JP5676847B2 - Fuel cell power supply - Google Patents

Description

  The present invention relates to a fuel cell power supply device including a fuel cell and a DC power storage device, and more particularly to a fuel cell power supply device including a DC-DC exchanger that adjusts the voltage of DC power from the fuel cell.

In recent years, fuel cell power generators have been developed due to increased interest in energy saving, CO ₂ emission reduction, and the like, and their application to stationary distributed power sources is progressing. Since it is difficult for the fuel cell power generation system to rapidly change the power generation output, the fuel cell power generation system is generally operated by being connected to a commercial power system. Further, in the case of operating independently from a commercial power system, there has been proposed a fuel cell power supply device that combines a fuel cell and a DC power storage device and uses both to supply power to a load (for example, Patent Documents). 1).
JP 2001-231176 A

  However, the conventional fuel cell power supply device has the following problems. In other words, the power generation efficiency of the fuel cell has a characteristic that the lower the power generation output, the lower the efficiency, and the higher the power generation output, the higher the efficiency. Since the power generation amount of the fuel cell was determined, the power generation efficiency was lowered when the power consumption of the load decreased and the power generation output of the fuel cell decreased.

  Therefore, the fuel cell can always perform highly efficient power generation operation regardless of load fluctuations, and even when the power consumption of the load decreases or increases, power generation operation can be performed at the highest efficiency without causing abnormalities in the power supply. The development of a reliable fuel cell power supply that can be performed has been eagerly desired.

  The present invention has been made to solve the above-described problems of the prior art, and its purpose is to provide reliable power that can always supply highly efficient power regardless of load fluctuations. The object is to provide a high fuel cell power supply.

In order to achieve the above object, a fuel cell power supply apparatus according to the present invention includes a fuel cell that generates DC power by an electrochemical reaction between a fuel gas and an oxidant gas, and a DC-DC converter that adjusts the voltage of the DC power. A DC power storage device that stores the DC power, a power conversion device that converts the DC power into DC or AC power and supplies it to a load, and auxiliary power that supplies power to an auxiliary machine required for power generation of the fuel cell A DC bus connected to the supply device, the DC-DC converter, the DC power storage device, the power converter, and the auxiliary power supply device, and the DC of the DC-DC converter according to the power consumption of the load A control device for changing an output set value of power; a charge / discharge current measuring device for measuring a charge / discharge current of the DC power storage device; and a voltage measuring device for measuring a voltage of the DC bus. Of the load When the average power consumption is within a predetermined range, if the total power consumption of the load and the auxiliary machine is smaller than the output power that allows the fuel cell to obtain a predetermined power generation efficiency, the output set value is When the fuel cell is increased to a value that is equal to or greater than the amount of output power at which a predetermined power generation efficiency can be obtained, the value is set as a new output setting value, and the average power consumption of the load is below the lower limit value of the predetermined range In this case, when at least one of the voltage of the DC bus or the charging current of the DC power storage device deviates from the respective upper limit value, both the voltage of the DC bus and the charging current of the DC power storage device are the upper limit values. The output set value of the DC-DC converter is lowered so as to be less than.

According to the present invention having the above-described configuration, when the average power consumption of the load is within a predetermined normal range, in other words, during normal operation, it is always greater than the total power consumption consumed by the load and the auxiliary equipment. And since it can control to output the electric power which becomes more than predetermined power generation efficiency, efficient operation is always possible. Further, even when the average power consumption of the load decreases from a lower limit value of a predetermined normal range, it is possible to continue power generation with a power generation output that is the upper limit value of the charging current of the DC power storage device or the voltage of the DC bus. Therefore, the most efficient power generation operation can be performed without causing abnormality of the fuel cell power supply device.

The present invention also deviates the fuel cell power supply device according to claim 1, the average power consumption of the previous SL load, in the case where the upper limit of the predetermined range, the voltage of the DC bus is the lower limit value Or when the discharge current of the DC power storage device deviates from the upper limit value, the control device causes the voltage of the DC bus to be equal to or higher than the lower limit value, and the discharge current of the DC power storage device is higher than the upper limit value. The output set value of the DC-DC converter is increased so as to be less than the value.

  According to the present invention having the above-described configuration, even when the average power consumption of the load is increased from the upper limit value of the predetermined normal range, the fuel cell power supply apparatus is not caused abnormally and highly efficient. Power generation operation is possible.

  According to the present invention, it is possible to provide a highly reliable fuel cell power supply device that can always supply highly efficient power regardless of load fluctuations. More specifically, in a fuel cell power supply device that generates electricity with constant power during normal times, the fuel cell can be used regardless of load fluctuations by appropriately changing the output set value output to the DC-DC converter. Highly efficient power generation operation is always possible. Furthermore, to provide a highly reliable fuel cell power supply device that can perform power generation operation with the highest efficiency without causing abnormality of the fuel cell power supply device even when the average power consumption of the load is reduced or increased. Can do.

  Embodiments of a fuel cell power supply device according to the present invention will be described below with reference to the drawings.

(1) First Embodiment (1-1) Configuration FIG. 1 is a block diagram showing a configuration of a first embodiment of a fuel cell power supply device according to the present invention. That is, in the fuel cell power supply device of the present embodiment, a DC-DC converter 6 that adjusts the voltage of the DC power of the fuel cell 1 is connected to the fuel cell 1, and a DC bus 5 that is an output line of the DC-DC converter 5 DC power storage device 2 for storing DC power, power conversion device 3 for converting DC power to DC or AC power and supplying the load to the load, and auxiliary power supply device for supplying power to the auxiliary equipment required for power generation of the fuel cell 12 is connected.

  A voltage measuring instrument 10 for measuring the voltage of the DC bus 5 is connected to the output side of the DC-DC converter 6, and the charge / discharge current is supplied to the input / output portion of the DC power storage device 2. A charge / discharge current measuring instrument 7 to be measured is connected. In addition, a load 4 is connected to the output side of the power converter 3 and at least one of a current measuring instrument 9 or a power measuring instrument 11 is connected. An auxiliary machine 13 is connected to the output side of the auxiliary machine power supply device 12.

  Further, the fuel cell power supply device of the present embodiment is provided with a control device 100 having a configuration as shown in FIG. 2, and in order to appropriately control the DC power amount output by the DC-DC converter 6, the DC output A setting value (hereinafter referred to as an output setting value) can be changed as appropriate.

  That is, in the control device 100, as shown in FIG. 2, the data acquisition unit 101, the calculation unit 102, the determination unit 103, and the output setting value that acquire measurement values from each measuring device to be monitored are set to appropriate values. A setting unit 104 for changing the setting, an output unit 105 for outputting the output set value to the DC-DC converter 6 and a storage unit 106 are provided. In the present embodiment, the charge / discharge current measuring device 7, the voltage measuring device 10, the current measuring device 9, and the power measuring device 11 are monitored, and these measured values are input to the data acquisition unit 101. It is configured as follows.

(1-2) Operation The fuel cell power supply device of the present embodiment having the above-described configuration operates as follows. That is, the voltage of the DC power of the fuel cell 1 is adjusted by the DC-DC converter 6 based on the output set value set by the processing by the control device 100 as described later, and is output to the DC bus 5. .

  In addition, the power conversion device 3 converts the direct current of the direct current bus 5 into alternating current or direct current of a voltage required by the load, and supplies it to the load 4. At this time, when the load 4 fluctuates and exceeds a certain output power of the DC-DC converter 6, insufficient power is supplied from the DC power storage device 2. On the other hand, when the load 4 falls below the constant output power of the DC-DC converter 6, surplus power is stored in the DC power storage device 2. The auxiliary machine power supply device 12 converts the voltage of the DC bus 5 into DC power of a voltage required by the auxiliary machine, and supplies the power required by the auxiliary machine 13.

  Subsequently, with regard to the setting change process of the output set value by the control device 100, the average power consumption of the load 4 has decreased from the normal range during normal times (when the average power consumption of the load 4 is within a preset normal range). The case will be described separately when the average power consumption of the load 4 increases from the normal range.

(1-2-1) Normal Operation First, the normal operation will be described.
As shown in FIG. 4, the fuel cell 1 outputs DC power based on the output set value output from the setting unit 104 of the control device 100 to the DC-DC converter 6 (step 401). The output set value at the start of the fuel cell 1 is stored in the storage unit 106 as an initial power set value, which is set in advance for each fuel cell power supply so that highly efficient power generation is possible. It is a value determined by the power generation output determined that no surplus or insufficient power is generated from the past load power.

  In a state where power generation by the fuel cell is continued based on the initial power setting value, the data acquisition unit 101 performs charge / discharge current measuring device 7, voltage measuring device 10, current measuring device 9, power to be monitored. The measurement value of the measuring instrument 11 is acquired (step 403). Subsequently, in the calculation unit 102, the average power consumption of the load 4 is calculated from the measured value of the current measuring device 9 or the power measuring device 11 (step 404).

  Subsequently, in the determination unit 103, it is determined whether or not the average power consumption of the load 4 is within a predetermined normal range (step 405). If it is determined that the average power consumption is within the normal range, the process proceeds to step 406. The unit 102 calculates the total value of the average power consumption of the load 4 and the power consumption consumed by the fuel cell internal auxiliary device 13 during normal operation. In addition, since the power consumption of the fuel cell internal auxiliary machine 13 becomes a substantially constant value depending on the power generation output, it can be a fixed numerical value or a function determined according to the power generation output. It is not necessary to use the measured value by the instrument.

  Subsequently, the determination unit 103 determines whether or not the total power consumption is larger than the power generation output P1 when the predetermined power generation efficiency T1 shown in FIG. 3 is reached (step 407). Since this means that the operation is efficient, the process returns to step 402 and the above-described processing is repeated.

  On the other hand, when it is determined that the total power consumption is smaller than the power generation output P1 when the predetermined power generation efficiency T1 is reached, the setting unit 104 increases the output set value by, for example, 100 W as a new output set value ( Step 408), returning to step 402, the above-described processing is repeated.

  Here, the relationship between the power generation efficiency of the fuel cell and the power generation output will be described. That is, as shown in FIG. 3, in general, the power generation efficiency of the fuel cell decreases as the power generation output decreases, and increases as the power generation output increases, so the output set value is the power generation efficiency T1. It is preferable that the generated power output P1 or more. From this point of view, in this embodiment, it is determined whether or not the total power consumption is larger than the power generation output P1 when the power generation efficiency T1 is reached, so that the power generation efficiency T1 or more can always be maintained. It is configured.

(1-2-2) Operation when the average power consumption of the load 4 decreases Next, the operation when the average power consumption of the load 4 decreases from the lower limit value of the normal range will be described. That is, if it is determined in step 405 in FIG. 4 that the average power consumption of the load 4 is not within the normal range, the process proceeds to step 409 in FIG. 5 where the average power consumption of the load 4 is less than the lower limit value of the normal range. It is determined whether or not it is decreasing. Thus, when the average power consumption of the load 4 decreases from the lower limit of the normal range, surplus power increases, the charging current of the DC power storage device 2 increases, and the voltage of the DC bus 5 increases.

  If it is determined in step 409 that the average power consumption of the load 4 is lower than the lower limit value of the normal range, is the charging current measured by the charge / discharge current measuring instrument 7 exceeding the upper limit value? Next, it is determined whether or not the voltage of the DC bus 5 measured by the voltage measuring instrument 10 exceeds the upper limit value (step 411).

  In step 410 and step 411, when the charging current of the DC power storage device 2 or the voltage of the DC bus 5 exceeds the respective upper limit value, the output setting value is lowered by the setting unit 104 so as to be lower than the upper limit value. (Step 412), the process returns to Step 402.

  According to the logic as described above, according to the characteristics shown in FIG. 3, the power generation efficiency slightly decreases with the decrease in the power generation output of the fuel cell, but the upper limit value of the charging current of the DC power storage device 2 or the voltage of the DC bus 5 Therefore, it is possible to continue the power generation with the generated power output, so that the most efficient power generation operation can be performed without causing the abnormality of the power supply device.

(1-2-3) Operation when the average power consumption of the load 4 increases Next, the operation when the average power consumption of the load 4 increases from the upper limit value of the normal range will be described. When the average power consumption of the load 4 increases from the upper limit value of the normal range, the remaining capacity of the DC power storage device 2 decreases.

  That is, in step 409 of FIG. 5, when it is determined that the average power consumption of the load 4 has increased from the upper limit value of the normal range, the process proceeds to step 413 and is measured by the charge / discharge current measuring instrument 7. It is determined whether or not the discharge current exceeds the upper limit value (step 413). Subsequently, it is determined whether or not the voltage of the DC bus 5 measured by the voltage measuring instrument 10 is lower than the lower limit value. (Step 414).

  In step 413 and step 414, when the discharge current of DC power storage device 2 exceeds the upper limit value, the voltage of DC bus 5 is lower than the lower limit value. If the value is lower than the lower limit, the setting unit 104 increases the output set value (step 415) and returns to step 402.

  According to this logic as described above, since the power generation output of the fuel cell is in the direction of increase, the power generation efficiency is in the direction of increase as shown in FIG. Efficient power generation operation is possible.

(1-3) Effect As described above, according to the present embodiment, in normal operation, the output set value output to the DC-DC converter 6 is a constant value that is equal to or higher than a predetermined power generation efficiency. Therefore, the fuel cell 1 can always perform a highly efficient power generation operation regardless of fluctuations in the load 4. Furthermore, even when the average power consumption of the load 4 is reduced or increased, the power generation operation with the highest efficiency is possible without causing the abnormality of the power supply device. In addition, since power is generated with constant power during normal times, the reliability of operation of the fuel cell power generator is improved.

(2) Configuration of the Second Embodiment (2-1) This embodiment is a modification of the first embodiment, and as shown in FIG. 8 is installed. In the present embodiment, the charge / discharge power measuring instrument 8, the voltage measuring instrument 10, the current measuring instrument 9, and the power measuring instrument 11 are monitored, and these measured values are the data acquisition unit 101 of the control device 100. It is comprised so that it may be input. Since other configurations are the same as those of the first embodiment, description thereof will be omitted.

(2-2) Operation (2-2-1) Normal Operation Since the normal operation is the same as that of the first embodiment, description thereof is omitted.

(2-2-2) Operation when the average power consumption of the load 4 is reduced When it is determined in step 409 in FIG. 7 that the average power consumption of the load 4 is lower than the lower limit value of the normal range. The calculation unit 102 calculates an integrated value of the amount of charging power measured by the charging / discharging power measuring instrument 8 (step 420). Subsequently, it is determined whether or not the integrated value of the charged electric energy exceeds a predetermined upper limit value (step 421).

  In step 421, if it is determined that the integrated value of the charging power amount of the DC power storage device 2 exceeds the predetermined power amount, it indicates that surplus power is generated in the DC power storage device 2. Therefore, the setting unit 104 changes the output setting value to a value obtained by subtracting the average surplus power calculated from the integrated value of the charging power amount (step 422), and returns to step 402.

  As a result, it is possible to prevent deviation from the upper limit values of the input voltage and the charging current of the DC power storage device 2. Further, according to the characteristics shown in FIG. 3, although the power generation efficiency slightly decreases with a decrease in the power generation output of the fuel cell, it is possible to prevent an abnormality of the power supply device due to an increase in surplus power. Can continue.

(2-2-3) Operation when the average power consumption of the load 4 increases When it is determined in step 409 in FIG. 7 that the average power consumption of the load 4 is higher than the upper limit value of the normal range The calculation unit 102 calculates an integrated value of the amount of discharge power measured by the charge / discharge power meter 8 (step 423). Subsequently, it is determined whether or not the integrated value of the discharge electric energy exceeds a predetermined upper limit value (step 424).

  If it is determined in step 424 that the integrated value of the discharge power amount of the DC power storage device 2 has increased beyond the predetermined power amount, it indicates that there is insufficient power in the DC power storage device 2. Therefore, the setting unit 104 changes the output set value to a value obtained by adding the insufficient power calculated from the integrated value of the discharge power (step 425), and returns to step 402.

  As a result, it is possible to prevent a deviation from the lower limit value of the input voltage or the upper limit value of the discharge current of the DC power storage device 6. Further, according to the characteristics shown in FIG. 3, the power generation efficiency is improved with an increase in the power generation output of the fuel cell, so that a highly efficient operation equivalent to or higher than the normal operation is possible.

(2-3) Effect As described above, according to the present embodiment, the surplus power generated when the load 4 is continuously reduced for a long time is detected, and the output setting is output to the DC-DC converter 6. By changing the value to a value obtained by subtracting the surplus power calculated from the integrated value of the charging power, it is possible to prevent deviation from the upper limit values of the input voltage and the charging current of the DC power storage device. As a result, the power generation operation can be performed with the highest efficiency under conditions that do not cause an abnormality in the power supply device.

  On the other hand, an insufficient power generated when the increase state of the load 4 continues for a long time is detected, and the output set value output to the DC-DC converter 6 is added to the insufficient power calculated from the integrated value of the discharge power. By changing to the above value, it is possible to prevent deviation from the lower limit value of the input voltage or the upper limit value of the discharge current of the DC power storage device. As a result, high-efficiency operation equivalent to or higher than normal operation is possible.

(3) Third Embodiment (3-1) Configuration This embodiment is a modification of the first embodiment, and in the first embodiment, the average power consumption of the load 4 is the lower limit of the normal range. The output set value is lowered so that the charging current of the DC power storage device 2 and the voltage of the DC bus 5 are lower than the respective upper limit values when it is further reduced. In this embodiment, the power generation efficiency is further taken into consideration. Is.

  That is, in this embodiment, the power generation efficiency calculated by the calculation unit 102 using the consumption amount of raw fuel gas such as city gas or propane gas used by the fuel cell for power generation and the power consumption of the load 4 is predetermined. When the power generation efficiency is below the minimum power generation efficiency, power generation is stopped. In addition, since the structure of the fuel cell power supply device of this embodiment is the same as that of the said 1st Embodiment, description is abbreviate | omitted.

(3-2) Action The normal operation and the operation when the average power consumption of the load 4 is increased from the upper limit value of the normal range are the same as those in the first embodiment, and a description thereof will be omitted.

  Next, an operation when the average power consumption of the load 4 is reduced from the lower limit value of the normal range will be described. That is, as shown in FIG. 8, as in the first embodiment, when the charging current measured by the charging / discharging current measuring instrument 7 exceeds the upper limit in step 410, or in step 411, the voltage is measured. When the voltage of the DC bus 5 measured by the battery 10 exceeds the upper limit value, the output set value is lowered so that the charging current of the DC power storage device 2 and the voltage of the DC bus 5 are lower than the upper limit value. Processing is performed (step 412).

  In this embodiment, following this process, the power generation efficiency is calculated by the calculation unit 102 using the consumption of raw fuel gas such as city gas and propane gas used by the fuel cell for power generation and the power consumption of the load. (Step 430). Subsequently, it is determined whether or not the power generation efficiency is greater than a predetermined minimum power generation efficiency (step 431). If the power generation efficiency is higher, the process returns to step 402 in FIG. On the other hand, when the power generation efficiency is smaller than the predetermined minimum power generation efficiency, since efficient operation cannot be performed, power generation is stopped (step 432).

  Even after the power generation is stopped in this way, the amount of stored power of the DC power storage device 2 is monitored, and the determination unit 103 determines whether or not the amount of stored power is below a predetermined amount of power (step 433). ). If it is determined that the amount of stored power has fallen below the predetermined amount of power, power generation is resumed (step 434). In this case, the DC power storage device 2 is charged with the power generation output set to a constant value equal to or higher than a predetermined power generation efficiency.

  The “minimum power generation efficiency” is an efficiency calculated in consideration of energy saving. The “predetermined amount of power” for determining the restart of power generation is an amount of power calculated from the total amount of power required for restarting the fuel cell and the amount of power consumed by the load.

(3-3) Effect As described above, according to the present embodiment, the output set value is lowered when the reduced state of the load 4 continues for a long time. When the power generation efficiency calculated from the consumption of raw fuel gas such as propane gas and the power consumption of the load is below the specified minimum power generation efficiency, it is possible to prevent the energy saving from being reduced by stopping the power generation. It becomes. In addition, when the amount of stored power of the DC power storage device 2 falls below a predetermined amount of power, high-efficiency power generation operation is possible by restarting power generation and generating power at a constant value that is equal to or greater than a predetermined power generation efficiency. It becomes.

1 is a block diagram showing a configuration of a first embodiment of a fuel cell power supply device according to the present invention. The block diagram which shows the structure of a control apparatus. The figure which shows the relationship between the electric power generation output in a fuel cell electric power generating apparatus, and electric power generation efficiency. The flowchart which shows the flow (first half part) of the process in the control apparatus of 1st Embodiment. The flowchart which shows the flow (second half part) of the process in the control apparatus of 1st Embodiment. The block diagram which shows the structure of 2nd Embodiment of the fuel cell power supply device which concerns on this invention. The flowchart which shows the flow (second half part) of the process in the control apparatus of 2nd Embodiment. The flowchart which shows the flow (second half part) of the process in the control apparatus of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fuel cell 2 ... DC power storage device 3 ... Power converter 4 ... Independent load 5 ... DC bus 6 ... DC-DC converter 7 ... Charge / discharge current measuring device 8 ... Charge / discharge power measuring device 9 ... Current measuring device 10 ... Voltage meter 11 ... Power meter 12 ... Auxiliary power supply device 13 ... Auxiliary device 100 ... Control device 101 ... Data acquisition unit 102 ... Calculation unit 103 ... Determining unit 104 ... Setting unit 105 ... Output unit 106 ... Storage unit

Claims (6)

A fuel cell that generates direct-current power by an electrochemical reaction between a fuel gas and an oxidant gas;
A DC-DC converter for adjusting the voltage of the DC power;
A DC power storage device for storing the DC power;
A power converter for converting the DC power to DC or AC power and supplying the load to the load;
An auxiliary power supply device for supplying electric power to the auxiliary equipment required for power generation of the fuel cell;
A DC bus connected to the DC-DC converter, the DC power storage device, the power conversion device and the auxiliary power supply device;
A control device for changing an output set value of DC power of the DC-DC converter according to power consumption of the load;
A charge / discharge current measuring instrument for measuring a charge / discharge current of the DC power storage device;
A voltage measuring instrument for measuring the voltage of the DC bus ,
The controller is
When the average power consumption of the load is within a predetermined range, if the total power consumption of the load and the auxiliary machine is smaller than the output power that allows the fuel cell to obtain a predetermined power generation efficiency, the output Increasing the set value to a value equal to or greater than the amount of output power at which the fuel cell can obtain a predetermined power generation efficiency, and setting that value as a new output set value ,
When the average power consumption of the load is lower than the lower limit value of the predetermined range, when at least one of the voltage of the DC bus or the charging current of the DC power storage device deviates from the upper limit value, the DC Lowering the output set value of the DC-DC converter so that both the voltage of the bus and the charging current of the DC power storage device are below the respective upper limit values,
A fuel cell power supply device. In the case where the average power consumption of the previous SL load exceeds the upper limit of the predetermined range,
When the voltage of the DC bus deviates from the lower limit value, or the discharge current of the DC power storage device deviates from the upper limit value,
The control device increases the output set value of the DC-DC converter so that the voltage of the DC bus is equal to or higher than the lower limit value and the discharge current of the DC power storage device is equal to or lower than the upper limit value. The fuel cell power supply device according to claim 1 . A fuel cell that generates direct-current power by an electrochemical reaction between a fuel gas and an oxidant gas;
A DC-DC converter for adjusting the voltage of the DC power;
A DC power storage device for storing the DC power;
A power converter for converting the DC power to DC or AC power and supplying the load to the load;
An auxiliary power supply device for supplying electric power to the auxiliary equipment required for power generation of the fuel cell;
A DC bus connected to the DC-DC converter, the DC power storage device, the power conversion device and the auxiliary power supply device;
A control device for changing an output set value of DC power of the DC-DC converter according to power consumption of the load;
A charge / discharge power measuring instrument for measuring charge / discharge power of the DC power storage device;
A voltage measuring instrument for measuring the voltage of the DC bus ,
The controller is
When the average power consumption of the load is within a predetermined range, if the total power consumption of the load and the auxiliary machine is smaller than the output power that allows the fuel cell to obtain a predetermined power generation efficiency, the output Increasing the set value to a value equal to or greater than the amount of output power at which the fuel cell can obtain a predetermined power generation efficiency, and setting that value as a new output set value ,
When the average power consumption of the load is less than or equal to the lower limit value of the predetermined range, and the integrated value of the charging power of the DC power storage device deviates from the upper limit value, the output set value is set to the charging power. Changing to a new output setting value obtained by subtracting the surplus power calculated from the integrated value;
A fuel cell power supply device. The average power consumption of the previous SL load, in the case of more than the upper limit of the predetermined range,
When the integrated value of the discharge power of the DC power storage device deviates from the upper limit value,
Wherein the control device, a fuel cell according to the output setting value, the 請 Motomeko 3 you and changes to the discharge power accumulated value new output set value obtained by adding the power shortage amount calculated from the Power supply. If the power generation efficiency of the fuel cell is below a predetermined minimum power generation efficiency, a fuel cell according to any one of claims 1 to 4, characterized in that it is configured to stop the power generation Power supply. 6. The fuel cell power supply device according to claim 5 , wherein power generation is resumed when the amount of stored power of the DC power storage device falls below a lower limit thereof. 7.

Images