JP6055198B2 - Power control system - Google Patents

Description

  The present invention relates to a power control system that controls distribution of power supplied from a solar power generation device, a power storage device, and a system power network in a building including the solar power generation device and the power storage device.

  2. Description of the Related Art Conventionally, control for reducing power charges and leveling an electric load for a house including a solar power generation device and a power storage device is known (see Patent Documents 1-3).

  For example, Patent Document 1 discloses an energy management method in which a method of using surplus power generated by a solar power generation device can be determined based on a lifestyle including values and life of residents and reflected in control. A system is disclosed.

  Patent Document 2 discloses a control method for effectively using the electric power stored in the power storage means in a residential power storage system including solar power generation means and power storage means.

  Furthermore, in Patent Document 3, in order to review the control pattern applied to the power control system, a control pattern that has the highest evaluation when operating for a long period of 15 to 60 days is found, and thereafter A power control system applied to control is disclosed.

JP2012-5168A Japanese Patent No. 3759151 JP 2012-16258 A

  However, the systems disclosed in Patent Documents 1 and 2 are not problematic for residents who know the desired operation mode by themselves, but there is not enough information for residents who do not know which operation mode to select. doing.

  In addition, the power control system disclosed in Patent Document 3 is configured to review the control pattern being applied every predetermined period, but only the power rate is used as an evaluation index, for example, to reduce power supply from the grid power network as much as possible. If not, the control may continue as it is even if the evaluation is not good.

  Therefore, an object of the present invention is to provide an electric power control system in which materials for determining an operation mode are sufficiently presented.

  To achieve the above object, a power control system of the present invention is a power control system for a building including a solar power generation device and a power storage device, and a first mode connecting the solar power generation device and the power storage device, It is possible to switch between the second mode connecting the grid power network and the power storage device, and the power rate prediction means for predicting the power rate of the first mode and the second mode, respectively, or the first mode and the second mode At least one of the environmental load prediction means for predicting the environmental load of each, and an output means for outputting a predicted value by at least one of the power rate prediction means or the environmental load prediction means, and in the first mode, the solar load Control is performed to charge the power storage device with surplus power that cannot be consumed by the power load device of the building among the power generated by the photovoltaic power generation device, and the second module The surplus power that cannot be consumed by the power load device of the building out of the power generated by the solar power generation device is caused to flow backward to the grid power network, and the power storage device has the grid power network at midnight or at night. It controls to charge the electric power supplied from.

  Specifically, a power control system for a building including a solar power generation device and a power storage device, the first switch connecting the solar power generation device and the power storage device, and the second switch connecting the grid power network and the power storage device. A switching device for switching between, a power charge prediction means for predicting a power charge when the first switch is connected and a power charge when the second switch is connected, and an environment when the first switch is connected An environmental load prediction means for predicting a load and an environmental load when the second switch is connected; an output means for outputting a predicted value by the power charge prediction means and the environmental load prediction means; and an output result by the output means. And a control device for controlling the switching device.

  Here, in the control device, when the first switch is connected, the power storage device is charged with surplus power that cannot be consumed by the power load device of the building among the power generated by the solar power generation device. When the second switch is connected, the surplus power that has not been consumed by the power load device of the building among the power generated by the solar power generation device is caused to flow backward to the grid power network. The power storage device can be configured to perform control for charging power supplied from the grid power network at midnight or at night.

  Further, the environmental load prediction means may be configured to convert the amount of power supplied from the grid power network to the building into carbon dioxide emission. Furthermore, it is preferable that the output means outputs a result obtained by converting a predicted value by the environmental load predicting means into a monetary amount.

  And in the said control apparatus, it can be set as the structure which controls the said switching apparatus with the signal input based on the said output result. In addition, when there is a difference of a predetermined value or more between the predicted values by the power rate predicting means and the environmental load predicting means when the first switch is connected and when the second switch is connected, the switching device automatically The structure linked with control may be sufficient.

  Furthermore, when the supply of power from the grid power network is interrupted, the control device controls the switching device that connects the first switch, and includes the power generated by the solar power generation device. The power storage device may be configured to perform control for charging surplus power that cannot be consumed by the power load device of the building.

  The power control system of the present invention configured as described above includes a switching device that switches between a first switch that connects the photovoltaic power generation device to the power storage device and a second switch that connects the grid power network. Moreover, the predicted value of the electric power charge and the environmental load is output respectively when the first switch is connected and when the second switch is connected.

  For this reason, it is possible to decide which of the first switch and the second switch should be connected based on the predicted value of the electric power charge and the environmental load.

  For example, when the first switch is connected, surplus power that could not be consumed at that time among the power generated by the solar power generation device can be charged to the power storage device and used when there is no power generation. The power supply from the grid power network can be reduced as much as possible.

  On the other hand, when the second switch is connected, surplus power that has not been consumed at that time among the power generated by the solar power generation device is sold to the grid power network, and the power storage device is connected to the grid at midnight or night Economic operation can be performed by charging inexpensive power from the power grid.

  In addition, when the environmental load prediction means converts the amount of power supplied from the grid power network into the amount of carbon dioxide emissions, the connection by the first switch that reduces the power supply from the grid power network is selected. It becomes the judgment material of. Furthermore, if the predicted value of the environmental load is converted into the same amount as the power charge, it becomes possible to make a judgment that combines the two types of predicted values.

  Further, the control of the switching device may be performed by a signal input by the resident looking at the output result, or may be automatically performed from the output result. In the former case, the intention of the resident can be sufficiently reflected, and in the latter case, switching errors can be eliminated.

  Furthermore, if the first switch is connected when the power supply from the grid power supply is cut off, the power load device cannot be used at all even in the event of a power failure due to an earthquake disaster or damage to the transmission line. It can be avoided.

It is a block diagram explaining the structure of the power control system of embodiment of this invention. It is explanatory drawing which showed control of the power control system at the time of connecting a 1st switch. It is explanatory drawing which showed control of the power control system at the time of connecting a 2nd switch. It is explanatory drawing which showed control of the power control system at the time of a power failure. It is the graph which showed the simulation result at the time of connecting the 1st switch. It is the graph which showed the simulation result at the time of connecting the 2nd switch. It is the graph which showed the simulation result at the time of a power failure. It is explanatory drawing which showed an example which output the output result to the display monitor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram for explaining a schematic configuration of the power control system of the present embodiment. First, the overall configuration of the power control system will be described with reference to FIG.

  A house H as a building controlled by this power control system is connected to a grid power network 8 as a power grid for receiving power supply from grid power such as a power plant of a power company or a cogeneration facility installed in each region. Has been.

  Further, the house H includes a solar power generation device 4 as a distributed power generation device and a power storage device 5 that temporarily stores electric power.

  The solar power generation device 4 is a device that generates power by directly converting sunlight as solar energy into electric power by using a solar cell. This solar power generation device 4 is a device that can supply power only during a time period in which sunlight can be received.

  Moreover, the DC power generated by the solar power generation device 4 is usually used after being converted into AC power by a power conditioner (not shown). Furthermore, when the power storage device 5 is charged or discharged from the power storage device 5, direct current and alternating current are converted by a power conditioner (not shown).

  In addition, when a part or all of the power load device 61 described later is a device that operates with direct current, the power generated by the solar power generation device 4 or the power discharged from the power storage device 5 is used as direct current. You can also

  In addition, various power load devices 61 to which power is supplied through the distribution board 6 are installed in the house H. For example, an air conditioner such as an air conditioner, a lighting device such as a lighting stand or ceiling light, and a home appliance such as a refrigerator or a television are operated by electric power.

  Furthermore, the electric vehicle or the plug-in hybrid car becomes the power load device 61 when charging is performed for running. Similarly to the power storage device 5, when discharging for the power load device 61 of the house H, the power storage device 5 is obtained.

  And the electric power control system of this Embodiment is the switching apparatus 2 which switches a 1st switch and a 2nd switch, the prediction part 3 which has the electric power charge prediction means 31, and the environmental load prediction means 32, and the prediction by the prediction part 3 An output means 7 for outputting a value and a control device 1 for controlling the switching device 2 based on the output result of the output means 7 are provided.

  The first switch of the switching device 2 is a switch that connects the solar power generation device 4 and the power storage device 5. In the case of connection using the first switch, only the electric power generated by the solar power generation device 4 is charged in the power storage device 5.

  On the other hand, the second switch is a switch that connects the grid power network 8 and the power storage device 5. When connecting with the second switch, only the power supplied from the grid power network 8 is charged in the power storage device 5.

  The switching between the first switch and the second switch is performed by a signal output from the control device 1 to the switching device 2. The control when connected by the first switch will be described with reference to FIGS.

  First, the power generated by the solar power generation device 4 is consumed by the power load device 61 of the house H. That is, the electric power generated by the solar power generation device 4 flows toward the distribution board 6 via the switching device 2 connected by the first switch, and is supplied to the power load device 61 connected to the distribution board 6. The

  The surplus power that cannot be consumed by the power load device 61 flows into the power storage device 5 and is charged. The electric power charged in the power storage device 5 is discharged in a time zone in which power generation by the solar power generation device 4 is not reduced or performed, and is supplied to the power load device 61 via the distribution board 6.

  In addition, when the electric power charged in the power storage device 5 is discharged and becomes insufficient, the power is supplied from the grid power network 8. That is, the power flowing from the grid power network 8 to the first switch of the switching device 2 is supplied to the power load device 61 via the distribution board 6.

  Next, the control when connected by the second switch will be described with reference to FIGS. First, the power generated by the solar power generation device 4 is consumed by the power load device 61 of the house H. That is, the electric power generated by the photovoltaic power generation device 4 flows toward the distribution board 6 via the switching device 2 connected by the second switch, and is supplied to the power load device 61 connected to the distribution board 6. The

  The surplus power that cannot be consumed by the power load device 61 flows backward toward the grid power network 8. That is, surplus power generated by the solar power generation device 4 of the house H is sold to an electric power company connected to the grid power network 8.

  On the other hand, the power storage device 5 is charged with cheap power supplied from the grid power network 8 at midnight or at night. The electric power charged in the power storage device 5 is discharged in a time zone in which power generation by the solar power generation device 4 is not reduced or performed, and is supplied to the power load device 61 via the distribution board 6.

  In addition, when the electric power charged in the power storage device 5 is discharged and becomes insufficient, the power is supplied from the grid power network 8. That is, the power flowing from the grid power network 8 to the second switch of the switching device 2 is supplied to the power load device 61 via the distribution board 6.

  On the other hand, the case where the supply of electric power from the grid power network 8 is interrupted due to an earthquake disaster, a lightning strike, a trouble in the grid power network 8, or the like will be described with reference to FIGS.

  Even in such an emergency, when power is generated by the solar power generation device 4, the power is supplied to the power load device 61 of the house H. That is, the electric power generated by the solar power generation device 4 flows toward the distribution board 6 via the switching device 2 connected by the first switch, and is supplied to the power load device 61 connected to the distribution board 6. The

  The surplus power that cannot be consumed by the power load device 61 flows into the power storage device 5 and is charged. Even in the time of power generation by the solar power generation device 4 in an emergency, suppressing the operation of the power load device 61 may increase surplus power and increase the amount of charge to the power storage device 5. it can.

  By effectively using the power charged in the power storage device 5, necessary power load devices 61 such as a living space lighting and a refrigerator are operated even in an emergency when the power supply from the grid power network 8 is cut off. be able to.

  In such an emergency, even if the electric power charged in the power storage device 5 is discharged and becomes insufficient, it cannot be supplied from the grid power network 8, but in the morning the sunlight shines and solar power generation When the power generation by the device 4 is performed, the power load device 61 can be operated again.

  And control of the switching apparatus 2 by the control apparatus 1 is performed based on the predicted value by the estimation part 3. FIG. The prediction unit 3 includes a power charge prediction means 31 that predicts a power charge when the first switch is connected and a power charge when the second switch is connected, an environmental load when the first switch is connected, and a second Environmental load predicting means 32 for predicting the environmental load when the switch is connected is provided. The prediction unit 3 is connected to a database 33 in which data necessary for prediction calculation is stored.

  The power rate prediction means 31 calculates the power rate required for the house H in two cases when the first switch is connected and when the second switch is connected. This electric power charge is a total amount obtained by subtracting an amount based on electric power (power sold) sold to the electric power grid 8 from an amount based on electric power purchased from the electric power grid 8 (power purchased).

  The value stored in the database 33 is used for the price of power purchase or power sale. The purchase price varies with time during the day. For example, midnight discount prices from 23:00 to 7pm, living time prices from 7 to 10am, daytime prices from 10am to 17:00, living time prices from 17:00 to 23:00 are stored. Yes.

  In addition, when a power company or the like connected to the grid power network 8 purchases the power generated by the solar power generation device 4, the power selling price is also stored in the database 33. Further, the database 33 stores data relating to the power generation amount of the solar power generation device 4 and the power consumption amount of the house H.

  For example, measurement means for measuring the power generation amount of the solar power generation device 4 and the power consumption of the house H is attached to the house H, and the measurement values measured by the measurement means are stored in the database 33. And the measured value measured at the same time one year ago or several years can be used for the calculation of the power rate prediction means 31.

  Moreover, the average value of the measured value etc. which were measured in the house of the same area where the area, equipment, family structure, etc. are similar to the house H can be stored in the database 33 and used for the calculation of the prediction.

  Furthermore, it is possible to store a past actual power charge value of the house H in the database 33 and to estimate an approximate power consumption based on the actual value. Moreover, the electric power generation amount of the solar power generation device 4 can also be estimated by a well-known approximate method based on the area and the installation direction.

  On the other hand, the environmental load prediction means 32 is a means for predicting the load that the power consumption of the house H places on the global environment. For example, an electric power company emits carbon dioxide when generating power, and places a burden on the global environment. Therefore, when the electric power generated by the electric power company is purchased from the grid power network 8, the residents of the house H are burdening the global environment accordingly.

  Therefore, the environmental load predicting means 32 calculates the amount of power purchased from the grid power network 8 by converting it into carbon dioxide emission. The database 33 stores data on how much carbon dioxide emissions are converted into unit electric energy.

  In addition, when power is generated by crane energy that does not emit carbon dioxide as in the solar power generation device 4, the amount of carbon dioxide emission can be reduced accordingly. On the other hand, if a country or company is obligated to reduce carbon dioxide emissions, the economic value of carbon dioxide reduction will be recognized. It becomes possible to convert it into the amount of money. Therefore, when a price related to the emission amount of carbon dioxide is set, the emission price is also stored in the database 33.

  The result (predicted value) calculated by the prediction unit 3 in this way is output to the output means 7 via the control device 1. The output means 7 can be a computer display monitor, a printer, or a storage device such as a hard disk, temporary storage memory, or optical disk.

  For example, when the output unit 7 is a display monitor or a printer, a resident who has seen the output result based on the predicted value of the prediction unit 3 inputs a mode he / she wants to drive using an input unit (not shown) such as a mouse or a keyboard, The input signal can be transmitted to the switching device 2 via the control device 1.

  Further, when outputting the output result to the storage device together with the output means 7 such as a display monitor, the control device 1 acquires necessary data from the storage device and generates a signal for controlling the switching device 2. can do.

  Next, the processing flow of the power control system of this embodiment will be described with simulation results.

  The calculation of the prediction unit 3 of the power control system described below and the control of the switching device 2 based on the calculation result may be performed at any timing. For example, when installing the solar power generation device 4 or the power storage device 5, when the power price is updated, when changing the season, when you want to examine the environmental load on the earth and energy saving, we wanted to do economic driving Or emergency such as an earthquake disaster.

  First, various conditions such as the power generation capacity (kW) of the solar power generation device 4 and the power storage capacity (kW) of the power storage device 5 are input to perform the calculation. This input can be performed from a terminal (not shown) connected to the system, but may be extracted from the database 33. Moreover, the structure which detects automatically the specification of the solar power generation device 4 and the electrical storage apparatus 5 connected to the system may be sufficient.

Then, the prediction unit 3 predicts the power charge and the environmental load (CO ₂ emission amount) when connected by the first switch (see FIG. 2). Hereinafter, this operation mode is referred to as “green mode” (first mode).

  In the green mode, as described above, operation is performed so that as much power as possible generated by the solar power generation device 4 is consumed in the house H so as not to purchase power from the grid power network 8 as much as possible.

  FIG. 5 shows the result of predicting the operation status of the power control system for a certain day. In this green mode, only the amount of power consumed by the power load device 61 is purchased from the grid power network 8 at night or midnight after the power storage device 5 has been discharged.

  Then, when the sun rises and the power generation by the solar power generation device 4 starts, the generated power is supplied to the power load device 61, and when the generated power has surplus power, the power storage device 5 is charged.

  Further, when the power storage device 5 is fully charged, the power generated by the solar power generation device 4 is caused to flow backward to the grid power network 8 to sell power. Further, when the sun sets and the power generation by the solar power generation device 4 ends, the power stored in the power storage device 5 is discharged and supplied to the power load device 61.

  The power charge prediction means 31 predicts the power charge when operating in such a green mode. The power generation amount of the solar power generation device 4, the power consumption amount of the power load device 61, the power purchase price and the power sale price for each time zone necessary for this prediction are acquired from the database 33.

  On the other hand, the environmental load predicting means 32 predicts the amount of carbon dioxide emitted when operating in the green mode. That is, the total emission of carbon dioxide in the house H is obtained by obtaining the carbon dioxide emission amount per unit power amount from the database 33 and multiplying the power amount purchased from the grid power network 8 by the emission amount per unit power amount. Calculate the amount.

  If the emission price is stored in the database 33, the data is taken in and multiplied by the total emission amount, thereby converting the carbon dioxide emission amount into a monetary amount.

  Here, in general, the housing H reduces the emission of carbon dioxide by calculating a value obtained by multiplying the amount of power generated by the solar power generation device 4 with the amount of discharge per unit power amount and the amount of discharge amount. It is often done to calculate the amount produced and its economic value.

  However, when the operation mode is compared under the same conditions for the power generation amount of the solar power generation device 4 and the power consumption amount of the power load device 61, the calculation material for the reduction amount of carbon dioxide that is generally performed is a criterion. Will not Increase.

  Therefore, in the power control system of the present embodiment, the amount of carbon dioxide emission based on the amount of power purchased from the grid power network 8 is calculated so that the evaluation is higher as the amount of power purchased from the grid power network 8 is smaller, It will be added as a negative evaluation.

Subsequently, the prediction unit 3 predicts the power charge and the environmental load (CO ₂ emission amount) when connected by the second switch (see FIG. 3). Hereinafter, this operation mode is referred to as “economy mode” (second mode).

  In the economy mode, as described above, an operation of storing power to the grid power network 8 and storing power in a time zone where the power purchase price is low is performed so that the power charge is reduced. FIG. 6 shows a result of predicting the economy mode driving situation on the same day as the day when the green mode calculation is performed.

  In this economy mode, the amount of power consumed by the power load device 61 is purchased from the grid power network 8 at night after the power storage device 5 is completely discharged, and stored at the midnight discount price period when the power purchase price is the lowest. The device 5 is charged by the power supplied from the system power network 8.

  Then, when power generation by the solar power generation device 4 starts, the generated power is supplied to the power load device 61, and when there is surplus power in the generated power, the power is supplied to the grid power network 8 in reverse flow. . If this power selling price is higher than the midnight discount price, the power charge of the house H will be cheaper if the surplus power is charged to the power storage device 5 and then charged from the system power grid 8 at midnight rather than charging the power storage device 5.

  Further, when the sun sets and the power generation by the solar power generation device 4 is completed, the power of the power storage device 5 purchased and charged from the grid power network 8 is discharged and supplied to the power load device 61 during the midnight discount price period. .

  In such an economy mode, the amount of electric power purchased from the grid power network 8 is greater than in the green mode, so that the predicted value by the environmental load predicting means 32 is also larger than in the economy mode.

  Here, the operation state of the power control system when the power supply from the grid power network 8 is interrupted (see FIG. 4) will also be described with reference to FIG. Hereinafter, this operation mode is referred to as “reliable mode” (third mode).

  The connection in the secure mode is the same first switch connection as in the green mode. However, since it is disconnected from the grid power network 8, power purchase or power sale is not performed. When driving in this safe mode, even if the power supply from the grid power grid 8 is stopped due to an earthquake disaster or damage to the transmission line, the solar power generation device 4 can generate the minimum amount of power not only during the daytime but also at nighttime. The power load device 61 can be used.

  Here, the switching to the safe mode is preferably performed automatically when the power supply from the grid power network 8 is cut off. In addition, the power load device 61 that can be used in the secure mode can be specified in advance.

  Then, the predicted value calculated by the prediction unit 3 is output as an output result to output means 7 such as a display monitor 7a as shown in FIG. This output result is a predicted value when driving in the green mode and when driving in the economy mode, or a value based thereon.

  For example, when using only the power charge as a criterion, the a1 yen for the green mode in the top row of the output result and the a2 yen for the economy mode may be compared. Usually, a1> a2. a3 yen is the value obtained by subtracting a2 yen from a1 yen.

On the other hand, when only the environmental load (CO ₂ emission amount) is used as the judgment material, the b1 ton of the green mode and the b2 ton of the economy mode in the second row may be compared. Usually, b1 <b2. b3 tons is b1 tons minus b2 tons.

In addition, when performing a comprehensive evaluation that combines power charges and environmental impact, the d1 yen for the green mode at the bottom and the d2 yen for the economy mode may be compared. Here, in order to perform comprehensive evaluation, as shown in parentheses in the second row, CO ₂ emissions are converted into monetary amounts. These c1 circle and c2 circle are positive values, and usually c1 <c2. In other words, the electricity rate is cheaper in the economy mode, but the converted amount of CO ₂ emissions is higher in the economy mode. Therefore, in the overall evaluation, which mode evaluation (d1 yen, d2 yen) It can not be generally said whether it will be high, and the resident can determine which mode to select by looking at this output result.

  Next, the operation of the power control system of the present embodiment will be described.

  The power control system of the present embodiment configured as described above includes a first switch that connects the photovoltaic power generation device 4 to the power storage device 5 and a second switch that connects the grid power network 8 to the power storage device 5. A switching device 2 for switching is provided.

  In addition, when the first switch is connected and when the second switch is connected, the power charge predicting means 31 and the environmental load predicting means 32 calculate the predicted values of the power charge and the environmental load, respectively. The result is output.

  For this reason, it is possible to decide which of the first switch and the second switch should be connected based on the predicted value of the electric power charge and the environmental load.

  For example, when the first switch is connected, surplus power that could not be consumed at that time among the power generated by the solar power generation device 4 is charged to the power storage device 5 and used when there is no power generation. Therefore, the power supply from the grid power network 8 can be reduced as much as possible.

  On the other hand, when the second switch is connected, surplus power that could not be consumed at that time among the power generated by the solar power generation device 4 is sold to the grid power network 8 and the power storage device 5 is connected to the midnight or Economical operation can be performed by charging inexpensive power from the grid power network 8 at night.

  If the environmental load prediction means 32 converts the amount of power supplied from the grid power network 8 into the amount of carbon dioxide emission, the connection by the first switch that reduces the power supply from the grid power network 8 is used. It will be a judgment material when selecting. Furthermore, if the predicted value of the environmental load is converted into the same amount as the power charge, it becomes possible to make a judgment that combines the two types of predicted values.

  Further, the control of the switching device 2 is performed by the resident selecting the mode by looking at the output result of the display monitor 7a, and an input signal designating the mode to be selected by the mouse or the keyboard is transmitted to the switching device 2 via the control device 1. Is done. Thus, when making a resident select a mode, a resident's intention can fully be reflected.

  On the other hand, the switching device 2 can be controlled by automatically generating a signal from the output result. For example, when the absolute value of the d3 circle of the comprehensive evaluation becomes a predetermined value or more, the control device 1 generates a signal for selecting the mode with the smaller comprehensive evaluation value, and controls the switching device 2 Can do. When automatic control is performed in this way, switching errors can be eliminated.

  Furthermore, if the first switch is connected when the supply of power from the grid power network 8 is interrupted, the power load device 61 cannot be used at all in the event of a power failure due to an earthquake disaster or damage to the transmission line. It can be prevented from entering a state.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

  For example, in the above-described embodiment, only the solar power generation device 4 is described as a distributed power generation device. However, even in a power control system for a house H including a fuel cell, a small generator using fossil fuel, and the like. Good.

  The power price described in the above embodiment is an example, and the time when the power price changes and the number of time zones where the price is different vary depending on the management policy of the power company and the policy at that time.

  Furthermore, when an electric power company purchases the amount of carbon dioxide emissions that can be reduced by generating power with the solar power generation device 4, the amount calculated based on the power generation amount and the emission price of the solar power generation device 4. Can be deducted from the electricity bill. Even in this case, the prediction by the environmental load prediction means 32 is performed separately.

  Moreover, in the said embodiment, although prediction was carried out by both the electric power rate prediction means 31 and the environmental load prediction means 32, it is not limited to this and any one may be sufficient.

DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Switching apparatus 3 Prediction part 31 Electricity rate prediction means 32 Environmental load prediction means 4 Photovoltaic power generation apparatus 5 Power storage apparatus 61 Electric power load apparatus 7 Output means 8 System power network H A house (building)

Claims (1)

A power control system for a building including a solar power generation device and a power storage device,
It is possible to switch between a first mode connecting the photovoltaic power generation device and the power storage device and a second mode connecting the grid power network and the power storage device,
A power rate prediction means for predicting a power rate in each of the first mode and the second mode;
Environmental load prediction means for predicting environmental loads in the first mode and the second mode,
An output means for outputting a predicted value by the power rate prediction means and the environmental load prediction means;
A control device that performs switching control between the first mode and the second mode based on the output result by the output means;
In the first mode, control is performed to charge the power storage device with surplus power that has not been consumed by the power load device of the building among the power generated by the solar power generation device, and in the second mode, the solar power is charged. The surplus power that could not be consumed by the power load device of the building out of the power generated by the power generation device is caused to flow backward to the grid power network, and the power is supplied to the power storage device from the grid power network at midnight or at night Control to charge,
The control device automatically switches between the first mode and the second mode when there is a difference of a predetermined value or more in the evaluation of the prediction values obtained by the power rate prediction means and the environmental load prediction means. A power control system characterized by performing control.