JP2011130649A - Electric power supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To level an electric power demand which is supplied to a zone from a commercial power supply, without the accompaniment of complicated computations regarding borrowing and lending of electric power, by distributing power from the commercial power supply to each dwelling unit of a housing complex. <P>SOLUTION: A distribution board 2 has a zone wattmeter M1, which measures the power amount in a housing complex B, and distributes power to each dwelling unit H of the housing complex B. Power is also supplied to the distribution board 2 from a common power supply 1 equipped with a storage battery SC. If the power amount measured by the zone wattmeter M1 does not reach a designated value, power is supplied to the dwelling unit H, through a commercial power supply supplied from a power system Pn; and during the period, an armor storage battery SC is charged by the commercial power supply. Moreover, when the power amount measured by the zone wattmeter M1 reaches the designated value, power is supplied to at least one dwelling unit H from the common power supply 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power supply system that distributes power from a commercial power source to a plurality of individual areas included in a prescribed zone.

  2. Description of the Related Art Conventionally, a technique has been proposed in which a group of a plurality of power consumers is formed, and power supply and demand between the consumers is coordinated and adjusted within the group. In Patent Document 1, in distributing power supplied from an electric power company, a power supply control device is provided between the entire consumers constituting the group and an electric power system to which the electric power company supplies power. A technology is disclosed in which a power supply control device adjusts the power supply / demand balance by monitoring the amount of power demand at a consumer. The technology described in Patent Document 1 is that at least a part of consumers in a group is provided with a distributed power source such as a micro gas turbine power generation device, a solar power generation device, a wind power generation device, and a fuel cell. This is an assumed technology.

JP 2002-10499 A

  By the way, in the technique described in Patent Document 1, it is necessary to determine a schedule for the power purchase amount in order to collectively adjust power supply and demand in the power supply control device. For this reason, in the power supply control device, it is necessary to perform a complicated calculation for accumulating a history of the power supply and demand at each consumer and predicting the power demand.

  The present invention has been made in view of the above-mentioned reasons, and its purpose is to distribute power from a commercial power source to a plurality of individual areas included in a specified zone, and from a commercial power source without complicated calculations. An object of the present invention is to provide a power supply system that enables leveling of power demand supplied to a zone.

  To achieve the above object, the present invention provides a distribution board that distributes power to a plurality of individual areas included in a specified zone, a zone power meter that measures the amount of power used in the zone, A common power supply having a storage battery for storing power from a commercial power supply, and a control device for controlling the storage to the storage battery and the discharge from the storage battery according to the amount of power used measured by the zone power meter. The panel selects the power to be supplied to the individual area according to an instruction from the control device from one of the commercial power source and the common power source, and the control device at least when the power consumption measured by the zone power meter reaches a specified value The distribution board is instructed to supply power from a common power source to one individual area.

  In addition, the distribution board is inserted into each of the first electric circuits that supply power to the individual areas from the commercial power source, a plurality of second electric circuits that supply power from the common power source to the individual areas, and the first electric circuit, respectively. A first switch whose opening and closing is controlled by the control device, and a second switch which is inserted in each second electric circuit and whose opening and closing is controlled by the control device. Until the measured power consumption reaches the specified value, all the first switches are closed and all the second switches are opened, and the remaining capacity of the storage battery reaches the upper limit of the appropriate range. When the amount of electric power stored and measured by the zone power meter reaches a specified value, the first switch corresponding to at least one individual area is opened and the second switch corresponding to the individual area is closed. And It is desirable to supply power from the common power supply to the individual by area.

  Furthermore, an individual wattmeter that measures the amount of power used in each individual area is provided, and the control device uses the amount of power measured by the individual wattmeter when the amount of power measured by the zone wattmeter reaches a specified value. The individual area is selected from the one with the larger number, the first switch corresponding to the selected individual area is opened, and the second switch corresponding to the individual area is closed, and then measured by the zone power meter. It is desirable to keep the power consumption in the zone below the specified value.

  The shared power source has a power generation device that generates power using natural energy, a function of storing power from the power generation device in a storage battery, and a charge / discharge circuit that discharges the power of the storage battery. The control device closes the second switch and stores power in the storage battery if there is surplus power while supplying power to each individual area from the power generation device, and discharges from the storage battery if there is a shortage. Thus, a configuration instructing the charge / discharge circuit can be employed.

