Electric power control system

Abstract

This power control system 100 comprises: a power conditioner 4 that switches between a plurality of charge / discharge states including at least a self-charging state in which a storage battery 3 is charged from a distributed power supply 1 and a discharging state in which the storage battery 3 is discharged to an electric load 92 of a consumer; a control unit 7 that controls a charge / discharge schedule for the storage battery 3; and a storage unit 10 that stores charge / discharge data in which the charge / discharge state of the storage battery 3 is time-linked. The control unit 7 specifies a charging completion time at which a switch is made from the self-charging state to the discharging state on the basis of the charge / discharge data, determines the charging rate in the self-charging state so that the SOC value assumes a target SOC value at the charging completion time, and controls the power conditioner 4 so that the charge / discharge state is switched according to the charge / discharge schedule.

Description

Power control system

[0001] The present disclosure relates to a power control system.

[0002] Patent Document 1 discloses a charging control method for a storage battery installed in a residence. In this residence, grid interconnection between a commercial power source and a photovoltaic power generation system is implemented. The storage battery is charged from the commercial power source or the photovoltaic power generation system. The stored electric power is consumed by the electrical load of the residence as needed.

[0003] In carrying out this method, a controller sets one of a plurality of operation modes to control charging and discharging of the storage battery. For example, when there is a sign that a power outage will occur in the commercial power grid due to the occurrence of a disaster or the like, the controller sets the operation mode of the storage battery to a typhoon mode, and charging is started to secure a sufficient remaining capacity in the storage battery.

[0004] Japanese Patent Application Laid-Open No. 2012-130096

[0005] It is considered that how a user uses a storage battery varies from individual user to individual user. However, the above controller merely controls charging and discharging in accordance with pre-programmed operation modes.

[0006] An object of the present disclosure is to optimize charging and discharging control of a storage battery in accordance with individual usage patterns of users.

[0007] One aspect of the present disclosure is a power control system for grid connection between a commercial power source and a distributed power source provided at a consumer, comprising: a battery connectable to the commercial power source, the distributed power source, and the consumer's electrical load; a switching unit for switching between a plurality of charge / discharge states, including at least a self-charging state in which the battery is charged from the distributed power source and a discharge state in which the battery is discharged to the consumer's electrical load; a control unit for controlling the charge / discharge schedule of the battery; and a storage unit for storing charge / discharge data linked to the charge / discharge states of the battery and time, wherein the control unit is stored in the storage unit. The present invention provides a power control system configured to determine, as part of the charge-discharge schedule, the time at which the charge completion of the customer's battery will be switched from the self-charging state to the discharge state, based on the charge-discharge data, within a 24-hour unit time range; to determine, as part of the charge-discharge schedule, the charging speed of the battery in the self-charging state, so that the state of charge (SOC) of the battery reaches a predetermined target SOC value at the charge completion time; and to control the switching unit so that the charge-discharge state of the battery is switched according to the charge-discharge schedule.

[0008] According to this disclosure, the charging and discharging control of the battery can be optimized according to the individual user's usage.

[0009] A block diagram of the power control system according to the embodiment. A block diagram of the control unit and memory unit of Figure 1. A diagram showing an example of the charge / discharge database of Figure 2. A diagram showing an example of the schedule database of Figure 2. A diagram showing an example of the charge rate table of Figure 2. A diagram showing an example of the target SOC value setting of Figure 2. A diagram showing an example of the seasonal information table of Figure 2. A diagram showing an example of the seasonal setting table of Figure 2. A flowchart showing the charge / discharge schedule setting change process executed by the control unit of Figure 1. A graph showing an example of charge / discharge data of Figure 2.

[0010] Embodiments will be described below with reference to the drawings. The same or corresponding elements are denoted by the same reference numerals throughout the drawings, and redundant detailed descriptions will be omitted.

