JP2003070162A - Demand control method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow implementing efficient demand control in response to a change of environment of each load, preventing a physical quantity of an object to be controlled of each load from exceeding a set value and reducing tolerance required for the demand control when a plurality of the loads is operated by the demand control. SOLUTION: A predicted demand value and an adjusted power value when a demand time limit comes are calculated based on a measured value of total electric energy of a plurality of the loads 1-5. When the power to a part of the loads is interrupted in response to the adjusted power value, an operation period meeting the set value of the physical quantity of the object to be controlled of each load of is stored at a non-demand time limit just before the demand time limit. The load to be interrupted is selected at the demand time limit based on the stored operation period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a demand control method and apparatus for controlling the amount of electric power used in a demand time period so as not to exceed the contracted electric power amount.

[0002]

2. Description of the Related Art For example, so-called demand control is performed when controlling the operation of compressors of many air conditioners. During the demand control, the predicted demand value at the end of the demand time period is calculated from the absolute value of the total power demand and the increase rate at a certain time point in a predetermined demand time period. Then, when the predicted demand value exceeds the target demand value, an alarm is output from the arithmetic processing unit to the alarm buzzer via the alarm control unit to alert the monitor to perform load control. Further, in order to make the predicted demand value less than the target demand value, some compressors are stopped so that the electric power at the end of the demand time period falls within the target demand value. The adjusted power value required for such power adjustment is calculated as follows. Adjusted power value = (predicted demand value-target demand value) x demand period length / remaining time

When the adjusted power value exceeds a predetermined power value, the arithmetic processing section outputs a cutoff signal through the load control section. The cutoff signal cuts off the power supply to the selected load.

At this time, it is necessary to select a load whose power supply should be interrupted from a plurality of loads corresponding to a predetermined adjusted power value. As this method, a priority order method, a priority cyclic method, and a cyclic method are known.

Japanese Patent Laid-Open No. 11-215700 discloses a load selection method different from the cyclic method. In this method, each operating time of each load in the demand time period is counted, and the total operating time of each load is stored. Then, the power is shut off in order from the load with the longest operation time in the predetermined demand time period, and the power is supplied in order from the load with the shortest operation time. The reason for this is that, for example, in a room where the operation time of the air conditioner compressor is long, the room should be well cooled, so even if the operation of the air conditioner is stopped by demand control, the room temperature does not rise too much,
This is because it is unlikely that the temperature will exceed the upper limit. Also,
In a room where the air conditioner is running for a short time, the room should not have cooled down too much, and the temperature exceeds the upper limit value or is close to the upper limit value, so it is necessary to turn on power to the air conditioner compressor. is there.

[0006]

However, when the present inventor examined an actual demand control facility, it was found that Japanese Patent Laid-Open No. 11-
It has been discovered that common sense judgments such as those described in Japanese Patent No. 215700 are actually erroneous and rather cause a reduction in the efficiency of demand control.

The reason for this will be described by taking an air conditioner as an example. First, what is important in demand control of a large number of air conditioners is to prevent the temperature of each room from exceeding a set value. However, Japanese Patent Laid-Open No. 11-2157
When the control is performed as described in Japanese Patent Publication No. 00-00, there is a possibility that the temperature of a part of the room may rise significantly. For example, suppose that in a building there was a relatively small room with large windows facing west. The air conditioner installed in this room is usually not so large in capacity in consideration of the size of the room. However, the intense heat of the sun may enter this room, and the amount of heat entering the room may temporarily rise significantly. In such a case, even when the air conditioner is continuously operated without stopping, the room temperature does not reach the lower limit temperature at which the switch of the air conditioner automatically stops. However, JP-A-11-2
According to the demand control method described in Japanese Patent No. 15700, since the air conditioner compressor for this room is continuously operated, the operating time is the longest. Therefore, the power supply to the room in which the operation of the air conditioner is indispensable is stopped first, and the temperature of the room rapidly rises. In this case, the person in the room makes a complaint, and the original control purpose is not achieved.

In order to prevent such a situation, it is effective to install a larger capacity air conditioner compressor in a room where the sun sets. In other words, it is necessary to set the margin of air conditioning capacity to be large.
However, if the margin is increased in this way, the power demand of the system naturally increases in an accelerating manner, so that it becomes necessary to raise the target demand value.

An object of the present invention is to enable efficient demand control according to changes in the surrounding conditions of each load when demand-controlling the operation of a plurality of loads, whereby the physical quantity to be controlled of each load is controlled. This is to make it difficult to exceed the set value and reduce the margin required for demand control.

[0010]

SUMMARY OF THE INVENTION The present invention is a method for demand-controlling the operation of a plurality of loads, the predicted demand value at the end of the demand time period and adjustment based on the measured value of the total electric energy of the plurality of loads. When calculating the power value and shutting off the power to some of the multiple loads according to the adjusted power value,
It is characterized in that the operating cycle satisfying the set value of the controlled physical quantity of each load is stored in the non-demand time period, and the load to be interrupted is selected based on the operating cycle in the demand time period.

Further, according to the present invention, the predicted demand value and the adjusted power value at the end of the demand time period are calculated on the basis of the measured values of the total power amounts of the plurality of loads, and the plurality of loads are associated with the adjusted power value. Is a method for demand-controlling a plurality of loads by cutting off power to a part of the above, and is characterized by controlling the operation of each load based on the measured value of the physical quantity to be controlled.

The present inventor, when shutting off power to a part of a plurality of loads corresponding to the adjusted power value, stores an operation cycle satisfying the set value of the controlled physical quantity of each load in the non-demand time period. Then, it was conceived to select the load to be interrupted based on the operation cycle in the demand time period.
This will be described with reference to the graph of FIG. The non-demand time period is a time period when the demand control described above is not performed. In the non-demand time period, each load performs its own control so that the controlled physical quantity falls within the set value range. Taking an air conditioner as an example, each air conditioner adjusts its temperature so that the temperature falls between an upper limit value and a lower limit value. In this state, each air conditioner compressor repeats on-off with self-temperature control. The operation cycle of the load is from the start of operation of the load to the stop of operation in this case (from the start of power supply to the interruption)
Is the time of one cycle.

Here, in the present invention, for example, as shown in FIG. 8, each load 1 in the immediately preceding non-demand time period,
2,3,4,5 operating cycles Q1, Q2, Q3, Q4,
Each Q5 is measured and stored in the storage device. Then, in the demand time period, when it is necessary to cut off the power to one or more loads according to the adjusted power value, the power to the load with the shortest operation cycle is cut off from the loads being operated at that time. To do.

The operation and effect of this control system will be described by taking an air conditioner compressor as an example. In FIG.
The operation cycle increases in the order of Q1, Q2, Q3, Q4, Q5. In the non-demand time period, the operation of each compressor is not subjected to the forced shutoff based on the adjusted power value. Therefore, the operation of each compressor should be turned on and off based on the temperature adjustment function of each air conditioner. Here, it is assumed that the amount of heat incident on the room has increased for some reason. In this case, although the capacity of the air conditioner in the room is constant, the capacity required to maintain the room at the set temperature or lower becomes large, so that the room becomes difficult to cool by the air conditioner. Therefore, the compressor is unlikely to be in the cutoff state, and the operation cycle should be long. That is, generally speaking, the fact that the load operation cycle in the non-demand time period is relatively long means that the work amount for maintaining the controlled physical quantity within the set range is relatively excessive with respect to the load capacity. It means that.

Even during demand control, there should be relatively little change in the surrounding conditions during the immediately preceding non-demand time period. Therefore, the load having a short operation cycle should mean that the work amount for maintaining the controlled physical quantity in the set range is small. Even if power to such a load is temporarily cut off, the next time the switch is turned on, the necessary work will be performed immediately, so it is unlikely that the physical quantity to be controlled will exceed the set value, and at least it will greatly exceed it. It's low. On the other hand, for loads with a relatively long operation cycle, once the physical quantity to be controlled falls outside the set range, it should be relatively difficult to return it to the set range. And by this,
Efficient demand control can be performed according to changes in the surrounding conditions of each load, and the physical quantity to be controlled corresponding to each load is less likely to fall outside the set range.

Such a control method is disclosed in JP-A-11-215.
It differs from the control method described in Japanese Patent Publication No. 700 in that (1) the operation cycle is measured in a non-demand time period,
And (2) they are different in that they are sequentially shut off from a load having a short operating cycle.

In the present invention, the operation cycle data is not detected during the demand period. This is because during the demand time period, depending on the adjusted power value, the power supply to each load may be cut off independently of the automatic power cut-off function of each load itself. Therefore, even if the time for one cycle from the time when power is applied to the load to the time when power is cut off is measured, it is automatically cut off by each load itself.
This is because the operation cycle is not based on the closing function.

Further, in the present invention, the operation cycle is measured and stored in the non-demand time period. As a result, it is possible to immediately respond to changes in the load condition, and efficient control is possible. Here, particularly preferably, the interval between the target demand time period and the non-demand time period in which the operation cycle is measured is preferably 3 time periods or less. Particularly preferably, the operation cycle of each load is measured in the non-demand time period immediately before the target demand time period.

Further, the inventor of the present invention has conceived to provide a control target physical quantity measuring device corresponding to each load and control the operation of each load based on each measured value of the control target physical amount in each device. That is, by measuring the surrounding physical quantity of the controlled object corresponding to each load, when the controlled physical quantity is out of the set range, power can be preferentially applied to the corresponding load.

Conventionally, in the non-demand time period, ON / OFF is individually selected for each load according to the physical quantity to be controlled. However, at the time of demand control, collecting and monitoring each control target physical quantity from each load, and regarding the load where the control target physical quantity is outside the setting range,
It is not known to preferentially turn on power regardless of other demand control.

The type of load is not particularly limited, and may be any load such as a compressor of an air conditioner, pumps such as a cooling medium circulation pump of an air conditioner, and an air compressor. Further, the controlled physical quantity may be any physical quantity that is affected by the work due to the load. For example, it may be temperature, pressure, flow rate of fluid medium, pressure of fluid medium.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, during demand control, it is preferable to cut off electric power from a load during operation to a load having a relatively short operation cycle. At this time, the power to the load having an operating cycle shorter than the average value of the operating cycle of the operating load may be cut off. Particularly preferably, the electric power is cut off from the load during operation to the load with the shortest operation cycle.

In the preferred embodiment, power supply to the load is started based on the measured value of the controlled physical quantity for each load during the demand period. For example, when the physical quantity to be controlled falls outside the range of the set value, or when it approaches the limit of the set value, power supply to the load is started and work by the load is started.

In the present invention, a predetermined weight is assigned to each load and the adjusted power value so that the total value of the weights corresponding to the loads whose power is cut off is equal to or greater than the weight corresponding to the adjusted power value. You can control. That is, it is assumed that the adjusted power value is calculated in a certain demand time period and the power to some of the plurality of loads is cut off. After that, if it is detected that the physical quantity to be controlled falls outside the set value range for a certain load and power is applied to that load, it is necessary to cut off the power to one or more other loads. . The predicted demand value cannot be brought close to the target demand value unless control is performed so that the total value of the weights of the loads being cut off is equal to or greater than the weight corresponding to the adjusted power value.

Therefore, a predetermined weight is assigned to each load in advance. It is necessary to associate each weight with the capacity of each corresponding load. For example, capacity 15-
The load of 25 kW has a weight of 1, and the load of the capacity of 30 to 50 kW has a weight of 2.

Further, an approximate weight corresponding to the adjusted power value is calculated. Then, the number of loads to be cut off is selected so that the total value of the weights of all the loads being cut off is equal to or greater than the weight corresponding to the adjusted power value. For example, when the weight corresponding to the adjusted power value is set to 3, the load of weight 1 is cut off three, the load of weight 2 and the load of weight 1 are cut off, or the load of weight 3 is changed. Cut off one.

The present invention will be described in more detail below with reference to the drawings. FIG. 1 is a block diagram schematically showing a demand control device according to one embodiment, and FIG. 2 is a block diagram showing a connection form of each load and other components, and FIGS.
FIG. 7 is a flowchart showing a demand control method according to one embodiment, and FIG. 8 is a graph showing an example of the on / off state of each load.

The main part of this device is the demand control circuit 1.
The load control circuit 2, the loads 1 to 5, and the power measuring device 20. The demand control circuit 1 includes an input control unit 3, a time limit unit 4, a set value input unit 5, an arithmetic processing unit 6, a storage unit 7, an output control unit 8, and an alarm control unit 9. The storage device 7 includes storage elements such as a ROM and a RAM. Each alarm 10 is connected to the alarm controller 9. The load control circuit 2 includes an input control unit 11, a time limit unit 12, a set value input unit 13, an arithmetic processing unit 14, a storage unit 15, and an output control unit 1.
6, a load control unit 17, an operating time measuring device 18, and an operating state monitoring unit 19.

The operation of this device will be described. First, the load control circuit 2 monitors each operating state of each load 1 to 5 through the monitoring unit 19. In addition, each load 1 to 5 is a switch 2
3 is connected to the load control unit 17 through the control unit 1
It is possible to select whether to turn on or off the power to each load through 7. Electric power is supplied to each load through a power line 21, and the total value of the demanded power is the power measurement device 20.
Is being measured by.

As shown in FIG. 3, it is first determined whether or not the demand time limit is met (S2). In the non-demand time period, the process proceeds to the load operation cycle detection step (S4). In the demand time limit, the load demand control step is entered (S6).

When the operation cycle detecting step (S4) is entered, as shown in FIG. 1, FIG. 2 and FIG.
From the arrow signals E1, E2, E3, E
4 and E5 are sent to the operation state monitoring unit 19. Thereby, the operating condition monitoring unit 19 monitors each operating condition of each load 1 to 5, measures the operating time of each load, and sends the operating time data of each load from the measuring device 18 to the input control unit 11 ( S8). This data is processed by the arithmetic processing unit 14 to calculate the operation cycle of each load (S10). Then, the operation cycle of each load is stored in the storage device 15 (S
12). For example, in the example of FIG. 8, in the non-demand time period, the operation cycles of the loads 1 to 5 are Q1, Q2, and Q.
It is 3, Q4, Q5. The operation cycle increases from the load 1 to the load 5.

When the demand time limit is entered, as shown in FIG. 5, first, it is detected whether or not there is a load in which the physical quantity to be controlled falls outside the set value range (S14). In this case,
As shown in FIG. 2, measuring devices 24A, 24B, 24C, and 24 of the physical quantities to be controlled respectively correspond to loads 1 to 5.
Install D and 24E. Then, the measured values of the respective measuring devices are sent to the input control unit 11 as indicated by arrows D1, D2, D3, D4 and D5. The input measured value is compared with the set value previously input from the set value input unit 13.

Here, for example, when the ambient temperature of the load exceeds the upper limit value, power is immediately applied to the load (S16). On the other hand, if there is no load in which the physical quantity to be controlled is out of the set value range, calculation of the predicted demand value is started (S18). At this time, the total electric energy of the loads 1 to 5 is measured by the electric power measuring device 20, and the electric power measuring device 2
Information on the total amount of electric power is transmitted from 0 to the input control unit 3 as indicated by arrow A. This information is sent to the arithmetic processing unit 6 to calculate the predicted demand value. Then, the predicted demand value and the target demand value are compared. When the predicted demand value exceeds the target demand value (S20), the load shedding step is entered (S22). When the target demand value exceeds the predicted demand value (S24), the step of supplying power to the load is started (S26).

