JPS6315625A - Demand controller - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device (demand control device) that monitors and controls the amount of power used during a demand period so that it does not exceed the contracted power.

[Prior Art] FIG. 3 shows a conventional demand control device disclosed in Japanese Unexamined Patent Publication No. 55-43950.

Loads (A) to (N) are supplied with power from a power supply line (2). The amount of electric power used by the loads (A) to (N) is measured by a wattmeter with transmitter (4),
is input.

The demand control device (1) performs the following control so that the power consumption does not exceed the contract power, and the target power consumption for 30 minutes (referred to as target demand value) calculated based on the contract power is set. The 0 time limit section (10) stored in the value storage section (8) measures the demand time limit (in this case, 30 minutes as described above).

Based on the power consumption and elapsed time, the arithmetic processing unit (12)
A prediction (fi (hereinafter referred to as predicted demand value) of power consumption at the end of the demand time period) is calculated.

It also calculates how much more power can be used than the reference power at each point in time, and how much power consumption must be reduced (hereinafter referred to as adjusted power).

This adjusted power is calculated by the following formula.

When a certain period of time (for example, 10 minutes) has elapsed from the start of demand time measurement, the predicted demand value will be
If the target demand value is exceeded, the arithmetic processing unit (12) issues an alarm signal, and this alarm signal is sent to the alarm control unit (14).
+: Given, alarm buzzers (18A) to (18N) are operated via control power lines (16a) to (16N). Even though the alarm has been issued, if the power usage is not suppressed and the amount used increases and the adjusted power value exceeds the cutoff power value, the arithmetic processing unit (12) outputs a cutoff signal. . This cutoff signal is given to the load control section (20), and the loads (A) to (N) are cut off via the control power lines (22A) to (22N). At this time, the arithmetic processing unit (12) cuts off only the load necessary to make the predicted demand value fall below the target demand value.

In this way, the demand control device (1)
An alarm is issued when the predicted demand value exceeds the target demand value, and a predetermined load is cut off when the adjusted power value exceeds the cutoff power value. As a result, the average power usage value is controlled so as not to exceed the target demand value in each 30-minute demand time period.

[Problems to be Solved by the Invention] In conventional demand control devices, a warning is always issued in advance when the demand control is activated and the load is cut off. However, if there are no workers near the load due to automatic operation, etc., there is no need to issue a warning prior to load cutoff, and if the warning is issued with sound, there is a problem that the sound of the warning may actually cause noise. Was.

An object of the present invention is to solve the above problems and provide a demand control device that is inexpensive and highly redundant.

[Means for Solving the Problems] As shown in FIG. 1, the demand control device according to the present invention includes pulse input means, time signal generation means, set value storage means, predicted demand value calculation means, and adjusted power value calculation means. means, alarm signal generation means, and cutoff signal generation means. Furthermore, it is provided with signal transmission means for converting the alarm signal, cutoff signal, and re-start signal into serial signals, adding an address code of the control device to which these signals are to be given, and sending them out to the transmission line. The load control device and the alarm control device are provided near the group of loads and the alarm means, respectively, and are arranged to receive signals from the transmission means via the transmission path. Each alarm control device is provided with an alarm buzzer and an alarm release switch.

[Effect] Next, the operation will be explained using FIG. 1.

The adjusted power calculation means calculates the adjusted power value based on the time signal, the target demand value, and the predicted demand value.

Further, the predicted demand value calculation means calculates the predicted demand value based on the time signal and the measured power.

If the predicted demand value exceeds the target demand value, the alarm signal generating means outputs an alarm signal. This alarm signal is added with the address code of the alarm means to issue the alarm by the transmission means, is configured into a serial signal, and is output to the transmission line.

The alarm control device called by the address code receives the alarm signal and operates the alarm means if the alarm release switch is OFF, that is, if the mode is set to issue an alarm.

Next, if the adjusted power value exceeds the cutoff power value, the cutoff signal generating means outputs a cutoff signal. This signal also
After an address code is added, it is output to the transmission line,
A predetermined load control device is called and the load is cut off.

[Example] FIG. 2 shows an embodiment of the present invention.

This will be explained below using FIG. 2.

IJ control unit of demand control device (101)
includes an input control section (106), a storage section (108), an arithmetic processing section (112), a signal transmission section (114), and a time limit section (11).
8).

The power used by the load (100A) to (100N) is
The input control section (101) of the control unit (101) is
The 0 time limit section (11g) outputted to 106) generates a time FA times signal. The input control unit is a wattmeter with transmitter (104
) is converted into a predetermined signal (for example, an 8-bit digital signal) corresponding to the power used by each load.

The arithmetic processing unit (112) counts the signals and stores the result in the storage unit (10B). Arithmetic processing unit (112)
The unit is composed of an 0mI pre-program measurement demand value calculation unit, an adjusted power calculation unit, a vIJFi signal generation unit, and a cutoff signal generation unit, which perform calculation processing according to the contents of a program stored in a storage means (not shown).

The arithmetic processing unit (112) of the control unit (101) is
a demand time limit set by the time limit setting section (120), and the power usage of the load converted into the predetermined signal;
A predicted demand value is calculated according to a time signal output from a time limit unit (118) and a program built in the predicted demand value calculation unit. Next, n11 set value storage section (
Based on the target demand value set in 108) and the time limit signal output from the time limit section (118), the adjusted power value is calculated according to a program built in the above-mentioned adjustment power calculation section. Then, it is determined whether or not the predicted demand value exceeds the target demand value, and if the predicted demand value exceeds the target demand value, a first alarm signal is outputted according to a program built in the alarm signal generating section. This signal is converted into a serial signal by adding an address code in the signal transmission unit (114), which is a signal transmission means, and is converted into a serial signal through the transmission path (114).
16). The transmission line (116) at this time is
The signal to be sent out is read out by a preset clock. Alarm buzzer (130) ~ (13ON
) and loads (100A) to (100N) each have an address code, and an alarm control device (301),
.

, the load control device (201), . Therefore, in this case, the alarm buzzer (
130A), (130B), . . . only the alarm control device (301) is called and receives the alarm signal. If the alarm release switch (312) is set to OFF, the alarm buzzer (130A
) are activated. This causes the first alarm buzzer to sound, indicating that the predicted demand value exceeds the target demand value.

It is determined whether or not the power capacity exceeds the power capacity of the next load to be applied, which is stored in the self-memory unit (108). If it exceeds the power capacity, a second alarm is output and the same process as above is performed. Sound the alarm buzzer (130A), and the signal transmission section (114)
Then, it is added to the address code cutoff signal of the load (100A) corresponding to the alarm buzzer and output to the transmission line (116). The load control device (201) connected to the load (100A) receives the cutoff signal and then cuts off the power supply to the 5L back (100A). In addition to the alarm buzzer, an alarm lamp or the like can also be used as the alarm means.

If there is no worker near the load due to automatic operation, etc., there is no need to sound the alarm buzzer, and the alarm +1 release switch (
312), the load can be immediately cut off without issuing an alarm.

The load control device (201) or alarm control device (301) installed near the shellfish has a signal transmission section (202,
30, 2), arithmetic processing unit (204, 304), address setting unit (206, 306), output control unit (208, 308)
), a load control section (210), and an alarm control section (310), a signal transmission section (114) and (202), or (
302) is the exchange of serial signals loaded with address codes, as described above. The arithmetic processing unit (204, 304) includes an address setting unit (206,
306), the alarm buzzer or load that should output an alarm signal or cutoff signal is determined, and an alarm is sent to the alarm control section (310) via the output control section (208, 308). The signal is sent to the load control unit (210
) outputs a cutoff signal.

[Effects of the Invention] According to the present invention, each alarm control device is equipped with an alarm release switch, so when there is no need to issue an alarm due to automatic operation, etc., it is possible to immediately cut off the load, which is different from conventional devices. A demand control device that is more flexible and economical can be provided.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of the present invention, FIG. 2 is a diagram showing one embodiment, and FIG. 3 is a diagram showing a conventional demand control device.

Claims (1)

[Claims] (1) Pulse input means that receives and counts the number of pulses from a wattmeter with a transmitter, converts it into a predetermined transmission signal, and outputs it, time signal generation means that generates a time signal, target demand value, and cutoff power value for each load. a set value storage means for storing power capacity; a predicted demand value calculation means for calculating a predicted demand value at the end of the demand time period from the signal output from the pulse input means and the time limit signal; the predicted demand value, the time limit signal, and Adjusted power value calculating means for calculating adjusted power from a target demand value; Alarm signal generating means for outputting an alarm signal when the predicted demand value exceeds a predetermined value and when a cutoff signal is output; A cutoff signal generating means that outputs a cutoff signal when the value exceeds a load capacity value to be applied next; an address code of an alarm control device that should give the alarm signal; or an address code of a load control device that should give the cutoff signal. signal transmitting means for transmitting the alarm signal and the cutoff signal as serial signals; at least one alarm control device that is called by the address code of the serial signal and operates the alarm means in response to the alarm signal; A load control device that is called by an address code of a signal and cuts off a load in response to the cutoff signal; and an alarm canceling device that is provided in the alarm control device and cancels the alarm so that the alarm means does not operate. A demand control device featuring: