JP2001008385A - Power storing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storing system which enables a user to use economical nighttime power without waste. SOLUTION: A power storing system is provided with a battery 5 and a bidirectional inverter 4, which converts the AC power of commercial power supply into a direct current and the DC output of the battery 5 into an alternating current, stores the AC power of the commercial power supply in the battery 5, and supplies the power stored to electrical equipment. The system is also provided with a control section 33, which stores several types of one-day discharge patterns of the battery 5 in advance so that the user of the system can select the patterns and controls the one-day discharge pattern of the battery 5. When the power storing system is constituted in this way, the user can effectively use economical nighttime power charged in the battery 5 without waste, because the using pattern of the nighttime power can be set in accordance with the daily living pattern of the user. Consequently, the electricity charges to the user can be reduced, and power loads can be leveled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power storage system suitable for use in a house, comprising a storage battery for storing commercial power and discharging the storage battery according to a daily discharge pattern.

[0002]

2. Description of the Related Art In recent years, in the field of industry, power consumption has been increased due to an increase in the number of devices and equipment used for improving working environment comfort, automation and labor saving in a production section, and an increase in various information devices in an office section. The use of is growing significantly.
On the other hand, with the development of comfortable living environments such as home electronics, automation, and labor savings in general households, the use of many AV and information devices, lighting facilities, large refrigerators, The use of washing machines, dryers, and air-conditioning equipment has been progressing, and the power consumption in general households has also increased significantly.

In order to respond to the increasing demand for electric power, electric power companies that supply electric power are particularly required to provide full operation of production facilities and cooling facilities at each business site in fine weather in summer, and to provide cooling facilities for ordinary households. At the peak of the so-called electric power demand that is fully operated, the power generation facilities are operated at full capacity to respond to this. As described above, power companies that supply power are required to have large-scale facilities to meet peak demand for power, but there are many restrictions on the location of power plants and environmental issues. There are conditions, and it is no longer possible to meet the increasing power demand by providing facilities for producing power at the peak of the increasing power demand.

[0004] For this reason, in the industry, the work time is shifted in order to use inexpensive commercial nighttime electric power, heat storage using inexpensive commercial nighttime electric power, the use of cooling / heating equipment by electric power storage, and the effective use of electric energy. In addition to energy saving measures such as the use of electrical equipment with low power consumption, households are also using energy-saving measures such as the use of inexpensive commercial night power. A large-capacity storage battery is used to store the power, and the power stored in the storage battery is used during a relatively expensive daytime power period to reduce the power rate.

The use of such a distributed power storage system to store inexpensive nighttime power in a storage battery and use the stored power at the peak of daytime power demand reduces the power consumption for consumers. Power supply companies that supply electricity do not need to have excessive facilities for peak power demand during the daytime, so the power demand is dispersed between the daytime and nighttime, and the power load is reduced. It can play a role in leveling.

[0006] The power storage system itself that uses this large-capacity storage battery to store inexpensive nighttime power and use it in expensive daytime power hours to reduce power charges and achieve power load leveling. Is known (Japanese Unexamined Patent Publication No.
No. 32322). This conventional technique aims to achieve load leveling by discharging storage battery power during a peak power load in the daytime. Since the battery power is used for a load higher than the contract power, there is an advantage that the contract power can be set low.

[0007]

However, when this system is used in ordinary households, it may not be possible to use battery power effectively and efficiently. Electricity usage patterns in general households are more diverse than in offices and the like. For example, when nobody is at home during the day due to going out on weekdays and holidays, or when leaving home for several days on a trip or the like, the time zone during which maximum power is generated and the amount of power vary.

[0008] In particular, when a house is left for a few days on a trip or the like, no more power than the contract power is used, so that the power charged in the storage battery is never used. Therefore, the present invention
According to the above-mentioned problem, it is possible to discharge a storage battery according to a “daily storage battery discharge pattern” according to a different power consumption pattern depending on the day, and to effectively use the cheap nighttime power stored in the storage battery without waste. It is an object of the present invention to provide a power storage system capable of performing the above.

[0009]

SUMMARY OF THE INVENTION An electric power storage system according to the present invention stores a commercial electric power and supplies the electric power to a load device based on one of a plurality of "daily storage battery discharge patterns". Control means for controlling the discharge pattern of the storage battery. In addition, the “one-day storage battery discharge pattern” includes a weekday pattern that is a weekday discharge pattern and a holiday pattern that is a holiday discharge pattern, thereby forming a typical “one-day storage battery discharge pattern”. Weekday pattern and holiday pattern.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram of the power storage system of the present invention. Commercial power system 1 is wattmeter 2
, And is connected to the system switching device 3. Inside, the system is divided into a system going to the power outlet 8 via the in-house distribution board 7 and a system going to the storage battery 5 via the bidirectional inverter 4. A first switch (SW) 31 and a second switch (SW) 32 are provided inside the system switching device 3, and switch the power system. Further, there is a control unit 33 for switching the SW, controlling the operation of the bidirectional inverter 4 and monitoring the storage battery 5.

The storage battery 5 is monitored by monitoring its charge / discharge state, temperature, and the like. The control unit 33 has a timer function for measuring time and a storage function for storing a switching pattern of the first SW 31 and the second SW 32. Further, the operation unit 6 is provided in a place where the operation is easy in the house, and is connected to the control unit 33. The operation unit 6 is provided with a switch SW for selecting a usage pattern of the storage battery power, and determines the “daily storage battery discharge pattern” stored in the operation unit 33 according to the selected switch SW.

Next, the operation of a general system will be described. In the cheap nighttime power zone, the first switch 31 and the second switch 32 are turned on to supply the AC power from the commercial power system 1 to the load equipment connected to the normal outlet 8, and the bidirectional inverter 4 converts the AC power into the DC power. Then, the storage battery 5 is charged. When the control unit 33 detects that the storage battery 5 is fully charged, the operation of the bidirectional inverter 4 is stopped, and the charging of the storage battery 5 is completed.
2 is turned OFF.

When the storage battery power is used outside the night power time zone, the first SW 31 is turned off, and the second SW 32
Is turned on, the DC power of the storage battery 5 is converted into AC power by the bidirectional inverter 4 and supplied to the load equipment connected to the normal outlet 8. When the storage battery power is not used, or when the storage battery capacity decreases to a preset lower limit, the operation of the bidirectional inverter 4 is stopped, and the discharge of the storage battery 5 is terminated, and at the same time, the first SW 31 is turned on, and the second SW 32 is turned off. The AC power from the power system 1 is supplied to load equipment connected to the normal outlet 8.

Next, a storage battery use pattern will be described. The storage battery usage patterns are roughly divided into three patterns: "weekday pattern", "holiday pattern", and "absence pattern".
The details are four patterns obtained by further adding the "travel pattern" to the "absence pattern". Further, it is preferable that the user can set the parameters by using the operation unit 6 by himself / herself.

The user causes the control unit 33 to store the storage battery use pattern in a manner such as, for example, video recording. In other words, the day and day of the week are specified by the calendar,
The time is specified by the timer, and the discharge or charge for the specified time is selected. In the case of the discharge, the discharge power per unit time is specified and input to the control unit 33. The discharge power amount per unit time may be automatically specified from the total discharge time of one day.

The amount of electric power used in ordinary households is large when cooking, using an air conditioner, using a hair dryer, etc., and the storage battery use pattern is stored with reference to these. An example of the usage pattern is shown below. First, the weekday pattern will be described with reference to FIG.

Charging is performed during the night, from 23:00 to 7:00 in the morning. During this time, as described above, the first
SW31 and the second SW32 are turned ON, and the commercial power system 1
The AC power is supplied to the load device connected to the outlet 8 and the DC power is converted by the bidirectional inverter 4 to charge the storage battery 5. When the control unit 33 detects that the storage battery 5 is fully charged, the operation of the bidirectional inverter 4 is stopped, and at the same time the charging of the storage battery 5 is completed, the second SW 32 is turned off.

On the other hand, the time zone in which the amount of power consumption is large depends on the season, but is almost fixed, and the power of the storage battery 5 is set to be used in that time zone. If it is a weekday, as shown, the first time period from approximately 7:00 to 10:00, and 1
The second time period from 2:00 to 14:00 and from 17:00 to 20
In a third time period up to the hour, power consumption increases and peaks. The discharging time zone and the discharging power amount are shown as a meshed area.

Therefore, in these three time zones,
Discharge the stored power at night. This discharge causes the first SW 31 to turn off as described above.
F, turning on the second SW 32 to convert the DC power of the storage battery 5 into AC power by the bidirectional inverter 4 and supply the AC power to the load equipment connected to the normal outlet 8. Explaining using an equation: Q1 = Q2 + Q3 + Q4 (unit is Wh) Q1: Electric energy charged at night Q2: Discharge amount in first time zone (7 to 10:00) Q3: Second time zone ( 12-4 o'clock) Q4: The discharge amount during the third time period (17-20 o'clock). That is, the amount of power Q1 charged at night is equal to the sum of the amounts discharged at three time zones during daytime.

Next, the holiday pattern will be described with reference to FIG. In ordinary houses, mid-summer and mid-winter holidays may use the air conditioner all day,
The setting is such that the power of the storage battery 5 is used on average. Charging is performed at night, from 23:00 to 7:00 in the morning,
In this example, electric power is used on average from 7:00 in the morning to 23:00 in the evening. To explain by using the equation, Q1 = Q5 (unit is Wh) Q1: electric energy charged at night Q5: electric discharge at daytime As shown, the amount of discharge power per unit time at the time of discharge is smaller than that of FIG.

Next, the absence pattern will be described with reference to FIG. When going out in the daytime and leaving the house, the power of the storage battery 5 is set to be used in the morning or at night. According to the illustrated example, the power consumption increases in the fourth time zone from about 7:00 to 10:00 and the fifth time zone from 18:00 to 21:00, and two peaks are created.

Therefore, in these two time zones,
Discharge the stored power at night. Explaining using an equation: Q1 = Q6 + Q7 (unit is Wh) Q1: Electric energy charged at night Q6: Discharge amount in fourth time zone (7 to 10:00) Q7: Fifth time zone ( 18-18 hours). In this case, the amount of discharge power per unit time at the time of discharge is larger than that in FIG.

Further, a travel pattern will be described with reference to FIG. When the user is away for a few days during a trip or the like, there is only standby power such as a refrigerator or a video, so that all daytime power is set to be covered by the power of the storage battery 5. Explaining using an equation, Q1 ≧ Q8 (unit is Wh) Q1: electric energy charged at night Q8: electric discharge during daytime.

The user stores the discharge pattern of the storage battery for one day in the above-described example in the control unit 33, and operates the SW of the operation unit 6 according to his / her daily life. Select the battery discharge pattern. Alternatively, the storage battery discharge pattern for one day may be automatically selected according to the calendar day or day of the week. Here, even if the power consumption exceeds the contracted power even outside the battery usage time zone, the excess is covered by the power of the storage battery 5. In addition, the storage battery discharge pattern for one day such as the above example may be stored in the control unit 33 in advance, and the user may be able to correct the pattern by operating the operation unit 6 as desired, such as during a business trip. .

[0025]

Since the usage pattern of the storage battery power can be set according to the daily life pattern, the inexpensive nighttime power charged in the storage battery is smoothed and discharged in a necessary time zone, so that the storage battery can be used effectively and efficiently. As a result, the electricity cost can be reduced, and the power load can be leveled.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a power storage system of the present invention.

FIG. 2 is a graph showing charging and discharging of power in a weekday pattern of the power storage system of the present invention.

FIG. 3 is a graph showing charging and discharging of power in a holiday pattern of the power storage system of the present invention.

FIG. 4 is a graph showing charging / discharging of power in an absence pattern of the power storage system of the present invention.

FIG. 5 is a graph showing charging and discharging of power in a travel pattern of the power storage system of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Commercial power system 2 Wattmeter 3 System switching device 4 Bidirectional inverter 5 Storage battery 6 Operation part 7 In-house distribution board 8 Power outlet 31 First switch 32 Second switch 33 Control part (control means)

Claims (2)

[Claims] 1. A storage battery that stores commercial power and supplies the power to load equipment, and control means that controls a discharge pattern of the storage battery based on one of a plurality of “daily storage battery discharge patterns”. A power storage system comprising: 2. The daily storage battery discharge pattern includes a weekday pattern that is a weekday discharge pattern and a holiday pattern that is a holiday discharge pattern. Power storage system.