When the predicted demand value exceeds the target demand value, a signal is sent from the output control unit 8 to the alarm control unit 9 as indicated by arrow B, the alarm 10 is activated, and the manager is notified. Along with this, the output control unit 8 to the input control unit 11
A signal is sent to the arrow mark as indicated by arrow C to operate the load control circuit.

FIG. 6 is a flow chart showing the flow of the load shedding step. First, the load with the longest operation cycle is selected from the loads during operation (S28). For example, in FIG.
In the example, loads 1, 2, and 3 are in operation when the demand control is started. Next, when selecting the load to be cut off, the operation cycle of each load in the immediately preceding non-demand time period is referred to. At this time, in FIG. 1, the data of the adjusted power value is transmitted from the output control unit 8 to the input control unit 11 and then to the arithmetic processing unit 14. In addition, from the storage device 15, the operation cycle Q1, Q2, Q3, Q4, Q5
Of the data is sent to the arithmetic processing unit 14. In the device 14, the load 1 having the minimum operation cycle (Q1) is selected from the loads 1, 2, and 3 in operation (S28).

Here, when the physical quantity to be controlled is outside the range of the set value for the selected load, it is necessary to continue supplying power to this load. Therefore, the load 1 is excluded from the selection (S32), and the load selection step is performed again (S28). In this case, the load 2 having the minimum operation cycle (Q2) is selected from the loads 2 and 3, and the process proceeds to step S30. On the other hand, for the selected load 1,
If the physical quantity to be controlled is within the range of the set value, the power to the selected load 1 is cut off (S34). That is, a signal indicating that the load 1 is selected as the load to be shut off is sent to the output control unit 16 and the load control unit 17, and a signal is sent as at F1 to shut off the switch 23.

As shown in FIG. 8, for example, at time t1, the power to the load 1 is cut off and the power to the load 4 is started. Here, if the total value of the weights of all the loads being cut off is equal to or larger than the weight corresponding to the adjusted power value (S36), the load cutoff step is ended. If the total value of the weights of all the loads that are being cut off is less than the weight corresponding to the adjusted power value, it is necessary to additionally cut off the load, so the load selection step (S2
Return to 8).

On the other hand, when the target demand value exceeds the predicted demand value, it means that there is a margin to supply power to one or more loads. Therefore, as shown in FIG. 7, the process proceeds to the load application step. In the load applying step, according to the present invention, the load to be applied with power is selected based on the measured value of the controlled physical quantity.

Specifically, in the arithmetic processing unit 14,
The measured values transmitted from the measuring devices 24A to 24E for each load are compared with the set values (S38). When there is a load whose physical quantity to be controlled exceeds the set value, the output control unit 16 and the load control unit 17 select F1, F2, F3, and F4.
Alternatively, a signal is sent as in F5 to turn on the switch 23 corresponding to the load (S46).

On the other hand, when there is no load in which the controlled physical quantity exceeds the set value, the load having the smallest difference between the controlled physical quantity and the set value is selected from the loads being cut off (S).
40). The smaller the difference between the controlled physical quantity and the set value,
This is because it means that it is highly necessary to input power to the load.

Next, in the arithmetic processing unit 14, it is judged whether or not the total value of the weights of the interrupting loads when the selected load is turned on is equal to or more than the weight corresponding to the adjusted power value (S42). When the total value of the weights of the loads during interruption when the power is applied to the selected load is equal to or greater than the weight corresponding to the adjusted power value, the power is applied to this load (S46). When the total value of the weights of the loads during cutoff when the power is applied to the selected load is less than the weight corresponding to the adjusted power value, this load is deselected (S44). Next, a load having the smallest difference between the controlled object physical quantity and the set value is selected from the remaining loads being cut off (S40).

FIG. 8 schematically illustrates a timing chart of turning on and off the power of the load according to the control method of the present invention. In the non-demand time period, each load 1 to 5 as described above
Of each operating cycle Q1, Q2, Q3, Q4, Q5,
It is stored in the storage device 15. At the time of entering the demand time limit, the loads 1, 2, and 3 are operating like T1, T2, and T3, and the loads 4 and 5 are shutting off power. At time t1, as described above, the power to the load 1 having the minimum operation period Q1 is cut off, and the load 4 or 5 is removed.
Power is applied to (for example, load 4) (T4). Then
At time t2, electric power is applied to the load 5, and the operating cycle is the minimum value Q2 among the operating loads 2, 3, and 4.
Then, the load 2 is selected and the power is cut off. Next, at time t3, assuming that the physical quantity to be controlled exceeds the set value in the load 1, for example, power is applied to the load 1. At the same time, the power to the load 3 whose operating period is the minimum value Q3 is cut off from the loads 3, 4, and 5 during operation.

Next, it is assumed that power is applied to the load 2 at time t4. At time t4, the loads being operated are the loads 1, 4, and 5, so normally, the load 1 having the minimum operation period Q1 is cut off. However, if the controlled object physical quantity for the load 1 still exceeds the set value at this point, the operation of the load 1 is continued. In this state, the operation of the loads 1, 2, 4, 5 will continue.

At this point, the load 3 being cut off
If the weight of is greater than or equal to the weight corresponding to the adjusted power value, the operation of the loads 1, 2, 4, 5 is continued as it is. However, when the weight of the load 3 being cut off is less than the weight corresponding to the adjusted power value, the load cutoff capacity becomes insufficient. Therefore, it is necessary to cut off one or both of the loads 4 and 5. At this time, normally, at time t4, the load 4 having the minimum operation period Q4 is cut off from the loads 4, 5 (load 1 is excluded from the selection) being operated.

After this, the operation of loads 1, 2, and 5 is started at time t.
Continue until 5. At time t5, for example, power is applied to the load 3. Here, when the weight of the load 4 being cut off becomes less than the weight of the adjusted power value, it is necessary to cut off one or more of the loads 1, 2, and 5. At this point, normally, the load 1, which has the minimum value Q1 among the loads 1, 2, and 5 in the operation cycle, is cut off.

In the above-described embodiment, the so-called cyclic control system is adopted in selecting the load to be cut off in accordance with the adjusted power value in the demand control time period. However, the cyclic control method may not be adopted in the demand control time period. In this case, at the stage of entering the demand control time limit, one or a plurality of loads are cut off in accordance with the "weight" of the adjusted power value. At this time, as described above, the loads are shut off in order from the load having the shortest operating cycle in the immediately preceding non-demand time period. Then, in principle, the same load is continuously cut off until the demand time period ends.

However, in the demand time limit, when it is detected that the physical quantity to be controlled is out of the set range for the interrupted load, electric power is applied to the load. However, if the condition of the weight corresponding to the adjusted power cannot be satisfied by turning on the power to this load, one or more loads that are being turned on must be cut off. At this time, the load having the shortest operation cycle in the immediately preceding non-demand time period is cut off from the loads being turned on.

FIG. 9 shows a timing chart according to this embodiment. The control method and the flowchart in this embodiment are basically the same as those in the above-described embodiments. However, in the present embodiment, the cyclic control method is not adopted during the demand time limit.

First, in the non-demand time period, as described above, each operating cycle Q1, Q2, Q3 of each load 1 to 5 is
Q4 and Q5 are measured and stored in the storage device 15. Here, for example, when the predicted demand warning (single-stage warning) is issued at time t6, the load enough to satisfy the weight corresponding to the adjusted power value is cut off. At this time, the load is cut off by using the contact that operates in response to the predicted demand alarm. When selecting the load to be interrupted, interrupt the load in order from the load with the shortest operating cycle. In the example of FIG. 9, the magnitude of the operation cycle is Q5, Q4, Q3, Q2, Q1 in this order. Therefore, the load 1, which has a relatively short operating cycle,
2 and 3 are cut off, and the operation of loads 4 and 5 having a long operation cycle is continued (T7, T8). After this, as a general rule, the interruption of the loads 1, 2, and 3 is continued until the demand time period ends (until t9). Then, at the time point t9, when the predicted demand alarm is released, the loads 1, 2, and 3 that have been cut off are released.
To resume power supply to.

However, the physical quantity to be controlled may fall outside the set value range for any of the loads 1, 2, and 3 during interruption. For example, at time t7, when it is detected that the physical quantity to be controlled corresponding to the load 3 is out of the set range, power supply to the load 3 is immediately started (T6). However, if this is left as it is, the loads 1, 2, 3, and 4 will continue to operate, and the adjusted power value condition cannot be satisfied.
Therefore, it is necessary to cut off the load 4 or 5 at time t7. . At this time, the operating cycle Q4 is shorter than Q5, so it is preferable to interrupt the load 4. In addition,
In this example, the load 5 is automatically stopped by self-control (for example, self-temperature control) at time t8.

[0051]

As described above, according to the present invention, when the demand control of the operation of the plurality of loads is performed, the demand control can be efficiently performed according to the change of the surrounding condition of each load. This makes it difficult for the physical quantity to be controlled of each load to exceed the set value, and the margin required for demand control can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing a configuration of a demand control device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a connection relationship between each load 1 to 5 and each external component.

FIG. 3 is a flowchart showing a selection process of a load demand control step and an operation cycle detection step.

FIG. 4 is a flowchart showing a procedure of a load operation cycle detection step.

FIG. 5 is a flowchart showing a control procedure in a demand time limit.

FIG. 6 is a flowchart showing a procedure of a load shedding step.

FIG. 7 is a flowchart showing a procedure of a load applying step.

FIG. 8 is an example of a timing chart of power cutoff and turn-on of each load in the non-demand time period and the demand time period.

FIG. 9 is another example of a timing chart of power cutoff and turn-on of each load in the non-demand time period and the demand time period.

[Explanation of symbols]

1 Demand control circuit 2 Load control circuit
3, 11 Input control unit 4, 12 Time limit unit
5, 13 set value input unit 6, 14 arithmetic processing device 7, 15 storage device
8, 16 Output control unit 17 Load control unit
18 Driving time measuring device 19 Operating state monitoring unit 20 Electric power measuring device
21 power supply line 23 switch for each load 24A, 24B, 24
C, 24D, 24E control target physical quantity measuring device
A Flow of electric power measurement data C Demand control signal D1, D2, D3, D4, D5 Flow of control target physical quantity measurement data from each control target physical quantity measuring device E1, E2, E3, E4, E5 Operating state of each load Data flow F1, F2, F3, F4,
F5 switch control signals Q1, Q2, Q3,
Operation cycle of load in non-demand time period immediately before Q4 and Q5

Claims (20)

