JPH0145817B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a demand control system that controls a load in accordance with a signal output from a demand control device, in which a production load is continuously controlled by a command signal and a control amount signal transmitted from a transmitter. The present invention relates to a production load receiver that is controlled automatically.

The demand control device is designed to prevent the power consumption during the demand period from exceeding the contracted maximum demand power, and calculates the predicted value from the current value of the power consumption, the sampling value, and the remaining time, and calculates the predicted value. If it does not match the target value, the amount of decrease or increase in load (referred to as adjustment amount) required to make the power usage match the target value at the end of the demand time period is calculated. Conventionally, the load to be controlled according to the amount of adjustment from a demand control device was almost always a load that could be turned on and off, but production loads that cannot be turned on and off can now be controlled continuously or in stages. It is being considered. on the other hand,
The production load changes in relation to the daily production plan, and the operating conditions change, and it is not always possible to operate at full load every day.
You may drive at 80%, 50%, etc. Therefore, when controlling the production load according to the demand control signal, it is desirable to set an operating target value for each production load, and to return the current value of the production load to the operating target value when entering a new demand time period. . In order to meet these demands, we set operating target values for each production load according to the production plan, and also set the current value of each production load to match the operating target value when entering a new demand period. A load control device has been filed on the same day by the same applicant.

When the positions of multiple production loads are far from each other, this production load control device has one transmitter installed close to the demand control device and multiple receivers installed close to each production load. It has come to be composed of a vessel,
Since the operating target values for multiple production loads are set using a transmitter, an operator near the production loads cannot set the operating target values on the spot, which can be inconvenient. In addition, when entering a new time period, a call command signal, a setting command signal, and an operation target value signal must be sent to each production load receiver, which takes time to return to the operation target value, and the demand control device This is undesirable because it may affect the next command signal.

An object of the present invention is to be able to set an operation target value on the production load side, and when entering a new demand time, to restore the current value of the production load to the operation target value all at once by a return command signal from a transmitter. It is an object of the present invention to provide a receiver for production load of a demand control system that can be used for production loads of a demand control system.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a demand control system according to the present invention, in which among the loads L ₁ to _{L o} to be controlled, loads L ₁ to L ₃ ,... are loads that can be turned on and off;
Load L _o-1 , L _o is a production load that cannot be turned on or off. Electric power is supplied to each load via the transaction transformer 1, the voltage transformer 2, the transformer TR, the shield breakers CB ₁ to CB _o , and the transformers TR ₁ to TR _o . Load L ₁
The amount of power used for ~L _o is measured by a power meter 3 with a transmitter. The watt-hour meter 3 with a transmitting device emits a pulse with a frequency proportional to the electric power, and while this pulse is sent to the demand wattmeter 4, it is detected by a pulse detector 5, and is amplified and shaped by a pulse converter 6. , is input to the demand control device 7. The demand control device 7 measures the current value by integrating the input pulses, and also measures the sampling value from the number of pulses within a sampling time (for example, 1 minute), and calculates the current value, sampling value, and demand time limit (for example, 30 minutes). The predicted value at the end of the demand time period is calculated from the remaining time (minutes), and the amount of load adjustment necessary to make the power consumption at the end of the demand time period match the target value is calculated. The demand control device 7 outputs a decrease command signal or an increase command signal together with an adjustment amount signal when it is necessary to decrease or increase the load. It also constantly outputs a remaining time signal. The demand control signal from the demand control device 7 is input to the transmitter 8 . The transmitter 8 is an on/off receiver provided for each of the loads L ₁ to L ₃ , which can be turned on and off.
RV ₁ to RV ₃ , . . . and analog receivers RV _o -1 and RV _o provided for each production load L _o-1 and L _o constitute a load monitoring control device 9. Analog receiver RV _o-1 ,
RV _o corresponds to the production load receiver of the present invention. The receivers RV ₁ to _{RV o} are connected to the transmitter 8 by two common transmission lines. Analog receiver RV _o-1 ,
RV _o is the production load via controllers RG _i-1 , RG _i , etc.
Control L _o-1 and L _o .

FIG. 2 shows the configuration of the transmitter 8. t ₁ is a terminal into which the demand control signal from the demand control device 7 is input, t ₂ is an on/off receiver RV ₁ ~
These are terminals for inputting and outputting signals to and from RV ₃ , ... and analog receivers RV _o-1 and RV _o .
The numeric keypad switch section 10 is a numeric keypad 1 from 0 to 9.
1, an all-clear key 12 and an increment key 13. The command switch unit 14 includes a load capacity key K ₁ , a control method key K ₂ , a control order key K ₃ ,
It consists of a write key _K4 , a monitoring key _K5 , a simultaneous off key _K6 , an individual off key _K7 , an individual on key _K8 , and a start key _K9 .

The operation of the transmitter 8 will be explained.

a. Initial Settings Before performing automatic control, set the conditions for the loads L ₁ to _Lo . First, the automatic/manual changeover switch 15 is switched to manual, and the receiver address number 1 is selected using the numeric keypad 11. At this time, 1 is displayed on the receiver address display 17 of the display section 16.
If the on/off receiver RV ₁ is assigned to address 1, the load capacity, control method, and control order are set by operating the numeric keypad switch section 10 and the command switch section 14, and the load capacity display 1 is assigned.
8. Control method indicator 19, control order indicator 20
and stored in the setting condition memory 21. Receivers assigned to addresses 2 and onward RV ₂ ~
RV _o is also set and memorized in the same way.
The control order of the production loads L _o-1 and L _o is set lower than the control order of the loads L ₁ to _{L 3} , . . . which can be turned on and off.

With the automatic manual changeover switch 15 set to manual, display the receiver address on the receiver address display 17 using the numeric keypad 11, and press the monitor key _K5 to display the receiver RV 1 to RV ₁ for each address.
RV _o is called sequentially and on-off receiver RV ₁ ~
Regarding RV ₃ , . . . , the on/off status, whether or not there is an abnormality, and whether or not the load is in a state where automatic control is rejected are displayed on the receiver status display 22 and stored in the setting condition memory 21. Regarding the analog receivers RV _o-1 and RV _o , the current values are displayed on the current value display 23 instead of the on/off state and are stored in the setting condition memory 21. Also, when switching from manual to automatic, all receivers RV ₁ to _{RV o} are automatically monitored and stored in the setting condition memory 21 according to the control order.
is memorized. The battery 24 is used to retain the contents of the setting condition memory 21 even in the event of a power outage.

b. When a reduction command signal is input When automatic control is performed by the signal from the demand control device 7, the automatic/manual changeover switch 15 is switched to automatic. When a reduction command signal and an adjustment amount signal are input from the demand control device 7, the demand control signal receiving section 25 receives these signals through the interface 26.
is sent to the arithmetic processing unit 27 via the arithmetic processing unit 2.
7 discriminates these signals. First, it is checked whether or not the control was performed within one minute, and if the control was performed within one minute, nothing is done. If control is not being performed, a monitoring command signal is sent from the signal transmitting/receiving unit 29 to all the receivers RV ₁ to _{RV o} via the interface 28, and the latest receiver status (on/off status, abnormality or not) is sent. , whether the automatic control is rejected, the current value of the production load)
Return from RV ₁ to RV _o , setting condition memory 2
Store it in 1.

The stored contents of the setting condition memory 21 of the on-off receiver having a higher control order are read out to confirm that the on-off receiver is normal, can be automatically controlled, and is turned on. If any one of these conditions is not met, that on-off receiver is skipped and the process moves to the next on-off receiver in the control order. After confirmation, the arithmetic processing unit 27
calculates by subtracting the load capacity of the on-off receiver from the adjustment amount, and if there is a surplus of adjustment amount, subtracts the load capacity of the next on-off receiver. In this way, on/off receivers with load capacities commensurate with the amount of adjustment are determined, and a shedding command signal is sequentially transmitted to these on/off receivers.

If the amount of adjustment is not enough with the on-off receiver alone, or if a reduction command signal is input when all the on-off receivers are already in the off state, the analog receivers RV _o-1 and RV _o should be adjusted as follows. calculate. In other words, subtract the adjustment amount (the remaining adjustment amount if the on-off receiver alone is insufficient for the adjustment amount) from the current value obtained by monitoring, and if the remainder is greater than 0, reduce the adjustment amount. If the remainder is 0 or less, the current value is transmitted as the reduction control amount to the analog receiver.

If the amount of adjustment is too large and the number of controllable receivers is insufficient, a shrunken command signal or a reduction command signal and a reduction control amount signal are sequentially transmitted to the controllable receivers, and at the same time, they are transmitted via the interface 30. The alarm display circuit 32 is operated to notify the user that the adjustment amount could not be fully controlled.
Run it and print it out.

1 minute after taking control, all receivers RV ₁
~RV _o is monitored, the receiver status is stored in the setting condition memory 21, and printed out by the printer 33. The operations of the arithmetic processing unit 27 described above are performed according to the program stored in the program memory 34, and storage during the calculation is performed by the arithmetic memory 35. Arithmetic processing unit 27, display unit 16, and numeric keypad switch unit 10
etc., there are interfaces 36 and 37.
is provided.

c When an increase command signal is input In the same way as when a decrease command signal is input, first monitor the status of all receivers and store them in the setting condition memory 21, and first check whether the analog receiver is normal or automatic. Those that are in a controllable state and whose current value is smaller than the operating target value are selected from the lower control order, and the increased control amount is calculated. The operating target value is set according to the production situation for each production load, and is set by the operating target value setter of the analog receivers RV _o-1 and RV _o , and the details will be described later. When the difference A between the operation target value and the current value is smaller than the adjustment amount, the difference A becomes the increased control amount, and when the difference A is equal to or larger than the adjustment amount, the adjustment amount becomes the increased control amount and an increase command is issued. It is transmitted together with the signal as a control variable signal to an analog receiver. Next, select on-off receivers that are normal, can be automatically controlled, and are off according to the control order, determine on-off receivers with load capacities commensurate with the amount of adjustment, and perform on-off reception on these receivers. Send input command signals to the devices in sequence.

If the adjustment amount is too large and there are not enough controllable receivers, an increase command signal and an increase control amount signal or input command signal are sequentially transmitted to the controllable receivers and printed out. One minute after the control is performed, all receivers are monitored and their status is stored in the setting condition memory 21, and
Print out.

d Transmission of command signal to return to target operation value When the remaining time signal input from the demand control device 7 becomes zero, that is, when entering a new demand time period, the arithmetic processing unit 27 does not transmit a call command signal for each address. , a common return command signal is sent to all receivers RV ₁ to _{RV o} . Also, when switching from manual to automatic in the middle of the demand time period, a return command signal is similarly transmitted.

FIG. 3 shows a block diagram of an analog receiver. Terminal _t3 is a terminal connected to the transmission line from the transmitter 8, _t4 is a terminal that outputs an absolute quantity signal to a controller, etc., _t5 is a terminal for inputting the current value from a controller, etc., and _t6 is a terminal for production. This is a terminal to which a signal indicating the state of the automatic control rejection selection switch provided on the load or controller is input. The operation target value setter 38 sets the operation target value of the production load, and uses a digital switch, a P-ROM table, or the like. The signal from the transmitter 8 is received by the transmitting/receiving section 39, and the signal is sent to the interface 4.
0, the content of the signal is determined by the arithmetic processing unit 41. When the arithmetic processing unit 41 determines the monitoring command signal, it inputs it from the terminal _t5 , and inputs the current value converted into a digital signal by the A/D converter 42 from the terminal t6, and outputs the current value from the terminal _t6 to the automatic control rejection detection unit. 4
A signal instructing whether or not the automatic control rejection state detected in step 3 is detected is transmitted to the transmitter 8. When a decrease command signal or an increase command signal and a controlled amount signal are received, the controlled amount is converted into an absolute amount, and this absolute amount signal is converted into an analog signal by the D/A converter 44 and sent to a controller, etc. Sent. When the return command signal is received, the absolute amount is matched with the operation target value. 45 and 46 are program memories and calculation memories.

In order to explain the operation of the arithmetic processing section 41 in detail, FIG. 4 shows a block diagram when the software of the arithmetic processing section 41 is replaced with hardware. When the paging command discriminating circuit 47 determines a paging command signal that matches the assigned receiver address, the flip-flop FF ₁ is set, and the set output causes the increase command discriminating circuit 4
8. The reduction command determination circuit 49, the monitoring command determination circuit 50, and the return command determination circuit 51 become operational. When a monitoring command signal is input, the monitoring command discriminating circuit 50 determines it, and the AND gate G ₁ ,
Open _G2 . Therefore, the pure binary digital signal indicating the current value of the A/D converter 42 is converted into a binary coded decimal signal by the KW conversion circuit 52, and the AND gate _G1 and the OR gate _G3 are converted. The signal is then transmitted from the signal transmission circuit 39b to the transmitter 8. Further, the signal indicating whether or not the automatic control rejection detection unit 43 is in the automatic control rejection state is an AND gate.
G ₂ , signal transmission circuit 39b via OR gate G ₃
Sent from. When an increase command signal and an increase control amount signal are input, the increase command discrimination circuit 48 discriminates them and sets flip-flop FF ₂ , and the set output opens AND gate G ₄ and goes up and down via OR gate G ₅ . It is input to the up input terminal U of the counter 53 to set the addition mode. The count value of the up-down counter 53 indicates the absolute amount of production load. The increased control amount signal is sent to the KW conversion circuit 54.
is converted from binary coded decimal system to pure binary system and inputted to comparison circuit 55. and gate
By opening _G4 , the clock pulse from the clock pulse generation circuit 56 is output to the AND gate _G4.
and is input to the up-down counter 53 via OR gates G ₆ and G ₇ , and is input to the AND gate.
Control counter 57 via G ₄ and or gate G ₆
Enter. When the increased control amount output from the KW conversion circuit 54 and the count value of the control counter 57 match, the comparison circuit 55 converts the flip-flop FF ₂
Reset and close AND gate _G4 . Therefore, the input of the clock pulse to the up-down counter 53 and the control counter 57 is interrupted, and the counted value of the up-down counter 53, that is, the absolute amount of production load becomes the current value plus the increased control amount. Control counter 57 is reset by the output of comparison circuit 55. The absolute quantity that is the output of the up-down counter 53 is converted into an analog quantity by the D/A converter 44, and output as an absolute quantity signal from the terminal _t4 to the controller.

When the decrease command signal and decrease control amount signal are input, the AND gate _G8 is opened by setting the flip-flop _FF3 , and the up-down counter 53 is opened by inputting the set output to the down input terminal D via the OR gate _G9 . Set to subtraction mode. Therefore, the decreasing control amount is subtracted from the absolute amount of the up-down counter 53, and the decreased absolute amount is output as a new absolute amount signal. The controller controls the production loads L _o-1 and L _o by the absolute quantity signal output from terminal _t4 .

When the termination command signal is input, the termination command determination circuit 58 resets the flip-flop _FF1 ,
Increase command discrimination circuit 48, decrease command discrimination circuit 4
9. Disable the operation of the monitoring command discrimination circuit 50 and the return command discrimination circuit 51.

