JP2019161843A - Power storage control device - Google Patents

Abstract

To provide a power storage control device that can easily reduce the power supply cost in a time zone when the procurement price of commercial power is the same.SOLUTION: There is provided a power storage control device that can store power supplied from a commercial power source and power generation equipment, and controls power storage and discharge in the power storage equipment that can discharge the stored power and supply it to the load equipment, comprising: a calculation unit 32 that calculates the unit price of discharge power of the power storage facility in a predetermined time unit based on the ratio of the amount of power which is derived from the power generation facility and stored in the power storage facility and the amount of power derived from the commercial power source; a plan creation unit 33 that creates a charge/discharge plan for the power storage facility based on the calculated discharge power unit price; and an output unit 34 that outputs a signal for controlling storage and discharge of the storage facility based on the created charge/discharge plan.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power storage control device.

  So-called peak shaving that uses a secondary battery such as a lithium-ion battery to reduce peak power, which is the peak power demand consumed by a load device, and shifts peak power demand to a less expensive time zone for commercial power Is generally used (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2006-063629

  As described above, the procurement price information of commercial power is considered in the prior art, but there is a problem that the optimal charge / discharge timing in the time zone where the procurement price of commercial power is the same is not considered. . In other words, if the commercial power price is the same period, it can be said that it does not change at any timing (time value is not considered).

  The present invention has been made to solve the above-described problem, and provides a power storage control device capable of easily reducing the power supply cost in a time zone where the procurement price of commercial power is the same. With the goal.

In order to achieve the above object, the present invention provides the following means.
The power storage control device of the present invention is a power storage control device that can store power supplied from a commercial power source and power generation equipment, and controls power storage in a power storage equipment that can discharge the stored power and supply it to a load equipment. A calculation unit that calculates a unit price of discharge power of the power storage facility in a predetermined time unit based on a ratio of the amount of power derived from the power generation facility stored in the power storage facility and the amount of power derived from the commercial power source. And a plan creation unit for creating a charge / discharge plan for the power storage facility based on the calculated unit price of the discharge power, and a signal for controlling storage and discharge of the power storage facility based on the created charge / discharge plan. And an output unit that performs the operation.

  According to the power storage control device of the present invention, the discharge power unit price is calculated based on the amount of power derived from the power generation facility and the amount of power derived from the commercial power source, and the charge / discharge plan created based on the discharge power unit price Is used to control the storage and discharge of the storage facility. Since power storage and discharge are performed according to the charge / discharge plan based on the unit price of discharge power, it is easy to reduce the power supply cost in the time zone when the procurement price of commercial power is the same.

  In the above invention, the power storage facility is a secondary battery, and the calculation unit calculates the discharge power unit price based on efficiency characteristics in a power conversion device that controls storage and discharge of power to the secondary battery. Is preferred.

Thus, by calculating the discharge power unit price based on the efficiency characteristic in the power conversion device, it becomes easier to increase the accuracy of the calculated discharge power unit price than in the case where it is not based on the efficiency characteristic. Here, the efficiency characteristic in the power converter varies due to the operating load factor.

  In the said invention, when there exists a demand response demand, it is preferable that the said plan preparation part produces the said charging / discharging plan further based on the incentive at the time of responding to the said demand response.

  As described above, when the charge / discharge plan is created, the power supply cost can be easily reduced compared to the case where the charge / discharge plan is not based on the incentive based on the demand response.

  In the said invention, the said plan preparation part repeats the operation | work which produces another charge / discharge plan more than once based on the created said charge / discharge plan, and from a plurality of obtained charge / discharge plans, a predetermined charge / discharge plan is obtained. It is preferable to extract.

  In this way, by creating a plurality of charge / discharge plans and extracting a predetermined charge / discharge plan from a plurality of charge / discharge plans, compared to the case of creating only one charge / discharge plan, It becomes easy to reduce.

  In the above invention, it is preferable that the unit price of generated power, which is a unit price of power generated by the power generation facility, is lower than a unit price of commercial power, which is a unit price of power supplied from the commercial power source.