  When a plurality of stages are set for the unit price of the electricity charge when purchasing power from the commercial power supply, it is desirable that the control device controls the storage and discharge of the storage battery for each unit price of the electricity charge.

  It is desirable for the control device to store the amount of power corresponding to the loss associated with charging / discharging of the storage battery in addition to the amount of power discharged from the storage battery during storage of the storage battery.

  According to the configuration of the present invention, a common power source including a storage battery for distributing power to a plurality of individual areas in a zone defined by a distribution board and storing power from a commercial power source is provided and measured by a zone power meter. When the power consumption of a designated zone reaches the specified value, the power supply from the shared power supply is adopted for at least one individual area. In addition, it is possible to level the power demand supplied from the commercial power source to the zone without complicated calculation of the amount of electricity only by controlling the charging / discharging of the storage battery.

It is a block diagram which shows embodiment. It is operation | movement explanatory drawing same as the above.

  In this embodiment, as shown in FIG. 1, an apartment house B having a plurality of dwelling units H as individual areas of a user is illustrated as a zone, but each office and tenant occupies each other like an office building or a tenant building. A building having a plurality of individual areas and having an independent electric power meter in each individual area can be set as a zone, or a detached house can be set as an individual area and a region such as a town can be set as a zone.

  It is also possible to treat one house as a zone and a place where a load of each system branched by a distribution board exists as an individual area. In this case, it is also possible to detect the energizing current for each branch system using a Rogowski coil or the like and measure the power consumption for each system from the energizing current.

  The apartment house B is provided with a shared power source 1 including a storage battery SC arranged in an electrical room or the like, and the shared power source 1 is shared in the apartment house B. Moreover, in the example of illustration, the common power supply 1 contains the solar power generation device PV installed in the roof etc. of the apartment house B. FIG.

  Therefore, the common power source 1 is provided with a power storage circuit 11 that charges the storage battery SC with a commercial power source supplied from the power system Pn. Therefore, the charging circuit 11 has a function of performing AC-DC conversion. The shared power source 1 charges the storage battery SC with the surplus power generated by the solar power generation device PV, and uses a charge / discharge circuit for combining the power of the storage battery SC with the output power of the solar power generation device PV. 12 is also provided. Furthermore, the shared power source 1 also includes a power conditioner 13 that converts the power of the solar power generation device PV and the storage battery SC into AC power. In addition, it can replace with the solar power generation device PV, and can also provide the power generation device using natural energy other than sunlight.

  The power system Pn of the commercial power source is connected to the distribution board 2 arranged in the manager room of the apartment house B or the like. The distribution board 2 distributes the power supplied from the power system Pn and the shared power supply 1 to each dwelling unit H. The distribution board 2 includes a main breaker (not shown) and a plurality of branch breakers 21, and further performs system interconnection between the common power supply 1 and the commercial power supply power system Pn. Each branch breaker 21 provided in the distribution board 2 is connected to a branch line Lb for distributing power to each dwelling unit H, and power is supplied to each dwelling unit H through the branch line Lb.

  Each dwelling unit H is provided with an individual wattmeter M2, and a load L is connected via the individual wattmeter M2. Actually, a distribution board (not shown) for the dwelling unit is arranged between the individual power meter M2 and the load L, and the branch line Lb from the distribution board 2 is divided into a plurality of systems by the distribution board for the dwelling unit. Branch off.

  The distribution board 2 includes a zone power meter M1 that collectively measures the amount of power used in the apartment house B. The zone power meter M1 has a bidirectional power measurement function that measures both the amount of power supplied from the power grid Pn to the distribution board 2 and the amount of power back-flowed from the distribution board 2 to the power grid Pn. Have. That is, the zone power meter M1 causes the power grid Pn to flow backward as a surplus of the amount of power purchased from the power grid Pn as a commercial power source and the power generated by the solar power generation device PV provided in the apartment house B. Measure the amount of power.

  In the present invention, since the solar power generation device PV is not essential, the case where the solar power generation device PV is not provided will be described first, and then the case where the solar power generation device PV is added will be described. That is, the charging / discharging circuit 12 first focuses only on the function of discharging from the storage battery SC, and the power conditioner 13 focuses on only the function of converting the power of the storage battery SC into alternating current.

  In the distribution board 2, after measuring the electric energy received from the electric power grid | system Pn with the zone wattmeter M1, it is made to branch to the some electric circuit Lp1 which supplies electric power to each dwelling unit H. An electric circuit Lp3 from the zone wattmeter M1 to the power storage circuit 11 is also provided. In each electric circuit Lp1, a switch SW1 whose opening / closing is controlled by receiving an opening / closing signal from the control device 10 is inserted.

  In addition, a plurality of electric circuits Lp2 for supplying power from the power conditioner 13 to each dwelling unit H are provided inside the distribution board 2, and each electric circuit Lp2 is opened and closed in response to an opening / closing signal from the control device 10, respectively. A switch SW2 for controlling is inserted.

  The electric circuit Lp1 that supplies electric power from the power system Pn to each dwelling unit H and the electric circuit Lp2 that supplies electric power from the shared power supply 1 to each dwelling unit H are connected in common to the same dwelling unit H. Moreover, each branch breaker 21 is inserted between the connection point of the electric circuits Lp1 and Lp2 and the dwelling unit H, respectively. Therefore, one ends of the switch SW1, the switch SW2, and the branch breaker 21 are connected to each other.

  The control device 10 for controlling the opening / closing of each switch SW1, SW2 is based on the power consumption measured by the zone power meter M1 and the power consumption at each dwelling unit H measured by the individual power meter M2. The switching of the switches SW1 and SW2 is controlled. The control device 10 also controls the operation of the power storage circuit 11, the charge / discharge circuit 12, and the power conditioner 13.

  Therefore, the control apparatus 10 communicates between the distribution board 2 and each dwelling unit H. That is, the control device 10 acquires the power consumption measured by the zone power meter M1 through communication with the distribution board 2 and controls the opening / closing of the switches SW1 and SW2, and the individual power meter M2 through communication with the dwelling unit H. Get the power consumption by.

  In addition, the control device 10 communicates with the power storage circuit 11, the charge / discharge circuit 12, and the power conditioner 13. That is, the control apparatus 10 controls charging / discharging of the storage battery SC by communicating with the electrical storage circuit 11, the charging / discharging circuit 12, and the power conditioner 13.

  Since the control device 10, the common power source 1 and the distribution board 2 are installed in a relatively close place, a communication line Ls dedicated for communication is used for communication between the control device 10, the common power source 1 and the distribution board 2. Use. Moreover, since each dwelling unit H is arrange | positioned comparatively far with respect to the control apparatus 10, between the control apparatus 10 and each dwelling unit H, it uses the technique of the power line carrier communication which shares the branch line Lb for a communication path. Communicate. In addition, when the local communication network used for communication, such as an interphone, is constructed, it is also possible to use the local communication network for communication between the control device 10 and each dwelling unit H.

  Next, charging / discharging control of the switches SW1 and SW2 and the storage battery SC by the control device 10 will be described. The control device 10 uses the used power amount acquired from the zone wattmeter M1 and the used power amount acquired from the individual wattmeter M2 in controlling the opening / closing of the switches SW1 and SW2. These power consumptions are acquired by the control device 10 for each unit period (for example, an appropriate period such as 5 minutes, 10 minutes, or 30 minutes).

  Generally, the unit price of the electricity charge for commercial power is set based on the maximum value of demand power in one month, with the average value of the amount of power used every 30 minutes as demand power, and electricity based on the contract power. The unit price is set. Therefore, in the apartment house B, it is desirable to suppress the maximum value of the demand power measured by the zone power meter M1 and the individual power meter M2.

  Therefore, the control device 10 calculates the demand power by acquiring the power consumption measured by the zone power meter M1 (if the power consumption every 30 minutes is acquired, the power consumption is calculated as the power demand. The switching of the switches SW1 and SW2 is controlled so that the demand power does not exceed a specified value (an appropriate power value set lower than the contract power). That is, when the power consumption measured by the zone power meter M1 reaches the specified value, the power consumption purchased from the commercial power supply is increased by supplying power from the shared power supply 1 to at least some of the dwelling units H. Suppress.

