20150089177 A KR 20150089177A KR 20170000455 A KR20170000455 A KR 20170000455A
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fuel cell
cell stack
state
spectrum
stack
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KR101702224B1 (en
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이용현
유승열
김종현
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강남대학교 산학협력단
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    • G01R31/3658—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0007—Frequency selective voltage or current level measuring
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/10—Measuring sum, difference or ratio
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/06—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into an amplitude of current or voltage

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Abstract

The present invention relates to an apparatus for diagnosing a condition of a fuel cell stack using a spectrum and a method thereof. According to the present invention, the apparatus for monitoring the condition of a fuel cell stack comprises a measuring part, a total harmonic distortion (THD) calculation part, a THD comparison part, a calculation part and a diagnosing part. The measuring part applies a diagnosis signal with a multi-frequency, consisting of a plurality of sine waves, as a diagnosis signal for responding to a frequency, to a stack to measure stack current or stack voltage. The THD calculation part converts the stack current or the stack voltage into frequencies to calculate THD. The THD comparison part compares the THD with a first critical value and, when the THD is less than the first critical value, compares the THD with a second critical value which is smaller than the first critical value. When the THD is bigger than the second critical value but smaller than the first critical value, the calculation part calculates a spectrum changed amount, which is the difference between a spectrum with an output frequency and a spectrum in a pre-stored normal state and compares the spectrum changed amount with a reference value. The diagnosing part diagnoses a condition of the fuel cell stack by using a comparison result of the THD or the spectrum changed amount. According to the present invention, erroneous diagnosis on the condition of the stack due to noise or increase of an output voltage element corresponding to an input frequency can be solved, and the condition of the stack can be accurately diagnosed.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and method for diagnosing a state of a fuel cell stack using a spectrum,

The present invention relates to an apparatus and method for diagnosing a state of a fuel cell stack using a spectrum, and more particularly, to an apparatus and method for diagnosing a state of a fuel cell stack using a frequency spectrum of the fuel cell stack.

A fuel cell refers to a type of power generation apparatus that converts chemical energy contained in a fuel such as hydrogen or methanol into electricity by electrochemically reacting the chemical energy in the stack without converting it into heat by combustion. Initially, fuel cells have begun to be developed as independent power sources for mobile devices such as automobiles and satellites, and can be applied not only to electric power for industrial, home and vehicle driving but also to power supply of small electric / electronic products, especially portable devices.

As a power source for driving a vehicle, a polymer electrolyte membrane fuel cell (PEMFC) having the highest power density among the fuel cells is most studied, And a fast power conversion reaction time.

In order to obtain a necessary electric potential in a real vehicle, a unit cell must be stacked by a necessary potential, and a unit cell is stacked. The potential generated in one unit cell is about 1.3 V, and a plurality of cells are stacked in series to produce power required for driving the vehicle.

FIG. 1 is a view for explaining cell state diagnosis through conventional nonlinearity detection.

As shown in FIG. 1, the stack voltage / current characteristics in a normal operation have a linear relationship but change to a non-linear relationship under abnormal operating conditions. That is, if the non-linearity of the stack voltage is measured, it can be determined that the stack state is abnormal.

However, in the existing fuel cell system diagnosis method using the total harmonic distortion (THD) value through the frequency analysis, the frequency components other than the harmonic components such as noise are detected, and the THD value of the steady state stack increases, It is possible to erroneously diagnose that the fuel cell of the fuel cell is in an abnormal state. In addition, since the voltage spectrum corresponding to the input frequency component in the frequency domain increases in the abnormal stack, the THD value is lowered, so that the state of the fuel cell can not be accurately diagnosed.

The technique which is the background of the present invention is described in Korean Patent Registration No. 10-1416400 (published on Aug. 31, 2014).

The present invention relates to an apparatus and method for diagnosing a state of a fuel cell stack using a spectrum, and more particularly, to an apparatus and method for diagnosing a state of a fuel cell stack using a frequency spectrum of a fuel cell stack have.

