JP6368673B2 - Demand control method and demand control apparatus - Google Patents

Description

  Embodiments described herein relate generally to a demand control method and a demand control apparatus that match a target power with a target power as much as possible without exceeding the target power at the end of the demand time limit.

  The demand control device obtains power that must be adjusted to match the target power at the end of the demand time limit (30 minutes), so-called adjustment power within the demand time limit. When a predetermined cut-off power is reached, the power adjustment load included in the control target load is stopped or cut off to reduce power consumption. An air conditioner is often used as a load for adjusting power. The cutoff power is set to the same value as the adjustable power of the power adjustment load.

  The adjusted power will be described with reference to FIG. The adjustment power required at time t2 within the demand time limit is F. This adjusted power F includes the power consumption G of the demand control target load 30 minutes later when the power consumption C of the demand control target load at time t2 is maintained and the use of the demand control target load at time t2. This is a difference from the power consumption H of the load subject to demand control after 30 minutes, which is expected when the power is used in a state of passing from the power C to the target power A at the end of the demand time limit. That is, the adjusted power F is an amount indicating how much power is adjusted (reduced) from the current used power C and the used power at the end of the demand time period reaches the target power A. B is the power consumption at the end of the demand time period that is expected when the power consumption C of the demand control target load at time t2 is maintained as it is. E is a cut-off power.

Japanese Patent Laid-Open No. 11-215700 Japanese Patent Laid-Open No. 3-15229

  In the demand control, the cutoff power is fixed. For this reason, when the adjusted power reaches the cutoff power and the adjusted power is reduced from the power consumption of the power adjustment load, the power used by the demand control target load increases for some reason and the adjusted power is cut off again. Even if the power is reached, there is a possibility that the adjusted power cannot be reduced from the power consumption of the power adjustment load. In this case, the power used cannot be matched with the target power at the end of the demand time limit.

  The object of the embodiment of the present invention is to ensure that the power used by the load subject to demand control coincides with the target power at the end of the demand time period, and when using an air conditioner as the power adjustment load, the comfort is improved. A demand control method and a demand control apparatus are provided.

The demand control method according to claim 1 controls the power consumption of a power adjustment load having a variable power consumption included in the demand control target load to be a set value, and sequentially detects the power used by the demand control target load. The power to be adjusted in order to match the power used by the demand control target load with the target power at the end of the demand time limit is obtained from the detected used power and the target power, and the obtained power for adjustment is the setting When the threshold value smaller than the threshold value is reached, the set value is reduced by the adjustment power, and when the calculated adjustment power reaches the reduced set value, the power adjustment load is stopped. .

The demand control apparatus according to claim 4 includes first control means, detection means, calculation means, and second control means. The first control means controls the power consumption of the power adjustment load whose power consumption included in the demand control target load is variable to a set value. The detecting means sequentially detects power used by the demand control target load. The calculation means obtains the power that must be adjusted in order to make the power consumption of the demand control target load coincide with the target power at the end of the demand time limit from the power consumption detected by the detection means and the target power. The second control means reduces the set value by the adjustment power when the adjustment power obtained by the computing means reaches a threshold value smaller than the set value, and the obtained adjustment power When the set value is reduced , the load for power adjustment is stopped.

  According to the demand control method of claim 1, the power used by the demand control target load can be surely matched with the target power at the end of the demand time period, and when the air conditioner is used as the power adjustment load, the comfort can be improved. Improvement can be achieved.

  According to the demand control device of claim 4, the power used by the demand control target load can be surely matched with the target power at the end of the demand time period, and when the air conditioner is used as the power adjustment load, the comfort can be improved. Improvement can be achieved.

The block diagram of the demand control apparatus of 1st Embodiment. The flowchart which shows the control which the demand control apparatus of 1st Embodiment performs. The figure which shows the relationship between the adjustment electric power and interruption electric power in 1st Embodiment. The figure which shows the time slot | zone which prohibits the reduction correction of the setting value in 2nd Embodiment. The block diagram of the demand control apparatus of 3rd Embodiment. The figure which shows a mode that interruption electric power becomes small by the part of the air-conditioning capability of the air conditioner excluded from the load for electric power adjustment in 3rd Embodiment. The figure for demonstrating the conventional demand control.

[1] First embodiment
In FIG. 1, a demand control target load 1 is a load that is installed in, for example, an office building and consumes power, and a plurality of load adjustment air conditioners 2a, 2b, 2c, 2d used as power adjustment loads, and It includes non-regulated loads 3a, 3b, 3c, 3d, etc., which are non-power adjustment loads such as lighting equipment, elevators, hot water supply equipment, office equipment and the like.

  The load adjusting air conditioners 2a, 2b, 2c, and 2d are equipped with an inverter and a compressor that operates according to the output of the inverter, and the output frequency of the inverter is controlled by a demand control device 10 to be described later. Power consumption changes.

  An electricity meter 4 is connected to the demand control target load 1. The watt hour meter 4 outputs a number of pulse signals proportional to the power used by the demand control target load 1 as a whole. This output signal is supplied to the demand control device 10.

  The demand control device 10 includes a power control unit (first control unit) 11, a power detection unit 12, a target power storage unit 13, an adjusted power calculation unit (calculation unit) 14, a cut-off power storage unit 15, and a comparison determination unit (second Control means) 16, a set value storage section 17, and a set value correction section (second control means) 18.

  The power control unit 11 controls the operation / stop of the load adjustment air conditioners 2a, 2b, 2c, 2d in accordance with a command from the comparison determination unit 16, and the load adjustment air conditioners 2a, 2b, 2c, The air conditioning capability (output frequency of each inverter) of the load adjustment air conditioners 2a, 2b, 2c, 2d is controlled so that the total value of the power consumption P of 2d becomes constant at the set value Ps in the set value storage unit 17. . In addition, since the air conditioning capability of the load adjusting air conditioners 2a, 2b, 2c, and 2d and the power consumption thereof are substantially proportional, if the air conditioning capability, that is, the output frequency of the inverter is determined, each load adjusting air conditioner 2a. , 2b, 2c, 2d can be calculated.

  The power detection unit 12 integrates the pulse signals supplied from the watt hour meter 4 to sequentially detect the used power C consumed every moment in the demand control target load 1 within the demand time limit (30 minutes) Δtd. . The electric power C used here is the average electric power used for 30 minutes when the electric power company determines the electricity charge in the case of receiving 500 kW high voltage. For example, the power consumption C at the time t1 within the demand time limit Δtd is C = Wprs / Δtd, where Wprs is the amount of power from the start of the demand time limit to the time t1. The power amount Wprs is Wprs = wp × ρprs, where ρprs is the integrated value of the pulse signal from the start of the demand time limit to the time point t1, and wp is the power amount weight per pulse signal. That is, C = wp × ρprs / Δtd.

  The target power storage unit 13 stores a target power (also referred to as a demand target value) A for demand control. The target power A data is input to the target power storage unit 13 by a maintenance worker or a user.

The adjusted power calculation unit 14 uses the power C detected by the power detection unit 12, the target power A in the target power storage unit 13, the demand time limit Δtd, and the elapsed time tpres from the start of the demand time limit (1) By this calculation, power (adjustment power) that must be adjusted in order to make the power C used by the demand control target load 1 coincide with the target power A at the end of the demand time limit, so-called adjustment power F is obtained for each unit time.
F = Δtd × C / (Δtd−tpres) −Δtd × A / (Δtd−tpres)
= Δtd × (C−A) / (Δtd−tpres) (1)
The cutoff power storage unit 15 stores the set value Ps stored in the set value storage unit 17 as the cutoff power E. As will be described later, since the set value Ps stored in the set value storage unit 17 is updated in a timely manner, when the set value Ps is updated, the cutoff power E in the cutoff power storage unit 15 is also updated to the same value. Remembered.

  The comparison determination unit 16 instructs the set value correction unit 18 that the power reduction corresponding to the adjustment power F is necessary when the adjustment power F obtained by the adjustment power calculation unit 14 reaches a predetermined threshold I. To do.

  As the threshold I, a value smaller than the cutoff power E stored in the cutoff power storage unit 15 in advance, specifically, a value of about 40% of the initial cutoff power E is selected. When the threshold value I is increased, the time until the final load adjusting air conditioners 2a, 2b, 2c, and 2d are cut off is shortened. Therefore, it is preferable to set the threshold I to less than 60% of the initial cut-off power E. . Preferably, a value between 25% and 50% of the initial cut-off power E may be selected.

  Further, when the adjustment power F obtained by the adjustment power calculation unit 14 reaches the cut-off power E in the cut-off power storage unit 15, the comparison determination unit 16 sends a cut-off command (load adjustment air) to the power control unit 11. A command for stopping the conditioners 2a, 2b, 2c, 2d).

When the setting value correction unit 18 receives a setting value reduction instruction for the adjustment power F from the comparison determination unit 16, the setting value correction unit 18 corrects the setting value Ps in the setting value storage unit 17 in the reduction direction by the adjustment power F. The value (Ps−F) is updated and stored in the set value storage unit 17 as a new set value Ps. The cutoff power storage unit 15 stores the set value Ps stored in the set value storage unit 17 as the cutoff power E. As will be described later, since the set value Ps stored in the set value storage unit 17 is updated in a timely manner, when the set value Ps is updated, the cutoff power E of the cutoff power storage unit 15 is also updated and stored. .
The above operation is repeated for each demand period.

Next, the control executed by the demand control device 10 will be described with reference to the flowchart of FIG.
The demand control apparatus 10 loads the air conditioners 2a, 2b, 2c, 2d for load adjustment so that the total value of the power consumption P of the air conditioners 2a, 2b, 2c, 2d for load adjustment becomes constant at the set value Ps. The air conditioning capability (output frequency of each inverter) is controlled (step S1). Further, the demand control device 10 integrates the pulse signals supplied from the watt hour meter 4 to sequentially detect the power consumption C of the demand control target load 1 within the demand time limit (30 minutes) Δtd (step S2). ). Then, the demand control device 10 calculates the adjusted power F by the calculation of the above formula (1) using the detected used power C, target power (demand target power) A, demand time limit Δtd, and elapsed time tp from the start of the demand time limit. For each unit time (step S3).
Subsequently, the demand control device 10 cuts off the adjusted power F and the calculated power on condition that at least one of the load adjustment air conditioners 2a, 2b, 2c, 2d is not thermo-off (NO in step S4). The electric power E is compared (step S5). When the adjusted power F is less than the cutoff power E (NO in step S5), the demand control device 10 determines whether or not the adjusted power F has reached the threshold value I (step S6). The threshold value I is a value obtained by multiplying the initial cut-off power E by 40% of a predetermined ratio.

  If the adjusted power F has not reached the threshold value I (NO in step S6), the demand control device 10 monitors the end of the demand time limit (step S7). When the demand time limit still remains (NO in step S7), the demand control device 10 shifts to the constant power consumption control in step S1.

  When the adjusted power F has reached the threshold value I (YES in step S6), the demand control device 10 sets the set value Ps (same as the initial cutoff power E) to the adjusted power F (same as the threshold value I; the initial cutoff power). (Step S9). Then, the demand control device 10 determines the set value Ps after reduction (reduced to a value of 60% of the initial cutoff power E) as a new cutoff power E (step S10), and monitors the end of the demand time limit (step S10). S7). When the demand time limit still remains (NO in step S7), the demand control device 10 shifts to the constant power consumption control in step S1.

  In the constant power consumption control in step S1, the total value of the power consumption P of the load adjusting air conditioners 2a, 2b, 2c, 2d is controlled to be a new set value Ps. Since the new set value Ps is a value obtained by reducing the adjustment power F, as a result, the adjustment power F is reduced from the power consumption P of the load adjustment air conditioners 2a, 2b, 2c, and 2d.

  When the process from step S1 is repeated and the adjustment power F reaches the threshold value I again (YES in step S6), the demand control device 10 decreases to the set value Ps (60% of the initial cut-off power E). Is reduced by the adjustment power F (40% of the initial cut-off power E) (step S9). Then, the demand control device 10 determines the set value Ps after reduction (reduced to a value of 20% of the initial cutoff power E) as a new cutoff power E (step S10), and monitors the end of the demand time limit (step S10). S7). When the demand time limit still remains (NO in step S7), the demand control device 10 shifts to the constant power consumption control in step S1.

  The cutoff power E used in the subsequent processing is reduced to a value of 20% of the initial cutoff power E, and is smaller than the threshold value I (a value of 40% of the initial cutoff power E). Therefore, the determination result in the subsequent step S6 is NO, and the processes in steps S9 and S10 are not executed.

  Thereafter, when the demand time period ends (YES in step S7), the demand control device 10 returns the set value Ps and the cutoff power E to the initial values to prepare for the next demand time period (step S8), and the consumption of step S1. Shift to constant power control.

  When the adjustment power F reaches the cut-off power E in the determination in step S5 (YES in step S5), the demand control device 10 performs all operations of the load adjustment air conditioners 2a, 2b, 2c, and 2d. The operation is stopped (step S11), and the power consumption of the load adjusting air conditioners 2a, 2b, 2c, 2d is made zero. Then, the demand control device 10 monitors the end of the demand time limit (step S12). When the demand period ends (YES in step S12), the demand control device 10 returns to the constant power consumption control in step S1.

  When the adjustment power F is reduced from the power consumption P of the load adjustment air conditioners 2a, 2b, 2c, 2d, the adjustable power of the subsequent load adjustment air conditioners 2a, 2b, 2c, 2d decreases. However, since the cut-off power E (new set value Ps) also decreases by the decrease, the power consumption C of the demand control target load 1 increases within the same demand time period, and the adjustment power F obtained at that time is Even in a situation where the cut-off power E is reached, the adjustment power F can be reduced from the power consumption P of the load adjustment air conditioners 2a, 2b, 2c, and 2d. Therefore, the power consumption C of the demand control target load 1 can be reliably matched with the target power A at the end of the demand time limit. Reliable demand control is possible.

  In the above-described embodiment, the threshold value I in the comparison determination unit 16 is set to a value obtained by multiplying the initial cut-off power E by 40% of the predetermined ratio. Therefore, the set value Ps can be changed up to twice. Here, if the threshold I is set to a value obtained by multiplying the initial cut-off power E by 50%, the set value Ps is changed only once.

  It is also conceivable to set the threshold value I in the comparison / determination unit 16 to a value obtained by multiplying the cutoff power E (= set value Ps) at that time by a predetermined ratio (≦ 100%), for example, 50%. In this case, the setting value Ps = the breaking power E can be changed many times. However, each time the cutoff power E is changed, the set value Ps and the threshold value I (= E × 50%) become smaller, and it becomes difficult to perform constant power consumption control of the load adjustment air conditioners 2a, 2b, 2c, and 2d. Generally, it is considered that the change of the set value is at most about 3 times.

  The relationship between the adjustment power F and the cutoff power E will be described with reference to FIG.

  The adjusted power F obtained at time t1 within the demand time limit is the power consumption G of the demand control target load 1 after 30 minutes, which is expected when the power usage C of the demand control target load 1 at the time t1 is maintained as it is. , The power consumption H of the demand control target load 1 after 30 minutes, which is expected when the power is used while passing the target power A at the end of the demand period from the power consumption C of the demand control target load 1 at time t1 And the difference. That is, the adjusted power F is an amount indicating how much power is adjusted (reduced) from the current power C used by the demand control target load 1 so that the power used at the end of the demand time period reaches the target power A. is there. B is the power consumption of the demand control target load 1 at the end of the demand time period, which is expected when the power consumption C of the demand control target load 1 at time t1 is maintained as it is. E1 indicates the initial cut-off power at the start of the demand time limit. E2 indicates the cutoff power that is updated according to the corrected set value Ps.

  When the adjustment power F obtained at time t1 reaches the threshold value I, the set value Ps is reduced by the adjustment power F. By reducing the set value Ps, the adjustment power F is reduced from the power consumption P of the load adjustment air conditioners 2a, 2b, 2c, and 2d. With this power adjustment, the power that can be adjusted for the load adjustment air conditioners 2a, 2b, 2c, and 2d is the difference (= E1−F) between the initial cutoff power E1 and the adjusted power F. This difference is used as the subsequent cut-off power E2.

  Therefore, even if the power used by the demand control target load 1 increases after the time t1 within the same demand time period and the adjusted power F obtained at that time reaches the cut-off power E2, the load of the adjusted power F is adjusted. It can be reduced from the power consumption P of the air conditioners 2a, 2b, 2c, 2d. Therefore, the power used by the demand control target load 1 can be reliably matched with the target power A at the end of the demand time period, and highly reliable demand control is possible.

  In addition, since the power adjustment is performed when the adjustment power F reaches the threshold value I smaller than the cutoff power E, the adjustment power F becomes difficult to reach the cutoff power E. As a result, the load adjustment air conditioners 2a, 2b, 2c, 2d The number of situations leading to a stop can be minimized. That is, the air conditioning of the load adjusting air conditioners 2a, 2b, 2c, and 2d can be continued without stopping as much as possible, and the comfort of the indoor space that is air-conditioned by the load adjusting air conditioners 2a, 2b, 2c, and 2d. Will improve.

  In the constant power consumption control, the load adjustment air conditioners 2a, 2b, 2c, 2d are used for load adjustment so that the total value of the power consumption P of the load adjustment air conditioners 2a, 2b, 2c, 2d always matches the set value Ps in the set value storage unit 17. The air conditioning capability (output frequency of each inverter) of the air conditioners 2a, 2b, 2c, 2d must be controlled. At this time, the distribution of electric power to each load adjustment air conditioner 2a, 2b, 2c, 2d may be equally distributed to each load adjustment air conditioner 2a, 2b, 2c, 2d, or each load adjustment. Some sort of weighting may be given to the air conditioner for air conditioning and apportioned according to the weighting.

[2] Second embodiment
As shown in FIG. 4, the adjusted power F includes the demand time period Δtd and the elapsed time tpres from the start of the demand time period as shown in the equation (1) even when the power used does not change between the time t1 and the time t2. As the difference between the two (= Δtd−tpres) approaches zero, that is, as the remaining demand time limit Δtd decreases, the difference increases rapidly. Therefore, in the power adjustment just before the end of the demand period, there is a high possibility that the power used by the demand control target load 1 will exceed the target power A with a slight error or calculation delay.

  Therefore, in the second embodiment, the setting value correction unit 18 performs the correction correction of the setting value Ps according to the setting value reduction instruction from the comparison determination unit 16, and the remaining time until the end of the demand time period is constant as shown in FIG. It is executed (allowed) only when the time is Δtx or more. That is, the reduction correction of the set value Ps is permitted when the remaining time until the end of the demand time period is equal to or longer than the predetermined time Δtx, and is prohibited when the remaining time until the end of the demand time period falls within the predetermined time Δtx.

With this configuration, it is possible to solve the problem that the power used by the demand control target load 1 exceeds the target power A at the end of the demand time limit.
Other configurations and operations are the same as those in the first embodiment.

[3] Third embodiment
The demand control device 10 of the third embodiment acquires the air conditioning temperature (room temperature) of the load adjustment air conditioners 2a, 2b, 2c, 2d, and out of the load adjustment air conditioners 2a, 2b, 2c, 2d. The air conditioner for load adjustment in which the air-conditioning temperature has reached a predetermined limit value (cooling room temperature upper limit value Tac / heating room temperature lower limit value Tah) is excluded from the power adjustment load.

  Specifically, as illustrated in FIG. 5, the demand control device 10 includes a room temperature acquisition unit 21, an unapplicable load determination unit 22, a temperature storage unit 23, in addition to the configuration of the first embodiment or the second embodiment. It includes a set value apportioning unit 24 and set value storage units 25a, 25b, 25c, and 25d.

  The room temperature acquisition unit 21 acquires the indoor temperatures Ta1, Ta2, Ta3, and Ta4 detected by the indoor temperature sensors of the load adjustment air conditioners 2a, 2b, 2c, and 2d.

  The unapplied load determination unit 22 includes the room temperature Ta1, Ta2, Ta3, Ta4 acquired by the room temperature acquisition unit 21 and the room temperature limit value stored in the temperature storage unit 23 (cooling room temperature upper limit Tac / heating room temperature). The lower limit value Tah), and when any of the indoor temperatures Ta1, Ta2, Ta3, Ta4 reaches the indoor temperature limit value, the air conditioning for load adjustment corresponding to the indoor temperature that has reached the indoor temperature limit value An instruction to that effect is sent to the power control unit 11, the set value correction unit 18, and the set value apportioning unit 24 to exclude the machine from the power adjustment load.

  The set value apportioning unit 24 takes in the set value Ps in the set value storage unit 17 every time the set value Ps is updated and stored, and at the time of taking in, whether or not an exclusion instruction has been received from the non-applicable load determining unit 22. Check and if the exclusion instruction has not been received, the set value Ps that has been taken in is apportioned and apportioned according to the air conditioning capability (output horsepower) of all the load adjustment air conditioners 2a, 2b, 2c, and 2d. Each obtained set value is updated and stored in the set value storage units 25a, 25b, 25c, and 25d. In addition, when receiving the exclusion instruction, the set value apportioning unit 24 uses the set value Ps that has been taken in according to the air conditioning capability of the remaining load adjustment air conditioners excluding the load adjustment air conditioner to be excluded. Apportioning and each setting value obtained by apportioning is updated and stored in each corresponding setting value storage unit.

For example, the air conditioning capabilities (output horsepower) of the load adjusting air conditioners 2a, 2b, 2c, and 2d are “2.5HP”, “2.5HP”, “5.0HP”, “10.0HP”, and the set value Ps is stored in the set value storage unit 17. When “40 kW” is updated and stored, if no exclusion instruction is received from the unapplicable load determination unit 22 at this time, the set value apportioning unit 24 stores all the set values Ps (40 kW) in the set value storage unit 17. The load adjustment air conditioners 2a, 2b, 2c, and 2d are divided into set values Ps1, Ps2, Ps3, and Ps4 as follows according to the air conditioning capacities, and these set values Ps1, Ps2, Ps3, and Ps4 are distributed. The set value storage units 25a, 25b, 25c, and 25d are updated and stored.
Ps1 = 40 × 2.5 ÷ (2.5 + 2.5 + 5.0 + 10.0) = 5.0kW
Ps2 = 40 × 2.5 ÷ (2.5 + 2.5 + 5.0 + 10.0) = 5.0kW
Ps3 = 40 × 5.0 ÷ (2.5 + 2.5 + 5.0 + 10.0) = 10.0kW
Ps4 = 40 × 10.0 ÷ (2.5 + 2.5 + 5.0 + 10.0) = 20.0kW
Since the power control unit 11 has not received an exclusion instruction from the non-applicable load determination unit 22, the power consumptions P1, P2, P3, and P4 of the load adjustment air conditioners 2a, 2b, 2c, and 2d are stored as set values. The air conditioning capacity (output frequency of each inverter) of the load adjusting air conditioners 2a, 2b, 2c, 2d is set so that the set values Ps1, Ps2, Ps3, Ps4 in the units 25a, 25b, 25c, 25d are constant. Control. The total power consumption of the power adjustment load is 40kW.

  In this state, for example, when an exemption from the load adjustment air conditioner 2b is instructed from the non-applicable load determination unit 22, the power control unit 11 loads the load adjustment air conditioner 2a, excluding the load adjustment air conditioner 2b, Load adjusting air conditioners 2a, 2c, 2d so that the respective power consumptions P1, P3, P4 of 2c, 2d are constant at the set values Ps1, Ps3, Ps4 in the set value storage units 25a, 25c, 25d, respectively. Control the air conditioning capacity. The total power consumption of the power adjustment load is 35 kW (= 5.0 kW + 10.0 kW + 20.0 kW).

  The instruction to exclude the load adjustment air conditioner 2 b is received not only by the power control unit 11 but also by the set value correction unit 18. The set value correction unit 18 adjusts the air conditioning for load adjustment among the set values Ps1, Ps2, Ps3, and Ps4 in the set value storage units 25a, 25b, 25c, and 25d so as to match the air conditioning capability control of the power control unit 11. Select the remaining set values Ps1 (5.0kW), Ps3 (10.0kW), and Ps4 (20.0kW) excluding the set value Ps2 for the machine 2b, and newly set the total value of the selected set values Ps1, Ps3, and Ps4 It is updated and stored in the set value storage unit 17 as the value Ps (35.0 kW).

  As the set value Ps is updated and stored, the set value Ps (35.0 kW) in the set value storage unit 17 is updated and stored in the cut-off power storage unit 15 as a new cut-off power E. As shown in FIG. 6, the cutoff power E is smaller than the cutoff power E stored so far by the air conditioning capacity corresponding to the set value Ps2 (5.0 kW).

  Note that when the instruction to exclude the load adjustment air conditioner 2b has not yet been released when the set value Ps is updated and stored, the set value apportioning unit 24 sets a new set value Ps (35.0 in the set value storage unit 17). kW) is apportioned into set values Ps1, Ps3, and Ps4 as follows according to the air conditioning capabilities of the three load adjusting air conditioners 2a, 2c, and 2d, excluding the load adjusting air conditioner 2b. These set values Ps1, Ps3, and Ps4 are updated and stored in the set value storage units 25a, 25c, and 25d. However, in this case, the set values Ps1, Ps3, and Ps4 that are updated and stored are the same values as before the update.

Ps1 = 35 × 2.5 ÷ (2.5 + 5.0 + 10.0) = 5.0kW
Ps3 = 35 × 5.0 ÷ (2.5 + 5.0 + 10.0) = 10.0kW
Ps4 = 35 × 10.0 ÷ (2.5 + 5.0 + 10.0) = 20.0kW
In this case, the power control unit 11 uses the power consumption P1, P3, and P4 of the load adjustment air conditioners 2a, 2c, and 2d excluding the load adjustment air conditioner 2b as the set value storage unit 25a as before the update. , 25c, 25d, the air conditioning capabilities of the load adjusting air conditioners 2a, 2c, 2d are controlled so as to be constant to the set values Ps1, Ps3, Ps4. The total power consumption of the power adjustment load will be 35 kW (= 5.0 kW + 10.0 kW + 20.0 kW), the same as before the update.

  In this state, when the instruction to exclude the load adjustment air conditioner 2b is canceled, the power control unit 11 uses the power consumption P1, P2, P3 of each of the load adjustment air conditioners 2a, 2b, 2c, 2d. , P4 are controlled to be constant at the set values Ps1, Ps2, Ps3, and Ps4 in the set value storage units 25a, 25b, 25c, and 25d, respectively, to control the air conditioning capability of the load adjusting air conditioners 2a, 2c, and 2d. The total power consumption of the power adjustment load will return to 40kW (= 5.0kW + 5.0kW + 10.0kW + 20.0kW).

  The instruction to exclude the load adjustment air conditioner 2 b is received not only by the power control unit 11 but also by the set value correction unit 18. The set value correction unit 18 sets the set value Ps1 (5.0 kW), the set value Ps2 (5.0 kW), and Ps3 in the set value storage units 25a, 25b, 25c, and 25d so as to match the air conditioning capability control of the power control unit 11. (10.0 kW) and Ps4 (20.0 kW) are all selected, and the total value of these set values Ps1, Ps2, Ps3, and Ps4 is updated and stored in the set value storage unit 17 as a new set value Ps (40.0 kW).

  With the updated storage of the set value Ps, the set value Ps (40.0 kW) in the set value storage unit 17 is updated and stored in the cutoff power storage unit 15 as a new cutoff power E.

The operation will be described.
For example, when the room temperature Ta2 of the room air-conditioned by the cooling operation of the load adjustment air conditioner 2b rises due to the influence of the surrounding environment change or the like and exceeds the cooling room temperature upper limit Tac, the load adjustment air conditioner 2b is excluded from the load for power adjustment. Then, the power consumption P1, P3, P4 of the load adjustment air conditioners 2a, 2c, 2d excluding the load adjustment air conditioner 2b becomes the set values Ps1, Ps3, Ps4 in the set value storage units 25a, 25c, 25d. The air conditioning capabilities of the load adjustment air conditioners 2a, 2c, and 2d are controlled so as to be constant.

  Since the load adjustment air conditioner 2b excluded from the power adjustment load is released from the constant control of the air conditioning capability, the cooling capability sufficient to bring the room temperature Ta2 to the target temperature lower than the cooling room temperature upper limit value Tac. Demonstrate. Thereby, the comfort of the indoor space cooled by the air conditioner 2b for load adjustment can be ensured.