  Therefore, the control device 10 closes all the switches SW1 so that power is supplied from the commercial power source to all the dwelling units H until the power consumption measured by the zone power meter M1 reaches the specified value. (ON). Moreover, in order to stop the electric power supply from the common power supply 1 to the dwelling unit H, all the switches SW2 are opened (off). Here, the storage circuit 11 stores the storage battery SC from the commercial power supply until the remaining capacity of the storage battery SC reaches the upper limit of the appropriate range, and stops storing when the remaining capacity falls within the appropriate range. During the period in which the switch SW1 is closed, power is supplied from the commercial power supply to each dwelling unit H through the electric circuit Lp1. In at least a part of this period, power is stored from the commercial power supply to the storage battery SC through the power storage circuit 11.

  On the other hand, when the power consumption measured by the zone power meter M1 reaches a specified value, it is considered that the demand power may exceed the contract power, and the switch SW1 corresponding to at least one dwelling unit H is opened for commercial use. Power supply from the power source to the dwelling unit H is cut off. At this time, by closing the switch SW2 corresponding to the dwelling unit H, the charging / discharging circuit 12 and the power conditioner 13 are operated to supply power from the shared power supply 1 to the dwelling unit H, and the storage battery SC is charged. In order to stop the operation, the storage circuit 11 is stopped.

  Here, the dwelling units H that supply power from the shared power source 1 can be all the dwelling units H of the apartment house B, but the power capacity of the storage battery SC is limited. Therefore, in order to reduce the discharge from the storage battery SC as much as possible while keeping the amount of power used in the apartment B from exceeding a specified value, the power consumption measured by the individual power meter M2 is increased in order from the largest. By selecting the dwelling unit H, the power consumption measured by the zone power meter M1 is maintained below a specified value.

  The dwelling unit H that satisfies this condition is selected by the following procedure. First, the used electric energy measured by the individual wattmeter M2 is arranged in descending order, and an addition value obtained by adding them in order from the top of the used electric energy is obtained. That is, the added value of the used electric energy from the first place and the second place, the added value of the used electric energy from the first place to the third place, the added value of the used electric energy from the first place to the fourth place, and so on. The addition value is obtained in order. Of these addition values, an addition value that results in a subtraction result equal to or less than the specified value when subtracted from the total power consumption of each dwelling unit M measured by the individual power meter M2 is obtained. Select dwelling unit H.

  By supplying power from the common power source 1 to the selected dwelling unit H without supplying power from the commercial power source, the demand power is suppressed below the contracted power in the entire apartment house B. . Moreover, each dwelling unit M is supplied with required power from either the commercial power source or the shared power source 1. That is, it is possible to prevent the demand power from exceeding the contract power while satisfying the power demand.

  On the other hand, when the amount of power used measured by the zone power meter M1 is less than or equal to the specified value, no power is supplied from the common power source 1 to any dwelling unit H, and power is supplied only from commercial power sources to all dwelling units H Supply. Further, during at least a part of this period, the storage battery SC of the shared power source 1 is charged using the power of the commercial power source.

  Therefore, the electric power supplied from the common power source 1 to the dwelling unit H is stored in the storage battery SC during a period in which no electric power is supplied from the common power source 1 to the dwelling unit H. The remaining capacity of the storage battery SC is monitored by the control device 10 provided in the shared power supply 1, and the control device 10 controls charging / discharging so that the remaining capacity accompanying charging / discharging of the storage battery SC is maintained in an appropriate range. Is going.

  Table 1 shows a summary of the control by the control device 10. In Table 1, operation | movement is divided into the case where the demand power of the whole apartment house B is higher than a regulation value, and the case where it is low.

すなわち、需要電力が低い場合には、各住戸Ｈには商用電源から電力が供給され、この間の少なくとも一部期間において蓄電池ＳＣが充電される。また、需要電力が高い場合には、住戸Ｈのうち上述のようにして選択された需要電力の高い住戸Ｈには蓄電池ＳＣから電力が供給され、需要電力の低い住戸Ｈには商用電源から電力が供給されることになる。

That is, when the demand power is low, power is supplied to each dwelling unit H from a commercial power source, and the storage battery SC is charged in at least a part of the period. In addition, when the demand power is high, power is supplied from the storage battery SC to the high demand power of the dwelling units H selected as described above, and from the commercial power source to the low demand power dwelling unit H. Will be supplied.

