JP2016093069A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system, having distributed power supply facilities of a private power generator, a photovoltaic cell and a storage battery, with reduced cost when charging the storage battery.SOLUTION: The power supply system includes: power supply equipment 2 for supplying power to load equipment 1; and a management device 3. The power supply equipment 2 includes a photovoltaic cell 23 and a storage battery 24. A data collection unit 31 in the management device 3 acquires a power storage amount of the storage battery 24. When the power storage amount is smaller than a predetermined value, a load amount calculation unit 32 calculates a charge amount and also calculates a supply amount from the photovoltaic cell 23 to the storage battery 24. The storage battery 24 is charged by the control of a control unit 34.SELECTED DRAWING: Figure 1

Description

  This invention is an important load by operating a distributed power source in the event of a power failure in an environment such as a building or a water treatment plant having a distributed power source facility for private power generators, solar cells, or storage batteries in addition to a commercial power source. The present invention relates to a power supply system that continuously supplies power, and particularly to a power supply system that can reduce the cost associated with charging a storage battery.

  Conventionally, when a power supply line of a commercial system that supplies power to an important load fails, as a self-sustained operation control system for an important load using storage batteries and solar cells, a generator and a power switch are connected to the power supply line of the commercial system to which a general load is connected. Connect the critical load via the power switch, connect the storage battery via the AC / DC converter to the connection line between the power switch and the critical load, and connect the photovoltaic cell via the power conditioner. By performing voltage detection and determining whether the voltage is equal to or less than a predetermined value, a power switch is turned on under the condition that the voltage has reached the predetermined value, and the control mode of the storage battery is switched to current control, On condition that the voltage has dropped below the predetermined value, the power switch is opened and the control mode of the storage battery is switched to voltage control. It has been shown a technique for switching from interconnected operation to isolated operation of critical load by photovoltaic cells (e.g., see Patent Document 1).

JP 2011-10412 A

  However, charging to the storage battery of the technique disclosed in Patent Document 1 is appropriately charged by a commercial power source, a solar battery, or a generator, and in particular, the generator uses heavy oil or other fuel as a power source. There is a problem in that an extra fuel cost is required to charge the storage battery, resulting in high operating costs.

  The present invention has been made to solve the above-described problems, and provides a power supply system that reduces the extra fuel cost required for private generator operation by charging a storage battery with a solar battery. For the purpose.

  The present invention provides a power supply system including a power supply facility that supplies power to the load facility, and a management device that manages the load facility and the power supply facility. The power supply facility includes a solar battery and a storage battery, The data collection unit provided in the device acquires the storage amount of the storage battery, and when the storage amount of the storage battery is less than a predetermined value, the load calculation unit of the management device calculates the charge amount to the storage battery, and The amount of supply to the storage battery is calculated, and the control unit of the management device controls the solar battery to perform charging so that the storage battery has a charge amount equal to or greater than a predetermined value.

  According to the power supply system according to the present invention, when the storage battery is charged, the battery is charged by the solar battery, so that it is possible to reduce the cost associated with the use of the fuel due to the operation of the private generator as in the past, and the low cost. There is an effect that a power supply system for operation can be provided.

1 is a block diagram showing a power supply system according to a first embodiment. 3 is a flowchart showing power supply to the load facility according to the first embodiment. 3 is a flowchart showing charging of the storage battery according to the first embodiment.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a power supply system 100. In FIG. 1, the power supply system 100 includes a commercial power source 21, a private power generator 22, a solar battery 23, and a storage battery 24 that supply power to an important load facility 1 such as air conditioning and lighting such as a building or a large hospital. Power supply equipment 2 and a management device 3 that manages and controls the power supply equipment 2 and the load equipment 1. Here, the storage battery 24 is provided in order to supplement the power supply stop period before the start-up of the operation of the private generator 22 and the solar battery 23 when power is not supplied from the commercial power source 21, and can be repeatedly charged and discharged. Have The self-generator 22 and the solar battery 23 including the storage battery 24 operate as a distributed power source when power is not supplied from the commercial power source 21 to the load facility 1 for some reason including a power failure, and power supply to the load facility 1 is performed. It is intended to prolong life. The management device 3 collects data on various facilities of the load facility 1 and the power supply facility 2, such as power used, the amount of electricity stored in the storage battery 24, the fuel remaining in the private generator 22, and the operating state of the load facility 1. The data collection unit 31, the load amount calculation unit 32 that calculates the load amount from the collected power used by the load facility 1, and each power source (commercial power source 21, private generator 22, solar battery 23, storage battery 24) for this load amount ), A control unit 34 for controlling the power supply facility 2 in accordance with the supply amount, and a database 35 for managing various data of the respective units.

