JP2013017268A - Power management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power management system capable of obtaining information on commercial power supply with a simple system structure.SOLUTION: A reading meter 14 measures the commercial power supplied to each consumer and transmits the measured result to a communication network including the Internet NT1. A management server CS transmits a piece of power supply information on time-variation of the commercial power available for the consumer to the reading meter 14 via the communication network. A power management device 12 starts charging a rechargeable batty 15 and controls the recharging par unit time based on the power supply information received by the reading meter 14 so that the charged power in the rechargeable battery 15 reaches a predetermined target value by recharge termination time.

Description

  The present invention relates to a power management system that manages the amount of electricity stored in a consumer.

  When there is a possibility that the supply amount of commercial power exceeds the demand amount, the power company that is the power supply source notifies in advance to each consumer within the supply range that the supply amount of commercial power will be reduced, It is possible to enlighten the reduction of power consumption by each consumer.

  At this time, in each consumer unit such as an apartment house, a detached house, a factory, an office, etc., if the power is sufficiently accumulated before the power supply reduction period, It can meet the power demand. However, if sufficient power cannot be stored before the period for reducing the amount of power supply, life, work, production, etc. will be hindered.

  Therefore, in a power supply system in which a power storage device is installed, it has been proposed to increase the power supply capability of the power storage device and supply power from the power storage device to the load device when the supply of commercial power stops (for example, Patent Document 1). Specifically, when the commercial power supply stop information is input, the target state quantity (for example, SOC (State Of Charge) target quantity) of the power storage device is improved and the charging power is increased.

JP 2008-187800 A

  In Patent Document 1, there is no description about the acquisition path of commercial power supply stop information, and it is necessary to newly provide a network for acquiring commercial power supply stop information.

  However, in recent years, a variety of networks have already been connected to consumers, and a new network is provided in order to obtain power supply information for commercial power sources from the viewpoint of simplifying system construction at the customers. That is not desirable.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide a power management system capable of acquiring power supply information of a commercial power supply while simplifying system construction.

  The power management system of the present invention measures the commercial power supplied to each of the consumers, and sends the measurement result to the network, and the power supply related to the time fluctuation of the commercial power that can be supplied to the consumer A management server that transmits information to the meter-reading meter via the network, a storage battery that stores electric power, and the storage battery that is charged using the commercial power supplied to the consumer, and the stored power of the storage battery is discharged A power management device, and a device that operates using at least one of commercial power and stored power of the storage battery, the power management device based on the power supply information received by the meter-reading meter The stored power of the storage battery reaches a predetermined level at a charge stop timing at which commercial power that can be used to charge the storage battery is reduced below a predetermined amount. As has reached the value, starts charging of the storage battery, and controlling the charge amount per unit time.

  In this invention, it is preferable that the said power management apparatus makes the charge amount per said unit time small, so that the period from the charge start of the said storage battery to the said charge stop timing is long.

  In the present invention, the power management device charges the storage battery using surplus power that is not used by the device among the commercial power supplied to the consumer, and the stored power of the storage battery is predetermined at the charging stop timing. When it is determined that the target value is not reached, it is preferable to reduce the number of the devices that can operate using commercial power to increase the amount of charge per unit time.

  In this invention, it is preferable that the power management apparatus controls the amount of stored power discharged based on the operation pattern of the device after the charging stop timing.

  As described above, the present invention has an effect that the power supply information of the commercial power supply can be acquired while simplifying the system construction.

It is a block diagram which shows the structure of the power management system of Embodiment 1. It is a block diagram which shows the structure of the power management system of Embodiment 2.

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

(Embodiment 1)
The power management system of the present embodiment is used in each consumer who is supplied with electric power from an electric power company. As shown in FIG. 1, a distribution board 11, a power management device 12, a device 13, and a meter-reading meter 14. The storage battery 15 is provided as a main configuration.

  The distribution board 11 is connected to an AC 100 / 200V main line Wa1 drawn into a consumer such as a dwelling unit, a detached house, a factory, an office, etc. of a collective housing, and is connected to a commercial from an electric power company through the main line Wa1. The power supply is connected. In the distribution board 11, a branch portion 111 composed of a plurality of branch breakers is accommodated. The trunk line electric circuit Wa1 branches to a plurality of branch electric lines Wa2 laid in the house via the branch part 111. Each branch electric circuit Wa <b> 2 is connected to a device 13 such as a lighting device, an air conditioner, or a personal computer (PC), and supplies operating power to these devices 13. The commercial power source is distributed from the substations provided in various places to the pole transformer Tr provided in the utility pole D near the customer, and after being stepped down by the pole transformer Tr, it is distributed to each consumer. The In addition, as a form of a consumer, other than each dwelling unit of a housing complex, a detached house, a factory, and an office may be sufficient.

  Next, the power management apparatus 12 includes an inverter unit 121, a charge / discharge unit 122, and a device control unit 123.

  This system includes a storage battery 15 configured by a lithium ion battery or the like, and the storage battery 15 is connected to the charge / discharge unit 122.

  The inverter unit 121 converts the DC output of the storage battery 15 input via the charging / discharging unit 122 into an AC voltage, and the AC output of the inverter unit 121 is sent to the distribution board 11 via the AC circuit Wa3 installed in the house. Supplied. Note that the inverter unit 121 has a function of coordinating the AC output with a commercial power source supplied via the main line Wa1.

  The charging / discharging unit 122 performs charging / discharging control of the storage battery 15. Specifically, the charging / discharging unit 122 receives commercial power supplied from a commercial power source via the main line Wa1, and converts the commercial power into DC power. Conversion is performed to charge the storage battery 15. Furthermore, the charging / discharging unit 122 supplies the DC power of the storage battery 15 to the inverter unit 121, thereby discharging the stored power of the storage battery 15 and supplying AC power to the device 13.

  The device control unit 123 is communicably connected to the device 13 via the communication line L1 and executes preset schedule control, energy saving control, scene control, and the like on the device 13 in a normal time. . The device 13 operates using commercial power supplied from a commercial power source and power supplied from the inverter unit 121 of the power management device 12 (power stored in the storage battery 15). Note that the device control unit 123 may communicate with the device 13 using a radio signal.

  In general (when there is no request for a power peak cut described later), the AC output operation of the inverter unit 121 and the charge / discharge operation of the charge / discharge unit 122 are performed based on the storage amount of the storage battery 15, the time, and the like. The device 13 is supplied with the stored power of the storage battery 15 or a commercial power source, or a combination of the stored power of the storage battery 15 and the commercial power source. The power management apparatus 12 has a wireless communication function, and performs wireless communication, which will be described later, with the distribution board 11, meter reading meter 14, and the like.

  Next, the meter-reading meter 14 is provided on the main line Wa1, and measures the amount of commercial power used by consumers, and transmits a measurement result (meter-reading data) using wireless communication, power line carrier communication, or the like. It comprises. Meter reading data transmitted from the meter-reading meter is received by, for example, the master unit X installed on the utility pole D near the house, and the master unit X uses an optical fiber or the like to the management server CS of the power company connected to the Internet NT1. Transmit meter reading data. A communication network including the Internet NT1 corresponds to the network of the present invention.

  Moreover, the main | base station X transmits the various signals transmitted from the management server CS of the electric power company to the meter-reading meter 14 via a communication network including the Internet NT1, and the meter-reading meter 14 transmits the received signal to the wireless in the consumer. It also has a function of wireless transmission to the terminal.

  Depending on the increase in power demand, the power generation status of the power company, etc., there is a possibility that a power failure may occur due to a shortage of power supply in which the demand amount of the commercial power source exceeds the power generation amount in the power company distribution range. In this case, the power company requests each customer in the distribution range to cut the power peak to refrain from using the commercial power source and suppress the peak of the power demand.

  In this embodiment, when a power peak cut is requested, power supply information is transmitted from the management server CS of the power company to each customer in the distribution range via a communication network including the Internet NT1, and the meter reading meter of each customer 14 receives power supply information. The power supply information is information related to the time fluctuation of commercial power that can be supplied from the commercial power supply via the trunk line Wa1, and in this embodiment, the commercial power that can be supplied from * month * day * hour to * hour * % Reduction ”. The meter-reading meter 14 transfers this power supply information to the power management apparatus 12 by a radio signal.

  Here, the communication network between the meter-reading meter 14 and the management server CS is a remote meter-reading network that transmits meter-reading data of the meter-reading meter 14. Therefore, since the power supply information is transmitted to each consumer using this remote meter reading network, the consumer does not need to provide a separate network for acquiring power supply information. That is, the power management system can acquire the power supply information of the commercial power supply while simplifying the system construction.

  The charging / discharging unit 122 of the power management apparatus 12 recognizes the start time of the power peak cut based on the received power supply information, and sets the start time of the power peak cut as the charge stop timing. This charging stop timing is a time when the commercial power that can be supplied to the consumer falls below the power used by the device 13 and the surplus power becomes zero. After the charging stop timing, the storage battery 15 cannot be charged. . That is, the charging stop timing is a timing at which the supply amount of commercial power is reduced and the commercial power that can be used for charging the storage battery 15 falls below a predetermined amount (in this case, zero).

  Then, the charging / discharging unit 122 seems to have reached a predetermined target value (for example, 80%) of the SOC (State Of Charge) of the storage battery 15 at the charging stop timing (power peak cut start time). In addition, the storage battery 15 is rapidly charged.

  That is, the start time of the quick charge and the charge amount per unit time for charging the storage battery 15 during the quick charge are determined so that the SOC of the storage battery 15 has reached a predetermined target value determined in advance at the charge stop timing. Is done. Specifically, the start time of the quick charge is set to the time after receiving the power supply information (for example, the reception time +10 minutes), and the charge amount per unit time is set to the start time of the quick charge and the charge stop timing. To be determined. The amount of charge per unit time becomes smaller as the period from the quick charge start time to the charge stop timing is longer. Therefore, when the period from the start time of the quick charge to the charge stop timing is long, the AC power that can be supplied to the device 13 is increased even during the quick charge, and the operable devices 13 can be increased.

  As described above, the power management device 12 starts the rapid charging based on the power supply information so that the SOC of the storage battery 15 reaches the predetermined target value at the charging stop timing, and determines the charging amount per unit time. Control.

  The charging / discharging unit 122 discharges the stored electric power of the storage battery 15 by supplying the DC output of the storage battery 15 to the inverter unit 121 after the charging stop timing. Then, after the charging stop timing, the combination of the stored power of the storage battery 15 and the commercial power supply is supplied to the device 13, and the operating power of the device 13 can be ensured while performing the peak cut.

  Then, since the SOC of the storage battery 15 has reached a predetermined target value (for example, 80%) determined in advance at the charging stop timing (power peak cut start time), even during the power peak cut period, to the device 13. Can be ensured.

  Further, the charging / discharging unit 122 may control the discharge amount of the stored power based on the operation pattern of each device 13 after the charging stop timing. For example, a device 13 that guarantees the operation during the peak cut period is selected in advance from all the devices 13, and the device control unit 123 waits for a device 13 other than the device 13 for which the operation is guaranteed during the peak cut period. Control to the state. The charging / discharging unit 122 can efficiently consume the stored power of the storage battery 15 by controlling the discharge amount based on the operation pattern of the device 13 whose operation is guaranteed, and the usable period of the stored power can be extended. can do. The operation-guaranteed device 13 is a device that protects the lifeline, is a television, a network device, a minimum lighting device, and the like, and includes a meter-reading meter 14 that can perform network communication with the outside.

