JP2014050265A - Power supply system and power supply control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system and the like capable of stably supplying power to some loads during outage.SOLUTION: A control unit 11 acquires a battery residual amount of a storage battery 5. The battery residual amount can be calculated by integrating charge/discharge amounts acquired continuously from normal time, for example. The control unit 11 also sets a dead zone depending on a charge residual amount from a table stored in a storage unit in advance. The dead zone is a charge/discharge amount range where control is not performed with respect to the charge/discharge amounts for the storage battery 5. Therefore, the control unit 11 basically does not control a power consumption unit 13 and a power generation device 15 and maintains the present state, when the charge/discharge amounts of the storage battery 5 is within the range of the dead zone.

Description

  The present invention relates to a power supply system and a power supply control method during a power failure.

  In recent years, fuel cells and household power generators such as ENE-FARM (registered trademark) and Ecowill (registered trademark) have been used. Such a household power generator cannot generate power alone at the time of a power failure, or can supply electricity only to a small load with respect to the rated capacity. Therefore, it is used in combination with a storage battery to operate during a power failure.

  Such a storage battery can be operated independently and can be used as a standby power source in the event of a power failure. However, the capacity of the storage battery is limited in order to completely cover the normal electricity demand of each household during a power outage over a long period of time.

  At the time of such a power failure, there is a method of suppressing the power consumption of each household to a certain level or less when switching to a standby power supply (Patent Document 1).

JP 2009-247045 A

  In patent document 1, the 1st electric system connected with the apparatus which needs to be operated also at the time of a power failure is allocated, and a breaker is compulsory when the integrated electric energy which the consumer used at the time of a power failure becomes more than predetermined value. It is what you cut into. However, the method of Patent Document 1 may cause a problem depending on the state of charge of the storage battery.

  For example, when the charge amount of the storage battery is close to 100%, excessive power generation by the home generator cannot be absorbed by the storage battery. In addition, when the remaining charge of the storage battery is, for example, 30% or less, there is a possibility that power cannot be supplied.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a power supply system and the like that can stably supply power to some loads during a power failure.

  In order to achieve the above-described object, a first invention is a power supply system that can be used at the time of a power failure, and includes a plurality of power generators, a storage battery that can charge power generated by the power generator, and the power generator. A plurality of power consuming units that consume the generated power or the power charged in the storage battery, and the remaining charge and charge / discharge amount at each time point of the storage battery are monitored to control the power consuming unit and the power generation device A control unit, and the control unit sets a dead zone according to the remaining charge of the storage battery, and when the actual charge / discharge amount for the storage battery exceeds the dead zone, the power generation state of the power generator Or, the power generation device and the power consumption unit are controlled so as to change at least one of the consumption states of the power consumption unit, and the dead zone is changed according to the remaining charge of the storage battery. , Charge remaining of the battery is a power supply system and performs control so that within a predetermined range.

  By doing in this way, according to the charge condition of a storage battery, the electric power generation amount or electric power consumption of an electric power generating apparatus and an electric power consumption part can be controlled. In particular, since the charge / discharge amount range (dead zone) in which the control is not performed is changed according to the state of charge of the storage battery, the remaining charge of the storage battery can be controlled to always fall within a predetermined range. Therefore, the remaining charge of the storage battery can be maintained within a predetermined range. For this reason, while being able to absorb the excessive electric power generation amount from a power generator, the stable electric power supply can be performed also following rapid electric power consumption etc.

  In the present invention, the power consuming unit has a general load and an important load, and the control unit is capable of controlling on / off of the breaker of the general load for each power consuming unit, When the actual charging / discharging amount for the storage battery exceeds the dead band with respect to the excessive charge amount side, the general load breaker is turned on to increase the discharge amount, and for the dead band, the storage battery When the actual charge / discharge amount exceeds the discharge amount excessive side, the general load breaker can be turned off to reduce the discharge amount.

  By doing in this way, the power consumption in a power consumption part can be controlled by the power usage of a general load. Therefore, it is possible to stably use important loads that are particularly required to operate. Moreover, the charge / discharge amount with respect to a storage battery can be contained in a dead zone by controlling the power consumption in a general load. Therefore, the remaining charge of the storage battery can be maintained within a predetermined range.

  Further, in the present invention, when the actual charging / discharging amount for the storage battery exceeds the charging amount excessive side with respect to the dead zone, the control unit is configured to turn on all of the general load breakers. In order to reduce the amount of charge by stopping one of the power generation devices, and when the actual charge / discharge amount with respect to the storage battery exceeds the discharge amount excessive side with respect to the dead zone, all of the breakers of the general load When is turned off, the amount of charge can be increased by starting one of the power generation devices.

  Thus, in this invention, when the charge / discharge amount with respect to a storage battery exceeds a dead zone, priority is given to the on / off control of the breaker of a general load over the control of starting or stopping of a power generator. Therefore, the frequency of starting and stopping of the power generator can be reduced. Normally, the power generation apparatus consumes a large amount of power at the time of start-up, and it takes time until stable power generation can be performed. Therefore, it is desirable to minimize the frequency of starting and stopping of the power generator. According to the present invention, in order to keep the charge / discharge amount for the storage battery within the dead zone, the on / off of the breaker of the general load is first controlled, so that the frequency of starting and stopping of the power generator can be reduced.

  Further, in the present invention, when the actual charge / discharge amount for the storage battery is within the dead zone, the control unit includes the off-state general load and the non-operating power generation device. In this case, one of the power generation devices can be activated.

  As described above, even when the charge / discharge amount with respect to the storage battery is stable in the dead zone, when there is a general load in the off state and there is a stopped power generation device, one power generation device is activated. For this reason, electric power generation amount can be increased. In this way, when the charge / discharge amount exceeds the dead zone, it is possible to control the charge / discharge amount with respect to the storage battery to be within the dead zone by increasing the usage amount of the general load. For this reason, electric power can be supplied to as many general loads as possible.

  In the present invention, the control unit determines that the actual charge / discharge amount for the storage battery exceeds the dead zone when the actual charge / discharge amount for the storage battery continuously exceeds the dead zone for a predetermined time. It is desirable.

  By doing in this way, when the charge-and-discharge amount with respect to a storage battery fluctuates instantaneously, it can prevent controlling an electric power consumption part and an electric power generating device sensitively.

  Further, in the present invention, the control unit acquires the initial power consumption immediately before the power failure, sets the required number of operating power generation devices according to the initial power usage amount, When the number of operating power generation devices immediately before is small, the power generation devices are activated so that the required number of operation power generation devices is reached, and when there are a plurality of power generation devices to be activated, the power generation devices are opened after a predetermined time. It is desirable to start up sequentially.

  By doing in this way, according to the electric power used at the time of a power failure, the operating number of power generators can be started quickly. At this time, since the operation of the power generation device is performed at predetermined time intervals, it is possible to prevent a large amount of power for starting up from being consumed at one time.

  In the present invention, the solar power generation device may be further included, and the control unit may disconnect the solar power generation device immediately after a power failure and start the power generation device after a predetermined time has elapsed. In the case where the amount of power generated by the solar power generation device is a specified value or more, the solar power generation device is activated instead of the power generation device activation, and the power generation by the solar power generation device is performed. Thus, when it is necessary to stop the power generation device, the solar power generation device can be disconnected instead of stopping the power generation device.

  Thus, when using a solar power generation device together, a solar power generation device is disconnected until an electric power supply system is stabilized. Thereby, the unstable factor of charge amount can be reduced. Further, after the power supply system is stabilized, the solar power generation device is activated when the power generation amount of the solar power generation device is sufficient. By doing in this way, charge amount can be increased. That is, power consumption can be increased. Moreover, since it replaces with a stop of a power generator and gives priority to the disconnection of a solar power generator, the starting and stop frequency of a power generator can be reduced.

  A second invention is a power supply control method at the time of a power failure, wherein a plurality of power generation devices, a storage battery capable of charging power generated by the power generation device, and power generated by the power generation device or the storage battery A power supply system comprising: a plurality of power consuming units that consume charged power; and monitoring a remaining charge amount and a charge / discharge amount at each time point of the storage battery, and a dead zone according to the remaining charge amount of the storage battery When the actual charge / discharge amount for the storage battery exceeds the dead zone, the power generation state of the power generation device or the consumption state of the power consumption unit is changed, and the storage battery is charged according to the remaining charge of the storage battery. The power supply control method is characterized in that the dead battery is changed to control the remaining charge of the storage battery to be within a predetermined range.

  By doing in this way, the charge remaining amount of a storage battery can be maintained in a predetermined range, and electric power can be supplied stably.

  ADVANTAGE OF THE INVENTION According to this invention, the electric power supply system etc. which can supply electric power stably with respect to one part load at the time of a power failure can be provided.

1 is a block diagram showing a power supply system 1. FIG. 3 is a flowchart showing a control method of the power supply system 1. The figure which shows the example of a setting of the dead zone (charge / discharge amount range which does not perform control) by the charge remaining amount of the storage battery. 3 is a flowchart showing a control method of the power supply system 1. 3 is a flowchart showing a control method of the power supply system 1. 3 is a flowchart showing a control method of the power supply system 1. 3 is a flowchart showing a control method of the power supply system 1.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a power supply system 1. The power supply system 1 includes a storage battery 5, a control unit 11, a power consumption unit 13, a power generation device 15, and the like. The power supply system 1 is a system that uses a single storage battery 5 for a plurality of consumers (power consumption unit 13) and a plurality of power generation devices 15.

  A plurality of power generation devices 15 are arranged and can be operated independently. The power generation device 15 is, for example, a fuel cell or a gas engine, and a known home power generation device can be applied.

  The power consuming unit 13 is, for example, each household in an apartment house. Therefore, in this embodiment, there are a plurality of power consuming units (customers). In the power consumption unit 13, the important load 23 and the general load 19 are distinguished. The important load 23 is a part that consumes the minimum necessary power even during a power failure. For example, minimum lighting and communication means.

  The general load 19 is normally used for home appliances and the like. A breaker 21 that can be remotely turned on / off is connected to the general load 19. When the breaker 21 is turned off, the corresponding general load 19 cannot be used. In the important load 23, a breaker (not shown) is arranged, and when a predetermined amount of power is used, a forced trip can be performed.

  In addition, although illustration is abbreviate | omitted, the power consumption part 13 has the important load in a common part other than the load in each household. A common area is a common area in an apartment house, for example, lighting for the entrance or stairs of an apartment house, moving means such as an elevator, alarm equipment, etc. It is a control power supply or the like necessary for operation, and has a circuit configuration in which power supply continues even during a power failure, similar to the important load 23 in each home.

  The control unit 11 is a computer, for example, and controls the power consumption unit 13 and the power generation device 15. Specifically, the control unit 11 can switch on / off of the breaker 21 in each power consumption unit 13. Moreover, the control part 11 can start or stop each electric power generating apparatus 15 each independently.

  The control unit 11 is supplied with driving power from the storage battery 5. Moreover, the control part 11 acquires continuously the charging / discharging amount with respect to the storage battery 5 with the wattmeter 17. FIG. Thereby, the control part 11 can acquire the charge remaining amount (ratio with respect to the full charge amount from the minimum charge amount which can be used effectively) of the storage battery 5. FIG.

  The wattmeter 17 is installed between the line connecting the power generation device 15 and the power consuming unit 13 and the storage battery 5. Therefore, when the total amount of power generated by the power generation device 15 and the total power consumption in the power consumption unit 13 match, charging / discharging from the storage battery 5 is not performed. That is, the storage battery 5 is charged / discharged according to the balance between the total amount of power generated by the power generation device 15 and the total power consumption consumed by the power consumption unit 13.

  For example, when the total power generation amount generated by the power generation device 15 is larger than the total power consumption consumed by the power consumption unit 13, the surplus is charged in the storage battery 5. In addition, when the total power consumption consumed by the power consumption unit 13 is larger than the total power generation amount generated by the power generation device 15, the shortage is discharged from the storage battery 5. The control unit 11 sequentially monitors the actual charge / discharge amount with respect to the storage battery 5 and calculates the remaining charge amount of the storage battery 5. In addition, when the remaining charge amount can be grasped from the output voltage of the storage battery 5 or the like, the remaining charge amount may be acquired by a method other than monitoring of the accumulated charge / discharge amount.

  Next, the operation of the power supply system 1 will be described. The power supply system 1 is connected to the AC distribution line 3. Normally, power can be supplied from the AC distribution line 3, and the power load of the power consumption unit 13 can be stably covered by the total power supply including the power supply by the power generation device 15. On the other hand, when a power failure occurs, a power failure sequence 9 is activated and the power failure cutoff switch 7 is disconnected. The control unit 11 and the power generation device 15 can be operated by the storage battery 5 that operates independently.

  2 to 7 are flowcharts showing a control method by the control unit 11. As shown in FIG. 2, the control unit 11 first acquires the number of power generation devices 15 that were operating immediately before the power failure and the total power load in the dedicated unit and the important load. For example, the control unit 11 monitors the number of operating power generators 15 and the power load such as a dedicated unit every predetermined time, and stores them in a storage unit (memory or the like). When a power failure occurs, the control unit 11 acquires the latest power generation device operation number information and power load information such as a dedicated unit from the storage unit.

  Moreover, the control part 11 sets the required number of operating power generators corresponding to the power load information of the power generator operating unit information immediately before the power failure and the dedicated part from the table stored in the storage unit in advance (step 101). . For example, when the power generation amount of the power generation device 15 is 1 kW and the power consumption amount in the dedicated unit or the like is 5.5 to 6.5 kW, the required number of operation power generation devices is set to six.

  Next, the control unit 11 compares the required number of operating power generators with the number of operating power generators immediately before the power failure, and activates the power generator 15 as necessary. For example, in the above-described example, when four power generation devices 15 are operating immediately before a power failure, the remaining two power generation devices 15 are started to operate. At this time, when starting the plurality of power generation devices 15, they are not started simultaneously but sequentially started with a predetermined time interval (step 102). This is because a large amount of power is consumed to start up the power generation device 15, and a large amount of power is unnecessary by avoiding simultaneous startup of a plurality of units. The predetermined interval may be about 5 minutes, for example.

  Next, the control unit 11 acquires the remaining charge of the storage battery 5. For example, as described above, the remaining charge amount can be calculated by accumulating the amount of charge / discharge acquired continuously from the normal time. Moreover, the control part 11 sets the dead zone according to the charge remaining amount from the table previously memorize | stored in the memory | storage part (step 103). The dead zone is a charge / discharge amount range in which control is not performed according to the remaining charge of the storage battery 5. That is, when the charge / discharge amount with respect to the storage battery 5 is within the range of the dead zone, the control unit 11 basically does not control the power consumption unit 13 and the power generation device 15 and maintains the current state.

  FIG. 3 is a diagram illustrating an example of setting a dead zone. For example, when the remaining charge of the storage battery 5 is less than 50%, the dead zone is set to -4 kW to 0 kW. Similarly, when the remaining charge of the storage battery 5 is 50% to 70%, the dead band is set to -2 kW to 2 kW, and when the remaining charge of the storage battery 5 exceeds 70%, the dead band is 0 kW to Set to 4 kW. Here, the negative dead zone indicates the amount charged to the storage battery 5, and the positive dead zone indicates the amount discharged from the storage battery 5. That is, being -2 kW or more indicates that the charge amount is 2 kW or less. Moreover, it is 2 kW or less means that the amount of discharge is 2 kW or less.

  By doing in this way, the charge remaining amount of the storage battery 5 is controlled so that it may always fall in the range of 50% to 70%. For example, when the remaining charge level is 80%, which is excessive, the dead zone lower limit is 0 kW, and thus the dead zone is exceeded when the storage battery 5 is charged. In this case, control by the control unit 11 is performed, and for example, the discharge amount is increased. In addition, when the remaining charge is 40%, which is the underside, the upper limit of the dead zone is 0 kW, and thus the dead zone is exceeded when the storage battery 5 is discharged. In this case, control by the control part 11 is made and the discharge amount is suppressed.

  As described above, by setting the remaining charge amount of the storage battery 5 within a predetermined range, it becomes possible to stably supply power, and the generated power can be used effectively. For example, if the remaining charge amount is excessive, the power generated by the power generation device 15 cannot be absorbed more than the power consumption. In addition, when the remaining charge amount is too low, it becomes impossible to cope with a sudden change in power consumption or instantaneous power consumption. Therefore, it is desirable that the remaining amount of charge of the storage battery 5 is not too much, not too small, and is within an appropriate range.

  The upper and lower limits of the remaining charge level for setting the dead band and the upper and lower limits of the dead band are not limited to the example shown in FIG. 3, and may be set to values suitable for the entire system. Further, the dead zone may be set more finely by further increasing the remaining charge category.

  Next, the control unit 11 compares the set dead zone with the actual charge / discharge amount of the storage battery 5 at that time (step 104). The charge / discharge amount can be acquired by the wattmeter 17, for example.

  Next, the control part 11 determines whether the actual charging / discharging amount with respect to the storage battery 5 is in the range of a dead zone (step 105). For example, in the example illustrated in FIG. 3, when the remaining charge of the storage battery 5 is 60%, the dead zone is set to −2 kW to 2 kW. Therefore, if the charge / discharge amount with respect to the actual storage battery 5 is -1 kW (charge amount is 1 kW), the dead zone is within the range. In this case, the process proceeds to control D.

  Note that the control D described later is not necessarily required. If the control D is not used, the process may return to step 103. Further, the control based on the comparison between the dead zone and the charge / discharge amount in step 105 can be prevented from being performed for a predetermined time after the occurrence of a power failure. This is because, since the power generation amount is unstable until the power generation device after the start-up stably generates power, such as when the power generation device is started after a power outage, step 105 is started after the charge / discharge amount is stabilized. You may do it. For example, after step 103, each process may proceed 90 to 120 minutes after the occurrence of a power failure.

  Next, the control part 11 determines whether the charging / discharging amount with respect to the storage battery 5 has exceeded any of the upper and lower limits of a dead zone (step 106). When the charge / discharge amount for the storage battery 5 falls below the lower limit of the dead zone, the process proceeds to Control A, and when the charge / discharge amount for the storage battery 5 falls below the lower limit of the dead zone, the process proceeds to Control B.

  FIG. 4 is a flowchart showing the control A. That the charge / discharge amount of the storage battery 5 is less than the lower limit of the dead zone means that the charge amount is too much with respect to the dead zone. Therefore, the control which reduces the charge to the storage battery 5 by the following control is performed.

  First, the control unit 11 determines whether or not the state in which the charge / discharge amount is below the lower limit value of the dead zone continues for a predetermined time or longer (step 200). If it is within the predetermined time, it is determined whether or not the charge / discharge amount returns to the dead zone until the predetermined time elapses (step 201). If the charge / discharge amount returns within the dead zone within the predetermined time, the process returns to step 103. Here, the predetermined time may be about several minutes, for example. By doing so, it is possible to prevent excessive control when the dead zone is instantaneously exceeded due to variations in power consumption and power generation.

  When the charge / discharge amount does not return to the dead zone within the predetermined time (that is, when the state where the charge / discharge amount falls below the lower limit of the dead zone continues for the predetermined time), the control unit 11 turns off. It is determined whether there is a breaker 21 in the state (step 202). If there is a breaker 21 in the off state, one breaker 21 is turned on (step 204). That is, the general load 19 that could not be used can be used. Therefore, power consumption increases.

  If there is no circuit breaker 21 in the off state, the general load 19 cannot be increased any more. Therefore, in this case, one power generation device 15 is stopped (step 203). As a result, the total amount of power generated by the power generation device 15 decreases. That is, in any of steps 203 and 204, the charge amount for the storage battery 5 can be reduced. After performing the above control, the process returns to step 103.

  On the other hand, as described above, when the charge / discharge amount of the storage battery 5 exceeds the upper limit of the dead zone, the process proceeds to the control B. FIG. 5 is a flowchart showing the control B. That the charge / discharge amount of the storage battery 5 exceeds the upper limit of the dead zone means that the discharge amount is too much with respect to the dead zone. Therefore, the control which reduces the discharge from the storage battery 5 by the following control is performed.

  First, the control unit 11 determines whether or not the state in which the charge / discharge amount exceeds the upper limit value of the dead zone continues for a predetermined time or longer (step 300). If it is within the predetermined time, it is determined whether or not the charge / discharge amount returns to the dead zone until the predetermined time elapses (step 301). If the charge / discharge amount returns within the dead zone within the predetermined time, the process returns to step 103.

  When the charge / discharge amount does not return to the dead zone within the predetermined time (that is, when the charge / discharge amount exceeds the upper limit of the dead zone for a predetermined time or longer), the control unit 11 It is determined whether or not the breaker 21 is in the off state (step 302). If there is a breaker 21 in the on state, one breaker 21 is turned off (step 303). That is, the used general load 19 is made unusable. Therefore, power consumption is reduced.

  If there is no breaker 21 in the on state, the general load 19 cannot be reduced any further. Therefore, in this case, one power generation device 15 is activated (step 304). As a result, the total amount of power generated by the power generation device 15 increases. That is, in any of steps 303 and 304, the amount of discharge from the storage battery 5 can be reduced. After performing the above control, the process returns to step 103.

  By repeating the above control, the remaining charge of the storage battery 5 can be maintained within a predetermined range. In addition, the total amount of power generated by the power generation device 15 and the total amount of power consumed by the power consumption unit 13 can be balanced.

  Next, control when the charge / discharge amount for the storage battery 5 is within the range of the dead zone will be described. FIG. 6 is a flowchart showing the control D. As described above, when the charge / discharge amount with respect to the storage battery 5 is within the range of the dead band, the total power generation amount by the power generation device 15 and the total power consumption amount in the power consumption unit 13 are balanced. 11 basically does not need to control the power generation device 15 or the power consumption unit 13. However, the control unit 11 performs the following control so that the balance between the total power generation amount by the power generation device 15 and the total power consumption by the power consumption unit 13 is in an appropriate state.

  First, the control unit 11 determines whether or not a predetermined time has elapsed since the start of the power failure (step 400). If it is within the predetermined time, the process returns to step 103. This is the time until the control by the above-described control B and C is prioritized and the charge / discharge balance changed thereby is stabilized. For example, the following control may be started about 1 to 2 hours after the start of the power failure.

  When a predetermined time has elapsed since the start of the power failure, the control unit 11 determines whether there is an off-state breaker 21 (step 401). When there is no circuit breaker 21 in the off state, that is, when all the general loads 19 are usable, no further control is performed and the process returns to Step 103.

  If there is an off-state breaker 21, the control unit 11 next determines whether or not there is a power generation device 15 that is stopped (step 402). If all the power generation devices 15 are in operation, no further control is performed and the process returns to step 103.

  If there is a power generation device 15 that is stopped, the control unit 11 activates one power generation device 15 (step 403). After performing the above control, the process returns to step 103. In this way, the total power generation amount can be increased. Therefore, after returning to step 103, when the power generation of the power generation device 15 is started and stabilized, the charge amount becomes excessive, and the control shifts to control A.

  That is, when one power generation device 15 starts operating, the total power generation amount increases. Therefore, the charge / discharge amount falls below the lower limit of the dead zone. In this case, since the breaker 21 in the off state is turned on (step 204), the total power generation amount by the power generation device 15 and the total power consumption amount in the power consumption unit 13 can be balanced. Further, by making it possible to use as many general loads as possible, the consumer can further eliminate the inconvenience caused by the power outage.

  Next, an example in which a photovoltaic power generator is further added to the power generator 15 shown in FIG. 1 will be described. FIG. 7 is a flowchart showing control on the photovoltaic power generation apparatus. First, the control unit 11 disconnects all the solar power generation devices simultaneously with the occurrence of a power failure (step 500). That is, the solar power generation device is disconnected from the power supply system 1.

  Next, the control unit 11 determines whether or not a predetermined time has elapsed since the start of the power failure (step 501). The amount of power generated by the solar power generation device is unstable depending on the weather and time. For this reason, the electric power generated by the solar power generator is not used until the power supply system 1 is stably controlled. Therefore, the process does not proceed until the predetermined time has elapsed.

  If it is after a predetermined time has elapsed since the occurrence of a power failure, the control unit 11 determines whether the amount of power generated by the solar power generation device is equal to or greater than a predetermined value (step 502). When the amount of power generated by the solar power generation device is not sufficient, the power supply system 1 is not used.

  When the amount of power generated by the solar power generation device is equal to or greater than a predetermined value, the control unit 11 sequentially activates the solar power generation device and starts power generation together with the power generation device 15 (step 503). As described above, power generation by the solar power generation device can be used while the power supply system 1 is stable.

  Note that when the amount of power generated by the solar power generation device becomes equal to or less than a predetermined value, the power balance of the system becomes difficult to stabilize, and the solar power generation device may be disconnected again. That is, the control unit 11 may monitor the power generation amount of the solar power generation device and control the solar power generation device to be used only when the power generation amount is equal to or greater than a predetermined value.

  In addition, while the solar power generation device is in operation, the control unit 11 can control the solar power generation device in the same manner as the power generation device 15. For example, instead of starting the power generation device 15, the solar power generation device can be started, and instead of stopping the power generation device 15, the solar power generation device can be disconnected. That is, the solar power generation device may be operated when the power generation amount is equal to or greater than a predetermined value and the power generation device 15 needs to be activated. In this way, the startup or stop frequency of the power generation device 15 can be reduced by giving priority to the start and stop of the solar power generation device over the start and stop of the power generation device 15.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1 ......... Power supply system 3 ......... AC distribution line 5 ......... Storage battery 7 ......... Power failure cut-off switch 9 ......... Power failure sequence 11 ......... Control part 13 ......... Power consumption part 15 ......... Power generation device 17 ......... Power meter 19 ......... General load 21 ......... Breaker 23 ......... Important load

Claims (8)

A power supply system that can be used in the event of a power failure,
A plurality of power generators;
A storage battery capable of charging the power generated by the power generation device;
A plurality of power consumption units that consume power generated by the power generation device or power charged in the storage battery;
A control unit that monitors a remaining charge amount and a charge / discharge amount at each time point of the storage battery, and controls the power consumption unit and the power generation device;
Comprising
The controller is
A dead zone is set according to the remaining charge of the storage battery, and when the actual charge / discharge amount for the storage battery exceeds the dead zone, at least one of the power generation state of the power generation device or the consumption state of the power consumption unit is set. Control the power generator and the power consuming unit to change,
A power supply system, wherein the dead zone is changed in accordance with the remaining charge of the storage battery so as to control the remaining charge of the storage battery within a predetermined range. The power consuming unit has an important load that is particularly required to operate even during a power failure, and a general load whose use is preferentially restricted during a power failure,
The controller is
It is possible to control on / off of the breaker of the general load for each power consuming unit,
For the dead zone, when the actual charge / discharge amount for the storage battery exceeds the excessive charge amount side, turn on the general load breaker to increase the discharge amount,
The amount of discharge is reduced by turning off one breaker of the general load when the actual charge / discharge amount with respect to the storage battery exceeds the discharge amount excessive side with respect to the dead zone. 1. The power supply system according to 1. The controller is
When the actual charge / discharge amount for the storage battery exceeds the dead zone with respect to the excessive charge amount side, if all of the breakers of the general load are on, one power generation device is stopped. Reduce the amount of charge
When the actual charging / discharging amount of the storage battery exceeds the dead zone with respect to the excessive discharge amount side, when all of the breakers of the general load are off, one of the power generation devices is started. The power supply system according to claim 2, wherein the charging amount is increased. The controller is
When the actual charge / discharge amount with respect to the storage battery is within the dead zone, when the general load in the off state exists and the non-operating power generation device exists, one power generation device is activated. The power supply system according to claim 2, wherein the power supply system is a power supply system.   The said control part judges that the actual charging / discharging amount with respect to the said storage battery exceeded the said dead zone, when the actual charging / discharging amount with respect to the said storage battery exceeded the said dead zone continuously for the predetermined time. The power supply system according to any one of claims 1 to 4. The controller is
Obtain the initial power consumption just before the power failure,
Set the required number of operating power generators according to the initial power consumption,
When the number of operating power generation devices immediately before a power failure is small with respect to the number of required operating power generation devices, the power generation devices are activated so that the number of required operating power generation devices is reached,
6. The power supply system according to claim 1, wherein when there are a plurality of power generation devices to be activated, the power generation devices are sequentially activated with a predetermined time interval. Furthermore, it has a solar power generation device,
The control unit disconnects the photovoltaic power generator immediately after a power failure,
When it is necessary to start the power generation device after a predetermined time has elapsed, and the amount of power generated by the solar power generation device is greater than or equal to a specified value, the solar power generation device is used instead of starting the power generation device. Start
When it is necessary to stop the power generation device in a state where power generation is performed by the solar power generation device, the solar power generation device is disconnected instead of stopping the power generation device. The power supply system according to any one of claims 1 to 6. A power supply control method during a power failure,
A plurality of power generators;
A storage battery capable of charging the power generated by the power generation device;
A plurality of power consumption units that consume power generated by the power generation device or power charged in the storage battery;
Using a power supply system comprising
The remaining charge and charge / discharge amount at each time point of the storage battery is monitored, a dead band is set according to the remaining charge amount of the storage battery, and when the actual charge / discharge amount for the storage battery exceeds the dead band, Change the power generation state of the power generation device or the consumption state of the power consumption unit,
A power supply control method, wherein the dead zone is changed in accordance with a remaining charge of the storage battery to control the remaining charge of the storage battery to be within a predetermined range.

Images