  Further, for example, when the room temperature Ta3 of the room air-conditioned by the heating operation of the load adjustment air conditioner 2c falls due to the influence of the surrounding environment change or the like and falls below the room temperature lower limit value Tah during heating, the load adjustment air The harmony machine 2c is excluded from the power adjustment load. Then, the power consumption P1, P2, P4 of the load adjustment air conditioners 2a, 2b, 2d excluding the load adjustment air conditioner 2c becomes the set values Ps1, Ps2, Ps4 in the set value storage units 25a, 25b, 25d. The air conditioning capabilities of the load adjusting air conditioners 2a, 2b, and 2d are controlled so as to be constant.

  Since the load adjusting air conditioner 2c excluded from the power adjusting load is released from the constant control of the air conditioning capability, the heating capability sufficient to bring the room temperature Ta3 to the target temperature higher than the room temperature lower limit value Tah during heating. Demonstrate. Thereby, the comfort of the indoor space heated by the air conditioner 2c for load adjustment can be ensured.

[4] Modification
In each of the above embodiments, the case where the power adjustment load is an air conditioner has been described as an example. However, as long as the power consumption can be adjusted, other devices may be used instead of the air conditioner. .

  In addition, the said embodiment and modification are shown as an example and are not intending limiting the range of invention. The novel embodiments and modifications can be implemented in various other forms, and various omissions, rewrites, and changes can be made without departing from the spirit of the invention. In these embodiments and modifications, the scope of the invention is included in the gist, and is included in the invention described in the claims and the equivalents thereof.

  The embodiments of the present invention can be used in buildings, factories, and the like that receive power.

  DESCRIPTION OF SYMBOLS 1 ... Demand control object, 2a, 2b, 2c, 2d ... Air conditioner for load adjustment (power adjustment load), 3a, 3b, 3c, 3d ... Unadjusted load (non-power adjustment load), 4 ... Electric energy Total 10 Demand control device 11 Power control unit (first control unit) 12 Power detection unit (detection unit) 13 Target power storage unit 14 Adjusted power calculation unit 15 Cut-off power storage unit , 16: Comparison determination unit (second control unit), 17: Setting value storage unit, 18 ... Setting value correction unit (second control unit), 21 ... Room temperature acquisition unit, 22 ... Unapplied load determination unit, 23 ... Temperature Storage unit, 24 ... set value apportioning unit, 25a, 25b, 25c, 25d ... set value storage unit

Claims (6)

Control the power consumption of the power adjustment load with variable power consumption included in the demand control target load to be the set value,
Detecting the power consumption of the demand control target load sequentially ,
Obtaining the power that must be adjusted in order to match the power usage of the demand control target load with the target power at the end of the demand time period, from the detected power usage and the target power,
When the calculated power for adjustment reaches a threshold value smaller than the set value, the set value is reduced by the power for adjustment,
The power adjustment load is stopped when the determined adjustment power reaches the reduced set value;
The demand control method characterized by the above-mentioned. The reduction of the set value is executed only when the remaining time until the end of the demand time limit is a certain time or more,
The demand control method according to claim 1, wherein: The power adjustment load is a plurality of air conditioners,
Among the air conditioners, exclude air conditioners whose air conditioning temperature has reached a predetermined limit value from the load for power adjustment,
The demand control method according to claim 1 or 2, characterized by the above. First control means for controlling the power consumption of the power adjustment load whose power consumption included in the demand control target load is variable to be a set value;
Detecting means for sequentially detecting power used by the demand control target load;
Calculation means for obtaining the power that must be adjusted in order to match the power consumption of the demand control target load with the target power at the end of the demand time limit from the power consumption detected by the detection means and the target power;
When the power for adjustment obtained by the computing means reaches a threshold value smaller than the set value, the setting value is reduced by the amount of power for adjustment, and the obtained power for adjustment is reduced. Second control means for stopping the power adjustment load when the value is reached;
A demand control apparatus comprising: The second control means executes the reduction of the set value only when the remaining time until the end of the demand time limit is a predetermined time or more,
The demand control apparatus according to claim 4, wherein The power adjustment load is a plurality of air conditioners,
The first control unit excludes, from the power adjustment load, an air conditioner in which an air conditioning temperature has reached a predetermined limit value among the air conditioners.
The demand control device according to claim 4 or 5, wherein

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