  Moreover, the charging / discharging part 122 is charging the storage battery 15 using the surplus electric power which the apparatus 13 does not use among the commercial electric power supplied to the consumer. When the charging / discharging unit 122 determines that the SOC of the storage battery 15 does not reach the predetermined target value at the charging stop timing even when the current surplus power is used to maximize the charging amount per unit time, The control unit 123 controls a part or all of the devices 13 to a standby state. That is, by reducing the number of operable devices 13, the amount of commercial power used by the devices 13 is reduced and surplus power is increased. Therefore, the charging / discharging unit 122 ensures power for quick charging and The amount of charge per hour can be set higher. In this case, since the SOC of the storage battery 15 can be brought closer to the predetermined target value, the amount of power stored in the storage battery 15 at the charge stop timing can be increased, and the supply power during the peak cut period can be further secured.

(Embodiment 2)
As shown in FIG. 2, the power management system of the present embodiment is provided with a solar cell 16 and a power conditioner 17 in each consumer, and the same reference numerals are given to the same configurations as those of the first embodiment. A description thereof will be omitted.

  In the present system, a solar battery 16 and a power conditioner 17 constitute a solar power generation device, and DC power generated by the solar battery 16 by sunlight is supplied to the power conditioner 17, and the power conditioner 17. Is converted into AC power.

  The alternating current output of the power conditioner 17 is supplied to the alternating current circuit Wa3. Normally (when there is no request for power peak cut), the surplus of the AC output from the power conditioner 17 that has not been consumed by the device 13 is reversely flowed (sold) to the commercial power supply via the trunk line Wa1. Note that the power conditioner 17 has a grid-connected operation function for coordinating AC output with commercial power supplied from commercial power.

  Then, when there is a request for power peak cut from the power company, the surplus that is not consumed by the device 13 in the AC output of the power conditioner 17 is used for quick charging of the storage battery 15. Therefore, since the power generated by the solar power generator can be used together with the commercial power for rapid charging of the storage battery 15, the amount of power stored in the storage battery 15 can be more reliably ensured.

  Moreover, since the electric power generated by the photovoltaic power generator can be used together with the stored electric power of the storage battery 15 at the time of power peak cut, the power that can be used at the time of power peak cut increases.

DESCRIPTION OF SYMBOLS 11 Distribution board 12 Power management apparatus 121 Inverter part 122 Charging / discharging part 123 Equipment control part 13 Equipment 14 Meter-reading meter 15 Storage battery CS management server

Claims (4)

A meter-reading meter that measures the commercial power supplied to each of the consumers and sends the measurement results to the network;
A management server that transmits power supply information about time fluctuation of commercial power that can be supplied to the consumer to the meter-reading meter via the network;
A storage battery for storing electric power;
A power management device that charges the storage battery using commercial power supplied to the consumer and discharges the stored power of the storage battery;
A device that operates using at least one of commercial power and stored power of the storage battery,
Based on the power supply information received by the meter-reading meter, the power management device reduces the supply amount of commercial power and can be used for charging the storage battery at a charge stop timing when the commercial power falls below a predetermined amount. A power management system, wherein charging of the storage battery is started and the amount of charge per unit time is controlled so that the stored power of the storage battery has reached a predetermined target value.   2. The power management system according to claim 1, wherein the power management device reduces the amount of charge per unit time as the period from the start of charging of the storage battery to the charge stop timing is longer.   The power management device charges the storage battery using surplus power that is not used by the device among the commercial power supplied to the consumer, and the stored power of the storage battery is set to a predetermined target value at the charging stop timing. 3. The power management system according to claim 1, wherein, when it is determined that the power does not reach, the number of the devices operable using commercial power is reduced to increase the amount of charge per unit time. 4.   The power management system according to any one of claims 1 to 3, wherein the power management device controls a discharge amount of stored power based on an operation pattern of the device after the charging stop timing.

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