In the above invention, the power generation facility is preferably a renewable energy power generation facility that generates power using renewable energy.
Thus, by using the renewable energy power generation facility that generates power using renewable energy as the power generation facility, it becomes easier to reduce the power supply cost compared to the case of using other power generation facilities.

  According to the power storage control device of the present invention, since power storage and discharge are performed according to a charge / discharge plan based on the unit price of discharge power, the effect of facilitating reduction of power supply cost in a time zone where the procurement price of commercial power is the same is obtained. Play.

It is a schematic diagram explaining the structure of the power management system containing the low-order power management part of this invention. It is a block diagram explaining the structure in the low-order power management part of FIG. It is a flowchart explaining the control content in a low-order power management part. 4A is a table of power supply unit prices calculated by the lower power management unit, FIG. 4B is a table of supplyable quantities, and FIG. 4C is a table of supply plans.

  A power management system 10 including a lower power management unit 31 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. The power management system 10 according to the present embodiment manages power supply from one of the commercial power source 40, the power generation facility 51, and the power storage facility 61 to the demand facility 71.

As shown in FIG. 1, the power management system 10 includes a higher power management device 21, a lower power management unit (power storage control device) 31, a power conversion device 41, a power generation facility 51, a power storage facility 61,
Demand equipment (load equipment) 71 is mainly provided.

  The upper power management apparatus 21 outputs instruction information that is information related to the content of power control, such as demand response (hereinafter also referred to as “DR”), to the lower power management unit 31 disposed under the upper power management apparatus 21. . In the present embodiment, an example is shown in which the upper power management device 21 and the lower power management unit 31 are provided on a one-to-one basis, but a plurality of lower power management units 31 are provided for one upper power management device 21. May be provided. The upper power management apparatus 21 is an information processing apparatus such as a server having a CPU (Central Processing Unit), ROM, RAM, input / output interface, and the like.

  An example of the upper power management apparatus 21 is a CEMS (Community Energy Management System) that manages power demand and supply in a predetermined area. Examples of the lower power management unit 31 include a building such as a predetermined building and a BEMS (Building Energy Management System) or a HEMS (Home Energy Management System) that manages the supply and demand of power in a home. it can.

  The lower power management unit 31 controls at least power storage and discharge in the power storage facility 61. The lower power management unit 31 is an information processing apparatus such as a server having a CPU (Central Processing Unit), ROM, RAM, input / output interface, and the like. As shown in FIG. 2, the program stored in the storage device such as the above-described ROM cooperates with the CPU, ROM, RAM, and input / output interface, and at least the calculation unit 32, the plan creation unit 33, and the input unit. It functions as an output unit (output unit) 34 and a storage unit 35.

  Based on the amount of power generated by the power generation facility 51 stored in the power storage facility 61 and the ratio of the amount of power stored from the commercial power source 40, the calculation unit 32 calculates the discharge power unit price of the power storage facility 61 in predetermined time units. Is calculated. A specific calculation method will be described later.

  The plan creation unit 33 creates a charge / discharge plan for the power storage facility 61 based on the calculated discharge power unit price. Further, when there is a DR request from the higher-level power management apparatus 21, a charge / discharge plan is also created based on an incentive in response to the DR.

  The input / output unit 34 outputs a signal for controlling power storage and discharge of the power storage facility 61 to the power conversion device 41 based on the created charge / discharge plan. In addition, a DR request output from the upper power management apparatus 21 is also input.

  The storage unit 35 stores the unit price (yen / kWh) of the commercial power used for calculating the unit price of discharge power, the value of the suppliable power amount (kWh), and the unit price of the incentive according to the DR (yen / kWh). ) Etc. are stored.

  As shown in FIG. 1, the power conversion device 41 is disposed between the commercial power supply 40 and the demand facility 71. Further, the commercial power received from the commercial power source 40 or the power generated by the power generation facility 51 is supplied to the demand facility 71 and the power storage facility 61 as usable power. As the power conversion device 41, a known device can be used and is not particularly limited.

The power generation facility 51 is a facility that generates at least one of the power supplied to the demand facility 71 and the power charged in the power storage facility 61. In the present embodiment, description will be made by applying to an example in which the power generation facility 51 is a renewable energy power generation facility that generates power using renewable energy. Note that the power generation facility 51 may be any unit that can generate renewable energy as long as the unit price of generated power, which is the unit price of generated power, is lower than the unit price of commercial power, which is the unit price of power supplied from the commercial power source. Something other than power generation equipment may be used.

  Specifically, a photovoltaic power generation facility (also denoted as “PV”), a wind power generation facility (also denoted as “WT”), a fuel cell facility (also denoted as “FC”), a gas engine The power generation facility by can be exemplified. For example, in the present embodiment, description will be made by applying to an example in which the power generation facility 51 is PV. In addition, about the system and format of PV, a well-known system and format can be used and it does not specifically limit.

  The power storage facility 61 stores the commercial power received from the commercial power supply 40 or the power generated by the power generation facility 51, and discharges the stored power and supplies it to the demand facility 71. Examples of the power storage facility 61 include a secondary battery, an electric vehicle (also referred to as “EV”), a capacitor (capacitor), a power storage unit using a flywheel, and the like. In the present embodiment, description will be made by applying to an example in which the power storage facility 61 is a secondary battery. In addition, the kind and form of a secondary battery can use a well-known kind and form, and it does not specifically limit it.

  The demand facility 71 is a facility that consumes electric power such as an air conditioner or a lighting device. In FIG. 1, a demand facility (load facility) 71 </ b> A that receives power supply via the power conversion device 41 and a demand facility (load facility) 71 </ b> B that receives power supply from the commercial power supply 40 without passing through the power conversion device 41 are shown. An example in which is provided is shown.

  Between the commercial power source 40 and the power converter 41, a power receiving point 45 and an adjustment point 46 are provided in order from the commercial power source 40 side. A branch point to the demand facility 71 </ b> B is provided between the power receiving point 45 and the adjustment point 46. In the present embodiment, the power receiving point 45 and the adjustment point 46 are described as being applied to different examples. However, they may be the same and are not particularly limited.

  Next, control in the lower power management unit 31 of the power management system 10 having the above configuration will be described with reference to FIGS. 3 and 4. The lower power management unit 31 performs the following processing at a predetermined timing, for example, once a day.

  When the process is started, the calculation unit 32 of the lower power management unit 31 performs a calculation process for predicting power generation by the power generation facility 51 (S101). That is, the calculation unit 32 performs a calculation process for predicting the generated power curve for the entire day (for example, from 0:00 to 24:00) of the power generation facility 51 on the control target date by the day before the control target date. The predicted generated power curve is used to estimate the expected power generation amount by time zone on the control day.

  When power generation is predicted, the calculation unit 32 performs a calculation process for predicting the demand of the whole (demand equipment 71A and demand equipment 71B) (S103). That is, a calculation process for predicting a demand power curve at the power receiving point 45 on the control target date is performed by the day before the control target date. The demand power curve predicted in S103 is used to estimate the peak power value in the building where the demand equipment 71A and the demand equipment 71B are provided. When the power receiving point 45 and the adjustment point 46 described later are the same, the calculation process of S103 is not performed.

  When the overall demand is predicted, the calculation unit 32 performs a calculation process for predicting the demand at the adjustment point 46 (S105). That is, the calculation process for predicting the demand power curve at the adjustment point 46 on the control target date is performed by the day before the control target date. The demand power curve predicted in S105 is used to estimate a power curve that serves as a reference for formulating a charge / discharge schedule to be set in the power converter 41.

  When the demand at the adjustment point 46 is predicted, the plan creation unit 33 of the lower power management unit 31 calculates a charge / discharge plan (hereinafter also referred to as “scenario 1”) when there is no DR request. (S107). In other words, a calculation process is performed to formulate an optimized charge / discharge plan when DR is not received from the upper power management apparatus 21.

  First, the plan creation unit 33 supplies power based on the calculated generated power curve, the predicted demand power curve, the amount of power charged in the power storage facility 61, and the efficiency characteristics of conversion in the power conversion device 41. Calculation processing for calculating unit price information (see FIG. 4A) and supplyable quantity information (see FIG. 4B) is performed. The efficiency characteristics of the power conversion device 41 are such that the conversion efficiency increases (loss decreases) as the amount of power to be converted approaches the rating, and the conversion efficiency decreases as the distance from the rating decreases.

  Here, the unit price of power supply indicates the unit price (yen / kWh) when purchasing (procuring) power from the commercial power source 40. In the present embodiment, description will be made by applying to the case where the unit price for each predetermined time zone is known.

  The supplyable quantity indicates the amount of power that can be supplied from the power storage facility 61, the amount of power that can be supplied from the power generation facility 51, and the amount of power that can be supplied from the commercial power supply 40. In the present embodiment, description will be made by applying to the case where the amount of power (kWh) that can be supplied for each predetermined time period is known.

  When the information on the power supply unit price and the information on the suppliable quantity are acquired, the plan creation unit 33 performs a calculation process for creating a power supply plan (see FIG. 4C) for the demand facility 71. In creating the supply plan, the above-described demand power curve and the like are also referred to.

  The plan creation unit 33 performs arithmetic processing for creating a charge / discharge plan (scenario 1) for the power storage facility 61 based on the supply plan created in this way. In the charge / discharge plan, the amount of power supplied from the commercial power source 40 when charging the power storage facility 61, the ratio of the amount of power supplied from the power generation facility 51, the time zone for charging, and the like are set. . Moreover, the electric energy to discharge in the case of discharging in the electrical storage equipment 61, the time slot | zone to discharge, etc. are set. As a specific calculation process for creating scenario 1, a known calculation process can be used.

  When scenario 1 is formulated, the lower power management unit 31 performs arithmetic processing to determine whether there is a DR request (S109). In other words, a calculation process for confirming the presence / absence of a DR request from the upper power management apparatus 21 is performed.

  When it is determined that there is a request for DR (in the case of YES), the plan creation unit 33 of the lower power management unit 31 is also referred to as a charge / discharge plan (hereinafter “scenario 2”) when there is a request for DR. ) Is optimized (S111). In other words, a calculation process for formulating an optimized charge / discharge plan when a DR response is made is performed.

  Specifically, the plan creation unit 33 performs processing for acquiring information on incentives (reward amounts) in response to DR from the upper power management apparatus 21. The incentive information indicates a remuneration amount per unit power amount paid when the power purchased from the commercial power source 40 is reduced, or a remuneration amount for each predetermined time zone.

When the incentive information is acquired, the plan creation unit 33 creates a power supply plan for the demand facility 71 based on the incentive information, the already acquired power supply unit price information, and the supplyable quantity information. Process. The plan creation unit 33 performs arithmetic processing for creating a charge / discharge plan (scenario 2) for the power storage facility 61 based on the supply plan created in this way. As a specific calculation process for creating the scenario 2, a known calculation process can be used.

  When scenario 2 is formulated, the plan creation unit 33 performs arithmetic processing to determine whether the power supply cost when executing scenario 2 is lower than the power supply cost when executing scenario 1 (S113).

  First, the plan creation unit 33 performs a calculation process for calculating the power supply cost when the scenario 1 is executed and the power supply cost when the scenario 2 is executed. Thereafter, a calculation process is performed to compare the power supply cost for executing scenario 1 and the power supply cost for executing scenario 2.

  In the calculation of the power supply cost, the unit price of the power discharged from the power storage facility 61 (discharge power unit price) is also calculated. The discharge power unit price is a virtual unit price based on the commercial power unit price, and the amount of power derived from the power generation facility 51 and the amount of power derived from the commercial power source 40 among the power charged in the power storage facility 61. It is calculated based on the ratio.

When it is determined that the power supply cost of scenario 2 is low (in the case of YES), the plan creation unit 33 performs a process of adopting scenario 2 (S115).
On the other hand, if it is determined in S109 that there is no DR request (in the case of NO), or if it is determined in S113 that the power supply cost of scenario 1 is low (in the case of NO), the plan The creation unit 33 performs a process of adopting scenario 1 (S117).

  When the process of adopting scenario 2 or the process of adopting scenario 1 is performed, the lower power management unit 31 performs a process of setting charge / discharge (S119). That is, the lower power management unit 31 performs a process of outputting the information on the charge / discharge plan according to the adopted scenario to the power conversion device 41. The power converter 41 performs control based on the input charge / discharge plan.

  Thereafter, the lower power management unit 31 performs a process of notifying the response result of the DR (S121). That is, a process of notifying the upper power management apparatus 21 of a result of responding to DR or not responding to DR is performed. Thereafter, the lower power management unit 31 returns to S101 and repeats the above processing.

  According to the lower power management unit 31 having the above configuration, the discharge power unit price is calculated based on the ratio of the power amount derived from the power generation facility 51 and the power amount derived from the commercial power supply 40, and is created based on the discharge power unit price. The storage / discharge of the power storage facility 61 is controlled using the charged / discharge plan. Since power storage and discharge are performed according to the charge / discharge plan based on the unit price of discharge power, it is easy to reduce the power supply cost in the time zone when the procurement price of commercial power is the same.

  By calculating the discharge power unit price based on the efficiency characteristic in the power conversion device 41, it becomes easier to increase the accuracy of the calculated discharge power unit price than when not based on the efficiency characteristic.

  When creating a charge / discharge plan, the power supply cost can be reduced more easily by creating the charge / discharge plan based on the incentive in the case of the DR as compared with the case of not using the incentive.

  Compared to creating only one charge / discharge plan by creating multiple charge / discharge plans (scenario 1 and scenario 2) and extracting an inexpensive charge / discharge plan from the multiple charge / discharge plans. This makes it easier to reduce costs.

  By using a renewable energy power generation facility that generates power using renewable energy as the power generation facility 51, it becomes easier to reduce the power supply cost compared to the case where other power generation facilities are used.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the present embodiment, the lower power management unit 31 has been described as being applied to the example in which the process illustrated in the flowchart of FIG. 3 is performed. However, the power conversion apparatus 41 may perform the process, and the place where the process is performed. It is not intended to limit.

  DESCRIPTION OF SYMBOLS 31 ... Lower power management part (electric storage control apparatus), 32 ... Calculation part, 33 ... Plan preparation part, 34 ... Input / output part (output part), 51 ... Power generation equipment, 61 ... Electric power storage equipment, 71 ... Demand equipment (load equipment) ), 71A ... Demand equipment (load equipment), 71B ... Demand equipment (load equipment)

Claims (6)

A power storage control device that can store power supplied from a commercial power source and power generation equipment, and stores power in the power storage equipment that can discharge the stored power and supply the load power to the load equipment,
Based on the amount of power derived from the power generation facility stored in the power storage facility, and the ratio of the amount of power derived from the commercial power source, a calculation unit that calculates the unit price of discharge power of the power storage facility in a predetermined time unit;
Based on the calculated discharge power unit price, a plan creation unit that creates a charge / discharge plan for the power storage facility,
An electrical storage control device, comprising: an output unit that outputs a signal for controlling electrical storage and discharge of the electrical storage facility based on the created charge / discharge plan. The power storage facility is a secondary battery,
2. The power storage control device according to claim 1, wherein the calculation unit calculates the discharge power unit price based on efficiency characteristics in a power conversion device that controls storage and discharge of power to and from the secondary battery.   3. The power storage according to claim 1, wherein when there is a demand response request, the plan creation unit further creates the charge / discharge plan based on an incentive in response to the demand response. Control device.   The plan creation unit repeats the work of creating another charge / discharge plan a plurality of times based on the created charge / discharge plan, and extracts a predetermined charge / discharge plan from the obtained charge / discharge plans. The power storage control device according to any one of claims 1 to 3, wherein:   5. The generated power unit price, which is a unit price of power generated by the power generation facility, is lower than a unit price of commercial power amount, which is a unit price of power supplied from the commercial power source. The power storage control device according to any one of the above.   5. The power storage control device according to claim 1, wherein the power generation facility is a renewable energy power generation facility that generates power using renewable energy. 6.