JPH10108364A - Controller for working power quantity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain working power quantity from increasing further even if it is below maximum power quantity, by operating or stopping all electric apparatuses which are stoppable according to operating schedule data when a total of power quantity is less than a prescribed power quantity. SOLUTION: The data related to selected electric apparatuses A1 to An are set and inputted from an inputting part 7 previously and stored in a memory 5 through an I/O port 6. The data showing the sign of the electric apparatuses A1 to An during operating are also in the memory 5. Operating schedule data are also stored previously in the memory 5. Even when a total of power quantity of all the electric apparatuses A1 to An is less than a prescribed power quantity, all the operating electric apparatuses A1 to An are stopped temporarily for a prescribed stopping time, as far as no inconveniences or interferences occur to operation. It is thus possible to restrain a total of working power quantity of all the electric apparatuses A1 to An from increasing further for reduction in expenditure of power quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power consumption control device which further suppresses power consumption even in a situation where power demand control is not required.

[0002]

2. Description of the Related Art Generally, in a factory or the like of a power consumer using high-voltage power, a contract regarding a maximum allowable value of power to be used (hereinafter referred to as “demand contract power”) is negotiated with a power company. It is tied. The demand contract power concluded in this way is applied throughout the year as long as the power value is not exceeded, and is a very important value in terms of operation costs. For example, if the power consumption of the factory exceeds the demand contract power even instantaneously, the basic charge from the following month will rise, for example, by about 40%, and the unit price of the power usage charge (yen / kWH) itself will also increase.

[0003] For this reason, the factory determines in advance a maximum power value that is lower than the demand contract power, and the sum of the power consumption values of the respective electric devices input from the recordable power meter (so-called demand meter) is calculated. When the maximum power value is exceeded, an alarm output such as turning on a warning light or sounding an alarm is adopted so as not to exceed the demand contract power.

However, according to the above-described method, an alarm is simply output when the total power consumption of each device exceeds the maximum power value. Therefore, the alarm output is performed due to the carelessness of the supervisor or special circumstances. The response to was delayed,
In some cases, the sum of the power consumption values of the electric devices exceeds the demand contract power.

[0005] Therefore, the present inventor stops the stoppable devices among the running devices when the sum of the power values of all the running devices exceeds the maximum power value set below the demand contract power. By developing a power demand control device that automatically and reliably suppresses the sum of the power consumption values of all the operating devices to less than the inexpensive demand contract power of the power usage fee without manual intervention, We have filed an application (JP-A-7-59260).

[0006]

A sufficient power demand control, which is to automatically start and stop the electric equipment so that the total power consumption of the electric equipment does not exceed the demand contract electric power as described above, is sufficient. There is interest. However, except for the summer months when power consumption is concentrated, much attention is paid to the suppression of power consumption, and power demand control is mostly not performed throughout the year. However, even in a situation where the demand contract power does not exceed, it is necessary to reduce unnecessary power consumption as much as possible in consideration of suppression of consumption of valuable energy.

[0007] The present invention has been made in view of the above-described conventional problems, and the sum of the electric power values of all electric devices is less than the maximum electric power value set to be less than the demand contract electric power. It is an object of the present invention to provide a power consumption control device that can further suppress the power consumption even in a situation where the power consumption is not so tight.

[0008]

In order to achieve the above object, a power consumption control device according to the present invention detects power values of all operating electric devices and outputs a sum of the power values. Value sum output means, the sum of electric power values of the electric equipment,
A power value comparison unit that compares a predetermined power value set in advance to a value less than the allowable use power value, and a combination of the operation time and the stop time of the electrically operable electric device; Schedule storage means for storing operation schedule data which is set so that the total time is an integral fraction of the integration unit time relating to the integration of the used electric energy, and a total of the electric power values of the electric devices is less than a predetermined electric power value At this time, it is configured to include operation control means for operating or stopping all stoppable electric devices in accordance with the operation schedule data of the schedule storage means. Here, the use allowable power value refers to, for example, a value of a demand contract power, which is predetermined by a contract between a power company and a power consumer.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic circuit configuration of a power consumption control device according to one embodiment of the present invention. In the figure, 1 is an electric power consumption control device according to this embodiment, 2 is an arithmetic processing device (hereinafter abbreviated as CPU) mainly composed of an arithmetic unit 3 and a comparison unit 4, and 5 is mainly a CPU 2. A memory for exchanging stored data so that data can be rewritten and updated between the CPU and a memory;
, An input / output port for converting external data into input / output enabled, 7 is an input unit represented by a keyboard, etc., 8 is a CR.
T, a display unit such as a liquid crystal display, a warning lamp, etc., 9 is a printing unit typified by a printer or the like, 12 is a timer typified by a calculation clock that is provided in the calculation unit 3 and controls the calculation cycle, and 10 is a recording power. This is a pulse converter that converts an output signal (for example, amperage output) from the weighing device 11 into a pulse signal synchronized so as to be taken into the CPU 2 or the like.

By the way, devices that consume power in power consumers are roughly classified into electric devices that cannot be stopped during operation and electric devices that can be stopped even during operation. In Figure 1, A ₁ to A _n indicates an electric equipment latter can be stopped. These electric devices A _{1 to An} are:
Among all the devices that use the electric power, the electric power is selected in advance by the electric power consumer based on the operational importance and the capacity.

The electric devices A _{1 to} A selected as described above
Data relating to _n is set and input in advance from the input unit 7 and stored in the memory 5 via the input / output port 6. The memory 5, the operating device data area for storing data indicating the electric appliance A ₁ to A _n of the "in operation" is ensured.

The operation schedule data for executing the “power consumption control” unique to the present apparatus is also stored in the memory 5 in advance.
(An example of a “schedule storage unit” in the present invention). As shown in FIG. 3, the operation schedule data represents schedule contents in which the operation time To and the stop time Ts of the electric device that can be stopped are alternately combined, and the operation time To (here, for example, 16 minutes). Set) and stop time Ts (here,
(For example, set to 4 minutes), the total cycle time (= 20 minutes) is the power consumption integrated cycle time C
a (= 60 minutes). The power consumption integration cycle time Ca is an example of the “integration unit time” in the present invention. The “4 minutes” of the stop time Ts is set to a time that does not hinder the operation. For example, if the electric device that can be stopped is a cooling air conditioner, even if the air conditioner is operated for 16 minutes and stopped for 4 minutes, the user's feeling is not significantly impaired. It is enough to lower the temperature and drive for 16 minutes.

Further, operation schedule data for executing the well-known "power demand control" is also stored in the memory 5 in advance. As shown in FIG. 4, the operation schedule data represents schedule contents in which operation time (11 minutes) and stop time (4 minutes) are alternately combined.
The cycle time (15 minutes) obtained by adding the operation time and the stop time is set to be half of the demand monitoring cycle time (= 30 minutes) for monitoring the excess of the demand contract power.

On the other hand, the recordable power meter 11 is installed by a power company at a large power customer, and is connected so that power value data can be input to all devices that use power. Have been. Then, the recording type power meter 11 periodically takes in power value data from all the electric devices in operation and calculates and outputs the sum of the power value data.

The recordable power meter 11 includes a demand contract electric power contracted between the electric power company and the electric power consumer (which is the “allowable electric power value” in the present invention), and each of the operating electric devices. And a display (not shown) for displaying the power value of each of them, the sum of those power values, and the like. Then, the output terminal of the power value data on the side of the recording type power meter 11 and the input terminal on the side of the pulse converter 10 are connected when the power consumption control device 1 is installed.

A maximum power value Pa set to be less than the demand contract power in order to notify in advance that the demand contract power is approaching is input by the power consumer through the input unit 7 and the input / output port 6 in advance. 5 is stored. That is, the maximum power value Pa is an example of the “predetermined power value” in the present invention.

The power consumption control device 1 is configured as described above. Subsequently, an example of the control operation by the CPU 2 of the power consumption control device 1 will be described below with reference to the flowchart of FIG. Note that S in FIG.
1, S2, S3,... Indicate processing steps by the CPU 2, respectively. The contents of the flowchart by the CPU 2 are stored in advance in the ROM area of the memory 5 as program data.

Therefore, when the power of the power consumption control device 1 is turned on, the arithmetic processing by the CPU 2 starts.
First, in step S1, the maximum power value Pa is read from the memory 5 for setting in the comparison unit 4. Subsequently, in step S2, initial settings such as clearing the contents of the operating device data area and the power value data in the memory 5, clearing the time of the timer 12, and inputting the setting of the maximum power value Pa to the comparing unit 4 are performed. Done.

The electric power consumption of all the electric devices, regardless of the non-stoppable electric equipment and the stoppable electric equipment, is detected by the recordable power meter 11, and the sum Pt thereof is calculated and output. You. The total sum Pt of these used power values is input to the pulse converter 10 as an ampere output, where it is converted into a pulse output synchronized with a calculation cycle that can be taken into the CPU 2, and then converted via the input / output port 6.
The data is input to PU2 and set in the comparison unit 4 (S3). Of the stoppable electric equipment A ₁ to A _n, then the data specifying the electric equipment in operation is rewritten updated every calculation cycle to the operating device data area of the memory 5.
Here, the existing recording-type power meter 11 is used as the “power value sum output means” of the present invention, but the power value sum output means includes, for example, all the electric devices A _{1 to An.}
And the input / output port 6 may be directly connected to each other, and each power consumption value may be directly taken into the power consumption control device 1 to detect and sum up the power value.

On the other hand, in step S4, the comparing section 4 determines whether or not the sum Pt of the power values used by all the electric devices exceeds the maximum power value Pa. That is, the unit that realizes the function of step S4 by the comparing unit 4 is an example of the “power value comparing unit” according to the present invention. Here, when the sum Pt of the used power values does not exceed the maximum power value Pa (S4, No), a program related to “power usage control (non-demand control)” unique to the present apparatus is executed (S5). ). Therefore, the operation device data area of the memory 5 is searched to determine whether there is any electric device that is operating at that time (S6). If there is no running electric device (S
6, No), the electric apparatus A ₁ to A _n of possible stop is determined that all stopped (S14). On the other hand, if there is a running electric device (S6, Yes), operation schedule data (stop time = 4 minutes, operation time = 16 minutes) related to power usage control is read from the memory 5 and set in the calculation unit 3. (S7).

[0021] The operating section 3 starts each scheduled operation for the electric appliance A ₁ to A _n all (S
8). It is determined whether or not the current operation schedule data measured by the timer 12 is during the “operation time To” (S9), and if it is “the operation time To” (S9, Y
es), and outputs the operation command to the relevant electric appliance A ₁ ~A _n (S10), the electric appliance which receives the continue operation upon during operation, when the stopped to start the operation (S11), returning to step S3. When all the electric devices A _{1 to An} are started at the same time, a large amount of starting power is required. To avoid this, a fixed delay of 3 to 5 seconds is provided at the start of the first operation. The electric devices are sequentially activated. On the other hand, if the operation schedule data is during the “stop time Ts” (S9, N
o), for all of the electric appliances A ₁ to A _n outputs a stop command (S12), the electric appliance which receives the performing stop operation (S13), the flow returns to step S3. That is, the unit that realizes the functions of steps S5 to S13 by the arithmetic unit 3 is an example of the “operation control unit” according to the present invention.

On the other hand, in step S4, if the total sum Pt of the used power values exceeds the maximum power value Pa (S4).
4, Yes), a program related to “power demand control” is executed (S15). The processing operation of the "power demand control" (steps S15 to S23) is almost the same as the processing operation of the "power consumption control" described above (steps S5 to S13). Time = 4 minutes, operation time = 11 minutes. Thus, the sum P of the used power values of all the electric devices
When t exceeds the maximum power value Pa, all the electric devices that can be stopped are forcibly shut down, so that the total Pt of the used power values does not exceed the demand contract power.

As described above, in the apparatus according to the present embodiment, even when the sum of the electric power values of all the electric devices is less than the predetermined electric power value, all the operating electric devices can be operated within a predetermined range within a range that does not hinder the operation. Is temporarily stopped for the stop time Ts. For example, 1
The cycle operation of stopping for 4 minutes after running for 6 minutes is repeated. This cycle is a quarter of the power consumption integration cycle time (an example of the “integration unit time” in the present invention, which is 60 minutes). Therefore, even in a situation where the power demand control is not required, it is possible to reduce the sum of the power consumption values of all the electric devices and reduce the expenditure of the power usage fee.

Here, the economic effect of the present apparatus will be considered with reference to FIG. In this case, in order to facilitate understanding of the present invention, only the economic effect of the power consumption control will be described. For example, for a certain customer, the number of electric devices (air conditioners) to be controlled is 45, the capacity of each air conditioner is 2 kW, the operation time of the air conditioner is 10 hours / day, and the basic charge is 16.86. Circle/
Consider the case of kWH.

Saving by Power Consumption Control The power saving of all the electric appliances to be controlled is as follows: power saving = 2 kW / unit × 45 units × (8 minutes / 30 minutes) = 24 kW. Since the total downtime within the power consumption integration cycle time Ca is 4 minutes × 3 times = 12 minutes, the reduction in power consumption = (2 kW / unit × 45 units × (12 minutes / 60 minutes)) × 10H / day = 180kWH / day Reduction of electricity bill = 180kWH / day × 16.86 (yen / kWH) = 3034.8 yen / day (⇒1170702 yen / year).

Basic charge savings due to demand contract power reduction accompanying power usage control. (A) In demand monitoring cycle time A (see FIG. 3, in 30 minute units), the downtime is 8 minutes. = 2 kW / unit × 45 units × (8 minutes / 30 minutes) = 24 kW, and (ii) the demand monitoring cycle time B (see FIG. 3, in units of 30 minutes), the pause time is 4 minutes. The amount of decrease in demand contract power = 2 kW / unit × 45 units × (4 minutes / 30 minutes) = 12 kW.

At this time, the power company adopts the smaller value (12 kW of (b)) as the value for demand contract power update. Therefore, the savings of the basic fee = 12 kW / month × 1200 yen / kW = 14400 yen / month (⇒172800 yen / year). That is, a total amount of 1280,502 yen / year (+) can be reduced in one year. As is apparent from the results of these considerations, it is understood that the use of the power consumption control device 1 has a significant economic effect.

In the above-described embodiment, the total time of the operation time and the stop time of the electric device that can be stopped is set to one-fourth (integer) of the integrated unit time. The time is 1/1, 1/2, 1/3, 1 of the integration unit time.
/ 5,...

[0029]

As described above, according to the power usage control device of the present invention, even when the sum of the power values of all the electric devices is less than the maximum power value set in advance to be less than the allowable use power. According to the stop time of the operation schedule set so as not to hinder the operation, all the electric devices that can be stopped are automatically suspended, so the sum of the electric power values of all the electric devices is calculated. It saves power and keeps power usage fees low.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic circuit configuration of a power consumption control device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a calculation processing procedure of the power usage control device.

FIG. 3 is an explanatory diagram showing an operation schedule related to power consumption control of the power consumption control device.

FIG. 4 is an explanatory diagram showing an operation schedule related to power demand control of the power usage control device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Electric power consumption control apparatus 3 Operation part (an example of an operation control means) 4 Comparison part (an example of an electric power value comparing means) 5 Memory (an example of a schedule storage means) 11 Recordable electric power meter (an example of an electric power value sum output means) ) A _{1 to An} Electric equipment Ca Power consumption integration cycle time (an example of integration unit time) Pa Maximum power value (an example of a predetermined power value) Pt Total power value To Operation time Ts Stop time

Claims (1)

[Claims] 1. A power value sum output means for detecting a power value used by all operating electric devices and outputting a sum of the power values; A power value comparing means for comparing with a predetermined power value set in advance; and a combination of an operation time and a stop time of the electrically operable electric device. A schedule storage means for storing operation schedule data set to be an integral fraction of an integration unit time relating to the integration of the electric equipment; and a schedule storage means for storing the sum of power values of the electric equipment when the total power value is less than a predetermined power value. An electric power consumption control device comprising: operation control means for operating or stopping all stoppable electric devices in accordance with operation schedule data.