JP2014171375A - Power supply system, power supply program and power supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance continuity of power generation upon power outage by preventing malfunction when using power generation output from power generation means for charging a storage battery, even when an FC system using a storage battery as a voltage source is included in the power generation means.SOLUTION: A power supply system (2) including power generation means (FC system 4) and power storage means (power storage system 6) includes charging means (linked charging circuit 8) for charging the power storage means with power generation output from the power generation means, upon power outage of a system power supply (10). The power generation means generates power by using the power supplied from the power storage means, and the charging means supplies the power generation output to the power storage means, after a certain standby time from detection of power outage of the system power supply.

Description

The present invention relates to a power supply system, a power supply program, and a power supply method including a power generation unit such as a fuel cell cogeneration system (hereinafter simply referred to as “FC system”) and a power storage unit.

  In the FC system, power generation is performed according to the amount of power load at a demand destination such as a home, and the power generation output is supplied to the power load. The amount of power load is measured by a current sensor installed at a demand destination. This FC system mainly uses a system power supply to supply generated power to an electric load. The system power supply is commercial power supplied from an electric power company.

  The first reason for using the system power supply is to prevent reverse power flow. In the FC system, power generation is performed with electric power that is lower by several tens of watts than the electric power load, and electric power of about several tens of watts is always provided by system power. The reason is that if the FC system generates electric power as low as several tens of watts in this way, the power generated by the FC system can be prevented from flowing back into the system even if the power load increases or decreases.

  The second is to secure a voltage source in the FC system. The FC system has a current type inverter. This current type inverter is effective for controlling the amount of generated current, but cannot generate power if the voltage source is lost. A voltage source is indispensable for an FC system using a current type inverter.

With respect to such an FC system, it is known that a power generation device is incorporated and power supply from the FC system to a load can be performed even when the system power supply is disconnected from the FC system, such as during a power failure (for example, patents). Reference 1).

JP 2012-044733 A

  By the way, when the system power supply is disconnected, the voltage source disappears from the FC system, and the FC system stops power generation. Therefore, if a storage battery is installed on the primary side of this FC system, this storage battery can be used as a voltage source, and the FC system can continue power generation even when the system power supply is disconnected. That is, it is possible to supply the power generated by the FC system to the power load at the time of a power failure of the system power supply.

  If the storage battery is charged by the power generation output of the FC system at the time of a power failure, the amount of electricity stored at the time of the power failure can be maintained, and the power supply to the power load can be extended. At that time, if the power generation of the FC system is confirmed at the time of a power failure and the storage battery is charged with the generated power output, the power loss can be suppressed. At this time, the power generation of the FC system may be determined based on whether the output power (for example, current) of the FC system is equal to or greater than a threshold value.

  By the way, when a power failure is detected, the presence or absence of power transmission of the FC system is confirmed. If it is determined that the FC system does not transmit power and the power generation is stopped even though power is generated depending on the situation, the storage battery may not be charged with the power generation output of the FC system. When the power storage system detects a power failure, the power storage system is switched to power feeding of the storage battery. This switching operation may disturb the frequency and voltage of the power supply. In such a case, the FC system becomes a single operation detection (passive, active), and there is a problem that the FC system stops sending the generated power even though it is generating power.

  The FC system sends power according to the power load, but if a power generator is connected to the electrical secondary side of the FC system, the power load is supplied from the power generator to the power load, and the load amount is reduced. Reduces the power output. As a result, the measured value of the current sensor that measures the power generation output of the FC system becomes small. In this case, there is a problem that the power supply from the FC system is reduced in spite of power generation, and the power supply output becomes 0 [W] in some cases.

  It takes time to start up the FC system. For this reason, once it is determined that the FC system is stopped, there is a problem that the storage battery is not charged with the power generation output of the FC system even if the FC system subsequently shifts to the power generation state.

  Therefore, in view of the above problems, the first object of the present invention is to prevent malfunction when the power generation output of the power generation means is used for charging a storage battery, and to improve the continuity of power generation during a power failure.

A second object is to improve the continuity of power generation during a power failure even when an FC system using a storage battery as a voltage source is included in the power generation means.

  In order to achieve the above object, a power feeding system according to the present invention is a power feeding system including a power generation unit and a power storage unit, and includes a charging unit that charges the power storage unit with a power generation output of the power generation unit when a power failure occurs in a system power supply. The power generation means generates power using the power supplied from the power storage means, and the charging means supplies the power generation output to the power storage means after a certain standby time from the detection of a power failure of the system power supply.

  Preferably, the power supply system further includes a power generation detection unit that detects a power generation output of the power generation unit, and a determination unit that determines presence or absence of the power generation output based on the detection output of the power generation detection unit. If the output is obtained, the charging means may charge the power storage means.

  In the power feeding system, preferably, the determination unit periodically determines whether or not the power generation output is present, and if the power generation output is obtained in the power generation unit, the power storage unit may be charged with the power generation output. .

  In order to achieve the above object, a power supply program according to the present invention is a power supply program that is executed by a computer mounted in a power supply system including a power generation unit and a power storage unit. Is generated, and the elapse of a certain standby time from the detection of the power failure of the system power supply is monitored. After the elapse of the standby time, the charging unit causes the computer to execute a process of supplying the power generation output to the power storage unit.

  In the above power supply program, preferably the presence / absence of the power generation output is periodically determined, and if the power generation means generates the power generation output, the computer is caused to execute a process of charging the power storage means with the power generation output. May be.

  In order to achieve the above object, a power feeding method of the present invention is a power feeding method used in a power feeding system including a power generation means and a power storage means, and causes the power generation means to generate a power generation output when a power failure occurs in a system power supply. , Monitoring the elapse of a certain standby time from detection of a power failure of the system power supply, and charging the power supply means to supply the power generation output to the power storage means after elapse of the standby time.

Preferably, the power supply method includes a step of periodically determining whether or not the power generation output is present, and a step of charging the power storage unit with the power generation output if the power generation unit generates the power generation output. But you can.

  According to the present invention, the following effects can be obtained.

  (1) During a power failure, it is determined whether the power generation means is generating power after a certain time from the power failure, and if the power generation means is generating power, the power storage means is charged with the generated power output, so malfunction can be prevented, Economic efficiency and efficiency can be improved.

  (2) Even if the power generation means includes an FC system that uses a storage battery as a voltage source, the power generation means charges the power storage means from the power generation means after confirming the power generation by the power generation means at the time of a power failure. It is possible to improve continuity.

  (3) Since the power storage means can be supplemented with the amount of power storage required to maintain the power generation by the power generation means, it is possible to continuously supply power to the load over a long period of time.

Other objects, features, and advantages of the present invention will become clearer with reference to the accompanying drawings and each embodiment.

It is a figure which shows the electric power feeding system which concerns on 1st Embodiment, and the operation | movement at the time of the power failure. It is a flowchart which shows the process sequence at the time of a power failure. It is a flowchart which shows the process sequence at the time of a power failure. It is a figure which shows the electric power feeding system which concerns on 2nd Embodiment. It is a figure which shows the structural example of a control part. It is a figure which shows a part of electric power feeding system which concerns on other embodiment. It is a figure which shows a part of electric power feeding system which concerns on other embodiment.

[First Embodiment]

<System configuration>

  FIG. 1A shows a power supply system according to the first embodiment. The configuration shown in FIG. 1A is an example, and the present invention is not limited to such a configuration.

  The power supply system 2 includes an FC system (fuel cell cogeneration system) 4, a power storage system 6, and an interconnection charging circuit 8.

  The FC system 4 is a stationary power generation device and is an example of a power generation means. The FC system 4 may be a solar power generation system or the like. In the FC system 4, when a power failure occurs in the system power supply 10, the power generation output is supplied to the power load 14 by the distribution system 12 and is also supplied to the power storage system 6 by the interconnection charging circuit 8. The power storage system 6 is an example of power storage means. The connected charging circuit 8 is an example of a charging unit.

  A system power supply 10 is connected to the power distribution system 12. When the grid power supply 10 is interconnected, grid power is supplied from the grid power supply 10 to the power load 14. At this time, the power storage system 6 is charged with the received power from the system power supply 10. This power storage system 6 includes a voltage sensor 15. This voltage sensor 15 is a means for monitoring the state of the system power supply 10 and is an example of a power failure detection means for detecting a power failure of the system power supply 10. The voltage sensor 15 is connected to the input end of the power distribution system 12 and detects an input voltage from the power system 10 from the power distribution system 12.

  A current sensor 16-1 is connected to the power distribution system 12. The current sensor 16-1 is, for example, a current transformer. The current sensor 16-1 is an example of a detection unit for obtaining control information necessary for power generation control of the FC system 4. The current output that is the sensor output of the current sensor 16-1 is used for power generation control of the FC system 4.

  A current sensor 16-2 is installed in the interconnection circuit 18 that connects the FC system 4 to the power distribution system 12. The current sensor 16-2 is also a current transformer, for example. The electric power generated by the FC system 4 is measured by the current sensor 16-2. That is, at the time of a power failure of the system power supply 10, the detection output of the current sensor 16-2 indicates the presence or absence of power generation of the FC system 4. The detection output of the current sensor 16-2 is applied to the power storage system 6.

  The power storage system 6 includes a storage battery 20 and an inverter (hereinafter referred to as “INV”) 22. The direct current output of the storage battery 20 is converted into an alternating current output by the INV 22. This AC output is output to the power distribution system 12 and applied to the FC system 4.

  During a power failure, power is supplied from the power storage system 6 and the FC system 4 generates power. The power generation output of the FC system 4 is applied to the storage battery 20 via the connection charging circuit 8. In this FC system 4, DC power is generated by a fuel cell, and this DC output is converted into an AC output. This AC output is applied to the interconnection charging circuit 8. This interconnection charging circuit 8 includes an AC-DC converter (A / D) 24. The A / D 24 converts the alternating current output of the FC system 4 into direct current. Thereby, the power generation output of the FC system 4 is supplied to the storage battery 20 at the time of a power failure of the system power supply 10.

<Operation at power failure>

  FIG. 1B shows the operation of the power feeding system 2 when the system power supply 10 is out of power.

  The power storage system 6 shifts from a series operation to a self-sustained operation when the voltage sensor 15 detects a power failure during a power failure of the system power supply 10. This independent operation is an operation state in which the FC system 4 and the power storage system 6 are made independent from the system power supply 10 when the system power supply 10 is disconnected. When the system power supply 10 is shifted to a self-sustained operation during a power failure, the output of the storage battery 20 is converted into an alternating current by the INV 22. This AC output is output to the power distribution system 12, and the FC system 4 generates power with the electric power. The power generation output of the FC system 4 is supplied to the power load 14 and is also supplied to the interconnection charging circuit 8. The power generation output of the FC system 4 is detected by the current sensor 16-2, and the charging operation of the storage battery 20 is started with this detection.

  When the system power supply 10 fails, power is supplied from the power storage system 6 and the FC system 4 generates power. In this case, since the FC system 4 is supplied with power from the power storage system 6, the power failure of the system power supply 10 is not detected by the FC system 4. That is, the FC system 4 operates without generating a power failure of the system power supply 10 and generates power by supplying power from the power storage system 6. The power generation output of the FC system 4 is supplied to the power load 14 and is also supplied to the interconnection charging circuit 8.

  The power generation output of the FC system 4 is detected by the current sensor 16-2. In response to this detection output, the power storage system 6 shifts to a discharging operation and starts a charging operation at the time of a power failure of the system power supply 10. That is, at the time of a power failure of the system power supply 10, the output of the storage battery 20 is converted into alternating current by the INV 22 and output to the power distribution system 12.

  At the time of power failure of the system power supply 10, the DC output obtained by the AC / DC conversion of the A / D 24 is supplied to the storage battery 20 of the storage system 6 by the interconnection charging circuit 8 by supplying the power generation output of the FC system 4. Thereby, the storage battery 20 of the electrical storage system 6 is continuously charged by the power generation output of the FC system 4. That is, at the time of a power failure of the system power supply 10, the power storage amount of the power storage system 6 used for the FC system 4 is compensated by the power generation output of the FC system 4. As a result, the FC system 4 can continuously generate power.

<Processing procedure of power supply system 2>

  FIG. 2 shows a processing procedure of time series operation at the time of power failure. This processing procedure is an example of the power supply program or power supply method of the present invention.

  In this processing procedure, the state of the system power supply 10 is monitored. A power failure occurs in the system power supply 10 (S11), and this power failure is detected by the voltage sensor 15 (S12). In response to this power failure detection, the power of the storage battery 20 is supplied from the power storage system 6 to the power load 14 and the FC system 4 (S13).

  The FC system 4 generates power using the power of the storage battery 20 (S14). In this case, if the power storage system 6 is stopped, power generation is started after the power storage system 6 is activated.

  The electric power generated by the FC system 4 charges the storage battery 20 of the power storage system 6 through the interconnection charging circuit 8 (S15).

  FIG. 3 shows a processing procedure of the power feeding method of the power feeding system 2. This processing procedure is an example of the power supply method or power supply program of the present invention. This power supply program is a program for causing the computer of the power supply system 2 to execute.

  This processing procedure includes processing for monitoring the passage of a certain standby time after detection of a power failure, processing for determining whether or not the FC system 4 is transmitting power, and processing for executing such processing while continuing the charging operation.

  In this processing procedure, the power failure of the system power supply 10 is detected by starting the processing (S21). This power failure detection is performed by the detection output of the voltage sensor 15 in the power distribution system 12.

  When a power failure of the system power supply 10 is detected, for example, T1 = 10 [seconds] is awaited as the first standby time T1 from the power failure detection (S22).

  After this waiting time T1, the power generation output P of the FC system 4 is determined (S23). In the determination of the power generation output P, it is determined whether or not the power generation output P is a predetermined value, for example, 50 [W] or more (S24).

  If the power generation output P of the FC system 4 is P ≧ 50 [W] (YES in S24), charging is started (S25). The power generation output of the FC system 4 is used for this charging, and the storage battery 20 is charged by the interconnection charging circuit 8.

  During this charging, power recovery is detected (S26). This power recovery detection is performed by the voltage sensor 15. When power recovery is detected, charging by the grid charging circuit 8 using the power generation output of the FC system 4 is stopped (S27), and this process is terminated.

  If the power generation output P of the FC system 4 is P <50 [W] in the determination of S24 (NO in S24), for example, the second waiting time T2 waits for elapse of 310 [seconds] (S28). The waiting time T2 is set to a time different from the waiting time T1. In this embodiment, T1 <T2 is set, but T1 = T2 and T1 ≠ T2 may be set.

  After this waiting time T2, the power generation output P of the FC system 4 is determined (S29). In the determination of the power generation output, it is determined whether or not the power generation output P is a predetermined value, for example, P ≧ 50 [W] (S30).

  If the power generation output P of the FC system 4 is P ≧ 50 [W] (YES in S30), the process proceeds to charging (S25). Similarly, the power generation output of the FC system 4 is used for this charging, and the storage battery 20 is charged by the interconnection charging circuit 8.

  If the power generation output P of the FC system 4 is P <50 [W] (NO in S30), charging is performed (S31). For this charging, if the FC system 4 is generating power, the generated output is used, and if the FC system 4 is not generating power, the power supplied from the power storage system 6 is used. The power generation output or the power supplied from the power storage system 6 is supplied to the interconnection charging circuit 8, and the storage battery 20 is charged.

  The power generation output P of the FC system 4 is determined (S32). In the determination of the power generation output P, it is determined whether or not the power generation output P is a predetermined value, for example, P ≧ 50 [W] (S33).

  If the power generation output P of the FC system 4 is P ≧ 50 [W] (YES in S33), the process proceeds to charging (S25). Thereby, the storage battery 20 is continuously charged with the power generation output of the FC system 4.

  If the power generation output P of the FC system 4 is P <50 [W] (NO in S33), charging is stopped (S34). After the elapse of 30 minutes (S25) as the third waiting time T3 from this charging stop, for example, the process proceeds to charging (S31), and the processes of S32, S33, S34 and S35 are continued. In this embodiment, T2 <T3 is set, but T2 = T3 and T2 ≠ T3 may be set. When the power generation output P of the FC system 4 reaches P ≧ 50 [W], the process proceeds to charging (S25).

  In this processing procedure, if the power generation output P of the FC system 4 is P <50 [W] in S24 (NO in S24), it is parallel to the processing in S28, S29, S30, S31, S32, S33, S34, and S35. Then, power recovery is detected (S36). When this power recovery is detected, the process proceeds to charge stop (S27), and this process is terminated.

<Features and effects of the first embodiment>

  (1) As described above, since standby is performed for a certain waiting time T1 after a power failure is detected, malfunction of the power feeding system 2 including the FC system 4 can be prevented.

  (2) Since the power generation output P is determined after the standby time T1 has elapsed since the detection of the power failure, the presence or absence of the power generation output P of the FC system 4 can be reliably determined. Thereby, operation reliability can be ensured. In other words, when the FC system 4 performs the independent operation detection (passive), the power generation is continued, but the output is not transmitted for about 5 seconds, for example. Therefore, after the standby time T1 of 5 [seconds] or more, preferably about 10 [seconds], the power generation output P of the FC system 4 is determined. Since the presence or absence of the power generation output P of the FC system 4 is determined when the power generation of the FC system 4 is resumed, the power generation confirmation of the FC system 4 can be appropriately performed.

  (3) When the FC system 4 detects the independent operation (active), the power generation is continued, but the power generation output P is obtained after the elapse of about 150 seconds to 300 seconds. Therefore, the presence or absence of the power generation output P of the FC system 4 is determined by interposing the standby time T2, and the standby time T2 is preferably 300 [seconds] or longer. When the FC system 4 resumes power generation, the presence or absence of the power generation output P of the FC system 4 is determined at that time, so that the power generation confirmation of the FC system 4 can be appropriately performed.

  (4) According to the above (2) and (3), it is possible to reliably determine whether or not the power generation output P is obtained in the FC system 4, and avoid misjudgment and malfunction.

  (5) In the above embodiment, the presence or absence of the power generation output P of the FC system 4 is determined while operating the grid charging circuit 8. That is, the detection output (current value) of the current sensor 16-1 increases due to the output of the power storage system 6 charged by the interconnection charging circuit 8, and the FC system 4 increases the generated power. Since the presence or absence of the power generation output P of the FC system 4 is confirmed when the transmission power of the FC system 4 increases, the power generation confirmation of the FC system 4 can be appropriately performed.

  (6) Since the presence or absence of the power generation output P of the FC system 4 is periodically checked even after the stop of the FC system 4 is determined, the storage battery 20 can be charged after the power generation of the FC system 4 is started.

  (7) As described above, the presence or absence of the power generation output P of the FC system 4 is appropriately determined, and the operation control is performed based on such determination. Therefore, a large amount of charging power can be supplied from the grid charging circuit 8 to the storage battery 20. . Therefore, at the time of a power failure, the amount of power stored in the storage battery 20 can be maintained, and power supply to the power load 14 can be continued for a longer time.

[Second Embodiment]

<System configuration>

  FIG. 4 shows a power feeding system according to the second embodiment. In FIG. 4, the same parts as those in FIG.

  The FC system 4 of this embodiment includes a power generation unit 26 and a control unit 28. The power generation unit 26 may be any power generation means such as a fuel cell or a solar panel. The power generation output of the FC system 4 is fed from the distribution system 12 to the power load 14. The control unit 28 is configured by a computer and controls a power generation operation such as when the power generation unit 26 generates power.

  A detection output of the current sensor 16-1 in the power distribution system 12 is added to the control unit 28 as a control input. Therefore, the control unit 28 receives the output of the current sensor 16-1 and controls the power generation amount of the power generation unit 26.

  The power storage system 6 includes a storage battery 20, an INV 22, and a control unit 30. The storage battery 20 is an example of a secondary battery that can be charged and discharged. The INV 22 converts the output of the storage battery 20 into an AC output and outputs it to the power distribution system 12. The control unit 30 is configured by a computer, and the output of the current sensor 16-2 in the interconnection circuit 18 is applied as a control input. At the time of a power failure of the system power supply 10, it is detected from the output of the FC system 4 that the FC system 4 is in a power generation state. During power generation by the FC system 4, the power storage system 6 starts charging the storage battery 20.

  The charging battery 8 is used for charging the storage battery 20. This interconnection charging circuit 8 includes an A / D 24, a charging path 32, a switch circuit 34 and a control unit 36. The charging path 32 supplies the output of the FC system 4 to the A / D 24 and supplies the converted output of the A / D 24 to the storage battery 20 of the power storage system 6.

  The switch circuit 34 is controlled by the output of the control unit 36. By this control, the switch circuit 34 opens and closes the charging path 32 and makes the charging path 32 conductive when the FC system 4 generates power.

  The control unit 36 receives the detection output of the current sensor 16-2 and generates a control output for opening and closing the switch circuit 34. When the FC system 4 generates power, the controller 36 can obtain an output representing the power generation.

  The processing procedure by the control unit 36 includes processing for monitoring the passage of a certain standby time after detection of a power failure of the system power supply 10, processing for determining whether or not the FC system 4 is transmitting power, and executing such processing along with the continuation of the charging operation. Processing is included.

  According to such a configuration, the control unit 36 receives the output of the current sensor 16-2 and makes the switch circuit 34 conductive. When the switch circuit 34 is turned on and when the system power supply 10 is interrupted, the power generation output of the FC system 4 is added to the A / D 24 and converted into a DC output. This DC output is supplied to the storage battery 20 of the power storage system 6 and the storage battery 20 is charged. Thereby, at the time of a power failure of the system power supply 10, the power storage amount of the storage battery 20 of the power storage system 6 used for power generation of the FC system 4 is compensated by the power generation output of the FC system 4.

  In this embodiment, the processing of the control unit 36 causes the standby time T2 to further intervene after waiting for a certain standby time T1 after detection of a power failure, and after the elapse of this standby time T2, the power generation output of the FC system 4 The presence or absence of P is judged. This makes it possible to reliably determine whether or not the power generation output P is obtained in the FC system 4, and to avoid erroneous determination of the power generation output P and malfunctions caused thereby.

  Further, the presence or absence of the power generation output P of the FC system 4 is determined while maintaining the charging operation of the storage battery 20 by the interconnection charging circuit 8. Therefore, the detection output (current value) of the current sensor 16-1 increases due to the output of the power storage system 6 charged by the interconnection charging circuit 8, and the FC system 4 increases the generated power. Since the presence or absence of the power generation output P of the FC system 4 is confirmed when the transmission power of the FC system 4 increases, the power generation confirmation of the FC system 4 is appropriately performed.

  Even after it is determined that the FC system 4 is stopped, the presence or absence of the power generation output P of the FC system 4 is periodically checked, whereby the storage battery 20 can be charged after the power generation of the FC system 4 is started. Since the presence or absence of the power generation output P of the FC system 4 is appropriately determined, malfunction due to erroneous determination can be avoided.

  In this embodiment, the detection output is applied to the control units 30 and 36 by the output of the single current sensor 16-2, and at the time of power failure, that is, the discharge operation by the power generation of the FC system 4 and the FC system 4 The charging operation of the storage battery 20 by the power generation output is performed simultaneously. That is, since the operations of the power storage system 6 and the linked charging circuit 8 are synchronized, it is possible to prevent a reduction in the amount of power stored in the storage battery 20.

  FIG. 5 shows an example of hardware of the control unit 36 that executes the control and processing described above. The control unit 36 is configured by a microcomputer. The control unit 36 includes a processor 38, a memory 40, a RAM (Random-Access Memory) 42, and an input / output unit 44, which are interconnected by a bus 46.

  The processor 38 executes various programs such as an OS (Operating System) stored in the memory 40. In the processing of the processor 38, the detection output of the current sensor 16-2 is received by the input / output unit 44, the switch circuit 34 is turned on when the FC system 4 is generating power, and the switch circuit 34 is cut off when the operation of the FC system 4 is stopped. Control such as generating control output is included.

  The memory 40 stores a program such as the OS described above. The RAM 42 constitutes a work area for information processing. The input / output unit 44 is used to input the detection output of the current sensor 16-2 and take out the control output.

<Effects of Second Embodiment>

  (1) When the FC system 4 is generating the power generation output, it is possible to avoid erroneous determination such as stoppage of the FC system 4. That is, if a predetermined power generation output is obtained in the FC system 4, the storage battery 20 of the power storage system 6 can be reliably charged at the time of a power failure, and the duration of power supply from the power supply system 2 to the power load 14 is extended. it can.

  (2) Even if it takes time to start up the FC system 4, if the FC system 4 shifts to the power generation state, the storage battery 20 of the power storage system 6 can be charged.

  (3) Thereby, a large amount of charging power can be supplied from the FC system 4 to the storage battery 20 via the interconnection charging circuit 8. Therefore, at the time of a power failure, the storage amount of the storage battery 20 can be maintained, and power supply to the power load 14 can be continued for a longer time.

[Other Embodiments]

  a) As shown in FIG. 6, a display unit 48 may be provided. By giving a display output from the control unit 36 to the display unit 48, a power outage state or a power supply state, an operation state of the FC system 4, a standby operation by the standby times T1, T2, and T3, and a storage amount of the storage battery 20 are displayed. May be.

  b) As shown to A of FIG. 7, A / D24 may be installed in the electrical storage system 6 side.

  c) As shown in B of FIG. 7, the control of the switch circuit 34 may be opened and closed by the control output of the control unit 30 on the power storage system 6 side. In this case, as shown in FIG. 5, the control unit 30 may have a configuration for executing the same processing as the control unit 36.

  d) As shown in C of FIG. 7, the A / D 24 and the switch circuit 34 may be installed on the power storage system 6 side.

  e) As shown in FIG. 7D, the A / D 24 may be provided on the power storage system 6 side in the system shown in FIG. 7B.

  f) As shown in E of FIG. 7, the switch circuit 34 may be provided on the power storage system 6 side in the system shown in D of FIG. 7.

As described above, the most preferable embodiment of the present invention has been described. The present invention is not limited to the above description. Various modifications and changes can be made by those skilled in the art based on the gist of the invention described in the claims or disclosed in the embodiments for carrying out the invention. It goes without saying that such modifications and changes are included in the scope of the present invention.

The present invention uses a power generation unit such as an existing FC system, or a power storage unit such as a storage battery system, and reliably checks the operation of the power generation unit and charges the storage battery with the power generation output, thereby improving the operation reliability. In the event of a power failure, power can be supplied for a long time.

DESCRIPTION OF SYMBOLS 2 Electric power feeding system 4 FC system 6 Power storage system 8 Connection charge circuit 10 System power supply 12 Distribution system 14 Power load 15 Voltage sensor 16-1, 16-2 Current sensor 18 Connection circuit 20 Storage battery 22 Inverter 24 AC-DC converter 26 Power generation Unit 28 Control unit 30 Control unit 32 Charging path 34 Switch circuit 36 Control unit 38 Processor 40 Memory 42 RAM
44 Input / output unit 46 Bus 48 Display unit

Claims (7)

A power supply system comprising a power generation means and a power storage means,
At the time of a power failure of the system power supply, comprising a charging means for charging the power storage means by the power generation output of the power generation means,
The power generation means generates power using the power supplied from the power storage means,
The power supply system, wherein the charging means supplies the power generation output to the power storage means after a predetermined waiting time from detection of a power failure of the system power supply. Furthermore, power generation detection means for detecting the power generation output of the power generation means,
Determination means for determining the presence or absence of the power generation output based on the detection output of the power generation detection means;
The power supply system according to claim 1, wherein if the power generation output is obtained by the power generation unit, the charging unit charges the power storage unit.   The said determination means judges the presence or absence of the said power generation output regularly, and if the power generation output is obtained by the said power generation means, the said electrical storage means will be charged by this power generation output. Power supply system. A power supply program to be executed by a computer mounted on a power supply system including a power generation means and a power storage means,
At the time of a power failure of the system power supply, the power generation means generates a power generation output,
Monitor the passage of a certain waiting time from the power failure detection of the system power supply,
After the standby time has elapsed, the power generation output is supplied to the power storage means.
A power supply program for causing the computer to execute processing. Periodically determine the presence or absence of the power generation output,
The power supply program according to claim 4, wherein if the power generation means generates a power generation output, the computer executes a process of charging the power storage means with the power generation output. A power supply method used in a power supply system including a power generation means and a power storage means,
Generating a power generation output in the power generation means at the time of a power failure of the system power supply;
Monitoring the passage of a certain standby time from the power failure detection of the system power supply;
A charging means for supplying the power generation output to the power storage means after elapse of the standby time;
A power supply method comprising: Periodically determining the presence or absence of the power generation output;
If the power generation means is generating a power generation output, charging the power storage means with the power generation output; and
The power feeding method according to claim 6, further comprising:

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