JPH07231569A - Unit for determining distribution of generated power - Google Patents

Abstract

PURPOSE:To determine an optimal distribution of purchased power and power generated from a private power plant for minimizing the cost of power consumption in a short time using a simple device. CONSTITUTION:An optimal cost curve representating an optimal distribution of purchased power and power generated from a private power plant is previously determined while taking account cost and stored in a hard disc 13. An actually required electric energy is then inputted on a keyboard 11 and an optimal distribution of purchased power and power generated from a private power plant is determined with reference to the optimal cost curve stored in the hard disc 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation distribution determining apparatus for determining the optimum distribution of power purchase / in-house power generation in an industrial power plant.

[0002]

2. Description of the Related Art In the case where factory power consumption with variable power consumption is covered by both power purchase and private power generation, the conventional method compares the case where all power consumption is covered by power purchase and private power generation. , If the power purchase is cheap, the private power generation amount is the minimum, in the opposite case, the private power generation amount is the maximum distribution, or the distribution that minimizes the cost evaluation function to the power consumption is calculated. The method of seeking by was adopted.

[0003]

However, since the cost required for private power generation does not become a linear function of the private power generation amount depending on the fuel used and the number of units to be operated, the former method is not always the optimum distribution.

Further, the latter method of calculating by the convergence calculation has a problem in that the calculation requires a large amount of time and the capacity of the storage device such that a computer such as a mini computer requires several hours.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a simple device for optimal distribution of power purchase and private power generation that minimizes the cost with respect to power consumption. An object is to provide a power generation distribution determination device that can be obtained in a short time.

[0006]

That is, according to the present invention, an optimum cost curve showing the optimum distribution of power purchase and private power generation with respect to the total power consumption in consideration of cost is obtained in advance, and the actually required power amount is From the above, the optimum distribution of power purchase and private power generation is obtained by referring to the above-mentioned optimum cost curve.

[0007]

According to the above configuration, the optimum distribution of power purchase and private power generation that minimizes the cost with respect to the power consumption can be achieved with a very simple device such as a personal computer in a short time of about several minutes. It is possible to ask.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a personal computer will be described below with reference to the drawings.
FIG. 1 shows a schematic configuration of the entire apparatus. Reference numeral 11 is a keyboard (KB) for key-inputting various parameters and calculation instructions. A device main body provided, 13 is a hard disk device (HDD) as an external storage device that stores a calculation program and other fixed information in advance, and stores the result obtained by executing the calculation, and 14 displays and outputs the calculation result A CRT, 15 as a display is a printer (PRT) which prints out the calculation result.

FIG. 2 shows the processing procedure of the arithmetic operation by the apparatus of FIG. 1 having the above-mentioned structure. The arithmetic program stored in the hard disk device 13 is loaded into the memory in the main body 12 of the apparatus. With the keyboard 11, the total power consumption and in-house power generation parameters (fuel unit price, power generation efficiency, etc.)
When the unit price of electricity purchase is input and the execution of calculation is further instructed, the input of these parameters and the like is temporarily stored in the hard disk device 13, and then the program is executed in the device main body 12.

In this calculation program, the cost YGS when the above power consumption is entirely covered by private power generation is calculated and output for each power consumption as a private power generation cost calculation.

After that, the power purchase unit price CP
Based on the above-mentioned private power generation cost YGS, the minimum cost in each power consumption is sequentially calculated from the one for the minimum power consumption to obtain an optimum cost curve Y described later. During this time, the amount of power purchased and the amount of private power generation can be obtained at the same time, so the distribution can be determined.

The optimum cost curve Y and the distribution thus obtained are stored in the hard disk device 13 and displayed on the CRT 14 and printed on the printer 15. Once the optimum cost curve Y has been stored in the hard disk drive 13,
Since it is not necessary to perform the calculation output for each of the above power consumptions, the optimum distribution can be easily obtained by reloading this and giving a desired power consumption.

Next, the contents of the calculation executed by the apparatus body 12 will be described in detail. At the time of execution of calculation, first, the in-house power generation cost Y when all power consumption is covered by in-house power generation
Ask for GS. This in-house power generation cost YGS is the total power consumption obtained by adding the in-house power generation plan and power consumption to the power consumption of the factory,
It can be obtained by multiplying the fuel consumption rate of the private power generation plant, which is obtained from the power generation efficiency, by the fuel unit price.

On the other hand, the cost when all is covered by electricity purchase is the electricity generation maintenance cost (base cost) YB when the electricity generation amount is "0 (zero)", the electricity purchase unit price CP and the electricity purchase amount EP. Value obtained by multiplying by and "CP x EP + YB"
Therefore, these relationships are illustrated in FIG. In the figure, the cost in the power consumption Ek is the power consumption E at the contact position of the tangent line T of the slope CP that touches the lower side of the curve YGS.
This is the minimum when the power is covered by private power generation for j minutes and the remaining "Ek-Ej" is covered by power purchase, and the distribution value at this time is "(Ek-Ej) / Ej".

Therefore, the optimum cost curve Y connecting these points with the minimum cost is as shown by the thick solid line in FIG. FIG. 5 shows an arithmetic processing procedure for the apparatus body 12 to actually obtain the optimum cost curve Y.

That is, an initial value "1" is set for the variable i (i = 1, 2, ...), and the base cost YB is set as the initial cost for the initial value of the function Y (i) of the optimum cost curve Y. Input to the function Y (0) of the curve Y (step S
1).

Next, the calculation step width (increment) Δ of the power consumption
Substituting "E (i) -E (i-1)" as E (i) (step S2), all the increment ΔE (i) of the power consumption is covered by the power purchase, and the power consumption E at the previous time point is calculated. "Y (i-1) + ΔE (i) x CP", which is the cost when (i-1) is covered by the minimum cost allocation
And the cost YGS (i) when all the power consumption E (i) is covered by private power generation are compared (step S3).

As a result of the above comparison, the private power generation cost YGS (i)
If it is decided that the cost is lower, the lowest cost Y (i) of the power consumption E (i) is set as the private power generation cost YGS (i), and the power purchase amount EP (1) at this time is “0”, Generated power EG (1) is E (i)
(Step S4).

On the contrary, as a result of the above comparison, when it is determined that the private power generation cost YGS (i) is higher, the lowest cost Y (of the power consumption amount E (i-1) at the previous time point Y ( i-1) is the minimum cost Y (i) of the power consumption E (i), which is obtained by adding the incremental power purchase cost "ΔE (i) x CP". The value obtained by adding the increment ΔE (i) to the power consumption E (i-1) at the time, the in-house power generation amount EG (1) is the power consumption E (i-1) at the previous time.
The amount of in-house power generation EG (i-1) is kept as it is (step S
5).

After the new setting corresponding to the comparison result is executed in this way, the variable i is updated and set to "+1" in preparation for the next calculation step (step S6), and the processing from step S2 is repeatedly executed again. The optimum cost curve Y in FIG. 4 can be obtained.

However, the optimum cost curve Y thus obtained by the apparatus main body 12 is stored in the hard disk drive 13,
Thereafter, this is read out and referred to each time the calculation for determining allocation of power purchase / in-house power generation is performed.

[0022]

As described above, according to the present invention, the optimum distribution of power purchase and private power generation, which minimizes the cost with respect to the power consumption, can be achieved with a very simple device such as a personal computer for about several minutes. It is possible to provide a power generation distribution determination device that can be obtained in a short time.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an entire apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a processing procedure of calculation according to the embodiment.

FIG. 3 is a diagram exemplifying a relationship between private power generation cost and power purchase cost according to the embodiment.

FIG. 4 is a diagram illustrating an optimum cost curve according to the embodiment.

FIG. 5 is a flowchart showing the contents of calculation for obtaining the optimum cost curve according to the embodiment.

[Explanation of symbols]

11 ... Keyboard (KB), 12 ... Device main body, 13 ... Hard disk device (HDD), 14 ... CRT, 15 ... Printer (P
RT).

Claims (1)

[Claims] 1. Storage means for storing in advance an optimum cost curve showing an optimum distribution of power purchase and private power generation with respect to total power consumption in consideration of cost, input means for inputting required power amount, and this input A calculation means for obtaining the optimum distribution of power purchase and private power generation corresponding to the contents of the means by referring to the above optimum cost curve, and an output means for outputting the optimum distribution of power purchase and private power generation obtained by this calculation means. A power generation distribution determining apparatus comprising: