JP6643895B2 - Control device, storage battery management system, and control method for controlling charging of storage battery - Google Patents

Description

  The present disclosure relates to a control device, and more specifically, to a control device for charging a storage battery.

  In recent years, due to the widespread use of photovoltaic power generation in the world, reverse power flow from consumers to power companies has increased. As a result of an increase in reverse power flow flowing through the power system, it has become difficult to maintain power quality in the power system. For this reason, each electric power company plans to limit (restrict output) reverse power flow from consumers (Non-Patent Document 1). When each electric power company introduces an output limit, consumers will be able to sell a part of the amount of power that could be sold in the past if electricity sales were limited and surplus solar power was generated. become unable.

  Japanese Patent Application Laid-Open No. 2012-175791 (Patent Document 1) discloses a power supply system that can be used efficiently without reverse power flow even when a surplus of photovoltaic power generation occurs. Specifically, by setting the predicted power storage amount using the predicted power amount and the predicted power generation amount, the power storage amount in the midnight time period, which is a specific time zone, is minimized, and the surplus by the solar power generator is stored in the storage battery. Is controlled to store power.

JP 2012-175791 A

"Technical specifications of PCS with output control function", [online], Photovoltaic Power Generation Association, Japan Electrical Manufacturers' Association, Federation of Electric Power Companies, [Search on July 31, 2015], Internet <URL: http: // www.meti.go.jp/committee/sougouenergy/shoene_shinene/shin_ene/keitou_wg/pdf/005_02_00.pdf>

  However, although the selling of power is restricted by the output limitation, what cannot be sold is a part of the amount of power that can be sold conventionally, and a part can be sold. Therefore, the technology disclosed in Patent Literature 1 does not consider the amount of power sold (the amount of power that can be sold to a power company) in the amount of power generated by a consumer, and is suitable for controlling a storage battery when output is limited. Absent.

  The present disclosure has been made in order to solve the above-described problems, and an object in one aspect is to provide a storage battery control device capable of efficiently using a storage battery when output is limited, and An object of the present invention is to provide a storage battery system to which a control device is applied. It is still another object of the present invention to provide a method of controlling a storage battery that can efficiently use the storage battery when the output is limited.

  A control device according to one embodiment is a control device that performs charge / discharge control of a power generation device using natural energy and a storage battery that stores power supplied from a power system, and limits reverse power flow to the power system of the power generation device. A storage unit that stores the output restriction information, and a control unit, wherein a predetermined time period in which a charge is set lower than at least another time period is determined for the amount of power supplied from the power system. ing. The control unit determines, based on the output restriction information, whether or not the output is restricted during the daytime of a certain day, and controls the increase or decrease of the charge amount of the storage battery in a predetermined time zone before the daytime of the certain day.

  According to the control device according to the embodiment, when the output is limited, the storage battery can be used efficiently.

It is a figure explaining the composition of the power generation system according to an embodiment. FIG. 3 is a diagram illustrating a configuration of a control device according to the embodiment. FIG. 9 is a diagram illustrating output restriction information. It is a figure explaining the control flow of the charge of the storage battery according to an embodiment. It is a figure explaining an update schedule. FIG. 7 is a diagram for describing prediction of whether or not output restriction according to the embodiment is relaxed. FIG. 9 is a diagram illustrating a control flow of charging a storage battery according to another embodiment. FIG. 11 is a diagram illustrating charge control of a storage battery according to still another embodiment. FIG. 11 is a diagram illustrating a control flow of charging a storage battery according to still another embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding portions have the same reference characters allotted, and description thereof will not be repeated.

[A. Embodiment 1]
(A1. Configuration example of the power generation system 1)
FIG. 1 is a diagram illustrating a configuration of a power generation system. As illustrated in FIG. 1, the power generation system 1 includes a power conditioner 10, a storage battery management system 100, a distribution board 50, a CT (Current Transformer) sensor 60, and a solar cell module 70. The storage battery management system 100 includes a storage battery 20, a control device 30, and a communication device 40.

  The power conditioner 10 is connected to a storage battery 20, a control device 30, a distribution board 50, and a solar cell module 70. The power conditioner 10 converts DC power generated by the solar cell module 70 into AC power. The power conditioner 10 supplies the converted AC power to the distribution board 50. Further, in a case where the power generated by the self-power generation using the solar cell module 70 is larger than the power consumed by the consumer, the power conditioner 10 allows the surplus power to flow to the power system of the power company as necessary (reverse power flow). Or power is supplied to the storage battery 20. The power conditioner 10 measures the amount of electric power generated by the solar cell module 70 and outputs the measured amount to the control device 30.

  The storage battery 20 stores power supplied from the solar cell module 70 (power generation device) and the power system. The storage battery 20 includes a measuring device for measuring the remaining amount of the storage battery. The storage battery 20 measures the remaining amount of the storage battery and outputs it to the control device 30.

  In this example, a solar power generation device is used as the power generation device, but any power generation device using natural energy may be used. Examples of natural energy include photovoltaic power generation, hydroelectric power generation, biomass power generation, biofuel power generation, geothermal power generation, tidal power generation, ocean current power generation, wave power generation, and wind power generation.

  FIG. 2 is a diagram illustrating the configuration of the control device. As shown in FIG. 2, the control device 30 includes a communication interface 32, a control unit 34, and a storage unit 36. The storage unit 36 is a nonvolatile memory element. For example, a flash memory, a ReRAM (Resistance Random Access Memory), an MRAM or a FeRAM (Ferroelectric Random Access Memory) may be used. The storage unit 36 stores a power sale price set by the power company and a power purchase price divided into time zones. Further, the storage unit 36 stores output restriction information for restricting reverse power flow to the power system.

  Referring to FIG. 1 again, the power conditioner 10 and the communication device 40 are connected to the control device 30 via the communication interface 32. The control device 30 controls charging and discharging of the storage battery 20 via the power conditioner 10.

  The communication device 40 is connected to the Internet 80. The communication device 40 acquires output restriction information periodically distributed by the power company to the power consumers via the Internet 80. The communication device 40 outputs the obtained information to the control device 30 in response to a request from the control unit 34.

  The CT sensor 60 measures the amount of power consumed by the consumer. The CT sensor 60 is connected to one of a main breaker and a branch breaker of the distribution board 50. When the CT sensor 60 is connected to the main breaker of the distribution board 50, the CT sensor 60 measures the power consumption of the entire customer. Further, when the branch breaker corresponds to the entire room and the CT sensor 60 is connected to the branch breaker of the distribution board 50, the CT sensor 60 measures the power consumption of the entire room.

(A2. Output restriction information)
Next, output restriction information for restricting reverse power flow to the power system of the power generator will be described. The output restriction information is information on restriction of reverse power flow of power generated by the power generation system 1 to the power system. FIG. 3 is a diagram illustrating output restriction information including information on a restriction amount (suppression amount). The limit amount is an amount related to the upper limit of the power that can be sold with respect to the output of the power generation system 1. The upper limit value is represented by, for example, a ratio of power that can be sold to the capacity of the power generation system 1 or a ratio of power that can be sold to the output of the power generation system 1. Referring to FIG. 3A, the generated power (W) is plotted on the vertical axis, and time is plotted on the horizontal axis. In FIG. 3A, an output upper limit value for each day is shown as an example of the limit amount. In FIG. 3A, the “output upper limit value” refers to the ratio of the power that can be sold to the output of the power generation system 1 with respect to the restriction of the reverse power flow power. In another aspect, the limit amount may be an output upper limit value for each time.

  In FIG. 3A, a line L <b> 1 indicates generated power per unit time on August 21, 2015 when the solar cell module 70 is used. A line L2 indicates the output upper limit value at each time on August 21, 2015.

  In FIG. 3A, the output upper limit value from 0:00 to 24:00 on August 21, 2015 is 40%. Therefore, on August 21, 2015, the consumer can sell 40% of the power of the output of the power generation system 1 to the power company.

  The output restriction information is determined based on the fixed schedule and the update schedule distributed by the power company. FIG. 3B is a diagram illustrating a fixed schedule. Referring to FIG. 3, in the fixed schedule, an output upper limit value is predetermined in advance of a predetermined number of days (for example, 400 days). In FIG. 3B, as an example, it is assumed that the output upper limit value is determined for each day. The fixed schedule is stored in the storage unit 36 of the control device 30.

(A3. Charge control of storage battery 20 based on output restriction information)
Next, charging control of the storage battery 20 based on the output restriction information will be described. The photovoltaic power generation provided with the storage battery 20 of the present embodiment actively sells surplus power (power obtained by subtracting power consumption from generated power). First, control in the photovoltaic power generation system 1 of the present embodiment when the output is not limited will be described.

  The solar power generation system 1 of the present embodiment sells surplus power to a power company in the daytime when the generated power exceeds the power consumption. In the morning and evening when the power consumption exceeds the generated power due to the amount of solar radiation, the shortage of power is supplied from the storage battery 20.

  The photovoltaic power generation system 1 of the present embodiment has a predetermined target in a time zone (hereinafter, also referred to as “midnight zone”) in which a power purchase price (electricity rate) from a power company is lower than other time zones. The storage battery 20 is charged with electric power up to the charge amount. In the present embodiment, when the control device 30 determines that the output is not restricted on a certain day based on the fixed schedule, the control device 30 sets the target charge amount of the storage battery 20 at the end of the midnight zone to the maximum capacity. Generally, electricity rates are set low from late night to early morning and set high during the day. Therefore, in the present embodiment, charging of the storage battery 20 is performed at midnight. The midnight zone means, for example, from 23:00 to 7:00.

  As described above, the photovoltaic power generation system 1 of the present embodiment is controlled so that surplus power is sold and the storage battery 20 is charged in the middle of the night when the output is not limited.

  Next, control in the photovoltaic power generation system 1 of the present embodiment when the output is limited will be described.

  When the output is limited, the solar power generation system 1 of the present embodiment charges the storage battery 20 with surplus power that cannot be sold due to the output limitation. For example, surplus power is sold up to the upper limit of the output limit, and the remaining surplus power is charged in the storage battery 20. In a time zone in which power consumption exceeds power generation, insufficient power is supplied from the storage battery 20.

  In the present embodiment, in the midnight zone, the storage battery 20 is charged with power up to the target charge amount set according to the output upper limit value based on the fixed schedule. If the control device 30 determines that the output is to be limited during the day on a certain day based on the output restriction information (fixed schedule), the control device 30 sets the target charge amount of the storage battery 20 at the end of the late night zone to be smaller than the maximum capacity. . Control device 30 sets a target charge amount according to the output upper limit value so that storage battery 20 can be charged with surplus power that cannot be sold due to output limitation. For example, when the output upper limit value is small (the output limit is large), the surplus power amount charged in the storage battery 20 increases. Therefore, the target charge amount is made smaller than a predetermined target charge amount, and the available capacity of the storage battery 20 is reduced. Increase capacity.

  As described above, the photovoltaic power generation system 1 of the present embodiment performs charging of the storage battery 20 in the middle of the night when the output is restricted, and further charges the storage battery 20 with surplus power that cannot be sold due to the output restriction. Controlled.

  As described above, based on the output restriction information (fixed schedule) stored in the storage unit 36, the control device 30 determines whether the output of the power generation device is restricted during the daytime of a certain day, Control is performed to increase or decrease the charge amount of the storage battery in a predetermined time zone in which the charge is set lower than in other time zones before the daytime of a certain day. Thereby, control device 30 according to the present embodiment can use storage battery 20 efficiently and effectively use the generated power.

  FIG. 4 is a diagram illustrating a control flow of charging according to the present embodiment. Referring to FIG. 4, in step S102, control unit 34 determines whether or not the output of power generation system 1 on the next day is to be limited based on the output upper limit value of the fixed schedule. Specifically, when the output upper limit value of the fixed schedule is 100%, the control unit 34 determines that the output of the power generation system 1 on the next day is not limited. On the other hand, when the output upper limit value of the fixed schedule is not 100%, the control unit 34 determines that the output of the power generation system 1 on the next day is limited.

  If it is determined that the power generation system 1 on the next day is to be output-limited (YES in step S102), the control unit 34 advances the control of late-night charging to step S103, and the control is performed in advance based on the output upper limit value of the fixed schedule. The target charge amount is reduced from the target charge amount of the storage battery 20 at the end of the late night zone.

  On the other hand, when determining that the output of the power generation system 1 on the next day is not limited (NO in step S102), the control unit 34 advances the control of late-night charging to step S104, and the predetermined time at the end of the predetermined night of the storage battery 20 is determined. Maintain the target charge.

  According to the above, the control device 30 according to the present embodiment can efficiently use the storage battery 20 based on the output restriction information (fixed schedule).

  The charging of the storage battery 20 may be performed at least in a predetermined time zone in which the charge is set lower than in other time zones, and may be started before the end of the predetermined time zone. For example, the operation may be started from the end time of the late night zone to the time that is before the time when the charge amount of the storage battery 20 at the end of the late night zone can be sufficiently ensured. Further, the time zone for charging the storage battery 20 is not limited to the late night zone, but may be any time zone in which the charge is set lower than at least other time zones.

[B. Embodiment 2]
(B1. Outline)
In the first embodiment, the configuration in which the charging of the storage battery 20 is controlled based on the output restriction information (fixed schedule) has been described. However, the output upper limit value defined in the fixed schedule may be changed.

  Specifically, the power company temporarily sets the output upper limit value defined in the fixed schedule to be lower to maintain the power quality in the power system, but the fixed schedule is based on past statistical data and the like. . Therefore, the power company may change the output upper limit value defined in the fixed schedule depending on the weather or the like. Typically, the power company makes a change to increase the output upper limit set lower (to ease the output limitation).

  Therefore, the control device according to the present embodiment efficiently predicts whether or not the output limitation is relaxed, so that the storage battery 20 can be efficiently used even when the output upper limit value defined in the fixed schedule is changed. Utilize the generated power effectively. Hereinafter, the control will be described. The basic configuration of the control device according to the present embodiment is the same as the control device described in the first embodiment, and thus will not be described repeatedly.

(B2. Update schedule)
When changing the output upper limit value for a certain day defined by the fixed schedule, the power company distributes information on the changed output upper limit value to each customer, for example, the day before the certain day or early in the morning on the day. In this way, the information on the output upper limit value distributed after the distribution of the fixed schedule is defined as the update schedule.

  FIG. 5 is a diagram illustrating an update schedule. The output upper limit value of the fixed schedule is updated (changed) by the update schedule. For example, in the fixed schedule shown in FIG. 3B, the output upper limit value on August 27, 2015 is “40%”, but the output upper limit value is “40%” by the update schedule shown in FIG. Is updated to "80%".

  In the example shown in FIG. 5, the update schedule for one day is distributed, but the present invention is not limited to this. For example, the update schedule may be configured to update the output upper limit value for a plurality of days of the fixed schedule.

  Hereinafter, the output upper limit value according to the fixed schedule before being updated by the update schedule is referred to as “output upper limit value of the fixed schedule”, and the output upper limit value according to the update schedule after being updated by the update schedule is also referred to as “output upper limit value of the update schedule”. Name.

  Thus, the fixed schedule may be updated by the update schedule. In this case, on a certain day, the output upper limit value of the update schedule may be higher than the output upper limit value of the fixed schedule (hereinafter, also referred to as “the output limit is eased”).

(B3. Prediction of whether output restriction is relaxed)
The communication device 40 acquires information on the climatic element distributed by the Meteorological Agency or the like via the Internet 80, and outputs the information to the control device 30. The control device 30 predicts whether the output restriction is relaxed based on the information on the climatic factor. Hereinafter, as a typical example, description may be made with “a certain day” as the next day.

  FIG. 6 is a diagram illustrating prediction of whether or not the output upper limit of the next day's update schedule is higher than the output upper limit of the fixed schedule (whether or not the output restriction is relaxed).

  As an example of the prediction condition, the temperature and the amount of solar radiation can be considered. When the temperature is high, the power consumption by the cooling device increases. When the temperature is low, the amount of power consumed by the heating device increases. As described above, when the power demand increases, the power supply amount of the power company increases, so that the output upper limit value is expected to increase (output restriction is eased). When the amount of solar radiation is large, the amount of power generated by the customer increases. Therefore, it is predicted that the power company will maintain or lower the output upper limit value (the output limit will not be relaxed) in order to maintain the power quality in the power system.

  Hereinafter, “high temperature” means that the average daytime temperature of the next day acquired by the communication device 40 is higher than the normal daytime temperature of the day corresponding to the next day. "Low temperature" means that the average daytime temperature of the next day acquired by the communication device 40 is lower than the normal daytime temperature of the day corresponding to the next day. “Normal temperature” refers to the average of the daytime average temperatures during the past several decades on a daily basis. In the present embodiment, as an example, the average temperature is the average value of the daytime average temperatures during the past 30 years.

  Hereinafter, “a large amount of solar radiation” means that the amount of solar radiation during the day of the next day acquired by the communication device 40 is greater than the amount of normal solar radiation during the day corresponding to the next day. "Small insolation" means that the daytime insolation acquired by the communication device 40 during the day is less than or equal to the normal daytime insolation during the day corresponding to the next day. “Normal solar radiation” refers to the average value of daytime solar radiation during the past several decades per day. In the present embodiment, as an example, the normal solar radiation is an average value of the daytime solar radiation during the past 30 years.

  FIG. 6A is a diagram illustrating prediction of whether or not the output restriction is relaxed (whether or not the output upper limit value increases) in summer. “Summer” may be defined by a time period, for example, from July to September, or may be defined by a temperature, such as when the average temperature is 25 ° C. or higher.

  When the temperature is high, the power consumption of the cooling device increases, so that the power demand of the customer increases. Therefore, referring to FIG. 6A, regardless of the amount of solar radiation, control unit 34 predicts that the output upper limit value will increase (output restriction will be eased).

  When the temperature is low and the amount of solar radiation is large, the power demand of the customer decreases and the power generation amount of the customer increases. Therefore, referring to FIG. 6A, control unit 34 predicts that the output upper limit will not increase (output restriction will not be relaxed).

  If the amount of solar radiation is low, the amount of power generated by the customer will decrease. Therefore, referring to FIG. 6A, control unit 34 predicts that the output upper limit value will increase regardless of the temperature.

  FIG. 6B is a diagram illustrating prediction of whether or not the output restriction is relaxed in winter. “Winter” may be defined by time, for example, from December to February, or may be defined by temperature, such as when the average temperature is 10 ° C. or less.

  When the temperature is low, the power consumption of the heating device increases, so that the power demand of the customer increases. Therefore, referring to FIG. 6B, regardless of the amount of solar radiation, control unit 34 predicts that the output upper limit value will increase (output restriction will be eased).

  When the temperature is high and the amount of solar radiation is large, the power demand of the customer decreases and the power generation amount of the customer increases. Therefore, referring to FIG. 6B, control unit 34 predicts that the output upper limit will not be relaxed.

  If the amount of solar radiation is low, the amount of power generated by the customer will decrease. Therefore, referring to FIG. 6B, regardless of the temperature, control unit 34 predicts that the output upper limit value will increase (output restriction will be eased).

  FIG. 6C is a diagram illustrating prediction of whether or not the output restriction is relaxed in spring and autumn. “Spring” and “autumn” may be defined by time, for example, from March to June and from October to November, respectively, or when the average temperature is higher than 10 ° C. and lower than 25 ° C. The temperature may be defined as follows.

  When the amount of solar radiation is large, the amount of power generated by the customer increases. Therefore, referring to FIG. 6C, control unit 34 predicts that the output upper limit value will not increase (output restriction will not be relaxed).

  When the amount of solar radiation is small, the amount of power generated by the customer decreases. Therefore, referring to FIG. 6C, control unit 34 predicts that the output upper limit value will increase (output restriction will be eased).

  According to the above, the control unit 34 can predict whether or not the output upper limit increases or not based on the information on the season and the climatic factor. In other words, the control unit 34 predicts whether or not the output restriction on a certain day will be more relaxed than the output restriction based on a fixed schedule by acquiring climate information indicating a daytime climatic element on a certain day. be able to.

  Note that the normal temperature and the normal solar radiation are only examples, and the prediction conditions for determining whether or not the output upper limit increases are not limited to these. For example, in addition to temperature and insolation, a normal daytime value of a climatic element (climate element) that can be represented by numerical values such as precipitation, humidity, and atmospheric pressure may be used. It is assumed that the normal values of the daytime climatic factors for each day are stored in the storage unit 36. In another aspect, control device 30 obtains a result of comparing the normal value of the daytime climatic element for each day with the daytime climatic element of the date corresponding to the next day from an external server or the like via communication device 40. May be. In still another aspect, the normal value of the daytime climatic factor may be changed according to the installation location (area) of the power generation system 1.

  The control device 30 compares the result of comparing the daytime climatic element of the day corresponding to the next day or the normal value of the daytime climatic element for each day with the daytime climatic element of the day corresponding to the next day at midnight. It is acquired a predetermined time before the end of the band ends. In the present example, the predetermined time may be a time that can sufficiently secure the charge amount of the storage battery 20 at the end of the late night zone, and is, for example, four hours.

(B4. Charge control of storage battery 20 based on prediction of whether or not the output restriction is relaxed)
Next, charging control of the storage battery 20 in the late night zone will be described based on prediction of whether the output limitation is relaxed or not.

  The control device 30 acquires climate information indicating a daytime climatic element of a certain day before the end of the predetermined time zone in which the fee is set lower than other time zones, and stores the output limit information (fixed). Schedule) and the acquired climate information, the control for increasing or decreasing the charge amount in a predetermined time zone is changed. Hereinafter, the description will be made.

  When control device 30 determines that the output upper limit on a certain day is higher than the output upper limit based on the fixed schedule (the output limit is eased), storage battery 20 set according to the output upper limit based on the fixed schedule is used. The target charging amount is increased from the target charging amount at the end of the late night zone.

  Control device 30 sets the target charge amount to be smaller as the output upper limit value is smaller. The reason is that as the output upper limit value is smaller, the surplus power amount that cannot be sold during the restriction period increases, and it is necessary to secure the free space of the storage battery 20 for charging the surplus power amount. In such a case, the output restriction on a certain day is relaxed, and when the amount of power that can be sold increases, the amount of charge that is to be charged to the storage battery 20 during the restriction period decreases. If the charge amount of the storage battery 20 is small, for example, in the evening when the power consumption exceeds the generated power, the shortage of power cannot be sufficiently supplied from the storage battery 20, and the storage battery 20 cannot be used efficiently.

  Therefore, the control device 30 determines whether or not the output restriction is relaxed based on the daytime climatic factor of the next day. The target charge amount is increased from the target charge amount based on the output upper limit value. By doing so, in the evening when power consumption exceeds generated power, insufficient power can be sufficiently supplied from the storage battery 20, and the storage battery 20 can be used efficiently.

  As described above, when the control device 30 determines that the output limitation is further relaxed based on the acquired climate information, the control device 30 charges the battery more than the charge amount at the end of the predetermined time zone based on the stored output limitation information (fixed schedule). Control to increase the amount is performed. Further, the control device 30 performs the increase / decrease control of the charge amount according to the information (output upper limit value) related to the limit amount included in the output limit information.

  On the other hand, when determining that the output limitation is not relaxed (the output upper limit does not increase), control device 30 maintains the target charge amount of storage battery 20 at the end of the late night zone based on the output upper limit of the fixed schedule. In other words, when the control device 30 determines that the output restriction is not alleviated based on the acquired climate information, the control device 30 determines the charge amount at the end of the predetermined time period based on the stored output restriction information (fixed schedule). Control to maintain.

  As described above, the control device 30 determines whether the output of the power generation system 1 is limited during the day on a certain day based on the fixed schedule stored in the storage unit 36, and In addition to controlling the increase / decrease of the charge amount of the storage battery 20 in the preceding midnight zone, information on daytime climatic factors on a certain day before the end of the midnight zone is acquired, and the output upper limit value of the fixed schedule and the acquired climatic factors are obtained. By changing the control for increasing / decreasing the amount of charge in the late night zone according to this information, the storage battery 20 can be used efficiently, and control of the storage battery 20 suitable when output is limited can be achieved.

  FIG. 7 is a diagram illustrating a charge control flow according to the present embodiment. Note that the portions denoted by the same reference numerals as in FIG. 5 are the same, and the description of those portions will not be repeated.

  Referring to FIG. 7, if it is determined in step S102 that the output is to be limited, control unit 34 acquires climate information indicating a daytime climatic element from communication device 40 in step S105. In the present embodiment, the climate information includes the average temperature and the amount of solar radiation as climatic factors.

  In step S106, the control unit 34 predicts whether or not the output restriction is relaxed. Specifically, the control unit 34 compares the daytime insolation during the day with the next day recorded in the storage unit 36. Furthermore, when the day corresponding to the next day is summer and winter, the control unit 34 compares the average daytime temperature of the next day with the normal temperature of the day corresponding to the next day recorded in the storage unit. The control unit 34 relaxes the output restriction during the day on the following day according to the comparison result between the climate information indicating the daytime climatic element on the next day and the normal value of the climatic element on the day corresponding to the next day. Predict whether to be performed.

  If it is predicted that the output limit will be eased (YES in step S106), control unit 34 advances the control of late-night charging to step S108, and determines whether or not storage battery 20 at the end of late-night zone based on the output upper limit of the fixed schedule. Control is performed to increase the target charge amount beyond the target charge amount (the target charge amount set in step S103). In other words, when the control unit 34 predicts that the output is to be limited during the day of the next day and determines that the output is to be relaxed based on the climate information, the control unit 34 sets the target charging amount to be less than the target charge based on the output. Control for increasing the target charge amount is performed.

  On the other hand, when it is predicted that the output limitation will not be relaxed (NO in step S106), control unit 34 performs late-night charging while maintaining the target charging amount of storage battery 20 at the end of late night based on the output upper limit of the fixed schedule. Control is terminated. In other words, if the control unit 34 predicts that the output restriction will be performed during the day of the next day and determines that the output restriction will not be relaxed based on the climate information, the control unit 34 sets the target charging based on the output restriction. Control to maintain the amount is performed.

  According to the above, the control device 30 determines whether or not the output of the power generation system 1 is restricted during the day on the next day based on the output upper limit value of the fixed schedule, In addition to controlling the increase / decrease of the target charge amount of the storage battery 20, before the end of the midnight zone, the information of the daytime climatic element is acquired, and according to the output upper limit value of the fixed schedule and the acquired information of the climatic element. By changing the increase / decrease control of the target charge amount at midnight, the storage battery 20 can be used efficiently.

  Note that the acquisition of the climate information (step S104) and the prediction of whether or not the output restriction is relaxed (step S106) are also performed at least before the end of the predetermined time zone in which the fee is set lower than other time zones. You can go to For example, the charging may be performed by a time at which the charging of the storage battery 20 can be started from a time at which the charging of the storage battery 20 at the time of the end of the late night to the time at which the charge amount of the storage battery 20 at the end of the late night zone goes back.

[C. Third Embodiment]
(C1. Overview)
In the second embodiment, the target charge amount of the storage battery 20 at the end of the late night zone based on the output upper limit of the fixed schedule is controlled based on whether the output restriction is relaxed.

  In the present embodiment, in addition to the conditions of the second embodiment, the electricity price (hereinafter, also referred to as “expensive power purchase price”) of the power supplied from the power company at the time when the output of the power generation system 1 is limited and the power company The relationship with the price of electricity sold to is further considered.

  FIG. 8 is a diagram illustrating charging control of storage battery 20 according to the present embodiment. Referring to FIG. 8, when the output restriction is predicted to be relaxed and the power sale price is higher than the overpriced power purchase price, control device 30 determines based on the output upper limit value of the fixed schedule. The target charge amount is increased from the target charge amount of the storage battery 20 at the end of the late night zone. Thereby, for example, in the evening when the power consumption exceeds the generated power, the insufficient power can be sufficiently supplied from the storage battery 20, and the storage battery 20 can be used efficiently.

  If the output restriction is predicted to be relaxed, and the power selling price is equal to or less than the overpriced power purchase price, the control device 30 determines whether or not the storage battery 20 ends at midnight based on the output upper limit of the fixed schedule. To maintain the target charge. Thereby, the free space of the storage battery 20 for charging the surplus electric energy to the storage battery 20 is secured, and the storage battery 20 can be used efficiently.

  If it is predicted that the output limitation will not be relaxed, the control device 30 sets the target charging at the end of the midnight zone of the storage battery 20 based on the output upper limit of the fixed schedule regardless of the relationship between the power sale price and the over priced purchase price. Maintain quantity. The reason is that, under the conditions, it is expected that a part of the surplus electric power cannot be sold to the electric power company, so that it is necessary to secure the free space of the storage battery 20. Thereby, the power generation system 1 can use the storage battery 20 efficiently.

  According to the above, the control according to the present embodiment uses the storage battery 20 more efficiently than the control according to the first embodiment in order to further consider the relationship between the overpriced power purchase price and the power sale price to the power company. be able to.

(C2. Charging control of the storage battery 20 based on the relationship between the electricity rate and the selling price)
FIG. 9 is a diagram illustrating a control flow for charging storage battery 20 according to another embodiment. Note that the portions denoted by the same reference numerals as those in FIG. 7 are the same, and thus the portions will not be described repeatedly.

  In step S120, the control unit 34 checks whether or not the power sale price is higher than the overvalued power purchase price. When the power sale price is higher than the overvalued power purchase price (YES in step S120), control unit 34 advances the charge control to step S108. On the other hand, when the power sale price is equal to or less than the overpriced purchase price (NO in step S120), control unit 34 operates at midnight while maintaining the target charge amount of storage battery 20 at the end of the late night zone based on the output upper limit of the fixed schedule. The charging control of the band is ended.

  According to the above, in addition to the control conditions of the first embodiment, since the relationship between the overpriced power purchase price and the power sale price to the power company is further considered, the storage battery 20 can be used more efficiently.

  Note that the processing in the control device 30 in each of the above embodiments is realized by each hardware and software executed by the control unit 34. Such software may be stored in the storage unit 36 in advance. The software may be stored in another storage medium and distributed as a program product. Alternatively, the software may be provided as a downloadable program product by an information provider connected to the so-called Internet. Such software is read from the storage medium by a reading device (not shown) or downloaded via the communication IF 32 or the like, and then temporarily stored in the storage unit 36. The software is stored in the storage unit 36 by the control unit 34 in the form of an executable program. The control unit 34 executes the program. Each component constituting the control device 30 shown in FIG. 2 is a general component. Therefore, it can be said that an essential part of the present invention is software stored in a memory or a storage medium or software downloadable via a network.

  As described above, the invention made by the inventor has been specifically described based on the embodiment. However, it is needless to say that the inventor is not limited to the embodiment, and can be variously modified without departing from the gist of the invention. No.

  1 power generation system, 10 power conditioner, 20 storage battery, 30 control device, 40 communication device, 50 distribution board, 60 CT sensor, 70 solar cell module, 80 internet, 100 storage battery management system.

Claims (7)

A control device that performs charge / discharge control of a power generation device using natural energy and a storage battery that stores power supplied from a power system,
A storage unit that stores output restriction information that restricts reverse power flow to the power system of the power generation device,
And a control unit,
For the amount of use of the power supplied from the power system, at least a predetermined time zone that is set lower than other time zones is defined,
The control unit includes:
Based on the output restriction information, have rows decrease control of the charge amount of the predetermined time period battery before being outputted Restricted whether the determination to the day of day in the during the day one day,
Before the end of the predetermined time period, to obtain climatic information indicating a daytime climatic element of the certain day, change the increase / decrease control of the charge amount according to the output restriction information and the climatic information, Control device.   The control unit, based on the output restriction information, when the output is expected to be restricted during the day of the certain day, when it is determined that the output restriction is relaxed based on the acquired climate information, the output The control device according to claim 1, wherein the control device performs control to increase the charge amount from the charge amount based on the restriction information.   The control unit, based on the output restriction information, when it is expected that the output is restricted during the day of the certain day, when it is determined that the output restriction is not relaxed based on the climate information, The control device according to claim 1, wherein control is performed to maintain the charge amount based on output restriction information. The control unit is configured to change the increase / decrease control of the charge amount according to a result of comparing climate information indicating a daytime climatic element of the certain day with a normal value of a climatic element corresponding to the climatic element,
The control device according to any one of claims 1 to 3, wherein the climatic element includes at least one of a temperature and an amount of solar radiation. The output limit information includes information on a limit amount,
The control device according to any one of claims 1 to 4, wherein the control unit performs increase / decrease control of the charge amount in accordance with information on the limit amount. A storage battery management system that manages charging and discharging of storage batteries,
The storage battery management system,
A storage battery for storing power supplied from a power generator and a power system using natural energy,
A control device that performs charge / discharge control of the storage battery,
For the amount of use of the power supplied from the power system, at least a predetermined time zone that is set lower than other time zones is defined,
The control device includes:
Output limiting information for limiting reverse power flow to the power system of the power generation device is stored,
Based on the stored output restriction information, it is determined whether or not the output is restricted during the daytime of a certain day, and increase / decrease control of the charge amount of the storage battery in the predetermined time zone before the daytime of the certain day is performed. I
Before the end of the predetermined time period, to obtain climatic information indicating a daytime climatic element of the certain day, change the increase / decrease control of the charge amount according to the output restriction information and the climatic information, Battery management system. A control method for controlling charging of a storage battery that stores power supplied from a power generation device and a power company using natural energy,
For the amount of use of the power supplied from the power system, at least a predetermined time zone that is set lower than other time zones is defined,
Based on the output restriction information that restricts reverse power flow to the power system of the power generation device stored in the memory, it is determined whether or not the output is restricted during the day during a certain day, and before the day during the day. There line increased or decreased control of the charge amount of the predetermined time period storage battery,
Before the end of the predetermined time period, to obtain climatic information indicating a daytime climatic element of the certain day, change the increase / decrease control of the charge amount according to the output restriction information and the climatic information, Control method.

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