JP2003304642A - Power consignment management method and management system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To satisfy the restriction of 'the same time, the same amount' in power consignment, and achieve power consignment management that can improve profitability. <P>SOLUTION: The 'the same time, the same amount' restriction with respect to power consignment is satisfied by regrouping the load apparatus to which a generator facility relating to one power consignment contract supplies power and the load apparatus to which a generator facility relating to another power consignment contract supplies power (S4, S5); and further the implementation of the regrouping is selected by evaluating profitability (S6-S8). <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power consignment management method and management system for simultaneously selling the same amount of electricity between a power generation facility and a load facility connected to a power system, and more particularly, to a profit rate. For improved power consignment management.

[0002]

2. Description of the Related Art In a liberalized electric power market, a market is composed of a power generation company, a power consumer, and an intermediary (hereinafter referred to as a marketer) who mediates between them, and these members generate electric power in various forms. Be traded. The members of the market are not limited to these forms, and there are marketers who own power generation facilities and power generation companies who also serve as power consumers.

In such a power market, each of the market members acts to maximize their profit. In other words, generators try to sell electricity as high as possible,
Marketers try to buy electricity as cheaply as possible and sell it as high as possible, and consumers try to buy electricity as cheaply as possible.

On the other hand, these market members also attach importance to long-term profit stability. For example, a power producer
They tend to choose stable contracts with long-term supply and price guarantees, even when unit prices are relatively low, rather than power distribution destinations, where short-term income may be maximized but fluctuations are expected.

In response to such liberalized power trading, a method for determining the operation of a power generation facility that maximizes the profit of a power generation company has been proposed, for example, in Japanese Patent Laid-Open No. 2001-86645. According to this, it predicts multiple market prices, makes a decision to sell electricity to the market with the highest price, and decides the operation of power generation equipment to maximize profits. Further, a power purchase method for maximizing the profit on the consumer side has been proposed, for example, in Japanese Patent Laid-Open No. 2000-78747.

Generally, most of the transactions in the liberalized electricity market are called bilateral or over-the-counter transactions,
It is a one-to-one medium-to-long term contract between a power producer and a consumer, and the short-term spot market is expected to account for about 20% of all demand at most. Therefore, from the viewpoint of trading volume, it is important for market members to make good use of short-term spot markets, but it is more important to conclude optimal medium- to long-term contracts.

[0007]

By the way, a power generation company or marketer (hereinafter collectively referred to as a power generation company) is
In many cases, the electric power generated or procured by itself is sold to consumers by using the electric power system of a general electric power company (so-called electric power company). In this way, the method of selling power via the power transmission network of an electric power company is generally called electric power consignment, and a certain amount of shipping fee is paid to the electric power company. The electricity consignment contract is
Generally, there is a so-called simultaneous constraint that the contracted power generation equipment and the load equipment must be connected to the power system at one location and the power supply and demand monitored at the connection points must match within a certain allowable range. is there. That is, when the amount of power generation and the amount of consumption are the same, it is assumed that they are the same amount, and if they violate this, a certain penalty will be imposed.

[0008] Therefore, it is the most important issue for the power generation business operator in the liberalized market to make a power sale contract that can keep the same amount of restrictions at the same time, stabilize profit and maximize the profit.

However, the conventional technique has a problem in that the same amount of restrictions is not taken into consideration. In other words, in order to keep the same amount of restrictions at the same time, the power generation equipment must generate power without excess or deficiency by follow-up control in response to demand of load equipment (hereinafter referred to as demand). However, in the case of a medium- to long-term contract, the demand may approach or exceed the operational limit of the power generation facility due to reasons that could not be predicted at the beginning and circumstances of the consumer. Here, the operation restriction may be, for example, a case where a minimum load restriction is set for the power generation equipment and the power generation equipment must be stopped when the power generation output falls below this. The reason is that environmental regulations cannot be observed under a low load, and stable combustion cannot be maintained in the case of a thermal power plant.

