JP5586080B2 - Power supply system - Google Patents

Description

The present invention relates to a power supply system.

Regarding power supply, various proposals have been made from the viewpoint of reducing the environmental load. For example, in Japanese Patent Laid-Open No. 11-127546 (Patent Document 1), a solar cell, a storage battery, and a grid-connected inverter with a self-sustaining operation function are configured. In a photovoltaic power generation system that supplies power to a specific load by operating the inverter in a stand-alone operation mode using solar cells and storage batteries as a power source in the event of a disaster, the inverter has a bidirectional function and the system power supply is normal for auxiliary charging of the storage batteries In such a case, a solar power generation system has been proposed in which the inverter is operated in the converter mode and is performed with electric power on the system side. Further, it has been proposed that the auxiliary charging of the storage battery is performed after the grid-connected solar power generation operation is stopped, and further that the auxiliary charging of the storage battery is performed in a time zone where the late-night electricity rate is applied. Japanese Patent Laid-Open No. 2008-202983 (Patent Document 2) proposes a power selling system using solar power generation.

JP 11-127546 A JP 2008-202983 A

However, regarding power supply, there are still many problems to be examined from the viewpoint of reducing the environmental load.

The subject of this invention is providing the electric power supply system which contributes to environmental load reduction in view of the above.

In order to solve the above-described problems, the present invention provides a solar power generation unit, a power input / output unit that sells power from the solar power generation unit to a commercial AC power source and receives power supply from the commercial AC power source, and power from the commercial power source. Provided is a power supply system including a supply restriction unit that restricts supply and a control unit that controls whether restriction by the supply restriction unit is possible. In ordinary power sales by solar power generation, surplus power is sold that exceeds the amount of power consumed by the commercial AC power source. Since the sale of generated power can be secured, the introduction of solar power generation systems can be promoted economically.

  According to a specific feature of the present invention, the power supply system includes a storage battery that is charged by power supply from a commercial power source. This increases the degree of freedom in securing and consuming power in the power supply system. According to a more specific feature, the power consuming unit is supplied with power from the storage battery. As a result, the power securing timing and the consumption timing can be shifted as compared with the case where power is directly supplied from the commercial power source. According to a more specific feature of the present invention, the power consuming unit receives a direct power supply from a commercial power source when the control unit does not limit the power supply by the supply limiting unit.

  According to another specific feature of the present invention, the control unit controls whether or not to restrict power supply from the commercial power source to the storage battery. According to a more specific feature of the present invention, the control unit does not limit the power supply from the commercial power source to the storage battery in the late-night power rate period. Thereby, it is possible to charge the storage battery at a low cost late-night electricity charge and to secure power. According to a more specific feature, the storage battery can also be charged by supplying power from the solar power generation unit. As a result, when there is a possibility that the power of the storage battery will be exhausted by the late-night power charge time zone, it becomes possible to charge the solar power generation unit supplementarily.

  According to another specific feature of the invention, the storage battery can also be charged by power supply from an external storage battery. According to another specific feature, the storage battery can supply power to an external storage battery. As a result, the storage battery has a power interchange function in addition to shifting the securing timing and consumption timing of power, and the utilization of the storage battery is increased. And the effect of sharing a virtual large capacity storage battery as a whole can be acquired by the interchange of the electric power of the storage battery between several households.

  According to another specific feature of the present invention, the control unit limits power supply from the commercial power source by the supply limiting unit when the solar power generation unit is generating power. As a result, solar power generation can be clearly positioned as a function for selling power, and introduction of a solar power generation system can be promoted economically.

According to another aspect of the present invention, a storage battery that can be charged with low-cost power and high-cost power that is higher than this, a supply unit that supplies power stored in the storage battery to an external storage battery, and high-cost power There is provided a power supply system including a control unit that restricts supply of electric power corresponding to charging from a supply unit to an external storage battery. Thereby, interchange of electric power with an external storage battery is limited to low-cost electric power, and confusion in power charge settlement can be prevented.

According to the specific feature of the present invention, the low cost power is power supplied in the midnight power charge time zone from the commercial power supply, and the high cost power is other than the midnight power charge time zone from the commercial power supply. It is the electric power supplied to. According to another specific feature, low-cost power is power supplied from a commercial power source in the late-night power charge time zone, and high-cost power is power supplied from a solar power generation unit. is there.

According to the other specific feature of the present invention, the control unit calculates the amount of power corresponding to charging by the high cost power in the storage battery based on the charging by the high cost power to the storage battery and the power consumption from the storage battery. As a result, the amount corresponding to the high cost power in the storage battery can be distinguished.

  According to another aspect of the present invention, a solar power generation unit, a power input / output unit that sells power from the solar power generation unit to a commercial AC power source and receives power supply from the commercial AC power source, and a midnight power charge from the commercial power source An electric power supply system is provided that includes a storage battery that is charged with electric power supplied in a time zone, and an electric power consumption unit that consumes electric power supplied from the storage battery during power sale by a solar power generation unit. Thereby, the electric power by solar power generation can be sent to electric power sale by consuming the electric power from the storage battery charged with the late-night electric power charge during the solar power generation.

  According to another feature of the present invention, the storage battery is charged by the power supplied from the commercial power source during the midnight power rate time period, and when the storage battery has power outside the midnight power rate time period from the commercial power source, A power supply system is provided that includes a distribution board that receives power supply and receives power directly from a commercial power source when the storage battery has no power. As a result, the power from the commercial power source is charged at low cost in the late-night power charge time zone, and basically the battery power is consumed outside the late-night power charge time zone. The power from the commercial power source can be consumed directly without loss due to discharge.

As described above, according to the present invention, the environmental load is increased by using solar cells, using storage batteries for storing inexpensive late-night power, or using storage batteries for accommodating inexpensive power among multiple homes. A power supply system that contributes to reduction can be provided.

1 is a block diagram of a power supply system according to an embodiment of the present invention. It is the table | surface which put together the control state of each switch by the control part of FIG. It is a block diagram of the electric power charged by the storage battery of FIG. It is a charging power block diagram of the storage battery regarding the electric power interchange between several households. It is a basic flowchart which shows the switch control function of the control part of FIG. It is a flowchart which shows the detail of step S14 of FIG. It is a flowchart which shows the detail of step S2 of FIG. It is a flowchart which shows the detail of step S72 of FIG.

  FIG. 1 is a block diagram of a power supply system according to an embodiment of the present invention. The embodiment is configured as an apartment house such as an apartment 2 and FIG. 1 shows the first home 4 and the second home 6 for the sake of simplicity as a representative of the resident home. The family is moving in. A photovoltaic power generation panel 8 is installed on the roof of the apartment 2, and is distributed to the first household panel 10, the second household panel 12, and the like. Moreover, the apartment 2 is drawn into each home where an AC power line is occupying from a single-phase three-wire commercial power supply 14.

  Next, taking the first home 4 as an example, the detailed configuration of the power supply system of the embodiment will be described. The first household panel 10 in the solar cell panel 8 is connected to a first household power conditioner 18 via a connection box 16 dedicated to the first household. The power conditioner 18 converts the DC power from the junction box 16 into a DC / DC converter 20 that converts the DC power into the most efficient voltage and the AC / AC converter 20 that is set to be slightly higher than the maximum voltage at the commercial AC power supply level. DC / AC converter 22. The photovoltaic power generation AC power output from the DC / AC converter 22 is connected to the power sale meter 24 and sold to the single-phase three-wire commercial power supply 14 side via the power sale meter 24 and the hourly power purchase meter 26. The This price for selling electricity is double the normal electricity charge at the time of purchasing electricity. Note that the single-phase three-wire commercial power supply 14 is usually connected via a power purchase meter 26 and a power sale meter 24 for each time period for power purchase when power cannot be generated by the solar power generation panel 8 or power purchase at a late-night power charge. It is possible to supply power to the first home as usual.

The control unit 28 controls various switches provided in the system. Information on the power generation state of the power conditioner 18 necessary for control and information on the state of the overtime power purchase meter are input through the connections indicated by P and Q in FIG. First, the control unit 28 controls the A switch 34 provided in the charging path connected to the storage battery 32 from the DC / DC converter 20 of the power conditioner 18 via the step-down unit 30. Then, when the amount of charge of the storage battery 32 is insufficient during the daytime, the A switch 34 is closed to supplementarily charge the power generated by the photovoltaic power generation panel 8. The storage battery 32 basically purchases and charges AC power from the single-phase three-wire commercial power supply 14 at a late-night power charge and uses it in the first home outside the late-night power charge time zone. It is provided. For this purpose, the control unit 28 controls the B switch 36 connected to the power purchase meter 24 to close in the late-night power charge time zone, and charges the storage battery 32 via the AC / DC converter and the step-down unit 38. The late-night power charge is set to 1/3 of the normal charge.

