JPH03195335A - Demand monitor/controller - Google Patents

Abstract

PURPOSE:To enable usage of target electric energy by selecting reference power pattern data based on the date and the demand starting time and then comparing thus selected reference power data with a used electric energy. CONSTITUTION:Upon provision of a start command ST for demand monitor/ control, date C and demand starting time To are determined and a power pattern type determining means 11 determines a reference electric energy pattern QS, which is read out every moment from a reference power pattern data. At the same time, an actually used electric energy QR is operated every moment through a demand monitor/electric energy detecting means 14 and compared with QS. On the other hand, an estimated electric energy operating means 4 operates an estimated electric energy Q' every moment which is then compared with a target electric energy Q. It both conditions QR>QS and Q'>Q are satisfied, an AND gate 16 produces an output 1 and the load is interrupted. By such arrangement, load control to a target electric energy can be carried out accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a demand monitoring and control device that monitors the amount of power used within the eye at a certain time and adjusts the amount of load.

(Prior Art) Demand monitoring control is performed by an electric power consumer to adjust the amount of electric power used within the contracted amount of electric power to be used in a certain period of time. Therefore, a command signal for monitoring the amount of power used moment by moment and manipulating the amount of load is output from the time when demand monitoring control is started.

A conventional demand monitoring control system will be explained below using figures.

In Fig. 5, the solid line of curve P is the actual amount of power used moment by moment from the time when demand monitoring control is started, and the straight line S is the amount of electricity used for a certain period of time (demand time period) from the time when demand monitoring control is started. Set the target power amount to Q (KW)
h) represents the momentary reference electric energy.

The power consumption curve t is detected by integrating the power consumption ΔQ every fixed sampling time Δ.

If the integrated value of power consumption when t minutes have passed from the start of the demand period is Qt, and the sampling time Δ immediately before that is the power consumption per minute, ΔQ, then the predicted demand value that will be reached at the end of the time period TIl. (Predicted power consumption) Q'
It is represented by . The demand time limit T1 is normally set to 30 minutes.

In order to control the transition line (dotted line) of the predicted power amount Q' to the target power amount Q, it is necessary to adjust the load amount during the remaining time (TQ-t). If the power required for this adjustment (adjusted power) is U, then this adjusted power U is 0 or more (U≧0)
At this time, there is a risk of exceeding the target power amount at the end of the demant time Tu, so the load is adjusted and the power is controlled.

This determination of increase or decrease in load is performed based on the following conditions.

When the following conditions 1 to 3 are satisfied, the load is reduced (cut off).

Condition 1 Current power amount≧Reference power amount Condition 2 Predicted power amount≧Target power amount Condition 3 Adjusted power≧Load capacity Also, when the following conditions 4 to 6 are satisfied, the load is increased (turned on).

Condition 4 Current power〈Reference power condition 5 Predicted power〈Target power condition 6 Adjusted power〈O (Problem to be solved by the invention) The above conventional method is called a prediction method, and the target power amount straight line S
It is considered to be most suitable if power is used at a value close to . However, since there are various consumers, power usage is not necessarily around the standard power amount. For example, as shown by curve P in Figure 6, when the demand starts, the amount of electricity used is large.

There are some uses where the latter half is not used much.

In such a case, the load is cut off at the start of the demand,
It cannot be turned on until the load state is reached at time t2.

Therefore, there is a problem in that the targeted amount of power cannot be used as a whole.

3 [Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides an apparatus for adjusting the amount of power used in a certain period of time to bring it closer to a target amount of power by adjusting the load amount. One reference power pattern data is selected based on the date and demand start time, and the load amount is adjusted by comparing the selected reference power pattern data and the amount of power used. This is a demand monitoring and control device.

(Operation) With the above configuration, the monthly
The scheduled optimal standard power pattern data is selected from a plurality of standard power pattern data for each day of the week and two times, and the standard power amount Qs read out sequentially from this data is compared with the actual power consumption QR, and based on the results, the load A quantity adjustment command is output.

(Example) Embodiment 4 of the demand monitoring control device according to the present invention- is shown in Figure 1.

In the figure, a power amount detector 1 is a unit power amount (for example, I
A pulse signal q is output every KWh).