Therefore, when the demand falls below the minimum load limit of the power generation equipment, the choice of the power generation equipment is either stop of the power generation equipment or maintenance of the minimum load. However, in any case, the same amount cannot be protected at the same time,
It is necessary to pay a penalty to the electric power company according to the difference in supply and demand, which is a large loss for the power generation company. Further, when the power generation equipment is stopped, energy loss occurs due to the start and stop.

On the other hand, in terms of power transmission, the reverse flow,
That is, if the supply amount is prohibited from exceeding the consumption amount, when a reverse power flow occurs, the breaker on the side of the power generation facility is opened and the power generation is forcibly stopped according to a command from the power company who is the system administrator. Sometimes.

[0012] A first object of the present invention is to realize a power delivery management method and a management system that satisfy the constraint of the same amount of power delivery at the same time.

Further, in addition to the first problem, the second object of the present invention is to realize a power delivery management method and management system capable of improving the profit rate.

[0014]

[MEANS FOR SOLVING THE PROBLEMS] The power transmission management of the present invention which solves the first problem is to perform load power generation at a power supply destination of a power generation facility according to one power transmission contract and power generation at another power transmission contract. The present invention is characterized in that the load equipment of the power supply destination of the equipment is recombined to satisfy the same amount of restrictions on the power transmission at the same time, which can be realized by using a computer.

That is, according to the present invention, when a power generation company consigns electric power to an electric power consumer based on a contract, by rearranging the supply and demand relationship between the power generation equipment and the load equipment related to the consignment contract, Manage power transmission to maximize returns, for example. For example, if there is a possibility that the power generation equipment of one power generation operator may be subject to operational restrictions for multiple contracts between the power generation operator and the consumer who have a medium- to long-term power transmission contract, the power generation of another power generation operator may be restricted. It is characterized by avoiding operational restrictions and reducing losses by temporarily replacing the load equipment with the power sales contract partner of the equipment.

By the way, by exchanging contract parties, the loss of one power generation company can be reduced, but the profit of another power generation company may not necessarily increase. In this case, the decrease in profit or loss or the increase in profit associated with the exchange of the contracting party is used as a source of funds to liquidate the increased profit as a whole, so that there is a merit for both parties.

Further, the power delivery management method of the present invention records fluctuations in demand of each load facility relating to a plurality of power delivery contracts, predicts demand in a certain future period, and responds to the predicted demand. The output of the power generation equipment for a certain period of time, it is determined whether the predicted output exceeds the operation limit of the power generation equipment, and if the result of the determination exceeds the operation limit, the plurality of electric power It is judged whether the operation restriction can be avoided by changing the combination of the power generation equipment and the load equipment related to the consignment contract. If the result of the judgment is that the operation restriction can be avoided, the power generation equipment related to the power transfer contract according to the reclassification. The load equipment can be recombined for the fixed period.

A second problem is that, when executing the reclassification, the profits relating to the plurality of power transmission contracts when the reclassification is executed and when the recomposition is not executed are compared, and when the profit increases, the reclassification is executed. It can be solved by doing. Further, when there are a plurality of recombinations that can avoid the operation restriction, it is preferable to select the recombination with the highest profit.
Further, it is preferable that the profit increased by the reclassification is distributed among a plurality of power generation facilities related to the reclassification.

Further, the electric power transmission contract management system according to the present invention is characterized in that the load facilities are connected in accordance with a plurality of sets of electric power transmission contracts concluded between a plurality of power generation facilities and a plurality of load facilities connected to an electric power system. Is a management system of a power transmission contract that follows and controls the output of the power generation equipment related to the contract according to the demand of the demand, recording means for collecting and recording the demand fluctuation data of the load equipment, and the demand of the load equipment. Demand prediction means for predicting demand in the future fixed period based on the fluctuation data, output prediction means for predicting output of the power generation equipment corresponding to the load equipment of the predicted demand in the fixed period, and the predicted Means for determining whether the output exceeds the operation limit of the power generation facility, and if the determination result exceeds the operation limit, the power generation facility and the load facility related to the plurality of power transmission contracts By changing the combination, means for determining whether or not the operation restriction can be avoided, and if the result of this determination is that the operation restriction can be avoided, a rearrangement command for the power generation facility and the load facility related to the power transmission contract according to the rearrangement is issued. And a rearrangement means for outputting for a certain period of time.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on embodiments. FIG. 1 shows a flowchart of an embodiment of a power delivery management method of the present invention, and FIG. 2 shows an overall configuration diagram of a power delivery system to which the power delivery management system of the present invention is applied.