The electric power stored in the storage battery 32 is fed from the DC distribution board 40 to the DC home appliance 42. The DC home appliance 42 includes LED lighting 44 and the like. The electric power stored in the storage battery 32 is further fed from the AC distribution board 46 to the AC home appliance 48 via the DC / AC converter and the booster 44. AC home appliances are general home appliances that are fed from a normal household outlet. The control unit 28 directly drives the AC home appliance with the single-phase three-wire commercial power supply 14 when the power of the storage battery 32 is deficient in the late-night charge time zone or outside the late-night charge time zone. 24 and the AC switchboard 46 are controlled to close the C switch 50.

The second home 6 has the same configuration as that of the first home 4, but for the sake of simplicity, only a representative configuration is shown and the others are omitted. As apparent from FIG. 1, the second home 6 is provided with a storage battery 52 similar to the storage battery 32 of the first home, but both of them can be charged for the charged power. The fee for this accommodation is the extent of adding the loss at the time of conversion between AC and DC and charging / discharging of the storage battery to the late-night electricity rate from the single-phase three-wire commercial power source, and it is significantly cheaper than the normal electricity rate ing. For this purpose, the DC distribution board 40 is connected to a D switch 54 for DC power sale and an E switch 56 for DC power purchase, and is connected to the second home 6 via a DC trading meter 58. Yes. The profit / loss display unit 60 is connected to the power sale meter 24, the hourly power purchase meter 26, and the DC trading meter 58, and displays the profit and loss of the power sale and power purchase.

The switch 62 on the second home 6 side for DC power interchange with the first home 4 has the same configuration as the D switch 54 of the first home 4 and the E switch 56 for DC power purchase. It is illustrated. Note that the DC trading meter of the second home 6 is not shown. The direct current trading is not a two-party transaction between the first home 4 and the second home 6 but is a one-to-other transaction between all the households in the apartment 2, and therefore a common direct current is used between the households. Connected to wiring. As already described, the second home 6 and other homes have the same configuration as the first home 4. The main thing about the second home will be described. The second home panel 12 of the photovoltaic power generation panel 8 is connected to the power conditioner 66 through the connection box 64. The electric power sale / purchase meter 68 is the same as the electric power sale meter 24 and the hourly electricity purchase meter 26 in the first home, and these are collectively illustrated. The AC power purchased through the power selling / buying meter 68 charges the storage battery 52 through the switch 70. The AC / DC converter and the step-down unit are not shown. Photovoltaic power generated from the power conditioner 66 is sold via a power purchase meter 68 and also stores a storage battery 52 via a switch 72. The step-down unit is not shown. In addition, although the explanation and illustration are omitted one by one, the second home 6 has the same configuration as the first home 4.

FIG. 2 summarizes the control state of each switch by the control unit 28. FIG. 2A relates to the A switch 34, the B switch 36, and the C switch 50, and FIG. 2B illustrates the D switch. 54 and the E switch 56. As apparent from FIG. 2 (A), the A switch 34 for charging the storage battery 32 with the photovoltaic power is closed when the photovoltaic power is present and the power stored in the storage battery 32 is insufficient. Open otherwise. In FIG. 2A, the parentheses of ON, such as “(ON)”, indicate that the switch is auxiliary closed. That is, as described above, charging of the storage battery 32 is normally performed from a single-phase three-wire commercial power point at a late-night power charge, and charging via the A switch 34 is performed at a time other than the late-night power charge time zone. It is only a supplementary measure when power is insufficient.

The B switch 36 is closed in order to charge the storage battery 32 from the single-phase three-wire commercial power point in the late-night power charge time zone, and is not yet in the late-night power charge time zone after sunset without solar power generation. If the power of the battery 32 is insufficient in the state, it is shall be closed supplementarily. The B switch 36 is open in other situations. On the other hand, the C switch 50 is closed in order to drive the AC home appliance by directly consuming the power of the single-phase three-wire commercial power supply 14 in the late-night power charge time zone. This is because it is more efficient to drive the battery directly from the B switch 36 than once through the storage battery 32 in the late-night charge time zone without loss of power. Further, the C switch 50 is supplementarily closed when the power stored in the storage battery 32 is deficient regardless of the presence or absence of photovoltaic power generation.

Further, as apparent from FIG. 2B, the D switch 54 for selling DC power from the storage battery 32 to another home and the power for charging the storage battery 32 by purchasing DC power from another home. The E switch 56 is first closed in the late-night power charge time zone. This is because, in the late-night price period, the storage battery in each household is considered as one virtual large storage battery that goes beyond the boundaries of the home, and cooperates as much as possible to try to accumulate low-cost power and have a sufficient capacity. This is to allow power interchange. In addition, there is a possibility that the storage battery 32 stores not only the power charged at the late-night power price but also the power generated by solar power generation with a high unit price or the power purchased in the normal time zone. In this embodiment, since the electricity charged at such a high unit price is interchanged with other households at a unit price equivalent to the midnight power rate, the settlement of the power interchange will be confused. In the present embodiment, of the power stored in the storage battery 32 Except for the power charged at a high unit price, only the power purchased and charged at midnight power charges is targeted, and only when there is a surplus there is accommodation to other households.

In FIG. 2B, switch control is performed outside the midnight power charge time zone in accordance with the above-described idea. First, the D switch 54 for selling DC power from the storage battery 32 to other households is closed only when the storage battery 32 has sufficient charge power and there is a margin for the purchased power at midnight. Otherwise it is opened. on the other hand. The E switch 56 for purchasing DC power from another household and charging the storage battery 32 is closed when the charging power of the storage battery 32 is insufficient, and is opened otherwise.

FIG. 3 is a configuration diagram of the stored power for explaining the sufficiency or deficiency of the power of the storage battery 32 and the surplus of the DC power purchase described above. FIG. 3A and FIG. 3B are examples in the case where the amount of power stored in the capacity 102 of the storage battery 32 is composed only of the electric power 104 purchased at the midnight power rate. Here, in FIG. 3A, the late-night charge purchase 104 is charged in a state where there is a surplus exceeding the power line 106 that can be consumed by the next late-night charge time zone. In this case, it is not necessary to charge the storage battery 32 outside the midnight power charge time zone, and the surplus power can be sold to other households. On the other hand, in FIG. 3B, the amount of charge by the late-night charge purchase portion 104 is less than the power line 106 that can be consumed by the next late-night charge time zone. In this case, it is necessary to charge the storage battery 32 by the next midnight power charge time zone. And, of course, there is no surplus that can be sold to other households.

On the other hand, FIG. 3C to FIG. 3E show that the amount of power stored in the capacity 102 of the storage battery 32 is purchased at the midnight power charge 104, and the power generation charge for the unit price plus the normal charge purchase. This is an example in the case of being composed of minutes 108. Here, in FIG. 3C, the midnight charge purchase portion 104 alone exceeds the power line 106 that can be consumed by the next midnight charge time zone, and the total charge amount naturally exceeds the line 106 as well. . Therefore, it is not necessary to charge the storage battery 32 outside the midnight power charge time zone. It should be noted here that the surplus power that can be purchased by other households is not all the power that exceeds the line 106, but the portion that excludes the power generation charge with a higher unit price plus the normal charge purchase 108. That is.

On the other hand, in FIG. 3D, the late-night charge purchase portion 104 is below the power line 106 that can be consumed by the next late-night charge time zone, and the power generation charge portion with a higher unit price plus the normal charge purchase portion 108 is reduced. The total added exceeds the line 106. In this state, it is not necessary to charge the storage battery 32 outside the midnight power charge time zone, but there is no surplus power that can be sold to other households. FIG. 3 (E) shows that the late-night charge purchase 104 is below the power line 106 that can be consumed by the next late-night charge period, and the power generation charge with a higher unit price plus the normal charge purchase 108 is added. The total is below line 106. In this state, it is necessary to further charge the storage battery 32 from a power source having a high unit price outside the midnight power charge time zone. Of course, there is no surplus power that can be sold to other households.

FIG. 4 is a configuration diagram of the stored power for explaining the interchange of the power purchased at the midnight power rate, and the same number is assigned to the same meaning as in FIG. 3. 4 (A1) shows the storage power configuration of the storage battery 32 of the first home 4, and FIG. 4 (A2) shows the storage power configuration of the storage battery 52 of the second home 6. 4 (A1) and 4 (A2) are cases where there is no interchange of stored power. As apparent from FIG. 4 (A1), in the first home 4, the amount of power stored in the capacity 102 of the storage battery 32 is constituted only by the amount of power 104 purchased at the midnight power rate. Since the amount of charge exceeds the power line 106 that can be consumed by the next midnight charge time zone, it is not necessary to charge the storage battery 32 outside the midnight power charge time zone. On the other hand, the storage battery 52 of the second home 6 is composed of a power portion 104 purchased at a late-night power charge, and a power generation charge portion with a high unit price plus a normal charge purchase portion 108. The late-night charge purchase 104 is below the power line 106 that can be consumed by the next late-night charge time zone. Therefore, as in the first home, it is not necessary to charge the storage battery 32 except in the late-night electricity charge time zone. However, the power scheduled to be consumed by the second home by the next midnight electricity billing time period includes a high power unit price, which is expensive.

On the other hand, FIG. 4 (B1) shows the storage power configuration of the storage battery 32 of the first home 4 and FIG. 4 (B2) shows the storage power configuration of the storage battery 52 of the second home 6, but there is power interchange. The case is shown. As is clear from FIG. 4 (B1), of the surplus power in the first home 4, the sold power 112 is purchased by the second home 6 as indicated by the arrow 114, and as shown in FIG. 4 (B2). The storage battery 52 is charged as power purchase 116. Accordingly, the power configuration of the storage battery 52 of the second home 6 in FIG. 4 (B2) is obtained by adding the power purchased 116 from the first home 4 to the power 104 purchased at the late-night power charge, It is a low-cost configuration that is equivalent to a midnight electricity charge. In this way, low-cost power procurement as a whole can be realized by accommodating power purchased at a late-night power rate among a plurality of households.

FIG. 5 is a basic flowchart showing the switch control function of the control unit 28 of FIG. 1 in the embodiment of the present invention. The flow starts with the installation of the system. First, in step S2, a charge amount that can be consumed in the home by the next midnight fee time zone and a surplus charge amount that can be accommodated in another home by the next midnight fee time zone are set. Process. Details thereof will be described later. Next, in step S4, it is checked whether the current time is in the late-night electricity charge time zone. If it is not the midnight power charge time zone, the process proceeds to step S6, where it is checked whether the charge amount of the storage battery 32 is greater than or equal to the charge amount that can be consumed in the home by the next midnight charge time zone.

If it is determined in step S6 that there is a charge amount that can be consumed by the late-night electricity charge time zone, the process proceeds to step S8, the A switch 34 for solar power charging is opened, and the process proceeds to step S10, where single-phase three-wire The B switch 36 for charging the AC power from the commercial power source 14 is opened. Further, in step S12, the C switch 50 for directly consuming AC power from the single-phase three-wire commercial power supply 14 is opened, and the process proceeds to step S14. As described above, when the amount of charge of the storage battery 32 is equal to or greater than the amount of charge that can be consumed at home by the next midnight fee time period, the power consumption is solely provided by the power of the storage battery. This applies not only to the DC home appliance 42 but also to the AC home appliance 48. Therefore, when there is solar power generation power, all the power generation amount can be sent to the power sale by opening the switch for power purchase, and the revenue can be doubled.

On the other hand, if it is determined in step S6 that the amount of charge that can be consumed by the late-night power charge time period is insufficient, the process proceeds to step S16 to check whether solar power generation is in progress. If solar power is being generated, the process proceeds to step S18, and the A switch 34 for solar power charging is closed. Further, in step S20, the B switch 36 for charging AC power from the single-phase three-wire commercial power supply 14 is opened. As a result, during the solar power generation, the insufficient charge is performed only by the solar power generation. Further, in step S22, the C switch 50 for directly consuming AC power from the single-phase three-wire commercial power supply 14 is closed, and the process proceeds to step S14. The reason for closing the C switch 50 is that, for direct consumption, it is more economical to consume AC power purchased at a normal rate than to self-consume solar power that can be sold twice. is there.

If it is confirmed in step S4 that it is a late-night power charge time zone, the process proceeds to step S24, and the A switch 34 for charging solar power without power generation is opened. In step S26, the B switch 36 for charging the AC power from the single-phase three-wire commercial power supply 14 is closed, and the AC power from the single-phase three-wire commercial power supply 14 is purchased at a midnight power rate. The storage battery 32 can be charged. Then, the process proceeds to step S22, the C switch 50 is closed, and the direct power consumption from the single-phase three-wire commercial power supply 14 at the late-night power charge is also possible, and the process proceeds to step S14.

In step S14, the direct current trading process with the other household in the storage battery 32 is performed, and it transfers to step S28. Details of step S14 will be described later. In step S28, it is checked whether the regular maintenance time of the system has arrived or whether a manual maintenance operation has been performed. If neither is detected, the process returns to step S2. Thereafter, unless maintenance is detected in step S28, steps S2 to S28 are repeated, and each switch is controlled in accordance with various situations.

FIG. 6 is a flowchart showing details of the direct current transaction processing in step S14 of FIG. When the flow starts, a check is made in step S32 as to whether or not it falls within the late-night electricity charge time zone, and if not, the process proceeds to step S34, where the charged amount of the storage battery 32 is at home until the next late-night charge time zone. Check if there is more charge than can be consumed. If it is true, there is no need to purchase power, so the process proceeds to step S36, the E switch 56 for DC power purchase is closed, and the process proceeds to step S38. In step S, it is checked whether there is a surplus in the amount of charge for midnight purchase that can be accommodated in another home by the next midnight fee time zone. If there is no surplus, the process proceeds to step S40, where the D switch 54 for DC power sale is opened and the flow is terminated.

On the other hand, if it is confirmed in step S34 that the amount of charge of the storage battery 32 is not greater than the amount of charge that can be consumed at home by the next midnight fee time zone, the process proceeds to step S42, and the E switch 56 for DC power purchase is opened. DC power can be purchased from other households. Of course, since there is no surplus of power sales, the process proceeds to step S40 to open the D switch 54 for DC power sales, and the flow ends. Further, if it is confirmed in step S32 that it corresponds to the late-night electricity charge time zone, the process proceeds to step S44, the DC switch E switch 56 is closed to enable power purchase from another home, and in step S46 the direct current is purchased. The D switch 54 for power sale is closed so that power can be sold to other households. In this way, DC power can be freely bought and sold in the late-night electricity charge time zone. If it is confirmed in step S38 that there is a surplus in the amount of midnight purchase power that can be accommodated in another household by the next midnight fee time zone, the flow proceeds to step S46, and the D switch 54 for DC power sale is turned on. Close to end the flow. In this way, outside of the late-night electricity charge time period, power can be sold only when there is surplus in the charge power for the late-night electricity sales, and even if power that can be consumed by the next late-night charge time period is charged, the cost can be If there is no surplus when deducting high charge, there is no accommodation to other households.

FIG. 7 shows details of the processing for setting the charge amount that can be consumed in the home by the next midnight fee time zone and the surplus charge amount that can be accommodated in another home by the next midnight fee time zone in step S2 of FIG. It is a flowchart which shows. When the flow starts, it is checked in step S52 whether or not 7:00 am when the midnight fee time period expires has arrived. The check in step S52 is performed only for the extremely short time zone corresponding to the period after the repetition of the flow of FIG. 5 after 7 am, and after that time zone, it is determined that the time corresponds to the arrival of 7 am Not. If the arrival of 7 am is detected in step S52, the process proceeds to step S54 where the power consumption accumulation data for one day is reset and the accumulation is restarted, and the process proceeds to step S56. On the other hand, if arrival at 7 am is not detected in step S52, the process directly proceeds to step S56.

In step S56, it is checked whether or not it is a midnight fee time zone, and if it is not a midnight fee time zone, it is checked in step S58 whether or not the storage battery 32 is being discharged. This means checking whether or not the electric power stored in the storage battery 32 is being consumed. If not discharging, the process proceeds to step S60 to check whether or not an instruction to close the C switch 50 is being issued. This is a check of whether or not the AC home appliance is driven by directly consuming the power of the single-phase three-wire commercial power supply 14. And if applicable, it progresses to step S62, accumulation of grand power consumption data is performed, and it transfers to step S64. Moreover, also when the discharge of the storage battery 32 is detected by step S58, it transfers to step S62.

In this way, when the storage battery 32 is discharged or the single-phase three-wire commercial power supply 14 is directly consumed, the power consumption data is accumulated in step S62. In addition, even if it shifts to step S62 in any case, since total power consumption data is accumulated in step S62, when both the discharge of the storage battery 32 and the direct consumption of the single-phase three-wire commercial power supply 14 occur simultaneously. The power consumption data obtained by adding them is accumulated. On the other hand, if it is detected in step S56 that it is a midnight time zone, or if it is not detected in step S60 that an instruction to close the C switch 50 is being issued, it is not necessary to accumulate power consumption. The process proceeds to S64.

In step S64, it is checked whether or not 11:00 pm when the late-night electricity charge period starts has arrived. In the same manner as in step S52, the check in step S64 is performed only for the extremely short time zone corresponding to several cycles of the flow of FIG. 5 after 11 pm, and when that time zone passes, the time comes to 11:00 pm It is not judged to fall under this category. When the arrival of 11:00 pm is detected in step S64, the process proceeds to step S66, where the power consumption accumulation data accumulation for one day is terminated, and the power consumption data from 7:00 am to 11:00 pm as the actual result of the day is determined. . In the next step S68, the charge amount data that can be consumed before the midnight power charge time zone set at the present time is called. In step S70, the current data called in step S68 and the latest one-day data determined in step S68 are weighted and averaged, and the power amount data that can be consumed by the late-night power charge time zone is updated. Transition. On the other hand, when arrival at 11:00 pm is not detected in step S64, the process directly proceeds to step S72. In this way, the power amount data that can be consumed by the late-night electricity rate time zone, which is the predicted value , is corrected daily based on the actual results so that there is no deviation from the actual.

In step S <b> 72, a process of calculating a high-cost power component that cannot be accommodated between households in the storage battery 32 is performed. Details thereof will be described later. Next, in step S74, the charge amount data that can be consumed by the late-night power charge time zone is called. This data is the latest data updated when step S66 to step S70 function. In step S76, the interchangeable data obtained in step S72 is subtracted from the data called in step S74. In the next step S78, the subtraction result in step S76 is updated as surplus charge amount data that can be accommodated by the next midnight fee time zone, and the flow ends.

FIG. 8 is a flowchart showing details of the interchange inseparable calculation process in step S72 of FIG. When the flow starts, in step S82, the interchangeable power data in the storage battery 32 at the present time is called. In step S84, it is checked whether or not it is the late-night electricity charge time zone. When it is not the midnight charge time zone, there is a possibility that high-cost charging may be performed, so that the process proceeds to step S86, and it is checked whether or not an instruction to close the B switch 36 is in progress. If applicable, the process proceeds to step S88, and the amount of charge from the single-phase three-wire commercial power supply 14 performed via the B switch 36 to the storage battery 32 is added to the data called in step S82 as inoperable, and the process proceeds to step S90. On the other hand, if it is not instructed to close the B switch 36 in step S86, the process directly proceeds to step S90.

In step S90, it is checked whether an instruction to close the A switch 34 is being issued. If applicable, the process proceeds to step S92, where the amount of charge to the storage battery 32 by the photovoltaic power generated via the A switch 34 is added to the data called in step S82 as incompatible, and the process proceeds to step S94. On the other hand, if it is not instructed to close the A switch 34 in step S90, the process directly proceeds to step S94. Further, when it is not the midnight fee time zone in step S84, the process directly proceeds to step S94.

In step S94, it is checked whether or not the storage battery 32 is being discharged. If it corresponds, the process proceeds to step S96, and it is checked whether or not an instruction to close the D switch 54 is in progress. Then, if applicable, the process proceeds to step S98, and discharge amount data for power accommodation to another home via the D switch is excluded from the accommodation calculation, and the process proceeds to step S100. This is because accommodation to other households does not correspond to consumption at home. On the other hand, if it is not instructing to close the D switch 54 in step S96, the discharge of the storage battery 32 means consumption under its own assumption, and the process directly proceeds to step S100. In step S100, the amount of discharge, that is, the amount of power consumed in the home, is subtracted from the data called in step S82 as inoperable. This means that, as a result of consuming high-cost electric power that cannot be accommodated in the home, the incompatible capacity has been reduced accordingly.

Next, in step S102, it is checked whether or not the interchangeable amount has become negative as a result of the subtraction in step S100. If the interchangeable amount becomes negative, the process proceeds to step S104, the interchangeable amount data is set to zero, and the process proceeds to step S106. This is because it is unreasonable to include more power consumption in the calculation of the added portion of the interchange as long as there is no interchangeable portion. On the other hand, if the inoperable portion does not become negative in step S102, the step directly proceeds to step S106 in order to adopt the inoperable portion of the subtraction result as it is. Note that if it is not detected in step S94 that the storage battery 32 is being discharged, there is no decrease in interchangeability, and the process directly proceeds to step S106. In step S106, the above result is stored as interchangeable data in the updated storage battery, and the flow ends.

In the above embodiment, an example is shown in which each household is in the condominium 2. However, the various features of the present invention are not limited to implementation in an apartment house such as a condominium. The same can be done on the ground. In this case, the solar power generation panel for each home is installed on the roof of each detached house.

The present invention provides a residential power supply system having a photovoltaic power generation function and a power storage function.

8 Photovoltaic power generation unit 24, 26 Power input / output unit 36, 50 Supply restriction unit 28 Control unit 32 Storage battery 42, 48 Power consumption unit 52 External storage battery 54 Supply unit 46 Distribution board

Claims (12)

A solar power generation unit, a power input / output unit that sells power from the solar power generation unit to a commercial AC power source and receives power supply from the commercial AC power source, and a storage battery that is charged by power supply from the commercial AC power source A power consuming unit that is supplied with power from the storage battery, a supply limiting unit that limits power supply from the commercial AC power source, and charging the storage battery from the commercial AC power source during a midnight power rate period If the amount of charge of the storage battery is checked, and the charging of the storage battery is not sufficient for consumption by the power consumption unit until the next midnight power charge time zone, the storage battery from the commercial AC power source is also outside the midnight power charge time zone while allowing the charge to, when the charging of the battery is sufficient to the consumption to the storage battery from the commercial AC power supply definitive other than the band midnight power rate time Power supply system, characterized in that a control unit for controlling the propriety of restriction by the feed limiting section to prohibit the charging.   2. The power supply system according to claim 1, wherein the power consuming unit is capable of receiving direct power supply from the commercial power supply when the control unit does not limit power supply by the supply limiting unit. .   The power storage system according to claim 1 or 2, wherein the storage battery can be charged by power supply from the solar power generation unit.   The power storage system according to any one of claims 1 to 3, wherein the storage battery can be charged by power supply from an external storage battery.   The power supply system according to any one of claims 1 to 4, wherein the storage battery can supply power to an external storage battery.   6. The power supply system according to claim 1, wherein the control unit limits power supply from the commercial AC power source by the supply limiting unit when the solar power generation unit is generating power. .   A storage battery that can be charged with low-cost power and high-cost power that is more expensive than this, a supply unit that supplies power stored in the storage battery to an external storage battery, and a power equivalent to charging by the high-cost power is the supply unit And a control unit that restricts supply to an external storage battery from the power supply system.   The low-cost power is power supplied from a commercial power supply during a midnight power charge time zone, and the high-cost power is power supplied from a commercial power supply outside a midnight power charge time zone. The power supply system according to claim 7.   A solar power generation unit, wherein the low-cost power is power supplied from a commercial power supply in the late-night power charge time zone, and the high-cost power is power supplied from the solar power generation unit The power supply system according to claim 7 or 8, wherein   The power consumption unit is included, and the control unit calculates a charge equivalent power charge by the high cost power in the storage battery based on the charge by the high cost power to the storage battery and the power consumption by the consumption unit from the storage battery. A power supply system according to any one of claims 7 to 9, A solar power generation unit, a power input / output unit that sells power from the solar power generation unit to a commercial AC power source and receives power supply from the commercial AC power source, and can be charged from the solar power generation unit and the commercial power source A storage battery that is charged by power supplied from an alternating current power source in the late-night electricity charge time zone, a power consumption unit that consumes power supplied from the storage battery during power sale by the solar power generation unit, and a charge amount of the storage battery If the storage battery is not sufficiently charged by the power consuming unit until the next midnight power charge time period, the storage battery is charged from the photovoltaic power generation unit even outside the midnight power charge time period. while tolerated, if the charge of the battery is sufficient to the consumption and a control unit that prohibits charging of the battery from the solar power unit definitive besides band midnight power rate time Power supply system, wherein the door.   12. The power supply system according to claim 1, wherein the control unit predicts an amount of power that can be consumed by the power consuming unit before a next midnight power charge time zone.

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