  Next, the operation of the power supply system 100 will be described with reference to the drawings. FIG. 2 is a flowchart showing a procedure for supplying power to the load facility 1, and FIG. 3 is a flowchart showing a procedure for charging the storage battery 24 of the power supply facility 2. In step 1 of FIG. 2 (hereinafter, step is abbreviated as ST), the data collection unit 31 uses the power used as various data of the load facility 1 and the power supply facility 2, the storage amount of the storage battery 24, and the remaining fuel amount of the private generator 22. Get the operating status of each facility. In ST2, the load amount calculation unit 32 calculates the load amount of the load facility 1 from the amount of power used by the entire load facility 1. In ST3, the operating state of the commercial power source 21 (whether it is receiving power or being out of power) is checked. If the power is being received, the supply amount calculation unit 33 calculates the supply amount of the commercial power source 21 in ST4, and the control unit 34 controls the commercial power source 21 in ST5 to supply power to the load facility 1 in ST6. On the other hand, when the commercial power source 21 is in a power failure at ST3, the supply amount calculation unit 33 calculates the power supply amount to the load facility 1 by the solar battery 23 and the storage battery 24 at ST7, and is OK, that is, in a state where supply is possible. In ST8, the control unit 34 controls the solar battery 23 and the storage battery 24, and power is supplied in ST6. In ST7, when the power supply to the load facility 1 by the solar battery 23 and the storage battery 24 is NO, that is, the power cannot be supplied, the supply amount calculation unit 33 calculates the supply amount by the private generator 22 in ST9, and in ST10 Control unit 34 or private power generator 22 is controlled, and power is supplied in ST6.

  The above shows the operation of the power supply system 100 that supplies power to the power supply facility 2 for the load facility 1 while the commercial power supply 21 is receiving power or during a short-time power failure.

  Next, the operation of the power supply system 100 when the amount of electricity stored in the storage battery 24 is reduced below a predetermined value will be described with reference to FIG. In ST1, the data collection unit 31 acquires the amount of power stored in the storage battery 24. If the amount of stored electricity is equal to or greater than a predetermined value that does not require charging of the storage battery 24, the process returns to ST1. If it is less than the predetermined value, the load amount calculation unit 32 calculates the amount of charge to the storage battery 24 in ST2. In ST3, the amount of power supplied by the solar battery 23 is calculated. When supply is possible (in the case of OK), the control unit 34 controls the solar battery 23 in ST4, and charges the storage battery 24 until the charge amount becomes a predetermined value or more in ST5. On the other hand, when supply is not possible at ST3 (in the case of NO), control is performed by the control unit 34 to charge the storage battery 24 with the low-priced commercial power source 21 at ST6, and charging of the storage battery 24 at ST5 is performed. I do.

  As described above, according to the first embodiment, when the storage amount of the storage battery 24 is less than a predetermined value, that is, when the storage battery 24 cannot supply power, the storage battery 24 is charged with power from the solar battery 23. Therefore, it is possible to perform the low-cost charging instead of the high-cost charging associated with the use of the fuel of the private generator 22 as in the prior art, and the operation cost of the power supply system 100 can be reduced. Even if charging by the solar battery 23 is impossible for some reason, the charging can be performed by the low-price commercial power source 21 at night, so that the cost can be reduced.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

1 Load equipment, 2 Power supply equipment, 3 Management equipment, 21 Commercial power supply, 22 Private generator,
23 solar cells, 24 storage batteries, 31 data collection unit, 32 load amount calculation unit,
33 Supply amount calculation unit, 34 control unit, 100 power supply system.

Claims (1)

In a power supply system including a power supply facility that supplies power to a load facility, and a management device that manages the load facility and the power supply facility, the power supply facility includes a solar battery and a storage battery, and the management The data collection unit provided in the device acquires the amount of electricity stored in the storage battery, and when the amount of electricity stored in the storage battery is less than a predetermined value, the load calculation unit of the management device calculates the amount of charge to the storage battery. In addition, the supply amount of the solar battery to the storage battery is calculated, and the control unit of the management device controls the solar battery to perform charging so that the charge amount of the storage battery is equal to or greater than the predetermined value. Power supply system.

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