JPS61199428A - 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 demand control IF that monitors and controls the amount of power used during a demand period (for example, 30 minutes) so that it does not exceed the contracted power.

[Conventional technology]

Conventionally, as this type of demand controller device, there is one shown in the block diagram shown in FIG. 5, which is disclosed in, for example, Japanese Patent Laid-Open No. 55-43950. In the figure, the demand control device 1 shown surrounded by a broken line frame includes an arithmetic processing section 4, an input/output control section 5, a display setting section 6, and a control relay section 7.
, an alarm relay section 8, a time limit section 11, and an output control section 12.

2 is a power consumption meter with a transmitting device; 9-1 to 9-n are loads that are connected to the control relay unit 7 and are cut off for the purpose of power adjustment; and 10-1 to 10-n are loads that notify demand alarms ( For example, Bell).

The electricity meter 2 with a transmitting device receives the secondary side outputs of the transformer PT and current transformer CT provided in the power supply connection path to the load 3 as input, and receives a pulse signal proportional to the amount of power used in the load 3. Send. The input control section 5 receives and counts this pulse signal.

The time limit section 11 measures a demand time limit, generates a demand time limit signal of, for example, 30 minutes, and outputs a calculation signal that determines a calculation interval at fixed time intervals.

The arithmetic processing section 4 calculates the count value of the input control section 5 and the time limit section 11.
A predicted value of the demand value at the end of the demand time period is calculated from the remaining time period, and it is determined whether or not this predicted value exceeds the target demand value set in the display setting section 6. and generates an alarm signal.

Further, the adjusted power is calculated based on the predicted value, and when the calculated adjusted power value exceeds the cutoff power value set in the display setting section 6, a second alarm is generated and a load cutoff signal is generated. generate.

These alarm signals and load cutoff signals are sent to the output control section 12.
The alarm signal drives the corresponding relay of the alarm relay section to control the corresponding loads 10-4 to 10-0. The load shedding signal is sent to the corresponding I of the control relay section 7.
J l/- is driven to control the corresponding loads 9-1 to 9-n.

[Problem that the invention seeks to solve]

Conventional demand control devices are configured as described above, so if the loads to be controlled are scattered over a long distance or the locations where demand alarms are sent are dispersed, the load control power lines can be individually extended from this device. The cost of construction was much higher than that of a demand control device, especially if the wiring distance was long. In addition, it is expensive compared to the required functions because it includes functions that are not required by customers who have a small number of load points to be controlled, or who do not require load control or demand alarm output. There were some problems with the product, and there was a demand for it to be made cheaper, even if it meant cutting out unused features.

This invention was made to solve the above-mentioned problems.By separating the main unit, alarm unit, and control unit, each device can be placed and installed in a desired location, and the load can be optimally controlled. The purpose is to obtain a demand control device that can perform the following tasks.

[Means for solving problems]

The demand control device according to the present invention has a main unit, an alarm unit, and a control unit that are separated and independent, each device has a built-in signal transmission section, and a dedicated signal line is used to cross-wire between these devices. A load capacity setting unit is provided in the base unit so that various data such as address signals and control signals can be transmitted and received between →J- and time-division multiplex transmission as indicated in italics.

[For production]

The base unit, alarm unit, and control unit in this invention have separate and independent equipment configurations, so they can be placed and installed in any location as needed, and the unit configuration can be assembled as needed, allowing optimal load control. I can do it.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1, in which the same parts as in FIG. 5 are denoted by the same reference numerals.

In FIG. 1, 100 is a base unit, 2oo is an alarm unit, 300 is a control unit, and 131 and 132 are terminals 107.
, 201, and 301.

The main unit 100 has an input control unit 10 centered around an arithmetic processing unit 103.
11, a time limit section 102, a setting section 104, a display section 105, a signal transmission section 106, and a load capacity setting section 108.

The alarm unit 200 and the control unit 300 each include signal transmission sections 202 and 302, arithmetic processing sections 203 and 303,
Address setting section 204, 304, output control section 205, 3
05, an alarm relay section 206, and a control relay section 306, and connects loads 401 to 40n and 501 to 50n.

Next, the present invention will be explained in detail. The base unit 100 is a central unit of this device, and receives and counts the transmitted pulses from the power meter 2 with a transmitting device at the input control unit 101. The time limit unit 102 generates and outputs a demand time limit of, for example, every 30 minutes, and also outputs a calculation signal that determines a calculation interval at a fixed time interval.

The arithmetic processing unit 103 calculates a predicted value of the demand value at the end of the demand time period from the count value of the input control unit 101 and the remaining time limit of the time limit unit 102, and this predicted value becomes the target demand value set in the setting unit 104. It is determined whether or not it exceeds this, and if it exceeds this, a first alarm signal is generated.

Further, an adjusted power value is calculated based on the predicted value, and when the first alarm occurs, the calculated adjusted power value is the load that is currently applied among the load capacities set in the load capacity setting section 108. When either load capacity is exceeded, a second alarm signal is generated and a load cutoff signal is generated.

These calculation results and alarm signals are displayed on the display unit 105. Further, these data are passed to a signal transmission section 106, where they are converted into a predetermined transmission signal and outputted to a terminal 107.

This transmission signal is transmitted to the alarm unit 2 via the signal line 131.
00 is input to the terminal 201 and received by the signal transmission section 202. This signal transmission section 202 demodulates the received signal and transmits it to the arithmetic processing section 203. This calculation processing unit 203
The signal set in the address setting unit 204 reads its own address address and determines whether the transmitted signal is given to its own address,
If it is related to itself, it outputs a signal to the output control unit 205 according to the content, drives the corresponding relay circuit of the alarm relay unit 206, and controls the corresponding loads 401 to 4On connected thereto. Then, the control unit 30
0 terminal 301 is connected to the terminal 201 of the alarm unit 200 via the signal line 132, and is connected to the signal transmission section 302, the arithmetic processing section 303, the address setting section 304, and the output control section 3.
05, the control relay section 306 is connected to the alarm unit 20, respectively.
A similar operation is performed in response to the corresponding portion of 0, and the base unit 100
The corresponding loads 501 to 50n connected to the control relay section 306 are controlled according to the signals transmitted from the control relay section 306.

Similarly, when the predicted demand value falls below the target demand value and the adjusted power value exceeds the load capacity of any of the currently cut-off loads, a turn-on signal for that load is generated, and the same operation as described above is performed for the loads 501 to 501. Inject 50n.

Note that the transmission signal is converted into a serial signal by the signal transmission sections 106, 202 and 302, and is transmitted to the signal line 131. You can put it on '132. Therefore, for example, two-core twisted pair cables or the like can be used for the signal lines 131 and 132.

FIG. 2 is a diagram showing the configuration of signals transmitted between signal transmitting sections 106, 202, and 302. In this transmission, the master unit 100 sequentially calls so-called slave units (hereinafter referred to as slave units) such as the alarm unit 200 and the control unit 30'0 by a polling method to send and receive necessary commands and data.

First, address word 601 is sent out.

This address word 601 is used to identify which slave unit the base unit 100 is transmitting to, and the slave unit that matches the setting value of the address setting section 204.304 of the slave unit is the destination of the transmission. becomes.

Next, control word 602 is sent out.

This control unit 02 is a code for a command that indicates what kind of operation is to be performed from the base unit 100 to the slave unit that is the transmission partner.For example, it can be roughly divided into two operation modes: control operation mode and data length specification mode. can be determined.

In other words, when controlling a slave unit in some way, for example, a specific code is associated with a certain control action, and when the slave unit receives that code, it decodes the code and performs the corresponding action in advance. .

The data length designation mode is used to designate the length of data to be transmitted when communicating data with a slave unit, and designates whether a data word (to be described later) has an extra byte. For example, when this code is OOH, the data is 0 bytes, when this code is OIH, the data is 1 byte, and when this code is 02H, the data is 2 bytes.
Similarly, at 08H, the data length is 8 bytes.

Next, a first sum check word 603 is sent, and this first sum check word 603 is a value obtained by adding the codes of the address word 601 and control word 602, and is used to check for errors that may occur during transmission. This is the first thing you need to do. On the receiving side, the address word 601 and the received code of the control word 602 are added together, and the value is added to the first →normchinic word 60.
The values of 3 are compared, and only when they match, it is determined that normal transmission has occurred.

Data words 610-617 are then transmitted.

These data words 610 to 617 are data sent and received when data is transmitted between the base unit 100 and the slave unit.
It is transmitted when the control word 602 described in f is a code corresponding to the data length specification mode. That is, for example, when the control word 602 is 03H, the data word consists of 3 bytes 610,611°612, and when the control word 602 is 05H, the data word consists of 610,611°.
．． It consists of 5 bytes of 612.613614.

A second sum check word 618 is added to the end of data words 610-617 and transmitted. These words include the address word 601, control word 602, and
First sum check word 603 and data word 61
Add all the codes from 0 to 617, remove the ones that overflow, and send the addition result to the second sum check word 61.
Send as 8. This second sum check word is also for checking transmission errors in the same way as above.
The operation on the receiving side is similar to that for the first sum check word 603.

Figure 3 shows address word 601, control word)'
602, time chart 1 of the word structure of the first sum check word 603, for example, the address word 601 has a start bit 601a first, then signal bits 601b, and finally a stop bit 601c. There is.

FIG. 4 is a diagram illustrating the address word 601 in more detail. First there is a start bit 601a, and then a signal bit 601b is transmitted in a 9-bit configuration.

Of these, the last bit is a parity bit 601d for error checking. Finally, there is a stop pitch h601c.

This bit configuration is used not only in the control word 602 and the first sum check word 603, but also in the data word 1.
”610-617 and second sum check word 61
8 has a similar configuration.

Signal transmission is performed with the data structure as described above. Here, transmission errors are checked on the receiving side by the first and second
This is performed by checking the sum check words 603 and 618 and the parity bit for each word. Sunawaji main unit 1
When a signal having the configuration shown in FIGS. 2 to 4 is transmitted from 00 to the corresponding slave unit, the corresponding slave unit receives this signal and determines whether or not the signal given to itself is received by the address word 6.
Decipher 01 and make a decision.

Furthermore, the parity bit and the first and first sum check words 603 and 618 are checked, and if an error is detected in this check, no operation is performed and the signal is retransmitted from the base unit 100. Of course, if there is an error in the address word 601, an error such as sending a signal to a slave device with a non-existent address may occur. In this case, since the applicable slave device does not exist, the slave device does not perform any operation.

The base unit 100 waits for a certain period of time for a return signal indicating the completion of an operation or for data transfer from the slave unit. If there is no response during this time, the same signal as the previous time is sent to the corresponding slave unit again. If the slave device correctly receives this retransmitted signal, it sends the result back to the base device 100. If a reception error occurs in the retransmitted signal, the signal cannot be returned to the base unit 100, so the base unit 100 assumes that there is an abnormality in the slave unit and moves the polling operation to the next address.

In addition, in the above embodiment, for convenience of explanation, the case was explained in which one alarm unit 200 and one control unit 300 as slave devices were connected, but it is of course possible to connect as many of them as necessary. These slave units can be placed in distributed locations, and necessary signals and data can be transmitted and received from the base unit 100 to each of the slave units.

In addition, since various numbers of slave units can be connected, when the base unit 100 performs polling operations, if the number of slave units is memorized by some means, unnecessary polling operations may be avoided. This is advantageous in terms of transmission processing capacity.

For this purpose, setting means and storage means may be provided, such as setting the number of slave devices connected to the base device 100 using a switch or the like, or inputting the number of connections using a keyboard or the like and storing it in an internal memory circuit. .

Furthermore, when the power is turned on as a system without setting, as an initial process, the slave units are accessed sequentially from the base unit 100 side, and only the slave unit at the address that responds is determined to be connected, and that slave unit If the address is stored, the setting means can be made unnecessary.

〔Effect of the invention〕

As described above, according to the present invention, the base unit, the alarm unit,
Since each control unit has an independent and separate equipment configuration, wiring work can be done easily and inexpensively when the load to be controlled or the location where alarms are notified is far away or distributed, and each of the above units can be easily and inexpensively installed. can be placed wherever needed.

In addition, since you can select the alarm unit and control unit as needed, you can create a configuration that matches the required functions.
You can eliminate waste in terms of functionality and price.

Furthermore, since the parent unit is provided with a load capacity setting section, optimal load control can be performed by turning on/off the load capacity in accordance with the adjusted power value.

Furthermore, a parity check is performed for each word to check for transmission errors, and a parity check is performed for each word.
A sum check word is added to each transmission data, and a second sum check word is added to all transmitted data to increase transmission reliability, which has the effect of maintaining high transmission reliability. .

[Brief explanation of drawings]

FIG. 1 is a block diagram of a demand control device according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a signal transmitted by a signal transmission section, and FIG. 3 is a time chart of the configuration of each word in FIG. FIG. 4 is a time chart of the bit structure of the address word in FIG. 3, and FIG. 5 is a block diagram showing a conventional demand control device ff. 2 is a power consumption meter with a transmitting device, 100 is a base unit, 103 is an arithmetic processing unit, 106 is a signal transmission unit, 108 is a load capacity setting unit, 200 is an alarm unit, 202 is a signal transmission unit, 205
206 is an output control section, 206 is an alarm relay section, 300 is a control unit, and 131 and 132 are signal lines.

Claims (1)

[Claims] Receiving the transmitted pulses of a power meter with a transmitting device that converts the amount of power used at the power receiving point into a transmitted pulse and outputs the same, and monitors the amount of power used so that it does not exceed a predetermined target demand value;
In the demand control device to be controlled, a predicted value of the demand value at the end of the demand time period is calculated and displayed based on the value counted by receiving the transmitted pulses of the electricity meter with the transmitting device and the remaining time period, and the predicted value is set in advance. When it is predicted that the target demand value will be exceeded, a first alarm signal is generated, and the adjusted power is calculated and displayed based on the predicted value, and this calculated and displayed adjusted power value is used as the load capacity setting. If the load capacity of any of the currently applied loads exceeds the load capacity preset in the section, a second alarm signal is generated and displayed, and a load cut-off signal is generated and displayed, so that the predicted value of the above demand value is the target. When the adjusted power value exceeds the load capacity of any of the loads that are currently cut off, an arithmetic processing unit generates and displays a turn-on signal for that load, and a signal output from the arithmetic processing unit is converted into a predetermined A base unit having a signal transmission unit that converts it into a transmission signal and outputs it, and a signal transmission unit that receives the signal transmitted from the base unit and receives and demodulates the alarm signal at a preset address according to the content. An alarm unit outputs a signal to the output control section and controls the load at the alarm relay section, and receives the signal transmitted from the base unit, receives and demodulates the load shedding signal at a preset address, and outputs the signal to the alarm relay section. A unit and a control unit that performs the same operation are configured independently and separately, and a signal wire is used to connect the base unit and each unit, and cyclic timing is established between the base unit and each unit. 1. A demand control device configured to transmit and receive address signals, alarm signals, control signals, and return signals by division multiplex transmission.