JP7746210B2 - Self-consignment amount calculation system and program - Google Patents

Description

The present invention relates to a self-consignment amount calculation system and program that calculates the amount of electricity to be self-consigned.

As a result of the liberalization of the electricity industry, the number of new power suppliers (PPS: Power Producers and Suppliers), which are businesses that retail electricity separately from general electricity suppliers, has increased. Because new power suppliers do not have their own transmission networks to supply electricity to their customers, they supply (transport) electricity via commercial power grids, which are transmission networks managed by general electricity transmission and distribution companies.

While allowing new power suppliers to supply electricity is desirable in that it alleviates the electricity supply-demand constraints, it also poses the risk of causing instability in the commercial power grid (e.g., voltage and frequency abnormalities, large-scale blackouts, etc.). Therefore, new power suppliers are required to supply the same amount of electricity as their planned value (the amount of electricity they have announced in advance) or their customers' actual electricity demand (simultaneous balancing) per unit time (e.g., 30 minutes). Furthermore, if a new power supplier fails to meet the planned amount, the general electric utility will stabilize the power in the commercial power grid by adjusting its power generation output to compensate for the failure. In this case, the new power supplier will be obligated to pay an imbalance fee, which acts as a penalty for threatening the stability of the power in the commercial power grid. The amount of the imbalance fee is linked to the severity of the supply-demand constraints in the commercial power grid. The tighter the supply-demand constraints in the commercial power grid, the more severe the impact on the commercial power grid, and therefore the higher the imbalance fee.

In order to alleviate the tightness in the electricity supply and demand balance, it is preferable to have as many businesses as possible that can supply electricity to the commercial power grid, not just new power suppliers. For example, Patent Document 1 proposes a self-dispatch support device that supports self-dispatch, in which electricity generated by a company is supplied (dispatched) to itself or to companies with close ties to the company, thereby encouraging businesses to supply electricity to the commercial power grid.

JP 2017-163780 A

Even with self-consignment, if the amount of electricity supplied deviates from the planned value, a high imbalance fee must be paid, which is one of the reasons preventing the spread of self-consignment. The self-consignment support device proposed in Patent Document 1 is able to reduce the contracted power through self-consignment, but it is difficult to prevent the occurrence of high imbalance fees.

The present invention has been made to solve the above-mentioned problems, and provides a self-consignment amount calculation system and program that can reduce the occurrence of expensive imbalance fees.

To achieve the above objective, the self-consignment amount calculation system disclosed below is a self-consignment amount calculation system that calculates the amount of self-consignment electricity that electricity supplied to a commercial power grid by a power supply facility operated by a utility is lent to an electricity consumption facility operated by the utility or another utility belonging to the same business entity as the utility and that consumes electricity supplied from the commercial power grid. The system includes a memory unit that stores predicted tightness information indicating the predicted tightness, which is the magnitude of the supply surplus relative to demand in the commercial power grid predicted for a future unit time, and a calculation processing unit that calculates the amount of electricity to be self-consigned for a unit time before the arrival of the unit time based on the predicted tightness for the future unit time indicated by the predicted tightness information stored in the memory unit. When the predicted tightness for the future unit time indicates that the surplus is equal to or less than a predetermined amount, the calculation processing unit calculates the amount of electricity to be self-consignment for the unit time to be equal to or less than an upper limit.

The above-mentioned self-consignment amount calculation system can suppress the occurrence of imbalance charges when the supply and demand of the commercial power grid is tight and there is a high possibility that imbalance charges will become high. Therefore, it is possible to suppress the occurrence of high imbalance charges.

FIG. 1 is a conceptual diagram showing an outline of self-consignment. FIG. 2 is a block diagram showing an example of the configuration of the self-consignment amount calculation system 1 according to the embodiment of the present invention. FIG. 3 is a diagram showing an example of a method for calculating the self-consignment amount by the calculation processing unit 12. In FIG.

An embodiment of the present invention will be described below with reference to the drawings. The present invention is not limited to the following embodiment, and appropriate design changes can be made within the scope of the configuration of the present invention. In the following description, the same parts or parts having similar functions will be designated by the same reference numerals in different drawings, and repeated explanations will be omitted. The configurations described in the embodiment and modified examples may be combined or modified as appropriate. To make the description easier to understand, the configurations in the drawings referenced below are shown simplified or schematic, and some of the configurations may be omitted.

<<Self-consignment>>
First, self-consignment will be described with reference to the drawings. Figure 1 is a conceptual diagram showing an overview of self-consignment.

As shown in Figure 1, self-consignment refers to the interchange of electricity supplied by a power supply facility S operated by a specified business operator B1 to a commercial power grid P with an electricity consumption facility D that receives electricity from the commercial power grid P and consumes it. However, electricity consumption facility D is operated by the business operator B1 that operates power supply facility S, or by another business operator B2 that belongs to the same business entity as business operator B1 (for example, a group of multiple businesses that have a close relationship, such as belonging to the same corporate group or having a long-term business relationship).

When self-consignment is performed, the business operator that manages the commercial power system P (e.g., a general electricity transmission and distribution business operator) processes the settlement so that the amount of electricity consumed by power consumption facility D receiving supply from the commercial power system P is reduced by the amount of electricity that power supply facility S supplied to the commercial power system P. In addition, business operator B1 that operates power supply facility S will pay a fee to the business operator that manages the commercial power system P according to the amount of electricity it supplied to the commercial power system P through self-consignment.

Self-dispatching differs from regular wheeling, which is an electricity business conducted by new power companies and the like with the aim of pursuing profits. It is a non-electricity business aimed at the self-consumption of surplus electricity, and has the aspect of responding to public interest requests to increase the amount of electricity supplied to the commercial power grid P. Furthermore, compared to regular wheeling, which is an electricity business, self-dispatching, which is a non-electricity business, does not supply as much electricity to the commercial power grid P. Therefore, even if self-dispatching does not go as planned and fails, the degree to which it impairs the stability of power in the commercial power grid P is small.

In light of these circumstances, self-dispatching can set terms of use that are more favorable to businesses supplying electricity to the commercial power grid P than regular consignment. For example, self-dispatching can adopt a cheaper fee structure than regular consignment (for example, a completely pay-as-you-go system with no basic fee can be selected). Also, for example, with self-dispatching, the conditions for determining that a supply of electricity that satisfies the simultaneous and equal amount of electricity has failed (conditions for the obligation to pay imbalance fees) can be more relaxed than with regular consignment.

If multiple businesses perform this self-dispatch, the amount of electricity supplied to the commercial power grid P will increase, thereby alleviating the tightness of the power supply and demand balance. Furthermore, as mentioned above, the extent to which a failure in self-dispatch will harm the stability of the power in the commercial power grid P is small, so even if multiple businesses perform self-dispatch, the power in the commercial power grid P can be kept stable.

However, even if the terms of use are more favorable to operators than for regular wheeling (for example, cheaper fee structures and relaxed criteria for determining simultaneous and equal volume failures), the high imbalance fees that would be incurred are one of the reasons why operators are reluctant to introduce self-wheeling.

The self-consignment amount calculation system according to the embodiment of the present invention described below solves this problem, promoting self-consignment by suppressing the occurrence of imbalance fees, and increasing the amount of power supplied to the commercial power system P, thereby alleviating the tightness of power supply and demand.

<<Self-Consignment Amount Calculation System>>
An example of the configuration of a self-consignment amount calculation system according to an embodiment of the present invention will be described with reference to the drawings. Fig. 2 is a block diagram showing an example of the configuration of a self-consignment amount calculation system 1 according to an embodiment of the present invention.

As shown in FIG. 2, the self-consignment amount calculation system 1 includes a memory unit 11 and a calculation processing unit 12. The memory unit 11 is configured as a non-volatile storage device such as an HDD (Hard Disk Drive) or SSD (Solid State Drive), or a volatile storage device such as RAM (Random Access Memory). The calculation processing unit 12 is configured as a calculation processing device such as a CPU (Central Processing Unit). For example, the memory unit 11 and the calculation processing unit 12 are configured as part or all of a personal computer or server computer for controlling the power supply facility S. The memory unit 11 may be configured as multiple storage devices, for example, a combination of non-volatile storage devices and volatile storage devices. The memory unit 11 may also be configured as part of a server or the like located remotely from the calculation processing unit 12, and exchange information with the calculation processing unit 12 via a network such as the Internet.

The memory unit 11 stores power supply facility information, power consumption facility information, and predicted pressure information. For example, the memory unit 11 acquires and stores this information by receiving it via a network such as the Internet or by inputting it by an operator. The power supply facility information is information related to the amount of power consumed and the amount of power generated by the power supply facility S. The power consumption facility information is information related to the amount of power consumed and the amount of power generated by the power consumption facility D. The power supply facility information and the power consumption facility information may be information indicating the actual past amount of power consumed at each facility S, D, or may be information indicating a prediction of future power amount. The predicted pressure information is information indicating the predicted pressure, which is the amount of supply margin relative to demand in the commercial power system P, predicted for a future unit time. The predicted tightness is, for example, the wide-area reserve margin (the value obtained by subtracting the total demand from the total supply of the commercial power system P and dividing the difference by the total demand) published by the Organization for Cross-regional Coordination of Transmission Operators, JAPAN (OCCTO), which is an indicator used as the basis for calculating imbalance charges. Note that the predicted tightness does not necessarily need to be incorporated into the imbalance charge calculation formula, and can be any indicator that is correlated with the imbalance charge.

The calculation processing unit 12 calculates the amount of electricity to be self-consigned in a future unit time (hereinafter also referred to as "self-consignment amount") based on the power supply facility information, power consumption facility information, and predicted tightness information (details will be described later). The self-consignment amount of electricity calculated by the calculation processing unit 12 is output to the outside as output information. For example, the output information may be communicated to an operator by being displayed as text or an image on a display device, or it may be sent to an organization promoting cross-regional coordination of transmission lines, etc., and declared by operator B1 as the amount of electricity to be self-consigned.

Next, the method for calculating the self-consignment amount by the calculation processing unit 12 will be explained with reference to the drawings. Figure 3 is a diagram showing an example of the method for calculating the self-consignment amount by the calculation processing unit 12. Note that Figure 3 shows a chronological order in which time progresses from left to right in the figure.

First, the calculation processing unit 12 calculates the self-consignment amount for each unit time included in a specific target period (for example, the period from 8:00 to 24:00 on the day after the calculation date). However, here, the calculation processing unit 12 calculates the self-consignment amount for plan submission, which is a procedure required for self-consignment. Plan submission is a prior notification of the self-consignment amount for each unit time included in the target period, and must be made sufficiently before the target period (for example, a next-day plan submitted by 12:00 on the day before the target period). Plan submission is also required when selling electricity to the commercial power grid P, not just for self-consignment. Note that the self-consignment amount that has been submitted as a plan can be changed later. For example, the self-consignment amount submitted as a next-day plan can be changed by submitting a current-day plan between 17:00 on the day before the target period and one unit time.

For example, the calculation processing unit 12 calculates the amount of power that the power supply facility S can supply (reverse flow amount) to the commercial power grid P based on power supply facility information indicating the past amounts of power consumed and power generated at the power supply facility S. The calculation processing unit 12 also calculates the amount of power that the power consumption facility D receives from the commercial power grid P based on power consumption facility information indicating the past amounts of power consumed and power generated at the power consumption facility D. The calculation processing unit 12 may then calculate the entire amount of power that the power supply facility S can supply to the commercial power grid P (however, if the amount of power that the power supply facility S can supply to the commercial power grid P exceeds the amount of power that the power consumption facility D receives from the commercial power grid P, then the calculation processing unit 12 may calculate the self-consignment amount as up to the amount of power that the power consumption facility D receives from the commercial power grid P), or it may calculate the self-consignment amount so that the contracted power is reduced, as proposed in JP 2017-163780 A.

Next, after the plan is submitted, the predicted pressure level for each unit time included in the target period is announced, and the predicted pressure level information is stored in the memory unit 11. The predicted pressure level information is stored in the memory unit 11 after the plan is submitted and before the start of the target period (and further, within the deadline for changing the self-consignment volume submitted in the plan).

If the predicted tightness included in the target period indicates that the supply surplus relative to demand in the commercial power system P is below a predetermined level, the calculation processing unit 12 calculates the self-consignment volume for that unit time to be below a predetermined upper limit and outputs this as output information. As a result, the self-consignment volume for that unit time is kept below the upper limit, either by an operator who checks the output information or by sending the output information to the Organization for Cross-regional Coordination of Transmission Operators.

For example, when the wide-area reserve margin, which is the predicted tightness for a certain unit time, falls below 8%, the calculation processing unit 12 sets the self-transmission amount for that unit time below the upper limit value. Also, for example, the upper limit value is equal to or less than the amount of power that the power supply facility S can reliably supply to the commercial power system P.

As described above, if the calculation processing unit 12 calculates the self-transport amount for that unit time to be below a predetermined upper limit when the predicted tightness included in the target period indicates that the supply surplus relative to demand in the commercial power system P is below a predetermined level, it is possible to suppress the occurrence of imbalance fees when the supply and demand in the commercial power system P is tight and there is a high possibility that imbalance fees will become expensive. Therefore, it is possible to suppress the occurrence of expensive imbalance fees.

The upper limit may be a specified positive value, or it may be 0. Setting the upper limit to 0 will ensure that imbalance fees are not incurred.

Furthermore, if at least one predicted tightness during the target period indicates that the supply surplus relative to demand in the commercial power system P is equal to or less than a predetermined amount, the self-consignment amount for each of multiple unit times included in the target period may be calculated to be equal to or less than the upper limit. In this case, even if the self-consignment amount is changed by an operator, for example, a simple operation can suppress the occurrence of imbalance charges while suppressing increases in labor costs.

The above-described embodiments are merely examples for implementing the present invention. The present invention is not limited to the above-described embodiments, and can be implemented by appropriately modifying the above-described embodiments within the scope of the spirit of the present invention.

For example, in the above embodiment, an example was given of a case in which a self-consignment amount was submitted as a day-ahead plan, a predicted pressure level was acquired, and a daily plan was submitted and revised based on the predicted pressure level. However, it is also possible to simply submit a self-consignment amount based on the predicted pressure level as a daily plan without submitting a day-ahead plan.

Furthermore, in the above-described embodiment, an example has been given of a case in which the calculation processing unit 12 executes a program stored in the storage unit 11 to realize the operation of the above-described self-consignment amount calculation system 1. On the other hand, in an embodiment different from the above-described embodiment, the program may be distributed as any computer-readable storage medium (program storage medium), or may be distributed by being transmitted via a wireless or wired communication line.

Furthermore, the self-consignment amount calculation system described above can be explained as follows:

The self-consignment amount calculation system calculates the amount of self-consignment electricity that electricity supplied to a commercial power grid by a power supply facility operated by a utility is lent to a power consumption facility operated by the utility or another utility belonging to the same entity as the utility and that receives and consumes electricity from the commercial power grid. The system includes a memory unit that stores predicted tightness information indicating the predicted tightness, which is the magnitude of the supply surplus relative to demand in the commercial power grid predicted for a future unit time, and a calculation processing unit that calculates the amount of electricity to be self-consignment for a unit time before the arrival of the unit time based on the predicted tightness for the future unit time indicated by the predicted tightness information stored in the memory unit. If the predicted tightness for the future unit time indicates that the surplus is equal to or less than a predetermined amount, the calculation processing unit calculates the amount of electricity to be self-consignment for the unit time to be equal to or less than an upper limit (first configuration). This configuration makes it possible to suppress the occurrence of imbalance fees when the supply and demand balance in the commercial power grid is tight and there is a high possibility that imbalance fees will become high. Therefore, it is possible to suppress the occurrence of high imbalance fees.

In the first configuration, when the predicted tightness in at least one unit time of a target period that includes multiple unit times indicates that the margin is equal to or less than a predetermined magnitude, the calculation processing unit may calculate the amount of self-consignment electricity in each of the multiple unit times included in the target period so that it is equal to or less than the upper limit (second configuration). With this configuration, even when the self-consignment amount is changed by an operator, for example, a simple operation can suppress the occurrence of imbalance charges while suppressing increases in labor costs.

Furthermore, in the first or second configuration, if the predicted tightness for the future unit time indicates that the margin is equal to or less than a predetermined amount, the calculation processing unit may calculate the amount of electricity to be self-consigned for that unit time to be zero (third configuration). This configuration can reliably prevent the occurrence of imbalance charges.

The program used in the self-consignment amount calculation system described above also causes a computer to execute a process to calculate the amount of self-consignment power that is supplied to a commercial power grid by a power supply facility operated by a utility, and that is lent to a power consumption facility operated by the utility or another utility belonging to the same entity that receives and consumes power from the commercial power grid. The program also causes the computer to execute the following processes: obtain predicted tightness information indicating the predicted tightness, which is the magnitude of the supply surplus relative to demand in the commercial power grid predicted for a future unit time; and, if the predicted tightness for that unit time indicated by the predicted tightness information indicates that the surplus is less than a predetermined amount, calculate the amount of self-consignment power for that unit time to be less than an upper limit (fourth configuration).

1... Self-transportation amount calculation system, 11... Memory unit, 12... Processing unit, S... Power supply facility, D... Power consumption facility, P... Commercial power system, B1, B2... Operator

Claims (4)

A self-consignment amount calculation system that calculates the amount of self-consignment electricity that is supplied to a commercial power system by a power supply facility operated by a business operator and is lent to a power consumption facility that is operated by the business operator or another business operator that belongs to the same business entity as the business operator and receives and consumes electricity from the commercial power system,
a storage unit that stores predicted tightness information indicating a predicted tightness, which is the magnitude of a supply surplus relative to demand in the commercial power system predicted for a future unit time;
a calculation processing unit that calculates, based on the predicted tightness of the future unit time indicated by the predicted tightness information stored in the storage unit, an amount of power to be self-consigned at the unit time before the unit time arrives,
When the predicted tightness in the future unit time indicates that the margin is equal to or less than a predetermined size, the calculation processing unit calculates the amount of power to be self-transmitted in the unit time to be equal to or less than an upper limit value. A self-transmission amount calculation system. The self-consignment amount calculation system of claim 1, wherein, for a target period including multiple unit times, when the predicted tightness for at least one of the unit times indicates that the margin is equal to or less than a predetermined magnitude, the calculation processing unit calculates the amount of electricity to be self-consigned for each of multiple unit times included in the target period so that it is equal to or less than the upper limit. The self-consignment amount calculation system of claim 1 or 2, wherein the calculation processing unit calculates the amount of self-consignment electricity for the unit time to be zero if the predicted tightness for the unit time in the future indicates that the margin is equal to or less than a predetermined amount. A program that causes a computer to execute a process of calculating the amount of self-consignment electricity that is supplied to a commercial power grid by a power supply facility operated by a business operator and distributed to a power consumption facility operated by the business operator or another business operator that belongs to the same business entity as the business operator and receives and consumes electricity from the commercial power grid,
A process of acquiring predicted tightness information indicating a predicted tightness, which is the magnitude of a supply surplus relative to demand in the commercial power system predicted for a future unit time;
When the predicted tightness of the future unit time indicated by the predicted tightness information indicates that the margin is equal to or less than a predetermined size, a process of calculating the amount of power to be self-transmitted in the unit time so that it is equal to or less than an upper limit value;
A program that causes the computer to execute the above.