  Here, the total power demand of the apartment house B includes the amount of power used in the common part of the apartment house (including the shared power supply 1) in addition to the amount of power used in each dwelling unit H. The total amount of power used measured by the total M2 does not correspond to demand power. Moreover, since the power of the shared power source 1 is used together so that the demand power does not exceed the contract power, the power consumption measured by the zone power meter M1 corresponds to the purchased power from the commercial power source. Does not necessarily correspond.

  However, the control device 10 can control the switching of the switches SW1 and SW2, and the operation control of the power storage circuit 11, the charging / discharging circuit 12, and the power conditioner 13 if the change in demand power in the apartment house B is known. In this embodiment, the amount of power used measured by the zone power meter M1 is used as a guideline for demand power.

  By the way, even if the demand power falls below the specified value, the demand power does not immediately shift to the low demand power state (the switch SW1 is in the on state), but the demand power drops to the return value set lower than the prescribed value. When it does, it shifts to the state where demand power is low. That is, by giving hysteresis to the operation of the switches SW1 and SW2, hunting of the switches SW1 and SW2 is prevented.

  As described above, even if the demand power of the apartment house B increases because the power can be supplied from the shared power source 1 including the storage battery SC to at least one dwelling unit H, the purchased power from the commercial power source increases. As a result, the purchased power can be prevented from exceeding the contract power.

  On the other hand, the electric power supplied from the storage battery SC to the dwelling unit M during the period when the purchase of electric power from the commercial power source is suppressed is purchased from the commercial power source and charged to the storage battery SC during the period when the demand power of the apartment house B is reduced. Become. That is, since the power consumed in the dwelling unit M is purchased from the commercial power supply, the dwelling unit H that has received power supply from the shared power supply 1 has purchased the power from the commercial power supply. In other words, the dwelling unit H that uses the power stored in the storage battery SC will later return to the storage battery SC the amount of power that matches the amount of power used.

  Therefore, in the individual power meter M2 provided in each dwelling unit H, the amount of power used is integrated regardless of whether or not the power supply from the shared power source 1 is received, and an electric charge corresponding to the amount of power used is charged. Become. However, when the power supply is received from the commercial power source, the power purchased by the apartment house B from the commercial power source does not exceed the contract power when the power supply is received through the path through the storage battery SC. As a result, the increase in the electricity bill is suppressed.

  In short, when the demand power in the apartment house B increases, the power purchased from the commercial power supply is reduced by supplying power to the dwelling unit H using the shared power source 1 in combination, and the demand power in the apartment house B decreases. The electric power purchased from the commercial power source is increased by charging the storage battery SC of the shared power source 1. With this operation, the power purchased from the commercial power source is leveled.

  FIG. 2A shows the relationship between the actual demand power in the apartment house B (solid line) and the purchased power from the commercial power source (broken line) by using the storage battery SC. The amount of power indicated by the broken line corresponds to the amount of power used measured by the zone power meter M1, and can be regarded as demand power if the power of the storage battery SC is not used.

  Here, in a state where the power of the storage battery SC is not used, when the demand power (that is, the power corresponding to the amount of power used measured by the zone power meter M1) exceeds the specified value Th1, as shown in FIG. Then, the storage battery SC starts discharging, and the purchased power indicated by the broken line decreases. In this way, it is possible to prevent the power purchased from the power system Pn from reaching the contract power.

  Thereafter, when the demand power falls below the return value Th2, the discharge of the storage battery SC stops and the purchased power indicated by the broken line increases. Here, in order to obtain the demand power, it is necessary to obtain the power consumption measured by the individual power meter M2, and therefore the power consumption measured by the zone power meter M1 is substituted for the demand power.

  As shown in FIG. 2 (c), the storage battery SC is discharged when the demand power exceeds the specified value Th1 (the charge / discharge circuit 12 operates), and then stops discharging when the demand power falls below the return value Th2 ( The charge / discharge circuit 12 is stopped), and the battery is charged until the remaining capacity falls within an appropriate range by operating the power storage circuit 11 after the discharge is stopped.

