JP2017195752A - Electric power control system and power control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power control system arranged so that a power supplying performance can be ensured in the event of power outage.SOLUTION: An electric power control system comprises: a prediction part for predicting an amount of power generation of a solar cell panel 1 and an amount of power consumption by a house H1; an electricity price data base 53 for storing electricity prices; and a charge/discharge control part 63 for controlling the charge and discharge of a storage battery 2 based on a power consumption predicted value C[t] and an amount-of-power generation predicted value S[t]. The charge/discharge control part 63 sets, as a discharge demand time zone, a time zone during which the power consumption predicted value C[t] is over the amount-of-power generation predicted value S[t] and thus a discharge demand D[t] appears. In setting a discharge time, the charge/discharge control part preferentially sets, as the discharge time, a time during which an electricity price falls in a relatively high-price range to sets the discharge time, first. Further, if one price range includes a plurality of discharge demand time zones, the charge/discharge control part sets the closest discharge demand time zone to a start-of-charge time before the start-of-charge time as the discharge time preferentially.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power control system and a power control method for a building including a solar power generation device and a power storage device.

2. Description of the Related Art Conventionally, in a power control system for a house equipped with a solar power generation device and a power storage device, a power control system that sets a charge / discharge schedule so that the dischargeable capacity of the power storage device can be used effectively while ensuring economy is known. (See Patent Document 1).
This conventional technology determines a discharge start time based on a prediction means for predicting the power generation amount and power consumption amount of a solar cell panel, a power price database storing a power price switching time, and a power price, power consumption, etc. Discharge start time determining means. By appropriately setting the discharge start time, it is possible to effectively use the power storage device with a small calculation load while ensuring economic efficiency.

Japanese Patent No. 5484621

  However, in the above-described prior art, since the discharge start time is set based only on the economy, there is a possibility that the remaining amount of power stored in the power storage device may disappear at a relatively early time. For this reason, when a power failure occurs due to a disaster or the like, there is a possibility that sufficient electric power cannot be held in the power storage device.

  Accordingly, an object of the present invention is to provide a power control system and a power control method capable of ensuring power supply performance during a power failure.

In order to achieve the above object, the power control system of the present invention provides:
A power control system for controlling power supply to a building including a solar power generation device and a power storage device,
A prediction unit for predicting the power generation amount of the solar power generation device and the power consumption amount of the building;
A power price storage unit that stores a power price for each time zone of externally supplied power to the building;
A charge / discharge control unit that controls charging and discharging of the power storage device based on the predicted power consumption and the power generation amount;
With
The charging / discharging control unit is configured to set a charging time set in advance in a time zone in which the predicted power consumption exceeds the predicted power generation amount in setting a discharge time of a length capable of discharging the remaining amount of power stored in the power storage device. A time prior to the start time and prior to the charge start time is preferentially set.

The charge / discharge control unit sets the discharge time,
The time when the predicted power consumption exceeds the predicted power generation amount is set as a discharge demand time zone in which the discharge demand amount of the power storage device is generated,
Among the discharge demand time zones, first, the discharge demand time zone in which the power price is present in a relatively high price time zone is preferentially selected as the discharge time, and further in the time zone at the same price. The discharge demand time zone close to the charge start time is preferably selected as the discharge time.
In addition, the charge / discharge control unit determines the discharge demand amount.
T is a predetermined unit time zone, the discharge demand is D [t], the predicted power generation value is S [t], the predicted power consumption amount is C [t], and discharge is possible per unit time zone of the power storage device. When the upper limit discharge amount is A, the discharge demand amount is obtained by calculation of D [t] = S [t] −C [t], and when the obtained discharge demand amount D [t] is negative, When the discharge demand amount D [t] is 0 and the obtained discharge demand amount D [t] exceeds the upper limit discharge amount A, the discharge demand amount D [t] is set as the upper limit discharge amount A. It is preferable to do.
Furthermore, the charge / discharge control unit is configured to set the discharge time and the discharge amount.
In a continuous time zone with the same price, t is a predetermined unit time, O [t] is the amount of discharge of the power storage device, B is the remaining power storage time of the same price zone, and B is the high priority time zone of the remaining power charge B. L [t] is the remaining amount after the discharge is performed, and the calculation is performed retroactively for each time period from the time period close to the charging start time,
In the time zone ty immediately before the charging start time,
When D [ty] <B, O [ty] = D [ty], L [ty] = D [ty]
When D [ty] <B, O [ty] = B, L [ty] = 0,
In a time zone t that goes back the time zone of the predetermined unit from the time zone ty,
When D [t] <B−L [t + 1], O [t] = D [t], L [t] = L [t + 1] + D [t],
When D [t] <B−L [t + 1] is not satisfied, it is preferable that O [t] = B−L [t + 1] and L [t] = 0.

In order to achieve the above object, the power control method of the present invention includes:
A power generation amount of the solar power generation device and a power consumption amount of the building of a building including the solar power generation device and the power storage device are predicted, and based on the predicted power consumption amount and the power generation amount, A power control method for controlling charging and discharging,
In setting the discharge time of a length capable of discharging the remaining amount of electricity stored in the power storage device,
A step of setting a time zone in which the predicted power consumption exceeds the predicted power generation amount and a discharge demand amount of the power storage device occurs as a discharge demand time zone;
First, the discharge demand time zone in which the power price is present in a relatively high price time period is selected as the discharge time in the discharge demand time zone, and charging is started in the same price time zone. Preferentially selecting the discharge demand time zone close to the time as the discharge time;
It is characterized by providing.

