JP6680606B2 - Power control system and power control method - Google Patents

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.

BACKGROUND ART Conventionally, in a power control system of a house equipped with a solar power generation device and a power storage device, there is known a power control system that sets a charging / discharging schedule so that the dischargeable capacity of the power storage device can be effectively used while ensuring economy. (See Patent Document 1).
This conventional technology is a prediction means for predicting the amount of power generation and power consumption of a solar cell panel, a power price database in which the switching time of the power price is stored, and the discharge start time is determined based on the power price, power consumption, etc. And a discharge start time determining means for performing the discharge start time determination. By properly setting the discharge start time, it is possible to effectively utilize the power storage device with a small calculation load while ensuring economy.

Japanese Patent No. 5484621

  However, in the above-described conventional technique, the discharge start time is set only on the basis of economy, and thus the remaining amount of electricity stored in the power storage device may run out in a relatively early time. Therefore, when a power failure occurs due to a disaster or the like, there is a possibility that the power storage device cannot hold sufficient power.

  Therefore, 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 comprises:
A power control system for controlling the supply of power to a building including a solar power generation device and a power storage device,
A prediction unit that predicts 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 period 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 amount and the power generation amount,
Equipped with
The charging / discharging control unit, when setting a discharging time of a length capable of discharging the remaining amount of power stored in the power storage device, performs a preset charging in a time zone in which the predicted power consumption exceeds the predicted power generation. It is characterized in that a time earlier than the start time and closer to the charging start time is preferentially set.

Incidentally, the charge and discharge control unit, in setting the discharge time,
A time period in which 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 occurs,
Of the discharge demand time zones, first, the discharge demand time zone in which the electric power price exists in a relatively high price zone is preferentially selected as the discharge time, and further in the time zone of the same price. It is preferable to preferentially select the discharge demand time zone close to the charge start time as the discharge time.
Further, the charge and discharge control unit, in determining the discharge demand amount,
The predetermined unit time period is t, the discharge demand amount is D [t], the power generation amount predicted value is S [t], the power consumption amount predicted value is C [t], and the power storage device can be discharged per unit time period. If the upper limit discharge amount is A, the discharge demand amount is obtained by the calculation of D [t] = S [t] −C [t], and if the obtained discharge demand amount D [t] is negative, When the discharge demand amount D [t] is 0 and the calculated 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. Preferably.
Furthermore, the charge / discharge control unit sets the discharge time and the discharge amount,
In a continuous time period of the same price, a predetermined unit time period is t, a power storage device discharge amount is O [t], a power storage remaining amount of the same price time period is B, and a power storage remaining amount B is a high priority time period. The remaining amount after the discharge is performed is L [t], and calculation is performed retroactively for each time zone from the time zone 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], and
When D [ty] <B, O [ty] = B and L [ty] = 0 are set.
In the time zone t, which is the time zone of the predetermined unit traced back 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 to set 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 is
A power generation amount of the solar power generation device and a power consumption amount of the building of a building including a solar power generation device and a power storage device are predicted, and based on the predicted power consumption amount and the power generation amount, the power storage device A power control method for controlling charging and discharging, comprising:
In setting the discharge time of the length that can discharge the remaining charge of the power storage device,
Setting the time zone in which the predicted power consumption amount exceeds the predicted power generation amount and the discharge demand amount of the power storage device occurs as a discharge demand time period,
Of the discharge demand time zones, first, the discharge demand time zone existing in a time zone in which the power price is relatively high is preferentially selected as the discharge time, and charging is started in the time zone of the same price. A step of preferentially selecting the discharge demand time zone close to time as the discharge time;
It is characterized by including.

  In the power control system of the present invention, since the discharge time is set prior to the charge start time and the time close to the charge start time, the time from the time when the remaining charge is exhausted to the start of charge is set as short as possible. Therefore, it is possible to secure a long time period during which power can be supplied during a power failure.

Further, in setting the discharge time, among the discharge demand time zones, first, the one with a high power price is given priority, and further the one close to the charge start time in the time zone of the same price is selected with priority. It is possible to secure the power supply performance during a power failure while securing the economical efficiency.
When the discharge demand amount D [t] exceeds the upper limit discharge amount A, if the discharge demand amount D [t] is set as the upper limit discharge amount A, 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 discharging over A.
Therefore, it is possible to set an appropriate discharge time according to the discharge capacity of the power storage device.

  Further, the discharge time is divided into a discharge demand amount D [t], a power storage device discharge amount O [t], a power storage remaining amount B from the power storage device in a time zone of the same price, and a remaining amount L [t] after discharging. In the case of setting the discharge time by comparison, the calculation of the discharge time setting is easy, and the discharge time can be set by the processing with a light calculation load.

Further, in the power control method of the present invention, in setting the discharge time, first, the power demand is set as a discharge demand time zone of high price, and further, in the same power price zone, a time zone close to the charging start time. I set it to.
Therefore, it becomes possible to secure the power supply performance during a power failure while securing the economical 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 power control system of Embodiment 1 in detail. FIG. 3 is an electric power price explanatory diagram schematically showing an electric power price system in the electric power control system of the first embodiment. 5 is a flowchart showing a flow of processing for predicting power consumption in the power control system according to the first embodiment. 6 is a flowchart showing a flow of processing for setting a discharge amount and a discharge time and executing charging / discharging in the power control system of the first embodiment. 5 is a time chart showing an example of setting a predicted value of power consumption, a predicted value of power generation and a predicted value of discharge, and a set amount of discharge and a discharge time in an operation example of the power control system according to the first embodiment. 5 is a time chart showing an example of setting a predicted value of power consumption, a predicted value of power generation and a predicted value of discharge, and a set amount of discharge and a discharge time in an operation example of a comparative example with the first embodiment. FIG. 9 is an electric power price explanatory diagram schematically showing another electric power price system to which the electric power control system of the first embodiment is applied. Changes in the power consumption amount predicted value, the power generation amount predicted value, and the discharge demand amount in the operation example when the power control system according to the first embodiment is applied to the power price system shown in FIG. 8, and the discharge amount and the discharge time setting example. 2 is a time chart showing.

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 grids for receiving power from grid power such as a power plant of a power company or a cogeneration facility installed in each region. As is connected to the grid.

  Further, these houses H1, ... Include 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 arithmetic processing results and transmission / reception of control signals are performed with the external management server 5 also connected to the communication network N. In the following description, as the houses H1, ..., the house H1 is representatively shown.

  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 a house side and a structure arranged in the management server 5 as a server side.

First, the configuration of the house H1 to be processed will be described.
The house H1 includes a solar cell panel 1, a storage battery 2, a measuring device 3 for measuring the hourly power generation amount of the solar cell panel 1 and the hourly power consumption of the house H1, and a display monitor 4 as a display device. Mostly equipped.

The solar cell panel 1 is a device that converts sunlight into electric power by using a solar cell to generate electric power.
The solar cell panel 1 is a device that can supply electric power only during a time period when it can receive sunlight. In addition, the DC power generated by the solar cell panel 1 is usually used after being converted into AC power by a power conditioner (not shown). The specifications such as the capacity of the power generation amount of the solar cell panel 1 installed in the house H1 are stored in the later-described residence information database 51 on the management server 5 side.

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

  Further, the house H1 is provided with various loads that are supplied with external electric power through the distribution board and consume the external electric power. 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 electric appliance such as a refrigerator and a television.

  An electric vehicle or a plug-in hybrid vehicle (not shown) serves as a load when charging for traveling, and serves as a power storage device like the storage battery 2 when discharging due to 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. The measurement 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 for each time at an arbitrary interval such as a unit of seconds, a unit of minutes, a unit of time, or the like. Then, the data of the measurement value measured by the measuring device 3 is stored in the power consumption history database 52, which will be described later, on 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 weather conditions such as temperature. The power consumption and the power consumption are stored in categories according to loads.

  The display monitor 4 displays the measurement 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. As the display monitor 4, a dedicated terminal monitor may be used, or a screen of a general-purpose device such as a personal computer may be used.

Next, the configuration of 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, and driving. A pattern database 55 is provided.

  The communication unit 71 sends the specifications, measured values, processing requests, etc. 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, 55. It also has a function of sending the data, the calculation processing result performed by the control unit 6, the update program, and the like to the house H1.

  The house information database 51 includes house codes (identification numbers) of the houses H1, ..., HX, addresses associated with the house codes, year of construction, heat insulation performance, floor plan, electric wiring, used members, and solar cell panels. Information such as specifications 1 (power generation capacity) and specifications of storage battery 2 (storage capacity, rated output) is stored.

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

  Further, the history of power consumption stored in the power consumption history database 52 is, as described above, the power consumption of the air conditioning load such as the air conditioner and the hot water supply load such as the hot water supply which are easily affected by the weather conditions such as the temperature. , And the power consumption of other loads that are less likely to be affected by weather conditions such as temperature, are stored in categories by load.

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

  For example, as shown in FIG. 3, in the charge system according to this embodiment, the mid-price range in the morning from 7:00 to 10:00 and the high price range in the daytime from 10:00 to 17:00, There are three types of power price ranges, a mid-price range from 12:00 to 23:00 and a low price range from 23:00 to 7am the next day before night.

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

  In the weather forecast database 54, the weather of the next day such as the temperature and the amount of insolation of each of the houses H1, ..., HX where the houses H1, ... 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 the air conditioning load and the hot water supply that is the hot water supply load installed in the houses H1, ..., HX correspond to the weather forecast data. It is attached and remembered.

  The control unit 6 is provided with 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 means for predicting the power consumption amount for each unit time (in the first embodiment, one hour is set as the unit time). For example, the hourly power consumption of the house H1 on the following day can be predicted. The power consumption predicting unit 61 predicts the power consumption per hour of the air conditioning load and the hot water supply load that 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 per hour of other difficult loads is predicted based on past history data, and these are summed up to predict the power consumption per hour of the house H1.

  Specifically, in predicting the hourly power consumption 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), and corresponding measures are taken. Referring to the operation pattern data (step S1B in FIG. 4), the power consumption prediction unit 61 predicts the amount of power consumption for each time (step S2 in FIG. 4). In predicting the power consumption of other loads over time, the past power consumption history database 52 classifies and stores the past history data (FIG. 4 step S1C), and the power consumption prediction unit 61 determines the time. The power consumption for each is predicted (step S2 in FIG. 4). Then, these are summed up to predict the hourly power consumption of the house H1 (step S2 in FIG. 4).

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

  On the other hand, the dischargeable electric energy of the storage battery 2 can be set as the set dischargeable electric energy. For example, it is known that the life is shortened when all the electric power stored in the storage battery 2 is used up. Therefore, 97% of the full charge amount is set as the settable dischargeable electric power, or 70% in case of a sudden power failure. Can be used as the set dischargeable electric energy. In this way, the set dischargeable electric energy is the remaining dischargeable amount in the storage battery 2, and this is referred to as the remaining charge amount.

  Then, the charging / discharging of the storage battery 2 is controlled based on the predicted power consumption amount 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 controller 6 will be described based on the flowchart of FIG.
In step S101, the generated power prediction section 62 calculates a predicted value of power generation by the solar cell panel 1 for each time zone, and proceeds to the next step S102. As shown in FIG. 6, for example, the predicted value of power generation is a positive value in the sunshine hours and is 0 at night.
Returning to FIG. 5, in step S102, the 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 shown in FIG. 6, the predicted value of power consumption is low during the day when the resident is absent, and is particularly high during the night when the resident is at home. In addition, at night, since the heat of the hot water supply device is stored and the storage battery 2 to be described later is charged by using inexpensive power, the predicted value of power consumption increases.

Returning to FIG. 5, in step S103, the charge / discharge control unit 63 calculates the discharge demand amount (D [t]) from the storage battery 2 for each time zone based on the power generation amount predicted value and the power consumption amount predicted value. , And proceeds to the next step S104. This discharge demand is the power demand that exceeds the power generation in the building.
Here, the discharge demand amount (D [t]) is obtained by the following equation (1).
D [t] = S [t] -C [t] (1)
However, if D [t] <0, D [t] = 0, and if D [t]> A, D [t] = A.
In addition, t is a time zone of 1 hour unit, S [t] is a predicted value of power generation amount, C [t] is a predicted value of power consumption, and A is an upper limit of discharge of the storage battery 2 per unit time (1 hour). The value is the upper limit discharge amount.

That is, if the predicted power generation amount S [t] exceeds the predicted power consumption amount C [t], it is determined that 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 it exceeds the value S [t], it is assumed that there is a discharge demand from the storage battery 2, and the difference between them is the 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] occurs during a time period 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 S104, the charge / discharge amount of the storage battery 2 for each time zone is calculated.
Here, first, the charge amount and the charge time period are calculated.
The charging time period is set to a time period when the power price is the lowest (night), and an earlier time period in the cheap time (night). Therefore, in the first embodiment, the charging time is set to a time zone after 23:00, and preferably the charging start time is set to 23:00. Further, in the first embodiment, the time required for the battery 2 to be fully charged from the state in which all the remaining chargeable amount B of the storage battery 2 is discharged is set to about 3.5 hours. It is preferable to set the time around 23:00 to 02:30, but in consideration of other power demands, the total demanded amount is suppressed to a certain degree and the optimum time zone is set.

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

  Further, when a plurality of discharge demand time zones exist in the same price zone, a time zone prior to the charge start time and closer to the charge start time is preferentially set. Then, when a plurality of unit time zones are included in this time zone, the discharge time and the power storage device discharge amount O [t] are calculated as follows by going back from the time zone close to the charging start time for each unit time zone. . It should be noted that B is the remaining amount of electricity stored in the storage battery 2 in a plurality of continuous unit time zones, and L [t] is the amount of remaining electricity in the remaining electricity amount B of the storage battery 2 that has a higher priority than the relevant time zone. It is the remaining amount.

  Here, when a plurality of continuous time zones are set to tx to ty (tx <ty), first, in a 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 is not satisfied, O [ty] = B and L [ty] = 0 are set.

Next, in the time zone ty-1 = t immediately before the time zone ty (low in one-step priority order), if D [t] <BL [t + 1], then O [t] = D [ t] and L [t] = L [t + 1] + D [t].
On the other hand, when D [t] <B-L [t + 1] is not satisfied, O [t] = B-L [t + 1] and L [t] = 0 are set.

Returning to FIG. 5, in step S105 following step S104, an operation plan (operation schedule) is created based on the charge amount and the power storage device discharge amount O [t] for each time period calculated in step S104, and then step S106. Proceed to.
Then, 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. 6 and 7.
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 charging / discharging operation plan creation process of the present invention is not performed under the same conditions as the operation example of FIG.

The control unit 6 in the power control system of the first embodiment creates an operation plan (operation schedule) on the day before the day on which the operation plan is created.
In creating the operation plan, first, the power generation prediction unit 62 of the control unit 6 calculates the predicted power generation amount S [t] based on the weather forecast (clear weather) of the next day (step S101). The predicted value S [t] of power generation (indicated by the alternate long and short dash line) in the operation example of FIGS. 6 and 7 rises at about 7:00, reaches a peak value at about 11:00, and then becomes 0 at about 16:00. It is a value that rises in the vicinity.

  Next, the power consumption prediction unit 61 of the control unit 6 creates a power consumption amount prediction value C [t] in the house H1 for each unit time (1 hour) (step S102). The predicted value C [t] of power consumption becomes a low value during the period from 7:00 to 16:00 when the resident is absent, as shown by the dotted line in FIGS. 6 and 7. In addition, the predicted value of power consumption is Yamagata that peaks around 20:00 at 16:00 to 23:00 on the evening when the resident returns home and goes to bed. Furthermore, the estimated power consumption amount C [t] is set to charge the storage battery 2 or store heat in the hot water supply device at 10:00 to 5:00 at night when the charge is low 3: Yamagata has a peak around 00.

  Therefore, when the predicted value C [t] of power consumption exceeds the predicted value S [t] of power generation, 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 power consumption amount predicted value C [t] and the power generation amount predicted value S [t]. [T] is calculated (step S103).

  In FIG. 6 and FIG. 7, the calculated discharge demand amount D [t] is shown by a bar graph on an hourly basis. The discharge demand amount D [t] is limited by the upper limit discharge amount A of the dischargeable electric 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 for each time (step S104). In calculating the charge / discharge amount, the charging time period and the charging amount are set, and in FIGS. 6 and 7, the charging time period and the charging amount are shown in black.

  In the first embodiment, as the charging time period, the charging start time is set in advance at midnight (night) after 23:00 when the unit price of electricity is the lowest. Further, as will be described later, in the present control, the entire amount of the remaining charge (settable dischargeable electric energy) of the storage battery 2 is discharged before the charging is started, and the so-called “empty” state is set. The charging end time is also set in advance from the chargeable amount per hour and the charge amount of the storage battery 2. In this operation example, the charging start time is 1:00 and the charging end time is about 4:30 as illustrated.

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

Since the discharge demand amount D [t] set in the above high price range is less than the remaining battery charge amount B, the discharge demand amount D [t] is present 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 a time period during which the power storage device is discharged. In setting the discharge time in the mid-price range in the morning and evening, in the first embodiment, the discharge is set before the charge start time and close to the charge start time, that is, at the latest possible time.
Therefore, in the first embodiment, in the evening (17:00 to 23:00), the discharge time is set from the 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) that is the closest to the charge time zone in the medium price range. The amount is set to 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.
In other words, since the remaining charge amount B in this evening time zone is close to the full charge amount, the above setting is made. The full charge amount (total amount of electric power that can be discharged by the storage battery 2) is set to a value 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: 00 to 22:00) before the above-described discharge time is set. At this point, the remaining chargeable amount B of the storage battery 2 is about twice the maximum value of the discharge demand amount D [t], and has a relationship of D [t] <B−L [t + 1]. Has become.
Therefore, the power storage device discharge amount O [t] = discharge demand amount D [ty] and the remaining amount L [ty] = L [t + 1] + D [t]. Note that the discharge demand amount D [t] is slightly lower than the upper limit discharge amount A at 21:00 to 22:00.

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

Therefore, in the first embodiment, as shown in FIG. 6, the electric power charged in the storage battery 2 at night is completely discharged at 23:00 immediately before the charging start time, and the storage battery 2 cannot be discharged. The time to reach the state is short. Therefore, even if a power outage occurs in a time zone other than the "empty" time zone, the power of the storage battery 2 can be used.
In addition, the discharging is economically excellent because the discharging is performed from a time period when the electricity charge is relatively high.

On the other hand, FIG. 7 shows an example in which the discharge plan is set only in consideration of the electricity rate during the time period when the discharge demand amount D [t] is generated. In this case, since the charges for the morning and the evening are in the same mid-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. Becomes
Therefore, if a power failure occurs after that, the storage battery 2 cannot be discharged, and the electric appliance cannot be used. Further, even if a power failure occurs before the storage battery 2 becomes empty, the time during which the storage battery 2 can be discharged becomes shorter than that in the first embodiment.

(Other usage examples)
Next, based on FIG. 8 and FIG. 9, an example of use with an electric charge different from the above will be described.
In this usage example, as shown in FIG. 8, two types of charges, a low price band and a high price band, are set as the electricity charges. In addition, as shown in the figure, the low price range is set to 1:00:00 to 6:00. Also, the high price range charge is relatively high compared to 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 example of use, as the discharge time, in the discharge demand amount D [t] existing in the high price range, which is a relatively high price of two types of charges, the discharge demand amount D in the time period close to the charging start time A time period from [t] until the total amount of electric power reaches the remaining charge B is selected.

The selection is similar to that described above, and in the time zone ty (ty = 0: 00 to 1:00) closest to the charging start time, the discharge amount of the power storage device is O [t] = discharge demand amount D [ty]. At the same time, it is assumed that 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 charge amount B in this time period is the full charge amount, the above setting is made.

Next, the power storage device discharge amount O [t] in the time period (t = ty−1 = 23: 00: 00) before the above-described discharge time is set. At this point, the remaining chargeable amount B of the storage battery 2 is B-D [ty], which has a relationship of D [t] <B-L [t + 1].
Therefore, the storage device discharge amount O [t] = discharge demand amount D [ty−1] and the remaining amount L [t] = L [t + 1] + D [ty] are set.

Next, the power storage device discharge amount O [t] in the time zone (t = ty−2 = 22: 00 to 23:00) before the above-described discharge time is set. At this time as well, similarly to the above, the remaining chargeable amount 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] are set. As a result of this discharge, the remaining charge B remains below the upper limit charge A.
Therefore, when the storage device discharge amount O [t] in the time zone (t = ty−3 = 21: 00 to 22:00) one unit before is set, D [t]> B−L [t + 1] is set. , The power storage device discharge amount O [t] = B−L [t + 1], and the remaining amount L [t] = 0.

As a result of the above calculation, as shown in FIG. 9, the time zone from 21:00 to 1:00 closest to the charging start time (1:00) in the high price zone is set as the discharge time.
Therefore, also in this usage example, the time when the remaining charge B of the storage battery 2 is exhausted can be set to a time zone as close as possible to the charging start time, and the time from when the remaining charge B of the storage battery 2 is exhausted to the start of charging can be set as short as possible. At times, it is possible to secure a long time period in which power can be supplied.

In the case of the comparative example described above, the discharge time in the morning is set from 6:00, and the discharge is performed from the end of the evening when the storage battery discharge demand amount is generated. The discharge ends at 19:00 as indicated by the chain line.
For this reason, the time period during which the storage battery 2 cannot be discharged during a power failure becomes even 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 is
A power control system for controlling power supply to a house H1 (building) including a solar cell panel 1 (photovoltaic power generator) and a storage battery 2 (power storage device),
A power generation predicting unit 62 and a power consumption predicting unit 61 that predict the power generation amount of the solar cell panel 1 and the power consumption amount of the house H1;
An electric power price database 53 (electric power price storage unit) that stores the electric power price of the externally supplied electric power to the house H1 for each time period;
A charge / discharge control unit 63 that controls charging and discharging of the storage battery 2 based on the predicted power consumption amount predicted value C [t] and the generated power amount predicted value S [t];
Equipped with
The charging / discharging control unit 63 sets the discharge time of a length capable of discharging the remaining charge B of the storage battery 2 in a time period in which the predicted power consumption amount C [t] exceeds the predicted power generation amount S [t]. In addition, it is characterized in that a time earlier than the preset charging start time and closer to the charging start time is preferentially set.
Therefore, the time when the remaining charge B of the storage battery 2 is exhausted can be set to a time zone as close to the charging start time as possible, and the time from when the remaining charge B of the storage battery 2 is exhausted to the start of charging can be set as short as possible, and power can be supplied during a power failure. You can secure a long time zone.

2) The power control system according to the first embodiment is
The charge / discharge control unit 63 sets the discharge time by
The time when the predicted power consumption amount predicted value C [t] exceeds the power generation amount predicted value S [t] is set as the discharge demand time zone in which the discharge demand amount of the storage battery 2 occurs,
Of the discharge demand time zones, first, the discharge demand time zone existing in the time zone where the power price is relatively high is prioritized and selected as the discharge time, and further, in the time zone of the same price, it is close to the charging start time. The discharge demand time zone is preferentially selected as the discharge time.
Therefore, it becomes possible to secure the power supply performance during a power failure while securing the economical efficiency.

3) The power control system according to the first embodiment is
The charge / discharge control unit 63 calculates the discharge demand amount D [t] by
The predetermined unit time period is t, the discharge demand amount is D [t], the power generation amount predicted value is S [t], the power consumption amount predicted value is C [t], and the dischargeable upper limit of the storage battery 2 per unit time period When the discharge amount is A, the discharge demand amount is obtained by the calculation of D [t] = S [t] −C [t]. Further, when the obtained discharge demand amount D [t] is negative, the discharge demand amount D When [t] is set to 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.
Therefore, it is possible to set an appropriate discharge time according to the discharge capacity of the storage battery 2.

4) The power control system according to the first embodiment is
The charge / discharge control unit 63 sets the discharge time and the discharge amount,
In a continuous time period of the same price, a predetermined unit time period is t, a power storage device discharge amount is O [t], a power storage remaining amount of the same price time period is B, and a power storage remaining amount B is a high priority time period. The remaining amount after the discharge is performed is L [t], and the calculation is performed retroactively for each time zone from the time zone near the charge 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], and
When D [ty] <B, O [ty] = B and L [ty] = 0 are set.
In the time zone t, which is a predetermined unit (1 hour) time zone 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], other than O [t] = B-L [t + 1] and L [t] = 0.
Therefore, the calculation of the setting of the discharge time is easy, and the discharge time can be set by the processing with a light calculation load.

5) The power control method according to the first embodiment is
The power generation amount of the solar cell panel 1 and the power consumption amount of the house H1 of the house H1 including the solar cell panel 1 and the storage battery 2 are predicted, and the power consumption amount predicted value C [t] and the power generation amount predicted value S [t] are calculated. A power control method for controlling charging and discharging of the storage battery 2 based on
When setting the discharge time of the length that can discharge the remaining charge of the storage battery 2,
A step of setting a time zone in which the predicted value C [t] of power consumption exceeds the predicted value S [t] of power generation and a demand for discharge of the storage battery 2 occurs as a demand time zone for discharge;
Of the discharge demand time zones, first, the discharge demand time zone existing in the time zone where the power price is relatively high is prioritized and selected as the discharge time, and further, in the time zone of the same price, it is close to the charging start time. Selecting the discharge demand time zone as the discharge time with priority,
It is characterized by including.
Therefore, in setting the discharge time, first, the discharge demand time zone having a high power price is set as the discharge time, and further, in the same power price zone, it is set to a time zone close to the charging start time. As a result, it becomes possible to secure the power supply performance during a power failure while securing the economical efficiency.

  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 a design change that does not depart from the gist of the present invention is Included in the invention.

For example, in the embodiment, an example has been described in which the present invention is applied to a tariff system in which three types of power prices exist in one day and two types of tariff systems, but the tariff system is not limited to these. The power price and the switching time described in the embodiments are examples, and the time when the power price changes and the number of time zones where the prices are different are the management policy of a company that supplies system power such as an electric power company and the policy at that time. It changes depending on the situation.
In addition, in the embodiment, an example in which each time zone is set to one hour has been shown, but the present invention is not limited to this, and a unit of time is one hour or more, or 30 minutes, 15 minutes or less. Good.

Further, in the embodiment, the example in which the invention is implemented in the management server is shown, but the invention may be implemented in the controller of each building.
Alternatively, the case where the discharge start time determination result transmitted via the communication unit of the management server is displayed on the display monitor has been described, but the present invention is not limited to this, and the discharge start time is not limited to this. It can also be displayed on the screen. In addition, the resident can know the determination result by browsing a predetermined Web page.

  Further, in the embodiment, an example in which prediction is performed based on the measurement value measured by the measuring device of the house has been shown, but the present invention is not limited to this, and an average value obtained from existing statistical data etc. It can also be a predicted value.

Further, in the embodiment, the example in which the charging time period is set to the time period (night) at which the power price is the lowest is shown, but the charging time period is not limited to this. For example, when the amount of power generation on the next day exceeds the amount of power consumption, the charging time zone may be set during the day so that the battery is charged by power generation. Therefore, in this case, the discharge time is set to a time period including morning.
Further, in the embodiment, in setting the discharge time, first, an example is shown in which a time period in which the power price is high is prioritized, but the present invention is not limited to this, and regardless of the power price, at least a time close to the charging start time is set. Should be set with priority. That is, the power supply during a power failure may be set as the highest priority over the economical efficiency. In addition, it is preferable that the user can arbitrarily set the selection of whether to consider the economic efficiency or to prioritize the power supply during the power failure without considering the economic efficiency.
Further, the lengths of the discharge time and the charge time are specified by the charge / discharge performance per unit time of the power storage device, and the lengths are not limited to the lengths shown in the embodiment. . Note that as the power storage device, other than the storage battery described in the above embodiment, another device such as a capacitor can be used.

1 Solar panel (solar power generator)
2 Storage battery (power storage device)
6 Control unit 53 Electric power price database 61 Power consumption prediction unit 62 Power generation power prediction unit 63 Charge / discharge control unit A Upper limit discharge amount B Storage remaining amount C [t] Power consumption amount predicted value D [t] Discharge demand amount H1, ... ., HX housing (building)
L [t] Remaining amount O [t] Electric storage device discharge amount S [t] Power generation amount predicted value

Claims (2)

A power control system for controlling the supply of power to a building including a solar power generation device and a power storage device,
A prediction unit that predicts 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 period 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 amount and the power generation amount,
Equipped with
The charging / discharging control unit sets a discharging time of a length capable of discharging the remaining charge of the power storage device,
In the time zone in which the predicted power consumption exceeds the predicted power generation amount, priority is set to a time close to the charging start time before the preset charging start time ,
Further, a time period in which 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 occurs,
Of the discharge demand time zones, first, the discharge demand time zone in which the electric power price exists in a relatively high price zone is preferentially selected as the discharge time, and further in the time zone of the same price. The discharge demand time zone close to the charge start time is selected as the discharge time with priority,
Then, the charge / discharge control unit sets the discharge time and the discharge amount,
In a continuous time period of the same price, a predetermined unit time period is t, a power storage device discharge amount is O [t], a power storage remaining amount of the same price time period is B, and a power storage remaining amount B is a high priority time period. , L [t] is the remaining amount after the discharge is performed, and D [t] is the discharge demand amount, and the calculation is performed retroactively for each time period from the time zone 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], and
When D [ty] <B, O [ty] = B and L [ty] = 0 are set.
In the time zone t, which is the time zone of the predetermined unit traced back from the time zone ty,
When D [t] <B−L [t + 1], O [t] = D [t], L [t] = L [t + 1] + D [t],
A power control system characterized in that O [t] = B−L [t + 1] and L [t] = 0 except when D [t] <B−L [t + 1] . The power control system according to claim 1 ,
The charge / discharge control unit determines the discharge demand amount,
The predetermined unit time period is t, the discharge demand amount is D [t], the power generation amount predicted value is S [t], the power consumption amount predicted value is C [t], and the power storage device can be discharged per unit time period. If the upper limit discharge amount is A, the discharge demand amount is obtained by the calculation of D [t] = S [t] −C [t], and if the obtained discharge demand amount D [t] is negative, When the discharge demand amount D [t] is 0 and the calculated 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: