JP2003299251A - Distributed power storage system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a distributed power storage system capable of appropriately operating a plurality of power storage apparatuses, thus completely discharging necessary power as necessary and improving economy and energy saving by reducing the overall power consumed. <P>SOLUTION: The power storage apparatuses 2a, 2b, 2c, 2d are connected to a server 5 through LAN 4, and the storage and discharge of power in the respective power storage apparatuses are integrally controlled. On a building 11 side as well, the power storage apparatuses 12a, 12b, 12c, 12d are connected to the server 5 through a LAN 14, a personal computer 15, and the Internet 20. The storage and discharge of power in the respective power storage apparatus are integrally controlled by the server 5. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed power storage system that stores electric power and discharges the stored electric power as needed.

[0002]

2. Description of the Related Art There is known a power storage device which stores low-priced nighttime electric power and discharges the stored electric power, for example, during the daytime when the electric power is frequently used. There is also a power storage device that also has the function of continuously supplying power to the load without interruption during a power failure. In such a power storage device, for example, a sealed lead acid battery is used as a means for storing power. In practice, a plurality of the sealed lead-acid batteries are connected in series and used.

[0003]

In the case of a building that uses a large amount of electric power, it is conceivable to install a plurality of electric power storage devices in the building in order to secure sufficient electric power that corresponds to the amount of electric power used. However, in this case, if each power storage device is operated in a disjointed manner, there is a concern that the power storage device cannot be effectively used, such as that required power cannot be obtained when needed.

The present invention takes the above circumstances into consideration,
The purpose is to be able to properly operate a plurality of power storage devices, to reliably discharge the necessary power when needed, and to reduce the overall power consumption, which is economical and economical. An object of the present invention is to provide a distributed power storage system that can improve energy efficiency.

[0005]

According to a first aspect of the present invention, there is provided a distributed power storage system, wherein a plurality of power storage devices store electric power and discharge the stored electric power as needed, and each of the electric power storage devices. A control unit for managing the storage and release of
Is equipped with.

According to a second aspect of the present invention, there is provided a distributed power storage system according to the first aspect, further comprising a network line for data transmission, which is connected between each of the power storage devices and the control section. Is equipped with.

In the distributed power storage system of the invention according to claim 3, in the invention according to claim 1, the control unit is limited. The control unit has operation control means for setting the storage timing of each power storage device to the nighttime power time zone and time-sharing the daytime time zone and assigning the discharge timing of each power storage device to each time zone. There is.

In the distributed power storage system of the invention according to claim 4, in the invention according to claim 1, the control unit is limited. The control unit sets the storage timing of each power storage device to the nighttime power time zone, time-divides the daytime time zone, and allocates the discharge timing of each power storage device to each time zone; It has a monitoring unit that monitors the state of the device, a detection unit that detects the power usage of the load for each power storage device, and a calculation unit that calculates the power usage charge according to the detection result of this detection unit. There is.

In the distributed power storage system of the invention according to claim 5, in the invention according to claim 1, each power storage device is limited. Each power storage device is installed at multiple locations in the building.

In the distributed power storage system of the invention according to claim 6, in the invention according to claim 1, each power storage device is limited. Each power storage device is installed in each of a plurality of locations in a plurality of buildings.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, power storage devices 2a, 2a,
2b, 2c and 2d are installed respectively. These electric power storage devices take in electric power from the commercial AC power supply 3, store it, and release the stored electric power as needed.
As shown in FIG. 2, a rectification unit 31 for converting the voltage of the commercial AC power supply 3 into a DC voltage, an inverter unit 32 connected to the output end of the rectification unit 31, and an AC connection connected to the output end of the inverter unit 32. Bypass circuit 3 for bypassing the voltage of switch unit 33 and commercial AC power supply 3 to rectifying unit 31 and inverter unit 32 and supplying the result to AC switch unit 33.
4, a storage battery module 36 connected to the output end of the rectifying unit 31 via an open / close switch 35, a charger 37 that converts the voltage of the commercial AC power supply 3 into a DC voltage and outputs the DC voltage for charging the storage battery module 36, and A management unit 30 is provided.

The management unit 30 includes the power storage device 2
The state of each part of a (the individual voltage and temperature of the sealed lead storage battery B) and the amount of power supplied from the power storage device 2a to the load are detected through various sensors, and the rectification unit 31, the inverter unit 32, The AC switch unit 33, the open / close switch 35, and the charger 37 are controlled.