As shown in FIG. 2, a plurality of systems of power generation equipment 1
0N (N = a to n) is connected to the electric power system 70 via substation equipment (not shown). Further, the load facilities 60N (N = a to n) of a plurality of systems are also connected to the power system 70 via substation facilities (not shown). The electric power system 70 is a power transmission network owned by a so-called electric power company. In the figure, thick lines indicate the flow of electric power, and dotted lines indicate the flow of information. Also, subscripts a to n in the figure
Indicates that power generation equipment and load equipment with the same subscript
It indicates that the relationship is such that a basic contract for power transmission is concluded. Although not shown, the power system 70 is connected to a power plant of a power company and load equipment of other consumers.

The electric power generated in the power generation equipment 10N is boosted by the substation equipment and output to the electric power system 70. On the other hand, the electric power consumed by the load equipment 60N is stepped down and supplied from the electric power system 70 by the substation equipment. The amount of electric power supplied from the power generation equipment 10N to the electric power system 70 is measured at the connection point AN (N = a to n) and input to the simultaneous equal amount control means 80N (N = a to n). Also,
The amount of electric power output from the electric power system 70 to the load equipment 60N is measured at the connection point BN (N = a to n) and is input to the simultaneous equal amount control means 80N via the switch 95. Simultaneous same amount control means 80N receives A
The power supply amount at the N point is compared with the power demand amount at the BN point, and the output of the corresponding power generation facility 10N is adjusted so that the difference between the power supply and the demand falls within the limited range within the set fixed time. To control. In other words, the output of the power generation facility 10N complies with the simultaneous same amount constraint that the power demands of the load facilities 60N, which are in a consignment relationship, must match within a certain limit.

On the other hand, the power delivery management system 100 is composed of a management control device 101, a database 102, and an input / output device 103, and is formed by a computer. The management control device 101 fetches the time series data of the demand amount at the connection point BN via the input / output device 103 and stores it in the database 101 as demand fluctuation data. Further, demand fluctuation factor data such as weather conditions and economic trends is fetched via the input / output device 103 and stored in the database 101. Further, the operating state data and the characteristic data of the power generation facility 10N are fetched via the input / output device 103 and stored in the database 101 as the power generation facility data. The data exchanged with the outside can be transmitted and received via the input / output device 103, for example, via a communication network such as the Internet.

Next, referring to FIG. 1, the management control device 101
The processing and control procedure in step 1 will be described. The flowchart of FIG. 1 is started every predetermined period, and in step S1, the demand DN of the load equipment 60N at the connection point BN is fetched and recorded in the database 102. Next, in step S2, load history data stored in the database 102, load variation factor data such as weather conditions and economic trends, and the current demand DN are used to load the load equipment in a future fixed period (i). 60N demand (demand)
Predict DNi. Then, in step S3, the power generation output PNi of the power generation facility 10N corresponding to each load facility 60N is based on the predicted demand Di and the current contract combination.
Predict. In step S4, it is determined whether or not the predicted power generation output PNi falls below the minimum load limit LNi of the load operation limits set for the power generation equipment, and the maximum load limit HNi.
To determine whether or not That is, it is determined whether PNi <LNi or PNi> HNi. If the determination is negative (NO), the process ends.

If this determination is affirmative (YES), that is, if the load operation limit is violated, the operation proceeds to step S5,
Extract a reshuffle plan that can replace the combination of power generation equipment and load equipment related to the basic contract. For example, as illustrated in (a) of FIG. 3, the predicted demand Dai of the load facility 60a is
Is predicted to fall below the minimum load limit La of the power generation facility 10a at time T1, the database 102 is searched to find the presence or absence of a power generation facility having a minimum load limit lower than the predicted demand Dai. And (b) of the same figure
As shown in, the minimum load limit Lb of the power generation equipment 10b is lower than the predicted demand Dai, and the demand Dbi for the power generation equipment 10b in a certain period (i) is the power generation equipment 1
When the operation restrictions Lai and Hai of 0a are satisfied,
It is possible to deal by rearranging contracts. In this case, it is preferable to use the threshold value LNs having a margin higher than the minimum load limit LN as a reference. In addition, power generation equipment 1
When there is a load such as in-house power other than the load facility 60N corresponding to 0N, the power generation output PNi is predicted in consideration of them. In this way, all recombinable plans are extracted,
If even one group of reclassification plans is extracted, it is determined that contract reclassification is possible.

If the determination in step S5 is negative, the process ends. That is, the power generation equipment 10a and the load equipment 6
There will be no response line that satisfies the same amount of 0a contract at the same time. In this case, as in the conventional case, the power generation equipment 10a is stopped or the operation is continued with the minimum load limit La.

On the other hand, if the determination in step S5 is affirmative, the process proceeds to step S6, and the profitability is evaluated for all the possible recombination plans. That is, since the power generation efficiency changes according to the change in the power generation output, and the fuel cost changes when the power generation efficiency changes, the power generation cost increases or decreases. There is also the benefit of avoiding the same amount of penalties at the same time. Therefore, the demand and supply forecast is executed for each combination of power generation equipment and load equipment after reclassification, and overall profitability is evaluated in consideration of increase / decrease in power generation costs, the same amount of penalties that can be avoided, and other income.

Next, in step S7, it is judged whether or not there is a recombination plan for improving profitability based on the evaluation in step S6, and if there is not, the process ends. If there is a recombination plan that improves profitability, the process proceeds to step S8, and the recombination plan with the highest profitability is selected. Then, the switching command is output to the switching unit 95 via the input / output device 103 based on the combination related to the recombination plan selected at the timing of the certain period (i). As a result, for example, the load equipment 60 can be provided to the simultaneous equal amount control means 80a of the power generation equipment 10a.
The demand Db measured at the connection point Bb of b is input, and the demand Da measured at the connection point Ba of the load facility 60a is input to the simultaneous equal amount control means 80b of the power generation equipment 10b, so that the power transmission contract can be recombined. Done.

As a result, the power generation facility 10a is spared from the stop or the minimum load operation, and the power generation facility 10b can follow the load reduction of the load facility 60a and simultaneously operate while satisfying the same amount of restrictions.

Further, the management control device 101 executes the subroutine S20 to perform the rearrangement for a certain period (i).
Supply-demand relationship between power generation equipment and load equipment related to recombination in
Performance data related to profits such as the amount of power generation is collected, and a clearing process is executed according to a predetermined clearing rule.

The effects of the embodiment thus constructed will be described below. For comparison, the conventional power transmission management will be described. In the case where the switch 95 is not provided in FIG. 2, for example, the power generation equipment 10a and the load equipment 60a, and the power generation equipment 10b and the load equipment 60b must be controlled in the same amount at the same time. That is, the simultaneous equal amount control means 80
a compares the electric power amounts at the connection point Aa and the connection point Ba, and adjusts the output of the power generation equipment 10a so that the electric power amounts become equal. Further, the simultaneous equal amount control means 80b compares the electric power amounts at the connection point Ab and the connection point Bb, and adjusts the output of the power generation equipment 10b so that they become the same amount.

In the case of controlling in this way, as shown in FIG. 4, the demand Da of the load equipment 60a may fall below the minimum load limit La of the power generation equipment 10a for some reason at time T1. This minimum load limit is
Outputs below this are set, for example, because environmental regulations cannot be observed, or in the case of thermal power generation equipment, combustion stability cannot be guaranteed. Therefore, the demand Da
Is below the minimum load limit La of the power generation equipment 10a,
(1) Select the actual operation I that promptly stops the power generation equipment 10a, or (2) set the power generation equipment 10a to the minimum load limit La.
You will have to select one of the actual operation II to be held in.
However, in either case, since the same amount cannot be protected at the same time, the penalty is paid according to the supply and demand difference corresponding to the shaded area (a) or (b) in the figure. On the other hand, the minimum load limit Lb of the power generation equipment 10b is lower than the demand Da of the load equipment 60a, and the demand Db of the load equipment 60b.
Is higher than the minimum load limit La of the power generation equipment 10a.

Originally, a one-year medium- to long-term power sale contract is generally concluded so as not to operate as shown in FIG. However, the situation on the consumer side often changes during the contract period, so there are cases in which a low-load operation that is not expected is forced. In such a case, the power generation equipment 10a may search for another short-term power sale destination and deal with it. However, it is difficult to find such short-term demand unless a spot market or an over-the-counter market is established. In addition, even if there is a market, there is no guarantee that the power generated by an intermediate load, which generally has low power generation efficiency, will be sold in the short-term market because the unit price is high.

The present embodiment solves such a problem. For example, a power transmission contract between the power generation facility 10a and the load facility 60a, and another power generation facility 10b and the load facility 60b.
The combination of power generation equipment and load equipment related to the power transmission contract of
It is based on the premise that it can be exchanged arbitrarily during the contract period.

That is, in the present embodiment, during normal times when there is no problem in the operation of the power generation equipment 10a, 10b, the switching device 95 causes the simultaneous equal amount control means 80a, 80b to connect the connection point Ba related to the load equipment of the basic contract. , Demand for Bb Da,
You are entering Db. On the other hand, the time T in FIG.
When the demand Da of the load equipment 60a is less than the minimum load limit La of the power generation equipment 10a as in 1 and after, the switching unit 95 causes the switch 95 to be at the connection point B according to a command from the management control means 101.
The measured value of a is passed to the same amount control means 80b at the same time, and the connection point B
It operates so as to pass the measured value of b to the simultaneous same quantity control means 80a.

Actually, the time T at which the demand of the load equipment 60a falls below the minimum output limit La of the power generation equipment 10a.
If the contracts are recombined after becoming 1, the power generation equipment 10a that is being automatically operated will have to select either stop or minimum load holding. Therefore, in the present embodiment, as described above, the judgment is made based on the demand forecast, and the power sale contract is exchanged before the value falls below the minimum output limit La. That is, as shown in FIG. 3, the minimum load limit La
A threshold value Ls is provided in the vicinity of, and when the predicted demand Dai of the load facility 60a decreases and falls below the threshold value Ls, the contract is rearranged.

As a result, the output Pa of the power generation equipment 10a is
Since the demand Db of the higher load equipment 60b changes, the operation can be continued without falling below the minimum load limit La. On the other hand, since the power generation facility 10b has a margin up to the minimum load limit Lb even for the low demand Da of the load facility 60a, normal operation can be continued.

By reconstituting the contract in this way, it is possible to avoid the loss due to the stop of the power generation equipment 10a or the minimum load holding operation. For example, compared to the case of the stop, the profit from power generation corresponding to the shaded areas (b) and (c) in FIG. 3 can be increased. On the other hand, power generation facility 1
In 0b, the output corresponding to the region (c) must be reduced, so that a loss corresponding to the power generation amount (c) occurs. Therefore,
When carrying out the contract rearrangement, the power generation facility 10a must pay a corresponding consideration to the power generation facility 10b. Even if the price is at a minimum, the power generation facility 10b is shown in FIG.
It should be the amount that can guarantee the profit if the driver can continue driving. Here, the power generation efficiency of the power generation equipment is
Generally, it is a function of output, with higher output being higher and lower output being lower. Therefore, the above non-linearity of power generation efficiency also needs to be taken into account in the above loss and profit calculation.

Here, a description will be given of the payment settlement process associated with the contract exchange performed in the subroutine S20 of FIG. The consideration associated with contract reclassification is the pre-clearing method in which a certain amount of consideration is paid when the combination is exchanged for the contract, and the actual income and expenditure during the reclassification operation are accumulated over a certain period of time, and the income and expenditure estimated if the reclassification is not performed. A post-settlement method may be considered in which the margin is calculated in comparison with the above, and the settlement is performed based on the margin. The consideration in the latter ex-post settlement method can be calculated by a relatively simple method. A possible method is to add a premium of the reclassification itself to the power generation equipment on the side of which the profit is reduced due to the contract reclassification, based on the amount that guarantees the decrease in the profit. There is a method of obtaining this premium, for example, by multiplying the profit or loss that would have occurred if the contract was not exchanged by a certain ratio.

On the other hand, for the calculation of the consideration in the former pre-clearing method, for example, a method of performing the same calculation as the post-clearing method in advance based on the output prediction can be considered. Further, since the reclassification can be regarded as an option of financial engineering, the consideration (here, the price of the contract) can be determined in advance based on the option price theory. That is, the power generation equipment 10a purchases the right to exchange the receiving contract from the power generation equipment 10b when the demand of the consumer 60a falls below the minimum load of the power generation equipment 10a with the output of the consumer 60a as a variable factor. This is a call option and the option premium can be determined based on the option pricing method of the European option.

Next, the demand forecasting method of the load facility performed in step S2 of FIG. 1 will be described. Generally, for predicting fluctuating demand and price, several methods are known, such as pattern estimation by a neural network, and statistical prediction such as multiple regression analysis and least squares estimation. These are methods for estimating a deterministic pattern. In addition to this, as a probabilistic prediction method, there is a method of modeling a demand that fluctuates with a stochastic differential equation and obtaining an expected value and variance of the demand in the future.

In step S2, the prediction demand may be calculated by any prediction method. However, the deterministic prediction method and the probabilistic prediction method handle the results differently. When using the deterministic forecast value, the relationship between the forecast value or the forecast demand curve and the threshold value may be calculated. However, when considering the probabilistic predicted value, that is, the variance in addition to the fixed value, it is necessary to evaluate the relationship between the predicted value and the value obtained by adding or subtracting a number of standard deviations to the set threshold value. There is. Dispersion also appears in the overall economic evaluation considering the dispersion of demand.

By the way, in the above-described embodiment, the processing when the power generation equipment 10N is predicted to fall below the minimum load limit and when the power generation equipment 10N is predicted to exceed the maximum load limitation will be described as an example. However, the present invention is not limited to this, and it is possible to expect an increase in profit by managing the group of power transmission contracts by managing the power transmission by the contract rearrangement processing under the following conditions. (1) When a certain power generation facility has an emergency stop (2) Regardless of operational restrictions, if the profit is expected to improve if the entire profit forecast is executed and the contract is exchanged. If the fluctuations are large, it may not be possible to keep the same amount of restrictions at the same time depending on the combination after contract reclassification. Therefore, by considering that the output difference between the power generation facilities that perform contract reclassification is within a certain range as a condition for establishing the simultaneous same-quantity control switching based on contract reclassification, it is easy to comply with the simultaneous equal-quantity constraint. Become. (Modification) The power generation facility 10N is not limited to the case where it is composed of one system of power generation devices, but can be applied to the case where it is configured to include a plurality of power generation devices arranged in parallel. In this case, a plurality of power generators may be handled as one system of power generation equipment.

In addition, the power generation facility 10N is connected to the power generation facility 1 upstream of the power transmission to the power system 70 via the substation facility.
Load equipment that consumes power internally independently of 0N (hereinafter,
It is called internal demand equipment. ), It is necessary to predict the internal demand for electricity. Therefore, the load equipment 60
Similar to the demand forecast for N, the demand forecast of the internal demand equipment is performed. Regarding the demand of the internal demand equipment, like the load equipment, the fluctuation of the demand is measured and recorded in the database 101. Then, an internal demand forecasting function is added to the management control device 101, and the same calculation as the load demand forecast in step S2 of FIG. 1 is performed. Then, the internal demand amount is added to the output of the power generation equipment 10N, and the processing from step S3 is performed. The internal demand forecasting method and record content are
This is similar to the case regarding the load facility 60N.

Further, in the embodiment shown in FIG. 1, an example has been described in which the contract rearrangement process is not executed and the power transmission based on the combination at that time is continued if the operation restriction does not matter in step S4. However, even when the operation constraint does not matter, the management method of the present invention for improving profit by contract reorganization can be applied. That is, steps S4 and S5 in the flowchart of FIG. 1 are omitted, and steps S3 to S
Proceed to step 6 to evaluate profitability for all recombination plans. Then, as in the case of the first embodiment, the combination with the highest profitability is selected, and the switching command is output to the switch 95 based on the contract reclassification for the predicted period. Also,
On the other hand, based on the reclassified contract, the subroutine S2
It goes without saying that the clearing process of 0 is performed.

[0046]

As described above, according to the present invention, it is possible to satisfy the constraint of the same amount of power transmission at the same time and improve the profit rate.

[Brief description of drawings]

FIG. 1 is a flowchart showing a processing procedure of a power delivery management method according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a power delivery system to which the power delivery management system of one embodiment of the present invention is applied.

FIG. 3 is a diagram for explaining the effect of the same amount of contract reassignment according to the present invention.

FIG. 4 is a diagram for explaining a conventional problem due to the same amount of constraint for comparison with FIG.

[Explanation of symbols]

10a, 10b, ... 10n Power generation equipment 60a, 60b, ... 60n Load equipment 70 power system 80a, 80b, ... 80n Simultaneous same amount control means 95 switch 100 Power Consignment Management System 101 database 103 I / O device

Claims (6)

[Claims] 1. A load facility at a power supply destination of a power generation facility according to one power transmission contract and a load facility at a power supply destination of a power generation facility according to another power transmission contract are recombined so that the same load related to power transmission can be performed at the same time. A power transmission management method characterized by satisfying a quantity constraint. 2. The fluctuation of the demand of each load facility relating to a plurality of power transmission contracts is recorded, the demand in a certain future period is predicted, and the output of the power generation facility corresponding to the predicted demand in the certain period. And determine whether the predicted output exceeds the operation limit of the power generation facility, and if the result of the determination exceeds the operation limit, the power generation facility and the load facility related to the plurality of power transmission contracts. If it is possible to avoid the operation restriction by changing the combination of the above, if the result of the determination is that the operation restriction can be avoided, the power generation facility and the load facility related to the power transmission contract are reconfigured according to the reconfiguration for the certain period of time. Power Consignment Management Method Performed About. 3. When performing the reclassification, comparing the profits relating to the plurality of power transmission contracts when the reclassification is executed and when the recomposition is not executed, and performing the reclassification when the profit increases. The power transmission management method according to claim 2, which is characterized in that. 4. The power transmission management method according to claim 3, wherein when there are a plurality of reclassifications that can avoid the operation restriction, the recombining with the highest profit is selected. 5. The power transmission management method according to claim 3, wherein the profit increased by the rearrangement is distributed among a plurality of power generation facilities related to the rearrangement. 6. According to a plurality of sets of power transmission contracts concluded between a plurality of power generation facilities connected to an electric power system and a plurality of load facilities, the power generation facilities related to the contract are demanded according to the demand of each load facility. A management system for a power transmission contract that controls output tracking, a recording unit that collects and records demand fluctuation data of each load facility, based on the demand fluctuation data of each load facility, in a certain future period Demand prediction means for predicting demand, output prediction means for predicting the output of the power generation equipment corresponding to the load equipment of the predicted demand in the fixed period, and the predicted output exceeds the operation limit of the power generation equipment. And a means for determining whether or not the operation limit can be avoided by changing the combination of the power generation facility and the load facility related to the plurality of power transmission contracts when the determination result exceeds the operation limit. And a rearrangement unit for outputting a rearrangement command for the power generation facility and the load facility related to the power transmission contract according to the rearrangement for a certain period when the determination result can avoid the operation restriction. Power transmission management system.