WO2004082052A1

WO2004082052A1 - Power supply system

Info

Publication number: WO2004082052A1
Application number: PCT/JP2004/002596
Authority: WO
Inventors: Hitoshi Ikuma; Makoto Inoue
Original assignee: The Japan Research Institute, Limited
Priority date: 2003-03-10
Filing date: 2004-03-03
Publication date: 2004-09-23
Also published as: JP3796226B2; JP2004273316A

Abstract

There is provided a power supply system which can easily recognize the current maximum generation capacity. The system includes: a plurality of fuel cells for generating electric power and supplying the power to loads; a performance storage section for storing the maximum power value indicating the maximum power generation value of the respective fuel cells; a test device for successively testing the maximum power generation of at least one fuel cell; an update section for updating the maximum power value of the respective fuel cells stored in the performance storage section according to the performance test result; a generation amount detection section for detecting the total of the generation amounts supplied to the loads by the fuel cells; and a surplus power calculation section for calculating at a predetermined interval a surplus power that can be generated as a surplus by the power supply system according to a difference between the total of the maximum power values stored in the performance storage section and the total of the generation amounts.

Description

Description Power supply system Technical field

The present invention relates to a power supply system that supplies power to a load. In particular, the present invention relates to a power supply system including a plurality of fuel cells. Background art

Conventionally, there is a power supply system that includes a plurality of fuel cells and supplies power to a load. In such a power supply system, the total power supply capacity of the power supply system is given by the sum of the power generation capacity of each fuel cell.

A load whose demand power is smaller than the total power supply capacity is selected and connected to the power supply system. By providing a certain margin in the total power supply capacity of the power supply system with respect to the demand power of the load, power can be supplied to the load stably. The total power supply capacity of the conventional power supply system is calculated from the power generation capacity when each fuel cell is installed. For this reason, it is difficult to know the current total power supply capacity of the power supply system. For example, even when the fuel cell is deteriorated and its power generation capacity is reduced, the total power supply capacity of the power supply system is recognized as the same value as when it was installed.

For this reason, if time has passed since the installation of the power supply system and the power generation capacity of the fuel cell deteriorates, the expected power generation cannot be obtained and the power supplied to the load may be insufficient. For this reason, it was difficult to supply power stably to the load. Also, it was difficult to know how much surplus power generation capacity the power supply system had. Therefore, an object of the present invention is to solve such a problem. DISCLOSURE OF THE INVENTION In order to solve the above problems, in an embodiment of the present invention, an electric power supply for supplying electric power to a load A power supply system, comprising: a plurality of fuel cells that generate power and supply the load to a load; a performance storage unit that stores a maximum power value indicating a maximum value of power generated by each fuel cell; and a predetermined period. A test device for sequentially performing a maximum power generation test of at least one fuel cell for each fuel cell; an updating unit for updating the maximum power value of each fuel cell stored in the performance storage unit in accordance with a result of the performance test; A power supply system based on the difference between the power generation detector that detects the total power generation supplied to the load by the battery, the total of the maximum power values stored in the performance storage unit, and the total power generation And a surplus power calculation unit that calculates surplus power that can generate surplus every predetermined period.

The power supply system determines the fuel cells to be tested by the test device so that the sum of the maximum power values of the selected fuel cells among the plurality of fuel cells is larger than the demand power of the load and the number of selected fuel cells is minimized. A selection unit for selecting one or a plurality of fuel cells and generating electricity, and a selection changing unit for sequentially changing the fuel cells selected by the selection unit at predetermined intervals and causing the test apparatus to test all the fuel cells. Further provision may be made.

The selection unit may preferentially select a fuel cell having a larger maximum power value in addition to the fuel cell to be tested. Further, when the maximum power value of the fuel cell becomes smaller than a predetermined value, it is preferable that the selecting unit does not select the fuel cell.

The power supply system further includes a request receiving unit that receives a request for power from the outside in an emergency, and the selecting unit causes only the fuel cell having a maximum power value smaller than a predetermined value to generate power only in an emergency. The generated power may be supplied to the outside. Further, when an external power requests a power smaller than the surplus power, a control unit that causes the fuel cell to generate power in response to a request from the outside and supplies the power to the outside may be further provided.

The surplus power calculation unit calculates a probability that the power supplied to the load is insufficient based on the surplus power, and if the probability that the power supplied to the load is insufficient exceeds a predetermined value, the excess power calculation unit reports the fact to the outside. May be notified. In addition, the surplus power calculation unit may calculate the probability that the power supplied to the load becomes insufficient based on power transition data that predicts the transition of the demand power of the load.

The performance storage unit may further store the failure probability of each fuel cell, and the surplus power calculation unit may calculate the probability that the power supplied to the load becomes insufficient based on the failure probability. The power supply system supplies a power to a plurality of loads. Further provision may be made.

The power supply system supplies power to multiple loads and uses multiple fuel cells to provide a highly reliable battery group with a maximum power value equal to or higher than a predetermined value and low reliability with a maximum power value lower than a predetermined value. The battery switching section, which is divided into the battery group, and a predetermined important load among multiple loads is connected to the high-reliability battery group, and non-critical loads other than the important load are connected to the low-reliability battery group. And a load control unit.

The battery switching unit divides the plurality of fuel cells into a high-reliability battery group and a low-reliability battery group when the probability of power shortage is equal to or higher than a predetermined probability. If the division divides a plurality of fuel cells into a high-reliability battery group and a low-reliability battery group, it connects a predetermined important load among the multiple loads to the high-reliability battery group, Non-critical loads other than the load may be connected to the low-reliability battery group.

When the total demand power of the critical load is larger than the total power generation of the high reliability battery group, the battery switching unit selects the fuel cell with the highest maximum power generation among the fuel cells belonging to the low reliability battery group with high reliability. It may belong to a battery group.

When the total demand power of the critical load is greater than the total power generation of the high-reliability battery group, the load control unit regards the load with the lowest predetermined importance among the important loads as the non-critical load May be connected to groups.

The power supply system consists of a high-reliability battery network that connects the high-reliability batteries and important loads, and a high-reliability power network that supplies the power generated by the high-reliability batteries to the important loads. A low-reliability power network that is connected and supplies the power generated by the low-reliability battery group to the non-critical loads.

Note that the above summary of the present invention does not enumerate all of the necessary features of the present invention, and a sub-combination of these features may also be an invention. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows an example of a configuration of a power supply system 100 according to an embodiment of the present invention. FIG. 2 shows another example of the configuration of the power supply system 100.

FIG. 3 is a flowchart showing an example of the performance test process of the fuel cell 10. FIG. 4 is a flowchart illustrating an example of the detailed processing of S212. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described through embodiments of the present invention. However, the following embodiments do not limit the invention according to the scope of the patent request. Not all described combinations of features are essential to the solution of the invention. FIG. 1 shows an example of the configuration of a power supply system 100 according to the present invention. In this example, the power supply system 100 includes a load (120 a) provided in each of a plurality of dwellings (110 a, 110 b, 110 c, hereinafter collectively referred to as 110). , 120b, 120c, hereinafter collectively referred to as 120). The power supply system 100 includes a plurality of fuel cells (10 a, 10 b, 10 c, hereinafter collectively referred to as 10), a performance storage unit 60, a test device 40, an update unit 50, and a power generation amount. A detection unit 70, a surplus power calculation unit 80, and a load control unit 92 are provided.

The plurality of fuel cells 10 are provided in each residence 110 corresponding to the plurality of loads 120, and supply power to the plurality of loads 120. For example, a plurality of fuel cells 10 and a plurality of loads 120 are connected to a power network 90, and exchange power between the respective dwellings.

Each load 120 is connected to the electric power network 90 via a switching unit (20a, 20b, 20c, hereinafter collectively referred to as 20). For example, the switching unit 20 supplies power by connecting only the important load 120 to the power network 90 when the power supply of the plurality of fuel cells 10 is insufficient.

The performance storage unit 60 stores the performance value of each fuel cell 10. For example, the performance storage unit 60 stores the maximum power value indicating the maximum value of the generated power of each fuel cell 10. Further, the performance storage unit 60 may further store the failure probability of each fuel cell 10, and may further store the activation time of each fuel cell 10. These values May be stored in advance with a given initial performance value, or a performance value measured by a test may be stored in advance. Further, the performance storage unit 60 may further store the accumulated power generation amount of each fuel cell 10, and the Z or the accumulated operating time.

The power generation amount detection unit 0 detects the power generation amount that each fuel cell 10 supplies to the load 120 and the total amount thereof. The surplus power calculation unit 80 calculates the sum of the maximum power values of the fuel cells 10 stored in the performance storage unit 60 and the power generation amount of the fuel cells 10 detected by the power generation amount detection unit 70. The surplus power that the power supply system 100 can generate surplus is calculated based on the difference from the sum of

The surplus power calculation unit 80 notifies the outside of the calculated surplus power. For example, the user of the power supply system 100 may select a load further connected to the power supply system 100 according to the notified surplus power. Further, when the power supply system 100 is connected to another power supply system, the other power supply system may request the power supply system 100 to have power equal to or less than the surplus power.

The power supply system 100 includes a control unit that, when an external request for power smaller than the surplus power is made, causes the fuel cell 100 to generate power in response to an external request and supply the power to the outside. Further provision may be made. For example, the test device 40 may function as the control unit.

The test apparatus 40 sequentially performs a maximum power generation test of at least one fuel cell 10 at predetermined intervals. That is, the test apparatus 40 performs the maximum power generation test on all the fuel cells 10 by sequentially performing the maximum power generation test on one or a plurality of fuel cells 10 at predetermined intervals. For example, the test apparatus 40 may perform the maximum power generation test at intervals of one week, one month, or the like. The test apparatus 40 selects the fuel cell 10, causes the selected fuel cell 10 to generate electric power, and supplies it to the load 120, and the selection unit 42 and the fuel cell 10 selected by the selection unit 42. And a selection changing unit 4 for changing the setting.

Normally, the selection unit 42 controls the power generation amount of each fuel cell 10 so that the power generation efficiency of the plurality of fuel cells 10 is maximized with respect to the total demand power of the plurality of loads 120. You can do it.

At the time of the test, the selection unit 42 determines that the sum of the maximum power values of the selected fuel cells 10 among the plurality of fuel cells 10 is larger than the sum of the demand powers of the plurality of loads 120, and One or more fuel cells 10 including the fuel cell 10 to be tested are selected to generate power so that the number of selections is minimized. That is, the selector 42 selects one or a plurality of fuel cells 10 to be tested and a fuel cell 10 to be generated according to the power demand of the load 120.

Then, the selection unit 42 causes the fuel cell 10 to be tested to generate maximum power, and causes the other fuel cells 10 to generate power according to the demand power of the load 120. The power generation amount detection unit 70 detects the power generation amount of the fuel cell 10 that is selected to generate the maximum power, and the update unit 50 stores the performance storage unit 60 according to the result of the performance test. The stored performance value of the fuel cell 10 is updated. At this time, the power generation amount detection unit 70 may further detect the startup time of the fuel cell 10 and cause the updating unit 50 to update the startup time of the fuel cell 10.

Further, the power generation amount detection unit 70 may detect the power generated by the fuel cell 10 that is generating the maximum power, in addition to the fuel cell 10 selected to be tested. In this case, the performance value of the fuel cell 10 can also be updated. In addition, the selecting unit 42 controls the power generation amount of each of the fuel cells 10 so that the number of the fuel cells 10 that generate the maximum power is maximized also in the other fuel cells 10. Is preferred. In other words, the selection unit 42 selects the maximum number of fuel cells 10 that do not exceed the total power demand of the load 120, including the fuel cells 10 to be tested, and selects the selected fuel. The fuel cell 10 which should cause the battery 10 to generate the maximum power and generate the insufficient power may be further selected. In addition, the selection unit 4'2 may preferentially select the fuel cell 10 having a large maximum power value stored in the performance storage unit 60 in addition to the fuel cell 10 to be tested. By preferentially selecting and using the fuel cells 10 with high performance, the deterioration of each fuel cell 10 can be made uniform.

In addition, the selection unit 42 may cause the fuel cell 10 selected at the time of the test to continuously generate power even during normal times. In this case, the selection change unit 44 sequentially changes the fuel cells 10 selected by the selection unit 42 every predetermined period in which the test is to be performed, and causes the test apparatus 40 to test all the fuel cells 10. .

When the performance value stored in the performance storage unit 60 is updated, that is, for each predetermined period to be tested, the surplus power calculation unit 80 calculates the surplus power that the power supply system 100 can generate in excess. I do. With such an operation, the test can be performed without disconnecting the fuel cell 10 to the load 120. For this reason, each fuel cell 10 can be tested while supplying power stably to the load 120. For example, the fuel cell 10 can be tested even during the daytime when the power demand of the load 120 increases. In addition, the current maximum power generation capacity of the power supply system 100 can be constantly grasped, and the surplus power generation capacity of the power supply system 100 can be constantly grasped.

Further, as a result of the test, when the performance value of the fuel cell 10 becomes smaller than the predetermined value, the selection unit 42 preferably does not select the fuel cell 10. For example, when the maximum power value of the fuel cell 10 becomes smaller than a predetermined value, the reliability of the fuel cell 10 is also deteriorated accordingly, so that the fuel cell 10 is not affected during normal power generation. It is preferable not to use. In this case, it is preferable that the power supply system 100 notifies the user that the replacement of the fuel cell 10 is urged.

If the fuel cell 10 whose performance value has become smaller than the predetermined value has not been replaced, the selector 42 causes the fuel cell 10 to generate power only in an emergency, and the fuel cell 10 generates power. Electric power may be supplied to the outside. For example, the fuel cell 10 is caused to generate power only when an external power request is received in an emergency such as a disaster. In this case, the selection unit 42 functions as a request reception unit that receives a power request from the outside. As a result, the fuel cell 10 whose performance has deteriorated can be used effectively. When supplying power to the outside, the switching unit 30 connects the power network 90 and an external load.

Further, the surplus power calculation unit 80 calculates a probability that the power supplied to the load 120 is insufficient based on the calculated surplus power, and when the probability exceeds a predetermined value, notifies the fact. It is preferable to notify the outside. The probability that the power supplied to the load 120 becomes insufficient can be easily calculated from the surplus power and the failure probability of each fuel cell 10. Further, the surplus power calculating unit 80 may calculate the probability that the power supplied to the load 120 becomes insufficient based on the power transition data that predicts the transition of the demand power of the load 120. The power transition data may be data that is given in advance based on the past transition of the demand power of the load 120.

The user can disconnect the desired load 120 from the power network 90 when notified that the power is likely to be insufficient. In addition, the load controller 92 When the addition probability is equal to or higher than the predetermined probability, the corresponding switching unit 20 may be controlled so as not to supply power to a predetermined insignificant load among the plurality of loads 120. The load controller 92 reduces the total power demand of the load 120 by cutting off the non-essential load, thereby increasing the surplus power and reducing the probability of a power failure. FIG. 2 shows another example of the configuration of the power supply system 100. The power supply system 100 in the present example is different from the power supply network 100 of the power supply system 100 described in FIG. 1 in that the high-reliability power network 90 a and the low-reliability power network 0b, and further includes a control unit 94, a switching unit 22, and a battery switching unit 26.

The unreliable power network 90a receives power from external power sources. The external power source is a power source that externally supplies power to the low-reliability power network 90a. For example, the external power source is another power supply system 100 or a commercial power supply. The high reliability power network 90b is a power network provided independently of the low reliability power network 90a.

The plurality of fuel cells 10 and the plurality of loads 120 are connected to either the high reliability power network 90a or the low reliability power network 90b.

The control unit 94 determines whether the external power source is operating normally based on the power supplied from the external power source to the low reliability power network 90b. When the control unit 94 determines that the operation of the external power source is normal, the switching unit 22 and the battery switching unit 26 have low reliability for the plurality of fuel cells 10 and the plurality of loads 120. Power supply network 90b to supply power from an external power source and a plurality of fuel cells 10 to a plurality of loads 120.

When the control unit 94 determines that the operation of the external power source is abnormal, the switching unit 22 and the battery switching unit 26 provide a plurality of fuel cells 10 and a plurality of loads 1 2 0 is connected to the high-reliability electric power network 90a, and power is supplied from the plurality of fuel cells 10 to the plurality of loads 120. The switching unit 22 has a plurality of switching means 20 for switching the connection of the plurality of loads 120, and the battery switching unit 26 has a plurality of switching units for switching the connection of the plurality of fuel cells 10. It has switching means 24.

In other words, at least one of the plurality of fuel cells 10 constantly supplies power to the load 120 I do. Therefore, the test of the fuel cell 10 described with reference to FIG. 1 can be performed efficiently. Further, by such control, the external power source and the fuel cell 10 can be connected to another network in the event of an abnormality. Therefore, when the external power source is abnormal, reverse flow of power from the fuel cell 10 to the external power source can be prevented, and at least one fuel cell 10 can be operated at all times.

As described above, according to the power supply system 100 in this example, the test of the fuel cell 10 can be performed efficiently.

Also, when power is mainly supplied from the plurality of fuel cells 10 to the plurality of loads 120 and power is received from the outside in an auxiliary manner, the battery switching unit 26 controls the plurality of fuel cells 10 Based on these performance values, the high reliability battery group and the low reliability battery group are divided. For example, the battery switching unit 26 may include a plurality of fuel cells 10, a high-reliability battery group having a maximum power value equal to or higher than a predetermined value, and a low-reliability battery having a maximum power value smaller than the predetermined value. In particular, connect the high-reliability battery group to the high-reliability power network 90a, and connect the low-reliability battery group to the low-reliability power network 90b.

In addition, the load control unit 92 connects a predetermined important load among the plurality of loads 120 to the high-reliability power network 90a, and transfers non-critical loads other than the important load to the low-reliability power network. Connect to network 90 b. As a result, the high-reliability battery network 90a is connected to the high-reliability battery group and the important load, and the power generated by the high-reliability battery group is supplied to the important load. In addition, a low-reliability battery group and a non-critical load are connected to the low-reliability power network 90b, and the power generated by the low-reliability battery group is supplied to the non-critical load.

In addition, when the probability that the power calculated by the surplus power calculation unit 80 becomes insufficient becomes equal to or higher than a predetermined probability, the battery switching unit 26 sets the plurality of fuel cells 10 as a high reliability battery group and a low reliability battery group. It may be separated from the battery group. In this case, when the battery switching unit 26 divides the plurality of fuel cells into the high-reliability battery group and the low-reliability battery group, the load control unit 92 A predetermined important load is connected to the high reliability battery group, and non-critical loads other than the important load are connected to the low reliability battery group.

In addition, when the total demand power of the critical load is larger than the total power generation of the high-reliability battery group, the battery switching unit 26 generates the highest power generation among the fuel cells 10 belonging to the low-reliability battery group. The large fuel cell 10 may belong to a high reliability cell group. In this case, the battery switching unit 26 controls the fuel cells with high power generation from the low-reliability battery group to the high-reliability battery group until the total power generation of the high-reliability Change 10 sequentially. Further, when the total demand power of the important load is larger than the total power generation of the high-reliability battery group, the load control unit 92 removes the load 120 having the predetermined lowest importance among the important loads. It may be connected to a low reliability battery group as an important load. In this case, since the total demand power of the important loads becomes smaller than the total power generation of the high-reliability battery group, the load control unit 92 sequentially switches the important loads of lower importance to the non-important loads. With such an operation, it is possible to stably supply power to important loads.

The importance of each load 120 may be determined in advance by the user, and the importance may change with time. For example, the importance of each load 120 may change in the daytime and nighttime, in each season, and the like. FIG. 3 is a flowchart illustrating an example of a performance test process of the fuel cell 10. First, the selection unit 42 normally selects the fuel cell 10 to generate power (S200), and power is supplied to the load 120 (S202). Next, it is determined whether or not a predetermined period has elapsed since the previous performance test (S204), and if the predetermined period has not elapsed, the time from the selected fuel cell 10 is determined. Continue power supply (S202). If the predetermined period has elapsed, the selection unit 42 selects one or a plurality of fuel cells 10 including the fuel cell 10 to be tested and generates power (S206).

Next, the power generation amount detection unit 70 detects operation data such as the power generation amount and the start-up time of the fuel cell under test (S208). Then, the updating unit 50 updates the performance value stored by the performance storage unit 60 based on the detected operation data (S210). At this time, it is determined whether the performance value of the fuel cell or the power failure probability indicates an abnormal value, and if not, the power supply from the selected fuel cell 10 is continued (S 2 0 2) ₀

If an abnormal value is detected in S212, the fact is notified to the outside (S2114). For example, in S2114, a message to replace the fuel cell that has detected the abnormal value is notified to the outside, and the process is terminated. FIG. 4 is a flowchart showing an example of the detailed process of S212. First, the detected operation data of the fuel cell 10 is compared with a reference value (S300). Then, it is determined whether or not the operation data of the fuel cell 10 indicates an abnormal value (S302). If the operation data indicates an abnormal value, the fuel cell 10 is exchanged as described with reference to FIG. Is notified to the outside (S2114).

If no abnormal value is detected in S302, the surplus power of the power supply system 100 is calculated based on the updated performance values, and the power failure probability that the power supply of the power supply system 100 is insufficient is calculated. Yes (S304). Then, when the power failure probability is larger than the abnormal value, that is, the predetermined reference value, the fact is notified to the outside (S2114). If the power failure probability is smaller than the reference value, the process from S202 is continued.

As described above, the present invention has been described using the embodiment, but the technical scope of the present invention is not limited to the scope described in the above embodiment. It is obvious to those skilled in the art that various changes or improvements can be added to the above-described embodiment. It is apparent from the description of the claims that embodiments with such changes or improvements can be included in the technical scope of the present invention. Industrial applicability

As is apparent from the above description, according to the power supply system of the present invention, a plurality of fuel cells can be efficiently tested while supplying power stably to the load, and the current maximum power generation capacity Can be easily grasped.

Claims

The scope of the claims

1. A power supply system for supplying power to a load,

A plurality of fuel cells that generate power and supply it to the load;

A performance storage unit for storing a maximum power value indicating a maximum value of the power generated by each of the fuel cells;

A test apparatus for sequentially performing a maximum power generation test of at least one of the fuel cells for each predetermined period;

An update unit that updates the maximum power value of each of the fuel cells stored in the performance storage unit according to a result of the performance test;

A power generation amount detection unit that detects a total amount of power generation supplied to the load by the fuel cell; a difference between a total of the maximum power values stored by the performance storage unit and a total of the power generation amounts; A surplus power calculation unit that calculates surplus power that the power supply system can generate surplus for each predetermined period based on

A power supply system comprising:

2. The test device to be tested by the test apparatus such that the sum of the maximum power values of the selected fuel cells among the plurality of fuel cells is larger than the demand power of the load and the number of selections is minimized. A selection unit that selects one or a plurality of the fuel cells including a fuel cell to generate power,

A selection change unit that sequentially changes the fuel cells selected by the selection unit for each of the predetermined periods, and causes the test apparatus to test all of the fuel cells;

The power supply system according to claim 1, further comprising:

3. The power supply system according to claim 2, wherein the selection unit preferentially selects the fuel cell having the larger maximum power value in addition to the fuel cell to be tested.

4. If the maximum power value of the fuel cell is smaller than a predetermined value, 3. The power supply system according to claim 2, wherein the selector does not select the fuel cell.

5. The apparatus further includes a request receiving unit that receives a request for power from outside in an emergency, wherein the selecting unit causes the fuel cell to generate power only when the maximum power value is smaller than the predetermined value only in an emergency, and The power supply according to claim 4, wherein the power generated by the battery is supplied to the outside.

6. When a request for power is received from the outside that is smaller than the surplus power, a control unit that supplies power to the outside by causing the fuel cell to generate power in response to the request from the outside is further provided. The power supply system according to claim 1, wherein

7. The surplus power calculation unit calculates a probability that the power supplied to the load is insufficient based on the surplus power, and when the probability that the power supplied to the load is insufficient exceeds a predetermined value. 2. The power supply system according to claim 1, wherein a notification to that effect is sent to the outside.

8. The surplus power calculation unit calculates a probability that the power supplied to the load becomes insufficient based on power transition data that predicts a transition of demand power of the load. 7. The power supply system according to 7.

9. The performance storage unit further stores a failure probability of each of the fuel cells, and the surplus power calculation unit calculates a probability that the power supplied to the load becomes insufficient based on the failure probability. The power supply system according to claim 7, wherein

10. The power supply system supplies power to the plurality of loads, and when the probability of the power shortage is equal to or greater than a predetermined probability, the power is supplied to a predetermined non-critical load among the plurality of loads. The power supply system according to any one of claims 7 to 9, further comprising a load control unit that does not supply the power.

1 1. The power supply system supplies power to the plurality of loads,

A battery switching unit that divides the plurality of fuel cells into a highly reliable battery group in which the maximum power value is equal to or more than a predetermined value; and a low reliability battery group in which the maximum power value is smaller than the predetermined value.

A load control unit that connects a predetermined important load among the plurality of loads to the high-reliability battery group, and connects a non-critical load other than the important load to the low-reliability battery group. The power supply system according to any one of claims 7 to 9, wherein:

12. The battery switching section separates the plurality of fuel cells into the high-reliability battery group and the low-reliability battery group when the probability of the power shortage is equal to or higher than a predetermined probability. ,

The load control unit, when the battery switching unit divides the plurality of fuel cells into the high-reliability battery group and the low-reliability battery group, a predetermined one of the plurality of loads. The power supply system according to claim 11, wherein an important load is connected to the high reliability battery group, and a non-critical load other than the important load is connected to the low reliability battery group.

13. The battery switching unit, when the total demand power of the important load is larger than the total power generation of the high reliability battery group, the maximum power generation of the fuel cells belonging to the low reliability battery group. 12. The power supply system according to claim 11, wherein the fuel cell having the largest power belongs to the high reliability battery group.

14. The load controller, when a total demand power of the important load is larger than a total power generation of the high-reliability battery group, the load having a predetermined lowest priority among the important loads. The power supply system according to claim 11, wherein the power supply system is connected to the low reliability battery group as the non-critical load.

15. A high-reliability power network to which the high-reliability battery group and the important load are connected, and which supplies the power generated by the high-reliability battery group to the important load;

The low-reliability battery group and the non-critical load are connected, and a low-reliability power network for supplying power generated by the low-reliability battery group to the non-critical load;

The power supply according to claim 11, further comprising: