JP2009284586A - Power system and its control method - Google Patents

Power system and its control method Download PDF

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JP2009284586A
JP2009284586A JP2008131773A JP2008131773A JP2009284586A JP 2009284586 A JP2009284586 A JP 2009284586A JP 2008131773 A JP2008131773 A JP 2008131773A JP 2008131773 A JP2008131773 A JP 2008131773A JP 2009284586 A JP2009284586 A JP 2009284586A
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power
amount
discharger
charger
demand
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JP2008131773A
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JP5095495B2 (en
Inventor
Yasushi Irokawa
Yosuke Nozaki
Akifumi Somatani
Akira Takeuchi
聡文 杣谷
章 竹内
泰史 色川
洋介 野崎
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Nippon Telegr & Teleph Corp <Ntt>
日本電信電話株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/10Photovoltaic [PV]
    • Y02B10/14PV hubs

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power system which improves the efficiency of accumulating surplus power and cuts the peak of the power from a commercial power system. <P>SOLUTION: A solar cell 1 generates electricity, according to the quantity of irradiation light. A charger-discharger 4 performs charge and discharge to a storage battery 103, and also measures the charged electric energy charged in the storage battery 103. A predictor 11 predicts electric power generated in the solar cell 1 and demanded electric energy to be consumed in home electric appliances 102. A planning division 12 plans the charge and discharge by the charger-discharger 4, based on the electric power generation and the demanded electric energy that the predictor 11 has predicted and the charged electric energy that the charger-discharger 4 has measured. A controller 13 controls the charge and discharge by the charger-discharger 4, according to the plan that the planning division 12 has made. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric power system that accommodates electric power generated by a solar power generation system between a storage battery and an electric power load, and a control method thereof.

  In recent years, a domestic power system having a photovoltaic power generation system and a storage battery has been used. In such a home power system, the power generated by the solar power generation system is interchanged between a storage battery and a home power load such as a home appliance. At this time, the home power system stores the power generated by the solar power generation system in the storage battery when the power consumed by the home power load is small. Further, the home power system supplies the power stored in the storage battery to the home power load when the power consumed by the home power load is large. Thereby, the power supplied from the commercial power system is leveled.

As such an in-home power system, there is a simple solar power generation system for home described in Patent Document 1. In this home-use simplified solar power generation system, a storage battery mounted on an electric vehicle is used as the storage battery.
JP-A-8-19193

  The amount of power generated by the solar power generation system may exceed the amount of power consumed by the household power load during the daytime. In many cases, the surplus power surpassed is reversely flowed to the commercial power system and sold to the power company. However, this reverse power flow to the commercial power system reduces the power quality of the commercial power system. For this reason, when a household power system equipped with a photovoltaic power generation system is widely spread and the reverse power flow increases, there is a problem that the power quality of the commercial power system due to the reverse power flow is reduced to a negligible level. .

In the home-use simplified solar power generation system described in Patent Document 1, surplus power is stored in a storage battery mounted on an electric vehicle. However, since the capacity of the storage battery is limited, there is a problem that the free capacity of the storage battery is insufficient and excess power cannot be stored. In particular,
Since the storage battery mounted on the electric vehicle needs to secure an amount of power to be used as power for the electric vehicle, the capacity of the storage battery capable of storing surplus power is reduced.

  In addition, in this simple solar power generation system for home use, the stored power is supplied to the home power load when there is a large amount of power consumed by the home power load. The peak of the power supplied to is cut. However, when the amount of charging power of the storage battery is small, power supply from the storage battery to the home appliance is insufficient. Therefore, the supply of electric power from the commercial power system to the household power load increases, causing a problem that peak cutting of power from the commercial power system cannot be performed sufficiently.

  Accordingly, an object of the present invention is to provide an electric power system capable of improving efficiency for storing at least surplus electric power, and further capable of performing peak cut of electric power from a commercial electric power system, and a control method thereof. It is.

  The power system according to the present invention is a power system that can be connected to a power load, a power system, and a storage battery, and performs solar cell generation that generates power according to the amount of light that is irradiated, charging and discharging the storage battery, and A charger / discharger that measures the amount of charging power charged in the storage battery; and when the charger / discharger discharges, the discharged power, the power from the power system, and the solar cell The generated power is supplied to the power load, and when the charger / discharger is charged, the power from the power system and the power generated by the solar cell are combined with the power load. And a distribution board to be supplied to the charger / discharger, a power generation amount generated by the solar cell, a prediction unit that predicts a demand power amount consumed by the power load, a power generation amount predicted by the prediction unit, and Demand power and charge / discharge And a control unit for controlling charging / discharging by the charger / discharger according to a plan established by the planning unit, based on the charging energy measured by the charging / discharging unit, Including.

  The control method of the power system according to the present invention includes a solar cell that generates power according to the amount of irradiated light, a charger / discharger that charges / discharges a storage battery, and when the charger / discharger discharges, When the discharged power, the power from the power system and the power generated by the solar battery are supplied to the power load, and when the charger / discharger is charged, the power from the power system and the power A distribution system for supplying power generated by a solar battery to the power load and a charger / discharger, and a method for controlling an electric power system that measures the amount of charging power charged in the storage battery A step of predicting a power generation amount generated by the solar battery and a demand power amount consumed by the power load; the predicted power generation amount and demand power amount; and the measured charging power Based on quantity and A planning step plan for charging and discharging by the charging and discharging device, according to the erected plan, and a control step of controlling the charging and discharging by the charging and discharging unit.

  According to the present invention, it is possible to improve efficiency for storing at least surplus power, and it is possible to perform peak cut of power from a commercial power system.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a power system according to an embodiment of the present invention. In FIG. 1, the power system includes a solar power generation system including a solar cell 1 and a converter 2, a distribution board 3, a charger / discharger 4, and a control terminal 5. The power system can be connected to the commercial system 101, the home appliance 102, and the storage battery 103. Further, the power system can be connected to the server 104 via the Internet 105.

  Note that the power system and the home appliance 102 are arranged in a house 106, and the storage battery 103 is mounted on an electric vehicle 107.

  The solar cell 1 generates electric power according to the amount of light irradiated (hereinafter referred to as the amount of solar radiation), and outputs the electric power to the converter 2. Note that the electric power generated by the solar cell 1 is direct-current power.

  The converter 2 is, for example, a power conditioner. Converter 2 converts the DC power from solar cell 1 to AC power and outputs the AC power to distribution board 3. The converter 2 measures the converted AC power amount as the power generation amount generated by the solar cell 1. Here, the converter 2 measures the power generation amount generated in the predetermined time zone for each time zone.

  The distribution board 3 can be connected to the commercial system 101, which is a commercial power system. When the charger / discharger 4 is discharged, the distribution board 3 supplies the discharged electric power, the electric power from the commercial system 101, and the electric power generated by the solar battery 1 to the home appliance 102. Further, when the charger / discharger 4 is charged, the distribution board 3 supplies the electric power from the commercial system 101 and the electric power generated by the solar cell 1 to the home appliance 102 and the charger / discharger 4. Furthermore, when the amount of discharge power discharged by the charger / discharger 4 is larger than the current power consumption consumed by the home appliance 102, the distribution board 3 determines the difference between the discharge power amount and the current power consumption amount. A reverse power flow to the commercial system 101 with a corresponding amount of electric power is performed.

  In addition, the distribution board 3 measures the amount of power consumed by the home appliance 102, the reverse power flow to the commercial system 101, and the amount of purchased power supplied from the commercial system 101. Here, the distribution board 3 measures the amount of power consumed in each time zone described above. Moreover, the distribution board 3 always measures reverse power flow. The distribution board 3 may measure the amount of power generation instead of the converter 2.

  The home appliance 102 is an example of a power load. Further, the home appliance 102 may be one or plural, but in FIG.

  The charger / discharger 4 can be connected to the storage battery 103 and constitutes a charge / discharge system that charges and discharges the storage battery 103. Further, the charger / discharger 4 always measures the amount of charging power charged in the storage battery 103. The storage battery 103 also functions as a power source for the electric vehicle 107.

  The control terminal 5 can be connected to the server 104 via the Internet 105. The server 104 provides, as a weather information service, actual weather information indicating actually observed weather for each of the above time zones, and for each of the above time zones within a predetermined period (for example, a period from the next day to one week later). And weather forecast information indicating the forecast of the weather. Here, the actual weather information includes weather information indicating weather (for example, sunny, cloudy, rainy, etc.) and temperature information indicating temperature. The weather forecast information includes weather forecast information indicating the prediction of the weather and temperature forecast information indicating the prediction of the temperature.

  The control terminal 5 includes a prediction unit 11, a planning unit 12, and a control unit 13.

  The prediction unit 11 receives actual weather information and weather forecast information from the server 104 periodically (for example, every day), and accumulates the actual weather information and weather forecast information.

  Further, the prediction unit 11 accumulates the power generation amount for each time zone measured by the converter 2 in association with the time zone. Further, the prediction unit 11 accumulates the power consumption for each time zone measured by the distribution board 3 in association with the time zone.

  Based on the accumulated actual weather information, weather forecast information, power generation amount, and power consumption amount, the prediction unit 11 predicts the power generation amount generated by the solar cell 1 within a predetermined prediction period for each time period. Further, the prediction unit 11 predicts the power consumption amount consumed by the home appliance 102 within the prediction period for each time zone based on the accumulated actual weather information, weather forecast information, power generation amount, and power consumption amount.

  Hereinafter, the predicted power generation amount by time zone is referred to as power generation prediction, and the predicted power consumption amount by time zone is referred to as demand prediction. The demand prediction is an example of the amount of power demand.

  Hereinafter, a specific generation method of power generation prediction by the prediction unit 11 will be described.

  First, when the actual weather information for each predetermined time period (for example, 30 days), the power generation amount, and the demand power amount are accumulated, the prediction unit 11 stores the weather information for each time period for that period. And the amount of power generation is extracted as a sample. The prediction unit 11 performs regression analysis on these samples, and derives a power generation prediction formula for predicting the power generation amount from the weather information for each time zone. In this regression analysis, the explanatory variable (independent variable) is weather information, and the objective variable (dependent variable) is the amount of power generation.

  For example, the prediction unit 11 quantifies the weather information by setting sunny as 1, cloudy as 2, rain as 3, and so on. Then, for each time zone, the prediction unit 11 sets the numerical weather information in that time zone as the explanatory variable X, and sets the power generation amount in that time zone as the objective variable Y. The constant term α of the regression equation Y = α + βX and the regression The coefficient β is obtained from the least square method, and the power generation prediction formula is derived for each time zone. Note that the method for deriving the power generation prediction formula by regression analysis is not limited to this method, and can be changed as appropriate.

  Subsequently, the prediction unit 11 inputs the weather forecast information of the time zone into the power generation prediction formula of the time zone for each time zone, and generates a power generation prediction for each time zone. Here, the prediction unit 11 uses the weather forecast information after quantifying the weather information by the same method as the method of quantifying the weather information when deriving the power generation prediction formula.

  Next, a specific method for generating demand prediction will be described.

  First, the prediction unit 11 extracts weather information, temperature information, and demand power amount for each predetermined time period as samples from the accumulated data. The prediction unit 11 performs regression analysis on these samples, and derives a demand prediction formula for predicting the demand power amount from the weather information and the temperature information for each time zone. In this regression analysis, the explanatory variables are weather and temperature, and the objective variable is the amount of power demand.

For example, the prediction unit 11 quantifies the weather by setting sunny as 1, cloudy as 2, rain as 3, and so on. Then, for each time zone, the prediction unit 11 uses a regression equation Z in which the weather in that time zone is the explanatory variable X 1 , the temperature in that time zone is the explanatory variable X 2 , and the power demand in that time zone is the objective variable Z. A constant term γ and regression coefficients δ and ε of = γ + δX 1 + εX 2 are obtained from the least square method, and a demand prediction formula is derived for each time zone. Note that the method for deriving the demand prediction formula by regression analysis is not limited to this method, and can be changed as appropriate.

  Subsequently, the prediction unit 11 inputs the weather forecast information and the temperature forecast information for the time zone into the demand forecast formula for the time zone for each time zone, and generates a demand forecast for each time zone. Here, the prediction unit 11 uses the weather forecast information after quantifying it in the same way as the method of quantifying the weather information when deriving the demand prediction formula.

  The planning unit 12 makes a plan for charging / discharging by the charger / discharger 4 within the prediction period based on the power generation prediction and the demand prediction generated by the prediction unit 11. The prediction period may be, for example, from 1 o'clock to 24 o'clock on the next day, or may be from midnight on the same day (for example, 22:00) to midnight on the next day (for example, until 22:00). Moreover, it is desirable for the planning unit 12 to make a plan within the prediction period immediately before the prediction period.

  The control unit 13 controls charging / discharging by the charger / discharger 4 according to the charging / discharging plan established by the planning unit 12.

  Hereinafter, specific processing performed by the planning unit 12 and the control unit 13 will be described.

  The planning unit 12 is one of a first plan for improving the efficiency of storing surplus power and reducing the maximum value of the reverse power flow, and a second plan for performing peak cut of power from the commercial system 101. Stand up. Note that the peak cut is to make the power from the commercial system 101 less than or equal to the purchased power regulation value.

  First, the first plan will be described.

  (1) The planning unit 12 calculates the difference between the power generation prediction and the demand prediction generated by the prediction unit 11 for each time zone within the prediction period. When the power generation prediction is greater than the demand prediction, the planning unit 12 generates the difference as surplus power.

  (2) The planning unit 12 integrates the surplus power in each time zone, and calculates the total amount of surplus power within the prediction period. Thereby, the planning unit 12 calculates the total amount of the difference between the power generation prediction and the demand prediction for each time zone in which the power generation prediction is higher than the demand prediction as the total amount of surplus power.

  (3) The planning unit 12 calculates the difference between the charging power measured by the charger / discharger 4 and the rated capacity of the storage battery 103 as the free capacity of the storage battery. It is assumed that the rated capacity is preset in the planning unit 12.

  (4) The planning unit 12 compares the total amount of surplus power with the free capacity of the storage battery.

  The planning unit 12 classifies the charging / discharging plans into the following three types (A), (B1), and (B2) based on the comparison result between the total amount of surplus power and the free capacity of the storage battery, and the classification is performed. Make a first plan for charging and discharging.

(A) When the free space is equal to or greater than the total amount of surplus power:
The plan part 12 makes the plan which charges a storage battery with surplus electric power, and does not perform other charging / discharging. In this case, the control unit 13 causes the charger / discharger 4 to charge the storage battery 103 with surplus power so that the reverse flow rate measured by the distribution board 3 becomes zero.

(B) When the free space is smaller than the total amount of surplus power:
The planning unit 12 determines whether or not the differential power amount corresponding to the difference between the free capacity and the total amount of surplus power is greater than the total amount of demand prediction before the time zone when surplus power is generated for the first time. The time zone in which surplus power is generated for the first time is a surplus time zone in which the power generation prediction is greater than the demand prediction.

(B1) When the difference power amount is equal to or less than the total amount of demand forecast before the surplus time zone:
The planning unit 12 determines that a free capacity capable of charging all the surplus power can be secured by discharging the power charged in the storage battery 103 to the home appliance 102 before the surplus time period.

  And the plan part 12 makes the plan which makes the charger / discharger 4 discharge before the surplus time slot | zone so that the reverse power flow to the commercial grid | system 101 may not be performed. Further, the planning unit 12 makes a plan for reducing the amount of purchased power from the commercial system 101 to zero and discharging the charger / discharger 4 from the storage battery 103 to the home appliance 102. Here, the planning unit 12 determines the total amount of power to be discharged to the charger / discharger 4 (hereinafter referred to as the total discharge amount) to an amount equal to the difference power amount.

  In this case, the controller 13 causes the charger / discharger 4 to discharge so that the reverse flow rate measured by the distribution board 3 is always zero until the determined total discharge amount is discharged. When the control unit 13 discharges the total discharge amount, the surplus power is stored in the battery charger / discharger 4 so that the reverse power flow measured by the distribution board 3 becomes zero, as in (A). 103 is charged.

(B2) When the difference power amount is larger than the total amount of demand forecast before the surplus time zone:
The planning unit 12 determines that even if the power charged in the storage battery 103 is discharged to the home appliance 102 before the surplus time period, it is not possible to secure a free capacity capable of charging all the surplus power.

  And the plan part 12 makes the plan to make the charger / discharger 4 discharge so that the discharge from the storage battery 103 to the home appliance 102 is performed before the surplus time zone and the reverse power flow to the commercial system 101 is performed. Furthermore, the planning unit 12 makes a plan so that the reverse flow rate per predetermined time is constant and not more than a predetermined value. Here, the planning unit 12 determines the total discharge amount to be equal to the difference power amount. In addition, the planning unit 12 determines the total amount of reverse power flow as the amount of power corresponding to the difference between the difference power amount and the total amount of demand power before the surplus time zone.

  In this case, the control unit 13 charges / discharges the determined total discharge amount so that the discharge from the storage battery 103 to the home appliance 102 is performed before the surplus time period and the reverse power flow to the commercial system 101 is performed. 4 to discharge. At this time, the control unit 13 controls the reverse power flow so that the reverse power flow measured by the distribution board 3 is constant and not more than a predetermined value.

  When the control unit 13 discharges the total discharge amount, the surplus power is stored in the battery charger / discharger 4 so that the reverse power flow measured by the distribution board 3 becomes zero, as in (A). 103 is charged.

  Next, the second plan will be described.

  (1) The planning unit 12 calculates the difference between the demand prediction generated by the prediction unit 11 and the purchased power regulation value for each time zone. When the demand forecast is greater than the purchased power regulation value, the planning unit 12 sets the difference as peak power.

  (2) The planning unit 12 integrates the peak power in each time zone and calculates the total amount of peak power. Thereby, the total amount of the difference between the demand power amount and the purchase power prescribed value for each time zone in which the demand power amount is greater than the purchased power prescribed value is calculated as the total amount of peak power.

  (3) The planning unit 12 compares the latest charge power amount measured by the charger / discharger 4 with the total peak power amount.

  The planning unit 12 classifies the charging / discharging plans into the following two types (α) and (β) based on the comparison result between the charging power amount and the total peak power, and charging / discharging according to the classification. Make a second plan of discharge.

(Α) When the total peak power is smaller than the charge power:
The planning unit 12 makes a plan not to charge the power from the commercial grid 101 before the time period when the peak power is generated. In this case, the control unit 13 causes the charger / discharger 4 to store the storage battery 103 so that the purchased power amount measured by the distribution board 3 does not exceed the purchased power specified value in the time zone when the peak power is generated. To discharge.

(Β) When the total peak power is larger than the charge power:
The plan part 12 makes the plan which makes the charger / discharger 4 charge the storage battery 103 with the power from the commercial system 101 before the time period when the peak power is generated. Here, the planning unit 12 causes the charger / discharger 4 to charge so that the amount of charging power becomes equal to the total amount of peak power.

  Next, the operation will be described.

  First, in the case where the storage battery is nearly fully charged on a sunny day, the operation for reducing the maximum reverse power flow will be described. FIG. 2 is an explanatory diagram for explaining this operation example.

  In Fig.2 (a), the electric power demand 201 is shown by the bar graph, and the electric power generation amount 202 is shown by the line graph. The power demand 201 indicates the amount of power consumed by the home appliance 102. The power generation amount 202 indicates the power generation amount generated by the solar cell 1.

  In the electric power demand 201, the demand is large in the morning time zone and the time zone from evening to midnight, which are the time zones in which people are active in the house 106. Further, since the power generation amount 202 increases in proportion to the amount of solar radiation, it usually draws a mountain-shaped curve centering on daytime. Since the weather shown in FIG. 2 is sunny, the power generation amount 202 is greater than the power demand 201 in the time zone from 11:00 to 16:00. The amount of power generation that is greater than the power demand 201 is the surplus power shown in FIG.

  The surplus power is charged in the storage battery 103 or is reversely flowed to the commercial system 101. This reverse power flow reduces the power quality of the commercial system 101. For this reason, it is desirable that the reverse flow rate is small or not at all. That is, it is desirable that the surplus power is charged in the storage battery 103 as much as possible.

  In the prior art, if there is surplus power in the storage battery, the surplus power is charged, while if the power demand exceeds a specified value, the charged power is discharged. For this reason, as shown in FIG.2 (c), the charge of surplus electric power had to be started from the state in which the storage battery 103 is near full charge. In the state of the storage battery 103 shown in FIG. 2 (c), only the power for the first hour can be charged from the surplus power. Therefore, the surplus power thereafter is reversed. As a result, the power quality of the commercial system 101 has been reduced. Here, FIG. 2D shows the amount of the reverse power flow.

  In the present embodiment, first, the prediction unit 11 predicts the power demand 201 and the power generation amount 202 based on the accumulated actual weather information, the power generation amount, and the power demand amount, Generate power generation predictions.

  The planning unit 12 calculates the difference between the power generation prediction and the demand prediction for each time zone within the prediction period. When the power generation prediction is greater than the demand prediction, the planning unit 12 generates the difference as surplus power (FIG. 2B). The planning unit 12 integrates the surplus power in each time zone and calculates the total amount of surplus power in the prediction period. Then, the planning unit 12 calculates the difference between the charging power measured by the charger / discharger 4 and the rated capacity of the storage battery 103 to obtain the free capacity of the storage battery 103.

  Subsequently, the planning unit 12 compares the total amount of surplus power with the free capacity of the storage battery, and determines whether the free capacity is equal to or greater than the total amount of surplus power.

  When the free capacity is smaller than the total amount of surplus power, the planning unit 12 makes a plan to charge surplus power to the storage battery and not perform other charge / discharge. In this case, the control unit 13 causes the charger / discharger 4 to charge the storage battery 103 with surplus power so that the reverse flow rate measured by the distribution board 3 becomes zero.

  On the other hand, if the free capacity is smaller than the total amount of surplus power, the planning unit 12 determines whether the difference power amount corresponding to the difference between the free capacity and the total amount of surplus power is greater than the total amount of demand forecast before the surplus time zone. Judge whether or not.

  When the difference power amount is equal to or less than the total amount of demand forecast before the surplus time zone, the planning unit 12 causes the charger / discharger 4 to discharge so that the reverse power flow to the commercial system 101 is not performed before the surplus time zone. Stand up. Further, the planning unit 12 makes a plan for reducing the amount of purchased power from the commercial system 101 to zero and discharging the charger / discharger 4 from the storage battery 103 to the home appliance 102. Here, the planning unit 12 determines the total discharge amount to be discharged by the charger / discharger 4 to an amount equal to the difference power amount.

  In this case, the controller 13 causes the charger / discharger 4 to discharge so that the reverse flow rate measured by the distribution board 3 becomes zero until the determined total discharge amount is discharged.

  Thus, if the prediction period is set so that the discharge is performed from the previous day, as shown in FIG. 2 (e), the charge electric energy at 1 o'clock by the discharge of the previous day is shown in FIG. 2 (c). The amount of charging power can be made smaller. In FIG. 2 (e), the storage battery 103 is further discharged from 1 o'clock to 8 o'clock to further ensure free space. Therefore, since all the surplus power can be charged in the storage battery 103 (from 11:00 to 16:00 in FIG. 2 (e)), it becomes possible to prevent reverse power flow.

  On the other hand, when the difference power amount is equal to or less than the total amount of demand forecast before the surplus time zone, the planning unit 12 discharges the storage battery 103 to the home appliance 102 before the surplus time zone, and the reverse power flow to the commercial system 101 A plan is made to cause the charger / discharger 4 to discharge. Furthermore, the planning unit 12 makes a plan so that the reverse flow rate per predetermined time is constant and not more than a predetermined value. Here, the planning unit 12 determines the total discharge amount to be equal to the difference power amount. In addition, the planning unit 12 determines the total amount of reverse power flow as the amount of power corresponding to the difference between the difference power amount and the total amount of demand power before the surplus time zone.

  In this case, the control unit 13 charges / discharges the determined total discharge amount so that the discharge from the storage battery 103 to the home appliance 102 is performed before the surplus time period and the reverse power flow to the commercial system 101 is performed. 4 to discharge. At this time, the control unit 13 controls the reverse power flow so that the reverse power flow measured by the distribution board 3 is constant and not more than a predetermined value.

  FIG. 2 (f) is a diagram showing the reverse flow rate at this time. In FIG. 2 (f), the reverse tide flow rate can make the peak value of the reverse tide flow rate smaller than in the case of the prior art (FIG. 2 (d)). Therefore, it is possible to reduce the quality deterioration of the commercial system 101.

  Next, in a case where the storage battery is nearly empty on a cloudy or rainy day, an operation for reducing the purchased power amount by performing peak cut to reduce the power from the commercial system 101 to a specified purchased power value or less will be described. FIG. 3 is an explanatory diagram for explaining this operation example.

  In Fig.3 (a), the electric power demand 301 is shown by the bar graph, and the electric power generation amount 302 is shown by the line graph. The power demand 301 indicates the amount of power consumed by the home appliance 102. The power generation amount 302 indicates the power generation amount generated by the solar cell 1.

  On cloudy or rainy days, the amount of solar radiation is small, so the power generation amount 302 of the solar cell is small. In FIG. 3A, the power generation amount 302 is smaller than the power demand 301.

  In the prior art, only the surplus power amount of the power generation amount is charged, and thus the storage battery 103 is not charged in the situation shown in FIG. In addition, in the time zone from 18:00 to 22:00 when the power consumption exceeds the purchased power regulation value, the storage battery 103 is discharged and the discharged power is supplied to the home appliance 102 in order to perform peak cut. At this time, when the charge power amount of the storage battery 103 is smaller than the power amount necessary for the peak cut (FIG. 3B), the time during which the peak cut can be performed with the charge power amount is only the first two hours. It is. For this reason, there is no power storage amount for performing the peak cut of the remaining time (FIG.2 (c)). Therefore, in order to operate the home appliance 102, power larger than the purchased power regulation value is purchased from the commercial system 101 (FIG. 3 (d)), and the power cost increases.

  In the present embodiment, the planning unit 12 first calculates the difference between the demand prediction generated by the prediction unit 11 and the purchased power regulation value for each time zone. When the demand forecast is greater than the purchased power regulation value, the planning unit 12 sets the difference as peak power. The planning unit 12 integrates the peak power in each time zone to calculate the total amount of peak power. The planning unit 12 determines whether or not the latest charge power amount measured by the charger / discharger 4 is larger than the free capacity.

  In the case where the total amount of peak power is larger than the amount of charged power (FIG. 3A), the planning unit 12 sets the amount of power necessary for peak cut before the time zone when peak power occurs (FIG. 3E). Therefore, a plan is made to charge the battery 103 to the charger / discharger 4 with the electric power from the commercial system 101. As a result, during the time period during which peak cut is performed, the amount of power necessary for performing peak cut can be supplied from the storage battery 103 to the home appliance 102 (FIG. 2 (f)), and the amount of power purchased from the commercial grid 101. Can be kept below the specified power purchase value (FIG. 2 (g)).

  Next, setting of the purchased power prescribed value will be described.

  The planning unit 12 obtains a purchase power prescribed value for the prediction period so that the total amount of peak power within the prediction period is equal to or less than the capacity of the storage battery, and sets the obtained purchase power prescribed value. This is to prevent the plan for charging and the plan for discharging from being made simultaneously.

  The reason will be described below.

  There is a possibility that the plan to charge and the plan to discharge are made at the same time because the surplus power is charged in the storage battery 103 and the storage battery 103 is fully charged, and therefore the storage battery 103 is required to perform peak cut. Since the amount of electric power to be discharged is excessive, the charging electric energy of the storage battery 103 is insufficient. FIG. 4 is an explanatory diagram showing this situation.

  Even if the second plan is made for this situation and the maximum amount of power that can be charged in the storage battery 103 is stored in the storage battery 103, the amount of power necessary to perform the peak cut cannot be covered.

  Therefore, it is necessary to set the purchased power prescribed value to an appropriate value. Specifically, when the peak cut is performed from the fully charged state of the storage battery 103, the purchased power regulation value is set so that the total peak power is equal to or less than the capacity of the storage battery so that the charged power amount of the storage battery is not insufficient. It is necessary to be set to.

  In this case, the plan to charge and the plan to discharge are not made at the same time, the charge state of the first storage battery of the day is either excessive or insufficient, and the control to be performed is either discharge or charge Become.

  Next, the effect will be described.

  The solar cell 1 generates electric power according to the amount of light irradiated. The charger / discharger 4 charges and discharges the storage battery 103 and measures the amount of charging power charged in the storage battery 103. The prediction unit 11 predicts the amount of power generated by the solar cell 1 and the amount of power demand consumed by the home appliance 102. The planning unit 12 makes a plan for charging / discharging by the charger / discharger 4 based on the power generation amount and demand power amount predicted by the prediction unit 11 and the charging power amount measured by the charger / discharger 4. The control unit 13 controls charging / discharging by the charger / discharger 4 according to the plan established by the planning unit 12.

  In this case, charging / discharging with respect to the storage battery 103 by the charger / discharger 4 is controlled based on the predicted power generation amount and demand power amount and the measured charging power amount.

  Therefore, when it is predicted that the power generation amount is large, it is possible to discharge the storage battery 103 and increase the free capacity of the storage battery 103 before the power generation amount increases. Therefore, it is possible to secure a capacity for storing surplus power, and it is possible to improve efficiency for storing surplus power. Further, when it is predicted that the power generation amount is small, it is possible to charge the storage battery 103 and store a large amount of power before the demand power amount increases. Therefore, if the stored electric power is discharged when the demand power is large, it is possible to perform peak cut from the commercial system 101.

  In the present embodiment, the prediction unit 11 predicts the power generation amount and the demand power amount for each time zone. The planning unit 12 calculates the total amount of difference between the power generation amount and the demand power amount for each time zone in which the power generation amount is larger than the demand power amount as the surplus power total amount. In addition, the planning unit 12 calculates the difference between the charged power amount of the storage battery 103 and the rated capacity of the storage battery 103 as the free capacity of the storage battery 103. Then, when the free capacity is smaller than the surplus power total amount, the planning unit 12 discharges the difference power amount corresponding to the difference between the free capacity and the surplus power total amount before the surplus time period when the power generation amount is larger than the demand power amount. Make a plan to cause the electric appliance 4 to discharge.

  In this case, when the free capacity is smaller than the surplus power total amount, the difference power amount corresponding to the difference between the free capacity and the surplus power total amount is discharged from the charger / discharger 4 before the surplus time period when the power generation amount is larger than the demand power amount. Is done. Therefore, it becomes possible to secure a capacity for storing surplus power accurately, and it is possible to improve the efficiency of storing surplus power.

  Moreover, in this embodiment, when the free space is smaller than the surplus power total amount, the planning unit 12 prevents the reverse power flow from being performed if the difference power amount is equal to or less than the total amount of demand power before the surplus time zone. A plan is made to cause the charger / discharger 4 to discharge the difference power amount. On the other hand, when the difference power amount is larger than the total amount of demand power before the surplus time zone, the planning unit 12 only has a power amount corresponding to the difference between the difference power amount and the total amount of demand power before the surplus time zone. A plan is made to cause the charger / discharger 4 to discharge the differential electric energy so that the reverse power flow is performed.

  In this case, when all of the difference power amount can be consumed by the home appliance 102, the reverse power flow is not performed. In addition, when it is not possible to consume all of the difference power amount at the home appliance 102, it is possible to reversely flow only the power that cannot be consumed by the home appliance 102 out of the difference power amount. Therefore, it becomes possible to reduce a reverse tidal flow, and to suppress quality deterioration of the commercial system 101.

  Moreover, in this embodiment, the plan part 12 calculates the total amount of the difference of the demand power amount for every time zone when the demand power amount is larger than the purchased power specified value and the purchased power specified value as the total amount of peak power. And when the total amount of peak electric power is larger than charging electric energy, the plan part 12 is the charger / discharger 4 so that charging electric power may become equal to the total amount of peak electric power before the time when demand electric energy exceeds a regulation value. To discharge.

  In this case, it is possible to secure a capacity for storing surplus power, and it is possible to improve efficiency for storing surplus power.

  In each embodiment described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration.

  For example, although explained using household appliances as electric power load, electric power load can be suitably changed not only in household appliances.

It is the block diagram which showed the electric power system of one Embodiment of this invention. It is explanatory drawing for demonstrating the operation example at the time of making the maximum value of a reverse power flow small. It is explanatory drawing for demonstrating the operation example at the time of performing the peak cut of the electric power from a commercial system | strain. It is explanatory drawing which showed the condition where the electric energy required in order to perform peak cut is excessive, and the charging electric energy of a storage battery is insufficient even after a storage battery becomes a full charge.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solar cell 2 Converter 3 Distribution board 4 Charger / discharger 5 Control terminal 11 Prediction part 12 Planning part 13 Control part 101 Commercial system 102 Home appliance 103 Storage battery 104 Server

Claims (8)

  1. A power system connectable to a power load, a power system and a storage battery,
    A solar cell that generates electric power according to the amount of light irradiated;
    A charger / discharger that charges and discharges the storage battery and measures the amount of charge power charged in the storage battery;
    When the charger / discharger discharges, the discharged electric power, the electric power from the electric power system, and the electric power generated by the solar cell are supplied to the electric power load, and the charging / discharging is performed. When the electric appliance is charged, the distribution board for supplying the electric power from the electric power system and the electric power generated by the solar cell to the electric power load and the charger / discharger,
    A prediction unit that predicts the amount of power generated by the solar cell and the amount of power demand consumed by the power load;
    Based on the power generation amount and demand power amount predicted by the prediction unit, and the charging power amount measured by the charger / discharger, a planning unit that plans charging / discharging by the charger / discharger,
    And a control unit that controls charging / discharging by the charger / discharger according to a plan established by the planning unit.
  2. The power system according to claim 1,
    The prediction unit predicts the power generation amount and the demand power amount according to time zones,
    The planning unit calculates, as a surplus power total amount, a total amount of difference between the power generation amount and the demand power amount for each time zone in which the power generation amount is larger than the demand power amount, and the charging power amount and the storage battery Difference from the rated capacity of the storage battery is calculated as the free capacity of the storage battery, and when the free capacity is smaller than the total surplus power, the free capacity and the free capacity before the surplus time period when the power generation amount is greater than the demand power amount. The electric power system which makes the plan which makes the said charger / discharger discharge the difference electric energy equivalent to the difference with the said surplus electric power total amount.
  3. The power system according to claim 2,
    The distribution board has a difference between the discharge power amount and the current power consumption amount when the discharge power amount discharged by the charger / discharger is larger than the current power consumption amount consumed by the power load. Reverse power flow to the power system with the amount of power equivalent to
    The planning unit, when the free capacity is smaller than the surplus power total amount, if the difference power amount is less than or equal to the total amount of demand power before the surplus time zone, the reverse power flow is not performed, If a plan is made to discharge the difference power amount to the charger / discharger, and the difference power amount is larger than the total amount of the demand power amount before the surplus time zone, the difference power amount and the demand power before the surplus time zone The electric power system which makes the plan which discharges the said difference electric energy to the said charger / discharger so that the said reverse power flow may be performed only for the electric energy corresponding to the difference with the total amount of quantity.
  4. In the electric power system according to claim 2 or 3,
    The planning unit calculates, as a peak power total amount, a total amount of difference between the demand power amount and the specified value for each time zone in which the demand power amount is greater than a preset specified value, and the peak power total amount is If it is greater than the charge power amount, a plan is made to charge the charger / discharger so that the charge power amount becomes equal to the total peak power amount before the time when the demand power amount is greater than the specified value. Power system.
  5. A solar cell that generates power according to the amount of light irradiated, a charger / discharger that charges and discharges the storage battery, and when the charger / discharger discharges, the discharged power and power from the power system And the power generated by the solar cell is supplied to a power load, and when the charger / discharger is charged, the power from the power system and the power generated by the solar cell are A power distribution board that supplies power load and a charger / discharger;
    A measurement step of measuring the amount of charging power charged in the storage battery;
    A prediction step of predicting the amount of power generated by the solar cell and the amount of power demand consumed by the power load;
    A planning step of making a plan for charging / discharging by the charger / discharger based on the predicted power generation amount and power demand amount and the measured charging power amount;
    And a control step of controlling charging / discharging by the charger / discharger in accordance with the established plan.
  6. The power system control method according to claim 5,
    In the prediction step, the power generation amount and the demand power amount are predicted for each time zone,
    The planning step includes
    A first calculation step of calculating, as a surplus power total amount, a total amount of difference between the power generation amount and the demand power amount for each time zone in which the power generation amount is greater than the demand power amount;
    A second calculation step of calculating a difference between the charged power amount and the rated capacity of the storage battery as an empty capacity of the storage battery;
    When the free capacity is smaller than the total surplus power, the charging / discharging of the differential power corresponding to the difference between the free capacity and the total surplus power is performed before the surplus time period in which the power generation amount is greater than the demand power. And a first planning step for making a plan for causing the electric device to discharge.
  7. The power system control method according to claim 6,
    The distribution board corresponds to a difference between the discharge power amount and the power consumption amount when the discharge power amount discharged by the charger / discharger is larger than the power consumption amount consumed by the power load. Reverse power flow to the power system
    In the first planning step, when the free capacity is smaller than the surplus power total amount, the reverse power flow is not performed when the difference power amount is equal to or less than the total amount of the demand power amount before the surplus time zone. , Make a plan to discharge the difference power amount to the charger / discharger, and if the difference power amount is larger than the total amount of the demand power amount before the surplus time zone, the difference power amount and the surplus time zone before A method for controlling an electric power system, wherein a plan is made to cause the charger / discharger to discharge the difference power amount so that the reverse flow is performed by an amount of power corresponding to a difference from a total amount of demand power amount.
  8. In the control method of the electric power system according to claim 6 or 7,
    The planning step includes
    A third calculation step of calculating, as a peak power total amount, a total amount of difference between the demand power amount and the specified value for each time zone in which the demand power amount is greater than a preset specified value;
    When the total peak power is larger than the available capacity, the charger / discharger is discharged so that the available capacity becomes equal to or less than the total peak power before the time when the demand power is greater than the specified value. And a second planning step. A method for controlling the power system.
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