  By the way, when the dwelling unit H receives power supply from the common power source 1 and when charging the common power source 1 from the commercial power source, power loss occurs. Therefore, when the storage battery SC is charged, the power storage circuit 11 is operated so as to charge with the amount of power added by the amount of loss compared to the amount of power supplied to the dwelling unit H. That is, when power storage is performed so that the remaining capacity of the storage battery SC falls within an appropriate range, the amount of power used measured by the zone wattmeter M1 becomes the amount of power including the loss.

  However, there is a common space (entrance lobby and hallway) shared by residents of the dwelling unit H in the housing complex, and the electricity consumed by facilities such as lighting equipment placed in the common space will be covered by common expenses, etc. The electricity charges for the loss due to the provision of the power supply 1 may also be paid by common service costs. Alternatively, when storing power from the solar power generation device PV to the storage battery SC, the above-described loss may be covered by the generated power of the solar power generation device PV.

  The above-described operation focuses on the leveling of the power purchased from the commercial power source. However, by using the storage battery SC, the power is used in the time zone for purchasing the power from the commercial power source and each dwelling unit H. It is also possible to shift the time zone. Therefore, when the unit price of the electricity rate changes according to the time zone, the storage battery SC is charged during the time zone where the unit price of the electricity rate is low, and discharged from the storage battery SC during the time zone where the unit price of the electricity rate is low. Also good.

  In this case, since the electricity bill cannot be calculated if the power consumption is uniformly measured by the individual wattmeter M2, a storage battery SC is provided that stores electricity in different time zones where the unit price of the electricity bill is different, and the power of the storage battery SC is supplied to each dwelling unit H. In doing so, it is necessary to notify the individual power meter M2 which time zone the power is supplied from the storage battery SC.

  However, if the power of the storage battery SC is preferentially supplied to the dwelling unit H where the demand power is high, an unfairness occurs in the electricity rate in the apartment house B. Therefore, when the time zone in which the power of the storage battery SC is used is different from the time zone in which the storage battery SC is stored, it is desirable to distribute the power from the storage battery SC to each dwelling unit H all at once.

  In addition, when the storage battery SC is provided for each time zone, if the time zone in which the storage battery SC is stored and the time zone in which the storage battery SC is discharged coincide with each other, it is purchased from a commercial power source without complicated control. Electric power leveling can be performed. In addition, instead of providing the storage battery SC for each time zone, it is possible to obtain the charge / discharge power amount of the storage battery SC and calculate the lease of the power amount for each time zone, but the management of the power amount becomes complicated. .

  In the above-described configuration, the operation not considering the solar power generation device PV has been described. However, when the solar power generation device PV is used, power is supplied from the solar power generation device PV to each dwelling unit H, and surplus power is generated. Sometimes, the surplus power of the photovoltaic power generator PV is stored in the storage battery SC through the charge / discharge circuit 12.

  During the period when electric power is supplied from the solar power generation device PV to each dwelling unit H, the power conditioner 13 can perform grid connection with the power system Pn of the commercial power source. While power is supplied to the dwelling unit H, the grid connection is not normally performed, and the measurement of the power consumption by the individual power meter M2 is also stopped.

  Of course, in order to be conscious of energy saving, it is desirable to measure the total amount of power used in each dwelling unit H, but the power purchased from a commercial power source that generates electricity charges and the photovoltaic power generator PV that is basically free of charge It is necessary to distinguish it from the power generated in Therefore, if necessary, the individual power meter M2 is provided with one that measures the total amount of power used in the dwelling unit H and one that measures only the power purchased from the commercial power source.

  Here, as described above, when the surplus power generated by the photovoltaic power generation device PV is stored in the storage battery SC, the storage battery SC is stored with the power stored in the storage battery SC with the power of the commercial power source and the generated power of the solar power generation device PV. It must be distinguished from the power stored in the SC. Therefore, a means for measuring the amount of power supplied to the storage battery SC in the storage circuit 11 is provided, and the amount of power stored by the power of the commercial power source is grasped, or as the storage battery SC, the power of the commercial power source is stored, It distinguishes and provides what accumulates the electric power of solar power generation device PV.

  If the storage battery SC is divided so that the power of the commercial power supply and the power of the photovoltaic power generator PV are stored separately, the origin of the power used for storage can be clearly distinguished for each storage battery SC. . That is, when the grid connection between the output of the power conditioner 13 and the power system Pn is performed, the storage battery SC that stores only the power generated by the solar power generation device PV can be used as a power source. The inconvenience of reverse power flow to the commercial power supply using the electric power stored in can be avoided.

  In the above-described example, when the demand power of the apartment house B exceeds a specified value, the power of the storage battery SC is supplied to the dwelling unit H where the amount of power used is high. Therefore, when the resident who gives priority to comfort and the energy-saving resident exist in the apartment house B, the electric power of the storage battery SC may be supplied only to the dwelling unit H of the resident who gives priority to comfort. In order to avoid such a situation, for each dwelling unit H, a standard power amount is defined for each dwelling unit H based on the actual power consumption, and when the demand power of the apartment house B exceeds the specified value, You may make it supply the electric power of the storage battery SC in an order from the dwelling unit H with the big value which subtracted the reference | standard electric energy from the electric energy used.

DESCRIPTION OF SYMBOLS 1 Common power supply 2 Distribution board 10 Control apparatus 11 Power storage circuit 12 Charging / discharging circuit 13 Power conditioner B Apartment house (zone)
H dwelling unit (individual area)
Lp1 (first) electric circuit Lp2 (second) electric circuit M1 zone power meter M2 individual power meter Pn power system PV solar power generation device (power generation device)
SC storage battery SW1 (first) switch SW2 (second) switch

Claims (6)

  A distribution board that distributes power to a plurality of individual areas included in a specified zone, a zone power meter that measures the amount of power used in the zone, and a storage battery that is shared in the zone and stores at least power from a commercial power source A common power supply and a control device that controls the storage of electricity in the storage battery and the discharge from the storage battery according to the amount of power used measured by the zone power meter, and the distribution board is placed in an individual area according to an instruction from the control device The power to be supplied is selected from one of a commercial power supply and a shared power supply, and the control device supplies power from the shared power supply to at least one individual area when the power consumption measured by the zone power meter reaches a specified value. A power supply system that instructs a distribution board to supply power.   The distribution board includes a plurality of first electric circuits that supply electric power to the individual areas from a commercial power source, a plurality of second electric circuits that supply electric power to the individual areas from the shared power source, and a first electric circuit. A first switch that is inserted and controlled to be opened and closed by the control device; and a second switch that is inserted into each second electric circuit and controlled to be opened and closed by the control device. Until the power consumption measured by the zone power meter reaches a specified value, all the first switches are closed and all the second switches are opened, and the remaining capacity of the storage battery is appropriate. The battery is charged until the upper limit of the range is reached, and when the power consumption measured by the zone power meter reaches a specified value, the first switch corresponding to at least one individual area is opened and the individual area is supported. The second switch is closed the and power supply system of claim 1, wherein the supplying the power from the common power supply to the individual area, that.   An individual power meter that measures the amount of power used in each of the individual areas is provided, and the control device uses the power that is measured by the individual power meter when the amount of power used that is measured by the zone power meter reaches a specified value. The zone power is selected by selecting an individual area from a larger amount, opening the first switch corresponding to the selected individual area, and closing the second switch corresponding to the individual area. The power supply system according to claim 2, wherein the amount of power used in the zone measured by the meter is maintained below a specified value.   The shared power source has a power generation device that generates power using natural energy, a function of storing power from the power generation device in the storage battery, and a charge / discharge circuit that discharges the power of the storage battery, and a commercial power source in the distribution board The control device closes the second switch and stores power in the storage battery if there is surplus power while supplying power from the power generation device to each individual area. 4. The power supply system according to claim 2, wherein the charge / discharge circuit is instructed to discharge from the storage battery.   When a plurality of stages are set for the unit price of electricity charges when purchasing power from the commercial power source, the control device controls storage and discharge of the storage battery for each unit price of electricity charges. The power supply system according to any one of claims 1 to 4.   The said control apparatus stores the electric energy for the loss accompanying charging / discharging of a storage battery in addition to the electric energy discharged from the storage battery at the time of the electrical storage of the said storage battery. The power supply system according to item.

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