The counter 2 counts the pulses q and outputs the counted value ΔQ every fixed period Δt (for example, 10 seconds). The electricity meter 3 cumulatively adds the count value ΔQ of the counter 2 and calculates the amount of electricity used Q.
Display and output. When demand control is commanded, the predicted power calculation means 4 calculates the predicted power amount Q' from the count value ΔQ of the counter 2 using the conventional method described above.

In the target power setting means 5, a demand target power amount Q is set.

Comparison means 6 outputs logic signal 111 I+ when Q'>Q.

The clock 7 outputs a time signal (hours, minutes, seconds) T of a constant clock. The calendar data 8 outputs a re-calendar signal (year, month, day) C based on the time signal T.

The demand command means 9 issues a demand monitoring control start command ST.
Output.

The demand start processing means 10 receives the demand start time data T based on the start command ST. Output. This time data T. There are cases where the input time of the start command ST is used as is, and cases where a delayed time with a good predetermined interval is used.

The electric cover turn type determining means 11 receives calendar data C and demand start time data T. The pattern type data shown in the example of FIG. 2 is stored by year and month.

That is, data blocks as shown in Figure 2 are selected depending on the year and month, and weekdays, Saturdays, 9 Sundays, and days.

One of the holidays is determined, and one pattern identification data PSN is output based on the demand start time To. Addressing means 12 provides demand start time data T. From the time , address signals A and DR for reading data are output in accordance with the time signal T.

The reference power pattern data 13 selects one reference power pattern based on the pattern identification data PSN, and sequentially outputs the reference power amount Qs based on the address signal ADR.

That is, as shown in FIG. 3, the reference power pattern data 13 stores various power cover patterns C□ to On of the reference power amount Qs that are read out during a fixed time period TQ. The demand monitoring power detection means 14 calculates and outputs the amount of power used QR from the time point when the demand start command ST is input based on the count output ΔQ of the counter 2. Comparison means 15 is Q
When R>Q s, a logic signal u I IT is output.

The load amount operation command means 17 outputs a command signal for increasing/decreasing the load amount or turning on/off the load amount according to the output signal of the AND gate 16.

The effect of the above configuration will be explained using the operation example shown in FIG.

When the demand monitoring control start command ST is input, the date C and the demand start time T are input. is determined, a reference power amount pattern is determined by the power cover pattern determining means 11, and its pattern data Qs is read out from the reference power pattern data 13 every moment.

At the same time, the actual power consumption QR is calculated and output from the demand monitoring power amount detection means 14 every moment.
compared with s. On the other hand, the predicted power calculation means 4 calculates the predicted power amount Q' every moment and compares it with the target power amount Q. Then, when both the conditions Q R > Q s and Q'> Q are satisfied, the output of the AND gate 16 becomes LL.
The load becomes IIT and the load is cut off.

As a result, the load is not cut off between t□ and 1°2 as in the conventional case, but is cut off at t3, and the load can be managed accurately to the target power amount.

[Effects of the Invention] According to the present invention, it is possible to determine the reference power by classifying the past power usage status of each consumer by month, day of the week, and 9 times in advance, and the power usage status of each consumer can be determined in advance. It is possible to provide a demand monitoring and control device that can efficiently use electric power according to the amount of electric power and can accurately manage the load according to the target electric power amount.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the main parts of an embodiment of the present invention, Fig. 2 is a data structure diagram for determining the type of electric cover pattern, Fig. 3 is a characteristic diagram of reference power pattern data, and Fig. 4 is a detailed diagram of the present invention. FIGS. 5 and 6 are characteristic diagrams for explaining conventional demand control. . . . Power amount detection means 4 . . Predicted power calculation means 6.15 . . Comparison means 8 . Calendar data 10 Demand start processing 11 Electric cover turn type determination means 12 Address designation means 13 Reference power Pattern data 14...Demand monitoring power amount detection means 16.AND gate 17...Load amount operation command means.
Counter 5 Target power setting means...clock/demand command means

Claims (1)

[Claims] A device that adjusts the load amount to bring the amount of electricity used for a certain period of time closer to the target amount of electricity.It has multiple reference power pattern data for a certain period of time, and one
1. A demand monitoring and control device that selects one reference power pattern data, compares the selected reference power pattern data with the amount of power used, and adjusts the load amount.