JPH04168919A - Peak limiter for power consumption - Google Patents

Abstract

PURPOSE:To limit the peak of system power consumption for each machine efficiently by detecting currents flowing through two 100V systems by means of current sensors, identifying the system connected with each machine and storing thus identified system. CONSTITUTION:Two 100V systems B, C and one 200V system A are established from single-phase three wire power line 1 through breakers Ba and Bb. Current sensors 3, 5 are arranged on the output side of the breakers Ba, Bb in order to detect currents. Outputs of the current sensors 3, 5 are connected with a controller 7 in order to decide through which system the current flows. The controller 7 is connected through a dedicated line 15 with machines 11, 12, 13... and receives the state of each machine. The controller 7 performs peak-cut based on current consumption of each system detected through the current sensors 3, 5.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention is directed to each power system in operation consisting of two systems of 100V and one system of 200V from a single-phase three-wire power line. The present invention relates to a power consumption peak value limiting device that sequentially stops devices so that the sum of power consumption of each device does not exceed a set upper limit value.

(Prior Art) Recently, 200V electrical equipment has become popular, and for this reason, it is necessary to switch from a 200V single-phase 3-wire power line to a 100V 2-wire power line so that both 200V and 100V electrical equipment can be used.
A system is used in which wiring for the system and wiring for one 200V system are performed. In this case, the amount of power consumption may be limited due to contract current, etc. In this case, as a method for limiting the amount of electric power, a breaker is often provided between the neutral wire of the single-phase three wires and the remaining two wires.

The permissible value of this brake is such that the clearance or vector wheel of the permissible value of each breaker becomes the total permissible value.

In such a wiring system, when the amount of power consumption in any of the green systems exceeds the allowable value of the breaker, the breaker is activated and the system is disconnected. Note that when the power consumption exceeds the allowable amount of power, the breaker operates to cut off the power after a set delay time has elapsed. Therefore, in order to prevent the entire wiring system from being disconnected, a current sensor is installed for each play in each system, and when the current consumption exceeds the allowable value, a so-called demand sensor is installed that turns off the equipment connected to that system before the breaker trips. There is a controller.

In order to use a demand controller in a single-phase three-wire wiring system like this, in order to know which devices are connected to the system whose current consumption exceeds the allowable value, check the wiring that connects each device to the demand controller. It is necessary to provide system data, but in conventional demand controllers, this data is provided through settings such as setting switches.

(Problem to be Solved by the Invention) As mentioned above, in conventional demand controllers, data on the wiring system for each device is provided by setting switches, so it is necessary to check each device to which system it is connected. You need to configure the switch from
The problem is that it is very time consuming and complicated. Furthermore, even if you move a device and connect it to a different power source, it is necessary to check the connected system in the same way, which is extremely inconvenient, and may cause you to check the system for each device by mistake. Or there is a problem with setting the switch incorrectly.

The present invention has been made in view of the above, and its purpose is to automatically and accurately identify the power system to which each device is connected, and to eliminate the inconvenience, effort, and complexity of the conventional methods. It is an object of the present invention to provide an efficient peak value limiting device for power consumption by eliminating errors and the like.

[Configuration of the Invention (Means for Solving the Problem) In order to achieve the above object, the power consumption peak value control device of the present invention has two systems of 100
A power consumption peak value control device that sequentially stops devices so that the sum of power consumption of each device in operation in each power system consisting of 200V and 1 system does not exceed a set upper limit value, , a current sensor that is installed in each of the two 100V power systems to detect the current consumption flowing in each of the two power systems, and a current sensor that detects the change in current consumption according to the on/off state of each device connected to each power system. Detected by a current sensor,
The gist of the present invention is to have an identification means for identifying the power system to which each device is connected, and a storage means for storing the power system for each device identified by the identification means.

(Function) In the power consumption peak value limiting device of the present invention, the power consumption is stored separately.

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is an overall configuration diagram of a power consumption peak value limiting device according to an embodiment of the present invention. As shown in the figure, from the single-phase three-wire power line 1 to the breaker Ba and the breaker Bb
Wiring for two systems B and C of 100V and one system A of 200V is formed through the wiring. In addition, breakers Ba and B are installed between the neutral wire of the single-phase three-wire wire and the other two wires.
The vector or scalar sum of the allowable power amount of b becomes the entire allowable power amount.

In addition, various electrical devices are connected to the power lines of each system, and specifically, as shown in the figure, equipment 11 and equipment n are connected to the 100V system C, and to the 200V system A. The device 12 is connected to the 100V system B, and the device 13 is connected to the 100V system B.

On the output side of the breakers Bb and Bb, there are two wires other than the neutral wire.
Current sensors 3 and 5 are provided on the line, respectively, so that the current sensor 3 detects the current flowing in the 100V system B, and the current sensor 5 detects the current flowing in the 100V system C. 3 and 5 can also detect the current flowing in the 200v system A. That is, when only current sensor 3 detects a current, this current is a current flowing to system B, and when only current sensor 5 detects a current, this current is a current flowing to system C, When both current sensors 3 and 5 detect a current, it can be seen that this current is a current flowing to system A.

The outputs of the current sensors 3 and 5 are connected to a control device 7,
This allows the control device 7 to identify which system the current is flowing through. In addition, the control device 7 is connected to each device 11, 12, 13, . It is now possible to receive the status of Note that this dedicated line 15 may be a wireless line, a power line carrier, a pass line, or the like.

Fig. 2 is a diagram showing data held by the 1IIS device W7 shown in Fig. Confirmed system information indicating whether each device is in peak cut mode, and peak cut information indicating whether or not each device is in peak cut mode are provided.

Next, the operation will be explained with reference to the flowcharts shown in FIGS. 3(a) to 3(j). The processes in FIGS. 3(a) to 3(j) are connected by branch codes .

First, as shown in FIG. 3(a), in the initialization process, various flags possessed by the control device 7 are cleared (step 101). These flags include a confirmed flag indicating whether the wiring system to which each device is connected has been confirmed, and a flag indicating that each device is undergoing peak cutting, and these flags are cleared.

Next, the control device 7 calculates the electric power Poa from the output of the current sensor 3 on the breaker Ba side and the output of the current sensor 5 on the breaker Bb side based on the current consumption of each system detected by the current sensors 3 and 5. The power amount Pob is measured (step 102). And each of these measured electric power P
It is determined whether oa and Pob exceed the allowable power amount of each breaker Ba and Bb (step 103).

As a result, if the power amount Poa exceeds the allowable power amount of breaker Ba, proceed to branch ■; if the power amount Pob exceeds the allowable power amount of breaker Bb, proceed to branch ■
If the power consumption Poa is less than the level required to restore the equipment undergoing peak cut in the wiring system on the breaker Ba side, proceed to branch If the power consumption is below the level at which the peak-cut equipment in the grid can be restored, proceed to branch ■; otherwise, return to step 102 via branch ■ to measure the electric energy. I do.

As a result of the determination in step 103, the power amount POa
exceeds the allowable power amount of breaker Ba, the process proceeds to the process shown in FIG. 3(b) via branch ■, and first, 2
00V (7) System A, 100V system B, and devices with low priority among operating devices whose system is unconfirmed n
is selected, sets the peak cut flag of this device n, and transmits an off signal to this device n (step 201). Then, it is determined whether the wiring system of this device n has been confirmed or not (step 202), and if it has been confirmed, the process returns to step 102 via branch ■, but if it has not been confirmed, a timer is started. Let (Step 2)
03), electric energy Pla from the output value of each current sensor 3, 5
and Plb are measured (step 204), and the measured power amount is compared with the power amount Pob to determine whether there has been a change (step 205).

As a result of this judgment, the electric power P1g measured by the current sensor 3
changes smaller than the electric power Poa, and the electric power P1b measured by the current sensor 5 changes to a smaller value than the electric power Poa.
If the change is smaller than b, that is, if the electric energy measured by both type flow sensors 3 and 5 is changing, the device n belongs to system A, so branch [Co., Ltd.]
If the electric power Pla measured by the current sensor 3 changes smaller than the electric power POa, the device n belongs to the system B, so proceed to branch (3) and measure the electric power by the current sensor 5. If the calculated power amount Plb changes to be smaller than the power amount POb, the device n belongs to the system C, so proceed to branch ■; otherwise, branch Proceed to FIG. 3(d) to determine whether or not the timer has exceeded (step 301). If the time has not exceeded, proceed to step 201) via branch ■.
4, each current sensor 3, until the time is over.
Changes in the amount of power are monitored from the value of 5, and if the time has elapsed, the timer is stopped and the process returns to step 102 (step 302).

As a result of the judgment in step 205, both types of flow sensors 3 and 5
If the measured power amount changes, the process proceeds to Fig. 3(e) via the branch [share], determines that device n belongs to system A, and changes the system of device n to system A. , and set the system confirmed flag for device n (
Step 4o1).

Then, the timer is stopped and the process returns to step 102 (step 402).

Furthermore, as a result of the determination in step 205, the current sensor 3
If the electric energy Pla measured at
), device n is determined to belong to system B, the system of device n is registered as B, and the system confirmed flag of device n is set (step 501).

Then, the timer is stopped and the process returns to step 102 (step 502).

Furthermore, as a result of the determination in step 205, the current sensor 5
If the power amount Plb measured at
), device n is determined to belong to system C, the system of device n is registered as C, and the system confirmed flag of device n is set (step 601).

In this case, since device n is a device connected to breaker Bb that does not need to be turned off, the peak cut flag of device n is cleared, and an on signal is sent to device n to activate it (step 602). The timer is stopped and the process returns to step 102 (step 603).

Furthermore, as a result of the judgment in step 103, the electric power Pob
exceeds the allowable power amount of breaker Bb, the process proceeds to step 3-(h) via branch (■), and the 200V
For each device connected to the 100V system A, 100V system C, or an unconfirmed system, the above-mentioned Figures 3(b) to 3.
A peak cut process similar to the process shown in FIG. 7(g) is performed, and the process returns to step 102 (step 701).

Furthermore, as a result of the determination in step 103, the electric power Poa
If the power consumption is below the level required to restore the equipment undergoing peak cut in the wiring system on the breaker Ba side,
Proceed to the process shown in Figure 3 (L) via branch ■, and proceed to step 200.
Among system A of ■, system B of 100V, and devices whose system is unconfirmed, select device m that is currently undergoing peak cut with the highest priority, clear the peak cut flag of this device m, and turn on device m. A signal is transmitted to activate device m (step 801). Then, return to step 102.

Furthermore, as a result of the judgment in step 103, the electric power Pob
If the power consumption is below the level required to restore the equipment undergoing peak cut in the wiring system on the breaker Bb side, then
Proceed to the process in FIG. 3 (j) via branch ■, and proceed to step 200.
Among V system A, 100V system C, and devices whose system is unconfirmed, select device m that is undergoing peak cut with the highest priority, clear the peak cut flag of this device m, and turn on device m. A signal is transmitted to activate device m (step 901). Then, return to step 102.

In the above embodiment, the devices are turned on/off according to the increase in power consumption, but it is of course possible to switch the power consumption of the devices instead. .

[Effects of the Invention] As explained above, according to the present invention, the current flowing through each of the two systems of 100 cm is detected by a current sensor, and the system to which each device is connected is identified and stored. Therefore, the system for each device can be properly and efficiently identified, and it does not take time and effort as in the past, and there are no errors in investigation or switch settings.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a power consumption peak value limiting device according to an embodiment of the present invention, and FIG. 2 is a diagram showing data possessed by a control device used in the peak value limiting device of FIG. 1. , FIG. 3 is a flowchart showing the operation of the peak value limiting device of FIG. DESCRIPTION OF SYMBOLS 1... Single-phase 3-wire power line, 3.5... Current sensor, 7... Control device, 11-n... Equipment, Ba, Bb... Breaker.

Claims (1)

[Claims] Two systems of 100V and one system of 2 from single-phase 3-wire power lines
A power consumption peak value limiting device that sequentially stops devices so that the total power consumption of each device in operation in each power system consisting of 00V does not exceed a set upper limit,
A current sensor is provided in each of the two 0V power systems to detect the current consumption flowing in each of the two power systems, and the current sensor detects the change in current consumption according to the on/off state of each device connected to each power system. A power consumption measuring device characterized by having an identification means for detecting with a sensor and identifying the power system to which each device is connected, and a storage means for storing the power system for each device identified by the identification means. Peak value limiter.