JP2006311676A - Power supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively use power generated by conducting load-following control by separating only an accumulation means necessary for maintenance even at the maintenance for the accumulation means, in a power supply system comprising the accumulation means that is temporarily charged with surplus power generated by a generation means. <P>SOLUTION: This power supply system is constituted by comprising at least the two or more accumulation means 2A and 2B as continuous operation means that are temporarily charged with power generated from a photovoltaic power generation means 1 as a power generation means, and an individual blocking means 3 that individually blocks an accumulation battery 2Aa or 2Ba at the maintenance of the accumulation means 2A or 2B. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power supply system using a secondary battery in combination with power generation means such as a solar battery, wind power generation, and a fuel cell.

  In recent years, fossil fuel depletion and global warming have occurred due to an increase in the load on ordinary households. Use of clean energy and energy-saving devices such as solar power generation systems, power-saving devices, and system voltage stabilization devices have been developed. It has been demanded.

  Conventionally, this type of power supply system is known to control the output of the fuel cell and the charge / discharge power of the power storage means according to the power consumption of the load by combining the fuel cell and the secondary battery (for example, Patent Documents). 1).

  Hereinafter, the fuel cell system will be described with reference to FIG.

  As shown in the figure, the fuel cell 12 and the current control means 13 for controlling the output current of the fuel cell 12 to an arbitrary predetermined value, the power storage means 14 comprising a secondary battery, and the charge / discharge current of the power storage means 14 are controlled. The charge / discharge control means 15, the system current measuring means 18 for measuring the system current flowing through the main breaker 17 of the commercial power supply 16, the AC voltage measuring means 19 for measuring the voltage of the commercial power supply 16, and the output voltage of the fuel cell 12 Fuel cell voltage measuring means 20 for measuring, storage voltage measuring means 21 for measuring the voltage of the storage means 14, and power conversion for outputting the output of the fuel cell 12 and the discharge output of the storage means 14 to the commercial power supply 16 in a grid connection The means 22 is provided. With this configuration, the output of the fuel cell 12 and the charge / discharge power of the power storage means 14 are controlled according to the power consumption of the load 23.

  In addition, there is known one that can prevent damage and melting of the combustor by controlling the amount of surplus hydrogen gas sent to the combustor of the fuel cell to an appropriate value by combining with the secondary battery (for example, Patent Documents). 2).

  Hereinafter, the fuel cell system will be described with reference to FIG.

  As shown in the figure, the fuel cell system includes a secondary battery 25 that supplies power to an external load 24 and a fuel cell 26 that supplies power to at least the secondary battery 25. A power storage margin detecting means 27 for detecting the amount, a surplus power calculating means 28 for calculating a surplus power amount that can be generated by surplus fuel gas when the operation of the fuel cell 26 is stopped, and a power storage margin of the secondary battery 25. The power control unit 29 is configured to control the secondary battery 25 and / or the fuel cell 26 so that the amount is equal to or greater than the surplus power amount.

  Furthermore, when combined with a secondary battery, long-term power supply to the load is possible without causing an increase in capacity of the storage battery and without causing problems such as noise, vibration, and harmful gases. A backup power supply system is known (see, for example, Patent Document 3).

  Hereinafter, the backup power supply system will be described with reference to FIG.

  As shown in the figure, when the fuel cell 30 is provided and the discharge capacity of the storage battery 31 is greater than or equal to a predetermined value, the uninterruptible power supply 32 is energized to the load 33, and the discharge capacity of the storage battery 31 is reduced below the predetermined value. In this case, the fuel cell 30 is activated and the current from the fuel cell 30 to the load 33 is supplied to cut off the power supply from the uninterruptible power supply 32 to the load 33.

  Moreover, a power supply system using a secondary battery that temporarily charges surplus power of a fuel cell is known (see, for example, Patent Document 4).

  Hereinafter, this power supply system will be described with reference to FIG.

  As shown in the figure, the secondary batteries 34a to 34c are charged with surplus power from the fuel cells 35a to 35c, and supply insufficient power to the loads 36a to 36c when the generated power of the fuel cells 35a to 35c is insufficient. . For example, the control unit 37 is configured to control the power generation amount of the fuel cells 35a to 35c based on the power generation efficiency stored in the efficiency storage unit 38 so that the power generation efficiency of the fuel cells 35a to 35c is maximized. . Further, when the power generation amount of the fuel cells 35a to 35c when the power generation efficiency is maximized is smaller than the power supplied to the loads 36a to 36c, the secondary batteries 34a to 34c supply insufficient power to the loads 36a to 36c. Further, when the power generation amount of the fuel cells 35a to 35c when the power generation efficiency is maximized is larger than the power supplied to the loads 36a to 36c, surplus power is charged to the secondary batteries 34a to 34c. By the above operation, the fuel cells 35a to 35c can be efficiently generated. Further, when the power to be supplied to the loads 36a to 36c is smaller than the predetermined power and the charged amount of the secondary batteries 34a to 34c is larger than the predetermined charged amount, the control unit 37 is configured to use the fuel cells 35a to 35c. Is stopped, and power is supplied to the loads 36a to 36c by the secondary batteries 34a to 34c. By the above operation, the fuel cells 35a to 35c can be more efficiently generated.

  Furthermore, in the operation of a storage battery, there is known a power supply control device that shortens the charging time and capacity of the power storage means when a plurality of batteries are connected, and performs charge or discharge control so that no abnormality occurs in the power storage means. (For example, refer to Patent Document 5).

  Hereinafter, the power supply control device will be described with reference to FIG.

As shown in the figure, current measuring means 40a, 40b are connected in series to the power storage means 39a, 39b, respectively, and the power storage means 39a, current measuring means 40a, the power storage means 39b, and the measuring means 40b are connected in parallel. . The power storage means 39a and 39b, the current measurement means 40a and 40b, and the voltage measurement means 41 are connected in parallel. The charge / discharge control means 42 is also connected in parallel with the power storage means 39a, 39b and the current measurement means 40a, 40b. The measured current voltage values of the voltage measuring unit 41 and the current measuring units 40a and 40b are input to the state detecting unit 43, and the resistance value and the voltage value are calculated and input to the charge / discharge control unit 42. The charge / discharge control means 42 is configured to calculate a safe and short-time charge current value and a high-efficiency discharge current to control the charge / discharge currents of the power storage means 39a and 39b.
JP 2004-362787 A JP 2001-243961 A JP 2000-333386 A JP 2004-327448 A Japanese Patent Laid-Open No. 2004-215559

  In such a conventional power supply system, load follow-up control cannot be performed at the time of maintenance of the power storage means. For example, the fuel cell system in Patent Document 1 is configured to charge or discharge the power storage means according to the load power. However, at the time of maintenance of the power storage means, there is a problem that load following cannot be realized because there is no means for accumulating or consuming surplus power.

  Further, in the fuel cell system of Patent Document 2, the secondary battery is controlled so that a power storage margin that can correspond to the amount of surplus power that can be generated by surplus fuel gas is left in the secondary battery. There is a problem that load tracking cannot be realized without means for storing or consuming electric power.

  Furthermore, the backup power supply system of Patent Document 3 is a system having a storage battery for uninterruptible power supply, and does not have means for supplying power by storage or discharge during maintenance of the storage battery, and supplies power to the load. There is a problem that cannot be performed.

  The power supply system disclosed in Patent Document 4 includes a secondary battery so as to maximize the power generation efficiency of the fuel cell. However, there is no means for storing or consuming power during maintenance of the secondary battery, and the load fluctuation However, there is a problem in that it is necessary to stop the entire system from the output time constant of the fuel cell.

  Furthermore, the power supply control device of Patent Document 5 relates to optimum charge / discharge control for the power storage means, does not correspond to the maintenance of the power storage means, and is not a means for continuous operation.

  The present invention solves such a conventional problem. Even during the maintenance of the power storage means, the power storage means is not shut off, and only the power storage means requiring maintenance is disconnected, and maintenance is not required. The load following control can be performed by the power storage means, and the generated power can be effectively utilized by enabling continuous operation.

  The power supply system of the present invention can continuously operate the system even when the power storage means is partially stopped or partially disconnected by maintenance in a system in which the power of the power generation means is temporarily charged by the power storage means. The continuous operation means is configured as described above.

  By this means, it is possible to obtain a power supply system capable of continuous operation without stopping the system even when the power storage means is stopped.

  Moreover, it is set as the structure provided with the at least 2 or more electrical storage means which charges the electric power generated from an electric power generation means temporarily, and the separate interruption | blocking means which interrupts | blocks a storage battery separately.

  By this means, it is possible to obtain a power supply system capable of performing load follow-up control other than the storage battery performing maintenance even during maintenance of the power storage means.

  Furthermore, a maintenance diagnosis means for diagnosing the necessity of maintenance of the power storage means is provided.

  By this means, it is possible to obtain a power supply system capable of improving the performance of the load following control by diagnosing the maintenance of the power storage means in advance.

  Moreover, it is set as the structure provided with the specific means which pinpoints the electrical storage means in need of maintenance.

  By this means, it is possible to obtain a power supply system that can prevent the power storage means from being shut off and can follow the load and at the same time improve the operating rate of the system.

  Furthermore, it is set as the structure provided with the alerting | reporting means which alert | reports the electrical storage means in need of a maintenance.

  By this means, it is possible to allow the user to specify the power storage means that requires maintenance, and to obtain a power supply system that can easily perform maintenance.

  Moreover, it is set as the structure provided with the temporary stop means to stop at the time of a maintenance.

  By this means, it is possible to obtain a power supply system that can perform maintenance safely, including when all the power storage means are maintained.

  Furthermore, it is configured such that surplus power of the power generation means is temporarily charged by power storage means that does not require maintenance during maintenance.

  By this means, an unnecessary system suspension due to partial maintenance can be avoided, and a power supply system capable of improving the operating rate of the system can be obtained.

  The power storage means are connected in parallel.

  By this means, it is possible to obtain a power supply system that can make the circuit configuration for charging / discharging the power storage means simple and can be easily added.

  Furthermore, it is configured to include current limit value changing means for detecting the number of shut-off power storage means and changing the current limit value for charge / discharge control.

  By this means, it is possible to obtain a power supply system capable of avoiding excessive charging / discharging of power storage means that are not subject to maintenance during maintenance.

  The power storage means are connected in series.

  By this means, the step-up / step-down ratio of the charge / discharge circuit of the power storage means can be reduced, or the number of connected storage batteries can be reduced, and a power supply system that can be reduced in size can be obtained.

  Furthermore, it is set as the structure provided with the bypass means which bypasses the storage battery isolate | separated separately.

  By this means, even when the storage batteries are connected in series, a power supply system can be obtained that can be operated even by maintenance by bypassing.

  Further, the configuration includes voltage setting value changing means for detecting the number of bypassed power storage means and changing the set value of the storage battery voltage during charge control.

  This means provides a power supply system that can avoid using the storage battery in an overvoltage state, that is, overcharging, even during maintenance of the storage battery.

  Furthermore, before the maintenance notification, the apparatus is configured to include a discharge depth adjusting unit that sets the depth of discharge other than the target power storage unit to 50% to 80%.

  By this means, it is possible to increase the charging current limit value of the power storage means that is not subject to maintenance, and to obtain a power supply system that can avoid the output suppression of the power generation means.

  According to the present invention, in a system in which the power of the power generation means is temporarily charged by the power storage means, the system can be continuously operated even when the power storage means is partially stopped or partially disconnected by maintenance. With the configuration having the continuous operation means, it is possible to provide a power supply system capable of continuous operation without stopping the system even when the power storage means is stopped.

  Moreover, even when the power storage means is being maintained, the power storage means includes at least two or more power storage means for temporarily charging the generated power from the power generation means and the individual shut-off means for individually shutting off the storage battery. It is possible to provide a power supply system capable of performing load following control other than a storage battery that performs maintenance.

  Furthermore, a power supply system that can improve the performance of the load following control by diagnosing the maintenance of the power storage means in advance by providing a maintenance diagnosis means for diagnosing the necessity of maintenance of the power storage means is provided. it can.

  In addition, by including a specifying means for specifying the power storage means that requires maintenance, it is possible to prevent all the power storage means from being shut off and to follow the load, and at the same time improve the operating rate of the system. A power supply system can be provided.

  Furthermore, a power supply system is provided that can include a notification means for notifying a power storage means that requires maintenance so that a user can identify a power storage means that requires maintenance and can easily perform maintenance. it can.

  Further, by providing the temporary stop means for stopping during maintenance, it is possible to provide a power supply system that can perform maintenance safely, including when all power storage means are maintained.

  Furthermore, it is possible to avoid unnecessary system suspension due to partial maintenance by temporarily charging the surplus power of the power generation means with the power storage means that does not require maintenance at the time of maintenance. A power supply system capable of improving the rate can be provided.

  In addition, since the power storage units are configured to be connected in parallel, a circuit configuration for charging and discharging the power storage units can be simplified, and a power supply system that can be easily added is provided. Can be provided.

  Furthermore, by detecting the number of shut-off power storage means and including a current limit value changing means for changing the current limit value for charge / discharge control, avoid excessive charge / discharge of power storage means not subject to maintenance during maintenance. A power supply system can be provided.

  Further, the power storage system can be reduced in size by reducing the step-up / step-down ratio of the charge / discharge circuit of the power storage means, or by reducing the number of connected storage batteries, by connecting the power storage means in series. Can be provided.

  Furthermore, a power supply system that can operate even during maintenance by bypassing the storage battery even when the storage battery is connected in series by having a configuration that includes bypass means for bypassing the individually disconnected storage battery. Can be provided.

  In addition, it is possible to detect the number of bypassed storage means and to include a voltage set value changing means for changing the set value of the storage battery voltage at the time of charge control, so that the storage battery can be overvoltaged even during maintenance of the storage battery. It is possible to provide a power supply system that can avoid use in a state, that is, overcharge.

  Furthermore, before the maintenance notification, the configuration includes a discharge depth adjusting unit that sets the depth of discharge other than the target power storage unit to 50% to 80%, thereby increasing the charging current limit value of the power storage unit that is not the maintenance target. Therefore, it is possible to provide a power supply system that can avoid the output suppression of the power generation means.

  According to the first aspect of the present invention, in the system in which the power of the power generation means is temporarily charged by the power storage means, even when the power storage means is partially stopped or partially disconnected by maintenance, It has a structure having continuous operation means that enables continuous operation, and has an effect that continuous operation is possible without stopping the system even when the power storage means is stopped. .

  In addition, it is configured to include at least two or more power storage means for temporarily charging the generated power from the power generation means, and individual shut-off means for individually shutting off the storage battery, such as during maintenance of the power storage means. Also, the load follow-up control can be performed by a battery other than the storage battery that performs maintenance.

  Furthermore, it is configured to include a maintenance diagnosis unit for diagnosing the necessity of maintenance of the power storage unit, and the performance of load follow-up control can be improved by diagnosing the maintenance of the power storage unit in advance. Have.

  In addition, it is configured to include a specific unit that identifies a power storage unit that requires maintenance, and can prevent all power storage units from being shut off, and can perform load following and at the same time improve the operating rate of the system. Has the effect of being able to.

  Furthermore, it is configured to have a notification means for notifying the power storage means that requires maintenance, allowing the user to specify the power storage means that requires maintenance, and performing the maintenance easily. Have.

  In addition, it is configured to include a temporary stopping means for stopping at the time of maintenance, and has an effect that maintenance can be performed safely including when all power storage means are maintained.

  Furthermore, it is configured to temporarily charge the surplus power of the power generation means by the power storage means that does not require maintenance during maintenance, so that unnecessary system suspension due to partial maintenance can be avoided. It has the effect | action that an operation rate can be improved.

  Further, the power storage means are configured to be connected in parallel, and the circuit configuration for charging / discharging the power storage means can be simplified, and the expansion can be easily realized. Have

  Furthermore, it is configured to include a current limit value changing means for detecting the number of shut-off power storage means and changing the current limit value for charge / discharge control. It has the effect that it can be avoided.

  In addition, the power storage means is configured to be connected in series, and the voltage step-up / down ratio of the charge / discharge circuit of the power storage means can be reduced, or the number of connected storage batteries can be reduced, enabling downsizing. It has the effect of being able to.

  Furthermore, it is configured to include a bypass means for bypassing the individually separated storage battery, and even when the storage battery is connected in series, it can be operated even during maintenance by bypassing. Have

  In addition, it is configured to include voltage setting value changing means for detecting the number of bypassed power storage means and changing the set value of the storage battery voltage at the time of charge control. In other words, there is an effect that it is possible to avoid using the battery in an overcharge state.

  Furthermore, before the maintenance notification, the apparatus has a depth-of-discharge adjusting means that sets the discharge depth other than the target power storage means to 50% to 80%, and increases the charging current limit value of the power storage means that is not the maintenance target. It is possible to avoid the suppression of the output of the power generation means.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a power supply system according to Embodiment 1 of the present invention. As shown in the figure, the power supply system according to Embodiment 1 includes a photovoltaic power generation means 1 and two power storage means 2A connected in parallel as continuous operation means for temporarily charging generated power from the photovoltaic power generation means 1. 2B and an individual shut-off means 3 for individually shutting off the storage batteries 2Aa and 2Ba during maintenance, and a maintenance diagnosis means 4 for diagnosing the necessity of maintenance of the power storage means 2A and 2B. The solar power generation means 1 includes a solar cell 1a, a step-up chopper circuit 1b that appropriately converts the generated power from the solar cell 1a into an optimum voltage, and an inverter circuit 1c that converts DC power into AC power. Yes.

  Next, the individual blocking means 3 will be described with reference to the flowchart of FIG. As shown in the figure, the individual shut-off means 3 stops charging / discharging the storage battery 2Aa or 2Ba during maintenance of the storage battery 2Aa or 2Ba. When the charge / discharge current of the storage battery 2Aa or 2Ba to be maintained becomes zero, the wiring to the storage battery 2Aa or 2Ba is cut off.

  Next, the maintenance diagnosis unit 4 will be described with reference to the flowchart of FIG. As shown in the figure, the maintenance diagnosis unit 4 calculates the sum of the charge current integrated value and the discharge current integrated value of the power storage units 2A and 2B. The deviation of the calculated integrated value is calculated, and when the deviation exceeds the threshold value K, it is determined that maintenance is necessary, and when it is equal to or less than K, it is determined that it is unnecessary.

  As described above, according to the first embodiment, load follow-up control can be performed by charging / discharging the storage battery 2Aa or 2Ba that is not a maintenance target during maintenance.

(Embodiment 2)
FIG. 4 shows a configuration diagram of a power supply system according to Embodiment 2 of the present invention. As shown in the figure, the power supply system according to the second embodiment includes a solar power generation unit 1, two power storage units 2A and 2B that temporarily charge the generated power from the solar power generation unit 1, and maintenance. A specifying means 5 for specifying the power storage means 2A or 2B and a notification means 6 for notifying the power storage means 2A or 2B requiring maintenance are provided. The solar power generation means 1 includes a solar cell 1a, a step-up chopper circuit 1b that appropriately converts the generated power from the solar cell 1a into an optimum voltage, and an inverter circuit 1c that converts DC power into AC power. Yes.

  Next, the flowchart of the specifying means 5 will be described with reference to FIG. As shown in the figure, the specifying unit 5 commands the charge / discharge converters 2Ab and 2Bb to perform charge control so that the discharge depth of each of the power storage units 2A and 2B is 0%. After the depth of discharge is 0%, that is, full charge, it is instructed to discharge at a constant current at a specified value Ik [A]. After the constant current discharge is performed for T [h], the discharge is stopped. After stopping the discharge, the voltages of the storage batteries 2Aa and 2Ba are respectively measured, and the storage battery 2Aa or 2Ba whose measured voltage of the storage batteries 2Aa and 2Ba is lower than the specified voltage Vk [V] is specified as a maintenance target. The specifying means 5 includes a microcomputer programmed according to the flowchart of FIG.

  Next, the structure of the alerting | reporting means 6 is demonstrated, referring FIG. As shown in the figure, the notification means 6 inputs the information of the storage battery 2Aa or 2Ba specified by the specifying means 5 into the information input unit 6a. The information input unit 6a outputs the input result to the display unit 6b, and notifies the display unit 6b by turning on the warning lamp 6ca or 6cb. As the information input unit, there is a microcomputer or the like as long as information can be input.

  As described above, according to the second embodiment, the power storage means 2A or 2B requiring maintenance can be specified, and the user can be notified of the power storage means 2A or 2B requiring maintenance. Become.

(Embodiment 3)
FIG. 7 shows a configuration diagram of a power supply system according to Embodiment 3 of the present invention. As shown in the figure, the power supply system according to the third embodiment is stopped at the time of maintenance by the solar power generation means 1, the two power storage means 2A and 2B that temporarily charge the generated power from the solar power generation means 1. Temporary stopping means 7 is provided. The solar power generation means 1 includes a solar cell 1a, a step-up chopper circuit 1b that appropriately converts the generated power from the solar cell 1a into an optimum voltage, and an inverter circuit 1c that converts DC power into AC power. Yes.

  Next, the structure of the temporary stop means 7 will be described with reference to FIG. As shown in the figure, the temporary stop means 7 is composed of a system stop switch 7a and a command unit 7b for stopping the charge / discharge to the charge / discharge converters 2Ab, 2Bb. When the system stop switch 7a is turned off, the command unit 7b instructs the charge / discharge converters 2Ab, 2Bb to stop charging / discharging.

  As described above, according to the third embodiment, when maintenance of both power storage means 2A and 2B is required, it can be temporarily stopped and work can be performed safely.

(Embodiment 4)
FIG. 9 shows a configuration diagram of a power supply system according to Embodiment 4 of the present invention. As shown in the figure, the power supply system according to Embodiment 4 includes a photovoltaic power generation means 1, two power storage means 2A and 2B that temporarily charge the generated power from the solar power generation means 1, and a blocked power storage means. Current limit value changing means 8 for detecting 2A, 2B, or 2A and 2B and changing the current limit value of charge / discharge control is provided. The solar power generation means 1 includes a solar cell 1a, a step-up chopper circuit 1b that appropriately converts the generated power from the solar cell 1a into an optimum voltage, and an inverter circuit 1c that converts DC power into AC power. Yes.

  Next, a flowchart of the current limit value changing means 8 will be described with reference to FIG. As shown in the figure, the current limit value changing means 8 inputs information on necessity of maintenance of the power storage means 2A, 2B. If only one of the storage batteries 2Aa or 2Ba requires maintenance, the current limit value is halved. Further, if both the storage batteries 2Aa and 2Ba require maintenance, the current limit value is set to zero. If both the storage batteries 2Aa and 2Ba do not require maintenance, the current limit value is set as the initial value.

  As described above, according to the fourth embodiment, it is possible to avoid flowing the charging current of the storage battery 2Aa or 2Ba beyond the specified value by the current limit value changing means 8.

(Embodiment 5)
FIG. 11 shows a configuration diagram of a power supply system according to Embodiment 5 of the present invention. As shown in the figure, the power supply system according to the fifth embodiment includes a photovoltaic power generation means 1, two storage batteries 2Aa and 2Ba connected in series for temporarily charging generated power from the photovoltaic power generation means 1, and a switch A. To F are provided. The solar power generation means 1 includes a solar cell 1a, a step-up chopper circuit 1b that appropriately converts the generated power from the solar cell 1a into an optimum voltage, and an inverter circuit 1c that converts DC power into AC power. Yes.

  Next, ON / OFF control of the switches A to F when charging / discharging the storage batteries 2Aa and 2Ba will be described with reference to FIGS. In FIG. 12, ON means always ON, OFF means always OFF, and chop means duty control. First, the storage battery 2Aa is charged, and when the storage battery 2Ba is not charged / discharged, the switch A and the switch E are always turned on, and the switch F is duty-controlled. Thus, when viewed from the input, it functions as a step-down chopper circuit, and charge control to the storage battery 2Aa is possible by controlling the charge current. At this time, the charging current flows from the switch F through the reactance through the switch A to the storage battery 2Aa, and further through the diode of the switch B through the reactance through the switch E. Similarly, the charging control for the storage battery 2Ba can be performed by always turning on the switches B, C, and D and performing duty control on the switch F. Next, when both the storage batteries 2Aa and 2Ba are charged, the switches A and C are always turned on and the switch F is duty-controlled. Further, when discharging only from the storage battery 2Aa, the reactance in which the switches B and D are duty-controlled, or one of the switches B and D is always ON and the other is duty-controlled and connected in series with the switches A and B. And discharged through the diode of the switch F by the boosted power. Similarly, when discharging only from the storage battery 2Ba, the switch E is duty-controlled to charge the reactance connected in series with the switches B and C through the diodes of the switches B and C, and the switches D and F are boosted by the boosted power. Discharge through the diode. Similarly, when discharging from both the storage batteries 2Aa and 2Ba, the switches D and E are duty-controlled to charge the reactance connected in series with the switches A and C, and the boosted power passes through the diode of the switch F. Discharge.

  As described above, even when the storage batteries 2Aa and 2Ba are connected in series, they can be individually controlled, that is, maintenance can be performed individually.

(Embodiment 6)
FIG. 13 shows a configuration diagram of a power supply system according to Embodiment 6 of the present invention. As shown in the figure, the power supply system according to the sixth embodiment has a photovoltaic power generation means 1 and storage batteries 2Aa and 2Ba that temporarily charge the generated power from the photovoltaic power generation means 1 connected in series. 2C, the bypass control means 9A and 9B for bypassing the charging to the storage battery 2Aa or 2Ba when the storage battery 2Aa or 2Ba is individually shut off, and the number of bypassed storage batteries 2Aa and 2Ba are detected and charged Voltage set value changing means 10a and 10b for changing the voltage set values of the storage batteries 2Aa and 2Ba at the time of control are provided. The solar power generation means 1 includes a solar cell 1a, a step-up chopper circuit 1b that appropriately converts the generated power from the solar cell 1a into an optimum voltage, and an inverter circuit 1c that converts DC power into AC power. Yes.

  Next, the configuration of the bypass control means 9A and 9B will be described with reference to FIG. As shown in the figure, the bypass control means 9A and 9B determine the voltage detectors 9Aa and 9Ba that detect the voltage between the disconnected terminals and whether or not the detected voltage is lower than the specified voltage Vbat_pas. In this case, switch controllers 9Ac and 9Bc for turning on the bypass switches 9Ab and 9Bb are provided.

  Next, the voltage set value changing means 10a and 10b will be described with reference to the flowchart of FIG. 15. As shown in the figure, the voltage set value changing means 10a and 10b input the number of bypassed storage batteries 2Aa or 2Ba. . If the input number is 0, the initial value is adopted. If the number is 1, the voltage set value is halved, and if the number is 2, the voltage set value is zero, that is, charging is prohibited. The voltage set value changing means includes the above-described procedure, a microcomputer programmed with the flowchart of FIG.

  As described above, according to the sixth embodiment, when the storage battery 2Aa or 2Ba is shut off by maintenance, the terminal voltage to which the storage batteries 2Aa and 2Ba are connected is detected and bypassed. Can be operated, and overcharging of the storage batteries 2Aa and 2Ba can be prevented by changing the set value of the charging voltage according to the number of the bypassed storage batteries 2Aa and 2Ba.

(Embodiment 7)
FIG. 16 shows a configuration diagram of a power supply system according to Embodiment 7 of the present invention. As shown in the figure, the power supply system according to the seventh embodiment includes a solar power generation unit 1, two power storage units 2A and 2B that temporarily charge the generated power from the solar power generation unit 1, and maintenance. A notification means 6 that notifies the storage means 2A or 2B and a discharge depth adjustment means 11 that sets the discharge depth of the storage battery 2Ba or 2Aa other than the target storage battery 2Aa or 2Ba to 70% before notification of maintenance are provided. The solar power generation means 1 includes a solar cell 1a, a step-up chopper circuit 1b that appropriately converts the generated power from the solar cell 1a into an optimum voltage, and an inverter circuit 1c that converts DC power into AC power. Yes.

  Next, the discharge depth adjusting means 11 will be described with reference to the control flowchart of FIG. As shown in the figure, the discharge depth adjusting means 11 inputs the necessity of maintenance of the storage batteries 2Aa and 2Ba. When maintenance of the storage battery 2Aa is necessary and maintenance of the storage battery 2Ba is not necessary, the target depth of discharge of the storage battery 2Ba is set to 70%. Conversely, when maintenance of the storage battery 2Aa is unnecessary and maintenance of the storage battery 2Ba is required, the target depth of discharge of the storage battery 2Aa is set to 70%. Moreover, when the maintenance of both storage batteries 2Aa and 2Ba is necessary, or when the maintenance of both storage batteries 2Aa and 2Ba is unnecessary, the process is terminated. The discharge depth adjusting means includes the above-described procedure, a microcomputer programmed with the flowchart of FIG.

  As described above, according to the seventh embodiment, before carrying out maintenance of the storage battery 2Aa or 2Ba, the charging current limit value is increased by setting the discharge depth of the non-target storage battery means 2Ba or 2Aa to 70%. Therefore, it is possible to avoid the output suppression of the power generation means.

  In a power supply system that uses a secondary battery and a power generation means such as a solar battery, wind power generation, or a fuel cell, a system that uses a storage battery as a temporary power storage means to perform load follow-up control and requires continuous operation It can be applied to the usage.

Configuration diagram of power supply system according to Embodiment 1 of the present invention Control flow chart of the individual shut-off means Control flow chart of the maintenance diagnosis means Configuration diagram of power supply system according to Embodiment 2 of the present invention Flow chart of the specifying means Configuration diagram of the notification means Configuration diagram of power supply system according to Embodiment 3 of the present invention Configuration diagram of the suspension means Configuration diagram of power supply system according to Embodiment 4 of the present invention Flow chart of the current limit value changing means Configuration diagram of power supply system according to Embodiment 5 of the present invention Switch control list for each charge / discharge Configuration diagram of power supply system according to Embodiment 6 of the present invention Configuration diagram of the bypass control means Flow chart of voltage set value changing means Configuration diagram of power supply system according to embodiment 7 of the present invention Flow chart of the discharge depth adjusting means Configuration diagram of conventional fuel cell system (Patent Document 1) Configuration diagram of conventional fuel cell system (Patent Document 2) Configuration of conventional backup power supply system Configuration diagram of a conventional power supply system Configuration diagram of a conventional power supply control device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Photovoltaic power generation means 1a Solar cell 1b Boost chopper circuit 1c Inverter circuit 2A, 2B, 2C Power storage means 2Aa, 2Ba Storage battery 2Ab, 2Bb Charge / discharge converter 3 Individual shut-off means 4 Maintenance diagnosis means 5 Specification means 6 Notification means 6a Information input section 6b Display unit 6ca, 6cb Warning lamp 7 Temporary stop means 8 Current limit value changing means 9A, 9B Bypass control means 10a, 10b Voltage set value changing means 11 Discharge depth adjusting means 12 Fuel cell 13 Current control means 14 Power storage means 15 Charging / discharging Control means 16 Commercial power supply 17 Main breaker 18 System current measurement means 19 AC voltage measurement means 20 Fuel cell voltage measurement means 21 Storage voltage measurement means 22 Power conversion means 23 Load 24 External load 25 Secondary battery 26 Fuel cell 27 Storage margin detection Means 28 Surplus Power calculation means 29 Power control means 30 Fuel cell 31 Storage battery 32 Uninterruptible power supply 33 Load 34a-34c Secondary battery 35a-35c Fuel cell 36a-36c Load 37 Control part 38 Efficiency storage part 39a-39b Power storage means 40a-40b Current Measuring means 41 Voltage measuring means 42 Charging / discharging control means 43 State detecting means

Claims (13)

A power supply system characterized in that in a system in which the power of the power generation means is temporarily charged by the power storage means, the system has continuous operation means that enables continuous operation of the system even when the power storage means is stopped. 2. The power supply system according to claim 1, wherein the continuous operation means includes at least two or more power storage means for temporarily charging the generated power from the power generation means, and individual shut-off means for individually shutting off the storage battery. The power supply system according to claim 2, further comprising a maintenance diagnosis unit that diagnoses the necessity of maintenance of the power storage unit. 3. The power supply system according to claim 2, further comprising a specifying unit that specifies a power storage unit that requires maintenance. The power supply system according to claim 2, further comprising an informing unit that informs the storage unit that requires maintenance. 3. The power supply system according to claim 2, further comprising a temporary stop means for stopping during maintenance. 3. The power supply system according to claim 2, wherein surplus power of the power generation means is temporarily charged by power storage means that does not require maintenance during maintenance. 2. The power supply system according to claim 1, wherein the power storage means are connected in parallel. 9. The power supply system according to claim 8, further comprising current limit value changing means for detecting the number of shut-off power storage means and changing a current limit value for charge / discharge control. 2. The power supply system according to claim 1, wherein the power storage means are connected in series. The power supply system according to claim 10, further comprising bypass means for bypassing individually separated storage batteries. 12. The power supply system according to claim 11, further comprising voltage set value changing means for detecting the number of bypassed power storage means and changing a set value of the storage battery voltage during charge control. 6. The power supply system according to claim 5, further comprising a discharge depth adjusting means for setting a depth of discharge other than the target power storage means to 50% to 80% before notification of maintenance.

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