JPS583534A - Automatic monitoring interval setting system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic monitoring interval setting method that can change the monitoring interval for monitoring power consumption in electricity demand control depending on the degree of necessity of power consumption control. It is.

Electricity demand control is performed in large electricity consumers such as buildings to prevent the amount of electricity used from exceeding the contracted amount. In other words, a certain period of time is considered as one cycle,
In order to ensure that the amount of electricity used within each cycle does not exceed the contract amount determined for each consumer, the amount of electricity used is read from the meter and the current measured value is compared with the previous measured value. The trend in power consumption is determined from the difference, and at the end of the cycle, the load is controlled so as not to exceed the contracted amount.

This kind of electricity demand control is necessary when the amount of electricity used is large and there is a risk of exceeding the contracted electricity amount, but when the amount of electricity used is small and there is no risk of exceeding the contracted electricity amount, It is desirable that the time interval for monitoring the amount of power used, which is not often required, and therefore for electricity demand control, be changed depending on the amount of power used.

However, in the past, such a variable monitoring interval method for electricity demand control has not been used, and the monitoring interval has been fixed, and even when it is changed, it has been divided into two stages depending on the time of day, for example, daytime and nighttime, and each is fixed. It was nothing more than being exposed.

For this reason, if the monitoring interval is set short according to the peak load, monitoring will be performed at a constant rate even when the amount of power used is low, resulting in wasted calculation time of the CPV (processing unit) that performs control. , which will reduce the efficiency of CPU usage. On the other hand, if the monitoring interval is set long, it will not be possible to quickly take action when the amount of power used is large. Furthermore, even if the monitoring interval is determined depending on the time of day, it is difficult to deal with a sudden increase or decrease in the amount of power used. In addition, it is generally not easy to change fixedly set time intervals, and may require human effort, so there is a risk of setting errors.

The present invention is a book that attempts to eliminate such drawbacks of the prior art, and its purpose is to determine the necessity of control from the current amount of power used and the trend of the amount of rice used for each cycle. It is an object of the present invention to provide a method that can determine the monitoring interval of the power consumption cover.

The monitoring interval automatic setting method of the present invention compares the amount of power used from the start of the current monitoring cycle with the predicted value of the amount of power used at the end of the cycle using constants on a table for each monitoring cycle. , the optimal monitoring interval is determined and automatically set. This allows the monitoring interval to be determined according to the current situation, so when control is not required much, it saves wasted CPU calculation time and when control is not required. When doing so, more detailed control and faster response can be performed, and since the monitoring interval is set by a program, no human intervention is required for setting, and there is no possibility of setting errors.

Hereinafter, the present invention will be described in detail with reference to Examples.

FIG. 1 explains a method for determining a predicted value of power consumption in an embodiment of the present invention. In the figure, the horizontal axis shows the elapsed time, and the vertical axis shows the amount of power used. The predicted value of power consumption t is determined by the following formula - In the above formula, F is the previous power consumption, W is the current power consumption, Δt is the monitoring interval, and ta is the monitoring cycle if
is the elapsed time up to the time of this measurement.

The predicted value obtained in this way is predicted from the amount of electricity used up to the previous time and the trend of the amount of electricity used obtained from the previous value and this value, and it does not exceed the target value Wo. control as follows.

FIG. 2 explains the determination method for determining the monitoring interval in one embodiment of the present invention. The monitoring interval is the constants A and B of the power consumption on the table.

The interval α is determined by C2... and the constants E, F, G,... of the predicted values.

bl'l..., -9f劃,... are determined. For example, when the amount of electricity used is smaller than A, the predicted value at that time is E.
If it is smaller than E, the interval is set to G, and if it is not smaller than E, the interval is set to -. If the amount of power used is not smaller than A, check whether it is smaller than B, and if it is smaller, compare the predicted value with F to determine the interval. When the amount of power used is not smaller than B, it is further compared with C, and thereafter in the same order to determine the monitoring interval.

FIG. 6 is a block diagram showing the configuration of an embodiment of the monitoring interval automatic setting method of the present invention. In the figure, 1 is a power meter, 2 is a timer, 6 is a measured value acquisition means, 4 is a disk memory, 5 is a table, 6 is a prediction means, 7 is a comparison means, 8 is an interval determination means, 9 is a control means, 10-1+10-2+1
05 is the load.

In FIG. 6, the wattmeter 1 generates an integrated value of the amount of power used. Timer 2 generates measurement time data. The measured value acquisition means 5 thereby generates measured value data for each monitoring interval and inputs it to the prediction means 6. On the other hand, the disk memory 4 has data on the power amount at the start of the cycle on a table 5 provided thereon, and the prediction means 6
Based on these data, the previous power consumption and current power consumption from the start of the cycle are determined and stored in table 5. The table 5 further includes data on the previous measurement time, and a predicted value is calculated using equation (1) using these data. The predicted value obtained in this way is input to the comparing means 7, and the current power consumption lid and the constants A, B, and C of the power consumption on the table 5 are obtained.

. . . and the constants E, F, G, . . . of the predicted values, a comparison is made according to the method explained in FIG.

The interval determining means 8 determines the monitoring interval α161' based on the comparison result of the comparing means 7. ...+'J+(Is...).The measurement time in timer 2 is determined by this.Meanwhile, in comparing means 7, the predicted value and each cycle on table 5 are selected. When the predicted value exceeds the target value, a command is issued to the control means 8, and the control means 9 accordingly turns on/off the load '01+10-2.10-3. Off control is used to adjust the amount of power used so that the amount of power used does not exceed the target value at the end of the cycle.

As explained above, according to the monitoring interval automatic setting method of the present invention, based on the current amount of power consumption and the trend of power consumption,
The optimal monitoring interval for power consumption can be determined. As a result, the monitoring interval is always determined according to the current situation, so when there is little need for control, the monitoring interval can be lengthened to save time for calculating cpv.

On the other hand, when there is a large need for control, by shortening the monitoring interval, more detailed control and quick response can be achieved. Furthermore, since the monitoring interval is set by a program, no human intervention is required for setting, and there is no possibility of setting errors, which is extremely effective.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a method for determining the predicted value of power consumption, Fig. 2 is a flowchart showing a judgment method for determining the monitoring interval, and Fig. 3 is an embodiment of the monitoring interval automatic setting method of the present invention. FIG. 2 is a block diagram showing the configuration of FIG. DESCRIPTION OF SYMBOLS 1... Power meter, 2... Timer, 3... Measured value acquisition means, 4... Disk memory, 5... Table, 6
... Prediction means, 7. Comparison means, 8. Interval determination means, 9. Control means, 10-1.10-2.10-
s...Load patent applicant Fujitsu Limited

Claims (1)

[Claims] The measurement results of the power consumption from the start of the monitoring cycle to the present, the difference between the power consumption at the previous measurement and the current measurement, the time interval between the current measurement and the previous measurement,
In electricity demand control, the predicted power consumption is determined from the remaining time in the monitoring cycle, and the load is controlled based on the predicted power consumption so that the power consumption for each monitoring cycle does not exceed the contract amount. A table is provided in which monitoring intervals are determined depending on the magnitude of each amount of power used compared to a predetermined predicted amount of power, and the monitoring interval is set by comparing the current amount of power used and the predicted amount of power used with the table. An automatic monitoring interval setting method that performs measurement.