When a return command signal is input when entering a new demand time period or switching from manual to automatic mode in the middle of a demand time period, the return command discrimination circuit 51 passes the signal through AND gates G ₁₀ , G ₁₁ , G ₁₂
and open these. A comparison circuit 59 compares the absolute amount X of the up-down counter 53 with the operating target value Y of the operating target value setter 38, and if the former is smaller than the latter, the up input of the up-down counter ₅₃ is passed through the AND gate G11. Send a signal to terminal U to set addition mode. As a result, the up-down counter 53 adds up the clock pulses that have passed through the AND gate _G10 , and when the absolute amount matches the operating target value, the up-down counter 53 adds up the clock pulse that has passed through the AND gate G10.
Since it no longer outputs a signal, the up-down counter 53 no longer adds or subtracts clock pulses. If the absolute amount
The clock pulses are subtracted and counted, and when the absolute amount matches the operating target value, the counting is stopped.

Note that the portion surrounded by dotted lines in FIG. 4 forms a command discrimination circuit 60.

Figure 5 shows an example of the operation of the analog receiver RV _o-1 or RV _o . Each time a new demand time period begins, the absolute amount of production load changes to the operating target value 61.
Will definitely come back.

The present invention provides loads L ₁ to L ₃ , which can be turned on and off.
This applies even if there is no production load L _o-1 or L _o only. In the illustrated embodiment, analog receivers RV _o-1 and RV _o that output analog quantities are shown as production load receivers, but the controller
If RG _i-1 , RG _i or production loads L _o-1 and L _o are equipped with a D/A converter, a digital receiver that outputs a digital quantity as an absolute quantity signal is used as a production load receiver. It is also possible to do this.

As explained above, according to the present invention, each production load is provided close to each production load, and the production load is continuously controlled by signals from transmitters provided close to the demand control device. Since the production load receiver is equipped with the operation target value setting means for setting the operation target value for the production load alone, the operation target value can be set on the production load side. Further, since the operation target value return means is provided for making the absolute amount of the counter means match the operation target value of the operation target value setting means by the return command signal sent from the transmitter when entering a new demand time period,
There is no need to send the operating target value from the transmitter, and by sending only the return command signal, the current value of the production load can be returned to the operating target value all at once.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an example of a demand control system according to the present invention, FIG. 2 is a block diagram of a transmitter according to an embodiment of the present invention, and FIG. 3 is an analog receiver according to an embodiment of the present invention. 4 is a block diagram of an analog receiver according to an embodiment of the present invention in which the software is replaced with hardware. FIG. 5 is a time chart showing an example of the operation of the analog receiver. . 7... Demand control device, 8... Transmitter, 16... Display section, 21... Memory for setting conditions, 27... Arithmetic processing section, 38... Operation target value setter, 41... Arithmetic processing section, 44...D/A converter, 48...Increase command discrimination circuit, 49...Decrease command discrimination circuit, 51...Return command discrimination circuit, 53...
...Up-down counter, 55...Comparison circuit, 5
6... Clock pulse generation circuit, 57... Control counter, 59... Comparison circuit, 61... Operating target value, RV _o-1 , RV _o ... Analog receiver, L _o-1 , L _o
...Production load, FF ₁ ~ FF ₃ ... Flip-flop, G ₁ ~ _{G 12} ... Gate.

Claims (1)

[Claims] 1 A demand control device is installed in the vicinity of the demand control device, and when a decrease command signal or an increase command signal and an adjustment amount signal are input from the demand control device, a decrease command signal or an adjustment amount signal is input from the current value of the production load and the adjustment amount. A demand control system is configured together with a transmitter that transmits an increase command signal and a control amount signal to a production load receiver selected according to the control order, and is provided close to each production load, and from the transmitter. A production load receiver that continuously controls the production load by means of a signal, comprising a counter means for indicating the absolute amount of the production load, and a counter means for instructing the absolute amount of the production load, and a counter means for instructing the absolute amount of the control amount sent from the transmitter. output means for outputting an absolute amount signal output from the counter means for the production load; operation target value setting means for setting an operation target value for the production load alone; and a new demand time limit. For production load use of a demand control system, the demand control system is equipped with an operation target value return means that matches the absolute value of the counter means with the operation target value of the operation target value setting means in response to a return command signal sent from a transmitter when entering the production load control system. receiver.