JP5466911B2 - Power supply system and control device for power supply system - Google Patents

Power supply system and control device for power supply system Download PDF

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JP5466911B2
JP5466911B2 JP2009232014A JP2009232014A JP5466911B2 JP 5466911 B2 JP5466911 B2 JP 5466911B2 JP 2009232014 A JP2009232014 A JP 2009232014A JP 2009232014 A JP2009232014 A JP 2009232014A JP 5466911 B2 JP5466911 B2 JP 5466911B2
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power
storage battery
load
power consumption
charge
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JP2011083084A (en
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秀樹 田村
賢二 中北
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パナソニック株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Description

  The present invention relates to a power supply system and a control device for the power supply system.

  2. Description of the Related Art In recent years, attention has been focused on a power supply system that includes a distributed power source such as a solar cell or a fuel cell, and a distribution path that distributes power by connecting these distributed power source and power system to a load such as a lamp. In addition, such power supply systems include a storage battery (secondary battery) as one of the distributed power supplies so that power can be supplied to the load even during a power failure when power supply from the power system stops. (For example, Patent Document 1).

  In the power supply system of Patent Document 1, a distributed power source including a storage battery includes a charging device for charging the storage battery, a discharging device for sending power discharged from the storage battery to a distribution path, and a charging operation and discharging of the charging device. And a control device for controlling the discharge operation of the device. The control device controls the charging device to charge the storage battery with power supplied from a power system or a distributed power source such as a solar cell or a fuel cell, while controlling the discharging device as necessary to supply power from the storage battery to the load. Was.

JP 2009-159730 A

  By the way, in patent document 1, while securing a certain ratio among the storage capacities of the storage battery as a backup capacity that can be used at the time of a power failure, the remaining capacity obtained by subtracting the backup capacity from the full charge capacity is used for power supply other than at the time of the power failure. Therefore, the effective use of the storage battery was aimed at.

  Here, the ratio of the backup capacity to the full charge capacity is set according to the amount of power required during the power outage, but the amount of power required during the power outage varies greatly depending on the load usage etc. The backup capacity was set to be large so that it could handle various usage situations. However, when the backup capacity is increased, there is a problem that the capacity that can be used is reduced except in an emergency, and the storage battery cannot be used sufficiently.

  This invention is made | formed in view of such a situation, The objective is to provide the electric power supply system which can utilize a storage battery efficiently according to the use condition of load, and the control apparatus of an electric power supply system. is there.

In the following, means for achieving the above object and its effects are described.
The power supply system according to claim 1 includes a storage battery, a power distribution system and a distribution path that connects and distributes the storage battery to a load, a charging / discharging device that charges and discharges the storage battery, and past power consumption in the load. A control device that controls the charge / discharge device to adjust the storage capacity of the storage battery based on the amount, the control device refers to the remaining capacity of the storage battery at a set timing, and from the reference time A threshold value corresponding to the predicted power consumption calculated based on the fluctuation tendency of the power consumption in the load until a certain period of time is set, and the threshold value is compared with the remaining capacity of the storage battery to perform charge / discharge control. And a storage means storing a data table for the past power consumption, a power measurement means for measuring the power consumption of the load, and the data based on the measurement result of the power measurement means. And summarized in that further comprising a correction means for correcting the table.

According to this configuration, since the control device controls the charging / discharging device based on the past power consumption in the load, the storage capacity can be adjusted according to the usage status of the load. Thus, a certain proportion of the storage capacity of the storage battery is ensured according to the use situation, while the remaining charge capacity can be used for arbitrary power feeding. Therefore, the storage battery can be used efficiently according to the load usage state without setting the capacity to be secured excessively.
Further, according to this configuration, the control device refers to the remaining capacity of the storage battery at the set timing, and the predicted power consumption calculated based on the fluctuation tendency of the power consumption amount in the load until a certain period before the reference time. Since a threshold value corresponding to the amount is set and charge / discharge control is performed by comparing the threshold value with the remaining capacity of the storage battery, it is possible to secure a capacity corresponding to the usage tendency of the load.
Further, according to this configuration, since the correction unit that corrects the data table based on the measurement result of the power measurement unit that measures the power consumption amount of the load is provided, the backup capacity corresponding to the change in the load usage state is ensured. be able to.

  3. The power supply system according to claim 2, wherein the control device refers to the remaining capacity of the storage battery at a set timing, and a threshold value set based on a power consumption amount in the load until a predetermined period before the reference time. The gist is to perform charge / discharge control by comparing the remaining capacity of the storage battery.

  According to this configuration, the control device refers to the remaining capacity of the storage battery at the set timing, and determines the threshold set based on the power consumption in the load until a certain period before the reference time and the remaining capacity of the storage battery. Since charge / discharge control is performed in comparison, a capacity according to the recent usage status of the load can be ensured.

  4. The power supply system according to claim 3, wherein the control device performs charge / discharge control by comparing a threshold set based on a power consumption amount in the same period of the previous year in the load with a remaining capacity of the storage battery. And

  According to this configuration, the control device performs charge / discharge control by comparing the threshold value set based on the power consumption amount in the same period of the previous year in the load with the remaining capacity of the storage battery. A corresponding capacity can be secured.

5. The power supply system according to claim 4 , wherein the control device performs charge / discharge control by comparing a threshold set based on power consumption for each time zone in the load with a remaining capacity of the storage battery. And

  According to this configuration, the control device performs charge / discharge control by comparing the threshold value set based on the power consumption for each time zone in the load and the remaining capacity of the storage battery. Capacity according to the situation can be secured.

The control device of the power supply system according to claim 5 is a control of a power supply system comprising a storage battery, a power system and a distribution path for distributing power by connecting the storage battery to a load, and a charge / discharge device for charging and discharging the storage battery. A threshold value corresponding to an expected power consumption calculated based on a fluctuation tendency of power consumption in the load until a predetermined period from the reference time with reference to the remaining capacity of the storage battery at a set timing And comparing the threshold value with the remaining capacity of the storage battery, performing charge / discharge control of the charge / discharge device, measuring the power consumption of the load, and the past power consumption of the load The data table is stored, and the data table is corrected based on the measurement result of the power consumption amount of the load .

According to this configuration, since the control device controls the charge / discharge device based on the past power consumption in the load, the charge capacity can be adjusted in accordance with the load usage state. Thus, a certain proportion of the storage capacity of the storage battery is ensured according to the use situation, while the remaining charge capacity can be used for arbitrary power feeding. Therefore, the storage battery can be used efficiently according to the load usage state without setting the capacity to be secured excessively.
In addition, according to this configuration, the remaining capacity of the storage battery is referred to at a set timing, and corresponds to the predicted power consumption calculated based on the fluctuation tendency of the power consumption in the load until a certain period before the reference time. Since a threshold value is set and charge / discharge control is performed by comparing the threshold value and the remaining capacity of the storage battery, a capacity corresponding to the usage tendency of the load can be ensured.
Further, according to this configuration, since the data table is corrected based on the measurement result obtained by measuring the power consumption amount of the load, it is possible to secure a backup capacity corresponding to a change in the load usage state.

  ADVANTAGE OF THE INVENTION According to this invention, the electric power supply system which can utilize a storage battery efficiently according to the use condition of load can be provided.

Explanatory drawing which shows the structure of an electric power supply system. The block diagram of a control unit. Explanatory drawing of the data table about the power consumption according to a day of the week. The flowchart which concerns on control of charge operation and discharge operation. Explanatory drawing of the data table about the power consumption of every month. The timing chart about the change of the remaining capacity of the storage battery accompanying charging operation and discharge operation.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described with reference to FIGS.
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 commercial AC power source (AC power source) 2 for home use as power, and also supplies the power of the solar cell 3 generated by sunlight to the various devices as a power source. The power supply system 1 supplies power not only to the DC device 5 that operates by inputting a DC power supply (DC power supply) but also to the AC device 6 that operates by inputting an AC power supply (AC 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 1. 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 AC 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 DC 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 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 5, so that both the power and the data are supplied to the DC device through a pair of wires. 5 to transport. 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 are connected to the relay unit 10 via individual DC power lines 25, respectively. 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. In addition, a plurality of switches 26 for manually operating the DC device 5 are connected to the relay unit 10, and the DC power line 25 is turned on and off by the relay by operating the switch 26, thereby enabling the DC unit 5 to operate the DC unit 5. 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, a power meter 29 capable of remotely metering the amount of use of the commercial AC power supply 2 is connected between the commercial AC power supply 2 and the AC distribution board 11. 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 30. 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.

Next, a detailed configuration of the control unit 7 that functions as a control device will be described.
As shown in FIG. 2, the control unit 7 distributes power by connecting the commercial AC power source 2 constituting the power system and the solar cells 3 and the storage batteries 16 constituting the distributed power source to various loads F included in the power supply system 1. A power distribution path 43 is provided. The load F includes system components such as the control unit 7 in addition to various devices such as the DC device 5 and the AC device 6, and the AC power line 12 and the DC power lines 13 to 15 that supply power to these components. , 18, 19, 25, 28, 35 and the DC supply lines 22, 38 constitute a power distribution path 43.

  The control unit 7 includes an AC / DC converter 50 (AC / DC converter) that converts AC power supplied from the commercial AC power source 2 into DC power, and a DC / DC converter 51 connected to the solar cell 3. (DC / DC converter).

  In addition, the control unit 7 includes a discharge device 52 that sends DC power discharged from the storage battery 16 and a charging device 53 that charges the storage battery 16. The storage battery 16, the discharge device 52, and the charging device 53 constitute a distributed power source SB, and the distributed power source SB is provided with a measurement unit (not shown) that measures the remaining capacity of the storage battery 16. Further, the discharge device 52 and the charging device 53 constitute a charging / discharging device.

  In addition, the control unit 7 includes a power measuring device 54 provided in the power distribution path 43 for measuring the power consumption in the load F of the DC device 5 and the like, and a control unit 55 as correction means. The control unit 55 includes a storage unit 56 serving as a rewritable storage unit and a CPU 57 serving as a central processing unit. The storage unit 56 stores a data table T (see FIGS. 3 and 5) regarding the past power consumption in the load F, and secures an area for storing a power measurement result and the like by the power measuring device 54. Has been.

  The control unit 55 of the control unit 7 performs charge / discharge control (at least one of charge control and discharge control) by controlling the operation of at least one of the discharge device 52 and the charging device 53. For example, the storage battery 16 is charged in preparation for a power failure in which power supply from the commercial AC power supply 2 cannot be received, and charging is performed so as to ensure the remaining capacity Wh (see FIG. 6) to be supplied in the event of a power failure. The device 53 and the discharge device 52 are controlled. In the following description, the power capacity secured in the storage battery 16 as an emergency power source in the event of a power failure or the like is referred to as backup capacity Wb (see FIG. 6), and this backup capacity Wb is the capacity at full charge (hereinafter referred to as “full capacity”). The charging capacity is referred to as “charging capacity Wm” (see FIG. 6).

Next, charge / discharge control for securing the backup capacity Wb in the storage battery 16 will be described.
The controller 55 refers to the remaining capacity Wh of the storage battery 16 at the set predetermined timing. Then, when the remaining capacity Wh is less than the backup capacity Wb, the charging device 53 performs a charging operation, and when the remaining capacity Wh exceeds the backup capacity Wb, the discharging device 52 is caused to perform a discharging operation.

  Thereby, it is possible to supply power to the load F by discharging from the storage battery 16 during a power failure. On the other hand, when the power failure has not occurred, the storage battery 16 is effectively utilized by feeding the load F with the DC power charged in the storage battery 16 in a range where the remaining capacity Wh of the storage battery 16 does not fall below the backup capacity Wb.

  Here, the backup capacity Wb of the storage battery 16 is set so as to ensure the amount of power required in the event of a power failure, etc. The amount of power required in the event of a power failure depends on the number of loads F installed and the usage status of the user It is expected to vary greatly depending on Therefore, in this embodiment, the threshold value of the backup capacity Wb is set based on the past power consumption in the load F.

  Hereinafter, as an example of the charge / discharge control based on the past power consumption, a case where the power consumption during the most recent (recent) period of time in the load F is used as the threshold value of the backup capacity Wb will be described. Note that this charge / discharge control refers to the remaining capacity Wh (current remaining capacity) of the storage battery 16 at a predetermined timing in order to adjust the storage capacity of the storage battery 16, and compares the current remaining capacity with a set threshold value. To do. In addition, “the most recent (recent) fixed period” refers to an arbitrary predetermined period from when the remaining capacity Wh of the storage battery 16 is referred to until a predetermined period. For example, if it is the most recent day, the value of the previous day can be used as a threshold value among the power consumption for each day of the week in the data table T1 shown in FIG. Day) can be the period.

  When one week (7 days) is the target period, the values in the data table T1 in FIG. 3 are used not as threshold values but as power consumption by day of the week. Then, the control unit 55 executes the processing flow shown in FIG. 4 at a preset time.

  First, in step S11, the control unit 55 refers to the data table T1. And the control part 55 calculates the average power consumption per day which is an average value for 7 days, and sets it as the threshold value of the backup capacity Wb. Next, in step S12, the control unit 55 calculates the excess / deficiency capacity Ws = Wh−Wb from the current remaining capacity Wh of the storage battery 16 and the backup capacity Wb.

  In step S13, if Ws <0, the determination is Yes and the process proceeds to step S14. If Ws ≧ 0, the determination is No and the process proceeds to step S15. In step S14, the control unit 55 causes the charging device 53 to perform a charging operation. When the charging device 53 performs a charging operation, for example, in the daytime when the weather is good, it is economical to charge the storage battery 16 with a direct current generated by the solar battery 3, and it can be economical at night or rainy weather. For example, the storage battery 16 may be charged with DC power obtained from the commercial AC power supply 2.

  In step S15, the control unit 55 causes the discharge device 52 to perform a discharge operation. In step S15, DC power may be supplied to the load F by discharge control, or active power supply is not performed to maintain the remaining capacity Wh, and only discharge by self-discharge or standby current is performed. Also good.

  In step S16 following step S14 or step S15, the control unit 55 calculates the power consumption amount of the load F in the latest 24 hours. In step S17, the control unit 55 corrects the value in the data table T1 based on the calculated power consumption for the most recent day. That is, the control unit 55 corrects the data table T1 based on the measurement result of the power measuring device 54 that measures the power consumption amount of the load F.

  If actual power consumption data is not yet obtained, such as when the control unit 7 starts to be used, a general value can be stored as an initial value in the data table T1, and subsequent correction can be performed. It can be rewritten to the actual power consumption. When it is desired to perform charge / discharge control based on the latest data, the threshold value may be set by referring to the corrected value after correcting the data table T1.

  With such charge / discharge control, it is possible to ensure a backup capacity Wb according to the user's lifestyle in preparation for a power failure. Further, by correcting the data table T1, the past power consumption as the threshold value of the backup capacity Wb can be updated at any time according to the change in the usage status, so that an appropriate backup capacity Wb can be secured continuously. it can. Further, depending on the type of the storage battery 16, the deterioration may be accelerated if it is held near full charge. However, by setting an appropriate backup capacity Wb, excessive charging can be avoided and the life of the storage battery 16 can be extended. Can do.

  In addition, for example, when an electric cooling / heating device is used as the load F, the power consumption is expected to vary greatly from season to season. Therefore, when the current remaining capacity Wh falls below a threshold set based on the power consumption amount of the load F in the same period of the previous year, the charging device 53 may be caused to perform a charging operation. For example, when using the data of the same month of the previous year as the same period of the previous year, the data table T (T2) for the average daily power consumption per month of the previous year shown in FIG. Keep it. Then, the control unit 55 compares the threshold value with the current remaining capacity Wh and performs charge / discharge control, thereby ensuring an appropriate backup capacity Wb for each month.

  Further, a threshold value may be set based on the power consumption for each time zone in the load F, and charge / discharge control may be performed by comparing the threshold value with the current remaining capacity Wh. In this case, the threshold may be set by calculating the amount of power consumption for each time zone such as morning, noon, night, etc. for each month or every day of the week, or the threshold for each month or day of the week for each time zone. A threshold value may be set by applying a coefficient.

  In addition, the control unit 55 may set a threshold based on the past fluctuation tendency of the power consumption, and perform charge / discharge control by comparing the threshold with the current remaining capacity Wh. For example, the control unit 55 refers to the remaining capacity Wh of the storage battery 16 at the set timing, but the power consumption amount in the load F before a certain period (for example, an arbitrary period such as one week or one month) before the reference time. Analyzing the trend of fluctuations. Then, the control unit 55 calculates an inclination of the power consumption amount as a fluctuation trend to determine an expected power consumption amount at the reference time point, and a value corresponding to the predicted power consumption amount (for example, 50% or 60% of the predicted power consumption amount). %) Is set as a threshold. Alternatively, the maximum value for the most recent fixed period or the same month of the previous year may be set as the threshold value, or the threshold value may be set based on the changing tendency by season or day of the week.

  As shown in FIG. 6, the remaining capacity Wh of the storage battery increases with the charging operation of the charging device 53, and the remaining capacity Wh of the storage battery 16 decreases with the discharging operation of the discharging apparatus 52. Even when power is not supplied to the load F via the discharge device 52, the remaining capacity Wh of the storage battery 16 may decrease with time due to self-discharge or standby current.

  Therefore, the processing flow shown in FIG. 4 is executed at least at the start time ta of the period or time period in which the set threshold value changes, and the start of an arbitrary time segment obtained by subdividing the period or time period in which the common threshold value is set By executing the same processing flow at time tb, the time during which the remaining capacity Wh falls below the backup capacity Wb can be reduced. Note that by setting the threshold value to a value slightly larger than the backup capacity Wb, it is possible to perform control so that the remaining capacity Wh does not fall below the backup capacity Wb.

According to this embodiment described above, the following effects can be obtained.
(1) Since the control unit 7 controls the discharging device 52 and the charging device 53 based on the past power consumption in the load F, the storage capacity can be adjusted according to the usage state of the load F. As a result, a certain percentage of the storage capacity of the storage battery 16 is secured as the backup capacity Wb at the time of power failure according to the use situation, while the remaining charge capacity obtained by subtracting the backup capacity Wb from the full charge capacity Wm It can be used for power supply. Therefore, the storage battery 16 can be used efficiently according to the usage status of the load F without setting the backup capacity Wb excessively.

  (2) The control unit 7 refers to the remaining capacity Wh of the storage battery 16 at the set timing, and the threshold set based on the power consumption amount in the load F from the reference time to a certain period before and the remaining capacity of the storage battery 16 Since charge / discharge control is performed in comparison with Wh, the backup capacity Wb according to the recent usage status of the load F can be secured.

  (3) Since the control unit 7 performs charge / discharge control by comparing the threshold value set based on the power consumption amount of the load F in the same period of the previous year with the remaining capacity Wh of the storage battery 16, the use of the load F according to the period The backup capacity Wb according to the situation can be secured.

  (4) The control unit 7 refers to the remaining capacity Wh of the storage battery 16 at the set timing, and the predicted power consumption calculated based on the fluctuation tendency of the power consumption in the load F from the reference time to a certain period before A threshold value corresponding to is set. And since the set threshold value and the remaining capacity Wh of the storage battery 16 are compared and charge / discharge control is performed, the backup capacity Wb according to the usage tendency of the load F can be ensured.

  (5) Since the control unit 7 performs charge / discharge control by comparing the threshold value set based on the power consumption for each time zone in the load F and the remaining capacity Wh of the storage battery 16, the control unit 7 The backup capacity Wb according to the usage situation can be secured.

  (6) Since the control unit 55 corrects the data table T based on the measurement result of the power measuring device 54 that measures the power consumption amount of the load F, the control unit 55 secures the backup capacity Wb according to the change in the usage state of the load F. be able to.

In addition, the said embodiment can also be changed and implemented as follows.
The charge / discharge control of the present invention is not limited to securing backup capacity in preparation for power use during a power failure. For example, instead of or in addition to the backup capacity Wb, the threshold value of the preliminary charge capacity Wy for full-time power supply (full charge capacity Wm> precharge capacity Wy> backup capacity Wb) is set to the past nighttime. You may set based on the power consumption in. In this case, the storage battery 16 is charged with the electric power generated by the solar battery 3 in the daytime. At this time, only the surplus exceeding the consumption by the load F may be charged.

  In the daytime period, discharge control is permitted as necessary when the full charge capacity Wm ≧ remaining capacity Wh> preliminary charge capacity Wy, but when the precharge capacity Wy ≧ remaining capacity Wh, discharge control is not performed. Charge control is performed or the remaining capacity Wh is maintained. In addition, in order to maintain the remaining capacity Wh, in addition to not performing active discharge control for power supply, when the remaining capacity Wh falls below the precharge capacity Wy due to self-discharge, the shortage is compensated. You may make it charge as much as possible.

  In addition, during the nighttime period, power is supplied from the storage battery 16 to the load F preferentially over the commercial AC power supply 2, but when the backup capacity Wb is set in addition to the preliminary charging capacity Wy, Discharge control is performed so that the remaining capacity Wh does not fall below the backup capacity Wb. In addition, about the setting of the precharge capacity Wy with which nighttime electric power use is prepared, it is good also as 100% of the demand electric energy calculated | required by calculation.

The two or more data tables T such as by time zone, by month or by day of the week may be referred to and the largest power consumption may be adopted as the threshold value for the backup capacity Wb.
-When setting a threshold value for every month, you may employ | adopt the average value of several years, and may set a threshold value from the past monthly fluctuation tendency.

-An arbitrary period such as one day or January can be set for the most recent fixed period.
When adopting the daily power consumption as the threshold, it is assumed that the power for one day is secured, and the threshold may be changed according to the risk of power failure. For example, when it is desired to secure power for two days, the power consumption per two days may be set as a threshold value. When power needs to be secured only in a specific time zone, the power consumption amount in the target time zone. May be used as a threshold value.

  In the processing flow shown in FIG. 4, the corrections in steps S16 and S17 are not necessarily performed every time. For example, if the data used for setting the threshold is based on the amount of power consumed per day and the charge / discharge control in steps S11 to S15 is performed every few hours, the corrections in steps S16 and S17 are performed once a day. You just have to do it. Alternatively, when the average daily power consumption per month is written in the data table T, the correction may be performed once a month.

In the processing flow shown in FIG. 4, the corrections in steps S16 and S17 need not be performed.
The power measuring device 54 is not necessarily provided in the control unit 7. For example, a power measuring device for DC and AC is provided in the middle of the DC supply line 22 and the AC power line 12, respectively, and the control unit 55 measures the measured value. May be counted.

  In the processing flow of FIG. 4, discharging is performed when excess / deficiency capacity Ws ≧ 0 in step S13, but excess / deficiency capacity Ws ≧ charge capacity Wu (full charge capacity Wm ≧ charge capacity Wu> 0). You may make it discharge in case. In this case, the charging capacity Wu that exceeds the backup capacity Wb can be effectively used for power supply when the power is not interrupted. However, since full storage may accelerate the deterioration of the storage battery 16, it is desirable that the full charge capacity Wm> the charge capacity Wu> 0.

  ・ The backup capacity Wb does not necessarily need to be set to 100% of the normal power demand, but 50% or 60% of the normal power demand, etc. It can be set to any capacity corresponding to the amount of power demand.

  The power source for charging the storage battery 16 is not limited to the commercial AC power source 2 and the solar cell 3, and when the power supply system 1 is provided with other distributed power sources such as fuel cells, for example, You may make it charge.

  The power supply system 1 is not limited to a house and can be used in any unit area where the load F is installed, such as an office building, a predetermined residence block, a factory, a park, a sports facility, and a leisure facility.

  DESCRIPTION OF SYMBOLS 1 ... Electric power supply system, 2 ... Commercial alternating current power source which comprises electric power system, 7 ... Control unit as control apparatus, 16 ... Storage battery, 43 ... Distribution path, 52 ... Charging apparatus which comprises charging / discharging apparatus, 53 ... Charging / discharging Charging apparatus constituting the apparatus, 54... Power measuring apparatus as power measuring means, 55... Control section as correcting means, 56... Storage section as storing means, F... Load, T, T1, T2. ... remaining capacity.

Claims (5)

  1. A storage battery,
    A power distribution line for distributing power by connecting a power system and the storage battery to a load; and
    A charging / discharging device for charging / discharging the storage battery;
    A control device for controlling the charge / discharge device to adjust the storage capacity of the storage battery based on the past power consumption in the load ;
    The control device refers to the remaining capacity of the storage battery at a set timing, and a threshold value corresponding to the predicted power consumption calculated based on the fluctuation tendency of the power consumption in the load until a certain period before the reference time And comparing the threshold value with the remaining capacity of the storage battery to perform charge / discharge control,
    Storage means for storing a data table for the past power consumption;
    Power measuring means for measuring the power consumption of the load;
    A power supply system , further comprising: a correction unit that corrects the data table based on a measurement result of the power measurement unit .
  2. The control device refers to the remaining capacity of the storage battery at a set timing, and compares the threshold set based on the power consumption in the load until a certain period before the reference and the remaining capacity of the storage battery. The power supply system according to claim 1, wherein charge / discharge control is performed.
  3. 2. The power according to claim 1, wherein the control device performs charge / discharge control by comparing a threshold set based on a power consumption amount in the same period of the previous year in the load with a remaining capacity of the storage battery. Supply system.
  4. Wherein the controller compares the remaining capacity threshold and the battery which is set based on the time zone of the power consumption in the load, according to claim, characterized in that charging and discharging control 1 to claim 3 The power supply system according to any one of the above.
  5. A control device of a power supply system comprising a storage battery, a power distribution system and a distribution path for distributing power by connecting the storage battery to a load, and a charge / discharge device for charging / discharging the storage battery,
    Refer to the remaining capacity of the storage battery at the set timing, and set a threshold value corresponding to the expected power consumption calculated based on the fluctuation tendency of the power consumption in the load until a certain period before the reference time, Comparing the threshold value and the remaining capacity of the storage battery, performing charge / discharge control of the charge / discharge device,
    The power consumption amount of the load is measured, a data table about the past power consumption amount in the load is stored, and the data table is corrected based on the measurement result of the power consumption amount of the load. A control device for a power supply system.
JP2009232014A 2009-10-05 2009-10-05 Power supply system and control device for power supply system Expired - Fee Related JP5466911B2 (en)

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JP5494633B2 (en) * 2011-12-02 2014-05-21 コニカミノルタ株式会社 Electronic apparatus and image forming apparatus
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