JP2009261114A - Operation program creation device of distributed power supply system, and creation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that, when creating an operation program of a distributed power supply system equipped with an accumulator in parallel, it is difficult to perform integrated management and operation since there is created an independent operation program of another dimension different from that of the other facility due to an effect that the accumulator needs refresh operation. <P>SOLUTION: An accumulator state management part and an accumulator refresh program creation part are arranged at an operation program creation device. In the case that the kind of the accumulator used in an accumulation device does not exhibit a memory effect when creating the operation program by using the operation program creation device, a refresh program for fully charging the accumulator by adding an electric charge to a remaining capacity is created. When the kind of the accumulator generates the memory effect, a refresh program which fully charges the accumulator after fully discharging the capacity remaining in the accumulator is created. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an operation plan creation device and creation method for a distributed power supply system, and more particularly to an operation plan creation device and creation method for a power storage device used in combination with a distributed power supply system.

  A distributed power supply system that introduces a plurality of distributed power supplies and constructs a system that can be operated independently from a commercial power system is known from Patent Document 1, Non-Patent Document 1, and the like. Equipment for constructing this distributed power supply system includes generators such as generators and boilers, accumulators such as storage batteries and heat storage tanks, converters such as refrigerators, and natural power sources such as sunlight and wind power. In order to perform an appropriate output for the energy demand using each of these facilities, a system operation plan creation device is provided.

For example, in Patent Document 1, the operation plan is created according to a flow as schematically shown in FIG. That is, based on the past operation plan and operation performance information recorded in the facility operation pattern management unit and the information such as the output amount / efficiency of each facility recorded in the facility specification information management unit, the operation plan creation unit To create an operation plan. As for the operation plan at that time, an operation plan for one day is created so as to satisfy the load amount predicted by the load amount prediction unit, and the operation plan of each facility considers the consistency with the currently operating facility. And create.
JP-A-2005-130550 Meiden Times, Vol.314, 2007-No.3.p6-10

Of each facility that constructs a distributed power supply system, a storage battery is used for load fluctuation absorption applications, load time shift applications, and both. The load fluctuation absorption application is to absorb a change in load amount in a short time that cannot be absorbed by other power generators (generators including power purchased from commercial power) constructed in the system. In addition, the load time shift application includes a time period in which a severe load fluctuation can be assumed in advance depending on the time, such as at the time of simultaneous machine start in the morning, for a long time or in a day. The storage battery is charged when the load amount is low, and the charged power is discharged when the load amount is high, thereby suppressing the amount of power generated by another power generator.
The operation plan of the equipment to be created is usually performed at intervals of several tens of minutes to about 1 hour. However, in the case of a storage battery, only the load time shift application is the target of the operation plan, but the one applied to the short time load change application is not the target of the operation plan.

  In creating a conventional operation plan, the storage battery is treated as a facility that can be charged and discharged in a timely manner within the capacity range except during periodic inspection of the facility. However, the storage battery is required to be refreshed periodically and fully charged for the following reasons.

Depending on the reason why the storage battery needs to be refreshed and the refresh method (1) Suppression of the memory effect Some batteries generate a memory effect by repeated charging and discharging. The memory effect here is a phenomenon in which the storage battery capacity appears to have decreased.If charging is repeated without fully using the capacity, the discharge voltage suddenly increases near the remaining capacity where charging is repeated during discharging. A decrease occurs, and the remaining battery capacity is reduced. FIG. 5 is an image of the memory effect.
In order to eliminate this memory effect, a refresh operation called complete discharge is required.
(2) Guarantee of remaining capacity specific point in control It is difficult to accurately grasp the remaining capacity of an existing storage battery. Therefore, a difference occurs between the remaining capacity for control and the actual remaining capacity while charging and discharging are repeated. In order to solve this problem, it is necessary to perform a refresh operation such as periodic full charge or full charge after complete discharge due to the reason described in (1) above, and correction of the remaining battery capacity is required.

Generally, in the operation plan creation of the distributed power supply system, the refresh operation plan necessary for the storage battery as described in the items (1) and (2) is not taken into consideration.
That is, the refresh operation plan is performed in a different dimension from the operation plan creation.For example, the storage battery that is the target of the refresh operation is excluded from the operation plan preparation target equipment as the same treatment as the periodic inspection, and the refresh operation target storage battery is The refresh operation is performed in parallel work in which the operation plan is created only by the operation plan target equipment. For this reason, the entire facility for constructing the distributed power supply system cannot be managed and operated in an integrated manner in the operation plan, and there is a problem that the facility operation plan is not efficiently created.

  Accordingly, an object of the present invention is to provide an operation plan creation device and a creation method that enable unified management of the entire facility of the distributed power supply system.

The present invention is an operation plan creation device for a distributed power supply system that has a plurality of distributed power sources and power storage devices and can be operated independently from a commercial power system, and the operation plan creation device manages information related to equipment specifications. The equipment specification management section and the operation plan creation section that creates an operation plan considering each information including the load information from the load management section and the constraint conditions of the equipment model, and the operation created by this operation plan creation device In the operation of each facility of the distributed power system through the operation control unit based on the plan,
The facility specification management unit of the operation plan creation device stores the management information including the type and rated capacity of the storage battery used in the power storage device, and the operation plan creation device performs a refresh operation on the storage battery used in the power storage device. A storage battery state management unit having a determination unit and a past refresh operation history information management unit, and a refresh operation plan of the storage battery is created based on a refresh operation execution determination signal by the storage battery state management unit and storage battery information in the facility specification management unit A storage battery refresh plan creation unit
The operation plan creation unit creates a storage battery operation plan based on actually measured load information and information from the storage battery refresh plan creation unit.

  The storage battery refresh plan in the storage battery refresh plan creation unit according to claim 1 is based on the storage battery refresh history acquired from the storage battery state management unit and the storage battery specification information acquired from the facility specification management. It is determined whether or not a predetermined period has been reached, and when the predetermined period is reached, a refresh signal is transmitted to the operation plan creation unit.

  According to the present invention, in the first or second aspect, when the storage battery used in the power storage device is of a type that does not generate a memory effect, the storage battery refresh plan creation unit adds to the capacity remaining in the storage battery to be fully charged. It is characterized by creating.

  Further, in the present invention, the storage battery refresh plan creation unit according to claim 1 or 2, when the storage battery used in the power storage device is of a type that generates a memory effect, performs a full discharge of the capacity remaining in the storage battery, Then, a refresh plan for full charge is created.

  The present invention, in claim 3 or 4, when the storage battery used in the power storage device is a mixture of a type that generates a memory effect and a type that does not generate a memory effect, records the presence / absence information on the occurrence of a memory effect in the facility specification management unit, The storage battery refresh plan creation unit creates a refresh plan based on information recorded in the facility specification management unit.

The present invention is an operation plan creation device for a distributed power supply system that has a plurality of distributed power sources and power storage devices and can be operated independently from a commercial power system, and the operation plan creation device manages information related to equipment specifications. It has an equipment specification management section and an operation plan creation section that creates an operation plan in consideration of each piece of information including load information from the load management section and constraint conditions of the equipment model. In what
The operation plan creation by the operation plan creation device is created in a unified manner with the operation plan of the equipment including the power supply device installed in the distributed power supply system, and the storage battery used for the power storage device does not generate the memory effect Sometimes, a refresh plan is created that is fully charged by adding to the capacity remaining in the storage battery, and when the storage battery is of a type that generates a memory effect, a refresh plan that is fully charged after performing full discharge of the capacity remaining in the storage battery. It is characterized by creating.

As described above, according to the present invention, in the operation plan creation of the distributed power supply system, the refresh operation of the storage battery, which has conventionally been created in a different dimension from the equipment such as the generator, the converter, and the natural power supply, Can be handled as a part of the system, and it is possible to realize unified management and operation of the operation plan creation. In addition, by performing an operation plan that takes a refresh plan into account using mathematical programming, it is possible to produce an efficient facility operation plan and the like.
In addition, when the storage battery is fully charged in the refresh operation, the entire capacity of the storage battery can be effectively used and a specific point in control can be guaranteed, so The deviation from the remaining battery capacity can be reset during the refresh operation.

  FIG. 1 shows a block diagram of an operation plan creation apparatus, which basically includes an operation plan means for equipment as shown in FIG. 4, but in FIG. 1, additional means particularly in the case of using a storage battery together. Is shown. Reference numeral 1 denotes an operation plan creation device that uses a storage battery together, and includes an equipment specification management unit 11, a storage battery refresh plan creation unit 12, a storage battery state management unit 13, and an operation plan creation unit 14. Reference numeral 2 denotes an operation control unit, and the control command is output to the power supply device 3, the power storage device 4, and the load management unit 6. The power supply device 3 in the distributed power supply system includes a commercial power system, an engine generator, a turbine generator, a fuel cell, solar power generation, wind power generation, and the like. Examples of the storage battery installed in the power storage device 4 include a lead storage battery, a nickel / cadmium storage battery (nickel storage battery), a nickel / hydrogen storage battery, a lithium ion battery, and a sodium / sulfur battery (NAS battery). 5 is a consumer.

  In the configuration as described above, the facility specification management unit 11 is information on various power facility specifications in the power supply device 3 including the storage battery specifications such as the storage battery type, the rated capacity, and the nominal voltage installed in the power storage device 4. Manage.

  The storage battery refresh plan creation unit 12 creates a refresh operation plan of the storage battery based on the refresh operation execution determination by the storage battery state management unit 13 and information from the facility specification management unit 11 and notifies the operation plan creation unit 14 of the plan. When the refresh operation is not completed in one day, the operation plan creation unit 14 is notified that the refresh target storage battery is continuing the refresh operation, and the storage battery state management unit 13 also performs the operation plan creation for the next day. Record that the battery needs to be refreshed. When a plan for completing the refresh operation can be created within a certain operation plan creation date, the date is notified to the storage battery state management unit 13 as the latest refresh operation date, and the storage battery state management unit 13 records it.

The storage battery state management unit 13 manages past refresh operation history information individually for all storage batteries installed in the power storage device 4. The refresh operation is performed at regular intervals, for example, once every 1 to 2 weeks, and the next refresh operation is determined based on the history information, and the storage battery refresh plan creation unit 12 is notified of it. Also,
The same notification is given to the storage battery refresh plan creation unit 12 for the storage battery that is continuing the refresh operation.
On the other hand, when a refresh operation completion notification arrives, the storage battery refresh plan creation unit 12 records the date as the latest refresh operation creation information of the corresponding storage battery.

The operation plan creation unit 14 creates an optimum facility operation plan based on the load information based on the actual measurement of the load management unit 6 and the information from the storage battery refresh plan creation unit 12.
The operation plan is created by assigning data managed by each unit to the constraint conditions of the equipment model such as generator, accumulator, converter, natural power source, etc., and the objective function parameters that are incorporated in the operation plan creation device in advance. Then, the objective function is expanded, and the optimal combination of the facility operation plan that satisfies the constraint condition and satisfies the objective function is calculated using a mathematical programming method. The constraints of the model include the power from the equipment that operates in each unit time, the total of the heat output is equal to the predicted power for that time, the amount of heat load, and so on.

  The load management unit 6 is connected to the operation plan creation device 1 that uses a storage battery together on the power supply / demand control network, or constitutes a part of the operation plan creation device 1, and the load of the target equipment for constructing the system Measure or predict the situation. Also, confirm the difference between the current addition status and the predicted load. When the deviation exceeds a predetermined value, the operation plan creation unit 14 is notified of the recreation of the operation plan.

  The operation control unit 2 is connected to the operation plan creation device 1 on the power supply and demand control network or constitutes a part of the operation plan creation device 1, and the storage battery according to the operation plan created by the operation plan creation unit 14. The equipment is operated and controlled, starting with the charge / discharge operation. Further, the power generation status and load status of the power supply device 3 including the power storage device 4 are periodically transmitted to the load management unit 6.

FIG. 2 shows a storage battery refresh plan creation flow created by the storage battery refresh plan creation unit 12. In step S1, a storage battery refresh history is acquired from the storage battery state management unit 13, and in S2, storage battery specification information is acquired from the facility specification management unit 11. Based on the acquired information, in S3, it is determined whether or not the predetermined period for executing the refresh operation has been reached. If the predetermined period has not been reached, the process ends. If the predetermined period has been reached, in S4. Create a refresh plan for each battery. The refresh plan for each storage battery is created as follows in consideration of the case where the storage battery used causes or does not cause the memory effect, or the case where both storage batteries are mixed.
Examples of the storage battery used for the power storage device 4 include a lead storage battery, a nickel / cadmium storage battery (nickel storage battery), a nickel / hydrogen storage battery, a lithium / ion battery, and a sodium / sulfur battery (NAS battery). Among these, the storage batteries that cause the memory effect are the nickel-cadmium storage battery and the nickel-hydrogen storage battery.
[When the power storage device is configured with a storage battery that does not cause a memory effect]
In the refresh operation of the storage battery that does not cause the memory effect, in addition to the remaining capacity of the current storage battery, a full charge is performed to enable additional charging. During the charging, a refresh operation plan is created so that the charging direction does not change even if the charging amount changes (so that it does not discharge during charging).
When a normal storage battery is repeatedly fully discharged and fully charged, the device is damaged and the service life is affected. Therefore, during operation, the storage battery capacity is operated with a likelihood at the upper and lower limits. As shown in FIG. 3, this likelihood is operated, for example, in an upper / lower limit of 10%, that is, within a range of 10% to 90% of the capacity.
However, in the refresh operation of the storage battery that does not cause the memory effect in the present invention,
When fully charged, charge exceeding the upper limit likelihood. The operation plan creation unit 14 cooperates with the storage battery refresh plan creation unit 11, and when the refresh target storage battery exists in the equipment for which the operation plan is created, the storage battery is excluded from the normal operation, and the above refresh operation is considered. Create an operational plan. It is possible to guarantee a specific point in control by charging the corresponding storage battery capacity to the full, and it is possible to reset the deviation of the remaining storage battery capacity in control.
[When the power storage device consists of a storage battery that produces a memory effect]
In the refresh operation of the storage battery that causes the memory effect, the battery is fully discharged and then fully charged. Even if the charge / discharge amount changes during charging / discharging, an operation plan is created so as not to change in the charging direction or discharging direction such as charging during discharging and discharging during charging.
In the case of a refresh operation of a storage battery that causes a memory effect, the upper and lower limits of the storage battery capacity do not have a likelihood as in normal charge / discharge control. In this case, charge / discharge control exceeding the upper limit likelihood is performed. The operation plan creation unit 14 cooperates with the storage battery refresh plan creation unit 11, and when the refresh target storage battery exists in the facility for which the operation plan is created, the storage battery is excluded from the normal operation, and the above refresh operation is considered. Create an operational plan. By fully discharging the remaining capacity of the corresponding storage battery and then charging it to the full capacity, it is possible to eliminate the memory effect and effectively use the entire capacity of the storage battery. Moreover, the deviation of the storage battery remaining capacity in control can be reset.
[When the power storage device is composed of a storage battery that causes the memory effect and a storage battery that does not cause the memory effect]
Whether or not a memory effect occurs according to the type of storage battery is added to the facility specification management unit 11 as management information. Thereby, even when the type of the storage battery is expanded in the future, it is possible to realize the refresh operation plan creation corresponding to the extended storage battery without changing the operation plan creation device 1.
When the operation plan creation unit 14 creates an operation plan in cooperation with the storage battery refresh plan creation unit 11, it determines whether there is a memory effect, creates an individual operation plan for the storage battery, outputs it to the operation control unit 2, and performs operation control. The unit 2 performs charge / discharge control separately for the storage battery in which the memory effect occurs and the storage battery in which the memory effect does not occur, as described above.

The block diagram of the driving | operation plan preparation apparatus which shows embodiment of this invention. The storage battery refresh plan creation flowchart of this invention. Explanatory drawing of the storage battery use range. The flowchart of the operation plan preparation of the conventional distributed power supply system. Explanatory drawing of a memory effect.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Operation plan preparation apparatus 2 ... Operation control part 3 ... Power supply apparatus 4 ... Power storage apparatus 5 ... Consumer 6 ... Load management part 11 ... Equipment specification management part 12 ... Storage battery refresh plan preparation part 13 ... Storage battery state management part 14 ... Operation Planning department

Claims (6)

An operation plan creation device for a distributed power supply system that has a plurality of distributed power sources and power storage devices and can be operated independently from a commercial power system, and the operation plan creation device manages information related to equipment specifications. And an operation plan creation unit that creates an operation plan in consideration of each piece of information including the load information from the load management unit and the constraints of the equipment model, and operates based on the operation plan created by this operation plan creation device In the operation of each facility of the distributed power system through the control unit,
The facility specification management unit of the operation plan creation device stores the management information including the type and rated capacity of the storage battery used in the power storage device, and the operation plan creation device performs a refresh operation on the storage battery used in the power storage device. A storage battery state management unit having a determination unit and a past refresh operation history information management unit, and a refresh operation plan of the storage battery is created based on a refresh operation execution determination signal by the storage battery state management unit and storage battery information in the equipment specification management unit A storage battery refresh plan creation unit
The operation plan creation unit creates a storage battery operation plan based on the actually measured load information and information from the storage battery refresh plan creation unit. Whether the storage battery refresh plan in the storage battery refresh plan creation unit has reached the predetermined cycle of the storage battery based on the storage battery refresh history acquired from the storage battery state management unit and the storage battery specification information acquired from the facility specification management 2. The operation plan creation device for a distributed power supply system according to claim 1, wherein a refresh signal is transmitted to the operation plan creation unit when a predetermined period is reached. The storage battery refresh plan creation unit creates a refresh plan for full charge in addition to the capacity remaining in the storage battery when the storage battery used for the power storage device is of a type that does not generate a memory effect. An operation plan creation device for a distributed power supply system according to 1 or 2. When the storage battery used in the power storage device is of a type that generates a memory effect, the storage battery refresh plan creation unit creates a refresh plan that performs full discharge of the capacity remaining in the storage battery and then fully charges the storage battery. The operation plan creation device for a distributed power supply system according to claim 1 or 2, characterized by the above-mentioned. When the storage battery used in the power storage device is a mixture of a type that generates a memory effect and a type that does not generate a memory effect, it records information on whether or not a memory effect has occurred in the facility specification management unit, and the storage battery refresh plan creation unit stores the facility specification 5. The distributed power system operation plan creation device according to claim 3, wherein the refresh plan is created based on information recorded in the management unit. An operation plan creation device for a distributed power supply system that has a plurality of distributed power sources and power storage devices and can be operated independently from a commercial power system, and the operation plan creation device manages information related to equipment specifications. And having an operation plan creation unit that creates an operation plan in consideration of each information including load information from the load management unit and the constraint conditions of the equipment model, and creating an operation plan with this operation plan creation device,
The operation plan creation by the operation plan creation device is created in a unified manner with the operation plan of the equipment including the power supply device installed in the distributed power supply system, and the storage battery used for the power storage device does not generate the memory effect Sometimes, a refresh plan is created that is fully charged by adding to the capacity remaining in the storage battery, and when the storage battery is of a type that generates a memory effect, a refresh plan that is fully charged after performing full discharge of the capacity remaining in the storage battery. A method for creating an operation plan for a distributed power supply system, characterized in that

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