[0011] The power control system according to this embodiment is a power control system that connects a commercial power source to a distributed power source provided at a consumer, and comprises: a battery connectable to the commercial power source, the distributed power source, and the consumer's electrical load; a switching unit that switches between a plurality of charge / discharge states, including at least a self-charging state in which the battery is charged from the distributed power source and a discharge state in which the battery is discharged to the consumer's electrical load; a control unit that controls the charge / discharge schedule of the battery; and a storage unit that stores charge / discharge data linked to the charge / discharge states of the battery and time. The system is configured to, based on the charge and discharge data stored in the memory unit, identify a charge completion time within a 24-hour unit time range for switching the customer's battery from the self-charging state to the discharge state as part of the charge and discharge schedule, determine the charging speed of the battery in the self-charging state as part of the charge and discharge schedule so that the battery's SOC value reaches a predetermined target SOC value at the charge completion time, and control the switching unit so that the charge and discharge state of the battery switches according to the charge and discharge schedule.

[0012] According to the above configuration, the charging completion time for each customer's battery is determined based on the charging and discharging data acquired for that customer. The charging speed is determined so that the battery's State of Charge (SOC) reaches the target value at this charging completion time. Therefore, the charging and discharging schedule is determined according to how each user uses their battery. The charging and discharging state of the battery can be optimized according to each user's demand, thereby extending the battery's lifespan.

[0013] In other embodiments, the charge / discharge data may include time-series data of current values ​​flowing into or from the battery, and the control unit may determine the charging completion time from the time-series data of current values.

[0014] In other embodiments, the charge / discharge data may include time-series data of the depth of discharge of the battery, and the control unit may set the target SOC value according to the depth of discharge.

[0015] In other embodiments, the charge / discharge data includes time-series data of the SOC value of the storage battery, and the control unit may determine, for each of the multiple analysis days, whether the SOC value has reached the target SOC value at the time of charge completion, and based on the result of that determination, decide whether to increase, decrease, or maintain the charging speed.

[0016] In other embodiments, the control unit may adjust the charging speed according to at least one of weather information, seasonal information, and temperature information.

[0017] In other embodiments, the control unit may set different charge and discharge schedules for weekdays and holidays.

[0018] The following describes specific examples of this disclosure in detail based on the drawings. In the following description, terms indicating specific directions or positions (e.g., "up," "down," and other terms including these) will be used as needed. The use of these terms is for the purpose of facilitating understanding of the disclosure with reference to the drawings, and the meaning of these terms does not limit the technical scope of this disclosure. Also, parts with the same reference numerals appearing in multiple drawings indicate the same or equivalent parts or components. Furthermore, the embodiments shown below are examples of the technical concept of this disclosure and do not limit this disclosure to them. In addition, the dimensions, materials, shapes, relative arrangements, etc. of the components described below are intended to be illustrative, and not to limit the scope of this disclosure unless specifically stated. Also, the content described in one embodiment or example is applicable to other embodiments or examples. Furthermore, the size and positional relationships of the components shown in the drawings may be exaggerated for clarity in the explanation.

[0019] Referring to Figure 1, the power control system 100 connects the distributed power source 1, which is installed in the customer's house 91 or on its premises, to the commercial power grid 2. The customer's house 91 is equipped with electrical appliances such as household appliances as electrical loads 92 that consume electricity.

[0020] Distributed power source 1 is, as an example, a photovoltaic power generation device having a solar cell consisting of a large number of solar cells. The solar cell is installed, for example, on the roof of a house 91 and generates electricity by receiving sunlight. Due to this property, the solar cell can generate electricity during the time of day when sunlight is shining on it (hereinafter sometimes simply referred to as "daytime"). Distributed power source 1 may also be a power generation device that utilizes renewable energy such as a wind power generation device or a small hydroelectric power generation device, or it may be a fuel cell or a cogeneration device.

[0021] The power control system 100 includes a storage battery 3. The storage battery 3 is a rechargeable secondary battery, such as a lithium-ion battery, nickel-metal hydride battery, or lead-acid battery. The secondary battery is composed of a plurality of battery cells 30. The storage battery 3 is installed in the customer's house 91 or on its premises.

[0022] The power control system 100 further comprises a power conditioner 4, a distribution board 5, and an electric meter 6. The power conditioner 4 constitutes part of the distributed power source 1. The power conditioner 4 is connected to the power generation elements of the distributed power source 1 (solar cell modules in the above example), the storage battery 3, and the distribution board 5. The distribution board 5 is connected to the commercial power grid via the electric meter 6 and is also connected to the electrical load 92. The distribution board 5 is further connected to the power conditioner 4. The electric meter 6 is interposed on the power system 2 and measures the power received from the commercial power source (i.e., power purchased from the power supplier) and the power that has been reverse-flowed into the commercial power system 2 (i.e., power sold to the power supplier). The power control system 100 can measure the power consumption of the electrical load 92 using the electric meter 6 alone, or by using another meter in place of or in addition to the electric meter 6.

[0023] The power conditioner 4 has the functions of converting DC to AC, switching the power supply state of the distributed power source 1 (i.e., the destination of the power generated by the distributed power source 1), and switching the charge and discharge state of the storage battery 3. In order to act as a switching unit for switching the charge and discharge state, the power conditioner 4 has multiple switches (not shown) interposed on the wiring for interconnecting the power generation elements of the distributed power source 1, the storage battery 3, and the distribution board 5.

[0024] The power supply states of the distributed power source 1 include a self-charging state in which the power generated by the distributed power source 1 is supplied to the storage battery 3, a self-consumption state in which the DC power generated by the distributed power source 1 is converted to AC power and supplied to the electrical load 92, and a reverse power flow state in which the DC power generated by the distributed power source 1 is converted to AC power and flowed back to the power grid 2.

[0025] These conditions can occur simultaneously. For example, around noon on a sunny summer day, the amount of power generated per unit time by the distributed power source 1 increases. In such a case, the power generated by the distributed power source 1 may be supplied to the electrical load from the power conditioner 4 via the distribution board 5, and may also be supplied from the power conditioner 4 to the storage battery 3.

[0026] The charging and discharging states of the battery 3 include a charging state in which the battery 3 is charged, and a discharging state in which the DC power stored in the battery 3 is converted to AC power and then discharged to the distribution board 5 and subsequently to the electrical load 92. The charging state includes the above-mentioned self-charging state and an external charging state in which the battery 3 is charged with power supplied from the commercial power source. The self-charging state and the external charging state can occur simultaneously. In the external charging state, the AC power from the commercial power source is converted to DC power by the power conditioner 4 or a separately provided converter and then supplied to the battery 3.

[0027] In this way, the battery 3 can store surplus power, which is obtained by subtracting the power consumed by the electrical load 92 from the power generated by the distributed power source 1, and which is not fed back into the power grid 2. In addition, the battery 3 can supply power to the electrical load 92 as needed.

[0028] The power control system 100 includes a control unit 7. The control unit 7 includes a controller 8 and a server device 9. Both the controller 8 and the server device 9 are computers, which are the main components of the apparatus, system, or method according to this embodiment. The functions of the main components of the apparatus, system, or method in this disclosure are realized by the computer executing a program. The computer has a processor as its main hardware configuration, which operates according to a program. The processor can be of any type as long as it can realize its functions by executing a program. The processor consists of one or more electronic circuits, including a semiconductor integrated circuit (IC) or a large-scale integration (LSI). Here, we refer to them as ICs and LSIs, but the name changes depending on the degree of integration, and they may also be called system LSIs, VLSIs (very large-scale integrations), or ULSIs (ultra-large-scale integrations). Field programmable gate arrays (FPGAs), which are programmed after the manufacture of the LSI, or reconfigurable logic devices that can reconfigure the junction relationships inside the LSI or set up the circuit compartments inside the LSI, can also be used for the same purpose. Multiple electronic circuits may be integrated onto a single chip or provided on multiple chips. Multiple chips may be integrated into a single device or provided on multiple devices. The program is recorded on a non-temporary recording medium such as a computer-readable ROM, optical disc, or hard disk drive. The program may be pre-stored on the recording medium or supplied to the recording medium via a wide-area communication network, including the Internet.

[0029] The controller 8 is individually assigned to each customer and is installed in the customer's house 91. The controller 8 is communicatively connected to the server device 9 via a telecommunications line 93. The server device 9 is located outside the house 91 and centrally controls the charging and discharging of the storage batteries 3 installed in each of the multiple customers. The server device 9 may be implemented in a virtual environment on the cloud. The controller 8 works in cooperation with the server device 9 to control the charging and discharging of the storage batteries 3 installed in the corresponding house 91.

[0030] The input / output interface 8b of the controller 8 is connected to the battery 3 and the electric meter 6, and acquires data or information necessary for control from the battery 3 and the electric meter 6. The power control system 100 may be equipped with sensors on the wiring connecting its components that detect electrical characteristics such as current and voltage. Examples of such sensors include a voltage sensor provided on the secondary side of the electric meter 6 and a current sensor provided between the battery 3 and the power conditioner 4. In such cases, the controller 8 is also connected to the sensors and acquires information output from the sensors.

[0031] The input / output interface 8b of the controller 8 is connected to the power conditioner 4 and controls the operation of the power conditioner 4. For example, the controller 8 controls the operation of switches on the power conditioner 4, thereby controlling the setting and switching of the charge and discharge state of the battery 3.

[0032] For example, the processing unit 8a of the controller 8 controls the operation of the switch on the power conditioner 4 so that the charge / discharge state becomes self-charging when the preset charging start time arrives. As a result, charging of the storage battery 3 begins from the charging start time.

[0033] The power control system 100 includes a storage unit 10 that stores data and information for controlling the charging and discharging of the storage battery 3. The storage unit 10 constitutes part of the control unit 7. The storage unit 10 includes a battery storage unit 11 built into the housing of the storage battery 3, a controller storage unit 12 that constitutes the storage area of ​​the controller 8, and a server storage unit 13 that constitutes the storage area of ​​the server device 9. In terms of storage capacity, the battery storage unit 11 has the smallest capacity, and the server storage unit 13 has the largest capacity.

[0034] The memory unit 10 stores charge / discharge data that links the charge / discharge state of the storage battery 3 to time. The associated "time" includes not only time data representing hours, minutes, and seconds, but also calendar data representing year, month, and day.

[0035] As data indicating the "charge / discharge state," the current value flowing into or from the battery 3 can be used as an example. When the current value is positive, the battery 3 is in a discharge state, and when the current value is negative, the battery 3 is in a charging state (see Figure 5). The method for generating charge / discharge data related to the current value is not particularly limited. For example, the controller 8 may sequentially acquire the current value as an example of a physical quantity representing the charge / discharge state from a current sensor at a predetermined sampling period (e.g., several milliseconds), and store the acquired current value in the controller storage unit 12, linked to the acquisition time.

[0036] Examples of data indicating the "charge / discharge state" include the State of Charge (SOC) value and / or Depth of Discharge (DoD) value. The SOC and DoD values ​​may be measured by a battery management unit (BMU) built into the battery, or by a controller.

[0037] In this embodiment, as merely one example, charge and discharge data stored in the controller 8 is uploaded to the server device 9 at a predetermined interval (for example, every day), and the server storage unit 13 stores the charge and discharge data for each customer on an annual basis as a charge and discharge database 21 (see Figures 2 and 3A). In the above example, current value time series data, SOC time series data, and DoD time series data are uploaded to the server device 9.

[0038] The server device 9, as part of the control unit 7, analyzes the charge and discharge data stored in the server storage unit 13 and performs a process to determine the charge and discharge schedule for each customer. The "charge and discharge schedule" here includes the time when the battery 3 switches from a self-charging state to a discharge state, the charging speed (also called the charge rate) of the battery 3 while it is in the self-charging state, and the target SOC (state of charge) value of the battery 3 at the time of charge completion.

[0039] In this embodiment, the charge-discharge schedule is not uniform in order to extend the lifespan of the battery 3 by controlling the charge and discharge to suit the individual lifestyle of each customer. For example, the charge-discharge schedule is set separately for weekdays (Monday to Friday, excluding holidays) and holidays (Saturday, Sunday, and public holidays). Note that unless you are on the equator, the time of sunset, sunrise, and daylight hours fluctuate throughout the year, while the charge-discharge schedule is updated much more frequently (for example, once a week) than seasonal changes (roughly speaking, four times a year). Therefore, each time it is updated, the charge-discharge schedule is set to match the diurnal motion.

[0040] In this embodiment, as merely one example, the charging start time is determined according to the sunrise time, which is determined by the installation location (latitude and longitude) of the battery 3. However, in other embodiments, the charging start time may also be subject to schedule adjustment.

[0041] Referring to Figure 2, the storage unit 10 (server storage unit 13) has a schedule database 22 that stores information about the currently set charge and discharge schedule for each customer, in addition to the charge and discharge database 21 described above. The storage unit 10 (server storage unit 13) also stores a charge rate table 31, a target SOC value setting table 32, a seasonal information table 33, and a seasonal setting table 34. The control unit 7 (server processing unit 9a of the server device 9) refers to these tables stored in the storage unit 10 (server storage unit 13) and executes a process to determine the charge and discharge schedule. When the charge and discharge schedule is changed, the information in the schedule database 22 is updated.

[0042] Referring to FIG. 3C, the charging rate table 31 defines the correspondence between a plurality of rate modes and a plurality of rate values. The plurality of rate modes have different charging speeds from each other. For example, the plurality of rate modes include a first mode, a second mode, a third mode, .... The rate value is a numerical value expressed in kW. In the illustrated example, a mode with a smaller ordinal number is a mode with a larger rate value (that is, a faster charging speed), but this is merely an example.

[0043] Referring to FIG. 3D, the target SOC value setting table 32 defines the correspondence between the average DoD value, the charging speed (or rate mode), and the target SOC value. The higher the average DoD value and the higher the charging speed, the higher the target SOC value.

[0044] Referring to FIG. 3E, the season information table 33 defines the correspondence between the customer's region and season mediating information. Referring to FIG. 3F, the season setting table 34 shows the season mediating information associated with a region, and season information indicating which month belongs to which season. There is no particular limitation on the unit for dividing regions. As just an example in the present country, regions may be divided in units of weather forecast districts (narrower than prefecture units and wider than city units). In this case, control based on weather information corresponding to the customer's region can be facilitated.

[0045] In the illustrated example, the region code "001" corresponds to the season mediating information "A000", and the season information corresponding to the season mediating information "A000" indicates that "November to March are winter, July to August are summer, and April to June and September to October are normal". The region indicated by the region code "001" is at a relatively high latitude, with short summer and autumn and long winter. On the other hand, the region code "002" corresponds to the season mediating information "B000", and the season information corresponding to the season mediating information "B000" indicates that "December to February are winter, June to September are summer, and March to May and October to November are normal". The region indicated by the region code "002" is at a relatively low latitude, with short autumn and winter and long summer. The region code is stored in a battery storage unit. Further, the region code may be associated with a customer identification number in the charging / discharging database 21 or the schedule database 22.

[0046] The target SOC value table defines the correspondence between the average DoD value, the charging speed (or rate mode), and the target SOC value. The higher the average DoD value and the higher the charging speed, the higher the target SOC value. The average DoD value is calculated by the server processing unit 9a of the server device 9 based on the DoD time-series data stored in the server storage unit 13.

[0047] Note that a part of the above database or table may be stored in the battery storage unit 11 or the controller storage unit 12. For example, the seasonal information table 33 may be stored in the battery storage unit 11 or the controller storage unit 12.

[0048] Hereinafter, with reference to FIG. 4 and FIG. 5, the charge-discharge schedule determination process executed by the control unit 7 will be described. The following process is executed for one consumer. The control unit 7 executes the same process for each of a plurality of consumers. Although the process cycle is not particularly limited, as an example, the process may be executed once a week on a predetermined day of the week.

[0049] As shown in FIG. 4, the control unit 7 (the server processing unit 9a of the server device 9) specifies, based on the charge-discharge data stored in the charge-discharge database 21 of the storage unit 10 (the server storage unit 13), a charging completion time at which the storage battery 3 is fully charged within a 24-hour unit time range (step S1).

[0050] FIG. 5 shows one-day charge-discharge data, particularly time-series data of current values. From this time-series data, the control unit 7 detects a time at which the sign of the current value reverses, and specifies this time as the charging completion time. Note that the charging completion time is substantially synonymous with the discharge start time.

[0051] In step S1, the control unit 7 performs the above process with a plurality of recent days as analysis target days. The control unit 7 acquires the charging completion time corresponding to each analysis target day, and obtains a representative value from the plurality of acquired charging completion times. The representative value may be, for example, an average value of the plurality of charging completion times, or may be a median value.

[0052] The days to be analyzed may be multiple consecutive days. When different charge / discharge schedules are set for weekdays and holidays, when determining the time of completion of charging on weekdays, the days to be analyzed may be multiple weekdays in the immediate vicinity (for example, the five days of the most recent Friday, Thursday, Wednesday, Tuesday, and Monday). When determining the time of completion of charging on holidays, the days to be analyzed may be multiple holidays in the immediate vicinity (for example, the five days of the most recent Sunday, Saturday, the Sunday and Saturday of the previous week, and the Sunday of the week before that).

[0053] Returning to Figure 4, the control unit 7 (server processing unit 9a of the server device 9) acquires the currently set rate mode based on the charge / discharge schedule information stored in the schedule database 22 of the storage unit 10 (server storage unit 13) (step S2).

[0054] Next, the control unit 7 (server processing unit 9a of the server device 9) refers to the charge / discharge database 21 of the storage unit 10 (server storage unit 13) and selects the most recent several days as the analysis target days to obtain the SOC value at the time of charge completion (step S3). The analysis target days here may be the same as the analysis target days in the identification of the charge completion time (step S1).

[0055] Next, the control unit 7 determines whether there are many days when the SOC value is less than 100% at the time of charging completion (step S4). As just one example, if the number of days when the SOC value is less than 100% is more than half of the most recent days, it may be determined that there are "many" such days.

[0056] If the SOC value is below 100% on many days (S4: YES), the control unit 7 changes the charging speed to be higher than the current setting (step S5). In this example, the control unit 7 changes the rate mode so that a mode with an ordinal number one less than the currently set mode is set.

[0057] On the other hand, if there are few or no days in which the SOC value is less than 100% (S4: NO), the control unit 7 determines whether there are many days in which the SOC value reached 100% before the charging completion time (step S6). "Before the charging completion time" is merely an example and could be one hour before the charging completion time. The number of days may be determined, as above, by whether it is more than half of the most recent multiple days.

[0058] If the SPC value reaches 100% before the charging completion time on many days (S6: YES), the control unit 7 changes the charging speed to a lower setting than the current setting (step S7). In this example, the control unit 7 changes the rate mode so that a mode with an ordinal number one higher than the currently set mode is set.

[0059] In this way, the control unit 7 determines whether to increase, decrease, or maintain the charging speed based on the SOC values ​​for the past several days. Subsequently, the control unit 7 performs a process to fine-tune the charging speed and the target SOC value (step S8).

[0060] In this adjustment process (step S8), the control unit 7 may, for example, refer to weather information for the day to be analyzed. If there are many days that are not sunny, the control unit 7 may make fine adjustments to increase the charging speed. Weather information includes not only weather information such as sunny or rainy, but also temperature information. When the temperature is high, the control unit 7 may adjust to lower the target SOC value in order to prevent overcharging. Furthermore, the control unit 7 may adjust the charging speed and / or target SOC value according to seasonal information. When the temperature is high, the control unit 7 may adjust to slow down the charging speed or lower the target SOC value in order to suppress the temperature rise of the storage battery 3 and consequently the progression of its deterioration.

[0061] The control unit 7 may, for example, set a target SOC value according to the average DoD value for the day to be analyzed. As mentioned above, the higher the average DoD value and the higher the charging speed, the higher the target SOC value will be set.

[0062] In the adjustment process (step S8), the control unit 7 may change the rate mode when adjusting the charging speed. Alternatively, the currently set rate value may be corrected by multiplying or dividing the currently set rate value by a correction coefficient or by adding or subtracting a correction amount.

[0063] Through the above process, the charging completion time, charging speed, and target SOC value are determined and stored in the schedule database 22 (step S9). The schedule information is also transmitted to the controller 8 (step S10). If different schedules are set for weekdays and holidays, the analysis target day is changed and the same process is performed for both weekdays and holidays.

[0064] The processing unit 8a of the controller 8 controls the charging and discharging state of the battery 3 according to the charging and discharging schedule set up this time, until the next schedule update. In other words, the controller 8 controls the operation of the power conditioner 4 switch according to the charging and discharging schedule.

[0065] According to this embodiment, the charging completion time for the battery 3 of a particular customer is determined based on the charging and discharging data acquired for each customer. The charging speed is determined so that the State of Charge (SOC) value of the battery 3 reaches the target value at this charging completion time. Therefore, the charging and discharging schedule is determined according to how each user uses the battery 3. The charging and discharging state of the battery 3 can be optimized according to the individual user's needs, thereby extending the lifespan of the battery 3.

[0066] The above embodiments are merely examples, and the above configurations can be modified as appropriate within the scope of this disclosure.

[0067] In the above embodiment, the control unit 7 is composed of a controller 8 and a server device 9, but it may also be composed of only the controller 8 located near the storage battery 3. Similarly, the storage unit 10 may be composed of only the battery storage unit 11 and the controller storage unit 12. When the control unit 7 is composed of the controller 8 and the server device 9, some of the information stored in the server device 9 in the above embodiment may be stored in the controller storage unit 12.

[0068] In the above embodiment, the charging start time was set according to the region and season, but the charging start time may also be adjusted according to how the user uses the device (in other words, based on the charge / discharge data of each customer).

[0069] In the above embodiment, seasonal information was identified according to the customer's region using the seasonal information table 33. However, if geographic information can be obtained by other means such as GPS, the seasonal information table 33 may be omitted.

[0070] This disclosure may include the following embodiments: (Embodiment 1) A power control system for grid connection between a commercial power source and a distributed power source provided at a customer, comprising: a battery connectable to the commercial power source, the distributed power source, and the customer's electrical load; a switching unit for switching between a plurality of charge / discharge states, including at least a self-charging state in which the battery is charged from the distributed power source and a discharge state in which the battery is discharged to the customer's electrical load; a control unit for controlling the charge / discharge schedule of the battery; and a storage unit for storing charge / discharge data that links the charge / discharge states of the battery to time, wherein the control unit, based on the charge / discharge data stored in the storage unit, identifies a charging completion time for switching the customer's battery from the self-charging state to the discharge state within a 24-hour unit time range as part of the charge / discharge schedule, and determines the charging speed of the battery in the self-charging state as part of the charge / discharge schedule so that the SOC value of the battery becomes a predetermined target SOC value at the charging completion time. A power control system configured to control the switching unit so that the charge / discharge state of the storage battery switches according to the charge / discharge schedule. (Aspect 2) The power control system according to aspect 1, wherein the charge / discharge data includes time-series data of current values ​​flowing into or from the storage battery, and the control unit identifies the charging completion time from the time-series data of current values. (Aspect 3) The power control system according to aspect 1 or 2, wherein the charge / discharge data includes time-series data of the depth of discharge of the storage battery, and the control unit sets the target SOC value according to the depth of discharge. (Aspect 4) The power control system according to any one of aspects 1 to 3, wherein the charge / discharge data includes time-series data of the SOC value of the storage battery, and the control unit determines whether the SOC value has reached the target SOC value at the charging completion time for each of a plurality of analysis target days, and determines whether to increase, decrease, or maintain the charging speed based on the determination result. (Aspect 5) The power control system according to any one of aspects 1 to 4, wherein the control unit adjusts the charging speed according to at least one of weather information, seasonal information, and temperature information.(Aspect 6) The power control system according to any one of aspects 1 to 5, wherein the control unit sets different charge and discharge schedules for weekdays and holidays.

[0071] 1. Distributed power source 2. Power grid 3. Storage battery 4. Power conditioner 5. Distribution board 6. Electric meter 7. Control unit 8. Controller 8a. Processing unit 8b. Input / output interface 9. Server device 9a. Server processing unit 10. Memory unit 11. Battery memory unit 12. Controller memory unit 13. Server memory unit 21. Charge / discharge database 22. Schedule database 30. Battery cell 31. Charge rate table 32. Target SOC value setting table 33. Seasonal information table 34. Seasonal setting table 91. House 92. Electrical load 93. Telecommunication line 100. Power control system

Claims

1. A power control system for grid connection between a commercial power source and a distributed power source provided at a customer, comprising: a battery connectable to the commercial power source, the distributed power source, and the customer's electrical load; a switching unit for switching between a plurality of charge / discharge states, including at least a self-charging state in which the battery is charged from the distributed power source and a discharge state in which the battery is discharged to the customer's electrical load; a control unit for controlling the charge / discharge schedule of the battery; and a storage unit for storing charge / discharge data that links the charge / discharge states of the battery to time, wherein the control unit, based on the charge / discharge data stored in the storage unit, identifies a charging completion time for switching the customer's battery from the self-charging state to the discharge state within a 24-hour unit time range as part of the charge / discharge schedule, and determines the charging speed of the battery in the self-charging state as part of the charge / discharge schedule so that the SOC value of the battery becomes a predetermined target SOC value at the charging completion time. A power control system configured to control the switching unit so that the charge / discharge state of the storage battery switches according to the charge / discharge schedule.

2. The power control system according to claim 1, wherein the charge / discharge data includes time-series data of current values ​​flowing into or from the storage battery, and the control unit determines the charging completion time from the time-series data of current values.

3. The power control system according to claim 1, wherein the charge / discharge data includes time-series data of the depth of discharge of the storage battery, and the control unit sets the target SOC value according to the depth of discharge.

4. The power control system according to claim 1, wherein the charge / discharge data includes time-series data of the SOC value of the storage battery, and the control unit determines, for each of a plurality of analysis target days, whether the SOC value has reached the target SOC value at the time of charge completion, and based on the result of that determination, whether to increase, decrease, or maintain the charging speed.

5. The power control system according to claim 1, wherein the control unit adjusts the charging speed according to at least one of weather information, seasonal information, and temperature information.

6. The power control system according to any one of claims 1 to 5, wherein the control unit sets different charge and discharge schedules for weekdays and holidays.

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