  In the power control system of the present invention, the discharge time is set prior to the charge start time and prior to the time close to the charge start time. It is possible to ensure a long period of time during which power can be supplied during a power failure.

Furthermore, in setting the discharge time, first of all, in the discharge demand time zone, priority is given to the one with a high power price, and further, the one near the charge start time in the same price time zone is selected with priority. It is possible to secure the power supply performance at the time of a power failure while securing the economy.
When the discharge demand amount D [t] exceeds the upper limit discharge amount A, the discharge demand amount D [t] is set as the upper limit discharge amount A, and the upper limit discharge amount of the discharge amount per hour of the power storage device is set. The discharge time can be set without performing discharge exceeding A.
Therefore, an appropriate discharge time can be set according to the discharge capacity of the power storage device.

  Furthermore, the discharge time is calculated as follows: discharge demand amount D [t], power storage device discharge amount O [t], power storage remaining amount B from the power storage device in the same price period, and remaining amount L [t] after discharge is performed. In the case of setting by comparison, the calculation of the discharge time can be easily calculated, and the discharge time can be set by a process with a light calculation load.

In the power control method of the present invention, when setting the discharge time, first, a discharge demand time zone with a high power price is set as the discharge time, and in the same power price zone, a time zone close to the charge start time. Was set to.
Therefore, it is possible to ensure the power supply performance at the time of a power failure while ensuring economic efficiency.

1 is an overall system diagram schematically showing an overall configuration of a power control system according to a first embodiment of the present invention. It is a block diagram which shows the electric power control system of Embodiment 1 in detail. It is an electric power price explanatory view showing typically the electric power price system in the electric power control system of Embodiment 1. 3 is a flowchart showing a flow of processing for predicting power consumption in the power control system of the first embodiment. 4 is a flowchart showing a flow of processing for setting a discharge amount and a discharge time and executing charge / discharge in the power control system of the first embodiment. 6 is a time chart showing a setting example of a predicted power consumption amount, a predicted power generation amount and a discharge demand amount, and a discharge amount and discharge time in an operation example of the power control system of the first embodiment. 6 is a time chart showing an example of setting of power consumption predicted value, power generation predicted value and discharge demand amount, and discharge amount and discharge time in an operation example of a comparative example with the first embodiment. It is a power price explanatory drawing which shows typically the other power price system to which the power control system of Embodiment 1 is applied. Example of setting of power consumption predicted value, power generation predicted value and discharge demand amount, and discharge amount and discharge time in an operation example when the power control system of the first embodiment is applied to the power price system shown in FIG. It is a time chart which shows.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
First, the overall configuration of the power control system according to the first embodiment will be described with reference to FIG. In this power control system, houses H1,..., HX as buildings to be controlled are power networks for receiving power supply from grid power such as power generation plants of power companies and cogeneration facilities installed in each region. Connected to the grid power network.

  Moreover, these houses H1, ... are provided with a solar cell panel 1 as a solar power generation device and a storage battery 2 as a power storage device for temporarily storing electric power. Further, these houses H1,... Are connected to an external communication network N such as the Internet. Then, transmission / reception of data such as measurement values and calculation processing results, transmission / reception of control signals, and the like are performed with an external management server 5 also connected to the communication network N. In the following description, the house H1,... Shows the house H1 as a representative.

  FIG. 2 is a block diagram showing the power control system of the first embodiment schematically shown in FIG. This power control system has a configuration arranged in the house H1 as the house side and a configuration arranged in the management server 5 as the server side.

First, the configuration on the house H1 side to be processed will be described.
The house H1 includes a solar battery panel 1, a storage battery 2, a measuring device 3 that measures the amount of power generated per hour of the solar battery panel 1 and the power consumption per hour of the house H1, and a display monitor 4 as a display device. Mainly prepared.

The solar cell panel 1 is a device that generates sunlight by converting sunlight into electric power by using a solar cell.
The solar cell panel 1 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 cell panel 1 is normally used after being converted to AC power by a power conditioner (not shown). In addition, specifications, such as the capacity | capacitance of the electric power generation amount of the solar cell panel 1 installed in this house H1, are memorize | stored in the mansion information database 51 mentioned later by the management server 5 side.

  On the other hand, the storage battery 2 is also connected to a power conditioner (not shown) in the same manner as the solar battery panel 1, and charging / discharging is controlled. For example, the storage battery 2 is charged with low-power electric power such as midnight power supplied from the grid power network. Specifications such as the capacity and rated output of the stored battery 2 are also stored in a later-described house information database 51 on the management server 5 side.

  In addition, various loads that consume external power are installed in the house H1 through the distribution board. Examples of the various loads include an air conditioner such as an air conditioner, a hot water supply device, a lighting device such as a lighting stand and a ceiling light, and a home appliance such as a refrigerator and a television.

  Note that the electric vehicle and the plug-in hybrid vehicle, not shown, become a load when charging for traveling, and become a power storage device as with the storage battery 2 when discharged for the load of the house H1. .

