JPS61199426A - 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] This invention relates to a demand control device 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 a demand controller device for this Yuzu, for example, there was one disclosed in Japanese Patent Application Laid-open No. 55-43950, and the block diagram shown in Fig. 5. In Fig. 12, there is a demand control device shown surrounded by a 1-meter frame with a cutout. The device 1 includes an arithmetic processing section 4, an input/output control section 5, a display setting section 6, a control relay section 7, an alarm relay section 8, a time limit section 11, and an output limit section 12.
It consists of

2 is a power meter with a transmitter, 9-] to 9-n are loads connected to the control relay section 7 and cut off for the purpose of power adjustment, and 10-1 to 1O-rl are loads ( For example, Bell).

The electricity meter 2 with a transmitting device receives as input the secondary side outputs of the transformer PT' and the current transformer CT provided in the power supply connection path to the load 3, and outputs pulses proportional to the amount of power used in the load 3. send a signal. The human output control unit 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 human output control section 5 and the time limit section 1.
A predicted value of the demand value at the end of the demand time period is calculated from the remaining v time period of 1, and this predicted value is displayed in the display setting section 6.
It is determined whether or not the target demand value set in the target demand value is exceeded, and if the target demand value is exceeded, an alarm signal is generated.

Further, the adjusted power is calculated based on the upper d1 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. to occur.

These alarm signals and load cutoff signals are sent to the blade control section 12.
The alarm signal drives the corresponding relay of the alarm relay section 8 to control the corresponding loads 10-1 to 10-n. Further, the load cutoff signal drives the corresponding relay of the control relay section 7 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 when the loads to be controlled are scattered over a long distance or the locations where demand alarms are sent are dispersed, it is possible to connect individual load control power lines from this device. It is necessary to do some wiring, especially if the wiring distance is long, and the construction cost is much higher than that of a demand control device. In addition, there are problems such as the cost being relatively high compared to the required functions because the number of load points to be controlled is small, or there are additional functions that are not required by customers who do not require load control or demand alarm output. Unfortunately, there was a request to somehow make it cheaper, even if it meant cutting out unused features.

This invention was made to solve the above-mentioned problems, and by separating the main unit, alarm unit, and control unit, each device can be placed and installed in a desired location, and even after installation. It is an object of the present invention to provide a demand control device that can easily change an alarm unit to a control unit or vice versa.

[Means for solving problems]

The demand control device according to the present invention includes a base unit,
The alarm unit and control unit are separated and independent, each device has a built-in signal transmission section, these devices are interconnected using dedicated signal lines, and address signals are transmitted between them and the base unit through cyclic time-division multiplex transmission. , and is configured to transmit and receive various data such as control signals, and each of the above units is provided with an address setting section for sharing each unit. 1. [Function] The main unit and alarm unit of the present invention Since the control unit is configured as a separate and independent device, it can be placed and installed in any location as required, and the unit configuration can be assembled as required. Additionally, any unit can be selected by changing the address settings.

〔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, 20o 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.
12 time limit section 102. It is composed of a setting section 1049, a display section 105, and a signal transmission section 106.

The alarm unit 200 and the control unit 300 include signal transmission sections 202 and 302, and arithmetic processing sections 203 and 30, respectively.
3. Address setting section 204, 304, output control section 205
, 305, an alarm relay section 206, and a control fill relay section 306, and loads 401 to 40n and 501
~50n are connected.

Next, this invention will be explained in detail. The base device 100 is a central unit of this device, and receives and counts the transmitted pulses from the power meter 2 with the transmitting device at the input control section 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 calculation 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 is the target set in the setting unit 104. It is determined whether or not the demand value is exceeded, and if the demand value is exceeded, a first alarm signal is generated.

Further, the regulated power is calculated based on the predicted value, and if the calculated regulated power value exceeds the cut-off power value set in the setting unit 104 when the first alarm occurs, a second alarm signal is generated. At the same time, a load shedding signal is generated.

These calculation results and alarm signals are displayed on the display unit 105. Further, these data are converted into a predetermined transmission signal by the signal transmission section 106 and outputted to the 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 arithmetic processing unit 203 reads its own address set in the address setting unit 204, determines whether the transmitted signal is given to its own address, and determines whether the transmitted signal is given to its own address or not. If so, a signal is output to the output control section 205 according to the content, and the corresponding relay circuit of the alarm relay section 206 is driven, thereby controlling the corresponding loads 401 to 40n connected thereto.

Next, the terminal 301 of the control unit 300 is connected to the signal line 132.
The signal transmission section 302, the arithmetic processing section 303, the address setting section 304, the output control section 305, and the control section 306 are respectively corresponding parts of the alarm unit 200. A similar operation is performed in response to the above, and the corresponding loads 501 to 50n connected to the control relay section 306 are controlled in accordance with the signal transmitted from the main unit 100. In addition, since each of the above units is provided with address setting sections 204 and 304, each unit can be shared, such as an alarm unit to a control unit, or vice versa, and by setting this address, it is possible to units can be selected. Furthermore, if there are a plurality of units, it is possible to easily deal with changes in multiple control circuit numbers by changing address settings.

Note that the transmission is converted into a serial signal by the signal transmission sections 106, 202, and 302, and the baseband -? It can be put on the signal lines 131 and 132 after being adjusted to f-key. 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. This transmission is carried out by sequential polling from the master unit 100 to so-called slave units (hereinafter referred to as slave units) such as the alarm unit 200 and control unit 300.
It is used to send and receive necessary commands and data by calling .

