JP2019121429A - Fuel cell system and fuel cell stop discrimination method in the system - Google Patents

Abstract

To provide a fuel cell system in which a stop period of a fuel cell can be discriminated through a simple procedure, and a fuel cell stop discrimination method in the system.SOLUTION: The fuel cell system is provided that comprises: a fuel cell; a power receiving part receiving power from a power company; and a load part consuming the power, and performs power supply to the load part by using both power generated by the fuel cell and the power received by the power receiving part. The fuel cell system further comprises: a baseline acquisition part acquiring a baseline that is a daily standard pattern of power received by the power receiving part; an error discrimination part discriminating whether a baseline error that is a difference obtained by subtracting power at a corresponding time in the baseline from power actually received by the power receiving part is equal to or more than a reference value B based on rating output of the fuel cell; and a stop period discrimination part discriminating a period A in which a ratio occupied by "reference value B or more" in the discrimination by the error discrimination part is equal to or more than a predetermined threshold, as a stop period in which the fuel cell is stopped.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a fuel cell system that supplies power to a load unit using power generated by a fuel cell and purchased power from an electric power company in combination. More specifically, the present invention relates to a fuel cell system capable of determining a stop period in which a fuel cell has stopped based on the results of purchased power. In addition, it also targets the fuel cell shutdown judgment method that determines the fuel cell shutdown period in the same system.

  2. Description of the Related Art Conventionally, it has been practiced that a consumer of electric power is provided with a fuel cell as a so-called distributed power supply, and the generated electric power and purchased electric power from an electric power company are used in combination to meet own electric power demand. Thus, by utilizing the power generation capacity of the fuel cell, it is possible to suppress the purchase of power from the power company. Fuel cells for power generation in this type of fuel cell system are basically used in continuous operation at rated output. Fuel cells as such distributed power sources are often of the type that uses gaseous fuel. The gas fuel is the same as the fuel as a heat source. In this type of fuel cell, it is necessary to provide a periodic shutdown period. It is for gas leak inspection of a gas meter. This stop period is provided once in a period of about one month, and the length of one stop period is about one day.

  On the other hand, from the viewpoint of the power supplier or the manager of the fuel cell system, it is necessary to know the total amount of power demand in the customer. Power demand forecasting and other business needs. As an estimation technique that can be used for that purpose, for example, the “method for estimating power generation output” disclosed in Patent Document 1 can be mentioned. In the technology of this document, the power generation output of the distributed power supply is estimated using the voltage, current, and power factor measured in the distribution line.

JP, 2016-158371, A

  However, the above-described conventional techniques have the following problems. That is, in the estimation method of the same document, as shown in FIG. 1 etc., the generation of the distributed power source is carried out following the procedure of calculating the active power and reactive power, calculating their fluctuations, and further calculating the power flow fluctuation. Estimate the output. Therefore, various data such as voltage, current, and power factor are needed. As described above, there are problems that the calculation process of estimation is complicated and that various data are required. For this reason, it has not been possible to easily determine the stop period of the fuel cell.

  The present invention has been made to solve the problems of the above-described conventional techniques. That is, the subject of the invention is to provide a fuel cell system and a fuel cell stop judgment method for the fuel cell system which can judge the fuel cell stop period by a simple procedure based on data of the amount of power purchased from a power company. It is.

  A fuel cell system according to an aspect of the present invention includes a fuel cell, a power receiving unit that receives power from a power company, and a load unit that consumes power, and the power generated by the fuel cell and the power received by the power receiving unit And a baseline acquisition unit that acquires a baseline that is a standard pattern of the power received by the power reception unit, and the power reception unit actually receives power. An error determination unit that determines whether a baseline error, which is the difference between the calculated power and the power at the corresponding time in the baseline, is greater than or equal to a reference value based on the rated output of the fuel cell; And a stop period determination unit that determines a period in which the proportion of “more than the reference value” in the determination is equal to or more than a predetermined threshold is a stop period in which the fuel cell has stopped.

  In the fuel cell system according to the above aspect, the actual amount of power received from the power company by the power receiving unit is acquired. This acquisition is performed iteratively. Meanwhile, the baseline acquisition unit acquires a baseline. In the error judgment unit, whether the baseline error is "above the reference value" or not is compared by using the actual value of the received power, the power at the corresponding time in the baseline (baseline data), and the reference value. It is judged. Then, the stop period determination unit determines that the period in which the proportion of “more than the reference value” in the determination result is high is the stop period. As described above, in the present embodiment, the only necessary data regarding the supplied power is the actual value of the amount of received power, so that the determination can be made easily. However, the judgment accuracy is also high.

  In the fuel cell system according to the above aspect, the error determination unit further calculates the baseline error, and the reference value determination unit determines whether the baseline error is greater than or equal to the reference value by comparing the baseline error with the reference value. It is preferable to have As a result, it is appropriately determined whether the measured value of the amount of received power should be “above the reference value” or not. Therefore, the determination accuracy is high.

  In the fuel cell system according to any one of the above aspects, the stop interval which is the frequency at which the fuel cell enters the stop period is also determined in advance, and the stop period determining unit determines that “the reference value or more” is occupied during the stop interval. When there are a plurality of periods in which the ratio is equal to or higher than the threshold, it is desirable that among the plurality of periods, only the period in which the ratio of “above the reference value” is the highest is determined to be the suspension period. . This is because even if there are a plurality of periods in which the proportion of “more than the reference value” is high during the stop interval, only one of them is a true stop period.

  Further, in the fuel cell system according to any one of the above aspects, the candidate stopping time zone, which is a time zone that can be a stopping period of the fuel cell, is predetermined. It is preferable that only the time period is a target of the determination as to whether or not it is the stop period. The candidate stop time zone may be set by the convenience of the supply side of the fuel gas used by the fuel cell. In this case, the period corresponding to the time zone shifted from the stop candidate time zone does not completely coincide with the stop period. For this reason, the accuracy of the determination can be further enhanced by adopting this aspect.

  In the fuel cell system according to any one of the above aspects, the error determination unit preferably uses, as a reference value, a value within a range of 0.3 to 0.7 times the rated output of the fuel cell. By doing this, the accuracy of the determination of whether or not the baseline error is equal to or greater than the reference value can be enhanced as much as possible. This also contributes to the determination accuracy of the stop period.

  In the fuel cell system according to another aspect of the present invention, the fuel cell stop determination method includes a fuel cell, a power receiving unit receiving electric power from a power company, and a load unit consuming electric power, and the fuel cell generates electricity The fuel cell system according to the present invention is a fuel cell stop determination method that determines a stop period in which a fuel cell has stopped in a fuel cell system that supplies power to a load unit using power to be supplied and power received by a power receiving unit. Baseline acquisition process for acquiring a baseline, which is a standard pattern of the power received by the mobile unit, and a baseline obtained by subtracting the power at the corresponding time in the baseline from the power actually received by the power receiving unit An error determination process for determining whether the error is a reference value based on the rated output of the fuel cell, and a ratio of “more than the reference value” in the determination by the error determination process The period is a predetermined threshold or more, the fuel cell is due to be performed for determining a stop period determination process that the stop period that has been stopped, a stop determination method for a fuel cell.

  According to this configuration, there is provided a fuel cell system and a fuel cell stop determination method for the fuel cell system that can determine the fuel cell shutdown period with a simple procedure based on data of the amount of purchased power from the electric power company. .

FIG. 1 is a schematic view showing a fuel cell system according to an embodiment. It is a graph which shows an example of the time-lapse pattern of the receiving electric power from an electric power company. It is a graph which shows an example of the time-lapse pattern of a baseline error. It is a graph which shows the probability distribution in which the value of the calculated baseline error appears. It is a graph which shows transition of the sample number whose baseline error is more than a reference value.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. This embodiment is the fuel cell system 7 shown in FIG. 1, and is configured to carry out the fuel cell stop determination method according to the present invention. The fuel cell system 7 is provided in the customer 1 and includes a load unit 2, a fuel cell 3, a power meter 4, a distribution board 9, and an analysis unit 8. The fuel cell system 7 is interconnected with the power company 6 via the system line 5.

  The load unit 2 is a group of lighting, air conditioning, and other power consumption devices in the customer 1. The fuel cell 3 is a cell that generates electric power using a part of gas fuel used as a heat source for hot water supply and cooking in the customer 1. In the fuel cell system 7, the power generated by the fuel cell 3 is used by the load unit 2 to suppress the amount of purchased power from the power company 6. Further, the operation mode of the fuel cell 3 in the fuel cell system 7 is continuous operation at the rated output. However, the fuel cell 3 sometimes has a stop period as described above. Further, the interconnection form between the fuel cell system 7 and the system line 5 is a form in which the reverse power flow to the system line 5 is allowed when the power generated by the fuel cell 3 exceeds the power demand of the load unit 2.

  The distribution board 9 is a part that receives power supply from the power company 6. The distribution board 9 receives power generated by the fuel cell 3 in addition to the power supplied from the power company 6 and supplies the power to the load unit 2. The power meter 4 has a function of measuring the amount of power received from the power company 6. The measurement of the amount of received power is always performed. Thus, for example, a temporal pattern as shown in the graph of FIG. 2 is obtained. The part where the received power amount is negative is the time zone of the reverse power flow state. The analysis unit 8 determines the stop period of the fuel cell 3 based on the data output from the power meter 4. However, data of the amount of received power output by the power meter 4 is temporarily supplied to the analysis unit 8 via the power company 6. Further, since the analysis unit 8 is installed at the operator of the fuel cell system 7, the analysis unit 8 is located outside the customer 1 in FIG. 1.

A method of determining the stop period of the fuel cell 3 in the fuel cell system 7 as described above will be described. The method is implemented by the analysis unit 8 executing the following procedure.
1. Acquisition of baseline 2. Calculation of baseline error Comparison of baseline error with reference value Judgment of stop period based on comparison result

"1. Acquisition of baseline"
A baseline is a standard thing of the time-lapse pattern of the 1st of a receiving amount in the consumer 1. The baseline can be obtained as a pattern of the average received power amount at each time based on the past data of the received power amount as shown in FIG. 2 in the customer 1. Alternatively, a standard pattern in a group of customers equivalent to the customer 1 can be acquired from the power company 6, stored in the analysis unit 8, and used as a baseline. It is also possible to use different baselines for different day attributes, such as day of the week or season. Baselines are generally low at midnight and in the dawn, with high curves from day to evening to midnight. At the baseline of the customer 1 which is provided with the fuel cell 3 and in which the reverse flow is permitted, the value at midnight or in the undawn becomes a negative value.

"2. Calculation of baseline error"
The baseline error is the difference between the received power amount as the actual measurement value actually measured by the power meter 4 and the received power amount data at the same time in the baseline. This is a concept that includes a sign. If the baseline error R (t) is positive, it means that the measured value Wa (t) is larger than the baseline data Wb (t), and if the baseline error R (t) is negative, the measured value Wa (t) t) is smaller than the baseline data Wb (t). That is, assuming that the actual value of the received power amount at time t is Wa (t) and the received power data in the baseline is Wb (t), the baseline error R (t) is expressed by the following equation.
R (t) = Wa (t)-Wb (t)

  The baseline error R (t) is calculated each time the measured value Wa (t) is obtained. Since the actual measurement value Wa (t) is output from the power meter 4 periodically (for example, every 30 minutes, hereinafter referred to as "frame"), the baseline error is each generated with respect to the actual measurement value Wa (t) at each output time. R (t) is calculated. While the baseline is of the pattern as described above, the baseline error R (t) is a line that oscillates randomly up and down around zero. Because of this, it is easier to handle than the baseline itself. An example of a temporal pattern of the baseline error R (t) is shown in FIG.

"3. Comparison of baseline error with reference value"
The reference value referred to here is a threshold for determining whether the value of the baseline error R (t) is considered to be large or small. When the fuel cell 3 is in the stop period, the measured value Wa (t) of the received power amount is larger than that in the normal state because the generated power can not be used. However, the baseline does not consider stopping of the fuel cell 3. Therefore, during the stop period of the fuel cell 3, the baseline error R (t) becomes larger than that during the operation period. It is the reference value that separates this. That is, assuming that the reference value is "B", it is determined which of the following two expressions holds.
R (t) B B
R (t) <B

  This determination is, of course, performed on the calculated baseline error R (t) of each frame. In FIG. 3, the reference value B appears as a straight line parallel to the horizontal axis. If the determination result is "more than the reference value B", naturally, the baseline error R (t) appears above or overlaps with the horizontal line of the reference value B. If the determination result is not "more than the reference value B", the baseline error R (t) is below the horizontal line of the reference value B.

  As the reference value B used here, a value determined in advance based on the rated output of the fuel cell 3 is used. The reason based on the rated output of the fuel cell 3 is that the difference between the actually measured values Wa (t) during the stop period of the fuel cell 3 and during the operation becomes approximately equal to the rated output of the fuel cell 3. That is, it can be said that the baseline error R (t) calculated during the stop period is a value obtained by adding the rated output of the fuel cell 3 by being during the stop period. For this reason, it is preferable to determine the reference value B, which is a threshold value for determining whether or not the engine is in the stop period, based on the rated output of the fuel cell 3.

  Although it is conceivable to use the rated output as the reference value B as it is, it is better to use a smaller value. This is because noise is included in the actual measurement value Wa (t), and the rated output may not be reflected as it is. Specifically, it is preferable to set a value obtained by multiplying the rated output by a positive coefficient smaller than one. The positive coefficient is more preferably a value around 0.5. For example, when the rated output of the fuel cell 3 is 700 W and 0.5 is used as the coefficient, the value of the reference value B is 350 W.

  The coefficients will be further described. The setting of this coefficient affects the accuracy of the determination result for the baseline error R (t). The determination accuracy here is the degree of correlation between the determination result being “more than or equal to the reference value B” and the fact that the baseline error R (t) is during the stop period. . That is, the judgment accuracy is high that there is a strong tendency for the judgment to be "more than or equal to the reference value B" if in the stop period and to be "not more than the reference value B" otherwise. It is. In other words, it is determined that "not more than the reference value B" (F described later) despite being in the stop period, or "it is more than the reference value B" although not in the stop period (G described later) It is an event that the determination accuracy is lowered.

  The higher the coefficient (closer to 1), the higher the probability that the baseline error R (t) obtained during the stop period is determined not to be "above the reference value B". On the other hand, the lower the coefficient (closer to 0), the higher the probability that the baseline error R (t) obtained during operation is determined to be "above the reference value B". This will be described with reference to FIG. FIG. 4 is a graph of the probability distribution of values calculated as the baseline error R (t). The processing in this comparison step is necessary. Whether the calculated baseline error R (t) is on the right of “B” (larger than the reference value B) or on the left in FIG. 4 (less than the reference value B) It is judgment of,. However, during the stop period of the fuel cell 3, it is not the comparison with "B" but with "B-P" (P is the rated output of the fuel cell 3). Because the actual measurement value Wa (t) is increased by the rated output P and the baseline error R (t) is also increased, it is necessary to subtract that amount.

  The occurrence probability of the event that lowers the determination accuracy described above corresponds to the area of the hatched “F” and “G” regions in FIG. Making the sum of the areas of these two areas as small as possible will increase the determination accuracy of the baseline error R (t). For that purpose, the arrow P in FIG. 4 is placed at the center in the left-right direction. The reference value B in that case corresponds to half of the rated output P. This is why the coefficient is set to 0.5 in the above example. Although the probability distribution is drawn as if it were a normal distribution in FIG. 4, the actual probability distribution is not limited to the normal distribution. However, even if it is not a normal distribution, the above holds true if the probability distribution is symmetrical. Since the actual probability distribution is not so extreme extreme asymmetry, the coefficient may be 0.5 as described above. Furthermore, the coefficient does not have to be strictly 0.5. It is practically sufficient if it is within the range of 0.3 to 0.7. It is better if it is within the range of 0.4 to 0.6.

"4. Judgment of stop period based on comparison result"
When the determination on the baseline error R (t) is made as described above, it is possible to determine the stop period. That is, in FIG. 3, it can be said that the section in which the probability that the determination result for the baseline error R (t) is “more than or equal to the reference value B” is a section in which the possibility of being the fuel cell 3 stop period is high. . Thus, such a section is determined to be a stop period. In FIG. 3, the section indicated by the arrow A is a section determined to be the stop period. In section A in FIG. 3, most of the baseline errors R (t) appear above the reference value B. On the other hand, in the sections other than the section A, the probability that the baseline error R (t) is above the reference value B is obviously low. On the other hand, in FIG. 2, although there is a tendency that the actual measurement value Wa (t) of the received power amount is higher in the section A than in the other sections, it is not as clear as in FIG.

Basically, the threshold value for determination is determined in advance. Then, when the ratio of those of “reference value B or more” in all the baseline errors R (t) in the section to be determined is equal to or more than the threshold, the target section is determined to be the stop period. For example, 0.5 can be used as the determination threshold. That is, assuming that the total number of baseline errors R (t) in the target section is K, and the number of those of “more than or equal to the reference value B” is M, and the determination threshold is S, the target section is the stop period. The condition determined to be present is that the following equation is satisfied.
M / K S S

  The determination of the stop period will be further described. Referring to FIG. 3, it is not only the interval A that the baseline error R (t) appears above the reference value B (arrow C). However, it is not always preferable to determine all sections in which the baseline error R (t) is higher than the reference value B as the stop period. Since the stop period is provided for the gas leak inspection as described above, the length is determined by the convenience of the gas supply system and is about 24 hours. Here, the length of the stop period is assumed to be 24 hours. In FIG. 3, the length of the section A is just 24 hours. Except for the section A, any section (arrow C) in which the baseline error R (t) is higher than the reference value B has a length shorter than 24 hours. Therefore, only the section A is determined to be the stop period.

  In FIG. 5, based on the comparison result of the baseline error R (t) and the reference value B in FIG. 3, only the section “more than the reference value B” is hatched. And the curve D is accumulated and shown on it. The curve D shows the transition of the ratio of the section “above the reference value B” in 24 hours thereafter at each time point in FIG. Although the horizontal axis is the passage of time, since one frame is 30 minutes, half of the displayed numbers correspond to the time (60 minutes).

  Looking at the curve D, at the beginning it has been at a low level, but it has risen almost linearly from time D1. This is because the end of "the subsequent 24 hours" takes on the section A, so the ratio of "above the reference value B" rises with time. And, at the start point of the section A, the curve D is the highest. At this time, it is because "the subsequent 24 hours" and the section A coincide, and most of them are "more than the reference value B". After that, conversely, the curve D descends almost linearly. This is because the end of “24 hours thereafter” is out of section A. After the end point of the section A, the curve D is at a low level as in the beginning of FIG.

  From this, in FIG. 5, the time (frame) at which the curve D is peaking may be taken as the beginning of the stopping period, and the frame after 24 hours may be taken as the ending of the stopping period. In this way, it is possible to determine 24 hours, in which the ratio of “above reference value B or more” is the highest, as the stop period. Section A in FIG. 3 is a section determined to fit this.

  In addition, there may be a case where the proportion of “more than or equal to the reference value B” is higher in each of two or more 24-hour sections separated from each other in comparison with the sections before and after that. In such a case, it is not always preferable to determine all of those sections (hereinafter referred to as "high sections") as the stop period. Therefore, the determination of the stop period in such a case will be described.

  There are two high intervals independently, and any of them can be determined as the stop period if the interval between the high intervals and the high intervals is equal to or greater than a predetermined reference interval. As described above, the stop period is provided once in a period of about one month. When the setting frequency of the stop period is once a month, a time period equivalent to about 25 days may be set as the reference interval. If the interval is so long, it is considered that the two independent high sections are both stop periods.

  Conversely, if the interval between the high interval and the high interval is less than the above-mentioned reference interval, the true stop period is considered to be only one of them. In that case, among those high sections, only the one with the highest proportion of “reference value B or more” is determined as the stop period. In such a case, it is considered that the high interval which was not determined to be the stop period only happened that the ratio of “above the reference value B” happened to be somewhat high by chance due to the random appearance of the baseline error R (t) . For this reason, there is often a clear difference in the ratio of “above the reference value B” between the high interval determined to be the stop period and the other high intervals.

  In addition, the start time of one day of the stop period may be fixed at a predetermined time (for example, midnight) by the convenience of the gas supply system. In that case, the time that can be the start point of the section A in FIG. 3 may be limited to the time.

Then, the verification result about the precision of determination of the stop period in the said form is demonstrated. Here, the received power amount data was collected from the power smart meters in a large number of consumers 1 provided with the fuel cell system 7, and the above determination was attempted. The conditions were as follows.
The number of the households: 885 The period: Approximately three months The total number of data: 3, 738, 240 The set stop period: The 26th day of the first month, the 20th day of the second month, the 14th day of the third month 0 o'clock to 24 o'clock)

  As a result, the incidence of false positive was less than 0.04%. In addition, the number of e-mails of customer 1 who had a false positive was only 8 out of the total number of households mentioned above. It was confirmed that a sufficiently high determination accuracy could be obtained.

  As described above in detail, according to the present embodiment, when the measured value Wa (t) of the received power amount is obtained, the baseline error R (t) which is the difference between it and the baseline data Wb (t) It is supposed to be calculated. Then, it is determined whether the baseline error R (t) is equal to or greater than the reference value B. Since this determination is made periodically, it is determined that the period during which the ratio of the frame of the determination result of the reference value B or more is equal to or more than the threshold is the stop period. As a result, a fuel cell system and a fuel cell stop determination method for the fuel cell system can be realized, which can determine the fuel cell shutdown period with a simple procedure based on data of the amount of power purchased from a power company.

  The present embodiment is merely an example and does not limit the present invention. Therefore, the present invention is naturally capable of various improvements and modifications without departing from the scope of the invention. For example, the customer 1 may be a business establishment as well as a residence. Further, in the above-described embodiment, a baseline error R (t) was first calculated in “3. Comparison of baseline error and reference value” and compared with the reference value B. However, the present invention is not limited to this, and the same is true even if it is determined whether it becomes positive or negative by subtracting the sum of the baseline data Wb (t) and the reference value B from the actual measurement value Wa (t).

  Moreover, in FIG. 5, on the premise that the length of the stop period is fixed, the start period of the stop period is first determined, and the end period is determined based on the start period. However, the present invention is not limited to this, and the end of the suspension period may be determined first, and the start may be determined based on the end. Alternatively, when the length of the stop period is not fixed, one of the start or end of the stop period may be determined first, and the other may be determined by finely adjusting the length of the stop period. That is, the other is determined so that the ratio of “above the reference value B” becomes the highest. The analysis unit 8 may be individually installed in each customer 1. In addition, data of the amount of received power may be configured to be supplied directly to the analysis unit 8 from the power meter 4 without passing through the power company 6.

2 load part 3 fuel cell 4 power meter (power receiving part)
7 fuel cell system 8 analysis unit 9 distribution board (power reception unit)

Claims (6)

A fuel cell, a power receiving unit for receiving power from a power company, and a load unit for consuming power, the power generated by the fuel cell and the power received by the power receiving unit are used in combination to the load unit. A fuel cell system that supplies electricity,
A baseline acquisition unit that acquires a baseline that is a standard pattern of the power received by the power reception unit, which is one day;
It is determined whether or not a baseline error, which is the difference between the power actually received by the power receiving unit and the power at the corresponding time in the baseline, is a reference value based on the rated output of the fuel cell or more. Error judgment unit,
A stop period determination unit that determines a period in which the proportion of “more than the reference value” in the determination by the error determination unit is equal to or greater than a predetermined threshold as the stop period in which the fuel cell is stopped Fuel cell system characterized by The fuel cell system according to claim 1, wherein the error determination unit
An error calculation unit that calculates the baseline error;
A fuel cell system comprising: a reference value determination unit that compares the baseline error with the reference value and determines whether the baseline error is equal to or greater than the reference value. The fuel cell system according to claim 1 or 2,
A stop interval, which is the frequency at which the fuel cell enters a stop period, is predetermined.
When there are a plurality of periods in which the proportion occupied by “more than the reference value” is equal to or more than the threshold in the stop interval, the stop period determination unit selects “more than the reference value” among the plurality of periods. A fuel cell system characterized in that it is determined that only the period in which the ratio is the highest is the stop period. A fuel cell system according to any one of claims 1 to 3,
A candidate stop time zone which is a time zone which can be the stop period of the fuel cell is predetermined.
The fuel cell system according to claim 1, wherein the stop period determination unit is configured to determine only a period corresponding to the stop candidate time zone in one day as to whether the stop period is performed. A fuel cell system according to any one of claims 1 to 4,
The fuel cell system according to claim 1, wherein the error determination unit uses a value within a range of 0.3 to 0.7 times the rated output of the fuel cell as the reference value. A fuel cell, a power receiving unit for receiving power from a power company, and a load unit for consuming power, the power generated by the fuel cell and the power received by the power receiving unit are used in combination to the load unit. A fuel cell stop determination method for determining a stop period in which the fuel cell has stopped in a fuel cell system that supplies electric power,
A baseline acquisition process for acquiring a baseline, which is a standard pattern of the power received by the power receiving unit, on a daily basis;
It is determined whether or not a baseline error, which is the difference between the power actually received by the power receiving unit and the power at the corresponding time in the baseline, is a reference value based on the rated output of the fuel cell or more. Error judgment process,
Performing a stop period determination process of determining a period in which the proportion of “more than the reference value” in the determination by the error determination process is equal to or more than a predetermined threshold as the stop period in which the fuel cell has stopped A method for judging stop of a fuel cell in a fuel cell system, characterized in that

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