The measuring device 3 measures the generated power actually generated by the solar cell panel 1 installed in the house H1. Moreover, the measuring device 3 also measures the power consumption consumed by the load installed in the house H1.
The measurement by the measuring device 3 can be performed every time at an arbitrary interval such as a second unit, a minute unit, or a time unit. And the data of the measured value measured by the measuring device 3 are memorize | stored in the power consumption log | history database 52 mentioned later by the management server 5 side.

  In the power consumption history database 52, the power consumption of an air conditioning load such as an air conditioner and a hot water supply load such as a hot water supply device that are easily affected by weather conditions such as temperature, and other loads that are not easily affected by the weather conditions such as temperature. Power consumption is categorized by load and stored.

  The display monitor 4 displays the measured value measured by the measuring device 3, the determination result by the charge / discharge control unit 63 described later on the management server 5 side, and the like. The display monitor 4 may be a dedicated terminal monitor or a screen of a general-purpose device such as a personal computer.

Next, the configuration on the management server 5 side connected to the house H1 via the communication network N will be described.
The management server 5 side includes a communication unit 71 as a communication unit, a control unit 6 that performs various controls, a house information database 51 as a storage unit, a power consumption history database 52, a power price database 53, a weather forecast database 54, an operation A pattern database 55 is provided.

  The communication unit 71 sends specifications, measurement values, processing requests, and the like of various facilities transmitted from the house H1 to the control unit 6 of the management server 5 and is stored in various databases 51, 52, 53, 54, and 55. Data, results of arithmetic processing performed by the control unit 6, update programs, and the like are sent to the house H1.

  The residence information database 51 includes a residence code (identification number) of each house H1,..., HX, an address associated with the residence code, year of construction, heat insulation performance, floor plan, electrical wiring, member used, solar panel Information such as 1 specification (power generation capacity) and storage battery 2 specifications (storage capacity, rated output) is stored.

  The power consumption history database 52 stores data of measurement values measured by the houses H1,..., HX and received by the management server 5 via the communication unit 71. By storing this measurement value in association with the house code, it is possible to identify which house H1,..., HX is the measurement result.

  Further, as described above, the power consumption history stored in the power consumption history database 52 includes the power consumption of an air conditioning load such as an air conditioner and a hot water supply load such as a hot water supply device that are easily affected by weather conditions such as temperature. The power consumption of other loads that are not easily affected by weather conditions such as temperature is stored in a category by load.

  The electric power price database 53 stores information on the electric power price (the electric power purchase price as seen from the resident side) that changes depending on the time of the day set by an electric power company or the like that supplies external grid power.

  For example, as shown in FIG. 3, in the charge system in this embodiment, the mid-price range in the morning from 17:00 to 10:00, and the high price range in the daytime from 10:00 to 17:00, Three types of power price ranges are set: a mid-price range in the evening from 23:00 to 23:00, and a low price range in the evening from 23:00 to 7:00 the next day.

  That is, the power price database 53 stores the time when the power price is switched and the power price of each time zone. The power price database 53 also stores a purchase price (a power selling price as viewed from the resident side) at which a power company or the like purchases the power generated by the solar cell panel 1.

  In the weather forecast database 54, the next day's weather such as the temperature and solar radiation in the whole country where the houses H1,..., HX are located, which are received from a server (not shown) such as the Japan Meteorological Agency or a weather forecast company through the communication network N. Forecast data is stored.

  In the operation pattern database 55 as the operation pattern storage means, various operation patterns of the air conditioner that is an air conditioning load and the hot water supply device that are installed in the houses H1,..., HX correspond to the weather forecast data. It is remembered.

  The control unit 6 includes a power consumption prediction unit 61, a generated power prediction unit 62, and a charge / discharge control unit 63.

  The power consumption prediction unit 61 is a means for predicting the power consumption per unit time (in the first embodiment, 1 hour is a unit time). For example, the power consumption for each hour of the house H1 on the next day can be predicted on the previous day. The power consumption prediction unit 61 predicts the power consumption for each hour of the air conditioning load and the hot water supply load, which are easily affected by weather conditions such as temperature, based on the weather forecast data, and is affected by weather conditions such as temperature. The power consumption for each hour of other difficult loads is predicted based on past history data, and these are summed to predict the power consumption for each hour of the house H1.

  Specifically, in predicting the power consumption for each time of the air conditioning load and the hot water supply load, the weather forecast data of the next day such as the temperature stored in the weather forecast database 54 is referred to (step S1A in FIG. 4). With reference to the operation pattern data (step S1B in FIG. 4), the power consumption prediction unit 61 predicts the power consumption for each hour (step S2 in FIG. 4). In predicting the power consumption for each hour of other loads, past history data stored in a category classified in the power consumption history database 52 is referred to (step S1C in FIG. 4), and the power consumption prediction unit 61 performs time Each power consumption is predicted (step S2 in FIG. 4). And these are totaled and the electric power consumption for every hour of the house H1 is estimated (FIG. 4 step S2).

The generated power prediction unit 62 predicts the amount of power generated by the solar cell panel 1 for each hour. For example, the power generation amount for each hour of the house H1 on the next day can be predicted on the previous day.
Specifically, in predicting the amount of power generation for each hour of the solar cell panel 1, the generated power prediction unit 62 refers to the weather forecast data for the next day such as the amount of solar radiation stored in the weather forecast database 54, and Predict the amount of power generation for each hour of H1.

  On the other hand, the electric energy that can be discharged from the storage battery 2 can be set as the set electric energy that can be discharged. For example, it is known that if all the electric power stored in the storage battery 2 is used up, the service life is shortened. Therefore, 97% of the full charge amount is set as a settable dischargeable electric energy amount or 70% in preparation for a sudden power failure. Can be set as a settable dischargeable electric energy. As described above, this set dischargeable electric energy is the remaining chargeable amount in the storage battery 2, which is referred to as the remaining charge amount.

  Then, charge / discharge of the storage battery 2 is controlled based on the predicted power consumption and power generation amount of the house H1 and the set dischargeable power amount of the storage battery 2.

Next, charge / discharge control by the control unit 6 will be described based on the flowchart of FIG.
In step S101, the generated power prediction unit 62 calculates a predicted power generation amount by the solar cell panel 1 for each time zone, and proceeds to the next step S102. For example, as shown in FIG. 6, the predicted power generation amount is a positive value in the sunshine hours, and is 0 at night.
Returning to FIG. 5, in step S102, a predicted power consumption amount in the house H1 for each time zone is calculated, and the process proceeds to the next step S103. For example, as illustrated in FIG. 6, the predicted power consumption amount has a low daytime value when the resident is absent and a particularly high value at night when the resident is at home. Further, at night, the power consumption prediction value becomes high because heat is stored in the hot water supply device and the storage battery 2 to be described later is charged using inexpensive electric power.

Returning to FIG. 5, in step S <b> 103, the charge / discharge control unit 63 calculates the discharge demand (D [t]) from the storage battery 2 for each time zone based on the predicted power generation amount and the predicted power consumption amount. The process proceeds to the next step S104. This discharge demand amount is a power demand amount exceeding the power generation amount in the building.
Here, the discharge demand (D [t]) is obtained by the following equation (1).
D [t] = S [t] −C [t] (1)
However, when D [t] <0, D [t] = 0, and when D [t]> A, D [t] = A.
In addition, t is a time zone of 1 hour unit, S [t] is a predicted power generation value, C [t] is a predicted power consumption value, and A is an upper limit of discharge per unit time (1 hour) of the storage battery 2. The upper limit discharge amount is a value.

That is, if the predicted power generation amount S [t] exceeds the predicted power consumption value C [t], there is no demand for discharge from the storage battery 2 (0), and the predicted power consumption amount C [t] is the predicted power generation amount. If the value S [t] is exceeded, it is assumed that there is a discharge demand from the storage battery 2, and the difference is defined as a discharge demand amount D [t]. When the difference exceeds the upper limit discharge amount A, the discharge demand amount D [t] is set to the upper limit discharge amount A (kWh).
Therefore, as shown in FIG. 6, the discharge demand amount D [t] is generated in a time zone when the predicted power generation amount S [t] is low, and is limited with the upper limit discharge amount A being the maximum value.

Returning to FIG. 5, in step S <b> 104, the charge / discharge amount of the storage battery 2 for each time zone is calculated.
Here, first, the charge amount and the charging time zone are calculated.
The charging time zone is set to a time zone (nighttime) at which the power price is the cheapest, and is set to an earlier time zone in an inexpensive time zone (nighttime). Therefore, in Embodiment 1, the charging time is set to a time zone after 23:00, and preferably the charging start time is set to 23:00. Moreover, in this Embodiment 1, since the time required until it becomes a full charge from the state which discharged | emitted all the amount of the electrical storage residual amount B which can be discharged of the storage battery 2 is set to about 3.5 hours, a charge time slot | zone is It is preferable to set the time around 23: 00 to 02:30. However, in consideration of other power demands, the optimum time zone is set while suppressing the total required amount to some extent.

Next, the amount of discharge and the discharge time from the storage battery 2 are set based on the discharge demand amount D [t].
In setting the discharge time, first, the high price range with the highest power price is set with priority. Therefore, if there is a discharge demand time zone in the daytime, the discharge time is set in the daytime. When there are a plurality of discharge demand time zones in the daytime high price zone, the discharge time is set from a time zone close to the charge start time.
In addition, when there is no discharge demand time zone in the daytime, or even when the discharge time is set in the daytime, when there is a remaining charge B that can be discharged in the storage battery 2 even if discharge is performed in the discharge time, Next, the discharge time is set in a time zone (late time zone in the present embodiment) close to the charge start time in the evening or morning, which is an expensive medium price range.

  Further, when there are a plurality of discharge demand time zones in the same price range, the time zone near the charge start time is set with priority in the time zone before the charge start time. When a plurality of unit time zones are included in this time zone, the discharge time and the storage device discharge amount O [t] are calculated as follows from the time zone close to the charging start time for each unit time zone. . B is the remaining power level of the storage battery 2 in a plurality of consecutive unit time zones, and L [t] is after discharging in a time zone having a higher priority than the corresponding time zone in the remaining power level B. It is the remaining amount.

  Here, when a plurality of continuous time zones are tx to ty (tx <ty), first, in the time zone ty closest to the charging time zone (the latest unit time zone from tx to ty), D [ty] When <B, O [ty] = D [ty] and L [ty] = D [ty]. On the other hand, when D [ty] <B, O [ty] = B and L [ty] = 0.

Next, in the time zone ty−1 = t immediately before the time zone ty (the one-step priority is low), when D [t] <B−L [t + 1], O [t] = D [ t], L [t] = L [t + 1] + D [t].
On the other hand, when other than D [t] <B−L [t + 1], O [t] = B−L [t + 1] and L [t] = 0.

Returning to FIG. 5, in step S105 following step S104, an operation plan (operation schedule) is created based on the charge amount for each time zone calculated in step S104 and the power storage device discharge amount O [t], and then step S106 is performed. Proceed to
In step S106, the operation of the storage battery 2 including the power conditioner is executed based on the operation plan.

(Operation of Embodiment 1)
Next, the operation of the first embodiment will be described based on the time charts of FIGS.
FIG. 6 shows an operation example of the power control system of the first embodiment of the present invention, and FIG. 7 shows an operation example of the comparative example of the first embodiment. The operation example of this comparative example is an operation example when the charge / discharge operation plan creation process of the present invention is not performed under the same conditions as the operation example of FIG.

In the control unit 6 in the power control system of the first embodiment, an operation plan (operation schedule) is created on the day before the operation plan creation date.
In creating the operation plan, first, the generated power prediction unit 62 of the control unit 6 calculates a predicted power generation value S [t] based on the weather forecast (clear weather) on the next day (step S101). The power generation amount predicted value S [t] (indicated by a one-dot chain line) in the operation examples of FIGS. 6 and 7 rises around 7:00, reaches a peak value around 11:00, and then reaches 0 around 16:00. The value rises in the vicinity.

  Next, the power consumption prediction unit 61 of the control unit 6 creates a predicted power consumption amount C [t] in the house H1 for each unit time (1 hour) (step S102). This power consumption prediction value C [t] is a low value between 7:00 and 16:00 when no resident is present, as indicated by the dotted lines in FIGS. Further, the predicted power consumption is a mountain shape that peaks around 20:00 from 16:00 to 23:00 in the evening until the resident comes home and goes to bed. Further, the predicted power consumption value C [t] is 3:00 in order to charge the storage battery 2 or to store heat in the hot water supply device as described later at 1:00 to 5:00 at night when the charge is low. It becomes a mountain shape peaking around 00.

  Therefore, when the power consumption prediction value C [t] exceeds the power generation prediction value S [t], it is necessary to receive power supply from the external power grid or the storage battery 2. Therefore, in the charge / discharge control unit 63 of the control unit 6, the discharge demand amount D from the storage battery 2 for each time zone is based on the difference between the predicted power consumption value C [t] and the predicted power generation value S [t]. [T] is calculated (step S103).

  6 and 7, the calculated discharge demand D [t] is shown by a bar graph in units of one hour. The discharge demand amount D [t] is limited by the upper limit discharge amount A of the dischargeable power amount of the storage battery 2.

  Next, the charge / discharge control unit 63 of the control unit 6 calculates the charge / discharge amount of the storage battery 2 by time (step S104). In calculating the charge / discharge amount, the charge time zone and the charge amount are set. In FIGS. 6 and 7, the charge time zone and the charge amount are displayed in black.

  In the first embodiment, the charging start time is set in advance at midnight (nighttime) after 23:00 when the power unit price is the cheapest. In addition, as will be described later, in this control, since the entire amount of the remaining amount of electricity stored in the storage battery 2 (set dischargeable electric energy) is discharged before starting charging, a so-called “empty” state is obtained. The charging end time is also set in advance from the chargeable amount per hour and the charged amount of the storage battery 2. In this operation example, it is assumed that the charging start time is 1:00 and the charging end time is about 4:30 as illustrated.

Next, the charge / discharge control unit 63 sets the power storage device discharge amount O [t] and the discharge time.
Here, first, the discharge time is set to a time zone with the highest electricity rate in which the discharge demand amount D [t] exists. In the first embodiment, as shown in FIG. 6, in the high price range in the daytime (10:00 to 17:00) where the power unit price is the highest, the discharge demand amount D [t only at 16:00 to 17:00. ] Is set. Therefore, the discharge time is set only in this time zone. In addition, when the discharge demand amount D [t] exists in a plurality of time zones in the daytime high price zone, the discharge time is set from the side near the charge start time.

Since the discharge demand amount D [t] set in the above high price range is less than the remaining amount of electricity B, there is a discharge demand amount D [t] in the middle price range in the morning and evening when the electricity rate is high next. The power storage device discharge amount O [t] and the discharge time are set in the time zone. In setting the discharge time in the middle price range in the morning and evening, in the first embodiment, the discharge is set to be performed before the charge start time and close to the charge start time, that is, as late as possible.
Therefore, in the first embodiment, in the evening (17:00 to 23:00), the discharge time is set from a time zone close to the charge start time.

Specifically, in setting the discharge time, the charge / discharge control unit 63 first discharges the power storage device in the time zone ty (ty = 22: 00 to 23:00) closest to the charge time zone in the medium price range. The amount is O [t] = discharge demand amount D [ty], and the remaining amount L [ty] = D [ty] after discharging in a time zone having a higher priority than the time zone.
That is, since the remaining amount B of electricity stored in this evening time zone is an amount close to the full charge amount, it is set as described above. The full charge amount (the total amount of power that can be discharged from the storage battery 2) is about three times the upper limit discharge amount A.

Next, the power storage device discharge amount O [t] in the time zone (ty-1 = 21: 0 to 22:00) before the discharge time is set. At this time, the remaining amount B of the storage battery 2 that can be discharged is about twice the maximum value of the discharge demand D [t], and the relationship D [t] <B−L [t + 1] is satisfied. It has become.
Accordingly, the power storage device discharge amount O [t] = discharge demand amount D [ty] and the remaining amount L [ty] = L [t + 1] + D [t]. In addition, from 21:00 to 22:00, the discharge demand amount D [t] is slightly lower than the upper limit discharge amount A.

When discharging is performed in the above time zone (t = ty-1 = 21: 00 to 22:00), the remaining amount B of the electricity storage is slightly smaller than the upper limit discharge amount A.
Therefore, the power storage device discharge amount O [t] in the time zone one unit before (t = ty−2 = 20: 00 to 21:00) is set. In this case, D [t]> B−L [t + 1], and the storage device discharge amount O [t] = B−L [t + 1] and the remaining amount L [t] = 0.
Therefore, in the time zone from 20:00 to 21:00, the remaining amount of charge that cannot be discharged in the 2 unit time zone (21:00 to 23:00) of the remaining power storage B is discharged. Set.

Therefore, in the first embodiment, the electric power charged in the storage battery 2 at night is discharged at 23:00 immediately before the charging start time as shown in FIG. There is little time to enter the state. Therefore, even if a power failure or the like occurs in a time zone other than this “empty” time zone, the power of the storage battery 2 can be used.
In addition, since discharging is performed from a time zone in which the power rate is relatively high, it is economically superior.

On the other hand, FIG. 7 shows an example in which a discharge plan is set in consideration of only a power charge in a time zone in which a discharge demand amount D [t] occurs. In this case, since the morning and evening charges are in the same middle price range, the storage battery 2 is discharged from the morning, and as shown in the figure, the storage battery 2 is fully discharged at 20:00 and is in an “empty” state. It becomes.
Therefore, when a power failure occurs after this, the storage battery 2 cannot be discharged, and the electric appliance cannot be used. In addition, even when a power failure occurs before the storage battery 2 becomes empty, the time during which the storage battery 2 can be discharged is shorter than in the first embodiment.

(Other usage examples)
Next, based on FIG. 8, FIG. 9, the usage example with an electric charge different from the above is demonstrated.
In this usage example, as shown in FIG. 8, two types of charges, a low price range and a high price range, are set as the electricity price. As shown in the figure, the low price range is set to 1:00 to 6:00. In addition, the high price range shows that the high price range is relatively higher than the low price range, and the charge is not necessarily the same as the high price range shown in FIG. It may be considerable.

  In this usage example, the discharge demand amount D in the time zone closer to the charge start time in the discharge demand amount D [t] existing in the high price range, which is a relatively high price of the two charges, as the discharge time. From [t], a time period until the total amount of electric power reaches the remaining charge B is selected.

The selection is the same as described above, and the amount of discharge of the power storage device is set to O [t] = discharge demand amount D [ty] in the time zone ty (ty = 0: 00 to 1: 0) closest to the charging start time. At the same time, the remaining amount L [ty] = D [ty] after discharging in a time zone having a higher priority than the time zone.
That is, the remaining power B in this time zone is the above setting because it is a full charge amount.

Next, the power storage device discharge amount O [t] in the time zone (t = ty−1 = 23: 00 to 0:00) before the discharge time is set. At this time, the remaining power B that can be discharged from the storage battery 2 is BD [ty], and D [t] <B−L [t + 1].
Therefore, the power storage device discharge amount O [t] = discharge demand amount D [ty−1] and the remaining amount L [t] = L [t + 1] + D [ty].

Next, the power storage device discharge amount O [t] in the time zone (t = ty−2 = 22: 0 to 23:00) before the discharge time is set. At this time, similarly to the above, the rechargeable remaining power B of the storage battery 2 has a relationship of D [t] <B−L [t + 1].
Therefore, the power storage device discharge amount O [t] = discharge demand amount D [t] and the remaining amount L [t] = L [t + 1] + D [t]. As a result of this discharge, the remaining amount of electricity B remains less than the upper limit discharge amount A.
Therefore, in the setting of the power storage device discharge amount O [t] in the time zone one unit before (t = ty−3 = 21: 00 to 22:00), D [t]> B−L [t + 1]. , Power storage device discharge amount O [t] = B−L [t + 1], and remaining amount L [t] = 0.

As a result of the above calculation, as shown in FIG. 9, in the high price range, the time zone from 21:00:00 to 1:00 closest to the charging start time (10:00) is set as the discharge time.
Therefore, even in this usage example, the time when the remaining amount B of the storage battery 2 runs out can be set as close to the charging start time as possible, and the time from when the remaining amount B remains until the start of charging can be set as short as possible. Sometimes, it is possible to secure a long time period during which power can be supplied.

In the case of the above-described comparative example, the morning discharge time is set from 6:00, and the discharge is started from the end when the storage battery discharge demand occurs in the evening. As indicated by the chain line, the discharge is terminated at 19:00.
For this reason, the time slot | zone when the storage battery 2 cannot be discharged at the time of a power failure becomes still longer.

(Effect of Embodiment 1)
The effects of the power control system according to the first embodiment will be described below.
1) The power control system of the embodiment
A power control system for controlling power supply to a house H1 (building) including a solar cell panel 1 (solar power generation device) and a storage battery 2 (power storage device),
A power generation prediction unit 62 and a power consumption prediction unit 61 that predict the power generation amount of the solar panel 1 and the power consumption amount of the house H1,
A power price database 53 (power price storage unit) for storing a power price for each time zone of the externally supplied power to the house H1,
A charge / discharge control unit 63 that controls charging and discharging of the storage battery 2 based on the predicted power consumption predicted value C [t] and the power generation predicted value S [t];
With
The charging / discharging control unit 63 sets the discharge time that is long enough to discharge the remaining power B of the storage battery 2 in a time zone in which the power consumption predicted value C [t] exceeds the power generation predicted value S [t]. A time close to the charging start time prior to the preset charging start time is preferentially set.
Therefore, the time when the remaining battery charge B of the storage battery 2 runs out can be set as close to the charging start time as possible, and the time from when the remaining battery charge B runs out to the start of charging can be set as short as possible. Long time zone can be secured.

2) The power control system of Embodiment 1
The charge / discharge control unit 63 sets the discharge time.
The time when the predicted power consumption predicted value C [t] exceeds the power generation predicted value S [t] is set as a discharge demand time zone in which the discharge demand amount of the storage battery 2 is generated,
Of the discharge demand time zones, first, the discharge demand time zone in which the power price is relatively high is prioritized and selected as the discharge time, and in the same price time zone, it is close to the charge start time. The discharge demand time zone is preferentially selected as the discharge time.
Therefore, it is possible to ensure the power supply performance at the time of a power failure while ensuring economic efficiency.

3) The power control system of Embodiment 1
The charge / discharge control unit 63 calculates the discharge demand amount D [t].
The predetermined unit time zone is t, the discharge demand amount is D [t], the power generation amount prediction value is S [t], the power consumption amount prediction value is C [t], and the upper limit of discharge per unit time zone of the storage battery 2 is possible. When the discharge amount is A, the discharge demand amount is obtained by calculation of D [t] = S [t] −C [t], and when the obtained discharge demand amount D [t] is negative, the discharge demand amount D [T] is set to 0, and when the obtained discharge demand amount D [t] exceeds the upper limit discharge amount A, the discharge demand amount D [t] is set as the upper limit discharge amount A.
Therefore, an appropriate discharge time can be set according to the discharge capacity of the storage battery 2.

4) The power control system of Embodiment 1
The charge / discharge control unit 63 sets the discharge time and the discharge amount.
In a continuous time zone with the same price, t is a predetermined unit time, O [t] is the amount of discharge of the power storage device, B is the remaining power storage time of the same price zone, and B is the high priority time zone of the remaining power charge B. L [t] is the remaining amount after the discharge is performed, and calculation is performed retroactively for each time period from the time period close to the charging start time,
In the time zone ty immediately before the charging start time,
When D [ty] <B, O [ty] = D [ty], L [ty] = D [ty]
When D [ty] <B, O [ty] = B, L [ty] = 0,
In a time zone t that goes back a predetermined unit (1 hour) from the time zone ty,
When D [t] <B−L [t + 1], O [t] = D [t], L [t] = L [t + 1] + D [t],
When D [t] <B−L [t + 1] is not satisfied, O [t] = B−L [t + 1] and L [t] = 0.
Therefore, it is easy to calculate the discharge time setting, and the discharge time can be set by processing with a light calculation load.

5) The power control method of Embodiment 1 is
The power generation amount of the solar cell panel 1 of the house H1 including the solar battery panel 1 and the storage battery 2 and the power consumption amount of the house H1 are predicted, and the power consumption prediction value C [t] and the power generation prediction value S [t] Is a power control method for controlling the charging and discharging of the storage battery 2,
In setting the discharge time of the length that can discharge the remaining power of the storage battery 2,
A time period in which the predicted power consumption C [t] exceeds the predicted power generation value S [t] and a discharge demand amount of the storage battery 2 occurs is set as a discharge demand time period;
Of the discharge demand time zones, first, the discharge demand time zone in which the power price is relatively high is prioritized and selected as the discharge time, and in the same price time zone, it is close to the charge start time. A step of giving priority to a discharge demand time zone and selecting it as a discharge time;
It is characterized by providing.
Therefore, when setting the discharge time, first, a discharge demand time zone with a high power price is set as the discharge time, and further, in the same power price zone, a time zone close to the charge start time is set. Thereby, it becomes possible to ensure the power supply performance at the time of a power failure while securing the economy.

  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 embodiment, an example has been described in which the present invention is applied to a charge system in which three types of power prices exist in one day and two charge systems, but the charge system is not limited to these. The power price and the switching time described in the embodiment are examples, and the time when the power price changes and the number of time zones where the price is different are the management policy of the company supplying the grid power, such as the power company, and the policy at that time It changes by things.
Further, in the embodiment, the example in which the unit for setting each time slot is 1 hour has been shown, but the present invention is not limited to this, and the unit is a time of 1 hour or more, or 30 minutes or 15 minutes or less. Also good.

Moreover, although the example which implements invention in a management server was shown in embodiment, you may implement in the controller of each building.
Alternatively, the case where the determination result of the discharge start time transmitted via the communication unit of the management server is displayed on the display monitor has been described. However, the present invention is not limited to this. It can also be displayed on the screen. The resident can also know the determination result by browsing a predetermined Web page.

  Furthermore, in the embodiment, an example of performing prediction based on a measurement value measured by a home measurement device is shown, but the present invention is not limited to this, and an average value obtained from existing statistical materials, etc. It can also be a predicted value.

Further, in the embodiment, an example in which the charging time zone is set to the time zone (nighttime) with the lowest power price is shown, but the charging time zone is not limited to this. For example, when the power generation amount on the next day exceeds the power consumption amount, the charging time zone may be set in the daytime so as to be charged by power generation. Therefore, in this case, the discharge time is set to a time zone including morning.
Furthermore, in the embodiment, in the setting of the discharge time, first, an example is given in which priority is given to a time zone in which the power price is high. However, the present invention is not limited thereto, and at least a time close to the charging start time regardless of the power price. Should be set with priority. That is, it is good also as a setting which gives top priority to the power supply at the time of a power failure rather than economical efficiency. In addition, it is preferable that the user can arbitrarily set the selection of whether to give priority to the power supply at the time of power failure without considering the economy or considering the economy.
The length of the discharge time and the charge time is defined by the charge / discharge performance per unit time of the power storage device, and the length is not limited to the length shown in the embodiment. . Note that as the power storage device, in addition to the storage battery described in the embodiment, other devices such as a capacitor can be used.

1 Solar panel (photovoltaic generator)
2 Storage battery (power storage device)
6 Control Unit 53 Power Price Database 61 Power Consumption Prediction Unit 62 Generated Power Prediction Unit 63 Charge / Discharge Control Unit A Upper Limit Amount of Discharge B Power Storage Remaining C [t] Power Consumption Predicted Value D [t] Discharge Demand Amount H1,.・, HX Housing (building)
L [t] Remaining amount O [t] Power storage device discharge amount S [t] Power generation amount predicted value

Claims (5)

A power control system for controlling power supply to a building including a solar power generation device and a power storage device,
A prediction unit for predicting the power generation amount of the solar power generation device and the power consumption amount of the building;
A power price storage unit that stores a power price for each time zone of externally supplied power to the building;
A charge / discharge control unit that controls charging and discharging of the power storage device based on the predicted power consumption and the power generation amount;
With
The charging / discharging control unit is configured to set a charging time set in advance in a time zone in which the predicted power consumption exceeds the predicted power generation amount in setting a discharge time of a length capable of discharging the remaining amount of power stored in the power storage device. A power control system characterized by preferentially setting a time close to the charging start time before the start time. The power control system according to claim 1,
The charge / discharge control unit sets the discharge time,
The time when the predicted power consumption exceeds the predicted power generation amount is set as a discharge demand time zone in which the discharge demand amount of the power storage device is generated,
Among the discharge demand time zones, first, the discharge demand time zone in which the power price is present in a relatively high price time zone is preferentially selected as the discharge time, and further in the time zone at the same price. The power control system is characterized in that the discharge demand time zone close to the charge start time is preferentially selected as the discharge time. The power control system according to claim 2, wherein
The charge / discharge control unit determines the demand for discharge.
T is a predetermined unit time zone, the discharge demand is D [t], the predicted power generation value is S [t], the predicted power consumption amount is C [t], and discharge is possible per unit time zone of the power storage device. When the upper limit discharge amount is A, the discharge demand amount is obtained by calculation of D [t] = S [t] −C [t], and when the obtained discharge demand amount D [t] is negative, When the discharge demand amount D [t] is 0 and the obtained discharge demand amount D [t] exceeds the upper limit discharge amount A, the discharge demand amount D [t] is set as the upper limit discharge amount A. A power control system characterized by: The power control system according to claim 2 or claim 3,
The charge / discharge control unit sets the discharge time and the discharge amount,
In a continuous time zone with the same price, t is a predetermined unit time, O [t] is the amount of discharge of the power storage device, B is the remaining power storage time of the same price zone, and B is the high priority time zone of the remaining power charge B. L [t] is the remaining amount after the discharge is performed, and the calculation is performed retroactively for each time period from the time period close to the charging start time,
In the time zone ty immediately before the charging start time,
When D [ty] <B, O [ty] = D [ty], L [ty] = D [ty]
When D [ty] <B, O [ty] = B, L [ty] = 0,
In a time zone t that goes back the time zone of the predetermined unit from the time zone ty,
When D [t] <B−L [t + 1], O [t] = D [t], L [t] = L [t + 1] + D [t],
When D [t] <B−L [t + 1] is not satisfied, O [t] = B−L [t + 1] and L [t] = 0. A power generation amount of the solar power generation device and a power consumption amount of the building of a building including the solar power generation device and the power storage device are predicted, and based on the predicted power consumption amount and the power generation amount, A power control method for controlling charging and discharging,
In setting the discharge time of a length capable of discharging the remaining amount of electricity stored in the power storage device,
A step of setting a time zone in which the predicted power consumption exceeds the predicted power generation amount and a discharge demand amount of the power storage device occurs as a discharge demand time zone;
First, the discharge demand time zone in which the power price is present in a relatively high price time period is selected as the discharge time in the discharge demand time zone, and charging is started in the same price time zone. Preferentially selecting the discharge demand time zone close to the time as the discharge time;
A power control method comprising: