The fuel cell system includes: a power generation unit; an obtaining unit obtaining battery information indicating a storage state of a storage battery; and a control unit selecting one of a first control mode and a second control mode based on the battery information when load power changes from a
The fuel cell system includes: a power generation unit; an obtaining unit obtaining battery information indicating a storage state of a storage battery; and a control unit selecting one of a first control mode and a second control mode based on the battery information when load power changes from a first load power to a second load power, the first control mode being for supplying power from the power generation unit to the load by causing the power generation unit to generate power without causing the storage battery to charge and/or discharge, the second control mode being for causing the power generation unit to generate power with a change rate of generation power being set to a value smaller than a value in the first control mode, by causing the storage battery to charge and/or discharge.
대표청구항▼
1. A fuel cell system which is connected to a storage battery and supplies power to a load, the fuel cell system comprising: a power generation unit configured to generate power;an obtaining unit configured to obtain battery information indicating a storage state of the storage battery; anda control
1. A fuel cell system which is connected to a storage battery and supplies power to a load, the fuel cell system comprising: a power generation unit configured to generate power;an obtaining unit configured to obtain battery information indicating a storage state of the storage battery; anda control unit configured to select one of a first control mode and a second control mode based on the battery information when load power that is demand power of the load changes from a first load power to a second load power, the first control mode being for supplying power from the power generation unit to the load by causing the power generation unit to generate power without causing the storage battery to charge and discharge, the second control mode being a mode in which the control unit (i) determines a change rate of generation power having a value smaller than a value of a change rate of generation power in the first control mode, by causing the storage battery to supply power to the load or causing the storage battery to charge or discharge in such a manner that the storage battery is charged with at least part of power supplied from the power generation unit, and (ii) causes the power generation unit to generate power with the determined change rate of generation power in the second control mode, the change rate of generation power in the second control mode being a temporal change in the generation power of the power generation unit. 2. The fuel cell system according to claim 1, wherein the battery information includes a dischargeable power amount of the storage battery, andthe control unit is configured to, when the load power increases from the first load power to the second load power that is larger than the first load power, select the first control mode when the dischargeable power amount is smaller than a predetermined threshold, and select the second control mode in which the change rate of generation power in the second control mode is set to the value smaller than the value of the change rate of generation power in the first control mode by causing the storage battery to supply power to the load, when the dischargeable power amount is equal to or larger than the predetermined threshold. 3. The fuel cell system according to claim 2, further connected to a power system,wherein the control unit is configured to cause the storage battery and the power system to supply power to the load when the second control mode is selected. 4. The fuel cell system according to claim 3, wherein the control unit is configured to, with reference to the dischargeable power amount of the storage battery obtained by the obtaining unit as the battery information, cause the storage battery to supply power to the load when a shortage of power which is an amount of shortfall of the generation power below the second load power is equal to or smaller than the dischargeable power amount, and cause the power system and the storage battery to supply power to the load when the shortage of power is larger than the dischargeable power amount. 5. The fuel cell system according to claim 2, wherein when the generation power of the power generation unit is smaller than the second load power after the second control mode is selected,the obtaining unit is configured to obtain the dischargeable power amount of the storage battery at regular time intervals, andthe control unit is configured to select the first control mode when the dischargeable power amount obtained at regular time intervals falls below the predetermined threshold. 6. The fuel cell system according to claim 1, wherein the battery information includes a chargeable power amount of the storage battery, andthe control unit is configured to, when the load power decreases from the first load power to the second load power that is smaller than the first load power, select the first control mode when the chargeable power amount is smaller than a predetermined threshold, and select the second control mode in which the change rate of generation power in the second control mode is set to the value smaller than the value of the change rate of generation power in the first control mode by causing the storage battery to be charged with at least part of power supplied from the power generation unit, when the chargeable power amount is equal to or larger than the predetermined threshold. 7. The fuel cell system according to claim 6, further comprising a dummy load which consumes power,wherein the control unit is configured to supply surplus power to the dummy load and the storage battery when the second control mode is selected, the surplus power being power exceeding the second load power among the generation power. 8. The fuel cell system according to claim 7, wherein the control unit is configured to supply the storage battery with the surplus power which is the power exceeding the second load power among the generation power, after supplying the dummy load with the surplus power, and when supplying the storage battery with the surplus power, supply the storage battery with power, among the surplus power, of an amount equal to or smaller than the chargeable power amount, with reference to the chargeable power amount of the storage battery obtained by the obtaining unit as the battery information. 9. The fuel cell system according to claim 6, wherein when the generation power of the power generation unit is larger than the second load power after the second control mode is selected,the obtaining unit is configured to obtain the chargeable power amount of the storage battery at regular time intervals, andthe control unit is configured to select the first control mode when the chargeable power amount obtained at regular time intervals falls below the predetermined threshold. 10. The fuel cell system according to claim 1, wherein when the control unit selects the second control mode, the change rate of generation power in the second control mode determined by causing the storage battery to charge or discharge is smaller than a maximum change rate of power which has a predetermined impact on a product life of the fuel battery system. 11. The fuel cell system according to claim 1, wherein the battery information includes a state of charge of the storage battery, andwhen the control unit selects the second control mode, the control unit is configured to cause the storage battery to charge or discharge to prevent the state of charge included in the battery information from falling below a power amount necessary for activating the power generation unit. 12. The fuel cell system according to claim 1, further comprising a connection unit configured to detachably connect the storage battery with the fuel cell system. 13. A method of controlling a fuel cell system which is connected to a storage battery and supplies power to a load, the method comprising: generating power;obtaining battery information indicating a storage state of the storage battery; andselecting one of a first control mode and a second control mode based on the battery information when load power that is demand power of the load changes from a first load power to a second load power, the first control mode being for supplying power from a power generation unit to the load by causing the power generation unit to generate power without causing the storage battery to charge and discharge, the second control mode being a mode including (i) determining a change rate of generation power having a value smaller than a value of a change rate of generation power in the first control mode, by causing the storage battery to supply power to the load or causing the storage battery to charge or discharge in such a manner that the storage battery is charged with at least part of power supplied from the power generation unit, and (ii) causing the power generation unit to generate power with the change rate of generation power in the second control mode determined in the determining, the change rate of generation power in the second control mode being a temporal change in the generation power of the power generation unit. 14. A fuel cell system, comprising: a storage battery;a connection unit connected with the fuel cell system according to claim 1; and a power adjusting unit configured to perform adjustment for discharging the storage battery or charging the storage battery under a control of the control unit included in the fuel cell system.
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이 특허에 인용된 특허 (2)
Stolte, Ralf-Henning; Gründel, Harald, Energy supply system for supplying energy to aircraft systems.
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