JP2013074689A - Energy control system and energy control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energy control system and an energy control device allowing a user to use the stored power of a storage battery until a prescribed time and to use up the stored power of the storage battery within the prescribed time.SOLUTION: A schedule setting part 1a of an energy control device 1 predicts future stored power of a storage battery 6, future thermal storage of a heat storage device, and future power demand of a load L. According to these predicted results, the schedule setting part 1a makes a control schedule that determines the amount of generation power of a fuel cell 7 and the amount of discharging power during each of multiple control periods up to a prescribed time so that the stored power will gradually decrease over periods until the future prescribed time, and the stored power will become close to zero at the prescribed time. A schedule execution part 1c controls, according to the control schedule, the amount of the generating power of the fuel cell 7 and the amount of discharging power.

Description

  The present invention relates to an energy management system and an energy management apparatus.

  2. Description of the Related Art Conventionally, there is an energy management system that includes a fuel cell, a storage battery, a solar cell, and the like in an electric power consumer and promotes efficient use of electric power (for example, see Patent Document 1).

JP 2011-78237 A

  An example of conventional nighttime power control is shown in FIG.

  First, the electric power demand curve Y101 shows the electric power demand from 18:00 to 6 o'clock at the consumer, 700 W from 18:00 to 21:00, 500 W from 21:00 to 24:00, 700 W from 24:00 to 3 o'clock, 3 From 6:00 to 6:00, there is a power demand of 700W.

  The electric power demand is composed of regions E101 to E103. The region E101 indicates the generated power of the fuel cell, the region E102 indicates the discharge power of the storage battery, and the region E103 indicates the supply power of the commercial power source. In the time period from 18:00 to 3 o'clock, the generated power of the fuel cell is maintained at 200 W, which is the minimum power generation amount, and the remaining power demand is covered by the discharged power of the storage battery.

  Here, the stored power curve Y102 indicates the stored power of the storage battery. The stored power gradually decreases to 3900 Wh at 18:00, 2400 Wh at 21:00, 1500 Wh at 24:00, and 3 o'clock. At this point, the stored power becomes zero. Therefore, in the time zone from 3 o'clock to 6 o'clock, the generated power of the fuel cell is increased to 500 W, which is the maximum power generation amount, and the remaining power demand is covered by the commercial power source.

  In the conventional system described above, the storage battery is charged by daytime solar cell generated power, fuel cell generated power, commercial power, or the like. From the viewpoint of efficient use of the generated power of the solar battery generated during the daytime, it is desirable to use up the stored power of the storage battery as much as possible by the morning.

  However, the generated power of the solar cell is zero at night. Therefore, if a situation occurs where the stored battery power is used up at an early stage of the night, if it becomes impossible to cover the power demand with only the power generated by the fuel cell, it is necessary to use commercial power, and the amount of commercial power purchased is reduced. It will increase.

  Therefore, there has been a demand for a system that can use the stored power of the storage battery until a predetermined time and can use up the stored power of the storage battery as much as possible at the predetermined time.

  The present invention has been made in view of the above-mentioned reasons, and the purpose thereof is an energy management system that can use the stored power of the storage battery for a predetermined time, and can use up the stored power of the storage battery as much as possible in the predetermined time, and It is to provide an energy management device.

  An energy management system according to the present invention includes a power storage device that stores power and supplies discharge power to a load, and a first power generation device that supplies heat to the load by supplying first generated power to the load. A heat storage device that stores heat generated by the first power generation device, and an energy management device that controls each amount of the discharge power and the first power generation power, and the energy management device includes the power The storage power in the future of the storage device, the amount of heat storage in the future of the heat storage device, and the future power demand of the load are predicted. Based on the prediction result, the storage power is calculated over a period up to a predetermined time in the future. The discharge power and the first power generation power in each of a plurality of control periods up to the predetermined time so that the stored power gradually decreases to 0 at the predetermined time. Create the control schedule to determine the respective amounts of, based on the control schedule, and controlling the respective amounts of the discharge power and the first generated power.

  In the present invention, the power generation device includes a second power generation device that generates power using natural energy during a predetermined power generation time zone and stores second generated power in the power storage device, and the predetermined time is the power generation time zone. Preferably, the plurality of control periods are formed from the end time of the power generation time zone to the start time of the power generation time zone.

  In this invention, it is preferable that the power storage device is a storage battery, the first power generation device is a fuel cell, and the second power generation device is a solar cell.

  In this invention, it is preferable that the first control period starts at the end time of the power generation time zone and ends at the time when the heat storage of the heat storage device is used more than a predetermined amount.

  In this invention, the first power generator supplies the first generated power between a minimum power generation amount that is a lower limit value and a maximum power generation amount that is an upper limit value, and the heat storage device has an upper limit value. The energy management device stores heat within a range of a certain maximum heat storage amount or less, and the energy management device has the maximum remaining power excluding the minimum power generation amount from the total power demand in all the control periods, and the initial remaining time at the start time of the control period. The first control schedule for setting the first power generation power to the minimum power generation amount and covering the maximum remaining power with the discharge power in all the control periods when the power storage power is less than the initial power storage amount. When the maximum remaining power is greater than or equal to the initial power storage amount, the discharge power is greater than a threshold value and the first generated power is less than the maximum power generation amount in at least one control period. And the first power generation power is increased from the minimum power generation amount under the condition that the heat storage amount at the end time of the control period is less than the maximum heat storage amount, and the discharge power is controlled by the first control. By reducing the set value in the schedule and setting the first generated power and the discharged power to the same set values as in the first control schedule in the other control periods, all the control periods It is preferable to create the second control schedule in which the remaining power obtained by removing the first generated power from the total power demand is less than the initial power storage amount.

  In this invention, when creating the second control schedule, the energy management device increases the first generated power from the minimum power generation amount under the conditions, and controls the discharge power to the first control. A simulation process for decreasing from the set value in the schedule is performed in the order of time series from the first control period, and the simulation process is performed when the remaining power becomes less than the initial storage amount in any one of the control periods. It is preferable to stop.

  An energy management device according to the present invention includes a power storage device that stores power and supplies discharge power to a load, and a first power generation device that supplies heat to the load by supplying first generated power to the load. And an energy management device that constitutes an energy management system together with a heat storage device that stores the heat generated by the first power generation device, the stored power in the future of the power storage device, the heat storage amount in the future of the heat storage device, And predicting the future power demand of the load, and based on the prediction result, the stored power gradually decreases over a period up to a predetermined time in the future, and the stored power approaches 0 at the predetermined time. And creating a control schedule in which each amount of the discharge power and the first generated power is determined in each of a plurality of control periods up to the predetermined time. Based on the control schedule, and controlling the respective amounts of the discharge power and the first generated power.

  As described above, the present invention has an effect that the stored power of the storage battery can be used up to a predetermined time and that the stored power of the storage battery can be used up as much as possible during the predetermined time.

It is a block diagram which shows the system configuration | structure of embodiment. It is a flowchart figure which shows a simulation process same as the above. (A) (b) It is a graph which shows the simulation result same as the above. (A) (b) It is a graph which shows the simulation result same as the above. (A) (b) It is a graph which shows the simulation result same as the above. It is a graph which shows the conventional electric power supply.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
FIG. 1 shows a configuration of an energy management system provided for a power consumer, and includes an energy management device 1, power conditioners 2 to 4, a solar cell 5, a storage battery 6, a fuel cell 7, and a hot water storage device 8. .

  The solar cell 5 generates power using sunlight, the fuel cell 7 generates power by a chemical reaction, and the storage battery 6 is charged / discharged.

  Each of the power conditioners 2 to 4 converts the DC power of each of the solar cell 5, the storage battery 6 and the fuel cell 7 into AC power, and supplies this AC power to the distribution paths W2 to W4, and the distribution path W2 -W4 is connected to the load L via the power distribution path W1. Furthermore, AC power is supplied to the distribution path W1 via the distribution path W10 from the commercial power supply 10. That is, the load L is supplied with power by using the solar cell 5, the storage battery 6, the fuel cell 7, and the commercial power source 10 as power sources.

  Further, the power conditioner 3 has a function of storing the storage battery 6 by converting AC power supplied from each of the power conditioners 2 and 4 and the commercial power supply 10 into DC power. That is, the storage battery 6 is charged using the power of the solar battery 5, the fuel battery 7, and the commercial power supply 10.

  Further, the fuel cell 7 generates heat (exhaust heat) along with the power generation, and hot water boiled using the exhaust heat is stored in the hot water storage device 8. The amount of hot water stored in the hot water storage device 8 corresponds to the amount of stored heat. The hot water of the hot water storage device 8 is used for cooking, bathing and the like in the consumer. The fuel cell 7 can generate power in the range of the minimum power generation amount Emin (lower limit value) to the maximum power generation amount Emax (upper limit value). Further, the fuel cell 7 stops power generation when the hot water amount reaches the maximum heat storage amount Hmax (upper limit value).

  The energy management device 1 includes a schedule setting unit 1a, a schedule storage unit 1b, and a schedule execution unit 1c. Then, the energy management device 1 acquires the generated power data of the solar cell 5 from the power conditioner 2, acquires the charge / discharge amount data of the storage battery 6 from the power conditioner 3, and the generated power data of the fuel cell 7 as the power conditioner. Obtained from NA-4. Further, the energy management device 1 acquires hot water amount data from the hot water storage device 8. And the energy management apparatus 1 controls the electric power transferred between each of the power conditioners 2-4 (solar cell 5, storage battery 6, fuel cell 7), the commercial power source 10, and the load L. The power supply is managed.

  The schedule setting unit 1a creates a control schedule for the power conditioners 2 to 4 (solar cell 5, storage battery 6, fuel cell 7), and stores the created control schedule in the schedule storage unit 1b. The schedule execution part 1c controls each operation | movement of the power conditioners 2-4 according to the control schedule of the schedule memory | storage part 1b. The control schedule includes the breakdown of power supplied to the load L (power ratios of the solar battery 5, storage battery 6, fuel cell 7, and commercial power supply 10 in power demand), charge / discharge switching of the storage battery 6 and the like. It is set along the series.

  In the daytime control schedule, power is supplied to the load L using the solar cell 5, the fuel cell 7, and the commercial power supply 10 as power sources. Further, the storage battery 6 is charged by using the solar cell 5, the fuel cell 7, and the commercial power supply 10 as power sources. In the daytime control schedule, the storage battery 6 is prioritized in power storage control, but discharge control is performed if necessary.

  Next, the nighttime control schedule creation process, which is the gist of the present invention, will be described.

  First, when it is assumed that the power generation time zone of the solar cell 5 is from 6:00 to 18:00, the schedule setting unit 1a of the energy management device 1 performs the power generation by the solar cell 5 at 18:00 (or slightly before 18:00). ), A control schedule from 18:00 to 6:00 is created. However, the power generation time zone of the solar cell 5 varies according to the date, season, weather, and the like.

  And the schedule setting part 1a divides | segments the power generation stop time zone of the solar cell 5 from 18:00 to 6 o'clock into four control periods T1 to T4. The control period T1 is set to [18:00 to 21:00], the control period T2 is set to [21:00 to 24:00], the control period T3 is set to [0 to 3 o'clock], and the control period T4 is set to [3 to 6 o'clock]. The The present invention aims to use the stored power of the storage battery 6 until 6 o'clock, which is the start time of the power generation time zone, and to use up the stored power of the storage battery 6 as much as possible at 6 o'clock (making the stored power as close to 0 as possible). It is what. Note that the start time of the control period T1 is set to the end time of the power generation time zone of the solar cell 5, and the end time of the control period T1 significantly increases the heat demand for using hot water in the hot water storage device 8 (for example, a predetermined amount). It is set at the time to use the above hot water.

  And the schedule setting part 1a performs simulation according to the flowchart of FIG. 2, and produces a nighttime control schedule based on this simulation result.

  First, as shown in FIG. 3A, the schedule setting unit 1a sets the generated power Efc (i) (where i = 1, 2, 3, 4) of the fuel cell 7 in the control time period T1 to T4. The minimum power generation amount Emin, which is a lower limit value, is set (S1). Here, Efc (i) indicates the generated power of the fuel cell 7 during the control period Ti.

  The schedule setting unit 1a has a function of predicting a future power demand at a consumer. This power demand prediction function predicts a future power demand based on, for example, past power demand data. It is realized by. Note that this power demand prediction is configured using a known technique, and thus detailed description thereof is omitted.

  Then, the schedule setting unit 1a creates a power demand curve Y1 from 18:00 to 6:00 and calculates power demand Ede (i) (where i = 1, 2, 3, 4) for each of the control periods T1 to T4. To do. Here, Ede (i) indicates the power demand in the control period Ti.

  The schedule setting unit 1a then determines the maximum remaining power [Σ {Ede (i), which is the difference between the power demand Ede (i) (corresponding to the total power demand of the present invention) and the minimum power generation Emin in the control periods T1 to T4. -Emin}].

  Then, the schedule setting unit 1a can cover the maximum remaining power [Σ {Ede (i) −Emin}] of all the control periods T1 to T4 only by the initial storage amount W (18) of the storage battery 6 at 18:00. It is determined whether or not it is possible (S2). That is, the schedule setting unit 1a sets the maximum remaining power [Σ {Ede (i) −Emin}] for the control periods T1 to T4 to the discharge power Esb (i) of the storage battery 6 (where i = 1, 2, 3, It is determined whether or not it can be covered in 4). Here, Esb (i) indicates the discharge power during the control period Ti.

  The determination process of step S2 is executed by predicting the future stored power using the initial stored power W (18), the power demand curve Y1, and the minimum power generation amount Emin, and creating the stored power curve Y2a of the storage battery 6. Is done. If the stored power curve Y2a is predicted to be larger than 0 at the time of 6 o'clock, the maximum remaining power [Σ {Ede (i) −Emin}] can be covered only by the initial stored power W (18). It is determined that it can be done (Yes). On the other hand, if the stored power curve Y2a is predicted to decrease to 0 before 6 o'clock, the maximum remaining power [Σ {Ede (i) −Emin}] can be covered only by the initial stored power W (18). It is determined that it cannot be performed (No).

  When the maximum remaining power [Σ {Ede (i) −Emin}] can be covered only by the initial charged amount W (18), the schedule setting unit 1a ends the process, and the process shown in FIG. A control schedule SK1 (first control schedule) is created.

  In the control schedule SK1 shown in FIG. 3A, the generated power Efc (i) of the fuel cell 7 is suppressed to the minimum power generation amount Emin in all the control periods T1 to T4, and the remaining power demand is the discharge of the storage battery 6. Covered with power Esb (i).

  Furthermore, the schedule setting unit 1a has a function of predicting a future heat demand (hot water demand) in the consumer. This heat demand prediction function is based on, for example, past heat demand data. This is achieved by predicting the heat demand. In addition, about this heat demand prediction, since it is comprised using a well-known technique, detailed description is abbreviate | omitted.

  And the schedule setting part 1a produces the heat demand curve Y3 from 18:00 to 6:00, as shown in FIG.3 (b). Furthermore, the schedule setting unit 1a uses the initial hot water amount H (18) at 18:00, the heat demand curve Y3, the hot water amount data predicted to increase with the power generation of the fuel cell 7, and the like at 18:00 to 6:00. A hot water amount curve Y4a of the hot water storage device 8 is created. The schedule setting unit 1a executes the simulation on the condition that the power generation of the fuel cell 7 is stopped when the hot water amount curve Y4a reaches the maximum heat storage amount Hmax.

  In FIG.3 (b), in the control period T1, the increase in the amount of hot water accompanying the power generation of the fuel cell 7 is balanced with the heat demand, and the hot water amount curve Y4a is constant. In the period T2, there is a significant increase in heat demand (for example, using a predetermined amount or more of hot water), and the hot water amount curve Y4a decreases. Then, after the heat demand becomes zero, the hot water amount curve Y4a increases with the power generation of the fuel cell 7 in the period T2 to T4.

  Next, in the determination process in step S2, it is determined that the maximum remaining power [Σ {Ede (i) −Emin}] cannot be covered only by the initial charged amount W (18). In this case, the schedule setting unit 1a starts the simulation process G1 (steps S3 to S5) in the control period T1.

  In the simulation process G1 in the control period T1, as shown in FIG. 4A, the discharge power Esb (1) in the control period T1 is decreased by a predetermined amount. Further, the generated power Efc (1) in the control period T1 is increased by a predetermined amount determined in advance from the minimum power generation amount Emin (S3).

  Then, the schedule setting unit 1a determines whether or not the control condition of the control period T1 is satisfied (S4). The control condition of the control period T1 is a condition for determining whether or not to continue the simulation process G1 of the control period T1, and [Esb (1)> 0 (threshold), Efc (1) <Emax, H (21) <Hmax]. That is, the discharge power Esb (1) decreased in step S3 is greater than 0, the generated power Efc (1) increased in step S3 is less than the maximum power generation amount Emax, and the hot water amount H (21) at 21:00 is the maximum. If it is less than the heat storage amount Hmax, the control condition of the control period T1 is satisfied.

  Here, as shown in FIG. 4B, the schedule setting unit 1a uses initial hot water amount H (18), heat demand curve Y3, hot water amount data predicted to increase with the power generation of the fuel cell 7, and the like. Thus, a hot water amount curve Y4b of the hot water storage device 8 from 18:00 to 6:00 is created. And the schedule setting part 1a estimates the hot water amount H (21) at 21:00 using this hot water amount curve Y4b, and compares it with the maximum heat storage amount Hmax.

  In step S3, since the generated power Efc (1) in the control period T1 is increased from the minimum power generation amount Emin, the hot water amount curve Y4b increases with the power generation of the fuel cell 7 in the control period T1. In the period T2, there is a significant increase in heat demand, and the hot water volume curve Y4b decreases. Then, after the heat demand becomes 0, the hot water amount curve Y4b increases with the power generation of the fuel cell 7 in the period T2 to T4.

  If the schedule setting unit 1a determines in step S4 that the control condition of the control period T1 is satisfied, the schedule setting unit 1a continues the simulation process G1 of the control period T1. Specifically, the remaining power [Σ that is the difference between the power demand Ede (i) in the control period T1 to T4 (corresponding to the total power demand of the present invention) and the generated power Efc (i) in the control period T1 to T4. {Ede (i) -Efc (i)}] is calculated. In this case, the generated power Efc (1) in the control period T1 is larger than the minimum power generation amount Emin (set value in step S3), and the generated power Efc (2) to Efc (4) in the control period T2 to T4 is the minimum. The power generation amount Emin (set value in step S1) is set. Therefore, the remaining power [Σ {Ede (i) −Efc (i)}] is smaller than the maximum remaining power [Σ {Ede (i) −Emin}].

  Then, the schedule setting unit 1a determines whether or not the remaining power [Σ {Ede (i) −Efc (i)}] can be covered only by the initial charged amount W (18) (S5). That is, the schedule setting unit 1a determines whether or not the remaining power [Σ {Ede (i) −Efc (i)}] of the control periods T1 to T4 can be covered by the discharge power Esb (i) of the storage battery 6. is there.

  In the determination process in step S5, the future stored power is predicted using the initial charged amount W (18), the power demand curve Y1, and the generated power Efc (i), and as shown in FIG. This is executed by creating the stored power curve Y2b. If the stored power curve Y2b is predicted to be greater than 0 at 6 o'clock, the remaining power [Σ {Ede (i) −Efc (i)}] is covered only by the initial stored power W (18). (Yes). On the other hand, if the stored power curve Y2b is predicted to decrease to 0 before 6 o'clock, the remaining power [Σ {Ede (i) −Efc (i)}] is covered only by the initial stored power W (18). It is determined that it cannot be performed (No).

  If the remaining power [Σ {Ede (i) −Efc (i)}] cannot be covered only by the initial charged amount W (18), the schedule setting unit 1a further sets the discharge power Esb (1). Decrease only by quantification. Further, the generated power Efc (1) is further increased by a predetermined amount from the minimum power generation amount Emin (S3). Then, the processes in steps S4 and S5 are performed again.

  In Step S5, when it is determined that the remaining power [Σ {Ede (i) −Efc (i)}] can be covered only by the initial charged amount W (18), the schedule setting unit 1a Is completed, and the control schedule SK2 (second control schedule) of FIG.

  In the control schedule SK2 shown in FIG. 4A, the generated power Efc (1) in the control period T1 is made larger by ΔE1 than the minimum power generation amount Emin. Further, the generated power Efc (2) to Efc (4) in the control period T2 to T4 is set to the minimum power generation amount Emin. The remaining power demand is covered by the discharge power Esb (i) of the storage battery 6.

  On the other hand, if the schedule setting unit 1a determines in step S4 that the control condition of the control period T1 is not satisfied, the schedule setting unit 1a completes the simulation process G1 of the control period T1, and the simulation process G2 of the control period T2 (steps S6 to S8). To start.

  In the simulation process G2 in the control period T2, as shown in FIG. 5A, the discharge power Esb (2) in the control period T2 is decreased by a predetermined amount. Further, the generated power Efc (2) in the control period T2 is increased by a predetermined amount from the minimum power generation amount Emin (S6).

  And the schedule setting part 1a determines whether the control conditions of the control period T2 are satisfy | filled (S7). The control condition for the control period T2 is a condition for determining whether or not to continue the simulation process G2 for the control period T2. [Esb (2)> 0 (threshold), Efc (2) <Emax, H (24) <Hmax]. That is, the discharge power Esb (2) decreased in step S6 is greater than 0, the generated power Efc (2) increased in step S6 is less than the maximum power generation amount Emax, and the hot water amount H (24) at 24:00 is the maximum. If it is less than the heat storage amount Hmax, the control condition of the control period T2 is satisfied.

  Here, as shown in FIG. 5 (b), the schedule setting unit 1 a uses initial hot water amount H (18), heat demand curve Y 3, hot water amount data predicted to increase with power generation of the fuel cell 7, and the like. Thus, the hot water amount curve Y4c of the hot water storage device 8 from 18:00 to 6:00 is created. And the schedule setting part 1a estimates the hot water amount H (24) at 24:00 using this hot water amount curve Y4c, and compares it with the maximum heat storage amount Hmax.

  In the hot water amount curve Y4c, since the generated power Efc (2) in the control period T2 is increased from the minimum power generation amount Emin in step S6, the hot water amount in the control period T2 is increased compared to the hot water amount curve Y4b.

  If the schedule setting unit 1a determines in step S7 that the control condition of the control period T2 is satisfied, the schedule setting unit 1a continues the simulation process G2 of the control period T2. Specifically, the remaining power [Σ {Ede (i) −Efc (i), which is the difference between the power demand Ede (i) in the control period T1 to T4 and the generated power Efc (i) in the control period T1 to T4. }] Is calculated. In this case, the generated power Efc (1) in the control period T1 and the generated power Efc (2) in the control period T2 are larger than the minimum power generation amount Emin (set values in steps S3 and S6). Further, the generated powers Efc (3) and Efc (4) in the control periods T3 and T4 are set to the minimum power generation amount Emin (set value in step S1).

  Then, the schedule setting unit 1a determines whether or not the remaining power [Σ {Ede (i) −Efc (i)}] can be covered only by the initial charged amount W (18) (S8). That is, the schedule setting unit 1a determines whether or not the remaining power [Σ {Ede (i) −Efc (i)}] of the control periods T1 to T4 can be covered by the discharge power Esb (i) of the storage battery 6. is there.

  In the determination process of step S8, the future stored power is predicted using the initial charged amount W (18), the power demand curve Y1, and the generated power Efc (i), and as shown in FIG. This is executed by creating the stored power curve Y2c. If the stored power curve Y2c is predicted to be greater than 0 at the time of 6 o'clock, the remaining power [Σ {Ede (i) −Efc (i)}] is covered only by the initial stored power W (18). (Yes). On the other hand, if the stored power curve Y2c is predicted to decrease to 0 before 6 o'clock, the remaining power [Σ {Ede (i) −Efc (i)}] is covered only by the initial stored power W (18). It is determined that it cannot be performed (No).

  When the remaining power [Σ {Ede (i) −Efc (i)}] cannot be covered only by the initial charged amount W (18), the schedule setting unit 1a further sets the discharge power Esb (2). Decrease only by quantification. Further, the generated power Efc (2) is further increased by a predetermined amount from the minimum power generation amount Emin (S3). Then, the processes in steps S4 and S5 are performed again.

  In Step S5, when it is determined that the remaining power [Σ {Ede (i) −Efc (i)}] can be covered only by the initial charged amount W (18), the schedule setting unit 1a Is completed, and the control schedule SK3 (second control schedule) of FIG.

  In the control schedule SK3 shown in FIG. 5A, the generated power Efc (1) in the control period T1 is larger than the minimum power generation amount Emin by ΔE1, and the generated power Efc (2) in the control period T2 is larger than the minimum power generation amount Emin by ΔE2. doing. Furthermore, the generated power Efc (3) and Efc (4) in the control periods T3 and T4 are set to the minimum power generation amount Emin. The remaining power demand is covered by the discharge power Esb (i) of the storage battery 6.

  On the other hand, if it is determined in step S7 that the control condition for the control period T2 is not satisfied, the schedule setting unit 1a completes the simulation process G2 for the control period T2 and starts the simulation process G3 for the control period T3.

  In the simulation process G3 in the control period T3, the schedule setting unit 1a decreases the discharge power Esb (3) in the control period T3 by a predetermined amount. Further, the generated power Efc (3) in the control period T3 is increased by a predetermined amount that is determined in advance from the minimum power generation amount Emin. Thereafter, similarly to the simulation processes G1 and G2, the schedule setting unit 1a determines whether or not the control condition of the control period T3 is satisfied. Furthermore, the schedule setting unit 1a determines whether or not the remaining power [Σ {Ede (i) −Efc (i)}] can be covered only by the initial charged amount W (18).

  When the schedule setting unit 1a determines in the simulation process G3 that the control condition for the control period T3 is not satisfied, the schedule setting unit 1a completes the simulation process G3 and starts the simulation process G4 for the control period T4.

  In the simulation process G4 in the control period T4, the schedule setting unit 1a decreases the discharge power Esb (4) in the control period T4 by a predetermined amount. Further, the generated power Efc (4) in the control period T4 is increased by a predetermined amount that is predetermined from the minimum power generation amount Emin. Thereafter, similarly to the simulation processes G1 and G2, the schedule setting unit 1a determines whether or not the control condition of the control period T4 is satisfied. Furthermore, the schedule setting unit 1a determines whether or not the remaining power [Σ {Ede (i) −Efc (i)}] can be covered only by the initial charged amount W (18).

  When the schedule setting unit 1a determines that the control condition of the control period T4 is not satisfied in the simulation process G4, the simulation process G4 is completed.

  The contents of the simulation processes G3 and G4 are substantially the same as those of the simulation processes G1 and G2, and thus detailed description thereof is omitted.

  In this manner, the schedule setting unit 1a creates a control schedule over the control periods T1 to T4 by performing the simulation shown in FIG. 2 (see FIGS. 4A and 5A). In this control schedule, the stored power of the storage battery 6 gradually decreases over the entire period of the power generation stop time zone (18:00 to 6:00) of the solar battery 5. That is, in the middle of the power generation stop time zone (18:00 to 6:00) of the solar battery 5, the stored power of the storage battery 6 is not reduced to 0 while the stored power of the storage battery 6 falls within the period of 18:00 to 6:00. It is possible to prevent the situation where all the power is used up.

  In the present embodiment, as described above, the discharge power of the storage battery 6 and the generated power of the fuel cell 7 are controlled based on the prediction results of the stored power and the heat storage amount. Thus, the stored power of the storage battery 6 can be used until 6 o'clock, which is the start time of the power generation time zone, and the stored power of the storage battery 6 can be used up as much as possible at 6 o'clock (the amount of stored power is as close to 0 as possible). . Further, since both the generated power of the fuel cell 7 and the stored power of the storage battery 6 can be used in the power generation stop time zone of the solar battery 5, the amount of commercial power purchased can be suppressed.

  Furthermore, at 6 o'clock, which is the power generation start time of the solar cell 5, the stored power of the storage battery 6 is used up as much as possible (the amount of stored power is made as close to 0 as possible), so that the use efficiency of the generated power of the solar cell 5 can be increased.

  Furthermore, the fuel cell 7 generally has higher energy efficiency as the generated power is larger. Therefore, in this system, when the stored power of the storage battery 6 is insufficient at night, the generated power of the fuel cell 7 is used, so that the generated power of the fuel cell 7 is increased and the energy efficiency is increased.

  Further, in this system, the amount of hot water stored in the hot water storage device 8 is increased by increasing the generated power of the fuel cell 7 at night, so that the occurrence of hot water shortage can be suppressed as much as possible.

  In addition, the solar cell 5, the storage battery 6, the fuel cell 7, and the hot water storage device 8 correspond to the second power generation device, the power storage device, the first power generation device, and the heat storage device of the present invention, respectively. The second power generation device is not limited to a solar cell as long as it is configured to generate power using natural energy. In addition, the power storage device is not limited to a storage battery as long as it is configured to store and discharge power. In addition, the first power generation device is not limited to the fuel cell as long as the first power generation device generates heat accompanying power generation. In addition, the heat storage device is not limited to the hot water storage device as long as the heat generated by the first power generation device can be stored.

DESCRIPTION OF SYMBOLS 1 Energy management apparatus 1a Schedule setting part 1b Schedule memory | storage part 1c Schedule execution part 5 Solar cell (2nd electric power generating apparatus)
6 Storage battery (power storage device)
7 Fuel cell (first power generator)
8 Hot water storage device (heat storage device)
L load

Claims (7)

A power storage device that stores power and supplies discharge power to a load;
A first power generation device that supplies first generated power to the load and generates heat accompanying power generation;
A heat storage device for storing heat generated by the first power generation device;
An energy management device that controls each amount of the discharged power and the first generated power;
The energy management device predicts the future stored power of the power storage device, the future heat storage amount of the heat storage device, and the future power demand of the load, and based on the prediction result, The discharge power and the first generated power in each of a plurality of control periods up to the predetermined time so that the stored power gradually decreases over a period and the stored power approaches 0 at the predetermined time. An energy management system, wherein a control schedule in which each amount is determined is created, and each amount of the discharge power and the first generated power is controlled based on the control schedule.   A second power generation device that generates power using natural energy during a predetermined power generation time zone and stores second generated power in the power storage device is provided, and the predetermined time is a start time of the power generation time zone The energy management system according to claim 1, wherein the plurality of control periods are formed from an end time of the power generation time zone to a start time of the power generation time zone.   The energy management system according to claim 2, wherein the power storage device is a storage battery, the first power generation device is a fuel cell, and the second power generation device is a solar cell.   4. The energy management system according to claim 2, wherein the first control period starts at an end time of the power generation time period and ends at a time when heat storage of the heat storage device is used for a predetermined amount or more. The first power generation device supplies the first generated power between a minimum power generation amount that is a lower limit value and a maximum power generation amount that is an upper limit value, and the heat storage device has a maximum heat storage amount that is an upper limit value. Stores heat within the following range,
The energy management device includes:
When the maximum remaining power obtained by removing the minimum power generation amount from the total power demand in all the control periods is less than the initial power storage amount that is the stored power at the start time of the first control period, in all the control periods , Setting the first generated power to the minimum power generation amount, creating the first control schedule to cover the maximum remaining power with the discharged power,
When the maximum remaining power is greater than or equal to the initial power storage amount, the discharge power is greater than a threshold value and the first generated power is less than the maximum power generation amount in at least one control period, and the control Under the condition that the heat storage amount at the end time of the period is less than the maximum heat storage amount, the first generated power is increased from the minimum power generation amount, and the discharge power is set from the set value in the first control schedule. The first power generation in all the control periods is reduced by setting the first power generation power and the discharge power to the same set values as in the first control schedule in the other control periods. The second control schedule in which the remaining power obtained by removing power from the total power demand is made less than the initial storage amount is created. 4. The energy management system according to any one of the above. When the energy management device creates the second control schedule,
Under the condition, a simulation process for increasing the first generated power from the minimum power generation amount and decreasing the discharge power from a set value in the first control schedule is performed in chronological order from the first control period. 6. The energy management system according to claim 5, wherein the simulation process is stopped when the remaining power becomes less than the initial power storage amount in any one of the control periods. A power storage device that stores electric power and supplies discharge power to a load, a first power generation device that supplies first generated power to the load, and generates heat accompanying power generation, and the first power generation device An energy management device that constitutes an energy management system together with a heat storage device that stores the generated heat,
Predicting the future stored power of the power storage device, the future heat storage amount of the heat storage device, and the future power demand of the load, and based on the prediction result, the power storage over a period up to a predetermined time in the future Each amount of the discharged power and the first generated power is determined in each of a plurality of control periods up to the predetermined time so that the electric power gradually decreases and the stored electric power approaches 0 at the predetermined time. An energy management apparatus that creates a control schedule and controls each amount of the discharge power and the first generated power based on the control schedule.

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