First, address word 601 is sent out.

This address word 601 is used to identify which slave device the base unit 100 is transmitting to, and the slave unit that matches the settings in the address setting sections 204 and 304 of the slave unit is the destination of the transmission. becomes.

Next, control word 602 is sent out.

This control word 602 is a code of a command indicating 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: a control operation mode and a data length specification mode. You can decide.

In other words, when the handset is to perform some kind of control (goods), for example, a specific code is made to correspond to a certain control operation, and when the handset receives that code, it decodes the code and makes it respond in advance. Make it work.

The data length designation mode is used to designate the data length to be transmitted when communicating data with a slave device, and designates how many bytes a data word has, which will be described later. For example, when this code is OOH, the data is 0 bytes, when this code is OLH, the data is 1 byte, when this code is 021(, the data is 2 bytes, and the same goes for 08H). The data length is 8 bytes.

Next, the first sum check word 603 is sent out, but
This first sum check word 603 is a value obtained by adding the codes of the previous address word 601 and the control word 602, and is used to check for errors that may occur during transmission. On the receiving side, the address word 601 and the received code of the control word 602 are added together, and the value and the first sum check word 60 are
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 sent out.

These data words 610 to 617 are data sent and received when data is transmitted between the base unit 100 and the slave unit, and are transmitted when the aforementioned control word 602 is a code corresponding to the data length specification mode. That is, for example, when the control hood 602 is at 03H, the data word consists of 3 bytes of 610°611.612, and when the control hood 602 is at 05H, the data word consists of 610, 611,
It consists of 5 bytes of 61.2°613.614.

A second sum check word 618 is added to the end of data words 610-617 and transmitted.

This word adds all the codes of the address word 601, control word 602, first sum check word 603, and data words 610 to 617, and uses the addition result excluding overflows as the second sum check word 618. Send. This second sum check word is also for checking transmission errors in the same way as described above, and the operation on the receiving side is the same as that for the first sum check word 603.

FIG. 3 H address word 601. control word 6
02. In the time chart of the word structure of the first sum check word 603, for example, the address word 601 first has a start pitch 601a, and then a signal pitch 601a.
01b are lined up, and a stop bit 601c is added at the end.

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

Among these, the last bit is a parity bit 601d for error checking. Finally, there is a stop 601c.

Not only the control word 602 and the first sum check word 603 but also the data words 610 to 617 and the second sum check word 618 have a similar bit structure.

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 pit for each word. In other words, base 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 it is a signal given to itself or not using address word 6.
Decipher 01 and make a decision.

Furthermore, the parity pit and the first and second sum check words 603 and 618 are checked, and if an error is detected in this check, no operation is performed and a retransmission of the signal from the base unit 100 is waited for. 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 again to the corresponding slave device. 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, a 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 each 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 them.

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, a setting means or a 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, inputting the number of connections using a keyboard, etc., and storing it in an internal memory circuit. Possible 3゜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. By configuring the device to remember the address of the slave device, there is no need for a setting method.
You can also do it like this.

〔Effect of the invention〕

As described above, according to the present invention, the base unit, the f-report unit,
Since the control unit is configured as an independent and separate device, wiring work can be done easily and inexpensively when the load to be controlled or the locations where alarms are notified are far away or distributed, making it easy to connect each of the above units. Can be placed where you need it. Furthermore, since the alarm unit and control unit can be selected as needed, a configuration matching the required functions can be assembled, and waste can be eliminated in terms of function and price.

Furthermore, since each unit is provided with an address setting section, each unit can be shared, and any unit can be selected by simply setting this address. If there are multiple units, changes in control circuit numbers, etc. can be easily handled by changing address settings. Furthermore, transmission errors are checked by adding a parity check to each word, a first sum check word to the address and control words, and a second sum check word to all transmitted data to ensure transmission reliability. Since the structure is configured to increase the transmission rate, it is possible to maintain 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. 2 is a power consumption meter with a transmitter, 100 is a base unit, 103 is an arithmetic processing unit, 106 is a signal transmission unit, 200 is an alarm unit,
202 is a signal transmission section, 204 is an address setting section, 205
is an output control section, 206 is an alarm relay section, 300 is a control unit, 304 is an address setting section, 131, 132, 1
33, 134, 135 are signal lines, 700 is a data input unit, 800 is a remote control unit), and 900 is a remote display unit. Patent applicant: Mitsubishi Electric Corporation (2 others)
°C Nodo Figure 5

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 set in advance. an arithmetic processing unit that generates and displays a second alarm signal and generates and displays a load shedding signal when the cutoff power value exceeds the specified cutoff power value; and a signal transmission unit that converts the signal output from the arithmetic processing unit into a predetermined transmission signal and outputs the signal. a base unit having a base unit; a signal transmission unit that receives the signal transmitted from the base unit and receives and demodulates the alarm signal at a preset address, outputting a signal to the output control unit according to the content thereof; an alarm unit that controls the load in an alarm relay section; and a control unit that receives the signal transmitted from the base unit, receives and demodulates the load shedding signal at a preset address, and performs the same operation as the alarm unit. The base unit and each unit are interconnected by signal lines, and address signals and alarm signals are transmitted between the base unit and each unit by cyclic time-division multiplex transmission. , a demand control device configured to transmit and receive a control signal and a return signal, and further comprising an address setting section for sharing each unit in each of the units.