The inverter section 32 converts the output voltage of the rectifying section 31 or the voltage of the storage battery module 36 into an AC voltage having a predetermined frequency by switching. The AC switch unit 33 selects either the output voltage of the inverter unit 32 or the voltage of the bypass circuit 34 and outputs it to the outside.
This external output is supplied to the load (not shown) on each floor. The open / close switch 35 is turned on when the storage battery module 36 needs to be discharged, and is turned off except for each. The storage battery module 36 is configured by connecting a plurality of storage batteries, for example, a sealed lead storage battery B in series, and is charged by the output voltage (DC voltage) of the charger 37. When it is necessary to supply power to the load, the voltage of the commercial AC power supply 3 changes
Is converted into a DC voltage by the DC voltage, and the DC voltage is converted into a DC voltage.
2 is supplied. The DC voltage supplied to the inverter unit 32 is converted into an AC voltage having a predetermined frequency, that is, high-reliability and high-quality AC power, and is externally output through the AC switch unit 33. In this case, the open / close switch 35 is off. The storage battery module 36 is charged by operating the charger 37 while the open / close switch 35 remains off.

The commercial AC power supply 3 has a power failure (including an instantaneous power failure)
In that case, the output voltage of the rectifying unit 31 becomes zero. When the output voltage of the rectification unit 31 becomes zero, the open / close switch 35 is turned on to discharge the storage battery module 36, and the discharge voltage (DC voltage) is supplied to the inverter unit 32. The discharge voltage supplied to the inverter unit 32 is converted into an AC voltage having a predetermined frequency, that is, high-reliability and high-quality AC power, and is externally output through the AC switch unit 33. With this external output, regardless of the power failure of the commercial AC power supply 3,
The operation of the load can be continued.

When a failure occurs in the rectifying unit 31 or the inverter unit 32, the AC switch 34 is switched, and the voltage of the commercial AC power source 3 is directly output to the outside through the bypass circuit 35 without interruption.

Such uninterruptible power supplies 2a, 2b, 2
A network line for data transmission, for example, a LAN (local area network) 4 is laid on each floor where c and 2d are installed. The management unit 30 of each uninterruptible power supply is connected to the LAN 4.

A server 5 is further installed in the building 1,
The LAN 4 is also connected to the server 5.

On the other hand, power storage devices 12a, 12b, 12c and 12d are also installed on each floor of another building 11. These power storage devices are power storage devices 2a, 2
b, 2c, 2d, which have exactly the same configuration, and are provided on each floor where data transmission network lines such as LAN (local area network) 1 are installed.
4 is connected.

A personal computer 15 is further installed as a communication terminal in the building 11, and the personal computer 15 is also connected to the LAN 14.

The server 5 is connected to the personal computer 15 via a communication line such as the Internet 20.
Access to. By this access, the LAN 4 on the building 1 side and the LAN 14 on the building 11 side are connected to each other via the server 5 and the personal computer 15.

The server 5 is a control unit for comprehensively managing the storage and release of electric power of all the electric power storage devices in the buildings 1 and 11 via the LAN 4, the Internet 20, the personal computer 15 and the LAN 14, and the respective electric powers. Operation control means for setting the storage timing of the storage device to the nighttime power time zone and time-sharing the daytime time zone and assigning the discharge timing of each power storage device to each time zone,
Monitoring means for monitoring the state of each power storage device through the management unit 30, detection means for detecting the power consumption of the load (power supply amount to the load) for each power storage device through the management unit 30, and this detection means It has a calculating means etc. which calculates the electric power use charge for every electric power storage device according to a detection result.

Next, the operation of the above configuration will be described with reference to the flowchart of FIG. First, operation control is performed in which the storage timing of each power storage device is set to the nighttime power time zone, the daytime time zone is time-divided, and the discharge timing of each power storage device is assigned to each time zone. That is, as shown in FIG. 4, the charger 37 operates and the storage battery module 36 is charged in all the power storage devices of the buildings 1 and 11 from 22:00 to 8:00 in the nighttime power time period when the power charge is low. It

During the daytime hours when the amount of electric power used is large, 10
From 18:00 to 18:00, the power storage devices 2a, 2b, 2 of the building 1
In one of c and 2d, power supply by discharging the storage battery module 36 is sequentially performed every two hours of allocation, and the remaining three power storage devices perform constant inverter power supply by the operation of the rectifying unit 31 and the inverter unit 32. Be seen.

On the side of the building 11 as well, from 10:00 to 18:00, power supply by discharge of the storage battery module 36 is sequentially executed for every two hours of allocation in one of the power storage devices 12a, 12b, 12c, 12d, and the remaining power is stored. In the three power storage devices, the inverter rectification unit 31 and the inverter unit 32 constantly perform inverter power feeding.

In this way, the power storage devices 2a, 2b, 2
By connecting c and 2d to the server 5 via the LAN 4 and controlling the storage and release of electric power in each power storage device by the server 5 in a centralized manner, it is possible to properly operate each power storage device, and to operate during the daytime. The electric power required in the building 1 in the time zone can be sufficiently secured in the building 1.

Also on the building 11 side, the power storage device 12
a, 12b, 12c, and 12d are connected to the server 5 via the LAN 14, the personal computer 15, and the Internet 20, and the server 5 centrally manages the storage and release of power in each power storage device. The power storage device can be properly operated, and the power required in the building 11 during the daytime can be sufficiently secured in the building 11.

Moreover, inexpensive nighttime electric power is stored in the storage battery module 36 of each electric power storage device, and the stored electric power is sequentially released during the daytime hours when the electric power consumption increases, as shown in FIG. As described above, the power consumption can be reduced by the amount of the stored power released. With this reduction,
It is possible to reduce the contracted electric power that is concluded with the electric power company. If the contracted power is reduced, the unit price, which is the standard for calculating the electricity usage fee, is also reduced. Therefore, it is possible to reduce the amount of electricity used, and to significantly reduce the cost, thereby improving the economical efficiency and the energy saving.

On the other hand, the amount of power supplied from each power storage device to the load is detected by the management unit 30 as the amount of power used on the load side. In the server 5, each management unit 3
The load-side power usage charge is calculated for each power storage device based on the power usage amount detected at 0 and the charge unit price stored in advance in the internal memory. These calculation results are displayed on the display of the server 5. In addition, the bill attached with the calculation result is periodically issued from the printer attached to the server 5.

The voltage, temperature, etc. of each sealed lead acid battery B in the storage battery module 36 of each power storage device are detected by the management unit 30, and the detection results are sent to the server 5. In the server 5, the deterioration or life of each sealed lead acid battery B is determined based on the detection result of each management unit 30. Regarding the sealed lead acid battery B that is severely deteriorated or the expired sealed lead acid battery B, that fact is displayed on the display of the server 5. The staff member who sees this display can take appropriate measures such as changing the corresponding sealed lead-acid battery B to a new one.

In the above embodiment, the open / close switch 3
The power storage device of the type (constant inverter power supply type) having the battery charger 5 and the charger 37 and charging the storage battery module 36 by the charger 37 has been described as an example. The power storage device of the type (constant commercial power supply type) in which the output voltage of (1) is flow-charged can be similarly implemented. In addition, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

[0031]

As described above, according to the present invention, it is possible to properly operate a plurality of electric power storage devices, so that necessary electric power can be surely discharged when necessary, and the entire electric power consumption can be used. It is possible to provide a distributed power storage system that can reduce the amount and improve economy and energy saving.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of an embodiment.

FIG. 2 is a diagram showing a specific configuration of a power storage device according to an embodiment.

FIG. 3 is a flowchart for explaining the operation of one embodiment.

FIG. 4 is a diagram for explaining an operation of each power storage device according to the embodiment over time.

FIG. 5 is a diagram showing the amount of electric power used in one embodiment in comparison with the related art.

[Explanation of symbols]

1 ... Building, 2a, 2b, 2c, 2d ... Power storage device, 3
... commercial AC power source, 4 ... LAN, 5 ... server, 11 ... building, 12a, 12b, 12c, 12d ... power storage device,
14 ... LAN, 15 ... Personal computer, 20 ...
Internet, 30 ... Management unit, 31 ... Rectification unit,
32 ... Inverter part, 33 ... AC switch part, 34 ... Bypass circuit, 35 ... Open / close switch, 36 ... Storage battery module, 37 ... Charger

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ichiro Kiyokawa             3-4-1 Shibaura, Minato-ku, Tokyo Co., Ltd.             Within NTT Facilities F-term (reference) 5G015 GA03 GA06 HA15 JA05 JA11                       JA21 JA52                 5G066 HA06 HB09 JA07 JB03

Claims (6)

[Claims] 1. A plurality of power storage devices that store power and discharge the stored power as needed, and a control unit that comprehensively manages storage and release of power of each of the power storage devices. A distributed power storage system characterized by the above. 2. The distributed power storage system according to claim 1, further comprising a network line for data transmission connected between each of the power storage devices and the control unit. Distributed power storage system. 3. The distributed power storage system according to claim 1, wherein the control unit sets the storage timing of each power storage device to a nighttime power time zone, and time-divides the daytime time zone into respective times. A distributed power storage system, comprising: operation control means for allocating a discharge timing of each power storage device to a band. 4. The distributed power storage system according to claim 1, wherein the control unit sets the storage timing of each power storage device to a nighttime power time zone, and time-divides the daytime time zone into respective times. Operation control means for allocating the discharge timing of each power storage device to the band, monitoring means for monitoring the state of each power storage device, detection means for detecting the power consumption of the load for each power storage device, and this detection means A distributed power storage system, comprising: a calculating unit that calculates a power usage charge according to a detection result. 5. The distributed power storage system according to claim 1, wherein each of the power storage devices is installed at a plurality of locations in a building. 6. The distributed power storage system according to claim 1, wherein each of the power storage devices is installed at a plurality of locations in each of a plurality of buildings.