JP2013236519A - Storage battery charge/discharge control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine whether the charge control of a storage battery is appropriate on the basis of electricity rate information.SOLUTION: A HEMS 30 acquires a rate plan stipulating different electricity rates depending on time zone from an information center 80, sets the acquired rate plan, and sets a scheduled charge time at which a set storage battery 90 is charged. Furthermore, the HEMS 30 checks the scheduled charge time thus set to see if it overlaps a time zone whose electricity rate in the rate plan is high. If the scheduled charge time overlaps a time zone whose electricity rate in the rate plan is high, the HEMS 30 determines that the scheduled charge time is erroneously set.

Description

  The present invention relates to a storage battery charge / discharge control device that controls charge / discharge of a storage battery based on an electricity bill.

  In the past, there have been devices that charge storage batteries in consideration of electricity charges and charging time zones.

  For example, Patent Document 1 proposes an invention of a storage battery charge / discharge device that creates a charge / discharge schedule based on electricity rate information and storage battery information, and charges / discharges the storage battery based on the created schedule. Yes.

JP 2010-268602 A

  However, the technique described in Patent Literature 1 has a problem that it does not consider verification of the suitability of the created charge / discharge schedule.

  The present invention has been made in consideration of the above-described facts, and an object of the present invention is to provide a storage battery charge / discharge control device that determines suitability of charge control of a storage battery based on information on an electricity bill.

  The invention of claim 1 for solving the above-mentioned problem is to obtain rate plans with different electricity charges in time zones from time setting means for setting a scheduled charging time for charging a storage battery and an information center for managing information on electricity charges. A charge plan setting means for setting the acquired charge plan, and a scheduled charging time set by the time setting means in a time zone in which the electricity charge in the charge plan set by the charge plan setter is high. Whether the setting of the scheduled charging time is appropriate or not, and if the scheduled charging time overlaps the expensive time zone, the estimated charging time is erroneously set. Control means for determining.

  According to the first aspect of the present invention, if the set scheduled charging time is overlapped with a time period when the electricity bill is expensive in the rate plan, it is determined that the scheduled charging time is set incorrectly. Therefore, it is possible to determine whether or not the charging control of the storage battery is appropriate based on the information on the electricity rate.

  The invention according to claim 2 is the invention according to claim 1, further comprising power consumption measuring means for measuring the power consumption of the building, wherein the acquisition means is set by the rate plan setting means from the information center The information on the unit price of the electricity charge in each time zone of the rate plan is further acquired, and the control means is the information on the power consumption of the building measured by the power consumption measurement means and the information on the unit price of the electricity charge obtained by the acquisition means. And calculating the electricity charge based on the power consumption amount of the building, and comparing the electricity charge before and after the estimated charge time is set among the calculated electricity charges. It is determined whether or not the setting is appropriate, and if the electricity bill has increased after the scheduled charging time is set, it is determined that the scheduled charging time is set incorrectly.

  According to the invention described in claim 2, the electricity charges of the building before and after the setting of the scheduled charging time is compared, and if the electricity charge has increased after the setting, it is determined that the scheduled charging time is set incorrectly. Therefore, it is possible to determine the suitability of the storage battery charging control based on the information on the electricity rate.

  According to a third aspect of the present invention, in the invention according to the second aspect, the control means is configured such that the power rate calculated in a predetermined number of days before the scheduled charging time is set and the scheduled charging time are set. Whether the setting of the scheduled charging time is appropriate or not is determined by comparing with the electricity rate calculated in the predetermined number of days.

  According to the third aspect of the present invention, whether or not the setting of the scheduled charging time is determined based on the change in the electricity charge during a certain period, it is possible to make a determination in accordance with the actual power consumption of the building. .

  According to a fourth aspect of the present invention, in the invention according to the second or third aspect, the control means performs the nighttime when the electric rate in the nighttime period is equal to or less than a predetermined threshold among the calculated electric rates. The time setting means is controlled so as to set the time zone for the scheduled charging time.

  According to the fourth aspect of the present invention, when the measured nighttime electricity charge of the building is low, the night time zone can be set as the scheduled charging time zone.

  According to a fifth aspect of the present invention, in the invention according to the second or third aspect, the control means is configured to generate solar light when the electric charge in the night time zone of the calculated electric charge exceeds a predetermined threshold. The time setting means is controlled so as to set a time zone in which power generation by the power generation device is possible as a scheduled charging time.

  According to the fifth aspect of the present invention, when the measured nighttime electricity bill of the building is expensive, the time zone in which solar power generation is possible can be set as the scheduled charging time.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, further comprising display means for displaying information, wherein the control means displays a determination result of suitability for setting the scheduled charging time. Display on the display means.

  According to the sixth aspect of the present invention, the result of determination of the estimated charging time can be notified to the user.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, further comprising a transmission unit capable of transmitting the determination result to the portable terminal, wherein the control unit is configured via the transmission unit, A determination result of whether the setting of the scheduled charging time is appropriate is transmitted, and the determination result is displayed on the portable terminal.

  According to the seventh aspect of the present invention, it is possible to notify the user of a remote location of the result of the determination of the scheduled charging time.

  As described above, the invention according to claim 1 determines that the setting is not appropriate when the scheduled charging time overlaps with a time zone where the electricity rate is high. Thus, it is possible to determine whether or not the charge control of the storage battery is appropriate.

  According to the second aspect of the invention, the electricity charge before and after setting the estimated charging time is compared, and if the electricity charge is increased after the setting, it is determined that the setting is not appropriate. Based on this, it is possible to determine whether or not the charge control of the storage battery is appropriate.

  According to the third aspect of the present invention, since it is determined whether or not the scheduled charging time is set based on the electricity charge in a predetermined period, it is possible to determine whether or not the charging control of the storage battery matches the actual usage of the power. It has the effect of being able to.

  According to the fourth aspect of the present invention, there is an effect that the cost required for charging the storage battery can be suppressed by setting the night time zone where the electricity bill is low as the scheduled charging time.

  According to the invention described in claim 5, when the electricity bill at night is high, the time required for solar power generation is set as the scheduled charging time, thereby suppressing the cost required for charging the storage battery. Has the effect of being able to.

  According to the sixth aspect of the present invention, it is possible to prompt the user to prompt the user to set again when the setting is not appropriate by notifying the user of the appropriateness of the setting of the scheduled charging time.

  According to the seventh aspect of the invention, there is an effect that it is possible to notify a remote user of whether or not the setting of the scheduled charging time is appropriate.

It is the schematic which shows the whole image of the system containing the storage battery charging / discharging control apparatus which concerns on embodiment of this invention. It is a figure which shows the outline of an example of the charge plan of an electricity bill. It is a block diagram which shows schematic structure of HEMS30 which is the storage battery charging / discharging control apparatus which concerns on embodiment of this invention. It is a flowchart which shows control of the storage battery by HEMS which is the storage battery charging / discharging control apparatus which concerns on embodiment of this invention. It is a figure which shows an example in case charging scheduled time overlaps with the highest charge time zone. It is a flowchart of the setting process of the scheduled charging time in the embodiment of the present invention.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing an overall image of a system including a storage battery charge / discharge control device according to an embodiment of the present invention.

  The building 10 is provided with a distribution board 14 to which the system power 12 supplied from the power company is connected, so that the power from the system power 12 is supplied into the building 10 through the distribution board 14. It has become.

  The building 10 is provided with a solar power generation device 16, and the electric power generated by the solar power generation device 16 is supplied to the distribution board 14.

  Between the photovoltaic power generation device 16 and the distribution board 14, a photovoltaic power generation current voltage sensor 54 capable of measuring the current value and voltage value of the electric power supplied from the photovoltaic power generation device 16 to the distribution board 14 is provided. It has been. The current value and voltage value measured by the photovoltaic power generation current / voltage sensor 54 can be transmitted to a HEMS (Home Energy Management System) 30 described later via the distribution board 14.

  The distribution board 14 is connected to home appliances 20 and housing equipment 22 provided in the building 10 as a plurality of power supply destinations, and is supplied with power from the grid power 12.

  In addition, the distribution panel 14 manages and controls the storage battery 90 capable of charging the power supplied from the grid power 12 and the photovoltaic power generation device 16 and the energy in the building, and controls charging and discharging of the storage battery 90. HEMS30 which is a storage battery charging / discharging control apparatus is connected.

  The storage battery 90 is a secondary battery that can be charged and discharged, such as a lead storage battery, a nickel metal hydride battery, or a lithium ion battery. Since one cell of these secondary batteries has an electromotive force of approximately 1 to 2 V, in this embodiment, a plurality of cells are connected in series so that a desired voltage can be obtained. Further, a desired current can be obtained by bundling a plurality of aggregates composed of a plurality of cells connected in series so as to obtain a desired voltage.

  Further, the packaged storage battery 90 converts alternating current (for example, 100 V, 50 Hz) supplied through the distribution board 14 into direct current having a voltage suitable for charging the storage battery, and the storage battery 90 is discharged. Conversion means (not shown) such as a bidirectional inverter capable of converting direct current into alternating current supplied from the distribution board 14 to the home appliance 20 and the housing equipment 22 is provided.

  Furthermore, the storage battery 90 includes a charge / discharge control circuit (not shown) that controls charging / discharging of the storage battery 90, and is controlled by the HEMS 30 via the storage battery control interface 56 together with the above-described inverter.

  The storage battery control interface 56 has a function as a control interface, and also has a sensor function capable of measuring the current and power flowing between the distribution board 14 and the storage battery 90.

  In addition, a current sensor 52 is provided in a circuit that supplies power from the distribution board 14 to the home appliance 20 and the residential equipment 22. The current value and voltage value measured by the current sensor 52 can be transmitted to the HEMS 30 via the distribution board 14.

  The HEMS 30 supplies the power of the grid power 12, the photovoltaic power generation device 16, and the storage battery 90 to the building 10 by controlling the distribution board 14 and the storage battery 90 via the storage battery control interface 56, or the storage battery 90. The power for charging is controlled.

  Further, the HEMS 30 calculates the power consumption in the building 10 based on the current value measured by the current sensor 52 and the current value and voltage value measured by the storage battery control interface 56.

  Specifically, the amount of power consumed by the home appliance 20 and the residential equipment 22 is calculated by multiplying the current value measured by the current sensor 52 by a predetermined voltage value, for example, 100V.

  In addition, the amount of power used by charging the storage battery 90 is calculated from the current value and voltage value of the power supplied from the distribution board 14 to the storage battery 90 in order to charge the storage battery 90 measured by the storage battery control interface 56.

  Next, the power consumption amount of the building 10 is calculated by summing the power consumption amount based on the measurement of the current sensor 52 and the power consumption amount based on the measurement of the storage battery control interface 56.

  The HEMS 30 is connected to the information center 80 via the network 60, and acquires from the information center 80 information on rate plans with different electricity charges for each time zone of the system power 12 and information on the unit price of the electricity charges of the system power 12.

  FIG. 2 is a diagram showing an outline of an example of an electricity bill plan. Fig. 2 shows that the electricity charge is low during the night time, the electricity charge is high during the daytime, and the transmission charge is equivalent to the middle of the night and daytime during the morning and evening hours. "Lights by time zone".

  As an example, the unit price of the electricity charge in each time zone is 10 yen / kWh at night, 32 yen / kWh at daytime, and 22 yen / kWh at morning and evening.

  In the present embodiment, it is assumed that the HEMS 30 can calculate the electricity charge based on the power consumption of the building 10 based on the power consumption of the building 10 and the unit price of the electricity charge.

  FIG. 3 is a block diagram showing a schematic configuration of the HEMS 30 which is the storage battery charge / discharge control device according to the present embodiment.

  As shown in FIG. 3, the HEMS 30 includes a CPU 36, a ROM 38, a RAM 40, and an input / output port 42. These include a bus 44 such as an address bus, a data bus, and a control bus. Are connected to each other.

  A display unit 46, an operation unit 48, and a memory 50 are connected to the input / output port 42 as various input / output devices. The display unit 46 and the operation unit 48 are integrally configured, and a touch panel provided on the display unit 46 can be applied to the operation unit 48.

  In the present embodiment, the scheduled charging time for charging the storage battery 90 by the operation of the operation unit 48 can be set in advance, and the HEMS 30 charges the storage battery 90 when the time set according to the time measuring function provided in the computer is reached. To do.

  The memory 50 stores a program for controlling power supplied to the building 10, a program for controlling charge / discharge of the storage battery 90, and the like.

  Further, the memory 50 stores various information for executing these programs.

  The HEMS 30 performs various types of control such as control of power supplied to the building 10 by developing a program stored in the memory 50 in the RAM 40 and executing it by the CPU 36.

  Further, the input / output port 42 is connected to the distribution board 14, the storage battery control interface 56, and the network interface 34 that can transmit and receive information to and from the information center 80. In the present embodiment, it is assumed that the HEMS 30 can acquire the measurement results of the current sensor 52 and the photovoltaic power generation current / voltage sensor 54 via the distribution board 14.

  Next, control of the storage battery 90 by HEMS30 is demonstrated using FIG.

  FIG. 4 is a flowchart showing control of storage battery 90 by HEMS 30 according to the present embodiment. In FIG. 4, the HEMS 30 has already acquired the information on the price plan such as electric lights for three hours and the information on the unit price of the electric charge of the price plan from the information center 80, and the price plan indicated by the acquired price plan information Is set.

  Further, the HEMS 30 calculates an electricity charge based on the power consumption amount of the building 10 based on the power consumption amount of the building 10 and the acquired unit price information of the electricity charge, and cumulatively stores the calculated electricity charge in the memory 50. It shall be remembered.

  In step 400, a scheduled discharge time that is a time for discharging the storage battery 90 is set. The scheduled discharge time is set according to the input from the operation unit 48 of the HEMS 30.

  In step 402, the highest charge time zone in which the unit price of the electricity charge is the highest in the set charge plan is extracted. The maximum charge time zone corresponds to, for example, the daytime time zone in FIG.

  In step 404, it is determined whether or not the scheduled charging time set in step 400 overlaps with the maximum charge time zone.

  FIG. 5 is an example of a case where the scheduled charging time overlaps the maximum charge time zone. In such a case, an affirmative determination is made in step 404.

  If the determination in step 404 is affirmative, in step 406, it is displayed on the display unit 46 that the setting of the estimated charging time is incorrect, and the process is terminated.

  If the determination in step 404 is negative, the electric charges before and after the scheduled charging time are set in step 408 are compared.

  As described above, in the present embodiment, the HEMS 30 calculates the electricity bill for the building 10 based on the power consumption of the building 10 and the unit price of the electricity bill, and stores it in the memory 50. In step 408, the electricity charges before and after the scheduled charging time setting stored in the memory 50 are compared.

  In step 410, it is determined whether or not the electricity bill has increased after the scheduled charging time is set. If the determination is affirmative, in step 406, the display unit 46 displays that the scheduled charging time is set incorrectly. To end the process.

  If the determination in step 410 is negative, the display unit 46 displays that the estimated charging time is properly set, and the process ends.

  As described above, in FIG. 4, it is determined whether or not the scheduled charging time of the storage battery 90 is set redundantly in the time zone where the electricity rate is the highest in the electricity rate plan, and the electricity before and after the setting is further determined. Appropriateness of the setting of the scheduled charging time is determined based on the change in charge.

  Thereby, it becomes possible to set the scheduled charging time of the storage battery 90 so that the electricity bill is low.

  In the comparison of the electricity charges before and after the scheduled charging time is set in step 408, the electricity charges calculated for the predetermined days before the scheduled charging time is set and the predetermined days after the scheduled charging time is set. You may make it compare with an electricity bill. The predetermined number of days may be an arbitrary number of days such as 3 to 7 days or one month.

  For example, by comparing a one-week electricity charge immediately before the scheduled charging time is set with a one-week electricity charge immediately after the scheduled charging time is set, whether or not the scheduled charging time is appropriate according to the actual power consumption of the building 10 Can be determined.

  In the present embodiment, the determination result in step 406 or 412 may be transmitted to the portable information terminal (not shown) via the network 60.

  In FIG. 4, the maximum charge time zone is extracted in step 402, but the lowest charge time zone where the charge is the lowest in the charge plan may be extracted.

  If the minimum charge time zone is extracted, an affirmative determination is made in step 404 if the scheduled charge time overlaps with the minimum charge time zone. If the electricity charge has not increased after the scheduled charge time setting, the estimated charge time setting is appropriate. Is determined.

  In the present embodiment, the scheduled charging time may be set automatically. FIG. 6 is a flowchart of processing for setting the scheduled charging time in the present embodiment.

  In FIG. 6, the HEMS 30 calculates the power generation amount of the solar power generation device 16 for each time zone based on the current value and voltage value measured by the solar power generation current / voltage sensor 54, and cumulatively stores them in the memory 50. Suppose you are. For example, the time zone may be one in which the unit time is 1 hour, but may be a time zone in which the unit time is 2 hours or more.

  In step 600, it is determined whether or not the set rate plan is a metered lamp in which the unit price of the electricity rate does not change with time.

  If the determination in step 600 is affirmative, in step 602, the transition of the power generation amount of the past solar power generation device 16 in the predetermined period from the memory 50 by time zone is acquired.

  The predetermined period may be, for example, the most recent week, the most recent month, or the same month in the previous year.

  In step 604, the average value of the power generation amount of the solar power generation device 16 in a predetermined period is calculated in each time zone, and a time zone in which the calculated average value is equal to or greater than a predetermined threshold is extracted.

  Although various methods can be considered for setting the predetermined threshold, it is only necessary to set a threshold that can extract a time zone in which the solar power generation device 16 can generate power. As an example, it is conceivable that 80% of the maximum value of the average value of the power generation amount in each time zone calculated in step 604 is set as the predetermined threshold value.

  In step 606, the time zone extracted in step 604 is set as the scheduled charging time, and the process ends.

  In the case of negative determination in step 600, that is, when the charge plan is a light by time zone in which the unit price of the electricity rate is different between daytime and nighttime, or a light by time zone in which the unit price of the electricity rate is different between daytime, morning and evening, and night In step 608, it is determined whether or not the nighttime electricity rate calculated from the nighttime power consumption and the unit price of the electricity rate is less than or equal to a threshold value.

  As an example, the night time zone may be from 23:00 to 5:00 the next morning.

  The threshold value in step 608 may be a value that can determine whether or not the nighttime electricity rate is higher than normal. For example, the threshold value may be an average value of the electricity rate of the building 10 in a predetermined period in a predetermined period. Conceivable.

  For example, when the predetermined period is one week and the unit time is one hour, the threshold value is a quotient obtained by dividing the electricity rate of the building 10 in the last week by 168.

  If the nighttime zone is 6 hours from 23:00 to 5am the next morning, determine whether the electricity bill for the nighttime zone exceeds 6 times the threshold when the unit time is 1 hour. .

  If the determination in step 608 is affirmative, the night time zone is set as the scheduled charging time in step 610, and the process ends.

  If a negative determination is made in step 608, it is determined in step 612 whether or not a time zone where the electricity rate is cheap can be extracted from the rate plan other than the night time zone.

  If the set rate plan is, for example, a 3-hour time zone lamp, then the morning and evening time zones with the lowest rates can be extracted after the night.

  If the determination in step 612 is affirmative, the time zone extracted in step 614 is set as the scheduled charging time, and the process ends.

  If the set price plan is, for example, a light by time zone, the time zone other than the night time zone has only the daytime, which is the highest charge time zone, so the time zone when the electricity rate is cheap other than the night time zone Cannot be extracted from the rate plan. In this case, a negative determination is made in step 612, the procedure is shifted to step 602, and a time zone in which power generation by the solar power generation device 16 can be performed is set as the scheduled charging time.

  As described above, according to the processing shown in FIG. 6, it is possible to automatically set the scheduled charging time in consideration of the power generation amount of the solar power generation device 16 and the power consumption amount at night.

  6 may be performed by the HEMS 30 or may be performed by the information center 80.

  For example, from the building 10, the information about the rate plan set in the HEMS 30, the power consumption amount of the building 10, the power generation amount of the solar power generation device 16, etc. from the network interface 34 of the HEMS 3 through the network 60. Send to. The information center 80 executes the process shown in FIG. 6 based on the received information.

10 Building 12 System power 14 Distribution board 16 Solar power generation device 30 HEMS
34 Network interface 36 CPU
38 ROM
40 RAM
46 Display Unit 48 Operation Unit 50 Memory 52 Current Sensor 54 Photovoltaic Current Voltage Sensor 56 Storage Battery Control Interface 60 Network 80 Information Center 90 Storage Battery

Claims (7)

A time setting means for setting a scheduled charging time for charging the storage battery;
An acquisition means for acquiring a charge plan with different electricity charges in time zones from an information center that manages information on electricity charges;
Rate plan setting means for setting the acquired rate plan;
Whether or not the scheduled charging time is set is determined based on whether or not the scheduled charging time set by the time setting means overlaps with an expensive time zone in the price plan set by the rate plan setter. A control means for determining that the scheduled charging time is erroneously set when the scheduled charging time overlaps with the expensive time zone;
A storage battery charge / discharge control device. It further comprises a power consumption measuring means for measuring the power consumption of the building,
The acquisition means further acquires information on the unit price of the electricity rate in each time zone of the rate plan set by the rate plan setting means from the information center,
The control means calculates the electricity bill based on the power consumption of the building based on the information on the power consumption of the building measured by the power consumption measuring means and the unit price of the electricity bill obtained by the acquisition means; Among the calculated electricity charges, it is determined whether or not the scheduled charging time is set by comparing the electricity charges before and after the scheduled charging time is set, and after the scheduled charging time is set, The storage battery charge / discharge control device according to claim 1, wherein, when the charge is increased, it is determined that the scheduled charging time is erroneously set.   The control means compares the power charge calculated in a predetermined number of days before the scheduled charging time is set with an electric charge calculated in a predetermined number of days after the scheduled charging time is set. The storage battery charge / discharge control device according to claim 2, wherein whether the setting of the scheduled charging time is appropriate is determined.   The control means is configured to set the time setting means to set the night time zone to the scheduled charging time when the electricity rate in the night time zone is equal to or less than a predetermined threshold among the calculated electricity rates. The storage battery charge / discharge control device according to claim 2 or 3 to be controlled.   The control means sets the time zone in which power generation by the solar power generator is possible as the scheduled charging time when the electricity rate in the night time zone exceeds a predetermined threshold among the calculated electricity rates. The storage battery charge / discharge control device according to claim 2 or 3, wherein the time setting means is controlled. A display means for displaying information;
The storage battery charge / discharge control apparatus according to any one of claims 1 to 5, wherein the control means causes the display means to display a determination result of whether the setting of the scheduled charging time is appropriate. A transmission means capable of transmitting the determination result to the mobile terminal;
The said control means transmits the determination result of the appropriateness | suitability of the setting of the said scheduled charging time via the said transmission means, and displays this determination result on the said portable terminal. Storage battery charge / discharge control device.

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