According to an aspect of the present invention, there is provided an apparatus for diagnosing a state of a fuel cell stack using a spectrum according to an embodiment of the present invention. The system includes a plurality of sine wave multi- A THD calculator for calculating a harmonic distortion rate (THD) by frequency-converting the stack current or the stack voltage, and comparing the harmonic distortion rate with a first threshold value, and when the harmonic distortion rate is less than the first threshold value, A THD comparator for comparing a harmonic distortion rate with a second threshold value smaller than the first threshold value; and a THD comparator for comparing the harmonic distortion rate with a second threshold value smaller than the first threshold value, Which is the difference between the spectra of the spectrum And a diagnostic unit for diagnosing the state of the fuel cell stack using the harmonic distortion rate or the comparison result of the amount of spectrum change.

The diagnosis unit may diagnose the state of the fuel cell stack to an abnormal state when the harmonic distortion rate is equal to or greater than a first threshold value.

The diagnosis unit may diagnose the state of the fuel cell stack to a normal state when the harmonic distortion rate is smaller than a second threshold value.

The diagnosis unit may diagnose the state of the fuel cell stack to an abnormal state when the amount of spectrum change is equal to or greater than a reference value as a result of the comparison of the amount of spectrum change and if the amount of spectrum change is smaller than a reference value, The state can be diagnosed as a normal state.

Also, the multi-frequency diagnostic signal may include at least one input frequency, and the operation unit may calculate the amount of spectrum change with respect to the spectrum corresponding to the input frequency, or may calculate the amount of spectrum change corresponding to the total frequency of the multi- The amount of spectrum change can be calculated with respect to the spectrum.

A method for diagnosing a state of a fuel cell stack performed by a state diagnostic apparatus of a fuel cell stack using a spectrum according to another embodiment of the present invention is a method for diagnosing a state of a fuel cell stack using a plurality of sinusoidal multi- Measuring a stack current or a stack voltage, frequency-converting the stack current or the stack voltage to calculate a harmonic distortion rate (THD), comparing the harmonic distortion rate to a first threshold value and comparing the harmonic distortion rate with the first threshold value Comparing the harmonic distortion rate with a second threshold value that is smaller than the first threshold value; if the harmonic distortion rate is larger than the second threshold value and smaller than the first threshold value, And calculates the amount of spectrum change, which is the difference of the spectrum in the state Comparing the amount of change in the spectrum with a reference value, and diagnosing the state of the fuel cell stack using the harmonic distortion rate or the comparison result of the amount of spectrum change.

Therefore, according to the present invention, by using the apparatus for diagnosing the state of a fuel cell stack using the spectrum and the method thereof, it is possible to overcome the error of the stack state due to the increase of the output voltage component corresponding to noise or input frequency, can do.

In addition, it is possible to facilitate the normal / abnormal determination of the stack by using the variation amount of the spectrum, and the diagnosis rate of the stack state can be enhanced.

FIG. 1 is a view for explaining cell state diagnosis through conventional nonlinearity detection.
FIG. 2 is a view for explaining a state diagnostic apparatus for a fuel cell stack according to an embodiment of the present invention.
3 is a block diagram showing the configuration of a state diagnostic apparatus for a fuel cell stack according to an embodiment of the present invention.
4 is a flowchart illustrating a method for diagnosing conditions of a fuel cell stack according to an embodiment of the present invention.
5 is a graph showing spectrums of frequencies of diagnostic signals according to an embodiment of the present invention.
FIG. 6 is a graph showing the amount of spectrum change measured by the state diagnostic apparatus of the fuel cell stack according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

FIG. 2 is a view for explaining a state diagnostic apparatus for a fuel cell stack according to an embodiment of the present invention.

2, the state diagnostic apparatus 100 of the fuel cell stack is connected to the fuel cell stack 200 and the load 300. As shown in FIG. The signal generator 101 for generating an external signal applied to the fuel cell stack 200 may be provided inside or outside the state diagnostic apparatus 100 of the fuel cell stack as shown in FIG.

Here, the external signal generated by the signal generator 101 is applied to the fuel cell stack operating current by the state diagnostic apparatus 100 of the fuel cell stack through the signal line 102. Further, the signal generator 101 generates and outputs a diagnostic signal for multiple frequency responses, for example, a multi-frequency diagnostic current (I test ).

The apparatus 100 for diagnosing a condition of a fuel cell stack according to an embodiment of the present invention generates an external signal 101 corresponding to a current or a voltage and applies it to an existing current of the fuel cell stack 200, Lt; RTI ID = 0.0 > (I Load ) < / RTI > The state diagnostic apparatus 100 shown in FIG. 2 ultimately detects whether the fuel cell stack 200 is in a normal state or an abnormal state by using the harmonic distortion and the amount of spectrum change calculated by frequency- Diagnosis.

3 is a block diagram showing the configuration of a state diagnostic apparatus for a fuel cell stack according to an embodiment of the present invention.

3, the state diagnostic apparatus 100 of the fuel cell stack includes a measurement unit 110, a THD calculation unit 120, a THD variation comparison unit 130, an operation unit 140, and a diagnosis unit 150.

First, the measurement unit 110 applies a multi-frequency diagnostic signal composed of a plurality of sinusoidal waves as a frequency response diagnostic signal to the fuel cell stack 200 to be measured to measure the stack current or the stack voltage.

The THD calculator 120 frequency-converts the stack current or the stack voltage to calculate a total harmonic distortion (THD).

The stack current or stack voltage measurement of the measurement unit 110 and the THD calculation of the THD calculation unit 120 can be easily measured by a person skilled in the art, so a detailed description thereof will be omitted.

Next, the THD variation comparing unit 130 compares the harmonic distortion rate with the first threshold value, and when the harmonic distortion rate is less than the first threshold value, the THD variation comparing unit 130 compares the second threshold value with the harmonic distortion rate. At this time, the second threshold value has a value smaller than the first threshold value.

When the harmonic distortion rate is larger than the second threshold value and smaller than the first threshold value, the operation unit 140 calculates a spectral change amount that is a difference between the spectrum of the output frequency and the spectrum in the pre-stored steady state. In addition, the operation unit 140 compares the calculated amount of spectrum change with a reference value.

Finally, the diagnosis unit 150 diagnoses the state of the fuel cell stack 200 using the comparison result of the harmonic distortion ratio or the amount of spectrum change.

Hereinafter, a method for diagnosing conditions of the fuel cell stack according to an embodiment of the present invention will be described in more detail with reference to FIG. 4 through FIG.

4 is a flowchart illustrating a method for diagnosing conditions of a fuel cell stack according to an embodiment of the present invention.

First, the state diagnostic apparatus 100 of the fuel cell stack applies a multi-frequency diagnostic signal to the fuel cell stack 200 to be diagnosed to measure the stack current or the stack voltage (S410).

Here, the multi-frequency diagnostic signal may be a plurality of sine waves as a frequency response diagnostic signal, and may be generated by a signal generator 101 provided inside or outside the state diagnostic apparatus 100 of the fuel cell stack have.

Further, the multi-frequency diagnostic signal includes one or more input frequencies. For convenience of explanation, it has been described that the state diagnostic apparatus 100 of the fuel cell stack applies a multi-frequency diagnostic signal including two input frequencies (16 Hz, 32 Hz) to the fuel cell stack 200, Do not.

For example, when the basic current (I stack ) of the fuel cell stack 200 is A and the multi-frequency diagnostic signal I test consisting of a plurality of sinusoidal waves as the frequency response diagnostic signal is B 1 sin (ω 1 t) + B If the 2 sin (ω 2 t), a measuring unit 110, a (I + I stack test) measured stack current is a + B 1 sin (ω 1 t) + B 2 sin (ω 2 t). Here, B 1 and B 2 denote amplitudes, and ω 1 and ω 2 denote angular frequencies. Further, if a fast Fourier transform (FFT) is applied to the stack voltage measured by the measuring unit 110, it can be expressed by the following equation (1).

Figure pat00001

Next, the state diagnostic apparatus 100 of the fuel cell stack frequency-converts the measured stack current or the stack voltage to calculate a harmonic distortion (THD) (S420).

For example, when the stack current is A + B 1 sin (ω 1 t) + B 2 sin (ω 2 t) and the stack voltage is equal to Equation 1, the THD calculator 120 calculates the harmonic distortion THD) can be calculated by the following equation (2).

Figure pat00002

Here, V test1 and V test2 represent output voltage components corresponding to the respective input frequencies, and V n represents the other non-input harmonic frequency components.

The state diagnostic apparatus 100 of the fuel cell stack compares the calculated harmonic distortion (THD) with the first threshold value (S430).

When the harmonic distortion rate THD is equal to or greater than the first threshold value, the state diagnostic apparatus 100 of the fuel cell stack diagnoses the state of the fuel cell stack 200 to be diagnosed abnormally (S440). For example, when the first threshold is 40% and the harmonic distortion (THD) of the fuel cell stack 200 is 60%, the state diagnostic apparatus 100 of the fuel cell stack determines that the fuel cell stack 200 is abnormal State.

On the other hand, if the harmonic distortion rate (THD) is less than the first threshold value, the state diagnostic apparatus 100 of the fuel cell stack compares the second threshold value with the harmonic distortion rate THD (S450).

Here, the second threshold value has a smaller value than the first threshold value, which means a reference value that can determine the state of the fuel cell stack 200 as a normal state.

If the harmonic distortion (THD) is smaller than the second threshold value, the state of the fuel cell stack 200 is determined to be normal (S460).

For example, when the second threshold is 20% and the harmonic distortion (THD) of the fuel cell stack 200 to be diagnosed is 15%, the state diagnostic apparatus 100 of the fuel cell stack detects the state of the fuel cell stack 200, Is in a normal state.

On the other hand, if the harmonic distortion rate THD is equal to or greater than the second threshold, the state diagnostic apparatus 100 of the fuel cell stack calculates the amount of spectrum change (S470).

The state diagnostic apparatus 100 of the fuel cell stack can calculate the amount of spectrum change through the following equation (3).

Figure pat00003

Here, △ Spectrum means a spectrum change amount, Spectrum Defected means a spectrum of output frequency, and Spectrum Normal means a spectrum in a pre -stored steady state.

The apparatus 100 for diagnosing a condition of a fuel cell stack according to an embodiment of the present invention calculates a spectrum change amount for a spectrum corresponding to an input frequency received in step S410 or calculates a spectrum change amount for a spectrum corresponding to a total frequency of a multi- The amount of spectrum change can be calculated.

5 is a graph showing spectrums of frequencies of diagnostic signals according to an embodiment of the present invention.

As shown in FIG. 5, the amount of spectrum change is calculated using the frequency-specific spectrum of the fuel cell stack (Defected) to be diagnosed and the frequency-specific spectrum of the fuel cell stack (Normal).

At this time, the state diagnostic apparatus 100 of the fuel cell stack calculates the amount of spectrum change with respect to the spectrum corresponding to the input frequencies of 16 Hz and 32 Hz, or calculates the spectral change amount with respect to the spectrum corresponding to the total frequency of the diagnostic signals of multiple frequencies such as 0 Hz to 50 Hz The amount of spectrum change can be calculated.

FIG. 6 is a graph showing the amount of spectrum change measured by the state diagnostic apparatus of the fuel cell stack according to the embodiment of the present invention.

6A is a graph showing the THD value of the fuel cell stack Normal in a steady state according to the prior art and the THD value of the fuel cell stack Defected 200 as a diagnostic target. 6 (a), when the state of the fuel cell stack 200 is diagnosed using the THD value according to the related art, the value of the input voltage or the input current increases, while the value of the harmonic component The THD value of the fuel cell stack 200 in a failed state becomes small. Therefore, when the state of the fuel cell stack 200 is diagnosed using only the THD value, the state of the fuel cell stack (defected) 200 to be diagnosed can not be accurately diagnosed.

6 (b), when the state of the fuel cell stack 200 is diagnosed using the spectrum change amount ΔSpumulus, the normal state of the fuel cell stack Normal and the fuel cell stack The state diagnostic apparatus 100 of the fuel cell stack according to the embodiment of the present invention can more accurately diagnose the state of the defected fuel cell stack 200 .

The state diagnostic apparatus 100 of the fuel cell stack compares the calculated amount of spectrum change with a reference value (S480).

If the amount of spectrum change is equal to or greater than the reference value, the state diagnostic apparatus 100 of the fuel cell stack diagnoses the state of the fuel cell stack 200 as abnormal as in S440. If the amount of spectrum change is smaller than the reference value, 200) is diagnosed as normal as in S460.

6 (b), the state diagnostic apparatus 100 of the fuel cell stack diagnoses that the corresponding fuel cell stack 200 is in an abnormal state.

In the case of diagnosing the state of the fuel cell stack 200 using only the existing THD value, the noise, which is frequency components other than the input frequency and its harmonic component, is detected and the THD value of the fuel cell stack 200 in a steady state may be increased have. Therefore, since the THD value of the ideal normal fuel cell stack 200 is greater than zero, the normal stack can be diagnosed to be in an abnormal state.

In addition, the amplitude of the input frequency of the fuel cell stack 200 in an abnormal state increases, so that the THD value of the fuel cell stack 200 in an abnormal state can be lowered. As shown in FIG. 1, the slope of the voltage or current characteristic curve of the fuel cell stack 200 in an abnormal state becomes larger, so that the magnitude of the input frequency component can be increased. At this time, since the size of the noise component does not change, the THD value of the fuel cell stack 200 in an abnormal state is lowered as a result. Due to this, the state diagnostic apparatus of the fuel cell stack 200 may diagnose that the stack in an abnormal state in which the THD value is lowered is in a normal state.

However, the apparatus 100 for diagnosing a state of a fuel cell stack using a spectrum according to an embodiment of the present invention is different from the frequency spectrum of the fuel cell stack 200 in a steady state and the frequency spectrum difference of the fuel cell stack 200 in an abnormal state Since the state of the fuel cell stack 200 is diagnosed by using the amount of spectrum change, the state of the fuel cell stack 200 can be more accurately diagnosed and diagnosis rate can be increased.

As described above, according to the present invention, it is possible to overcome the misdiagnosis of the fuel cell stack state due to the increase of the output voltage component corresponding to the noise or the input frequency, The state of the battery stack can be diagnosed. In addition, it is possible to facilitate the normal / abnormal determination of the fuel cell stack using the variation amount of the spectrum, and the diagnostic rate of the fuel cell stack state can be improved.

The present invention has been described above with reference to the embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. Therefore, the scope of the present invention is not limited to the above-described embodiments, but should be construed to include various embodiments within the scope of the claims and equivalents thereof.

100: Status diagnostic device of fuel cell stack
101: Signal generator 102: Signal line
110: measuring unit 120: THD calculating unit
130: THD variation comparing unit 140:
150: diagnosis part 200: fuel cell stack
300: load

Claims (10)

An apparatus for diagnosing conditions of a fuel cell stack,
A measurement unit for measuring a stack current or a stack voltage by applying a multi-frequency diagnostic signal composed of a plurality of sinusoidal waves to the stack as a frequency response diagnostic signal,
A THD operation unit for frequency-converting the stack current or the stack voltage to calculate a harmonic distortion (THD)
A THD comparison unit for comparing the harmonic distortion rate with a first threshold value and comparing the harmonic distortion rate to a second threshold value smaller than the first threshold value when the harmonic distortion rate is less than the first threshold value,
Calculating a spectral change amount that is a difference between a spectrum of an output frequency and a spectrum in a pre-stored steady state when the harmonic distortion rate is larger than the second threshold value and smaller than the first threshold value and compares the spectral change amount with a reference value And
And a diagnostic unit for diagnosing the state of the fuel cell stack using a comparison result of the harmonic distortion ratio or the amount of spectrum change. The method according to claim 1,
Wherein the diagnosis unit comprises:
And diagnoses the state of the fuel cell stack to an abnormal state when the harmonic distortion rate is equal to or greater than a first threshold value. The method according to claim 1,
Wherein the diagnosis unit comprises:
And diagnoses the state of the fuel cell stack to a normal state when the harmonic distortion rate is smaller than a second threshold value. The method according to claim 1,
Wherein the diagnosis unit comprises:
And diagnosing the state of the fuel cell stack to an abnormal state when the amount of spectrum change is greater than or equal to a reference value and diagnosing the state of the fuel cell stack as a normal state when the amount of spectrum change is less than a reference value, Wherein the fuel cell stack is a fuel cell stack. The method according to claim 1,
Wherein the multi-frequency diagnostic signal comprises:
Comprising at least one input frequency,
The operation unit,
And calculates the spectrum change amount with respect to a spectrum corresponding to the input frequency or calculates the spectrum change amount with respect to a spectrum corresponding to the entire frequency of the diagnostic signal of multiple frequencies. A method for diagnosing a state of a fuel cell stack using an apparatus for diagnosing a state of the fuel cell stack,
Measuring a stack current or a stack voltage by applying a multi-frequency diagnostic signal including a plurality of sinusoidal waves to the stack as a frequency response diagnostic signal,
Calculating a harmonic distortion (THD) by frequency-converting the stack current or the stack voltage,
Comparing the harmonic distortion rate with a first threshold value and comparing the harmonic distortion rate to a second threshold value smaller than the first threshold value when the harmonic distortion rate is less than the first threshold value,
Calculating a spectral change amount that is a difference between a spectrum of an output frequency and a spectrum in a pre-stored steady state when the harmonic distortion rate is larger than the second threshold value and smaller than the first threshold value and compares the spectral change amount with a reference value Step, and
And diagnosing a state of the fuel cell stack using a comparison result of the harmonic distortion ratio or the amount of spectrum change. The method according to claim 6,
The step of diagnosing the condition of the fuel cell stack includes:
And diagnosing the state of the fuel cell stack to an abnormal state when the harmonic distortion rate is equal to or greater than a first threshold value. The method according to claim 6,
The step of diagnosing the condition of the fuel cell stack includes:
And diagnosing the state of the fuel cell stack to a normal state when the harmonic distortion rate is smaller than a second threshold value. The method according to claim 6,
The step of diagnosing the condition of the fuel cell stack includes:
And diagnosing the state of the fuel cell stack to an abnormal state when the amount of spectrum change is greater than or equal to a reference value and diagnosing the state of the fuel cell stack as a normal state when the amount of spectrum change is less than a reference value, The method comprising: The method according to claim 6,
Wherein the multi-frequency diagnostic signal comprises:
Comprising at least one input frequency,
Calculating the amount of spectrum change, and comparing the amount of spectrum change with a reference value,
Calculating the amount of spectrum change with respect to a spectrum corresponding to the input frequency or calculating the amount of spectrum change with respect to a spectrum corresponding to a total frequency of the multiple frequency diagnostic signals.
KR1020150089177A 2015-06-23 2015-06-23 Apparatus for monitoring condition of stack of fuel cell using spectrum and method thereof KR101702224B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110943245A (en) * 2019-12-12 2020-03-31 上海捷氢科技有限公司 Fuel cell diagnosis harmonic current generation method and system and diagnosis device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007053013A (en) * 2005-08-18 2007-03-01 Toyota Motor Corp Fuel cell system and operation method of fuel cell system
JP2008098134A (en) * 2006-09-11 2008-04-24 Toyota Motor Corp Fuel cell system
JP2009170223A (en) * 2008-01-15 2009-07-30 Toyota Motor Corp Cell voltage monitoring system
KR101090705B1 (en) * 2010-11-25 2011-12-08 강남대학교 산학협력단 Method for monitoring of fuel cell stack status

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007053013A (en) * 2005-08-18 2007-03-01 Toyota Motor Corp Fuel cell system and operation method of fuel cell system
JP2008098134A (en) * 2006-09-11 2008-04-24 Toyota Motor Corp Fuel cell system
JP2009170223A (en) * 2008-01-15 2009-07-30 Toyota Motor Corp Cell voltage monitoring system
KR101090705B1 (en) * 2010-11-25 2011-12-08 강남대학교 산학협력단 Method for monitoring of fuel cell stack status

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110943245A (en) * 2019-12-12 2020-03-31 上海捷氢科技有限公司 Fuel cell diagnosis harmonic current generation method and system and diagnosis device

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