JP2001339855A - Method and apparatus for controlling power storage air adjusting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently and effectively utilize the electrical power in the time zone wherein the demand for electrical power is smallest. SOLUTION: When the time required for charging is calculated by adding a first stage charging time, a second stage charging time and a third stage charging time and the charging process is started from the bottom time, it is determined whether the charging process can be ended or not until start of discharging process. When it is determined that the charging process can be terminated until start of discharging process, the charging start time is set to the bottom period. On the contrary, when it is determined that the charging process cannot be terminated until start of discharging process, the discharging start time can be calculated by subtracting the required charging time from the discharging start time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to charging a secondary battery during a time period when power demand is small, and operating an air conditioner using discharge power from the secondary battery during a time period when power demand is high. The present invention relates to a method and a device for controlling a power storage air conditioner.

[0002]

2. Description of the Related Art Conventionally, a storage battery air conditioner in which a secondary battery is charged during a time when power demand is small and an air conditioner is operated by using discharge power from the secondary battery during a time when power demand is high. A device has been proposed.

In such a storage air conditioner, charging of the secondary battery is performed by multi-stage constant current charging (for example, three-stage constant current charging), and the charging start time of the secondary battery is set. It is set at a predetermined time set in advance (for example, 1:00 am).

[0004] In the multi-stage constant current charging, the first-stage charging ends when the voltage value of the secondary battery exceeds a predetermined value (for example, a value corresponding to 80% of the secondary battery capacity). However, the second and third stages of charging are terminated based on the amount of charge (Ah value).

Further, the secondary battery is charged and discharged (Ah discharge) according to a preset schedule.

[0006]

Considering the effective use of electric power (for example, midnight electric power) in a time zone where the electric power demand is small, the secondary power is located at the bottom of the electric power load curve (the area where the electric power load is the smallest). It is desirable to perform the first-stage charging of the battery. Here, as can be seen from "How to use electricity in one day" (see Fig. 9) created by TEPCO,
The least electricity is used (at the bottom) around 3 hours from 3 am to 6 am However, this bottom time zone differs slightly depending on the jurisdiction of each power company.

If the amount of discharge on the previous day is sufficiently large, the relationship between the charging current and the time is as shown in FIG. 10, and the time period of the bottom and the charging of the first stage with respect to the secondary battery are not performed. Although there is an overlap time, if the amount of discharge on the previous day is small, the relationship between the charging current and the time is as shown in FIG. 11, and the first-stage charging of the secondary battery ends early, Before the bottom time zone arrives,
The charging of the tier ends.

As a result, there is a disadvantage that the electric power in the time zone where the electric power demand is small cannot be fully and effectively utilized.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a method and a device for controlling a power storage air conditioner capable of fully and effectively utilizing electric power in a time zone where power demand is small. It is intended to be.

[0010]

According to a first aspect of the present invention, there is provided a method for controlling a storage air conditioner, comprising: charging a secondary battery during a time period when power demand is small; and discharging electric power from the secondary battery during a time period when power demand is high. In controlling a power storage air conditioner that operates an air conditioner by using a method, a time zone in which power demand is the least is detected, and the first-stage charging of the secondary battery is performed in this time zone. .

[0011] According to a second aspect of the present invention, there is provided a method for controlling a power storage air conditioner.
A method of predicting the required charging time for the secondary battery, determining the charging start time from the predicted charging required time and the time zone where the power demand is least, and charging the secondary battery from the determined charging start time. is there.

[0012] A method for controlling a power storage air conditioner according to claim 3 is as follows.
This is a method of correcting the charging start time to satisfy this request, on condition that it is required to set the charging end time before a predetermined time.

According to a fourth aspect of the present invention, there is provided a power storage air conditioner control device,
The power storage air conditioner controls charging of the secondary battery during a time period when power demand is small, and operation of the air conditioner using discharge power from the secondary battery during a time period when power demand is large, And a charging control means for detecting a time zone where the power demand is the least and charging the first stage of the secondary battery in this time zone.

According to a fifth aspect of the present invention, there is provided a power storage air conditioner control device,
The charging control means predicts a required charging time for the secondary battery, determines a charging start time from a time zone in which the predicted required charging time and power demand are the least, and determines a secondary battery from the determined charging start time. That charge the battery.

According to a sixth aspect of the present invention, there is provided a power storage air conditioner control device,
When it is required to set the charging end time to a predetermined time before the charging control means, a means for correcting the charging start time to satisfy this request is adopted.

[0016]

According to the power storage air conditioner control method of the present invention, the secondary battery is charged during a time period when the power demand is small, and the air is discharged using the discharged power from the secondary battery during a time period when the power demand is high. In controlling the power storage air conditioner that operates the conditioner, a time zone in which the power demand is least is detected, and the first-stage charging of the secondary battery is performed in this time zone. The electric power in the smallest time zone can be fully utilized.

According to the control method of a storage air conditioner of the present invention, the required charging time for the secondary battery is predicted, and the charging start time is determined from the predicted charging required time and the time zone where the power demand is the least. Since the secondary battery is charged from the determined charging start time, all or a considerable portion of the charging of the first stage of the secondary battery can be performed during the time period when the power demand is the least, and as a result, The power in the time zone in which the power demand is the least can be sufficiently utilized.

According to the third aspect of the present invention, on the condition that it is required to set the charging end time before a predetermined time, the charging start time is corrected to satisfy this request. Therefore, it is possible to observe the restriction of the charging end time and to sufficiently and effectively use the power in the time zone where the power demand is the smallest.

According to the storage air conditioner control device of the present invention, the secondary battery is charged during a time period when the power demand is small, and the air is discharged by using the discharge power from the secondary battery during a time period when the power demand is high. In controlling the power storage air conditioner that operates the conditioner, the charging control unit may detect a time zone in which the power demand is the least, and perform the first-stage charging of the secondary battery in this time zone. it can.

Therefore, it is possible to make full use of the power in the time zone where the power demand is the smallest.

In the power storage air conditioner control apparatus according to the present invention, the charging control means predicts the required charging time for the secondary battery, and calculates the required charging time and the power demand from the time zone having the least power demand. Since the charging start time is determined and the secondary battery is charged from the determined charging start time, all or a considerable part of the first stage charging of the secondary battery is most demanded by the power demand. It can be performed in a small time zone, and the power in the time zone in which the power demand is the least can be sufficiently utilized.

In the storage air conditioner control device according to the present invention, when it is required that the charging end time is set to a predetermined time before the charging control means, the charging start is performed to satisfy the request. Since the one that corrects the time is adopted, it is possible to observe the restriction of the charging end time and to sufficiently and effectively use the power in the time zone where the power demand is the smallest.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a control method of a power storage air conditioner according to a first embodiment of the present invention;

FIG. 1 is a block diagram schematically showing a configuration of a power storage air conditioner.

This power storage air conditioner has rectifier circuits 1 and 7 having an AC power supply as input, an inverter 2 having a DC voltage output from the rectifier circuit 1 as an input, and an output voltage from the inverter 2 as an input. The compressor motor 3, a secondary battery 4 such as a lead storage battery, and a DC voltage output from the rectifier circuit 7 are input to charge the secondary battery 4, or to discharge DC from the secondary battery 4. It has a DC / DC converter 5 for supplying a voltage to the DC side of the inverter 2, and a charge / discharge controller 6 for controlling the DC / DC converter 5.

Therefore, the leveling of the power load is achieved by charging the rechargeable battery 4 during the time when the power demand is small and discharging the rechargeable battery 4 during the time when the power demand is high. Can be.

FIG. 2 is a block diagram showing the configuration of the charge / discharge controller 6 in detail.

The charge / discharge controller 6 is a storage unit 1 for storing data supplied through an input device (not shown).
1, a timer 12, a battery voltage detection circuit 13 for detecting the voltage of the secondary battery 4, a battery current detection circuit 14 for detecting the secondary battery current via a current transformer 14a, A charge amount detection unit 15 that detects a charge amount (charge Ah value) for the secondary battery 4 using an output value from the timer 12 as an input, and a secondary battery using a secondary battery current detection value and an output value from the timer 12 as an input. 4, a discharge amount detection unit 16 for detecting a discharge amount (discharge Ah value), data stored in the storage unit 11, an output value from the timer 12, a charge amount detected by the charge amount detection unit 15, and a discharge amount. Charge / discharge control is performed by using the discharge amount detected by the amount detection unit 16, the voltage of the secondary battery 4 detected by the battery voltage detection circuit 13, and the secondary battery current detected by the battery current detection circuit 14 as inputs. A charge / discharge control unit 17, a constant current control unit 18 that performs constant current control with a charge / discharge control signal output from the charge / discharge control unit 17 as an input, and a constant current control signal output from the constant current control unit 18. It has a converter drive unit 19 that outputs a drive signal as an input and supplies the drive signal to the DC / DC converter 5.

Next, a charge / discharge control process by the charge / discharge controller 6 will be described with reference to flowcharts shown in FIGS.

First, the charging Ah control processing flowchart shown in FIG. 3 will be described.

In step SP1, the process waits until the charging start time comes. In step SP2, the first-stage charging of the secondary battery 4 is performed.
It is determined whether or not the voltage of the secondary battery 4 has exceeded the first-stage charge end-to-end voltage. If not, the process of step SP2 is performed again.

If it is determined in step SP3 that the voltage of the secondary battery 4 has exceeded the first-stage charge end-to-end voltage, it is determined in step SP4 whether the charge amount has exceeded 90% of the discharge amount of the previous day. If it is determined that it has not exceeded, in step SP5, the second-stage charging of the secondary battery 4 is performed, and in step SP6,
It is determined whether the charge amount has exceeded 90% of the discharge amount of the previous day, and if not, the process of step SP5 is performed again.

If it is determined in step SP4 that the charge amount has exceeded 90% of the discharge amount of the previous day, it is determined in step SP7 whether the charge amount has exceeded 100% of the discharge amount of the previous day.

If it is determined in step SP6 that the charge amount has exceeded 90% of the previous day's discharge amount, or if it is determined in step SP7 that the charge amount has not exceeded 100% of the previous day's discharge amount, In step SP8, the third-stage charging of the secondary battery 4 is performed. In step SP9, it is determined whether or not the charge amount has exceeded 100% of the discharge amount of the previous day. , The processing of step SP8 is performed again.

If it is determined in step SP7 or SP9 that the charge amount has exceeded 100% of the discharge amount of the previous day, a series of processing ends.

Next, a flow chart for explaining the discharge Ah control processing shown in FIG. 4 will be described.

In step SP1, the process waits until the discharge start time, and in step SP2, the secondary battery 4 is discharged. In step SP3, it is determined whether or not the voltage of the secondary battery 4 has fallen below the discharge end voltage. However, if it is determined that the discharge amount is not lower than the discharge end voltage, it is determined in step SP4 whether the discharge amount has exceeded the specified amount, and if it is determined that the discharge amount has not been exceeded, Performs the process of step SP2 again.

If it is determined in step SP3 that the voltage of the secondary battery 4 has become equal to or lower than the discharge end voltage, or if it is determined in step SP4 that the discharge amount has exceeded the specified amount, a series of processing is performed as it is. finish.

Further, a flowchart for explaining the charging start time determining process shown in FIG. 5 will be described.

In step SP1, the first-stage charge amount is calculated by subtracting 20% of the battery capacity from the previous day's discharge amount. In step SP2, the first-stage charge amount is calculated using the first-stage charge current value. The first-stage charge time is calculated by division, and in step SP3, the first-stage charge time is calculated based on 90% of the discharge amount of the previous day.
The second-stage charge amount is calculated by subtracting the second-stage charge amount, and in step SP4, the second-stage charge time is calculated by dividing the second-stage charge amount by the second-stage charge current value. Step SP
In step 5, the first-stage charge amount and the second-stage charge amount are subtracted from the previous day's discharge amount to calculate the third-stage charge amount. In step SP6, the third-stage charge amount is calculated in the third-stage charge amount. The third stage charging time is calculated by dividing by the charging current value.
In P7, the first-stage charging time, the second-stage charging time, and the third-stage charging time are added to calculate the required charging time. In step SP8, when the charging is started from the bottom time, the discharging is started. It is determined whether charging can be completed by the time.

If it is determined that the charging can be completed before the discharge start time, in step SP9,
If the charging start time is set to the bottom period, and if it is determined that charging cannot be completed by the discharge start time, in step SP10, the discharge start time is calculated by subtracting the required charging time from the discharge start time. .

Processing in step SP9 or step S
When the processing of P10 has been performed, the series of processing ends.

Therefore, if the processing of the flowchart of FIG. 5 is performed, the optimal charging start time can be determined in consideration of the bottom time, the discharging start time, and the required charging time, and the electric power in the time zone where the power demand is the smallest can be determined. Can be fully utilized. Specifically, it is as follows. However, the first stage charging current is 17 A, the second stage charging current is 7 A, the third stage charging current is 3.5 A, the discharge start time is 8:00 am, the charge start request time is 3:00 am, the secondary The capacity of the battery 4 is set to 70 Ah.

When the discharge amount of the previous day was 63 Ah,
The first stage charging time is 2 hours and 53 minutes, the second stage charging time is 1 hour and 06 minutes, the third stage charging time is 1 hour and 48 minutes, and the required charging time is 5 hours and 47 minutes. When charging is started, the charging end time passes the discharging start time by 47 minutes. Therefore, by starting charging at 2:13 am, charging can be completed by the discharge start time (see FIG. 6).

