JP2011083088A - Dc power distribution system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a DC power distribution system capable of preferably distributing power of a distributed power supply source during power failure while controlling the entire system. <P>SOLUTION: A power supply destination of a storage battery is set depending on whether a time zone when a power failure has occurred is daytime or night-time and on the residual capacity of the storage battery at the occurrence of power failure. In this way, power of the storage battery can be preferably distributed during power failure. Determination of day or night is executed by a control circuit on the basis of the present time to be measured with a timer. Accordingly, the power supply to each of DC devices or power interruption thereof can be well controlled when a power failure occurs. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a DC power distribution system.

  In recent years, an AC / DC converter (AC / DC converter) that converts AC power supplied from a power system into DC power and a distributed power source such as a solar cell or a fuel cell are linked to distribute DC power to a DC load. DC power distribution systems are attracting attention. For example, Patent Document 1 discloses the following DC power distribution system. That is, when the control device of the system detects that the main power supply has failed, it transmits power failure information to each DC device. In each DC device that has received this power failure information, when the current time is its own operating time zone, the switching unit provided on its own power supply path is kept closed. As a result, DC power is supplied from the distributed power source to its own operating part. On the other hand, when the current time is not in its own operating time zone, the switching unit switches from the closed state to the open state, and the supply of DC power from the distributed power source to the operating part is stopped. Thereby, power consumption on each DC device side is suppressed. After that, when the main power supply is restored and each DC device receives the restoration information from the control device of the system, the switching unit switches from the open state to the closed state, and the DC power is supplied from the distributed power source to the operating part. Is resumed.

JP 2009-159780 A

  However, the conventional power distribution system has the following problems. That is, at the time of a power failure, it is determined whether or not the current operating time zone is based on the current time information measured by the timekeeping unit of each DC device. However, it is assumed that the time measured by the time measuring unit varies for each DC device. In this case, there is a possibility that variations may occur in the determination of whether or not it is the operation time of each DC device.

  For this reason, there exists a possibility that operation | movement of the apparatus which requires operation | movement at the time of a power failure cannot be maintained suitably. That is, when the main power supply fails, the operation of the DC device that is immediately determined to be its own operation time is suitably maintained using the power of the distributed power supply. However, if the determination that the operation time is delayed due to a shift in the current time despite the original operation time, the operation of the DC device may stop until the determination is made. is there. Similarly, for DC devices whose operation should be stopped at the time of a power failure, it is conceivable that the operation is not stopped at an appropriate timing due to variations in the current time measured in them. That is, there is a risk that DC power from the distributed power supply is supplied to a DC device that should be immediately shut off when a power failure occurs. In this case, there is a possibility that power saving on each DC device side during a power failure may not be suitably performed.

  As described above, in the conventional power distribution system, it is not possible to properly control the operation of each DC device, and there is a concern that the DC power from the distributed power source may not be appropriately distributed at the time of a power failure. There was room for improvement in this regard.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a DC power distribution system capable of suitably distributing power of distributed power sources during a power failure while controlling the entire system. There is to do.

  The invention according to claim 1 is a case in which AC power supplied from a commercial power source is converted into DC power, the DC power is supplied to a power storage device and a plurality of DC devices, and a power failure of the commercial power source is detected. In the DC power distribution system that supplies the DC power stored in the power storage device to each DC device, when a power failure is detected, control for setting the DC device to be supplied based on the time at that time The gist of the present invention is to provide an apparatus.

  According to the present invention, a DC device to be supplied with power during a power failure is set by the control device. For this reason, about the electric power distribution of the electrical storage apparatus at the time of a power failure, control of the whole system is achieved through a control apparatus. In addition, since the DC device that is the target of power supply is set based on the time when the power failure occurs, it is also possible to set the DC device suitable for the time zone including that time as the power supply target at the time of the power failure Become. For this reason, the electric power stored in the power storage device can be suitably distributed.

  According to a second aspect of the present invention, in the direct current distribution system according to the first aspect, the control device sets a direct current device to be used as a power supply destination at the time of a power failure in consideration of a remaining capacity of the power storage device. The gist.

According to the present invention, by taking into account the remaining capacity of the power storage device, it is possible to appropriately distribute power according to the remaining capacity.
According to a third aspect of the present invention, in the DC power distribution system according to the first or second aspect, each DC device is preset with a priority of power supply during a power failure, and the control device If detected, the power supply time to each DC device is set longer as the DC device having a higher priority, and the power of the power storage device is supplied to each DC device, and the time when a power failure is detected When it is detected that the power supply time has passed with reference to the power supply, the power supply to the DC device set to the power supply time is cut off.

  According to the present invention, the power supply time to a DC device with a low priority is set short, and the power supply time to a DC device with a high priority is set long. That is, at the time of a power failure, the supply of power is cut off in order from the DC device with the lowest priority. For this reason, it becomes possible to use a DC apparatus with a high priority as long as possible.

The gist of a fourth aspect of the present invention is the DC power distribution system according to the third aspect, wherein the control device sets the power supply time according to the remaining capacity of the power storage device.
ADVANTAGE OF THE INVENTION According to this invention, appropriate electric power distribution according to not only the priority of the electric power supply at the time of a power failure but the remaining capacity of an electrical storage apparatus is attained.

  According to a fifth aspect of the present invention, in the DC power distribution system according to any one of the first to fourth aspects, when a power failure is detected, the control device performs day and night based on the time at that time. A DC power distribution system that determines and sets DC devices to be supplied based on the determination result.

  According to the present invention, it is assumed that the priority of power supply differs between daytime and nighttime during a power failure. For example, during the daytime, it is considered that the necessity of supplying power to DC devices such as lighting devices is low. For this reason, suitable electric power distribution becomes possible according to the time zone when a power failure occurred.

  ADVANTAGE OF THE INVENTION According to this invention, the power distribution of a distributed power supply can be performed suitably at the time of a power failure, aiming at control of the whole DC power distribution system.

The block diagram which shows the outline of a DC power distribution system. The block diagram which shows the structure of a control unit. The block diagram which shows the priority of the DC apparatus in 1st Embodiment. The table | surface which similarly shows the table data which prescribes | regulates the relationship between the various situations at the time of a power failure, and DC apparatus to which electric power is supplied. The flowchart which shows the electric power feeding process procedure at the time of the power failure by a DC power distribution system. The table | surface which shows the table data which prescribes | regulates the relationship between the various conditions at the time of the power failure of 2nd Embodiment, and DC apparatus to which electric power is supplied. The table | surface which shows the example of a setting of the electric power supply time to each DC apparatus at the time of the power failure of 3rd Embodiment. The flowchart which shows the electric power feeding process procedure at the time of a power failure by a direct-current power distribution system.

Hereinafter, a first embodiment in which the present invention is embodied in a residential power distribution system will be described with reference to FIGS. First, an outline of the system will be described.
<Outline of power distribution system>
As shown in FIG. 1, a house is provided with a power supply system 1 that supplies power to various devices (such as lighting devices, air conditioners, home appliances, and audiovisual devices) installed in the house. The power supply system 1 operates various devices using a household commercial power supply (AC power supply) 2 as power, and also supplies power to the various devices as power from a solar cell 3 that generates power using sunlight. The power supply system 1 supplies power to an AC device 6 that operates by inputting an AC power supply (AC power supply) in addition to a DC device 5 that operates by inputting a DC power supply (DC power supply).

  The power supply system 1 is provided with a control unit 7 and a DC distribution board (built-in DC breaker) 8 as a distribution board of the system. The power supply system 1 is provided with a control unit 9 and a relay unit 10 as devices for controlling the operation of the DC device 5 in the house.

  An AC distribution board 11 for branching an AC power supply is connected to the control unit 7 via an AC power line 12. The control unit 7 is connected to the commercial power source 2 through the AC distribution board 11 and is connected to the solar cell 3 through the DC system power line 13. The control unit 7 takes in AC power from the AC distribution board 11 and DC power from the solar cell 3 and converts these powers into predetermined DC power as a device power source. Then, the control unit 7 outputs the converted DC power to the DC distribution board 8 via the DC system power line 14 or outputs it to the storage battery 16 via the DC system power line 15 to store the same power. To do. The control unit 7 can not only take AC power from the AC distribution board 11 but also convert the power of the solar cell 3 and the storage battery 16 to AC power and supply it to the AC distribution board 11. The control unit 7 exchanges data with the DC distribution board 8 via the signal line 17.

  The DC distribution board 8 is a kind of breaker that supports DC power. The DC distribution board 8 branches the DC power input from the control unit 7 and outputs the branched DC power to the control unit 9 via the DC power line 18 or relays via the DC power line 19. Or output to the unit 10. Further, the DC distribution board 8 exchanges data with the control unit 9 via the signal line 20 and exchanges data with the relay unit 10 via the signal line 21.

  A plurality of DC devices 5, 5... Are connected to the control unit 9. These DC devices 5 are connected to the control unit 9 via a DC supply line 22 that can carry both DC power and data by a pair of lines. The DC supply line 22 superimposes a communication signal for transmitting data by a high-frequency carrier wave on a DC voltage serving as a power source for the DC device, so-called power line carrier communication. Transport to. The control unit 9 acquires the DC power supply of the DC device 5 via the DC power line 18 and controls which DC device 5 based on the operation command obtained from the DC distribution board 8 via the signal line 20. Know what to do. Then, the control unit 9 controls the operation of the DC device 5 by outputting a DC voltage and an operation command to the instructed DC device 5 via the DC supply line 22.

  A switch 23 that is operated when switching the operation of the DC device 5 in the house is connected to the control unit 9 via a DC supply line 22. In addition, a sensor 24 that detects a radio wave transmitted from an infrared remote controller, for example, is connected to the control unit 9 via a DC supply line 22. Therefore, not only the operation instruction from the DC distribution board 8 but also the operation of the switch 23 and the detection of the sensor 24, a communication signal is sent to the DC supply line 22 to control the DC device 5.

  A plurality of DC devices 5, 5... Are connected to the relay unit 10 via individual DC power lines 25. The relay unit 10 acquires the DC power supply of the DC device 5 through the DC power line 19 and determines which DC device 5 is to be operated based on an operation command obtained from the DC distribution board 8 through the signal line 21. To grasp. The relay unit 10 controls the operation of the DC device 5 by turning on / off the power supply to the DC power line 25 with respect to the instructed DC device 5 using a built-in relay. Further, the relay unit 10 is connected to a plurality of switches 26 for manually operating the DC device 5, and the DC power line 25 is turned on / off by the relay by operating the switch 26, so that the DC The device 5 is controlled.

  The DC distribution board 8 is connected to a DC outlet 27 built in a house in the form of a wall outlet or a floor outlet, for example, via a DC power line 28. If a plug (not shown) of a DC device is inserted into the DC outlet 27, DC power can be directly supplied to the device.

  Further, between the commercial power source 2 and the AC distribution board 11, a power meter 29 capable of remotely metering the usage amount of the commercial power source 2 is connected. The power meter 29 is equipped with not only a function of remote meter reading of the amount of commercial power used, but also a function of power line carrier communication and wireless communication, for example. The power meter 29 transmits the meter reading result to an electric power company or the like via power line carrier communication or wireless communication.

  The power supply system 1 is provided with a network system 30 that enables various devices in the home to be controlled by network communication. The network system 30 is provided with a home server 31 as a control unit of the system. The home server 31 is connected to a management server 32 outside the home via a network N such as the Internet, and is connected to a home device 34 via a signal line 33. The in-home server 31 operates using DC power acquired from the DC distribution board 8 via the DC power line 35 as a power source.

  A control box 36 that manages operation control of various devices in the home by network communication is connected to the home server 31 via a signal line 37. The control box 36 is connected to the control unit 7 and the DC distribution board 8 via the signal line 17 and can directly control the DC device 5 via the DC supply line 38. For example, a gas / water meter 39 capable of remotely metering the amount of gas used or the amount of water used is connected to the control box 36 and also connected to the operation panel 40 of the network system 30. The operation panel 40 is connected to a monitoring device 41 including, for example, a door phone slave, a sensor, and a camera.

  When the in-home server 31 inputs an operation command for various devices in the home via the network N, the home server 31 notifies the control box 36 of the instruction, and operates the control box 36 so that the various devices operate in accordance with the operation command. . The in-home server 31 can provide various information acquired from the gas / water meter 39 to the management server 32 through the network N, and accepts from the operation panel 40 that the monitoring device 41 has detected an abnormality. This is also provided to the management server 32 through the network N.

<Control unit>
Next, the configuration of the control unit will be described in detail. As shown in FIG. 2, the control unit 7 includes a bidirectional AC / DC converter 51, a solar cell DC / DC converter 52, a charge / discharge circuit 53 for the storage battery 16, and a control circuit 54. .

  The AC / DC converter 51 is connected to the AC distribution board 11 via the AC power line 12 described above, and is connected to the DC distribution board provided in the control unit 7 via the DC power line L1. Connected to P1. The connection terminal P <b> 1 is connected to the DC distribution board 8 through the DC power line 14. The AC power line 12 connecting the AC / DC converter 51 and the AC distribution board 11 is provided with a voltage sensor 55 that detects AC power (more precisely, voltage) supplied from the AC distribution board 11. It has been.

  The DC / DC converter 52 is provided on the DC power line L2 that connects between the connection terminal P2 for the solar cell provided in the control unit 7 and the connection terminal P1 for the DC distribution board 8 described above. .

  The charging / discharging circuit 53 is provided on the DC power line L3 that connects between the connection terminal P3 for the storage battery provided in the control unit 7 and the connection terminal P1 for the DC distribution board described above. In the DC power line L3, a voltage sensor 56 for detecting the voltage (terminal voltage) of the storage battery 16 is provided between the storage battery 16 (more precisely, the connection terminal P3) and the charge / discharge circuit 53. The charge / discharge circuit 53 may be incorporated in the storage battery 16.

  The AC / DC converter 51 has a function of converting AC power into DC power and a function of converting DC power into AC power. That is, the AC / DC converter 51 converts the alternating current power supplied from the AC distribution board 11 into a direct current, and supplies the converted direct current power to the DC distribution board 8 or the storage battery 16. The AC / DC converter 51 is also capable of converting the DC power supplied from the solar cell 3 and the storage battery 16 into AC power and supplying the AC power after the conversion to the AC distribution board 11. . The AC / DC converter 51 switches both the functions described above based on a switching command from the control circuit 54.

  The solar cell DC / DC converter 52 converts the DC power generated by the solar cell 3 into a predetermined DC power, and supplies the converted DC power to the DC distribution board 8 or the storage battery 16.

The storage battery charging / discharging circuit 53 includes a DC / DC converter or the like, and controls charging and discharging of the storage battery 16 based on a command from the control circuit 54.
<Control circuit>
The control circuit 54 includes a timer 61, a remaining capacity detection unit 62, a power failure detection unit 63, a main control unit 64, and a communication control unit 65.

The timer 61 measures the time at that time. For example, when a power failure of the commercial power supply 2 is detected, the timer 61 can also count the elapsed time from that time.
The remaining capacity detection unit 62 detects the remaining capacity (charged state) of the storage battery 16 based on the detection result of the voltage sensor 56. The remaining capacity detection unit 62 estimates the remaining capacity of the storage battery 16 using the fact that a proportional relationship is established between the terminal voltage of the storage battery 16 and the remaining capacity. For example, the remaining capacity detection unit 62 determines that the remaining capacity of the storage battery 16 has decreased when the voltage of the storage battery 16 has decreased. In this example, the remaining capacity detection unit 62 determines the remaining capacity of the storage battery 16 in three stages of low level (Lo), middle level (Middle), and high level (High) according to the terminal voltage of the storage battery 16. To do.

The power failure detection unit 63 detects the presence or absence of a power failure of the commercial power supply 2 based on the detection result of the voltage sensor 55.
The main control unit 64 communicates with the AC / DC converter 51, the DC / DC converter 52, the charge / discharge circuit 53, the DC distribution board 8, and the like through the communication control unit 65. The main control unit 64 controls the AC / DC converter 51, the DC / DC converter 52, and the charge / discharge circuit 53 using the communication. The main control unit 64 controls the operation (on / off) of each DC device 5 through control of the DC distribution board 8 using the communication.

  The main control unit 64 controls the discharge of the solar cell 3 through the DC / DC converter 52 and the charge operation and the discharge operation of the storage battery 16 through the charge / discharge circuit 53. The main control unit 64 converts AC power from the commercial power source 2 into DC power through the control of the AC / DC converter 51, and supplies the converted DC power to the DC distribution board 8. Further, the main control unit 64 converts the DC power generated by the solar cell 3 and the DC power stored in the storage battery 16 into AC power through the control of the DC / DC converter 52 and the charge / discharge circuit 53, and after the conversion. Is supplied to the AC distribution board 11.

  Based on the time information acquired through the timer 61, the detection result of the remaining capacity detection unit 62, or the detection result of the power failure detection unit 63, the main control unit 64 operates (on / off) each DC device 5 through the DC distribution board 8. To control. For example, when a power failure of the commercial power supply 2 is detected, the main control unit 64 supplies the DC power stored in the storage battery 16 to each DC device 5 through the control of the charge / discharge circuit 53. At this time, the main control unit 64 changes the DC power supply destination of the storage battery 16, that is, the DC device 5 to be operated, based on the time information acquired through the timer 61. Specifically, based on the current time information, determine whether the current time is daytime (between sunrise and sunset) or nighttime (between sunset and sunrise the next day). The DC device 5 to be operated is set. Further, at this time, the main control unit 64 sets the DC device 5 to be operated in consideration of the remaining capacity of the storage battery 16.

<Operation priority of DC devices>
Priorities are set for each DC device 5 with respect to power supply in the event of a power failure based on its use or type. As shown in FIG. 3, in this example, three levels of priority are set for each DC device 5. That is, each DC device 5 includes a DC device 5 having the first priority (hereinafter referred to as “first priority device 5a”) and a DC device 5 having the second priority (hereinafter referred to as “second priority device 5b”). And DC device 5 having the third highest priority (hereinafter referred to as “third priority device 5c”). The priority order is not limited to three levels, and may be set as appropriate.

<Table data>
When the power failure of the commercial power source 2 is detected, the main control unit 64 determines the DC device 5 to be supplied with power according to a predetermined priority order based on the table data 67 stored in its storage device 66. decide. That is, as shown in FIG. 4, the power failure of the commercial power source 2 occurs during the daytime or at night, and the remaining capacity (charged state) of the storage battery 16 is low level, middle level, and high level. The following six situations (A) to (F) are assumed depending on which state. The main control unit 64 sets the power supply target according to these situations.

First situation (A): daytime and remaining capacity of storage battery 16 is high level Second situation (B): daytime and remaining capacity of storage battery 16 is middle level Third situation (C) : Daytime and the remaining capacity of the storage battery 16 is low level · Fourth situation (D): Nighttime and the remaining capacity of the storage battery 16 is high level · Fifth situation (E): Nighttime and the remaining capacity of the storage battery 16 Remaining capacity is middle level ・ Sixth situation (F): Nighttime and remaining capacity of storage battery 16 is low level As shown in FIG. A), for example, the first priority device 5a and the second priority device 5b are set as power supply targets, and DC power is supplied to these devices (more precisely, a command signal indicating that) Is output to the DC distribution board 8. The same applies hereinafter.).

When it is determined that the occurrence of the power failure is the first situation (B), the main control unit 64 sets the first priority device 5a as a power supply target and supplies DC power to these devices.
When it is determined that the occurrence of the power failure is the first situation (C), the main control unit 64 sets the first priority device 5a as a power supply target and supplies DC power to these devices.

  When the main control unit 64 determines that the occurrence of the power failure is the first situation (D), the main control unit 64 sets all of the first to third priority devices 5a to 5c as power supply targets, and to these devices. Supply DC power.

  When it is determined that the occurrence of the power failure is the first situation (E), the main control unit 64 sets the first and second priority devices 5a and 5b as power supply targets and supplies DC power to these devices. Supply.

When it is determined that the occurrence of the power failure is the first situation (F), the main control unit 64 sets the first priority device 5a as a power supply target and supplies DC power to these devices.
<Operation of power supply system>
Next, the mode of operation of the power supply system configured as described above will be described.

<Normal (non-power failure)>
First, the operation of the power supply system at the normal time (when no power failure occurs) where power supply from the commercial power source 2 is possible will be described. In this case, priority is given to the operation of the switches 23 and 26 by the user. That is, the control circuit 54 supplies power to the DC device 5 whose operation is requested through the operation of the switches 23 and 26. In this case, the power supply source is as follows.

  That is, the control circuit 54 supplies DC power generated by the solar cell 3 to the DC device 5 when a sufficient amount of power generated by the solar cell 3 can be secured, such as when sufficient solar radiation is obtained in the daytime. On the other hand, when sufficient solar radiation cannot be obtained in the daytime, or when the amount of power generated by the solar cell 3 cannot be secured as in the case of nighttime, the control circuit 54 converts the DC power stored in the storage battery 16 to DC. Supply to device 5. In addition, when the electric power required by the DC equipment 5 side cannot be ensured only by the direct current power from the solar cell 3 or the storage battery 16, the control circuit 54 converts the alternating current power from the commercial power source 2 into direct current power, The converted DC power is supplied to the DC device 5. As a result, the shortage of power required on the DC device 5 side is compensated.

<Emergency (during power failure)>
Next, the operation of the power supply system when the commercial power supply 2 fails will be described with reference to the flowchart of FIG. The flowchart is executed in accordance with the power supply control program for power failure stored in the storage device 66 of the control circuit 54 (more precisely, the main control unit 64).

  Now, when a power failure of the commercial power source 2 is detected based on the detection result of the voltage sensor 55 (step S101), the control circuit 54 performs day / night determination based on the current time information acquired through the timer 61 (step S101). S102). Next, the control circuit 54 detects the remaining capacity of the storage battery 16 based on the voltage (terminal voltage) of the storage battery 16 acquired through the voltage sensor 56 (step S103). The control circuit 54 sets the power supply target according to the priority set for each DC device 5 based on the result of the day / night determination in step S102 and the level of the remaining capacity of the storage battery 16 in step S103 (step S104). Specifically, the control circuit 54 refers to the table data 67 stored in the storage device 66, and the current power failure occurrence status is any of the first to sixth situations (A) to (F). Determine if it is a situation. And the control circuit 54 starts supply of electric power with respect to the electric power supply object set in this step S104 (step S105), and complete | finishes a process. In this case, the solar battery 3 and the storage battery 16 are used as power supply sources.

  As described above, by setting the power supply destination of the storage battery 16 according to the remaining capacity of the storage battery 16 at the time of a power failure of the commercial power supply 2, the power distribution of the storage battery 16 at the time of the power failure can be suitably performed. . For example, according to the remaining capacity of the storage battery 16, the power supply to the DC device 5 having a low priority is cut off, and the power supply to the DC device 5 having a high priority is preferentially performed so that the priority is high. The operable period of the DC device 5 can be ensured. Specifically, in the above-described third situation where the remaining capacity of the storage battery 16 is low in the daytime, power saving is achieved by cutting off the power supply to the lighting equipment, etc., and the supply to the lighting equipment, etc. This makes it possible to supply the amount of power to highly important equipment such as residential fire alarms and communication equipment. Therefore, the minimum required equipment can be used or operated as long as possible.

  The determination of day and night is centrally managed by the control circuit 54 (more precisely, the main control unit 64) based on the current time measured by the timer 61. For this reason, when a power failure occurs, the power supply to each DC device 5 or the interruption thereof is controlled. That is, in the event of a power failure, a configuration is also possible in which each DC device 5 determines whether it is daytime or nighttime, that is, whether it is a time zone for itself to operate, and also controls power supply to itself. Unlike the case where the configuration is adopted, in the system of this example, there is no room for variation in the result of the determination as to whether the operation is possible for each DC device 5.

  In this example, when a power failure is detected even in the daytime, the direct current power from the storage battery 16 is supplied to the DC device 5, but when the amount of power generated by the solar battery 3 can be sufficiently secured, You may make it supply the direct-current power generated with this solar cell 3 to the DC apparatus 5. FIG. In this case, for example, an illuminance sensor (not shown) for detecting illuminance outside the house is provided. And the main control part 64 judges whether solar radiation is enough based on the detection result of an illumination intensity sensor. When it is determined that the solar radiation is sufficient, the main control unit 64 supplies the DC power generated by the solar battery 3 to the DC device 5 assuming that the amount of power generated by the solar battery 3 can be sufficiently secured. If it is determined that the amount of power generated by the solar battery 3 is insufficient, the DC power stored in the storage battery 16 is supplied to the DC device 5 in the same manner as described above.

<Effect of Embodiment>
Therefore, according to the present embodiment, the following effects can be obtained.
(1) The power supply destination of the storage battery 16 is set based on the determination result of whether the time period when the power failure occurs is daytime or nighttime. Thereby, the electric power distribution of the storage battery 16 at the time of a power failure can be performed suitably.

  (2) Further, by setting the power supply destination of the storage battery 16 according to the remaining capacity of the storage battery 16 at the time of a power failure of the commercial power supply 2, the power distribution of the storage battery 16 at the time of the power failure can be more suitably performed. it can. Based on the remaining capacity of the storage battery 16, power can be preferentially distributed to the DC devices 5 that need to be operated.

  (3) The judgment of day and night is centrally managed by the control circuit 54 based on the current time measured by the timer 61. For this reason, when a power failure occurs, the power supply to each DC device 5 or the interruption thereof is controlled.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. This embodiment also basically has the same configuration as the power supply system shown in FIGS. This example is different from the first embodiment in that the remaining capacity of the storage battery 16 is not taken into consideration. That is, the control circuit 54 performs day / night determination based on the current time information acquired through the timer 61, and sets the power supply target based on the result.

  When the power failure of the commercial power supply 2 is detected, the main control unit 64 determines the DC device 5 to be supplied with power according to a predetermined priority order based on the table data 68 stored in its own storage device 66. decide. That is, as shown in FIG. 6, in this example, the situation where a power failure of the commercial power supply 2 occurs is assumed to be either daytime or nighttime. The control circuit 54 sets the first priority device 5a as a power supply target when a power failure occurs in the daytime and the first and second priority devices 5a and 5b when the power failure occurs at nighttime.

  In the operation of the power supply system at the time of a power failure in this example, the processing in step S103 in the flowchart of FIG. 5 is omitted. Further, the processing content of step S104 in the flowchart of FIG. 5 is as described above.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) Day / night judgment is centrally managed by the control circuit 54 based on the current time measured by the timer 61 of the control circuit 54. For this reason, when a power failure occurs, the power supply to each DC device 5 or the interruption thereof is controlled.

  (2) The power supply destination of the storage battery 16 is set based on the determination result of whether the time zone in which the power failure occurs is during the daytime or at nighttime. Thereby, the electric power distribution of the storage battery 16 at the time of a power failure can be performed suitably. For example, by reducing the power supply to lighting equipment, etc. during the daytime, power savings can be achieved, and the amount of power supplied to the lighting equipment, etc. is highly important equipment such as residential fire alarms and communication equipment. It becomes possible to supply to.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. This embodiment also basically has the same configuration as the power supply system shown in FIGS. The present embodiment is different from the first embodiment in that not only the DC device 5 that is operated at the time of a power failure, that is, the power supply destination, but also the operating time of the DC device 5 is set. In this example, five levels of priority are set for each DC device 5. The first to fifth priority DC devices 5 are referred to as first to fifth priority devices 5a, 5b, 5c, 5d, and 5e, as in the first embodiment.

  Now, when a power failure of the commercial power supply 2 is detected, the control circuit 54 supplies power to each DC device 5 (hereinafter referred to as the power supply time calculation table data 69 stored in its storage device 66). , Referred to as “power supply time”). The power supply time for each DC device 5 is calculated based on the priority order set in advance for each DC device 5 and the remaining capacity of the storage battery 16 when a power failure occurs.

  The power supply time for each DC device 5 at the time of a power failure is set as follows, for example. That is, as shown in FIG. 7, the control circuit 54 limits the power supply time to the first priority device 5 a regardless of the remaining capacity of the storage battery 16. Further, the control circuit 54 sets the power supply time to the second priority device 5b to 1 hour when the remaining capacity of the storage battery 16 is at the high level and the middle level, and to 30 minutes when it is at the low level. The control circuit 54 sets the power supply time to the third priority device 5c to 30 minutes when the remaining capacity of the storage battery 16 is at the high level and the middle level, and to 0 minute when it is at the low level. The control circuit 54 sets the power supply time to the fourth priority device 5d to 10 minutes when the remaining capacity of the storage battery 16 is at a high level and to 0 minutes when it is at a middle level and a low level. Finally, the control circuit 54 sets the power supply time to the fifth priority device 5e to 0 minutes regardless of the remaining capacity of the storage battery 16. Note that when the power supply time is set to 0 minutes, the power supply is immediately cut off.

  Next, the power supply process at the time of a power failure will be described with reference to the flowchart of FIG. This flowchart is executed according to the power supply control program for power failure stored in the storage device 66.

  As shown in the flowchart of FIG. 8, when a power failure of the commercial power supply 2 is detected (step S <b> 201), the control circuit 54 determines the remaining battery 16 based on the terminal voltage of the storage battery 16 acquired through the voltage sensor 56. The capacity is detected (step S202). Then, the control circuit 54 calculates power supply time stored in the storage device 66 based on the priority order set in advance for each DC device 5 and the remaining capacity of the storage battery 16 detected in the previous step S202. Referring to the table data 69, the power supply time (power supply time) for each DC device 5 is set (step S203). Next, the control circuit 54 supplies the DC power of the storage battery 16 to each DC device 5 according to the power supply time set in the previous step S203 (step S204). The control circuit 54 starts the timer 61 built in itself simultaneously with the start of the supply of the DC power, and starts measuring the power supply time to each DC device 5 (step S205). When the control circuit 54 detects through the timer 61 that the power supply time set in the previous step S203 has elapsed, the control circuit 54 cuts off the power supply to the DC device 5 for which the elapsed time is set as the power supply time. (Step S206), the process is terminated. Thereafter, each time the power failure of the commercial power source 2 is detected, each process in the flowchart of FIG. 8 is executed.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) When supplying the DC power of the storage battery 16 to the DC device 5 at the time of a power failure, the control circuit 54 stops the supply of power in order from the lowest priority. That is, at the time of a power failure, the control circuit 54 sets the power supply time according to the priority level of each DC device 5. Then, the control circuit 54 determines whether or not the power supply time has elapsed through the timer 61, and interrupts the supply of power to the DC device 5 that is determined that the power supply time has elapsed. For this reason, the supply of electric power is cut off earlier as the DC device 5 has a lower priority. Therefore, the power of the storage battery 16 is saved, and the power supply to the DC device 5 having a higher priority can be continued accordingly. The use time or the operation time of the important DC device 5 having a high priority can be secured.

  (2) The setting of the power supply time at the time of a power failure, the determination of whether or not the power supply time has elapsed, and the start or stop of power supply are all performed collectively by the control circuit 54. For this reason, there is no variation in operating time or on / off timing between DC devices 5 having the same priority. Therefore, the power distribution processing of the power supply system at the time of the occurrence of a power failure is generally controlled.

  Note that this embodiment can also be applied to the first and second embodiments. For example, when this embodiment is applied to the first embodiment, the priority is given to each DC device 5 of the power supply destination set based on the remaining capacity of the storage battery 16 and the judgment result of day and night. Further, the power supply time is set based on the order. Further, when the present embodiment is applied to the second embodiment, the power supply time for each DC device 5 that is a power supply destination set based on the determination result of day and night is further increased based on the priority order. Is set. If it does in this way, the electric power distribution of the storage battery 16 can be more appropriately distributed.

  In the present embodiment, the power supply time at the time of a power failure is set according to the priority of each DC device 5 in consideration of the remaining capacity of the storage battery 16, but the remaining capacity of the storage battery 16 is taken into account. Alternatively, the power supply time to each DC device 5 at the time of a power failure may be set. Even if it does in this way, according to the priority of each DC apparatus 5, the direct-current power of the storage battery 16 can be distributed appropriately.

<Other embodiments>
Each of the above embodiments may be modified as follows.
-In 1st-3rd embodiment, you may be made to perform the said electric power distribution in case there exists electric power supply by the solar cell 3, for example, when a power failure generate | occur | produces in the daytime. That is, in this case, when it is necessary to charge the storage battery 16 and supply power to the DC device 5, the control circuit 54 distributes the power according to the generated power of the solar battery 3. For example, when it is detected that the power generated by the solar cell 3 is sufficient, the DC power generated by the solar cell 3 is preferentially supplied to the DC device 5 and the surplus power is supplied to the storage battery 16. . In this way, the storage battery 16 is charged by the surplus power from the solar cell 3 while enabling the operation of the DC device 5 by the direct-current power from the solar cell 3. That is, both the supply of operating power to the DC device 5 and the charging of the storage battery 16 in preparation for discharging at night can be achieved. Therefore, not only the power distribution of the storage battery 16 but also the power distribution of the solar battery 3 can be suitably performed. In this case, when the DC device 5 that is the power supply destination is a lighting device, the DC power of the solar cell 3 may be preferentially supplied to the storage battery 16. In the daytime, and in the situation where there is solar radiation enough to obtain the power generation amount of the solar cell 3, there is little need to maintain power supply to the lighting device. Since the storage battery 16 can sufficiently store electric power, the electric power can be effectively used at night. In this way, by providing priority to the power distribution destination of the solar cell 3, the power of the solar cell 3 can be appropriately distributed. Moreover, you may make it set the supply destination of the electric power generated by the solar cell 3 based on the time information at the time of a power failure without taking into consideration the electric power generated by the solar cell 3. Even if it does in this way, according to the time slot | zone when the power failure generate | occur | produced, the electric power generated with a solar cell can be distributed appropriately.

  In the first to third embodiments, the day / night determination is performed based on the time information acquired through the timer 61. However, the time information is received through reception of, for example, standard radio waves from the outside using wireless communication or the like. May be obtained. In this case, a radio signal receiving device including time information is provided instead of or in addition to the timer 61.

  -In 1st-3rd embodiment, it may replace with the solar cell 3 which produces electric power using sunlight which is natural energy, and may employ | adopt the electric power generation means using other natural energy other than sunlight. . Moreover, it is also possible to use the said electric power generation means and the solar cell 3 together. Examples of the natural energy power generation means other than the solar battery 3 include a wind power generator that generates power using wind power, or a geothermal power generator that generates power using geothermal heat. Further, a fuel cell may be provided instead of the solar cell 3 or in combination with the solar cell 3.

-Although the case where the power supply system 1 was applied to the detached house was demonstrated in the 1st-3rd embodiment, the application to not only a detached house but a collective house is also possible, for example.
<Other technical ideas>
Next, the technical idea that can be grasped from the above embodiment will be added below.

  In the direct current distribution system according to any one of claims 1 to 3, the direct current distribution system includes a power generation device that generates power using natural energy, and directs the DC power generated by the power generation device to the power storage device and the power storage device. A DC power distribution system that enables supply to a DC device, and the control device sets a supply destination of DC power generated by the power generation device based on time information acquired through the time information acquisition means. According to this structure, according to the time slot | zone when the power failure generate | occur | produced, the electric power generated with a solar cell can be allocated appropriately.

  DESCRIPTION OF SYMBOLS 1 ... Electric power supply system (DC power distribution system), 2 ... Commercial power supply, 16 ... Storage battery (electric storage apparatus), 5 ... DC apparatus (DC apparatus), 54 ... Control circuit (control apparatus).

Claims (5)

When AC power supplied from a commercial power source is converted into DC power and the DC power is supplied to the power storage device and a plurality of DC devices, and when a power failure of the commercial power source is detected, it is stored in the power storage device. In a DC distribution system that supplies DC power to each DC device,
A DC power distribution system comprising a control device that sets a DC device to be supplied with power based on the time when a power failure is detected. The DC power distribution system according to claim 1,
The control device is a DC power distribution system that sets a DC device to be a power supply destination at the time of a power failure in consideration of a remaining capacity of the power storage device. In the DC power distribution system according to claim 1 or claim 2,
For each DC device, set the power supply priority in the event of a power failure in advance,
When a power failure is detected, the control device supplies the power of the power storage device to each DC device after setting the power supply time to each DC device longer for a DC device with a higher priority and power failure. A DC power distribution system that cuts off power supply to a DC device set to the power supply time when it is detected that the power supply time has elapsed with reference to the time when the power supply is detected. The DC power distribution system according to claim 3,
The control device is a DC power distribution system that sets the power supply time according to a remaining capacity of the power storage device. In the DC power distribution system according to any one of claims 1 to 4,
When the power failure is detected, the control device determines day and night based on the time at that time, and sets a DC device to be supplied with power based on the determination result.

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