JPH06189452A - Method for controlling power load - Google Patents

Abstract

PURPOSE:To eliminate cases where a working power becomes too small by shutting off a load when a predicted electric energy is too high during a monitoring time. CONSTITUTION:When a predicted electric energy during a monitoring time, computed by a predicted electric energy computing means 13, exceeds a target value, a load controlling means 15 multiplies the extra electric power by a factor corresponding to a remaining monitoring time, obtained from an adjusting power factor table 17 to determine an adjusting power. The load controlling means 15 then stops equipment equivalent to the resultant adjusting power. When a computed predicted electric energy during a monitoring time is below the target value, the load controlling means 15 actuates equipment equivalent to a deficiency of restoring electric energy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power load control system, and more particularly to a power load control system used in a supervisory control system for a plurality of electric equipment installed in a building.

[0002]

2. Description of the Related Art Conventionally, in this type of power load control method, as shown in the typical configuration diagram of FIG. 3, a used power measuring means 11, a used power amount calculating means 12, and a predicted power amount calculating means 13 are shown. , A load control determination means 24, a load control means 25, and a graph display means 16, and the graph display means 16 corresponds to a constant monitoring time, for example, 30 minutes, as shown in two content examples in FIG. The contract power amount 101, the limit power value 102, the target power amount 103, the target power line 111, the actual power line 112, and the predicted power line 113 are displayed. In the above configuration, the power load control is
After the control is started, the used electric power measuring means 11 reads the measured value of the integrated electric power meter, for example, at a 1-minute cycle, and the used electric energy calculating means 12
Calculates the power consumption up to the current cycle of the monitoring time based on this measured value and the measured value in the previous cycle. When this processing reaches another preset cycle, for example, a 5-minute cycle, the predicted power amount calculation means 13 calculates the predicted power amount 114 at the final time of the monitoring time from the average value of the changes in the used power amount for the previous 5 minutes. Ask. The graph display means 16 has a contracted electric power amount 101 which is a value of 30 minutes of the used electric power amount contracted with the electric power company, and a limit electric power amount 102 which is set so as not to exceed the contracted electric power amount 101 when performing electric power load control. And the target power amount 103 and the target power line 11 corresponding to the target power amount 103
1 and the actual power line 112 corresponding to the amount of power used are displayed in a graph for each 1-minute cycle, but when the predicted power amount 114 is obtained, the predicted power line 113 corresponding to the predicted power amount 114 is also displayed in a graph. Next, as shown in FIG. 4A, for example, the load control determination unit 24 determines that the predicted power amount 114> the target power amount 103 and the actual power line 112 is the target power line 11
When it exceeds 1, the predicted power amount 114 is set to the target power amount 1
Judgment for suppressing within 03 is performed. Load control means 2
In response to this determination, 5 stops the equipment that can be stopped and adjusts the power consumption. The power to be adjusted at this time is calculated by (predicted power amount-target power amount) × 30 / remaining monitoring time, and the facility load group that is a control target in advance corresponding to this power is stopped. This processing is performed in a 5-minute cycle during a monitoring time of 30 minutes, and the stopped equipment load group is shown in FIG.
Even if the predicted power amount 114 becomes lower than the target power amount 103 as shown in, the restart is not performed within the monitoring time, and the predicted power amount when the control is newly started after the monitoring time of 30 minutes has elapsed. When 114 does not reach the target power amount 103, the equipment load group that is commensurate with the surplus power up to the target power amount 103 is restarted.

[0003]

In the conventional load control method described above, the value to be adjusted is used as it is, and the load is stopped, and the load is stopped within the same monitoring time as the stop control. Since the load is not restarted, the facility can often be operated only with a power consumption much lower than the target power consumption 103, which is the target power consumption, and there is a drawback that the facility cannot be efficiently operated.

[0004]

The power load control system of the present invention is used in a supervisory control system for a plurality of electric equipment installed in a building, and the amount of electric power used in a first cycle within a constant monitoring time. In the power load control method of controlling the usage of the electric equipment by predicting the power usage after the monitoring time in the second cycle that is multiple times the first cycle, the power usage in the second cycle. When the predicted value of the amount of energy is greater than the target amount of power that is the target and the actual value is greater than the elapsed time of the target amount of power, the type of load control is stopped, and the predicted value of the amount of power used in the second cycle is the target When the load control type is smaller than the power amount and the actual value is smaller than the elapsed time of the target power amount, the type of load control is started, and when the load control type by the load control determination unit is stop, use Target from predicted value of electric energy Excessive power calculated from the amount of power minus the amount of power and the remaining time of monitoring, the adjusted power is calculated by multiplying the coefficient corresponding to the preset remaining time, and stop the electrical equipment corresponding to this adjusted power, When the type of load control is start-up, load control means for starting electric equipment corresponding to adjusted electric power calculated from the amount of power obtained by subtracting the predicted value of the amount of used power from the separately set amount of return power and the remaining time of monitoring It is configured by having and.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.
In the embodiment of FIG. 1, the used power measuring means 11 and the used power amount calculating means 1 in the conventional power load control system shown in FIG. 3 are used.
2, predicted power amount calculation means 13, and graph display means 1
6, a load control determination unit 14 that determines whether the power load is stopped or restarted, a new load control unit 15, and an adjusted power coefficient table 17 and an adjusted power holding unit 18 used for the processing of the load control unit 15. Is configured.