When the discharge amount of the previous day was 42 Ah, the first stage charge time was 1 hour and 39 minutes, the second stage charge time was 1 hour and 24 minutes, and the third stage charge time was 1 hour and 24 hours. It takes 12 minutes, the required charging time is 4 hours and 15 minutes, and the charging can be completed by the discharge start time even if the charging is started at 3:00 am.

However, it is possible to input the charging start request time through the input device, store it in the storage unit 11, and start the first-stage charging using the charging start request time. Then, in this case, by setting the charging start request time to the bottom time, it is possible to sufficiently and effectively use the power in the time zone where the power demand is the smallest. Specifically, as shown in FIG. 7 (when the discharge amount on the previous day was large) and FIG. 8 (when the discharge amount on the previous day was small), the first-stage charging can be performed in the bottom time. 10, the electric power in the time zone where the electric power demand is the smallest can be sufficiently and effectively used as compared with FIG.

[0047]

According to the first aspect of the present invention, there is a specific effect that the electric power in the time zone in which the electric power demand is the smallest can be fully utilized effectively.

According to the second aspect of the present invention, all or a substantial part of the charging of the first stage of the secondary battery can be performed in the time zone where the power demand is the least, and thus the power consumption in the time zone where the power demand is the smallest. Has a unique effect that can be effectively utilized.

According to the third aspect of the present invention, there is a specific effect that the restriction on the charging end time can be maintained, and the electric power in the time zone where the electric power demand is the smallest can be sufficiently and effectively used.

The invention according to the fourth aspect has a unique effect that the electric power in the time zone where the electric power demand is the smallest can be sufficiently utilized effectively.

According to a fifth aspect of the present invention, all or a substantial part of the charging of the first stage of the secondary battery can be performed in the time zone where the power demand is the least, and thus the power consumption in the time zone where the power demand is the smallest. Has a unique effect that can be effectively utilized.

The invention according to the sixth aspect has a specific effect that the restriction of the charging end time can be maintained, and the electric power in the time zone where the electric power demand is the smallest can be sufficiently used effectively.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing a configuration of a power storage air conditioner.

FIG. 2 is a block diagram showing a configuration with a charge / discharge controller in detail.

FIG. 3 is a flowchart illustrating a charging Ah control process.

FIG. 4 is a flowchart illustrating a discharge Ah control process.

FIG. 5 is a flowchart illustrating a charging start time determination process.

FIG. 6 is a diagram illustrating a charging Ah control process based on a specific example of determining a charging start time.

FIG. 7 is a diagram showing a charge Ah control process when the amount of discharge on the previous day is large.

FIG. 8 is a diagram showing a charge Ah control process when the amount of discharge on the previous day is small.

FIG. 9 is a diagram illustrating a bottom time.

FIG. 10 is a diagram showing a conventional charge Ah control process when the amount of discharge on the previous day is large.

FIG. 11 shows a conventional charge Ah in a case where the amount of discharge on the previous day is small.
It is a figure showing control processing.

[Explanation of symbols]

 4 Secondary battery 6 Charge / discharge controller

Claims (6)

[Claims] 1. Charging a secondary battery (4) during a time period when power demand is small, and operating an air conditioner using discharge power from the secondary battery (4) during a time period when power demand is high. What is claimed is: 1. A method for controlling a storage air conditioner, comprising: detecting a time zone during which power demand is the least, and charging the first stage of a secondary battery (4) during this time zone. Harmonic device control method. 2. A charging time required for the secondary battery (4) is predicted, a charging start time is determined from the predicted charging time and a time zone in which the power demand is the least, and the charging start time is determined from the determined charging start time. The method according to claim 1, wherein the secondary battery (4) is charged. 3. The method according to claim 2, wherein the charge start time is corrected to satisfy the request on the condition that it is required to set the charge end time before a predetermined time. . 4. Charging the secondary battery (4) during a time period when power demand is small, and operating the air conditioner using discharge power from the secondary battery (4) during a time period when power demand is high. A charge control unit (6) for controlling a power storage air conditioner, which detects a time zone during which power demand is the least and charges the first stage of the secondary battery (4) during this time zone. A storage air conditioner control device, comprising: 5. The charging control means (6) predicts a charging time required for the secondary battery (4), and determines a charging start time from the predicted charging time and a time zone in which power demand is the least. The storage air conditioner control device according to claim 4, wherein the secondary battery (4) is charged from the determined charging start time. 6. The charge control means (6) corrects a charge start time so as to satisfy the request, on condition that it is required to set a charge end time before a predetermined time. The storage air conditioner control device according to claim 5.