[Claims] 1. A method for demand-controlling the operation of a plurality of loads, wherein a predicted demand value and a regulated power value at the end of a demand time period are calculated on the basis of measured values of the total amount of electric power of the plurality of loads. When shutting off the power to a part of the plurality of loads corresponding to the adjusted power value, the operation cycle that satisfies the set value of the control target physical quantity of each load in the non-demand time period is stored, and in the demand time period. A demand control method, characterized in that the load to be interrupted is selected based on the operation cycle. 2. The method according to claim 1, further comprising: cutting off electric power from the operating load to the load having the shortest operating cycle during the demand time period. 3. The operation of the load is controlled based on the measured value of the controlled physical quantity for each of the loads during the demand time period.
The method described. 4. The method according to claim 3, wherein in the demand time period, power supply to the load is started based on a measured value of the controlled physical quantity for each of the loads. 5. A predicted demand value and a regulated power value at the end of the demand time period are calculated based on the measured values of the total power amounts of the plurality of loads, and a part of the plurality of loads is calculated corresponding to the regulated power value. Is a method of demand-controlling a plurality of loads by cutting off the power of the load, wherein the operation of each load is controlled based on the measured value of the physical quantity to be controlled of the load. 6. The method according to claim 5, wherein in the demand time period, power supply to the load is started based on a measured value of the controlled physical quantity for each of the loads. 7. The operation cycle of each load satisfying the set value of the controlled physical quantity in the non-demand time period is stored, and the load to be interrupted is selected based on the operation cycle in the demand time period. Characterized by,
The method according to claim 5 or 6. 8. The method according to claim 7, wherein in the demand time period, the electric power is shut off from the load being operated to the load having the shortest operation cycle. 9. A predetermined weight is assigned to each of the loads and the adjusted power value so that the total value of the weights corresponding to the loads whose power is cut off is equal to or greater than the weight corresponding to the adjusted power value. The method according to any one of claims 1 to 8, characterized in that 10. The load is an air conditioner load, and the controlled physical quantity is temperature.
10. A method according to any one of claims 9 to 10. 11. An apparatus for demand-controlling the operation of a plurality of loads, a power measuring apparatus for measuring the total amount of electric power of the plurality of loads and transmitting the measured value, and a demand time period end based on the measured value. Device for calculating the predicted demand value and adjusted power value at time, a load control unit for controlling the operation of each load, and an operation for measuring an operation cycle satisfying the set value of the controlled physical quantity of each load in the non-demand time period A time measurement device and an operation cycle storage device that stores each operation cycle of each load are provided, and the load control unit corresponds to a part of the plurality of loads in response to the adjusted power value in the demand time period. When shutting off the power,
A demand control device, wherein the load to be interrupted is selected based on each operation cycle of each load stored in the operation cycle storage device. 12. The device according to claim 11, wherein power is shut off from the load during operation to the load with the shortest operation cycle during the demand time period. 13. A physical quantity measuring means for measuring the controlled physical quantity for each of the loads is provided, and the operation of each of the loads is controlled based on each measured value of the physical quantity measuring means. The device according to claim 11 or 12. 14. The power supply to the load is started based on the measured value of the control target physical quantity for each of the loads in the demand time period.
The device according to 3. 15. A power measuring device for measuring the total amount of electric power of a plurality of loads and transmitting the measured value, an arithmetic device for calculating a predicted demand value and a regulated electric power value at the end of the demand time period based on the measured value, A load control unit that controls the operation of each load, and a physical quantity measuring unit that measures the control target physical quantity for each load are provided, and the operation of each load is performed based on each measured value in this physical quantity measuring unit. A demand control device characterized by controlling. 16. The power supply to the load is started based on the measured value of the control target physical quantity for each of the loads in the demand time period.
5. The device according to 5. 17. A driving time measuring device for measuring a driving period that satisfies a set value of a controlled physical quantity of each load in a non-demand time period, and a driving period storage device for storing each driving period of each load. Therefore, when the load control unit cuts off power to a part of the plurality of loads in the demand time period corresponding to the adjusted power value, each operation of each load stored in the operation cycle storage device is performed. 17. Device according to claim 15 or 16, characterized in that the load to be cut off is selected based on a cycle. 18. The apparatus according to claim 17, wherein in the demand time period, the electric power from the load being operated to the load having the shortest operation cycle is cut off. 19. A predetermined weight is assigned to each of the loads and the adjusted power value so that the total value of the weights corresponding to the loads whose power is cut off is equal to or greater than the weight corresponding to the adjusted power value. The device according to any one of claims 11 to 18, characterized in that it is controlled by 20. The apparatus according to claim 11, wherein the load is a load of an air conditioner, and the controlled physical quantity is a temperature.