JP6269948B2 - Power control system - Google Patents

Description

  Embodiments described herein relate generally to a power control system.

  2. Description of the Related Art A power control system that charges system power to a storage battery and discharges it in a necessary time zone is known.

JP 2002-369406 A

  However, according to Patent Document 1, there is a problem that the power storage is consumed during the discharge time period, and there is no power storage that can be used at the peak time. In that case, it is difficult to lower the contract power because peak power must be secured. Furthermore, if the power storage is discharged only at the peak time, it cannot be effectively used in a time zone other than the peak time.

  The power control system of the present embodiment is capable of controlling the storage battery and the storage battery so as to hold the first remaining power storage amount associated with the first time zone at the start time of the first time zone. A section.

  According to this embodiment, it can be expected that the remaining amount is effectively used while suppressing the peak power.

1 is a system configuration diagram showing an example of a power control system according to a first embodiment. The block diagram of the management part concerning 1st Embodiment Operation unit monitoring screen according to the first embodiment Operation unit setting screen according to the first embodiment Operation unit setting screen according to the first embodiment Example of setting conditions according to the first embodiment Flow showing an operation example of the power control system according to the first embodiment Example of setting conditions according to the second embodiment The flow which shows the operation example of the power control system concerning 2nd Embodiment

The power control system of the embodiment according to the present invention includes a storage battery, a discharge time zone, a first discharge capacity associated with the discharge time zone, a first time zone set in the discharge time zone, A first remaining power storage amount and a second discharge capacity that are associated with the first time zone are set, and the power storage of the storage battery is performed in the discharge time zone before the start time of the first time zone. When the remaining amount reaches the first remaining amount of electricity, when the remaining amount of electricity stored in the storage battery reaches the second discharge capacity during the first time period, and when the remaining time is the first time And a management unit that stops discharging of the storage battery when the remaining storage capacity of the storage battery reaches a first discharge capacity after the band. In addition, the management unit includes the first remaining power storage amount associated with the second time zone and the second time zone set before the start time of the first time zone in the discharge time zone. A second remaining power remaining amount greater than the second power storage amount, and when the remaining power storage amount of the storage battery reaches the second power remaining amount in the discharge time period prior to the start time of the second time period, Stop discharging the storage battery

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

FIG. 1 is a system configuration diagram illustrating an example of a power control system according to the first embodiment. The power control system according to the present embodiment is provided in a facility such as a house, for example, and includes a power storage system 1, a power system 2, and a power distribution system 3.

  The power storage system 1 includes a storage battery 11, a management unit 12, and an operation unit 13. The management unit 12 manages charging of the storage battery 11 based on the power system 2 and discharging from the storage battery 11 to the power distribution system 3. The storage battery 11, the management unit 12, and the operation unit 13 may be physically integrated, or may be a plurality of individuals connected by wire or wirelessly. For example, when the storage battery 11 is installed outdoors, the operation unit 13 may be installed indoors in consideration of user convenience. The contents of the operation input performed by the operation unit 13 are delivered to the management unit 12. The management unit 12 controls the operation of the storage battery 11 based on the contents of the operation input.

  The storage battery 11 stores the power supplied from the power system 2 in accordance with an instruction from the management unit 12 and discharges it in an emergency or in a predetermined pattern.

  The management unit 12 has a configuration as shown in FIG. The communication unit 120 communicates with the storage battery 11 and the operation unit 13 using a wireless or wired communication line. The storage unit 121 stores setting information such as operation conditions, a schedule, and a charge / discharge pattern of the storage battery 11. The measuring unit 122 has a function of measuring the remaining amount of electricity stored in the storage battery 11. The control unit 123 transmits a control command using a predetermined mode to the storage battery 11 using information in the storage unit 121 and the measurement unit 122. The communication unit 120, the storage unit 121, the measurement unit 122, and the control unit 123 may be located in any configuration of the power storage system 1, may be configured integrally with the storage battery 11 or the operation unit 13, or independently. You may do it.

The operation unit 13 has an interface for accepting a user's operation input, and can also display a monitoring screen of the power storage system 1 as shown in FIG. 3, for example. In addition, as shown in FIGS. 4 and 5, a parameter setting screen such as a charge capacity and a discharge capacity can be displayed to accept an operation input. Here, the charge capacity or the discharge capacity can be set from level 1 to the maximum, for example.

The electric power system 2 is a system for an electric power company to supply or purchase electric power to a dwelling unit.

The power distribution system 3 includes a distribution board 31 and at least one load 32. The distribution board 31 may be a separate distribution board that manages the power distribution of the power storage system 1, the power system 2, and the distribution system 3, but is simplified in FIG. 1. The load 32 is a device that requires power consumption, such as a household electric device.

As shown in FIG. 1, the power control system of this embodiment includes a solar power generation system 5 that performs, for example, in-house power generation, and the in-house power generation is performed by the management unit 12 to the power storage system 1, the power system 2, or the power distribution system 3. Electric power may be transmitted. In addition, in order to link the power storage system 1 with HEMS (Home Energy Management System) or external information, a communication function is provided in the operation unit 13 or the management unit 12 so that information can be exchanged with the HGW 4 (Home Gateway). Also good. In this embodiment, the HGW 4 is a communication device that can communicate with the load 32 and the like belonging to the power distribution system 3 via a home wireless or wired network, and can also be connected to a public line.

(First embodiment)
In the power control system shown in FIG. 1 and FIG. 2, the system operation in the case where the amount of power used during peak hours 18: 0 to 21:00 is large and the peak power is suppressed will be described.

  First, the management unit 12 is given setting information as shown in FIG. The charging time zone is set to 00:00:00 to 05:00, and the charging operation is performed until the remaining amount of electricity stored in the storage battery 11 (hereinafter, the remaining amount of electricity stored) reaches “maximum” in this time zone. The discharge time zone is set to 05:00 to 24:00, and in this time zone, the storage battery 11 is discharged as necessary to cover the use of electric power in the house. The discharge capacity is the amount of stored electricity that is desired to remain, and the amount of stored power that is desired to be retained in case of an emergency is set. In this embodiment, “level 1” is set.

  Next, the remaining amount before peak is set to “level 4”. This is electric power that can be used for peak suppression, and is the remaining amount of power that should be kept at least by 18:00, which is the time when the peak time starts. The peak power purchase is set by selecting “medium” from “high”, “medium”, and “low”. The peak power purchase is the maximum power purchased from the power system during peak hours and is a value that falls within the contract power. That is, the contract power can be lowered by reducing the purchased power in the peak time period using the discharge control of the storage battery 11. In this embodiment, the storage battery 11 is controlled so that a value obtained by subtracting a certain amount of power from the contract power is used as the purchased power. The constant power is a low value if the peak purchased power is “high”, and “low”. If so, set a higher value. In this embodiment, when “medium” is set, the discharge of the storage battery 11 is controlled so as to be a value obtained by subtracting 2 kW from the contract power. However, the numerical value for each item is not limited to this, and the set value can be freely changed. May be. For example, the rated output of the storage battery 11 may be selectable.

Furthermore, when the power control system of the present embodiment includes the power generation system 5, the peak-suppressed storage battery discharge force may be controlled according to the output of the power generation system 5.

  FIG. 7 shows an operation flow in a discharge time zone (05: 0 to 24:00) of the system according to the first embodiment.

  The operation flow of FIG. 7 starts when the time exceeds 05:00 (S700).

  First, the system determines whether the time has exceeded 18:00 (S701). That is, if it is before the peak time, the process proceeds to S702, and if it is the peak time period, the process proceeds to S705. At this time, it is determined whether or not the remaining amount of storage is “level 4” or more set as the remaining amount before peak (S702). When the remaining amount reaches “level 4”, the operation is stopped (S703), and the remaining amount of electricity necessary for peak suppression is suspended.

  That is, operations S701 to S704 before the start of the peak time period are performed when the peak time starts (when 18:00 is exceeded (S701)) or when the remaining power storage amount reaches the “pre-peak remaining amount” (S702). ) And the process proceeds to S705.

  Next, the system determines whether the time has exceeded 21:00 (S705). If it is a peak time zone, the system proceeds to S706, and if it has exceeded 21:00, the system proceeds to S709. In S706, it is determined whether or not the remaining amount of electricity stored is “level 1” or more set in the discharge capacity. The discharge is controlled to suppress the peak (S708). When the remaining amount reaches “level 1” in the determination of S706, the operation is stopped (S707). That is, since the set value of the discharge capacity that is to be retained at least in the event of an emergency is “level 1”, the operation is continued until the remaining amount of power storage reaches “level 1” (S707).

  That is, operations S705 to S708 in the peak time period are ended when the peak time period ends (when 21:00 is exceeded (S705)) or when the remaining power storage reaches the “discharge capacity” (S706). Then, the process proceeds to S709.

  Next, the system determines whether the time is in the discharge time zone (S709). If the discharge time zone is over, the system ends the flow. If not, the remaining power storage amount is set as the discharge capacity. The value “level 1” is used up (S710).

That is, the operations S709 to S712 after the end of the peak time period are finished when the discharge time is over (when it exceeds 24:00 (S709)).

(Effects of the first embodiment)

According to the first embodiment, it is possible to hold power storage for suppressing power purchase during a time zone where power consumption is at a peak, and to effectively use power storage even during non-peak hours. Can do.

(Second Embodiment)
In the second embodiment, a system will be described in which peak suppression is to be performed in two peak time zones when power consumption is high in the early morning and evening.

  First, the management unit 12 is given setting information as shown in FIG. The charging time zone is set to 00:00:00 to 05:00, and the charging operation is performed until the remaining amount of electricity stored in the storage battery 11 (hereinafter, the remaining amount of electricity stored) reaches “maximum” in this time zone. The discharge time zone is set to 05:00 to 24:00, and in this time zone, the storage battery 11 is discharged as necessary to cover the use of electric power in the house. Note that the discharge capacity is the amount of electricity to be stored, and the amount of electricity to be held in preparation for an emergency is set. In this embodiment, “level 1” is set.

  Next, the remaining amount before the morning peak (first peak) from 05:00 to 08:00 is “level 5”, and the remaining amount before the evening peak (second peak) from 17:00 to 20:00 is “level”. 4 ”. This is electric power that can be used for peak suppression in each peak time zone, and is the remaining amount of electricity that should be kept at a minimum before each peak time starts. In this embodiment, since the start time of the morning peak time zone is the same as the start time of the discharge time zone, it is possible to use the charge for the charge capacity charged the previous night, and the effect of the setting is not exerted. When the morning peak time is set to start at 09:00, if the storage battery is used more than expected between 5:00 and 09:00, the peak may not be suppressed at the first peak time. For this reason, if the remaining amount before peak 1 is set as level 5, it can be used from 05 to 00 to 09:00 between the maximum remaining amount of power storage and level 5.

The peak power purchase is set by selecting “medium” from “high”, “medium”, and “low”. If you want to reduce the maximum power purchased from the power system, that is, contract power, set a smaller value. Furthermore, when the power control system of the present embodiment includes the power generation system 5, the peak-suppressed storage battery discharge force may be controlled according to the output of the power generation system 5.

  FIG. 9 shows an operation flow in a discharge time zone (05: 0 to 24:00) of the system according to the second embodiment.

  The operation flow of FIG. 9 starts when the time exceeds 05:00 (S900).

  First, the system determines whether the time has exceeded 08:00 (S901). That is, if the peak time is in the morning, the process proceeds to S902. If the peak time is in the morning, the process proceeds to S905. At this time, it is determined whether or not the remaining power storage amount is “level 4” or more set as the remaining amount before peak (S902). . At this time, peak suppression is performed by controlling the discharge of the storage battery so that the purchased power becomes a value obtained by subtracting 2 kW from the contract power (S904). When the remaining amount reaches “level 4”, the operation is stopped (S903), and the remaining amount of electricity necessary for evening peak suppression is put on hold.

  That is, operations S901 to S904 in the morning peak time zone are performed when the morning peak time ends (when it exceeds 08:00 (S901)) or the remaining power storage amount reaches the next “pre-peak remaining amount”. (S902), and the process proceeds to S905.

  Next, the system determines whether or not the time is the next peak time zone (S905), and performs a discharge operation to hold the remaining amount of electricity necessary for evening peak suppression (S906 to S908).

  That is, the system operations S905 to S908 performed during the peak time period are as follows: when the next peak time period starts (when it exceeds 17:00 (S905)), When the “remaining amount” is reached (S906), the process ends, and the process proceeds to S909.

Since the operations from S909 to S916 are the same as the operations from S705 to S712 in the first embodiment, a description thereof will be omitted.

(Effect of 2nd Embodiment)

According to the second embodiment, even when there are two or more peak hours of power use, it is possible to hold power storage for suppressing required power purchases and to store power even in non-peak hours. Can be used effectively.

DESCRIPTION OF SYMBOLS 1 ... Power storage system 11 ... Storage battery 12 ... Management part 13 ... Operation part 2 ... Electric power system

Claims (2)

A storage battery,
Discharge time zone, first discharge capacity associated with the discharge time zone, first time zone set in the discharge time zone, first power storage associated with the first time zone When the remaining amount and the second discharge capacity are set, and the remaining storage amount of the storage battery reaches the first remaining storage amount in the discharge time period before the start time of the first time period, When the remaining amount of electricity stored in the storage battery reaches the second discharge capacity in the first time zone, and after the first time zone, the remaining amount of electricity stored in the storage battery becomes the first discharge capacity after the first time zone. A management unit that stops the discharge of the storage battery when it reaches
Equipped with a,
The management unit
A second time period that is set before the start time of the first time period in the discharge time period and that is greater than the first remaining power storage amount associated with the second time period. Is further set, and the storage battery is discharged when the remaining storage capacity of the storage battery reaches the second remaining storage capacity in the discharge time period prior to the start time of the second time period. A power control system characterized by being stopped . The management unit
Wherein such power purchase becomes a predetermined power less than the first time period and said second time period, the power control system according to claim 1, characterized in that to control the discharge of the storage battery.

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