In the above configuration, the power consumption measuring means 1
1, the used power amount calculation means 12 and the predicted power amount calculation means 13 perform the same processing as in the case of the conventional power load control method shown in FIG. 3, but the power display of the graph display means 16 is shown in FIG. As shown in, in addition to the conventional display, a preset power recovery amount 104 is displayed.

FIGS. 5 and 6 are flowcharts of the processes of the load control determination means 14 and the load control means 15 of the embodiment of FIG. 1, respectively. The operation after the process of the predicted power amount calculation means 13 of the embodiment of FIG. 1 will be described below with reference to FIGS.
And it demonstrates with reference to FIG. Predicted power calculation means 13
When, for example, the predicted power amount 114 is calculated and displayed in a graph in a 5-minute cycle, the load control determination means 14 is activated. The load control determination means 14 first checks whether the predicted power amount 114 is larger than the target power amount 103 (step 50
1) If it is large as shown in FIG. 2A, it is further checked whether the final value of the actual power line 112 is larger than the value of the target power line 111 at that time (step 502). It is stopped (step 503) and the load control means 15 is called (step 504). If it is smaller in step 502, the process ends. On the other hand, step 50
If 1 is small, it is checked whether the final value of the actual power line 112 is smaller than the value of the target power line 111 at that time (step 505). If it is small as shown in FIG. 2B, the predicted power amount 114 is further increased. It is checked whether or not it is smaller than the restored power amount 104 (step 506), and if it is smaller, the type of load control is activated (step 507) and the process proceeds to step 504. It should be noted that if each of the steps 505 and 506 is large, the process ends.

The load control determination means 14 is a load control means 15
, The load control means 15 is activated. The load control means 15 first checks the type of control set by the load control determination means 14 (step 601). If the type is stop,
Excessive power corresponding to the conventional adjusted power described in FIG. 3 = (predicted power amount−target power amount) × 30 / remaining monitoring time is calculated (step 602). Next, the coefficient corresponding to the remaining monitoring time is fetched from the adjusted power coefficient table 17 (step 603). The adjusted power coefficient table 17 is set with coefficients 0.5 to 1.0 corresponding to the remaining monitoring time. This coefficient is set to a smaller value as the remaining monitoring time is longer, and it is set so that the load is not excessively stopped in the early prediction time so that the used power amount is close to the target power amount 103. Next, the excessive power calculated in step 602 is multiplied by the coefficient extracted in step 603, and stored in the adjusted power holding means 18 as adjusted power (step 60).
4). Next, a stoppable equipment load commensurate with the adjusted electric power stored in the adjusted electric power holding means 18 is selected to stop the operation (step 605). On the other hand, if the type is activated in step 601, adjusted power = (predicted power amount−returned power amount)
× 30 / remaining monitoring time is calculated, and the adjusted power is stored in the adjusted power holding unit 18 (step 606), and the process proceeds to step 605. In step 605, since the adjusted electric power has a negative sign, the equipment load corresponding to this electric power is selected and started.

The above-mentioned processing is performed by repeating the stop control and the start control at intervals of 5 minutes within the monitoring time which is repeated in the unit of 30 minutes as an example. You will get close results.

[0011]

As described above, according to the present invention, the means for adjusting the adjusted power for stopping the equipment load from the predicted power quantity according to the remaining monitoring time, and restarting the equipment load when the predicted power quantity falls below the target power. By providing the means, it is possible to bring the amount of electric power used close to the target amount of electric power and to improve the operating efficiency of the facility.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing a display example of a graph display means of the embodiment of FIG.

FIG. 3 is a configuration diagram showing a typical example of a conventional power load control system.

FIG. 4 is a diagram showing a display example of a graph display means of the power load control system of FIG.

5 is a flow chart of a process of load control determination means of the embodiment of FIG.

FIG. 6 is a flowchart of a process of load control means of the embodiment of FIG.

[Explanation of symbols]

 11 Used Power Measuring Means 12 Used Power Amount Calculation Means 13 Predicted Electric Power Amount Calculation Means 14, 24 Load Control Judgment Means 15, 25 Load Control Means 16 Graph Display Means 17 Adjusted Power Coefficient Table 18 Adjusted Power Holding Means

Claims (1)

[Claims] 1. Used in a supervisory control system for a plurality of electric facilities installed in a building, the amount of electric power used is integrated in a first cycle within a constant monitoring time, and a plurality of times of the first cycle are used. In the power load control method that predicts the amount of power used after the monitoring time elapses in two cycles and controls the use of electrical equipment,
When the predicted value of the amount of power used in the second cycle is larger than the target amount of power that is the target and the actual value is larger than the elapsed time of the target amount of power, the type of load control is stopped, and in the second cycle When the predicted value of the amount of electric power used is smaller than the target amount of electric power and the actual value is smaller than the elapsed time of the target amount of electric power, the load control determination means that activates the type of load control, and the load control determination means When the type is stop, adjustment by multiplying the excess power calculated from the power amount obtained by subtracting the target power amount from the predicted value of power consumption and the remaining time of monitoring by a coefficient corresponding to the preset remaining time When the electric power is calculated, the electric equipment commensurate with the adjusted electric power is stopped, and the type of load control is startup, the amount of electric power obtained by subtracting the predicted value of the amount of electric power used from the reset electric energy set separately and the remaining time of monitoring Key calculated from Power load control method characterized by having a load control means for activating the electrical equipment to meet the power.