JPS6395818A - Selective load cut-off controller - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a central supervisory control system, and particularly to selective load cutoff control.

(Prior Art) In conventional selective load cutoff control, the load is cut off when the power consumption exceeds the capacity of the generator, according to a predetermined order of cutoff prices.

However, with conventional equipment, the load to be cut off was determined according to the priority order, so the load was cut off regardless of the power usage of the load with the highest priority and the power usage of the next priority load. I was overdoing it. In addition, the priority order of loads to be cut off is fixed at the time of system planning.

When preventing an important load from being cut off, the operator would put the load in on-site mode in advance, and the receiver would not be turned on even if a control command was output by automatic control.

(Problem to be solved by the invention) With conventional technology, the load is cut off too much.

The operating efficiency of the system was not very good. Also.

Changing the priority order or prohibiting the shutoff of two important loads is extremely troublesome for the operating operator.

The purpose of the present invention is to perform load shedding according to the capacity of the 9 generator using 9-selective load shedding control, prevent excessive load shedding, and set the 9-selective load shedding priority to prohibit the 9- important loads from being cut off. .

It is an object of the present invention to provide a selective load cutoff control device that improves the operating efficiency of a system and can flexibly respond to operational forms.

[Structure of the invention]

(Means for Solving the Problems) The selective load cutoff control device according to the present invention provides a system for supplying power from a nine-generator system when power cannot be supplied from the power purchasing system. A means for determining the load to be cut off when the output capacity is exceeded, a means for setting the priority of the load to be cut off, and a means for setting the priority of the load to be cut off, and 9. If you want to avoid cutting off important loads,
Cutting off that load is prohibited. It is equipped with a cutoff prohibition setting means, a means for inputting an analog value of the power of the electric system and a change in the running/stopping state, and a cutoff output means for cutting off the load. This system prevents overloading, changes priorities, and prohibits shutting off of important loads, thereby improving operational efficiency and making it possible to respond flexibly to operational patterns.

(Function) The feature of the means for determining the load to be cut off when the power consumption exceeds the output capacity of the generator is that in the first step, in order to prevent excessive cutoff and minimize the load to be cut off,
As in the past, the load to be cut off is selected according to the cutoff priority order.In the next step, the loads up to three times before the last load selected are considered to have the same priority, and loads that do not need to be cut off are cut off. It is characterized by a method of selecting the minimum necessary load by excluding it from the target. The priority order and cutoff load prohibition/permission setting means are provided by the CR7 display device 3 and operation keyboard 4 shown in FIG.

Settings can be made with simple operations and can be flexibly adapted to the system operation format.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

The configuration of the embodiment is shown in FIG.

FIG. 1 is a diagram showing a schematic configuration of the device of the present invention.

The configuration of each part will be explained below. 1 is a CPU (central processing unit VT), and a storage device 2.1 stores various data.
CR7 display device used for displaying and setting various data 3. A process output device 5 is connected to an operation keyboard 4, etc., and is used for transmitting and receiving signals with each part. Process input device 6
have. The process input device 6 inputs the analog value of the power of each load and the analog value of the power of the generator in the operating state 9 to the CPU 1. The various input data are displayed on the CRT display device 3.Based on the input data, the CPU 1 determines the load to be cut off.

A load cutoff output is performed through the process output device No. 5.

Next, the operation will be explained with reference to the flowchart shown in FIG. The operating status of the power purchasing power system input from the process input device 6 shown in FIG. 1 is checked.

It will be checked whether electricity cannot be supplied or not. (Step 1
) Input the total power of the load (Step 2) Input the generator power and setting value (Step 3)
), calculate the total power of the load (Step 4) 6 Next, calculate the cutoff priority and load cutoff prohibition set using the CRT display device 3 and the operation keyboard 4 shown in Figure 1.
Determine the load to be cut off by permission. (Step 5)
The determination flowchart is shown in FIG. 3 and will be explained.

Set the initial value 1 to the index ball for full load check (step 1).The total load power calculated in step 4 of Figure 2 is the generator power setting input in step 3 of Figure 2. If the total power of the loads exceeds the power setting value of the generator, select the i-th load (step 3), where the i-th load Checks whether the shutdown is permitted (step 4), and if the shutdown is permitted, subtracts the i-th load power from the total power of the loads (step 5).
, If shutoff is prohibited, the i-th load selected in step 3 is excluded from the control target (step 6).Here, return to step 2, and if the total power of the loads is 9! Search for a load that will be cut off until the power becomes lower than the set power of the electric machine. Next, return to Fig. 2 and determine the load to be cut off again to avoid cutting off too much between the cut-off loads determined so far based on the new price order and the load cut-off prohibition/permission setting conditions. (Step 6) The determination flowchart is shown in FIG. 4 and will be explained. Since the check is performed by comparing the power of up to three loads before the last load selected in step 5, the initial value 1 is set to the index j for checking (step 1). It is checked whether the power setting of the generator will not be exceeded even if the j-th load is not cut off (step 2). If not, exclude the j-th load from the control target (step 3
)6 Next, add the power of the j-th load to the total power of the loads (step 4). If the check result in step 2 is exceeded, proceed to step 5 and use the check index j
Add 1 to .

The index, j, is checked to see if the previous three loads have been checked (step 6). If you have not checked the previous three loads yet, return to step 2.

If you have checked the previous three loads, return to Figure 2.
A cutoff output request is made for the cutoff load determined so far (step 7).

Here, the display settings of the load priority ranking and prohibition/permission will be explained as shown in FIG. As shown in FIG. 5, priority level 9M is stopped/enabled for each load.

There is a CRT screen that displays the power used. 2 While this screen is displayed, for example, if you want to set the priority of load name 52F1 from 5 to 1, select priority 5 and enter 1 from the keyboard to change the priority of 52F1 from 5 to 1.
52F3, which had the previous priority of 1, changes from 1 to 5.

Here, specific effects of the embodiment are shown in FIG.

The power setting of 6 generators is 3000KW, which is explained in terms of the priority order of each load, prohibition/permission status, and power usage.

At this time, the total power consumption of the load (total power of 52F1 to 52F9) is 4000KW, so the load for 1000KII must be cut off.Here, according to the priority and cutoff prohibition/permission settings, 52F4.52F2.52
The load to be cut off is first determined in the order of F5.52F1.52F6 so that the total cutoff load exceeds 100 OKW. In this case, the total load to be cut off will be 1350 V, meaning that an extra 1 in 350 will be cut off. Then, compare the power of the load one place before the end of the selected order.

Check whether it does not need to be shut off. In this case 5
Although it is 2F1, even if the load of 200Kil is not cut off, the total load to be cut off is 1150KV, so it is 52F1.
Can be excluded from blocking. Next 52F5
If you check the load of 500KV and do not cut off the load, the total cutoff load will be 650Kw, which is less than the 100OKV load that must be cut off, so 52F.
5 must be cut off. Next, 52F, 3 places before
Check the load in step 2, and if the load is 150V, the total cutoff load will be 100OKI/ even if it is not cut off, so it is 5.
2F2 can be excluded from the target.

As mentioned above, if only the conventional priority order is used, 3
According to the present invention, the extra V was cut off by 3 at 50 V.
It gets better just by cutting off the load.

Selective load cutoff control with good operational efficiency can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, the following effects occur.

(a) Shutoff loads selected according to priority.

In addition, by using a minimum necessary load selection method that considers the loads up to 3 selected before the last load to have equal priority and excludes loads that do not need to be cut off, it prevents too many loads from being cut off. The effect of improving the operating efficiency of the system can be obtained.

(b) If the priority is high, but you want to exclude it from being blocked this time (at a special time or day), it takes time and effort to change the entire priority. In such a case, by setting the load as a shutdown prohibition flag and excluding it from the targets of shutdown control, 1
This provides the advantage of being able to flexibly prevent critical loads from being cut off.

According to the above-mentioned 9 inventions, the load is cut off commensurate with the capacity of the generator, preventing excessive load cutting off, and setting of the priority order of the new load is performed. It is possible to provide a selective load cutoff control device that improves the operating efficiency of the system and can flexibly respond to the operation mode.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a selective load cutoff control device according to the present invention, and FIG. FIGS. 3 and 4 are flowcharts showing the operation of the present invention. FIGS. 3 and 4 are detailed flowcharts showing the method of determining the cutoff load shown in FIG. 2. FIG. 5 is a diagram showing an example of CRT display of priority order and cutoff prohibition setting. . 1...CPU central processing unit 2...Storage device 3...CRT display device 4...Operating keyboard 5...Process output device 6...Process input device Agent Patent attorney Nori Chika Yudo Hirofumi MitsumataFigure 1Figure 2Figure 3Figure 4Figure 5

Claims (1)

[Claims] In a system that supplies power from a private generator system when power cannot be supplied from the power grid, there is a method for determining the load to be cut off when the power used exceeds the output capacity of the generator. A load failure priority setting means for setting load priorities, a failure prevention setting means for avoiding failure of important loads, and an analog value and operation/stop status of electric power in the power system. A selective load shear break control device comprising means for inputting a change and a shear cut output means for shearing or cutting the load.