JP6920876B2 - Power supply system - Google Patents

Description

The present invention relates to a technology of a power supply system including a power generation unit capable of generating electric power using natural energy and a storage battery capable of charging and discharging electric power.

Conventionally, a technology of a power supply system having a power generation unit capable of generating electric power using natural energy and a storage battery capable of charging / discharging electric power has been known. For example, as described in Patent Document 1.

The storage battery system described in Patent Document 1 charges the storage battery with the electric power generated by the solar cell (power generation unit), and when the electric power is surplus even if the storage battery is charged with the maximum charge amount, the surplus electric power is used as a system. Reverse power flow to the power supply.

If a plurality of such storage battery systems described in Patent Document 1 are provided, the plurality of storage battery systems individually charge the storage battery or power the system according to the maximum charge amount and the power generation amount of the solar cell. It will control the reverse power flow of. In such a configuration, although one storage battery system (see the first power storage system 10 shown in FIG. 3) causes the power to flow backward due to an increase in the amount of power generation, the amount of power generation is increased in another storage battery system. The power may be insufficient due to a decrease or the like, and the storage battery (see the storage battery 22 shown in FIG. 3) may not be charged with the maximum charge amount (2000 W). As described above, in the prior art, there are cases where the electric power generated by the solar cell cannot be effectively utilized.

Japanese Unexamined Patent Publication No. 2012-44733

The present invention has been made in view of the above circumstances, and the problem to be solved is to provide a power supply system capable of effectively utilizing the power generated by the power generation unit. ..

The problem to be solved by the present invention is as described above, and next, the means for solving this problem will be described.

That is, in claim 1, the supply unit having the power generation unit capable of generating power by using natural energy and supplying the generated power to the load is connected to the electric circuit connecting the system power supply and the load. In a plurality of connected power supply systems, the supply unit is connected to the first supply unit and the system power supply side of the first supply unit, and can charge the electric power generated by the power generation unit. At the same time, a second supply unit having a storage battery capable of discharging the charged electric power and supplying the load to the load is provided, and the electric power supply system is provided from the first supply unit and the second supply unit. A detection unit that can detect the power flowing back to the system power supply and a detection unit that can acquire the detection result of the detection unit and can control the storage battery, and the detection unit reverse power flow to the system power supply. The storage battery is provided with a control unit that charges the storage battery with the electric power that flows backward when the electric power to be generated is detected . A plurality of the second supply units are connected side by side in the electric circuit, and the detection unit Each of the plurality of second supply units is arranged adjacent to the system power supply side in the electric circuit, and the control unit receives power when the detection unit detects power flowing back to the system power supply. The electric power that flows in the reverse direction is charged into the storage battery of the second supply unit adjacent to the detection unit .

In the second aspect, the control unit charges the storage battery with the maximum charge amount, the reverse power flow amount, and the power generated by the power generation unit of the second supply unit. Based on the amount, the amount of external charge, which is the amount of charging the storage battery with the reverse power flow, is determined.

In claim 3, the control unit determines the external charge amount so that the sum with the internal charge amount is maximized, with the maximum charge amount as the upper limit.

As the effect of the present invention, the following effects are exhibited.

In claim 1, the electric power generated by the power generation unit of the first supply unit can be effectively used.

In claim 2, the amount of external charge can be preferably determined.

In claim 3, the electric power generated by the power generation unit of the first supply unit can be used more effectively.

A block diagram showing a power supply system. A block diagram showing a state in which all power storage systems reverse power flow. The block diagram which showed the first state. A flowchart showing the operation of the hybrid power conditioner. The block diagram which showed the state of charging the storage battery of the 2nd power storage system with the surplus power from the 1st power storage system in the 1st state. The block diagram which showed the second state. The block diagram which showed the state of charging the storage battery of the 2nd power storage system with the surplus power from the 1st power storage system in the 2nd state. The block diagram which showed the third state. The block diagram which showed the state of charging the storage battery of the 2nd power storage system with the surplus power from the 1st power storage system in the 3rd state. The block diagram which showed the fourth state. The block diagram which showed the state of charging the storage battery of the 2nd power storage system with the surplus power from the 1st power storage system in the 4th state. The block diagram which showed the state which the surplus electric power from the 1st power storage system is charged to the storage battery of the 2nd power storage system and the 3rd power storage system.

Hereinafter, the power supply system 1 according to the embodiment of the present invention will be described.

The power supply system 1 shown in FIG. 1 supplies power from the system power supply K and power generated by using sunlight to the load H. The power supply system 1 according to the present embodiment is provided in an apartment house and supplies electric power to a load H (for example, equipment of a plurality of houses) of the apartment house. The power supply system 1 mainly includes a first power storage system 10, a second power storage system 20, a third power storage system 30, and sensors 41, 42, and 43.

The first power storage system 10 stores power generated by using sunlight and supplies it to the load H. The first power storage system 10 includes a photovoltaic power generation unit 11, a storage battery 12, and a hybrid power conditioner 13.

The photovoltaic power generation unit 11 is a device that generates electricity using sunlight. The photovoltaic power generation unit 11 is composed of a solar cell panel or the like. The photovoltaic power generation unit 11 is installed in a sunny place such as on the roof of a house, for example.

The storage battery 12 is configured to be rechargeable with electric power. The storage battery 12 is composed of, for example, a lithium ion battery. The storage battery 12 is connected to the photovoltaic power generation unit 11 via a hybrid power conditioner 13 described later. In the present embodiment, the storage battery 12 has a maximum charge amount A of 2000 W. The maximum charge amount A refers to the maximum amount of electric power that the storage battery 12 can charge per unit time.

The hybrid power conditioner 13 appropriately converts electric power (hybrid power conditioner). The hybrid power controller 13 can output the electric power generated by the photovoltaic power generation unit 11 and the electric power discharged from the storage battery 12 to the load H, and the electric power generated by the photovoltaic power generation unit 11 and the electric power from the grid power source K. Can be output to the storage battery 12. Further, the hybrid power conditioner 13 is configured to be able to acquire information on the operating state of the photovoltaic power generation unit 11 and the storage battery 12. The hybrid power conditioner 13 stores the maximum charge amount A of the storage battery 12 in a predetermined storage device. Such a hybrid power conditioner 13 is connected to the first connection point P1 of the power path L that supplies power from the system power supply K to the load H.

The hybrid power conditioner 13 of the first power storage system 10 configured in this way can switch the charge / discharge of the storage battery 12 based on the detection result of the sensor 41 described later or the like.

The second power storage system 20 is configured in the same manner as the first power storage system 10 except that the hybrid power conditioner 23 is connected to the second connection point P2 on the upstream side of the power path L from the first power storage system 10. .. Specifically, the photovoltaic power generation unit 21, the storage battery 22, and the hybrid power conditioner 23 of the second power storage system 20 correspond to the photovoltaic power generation unit 11, the storage battery 12, and the hybrid power conditioner 13 of the first power storage system 10, respectively.

The third power storage system 30 is configured in the same manner as the first power storage system 10 except that the hybrid power conditioner 33 is connected to the third connection point P3 on the upstream side of the power path L from the second power storage system 20. .. Specifically, the photovoltaic power generation unit 31, the storage battery 32, and the hybrid power conditioner 33 of the third power storage system 30 correspond to the photovoltaic power generation unit 11, the storage battery 12, and the hybrid power conditioner 13 of the first power storage system 10, respectively.

The sensor 41 is provided between the first connection point P1 and the second connection point P2 in the power path L. Further, the sensor 41 is provided so as to be adjacent to the upstream side (system power supply K side) of the first connection point P1 (so that other connection points or the like do not intervene). The sensor 41 detects the voltage (supply voltage) and the current (supply current) of the electric power (for example, the electric power supplied to the load H and the storage battery 12) flowing through the provided portion. The sensor 41 is connected to the hybrid power conditioner 13 of the first power storage system 10 and is configured to be able to output a signal related to the detection result to the hybrid power conditioner 13.

The sensor 42 is configured in the same manner as the sensor 41 except that it is provided between the second connection point P2 and the third connection point P3 and is connected to the hybrid power conditioner 23 of the second power storage system 20. The sensor 42 is provided so as to be adjacent to the upstream side of the second connection point P2.

The sensor 43 is configured in the same manner as the sensor 41 except for a point provided between the third connection point P3 and the system power supply K and the hybrid power conditioner 33 of the third power storage system 30. The sensor 43 is provided so as to be adjacent to the upstream side of the third connection point P3.

Hereinafter, in the power supply system 1 configured as described above, the flow of supplying power to the storage batteries 12, 22, 32 and the load H will be briefly described.

The electric power from the grid power supply K and the photovoltaic power generation units 11 ・ 21 ・ 31 is supplied to the load H via the electric power path L. In this way, the resident of the house can turn on the lights and use the cooking utensils and the air conditioner by using the system power supply K and the electric power from the solar power generation units 11.21.31.

In this case, if the power consumption of the load H can be covered by the power from the photovoltaic power generation units 11, 21, and 31, it is possible not to use the power from the grid power source K. In this way, the amount of power purchased from the grid power supply K can be reduced, and the power charge can be saved.

Further, the electric power from the grid power supply K and the solar power generation units 11 ・ 21 ・ 31 can be supplied to the storage batteries 12 ・ 22 ・ 32 at an appropriate time zone. The electric power supplied to the storage batteries 12/22/32 can be charged to the storage batteries 12/22/32. The time zone in which the storage batteries 12, 22 and 32 are charged can be set arbitrarily by the resident. For example, if the time zone is set to midnight, the storage batteries 12/22/32 can be charged with low-priced midnight electricity. Further, if the time zone is set to the daytime time zone, the electric power from the photovoltaic power generation units 11 ・ 21 ・ 31 can be charged to the storage batteries 12 ・ 22 ・ 32.

Further, the electric power charged in the storage batteries 12, 22 and 32 can be supplied to the load H via the electric power path L. Specifically, when the storage batteries 12, 22, and 32 are discharged, the discharged electric power is supplied to the load H via the power path L. The time zone in which the storage batteries 12, 22 and 32 are discharged can be set arbitrarily by the resident. For example, if the time zone is set to the daytime time zone, the low-priced midnight electricity charged in the storage batteries 12, 22, and 32 can be used in the daytime time zone. In this way, the amount of electric power (the amount of electric power purchased) from the grid power supply K can be reduced during the daytime, and the electric power charge can be saved.

In supplying electric power to the load H, the hybrid power conditioner 13, 23, 33 performs a load follow-up operation for determining the discharge amount of the storage batteries 12, 22, and 32 based on the detection results of the sensors 41, 42, and 43. ..

Next, the power supply mode (mode) in the power supply system 1 will be described.

The electric power supply system 1 has an eco mode or the like as an electric power supply mode.

The eco-mode is a mode for the purpose of consuming the electric power generated by the photovoltaic power generation units 11, 21, and 31 at the load H (obtaining an energy saving effect by consuming the electric power at the load H). As shown in FIG. 2, the hybrid power conditioner 13, 23, 33 in which the eco mode is set is the solar power generation unit 11.21.31 when power is being generated by the solar power generation unit 11.21.31. The power from 31 is supplied to the load H. Further, in the hybrid power conditioner 13, 23, 33, when the electric power (4000 W each) from the photovoltaic power generation units 11/21/31 is surplus with respect to the power consumption (1000 W) of the load H, the surplus electric power is used as the storage battery 12.22. -Charge to 32. The hybrid power conditioners 13, 23, and 33 have a surplus when the power from the photovoltaic power generation units 11, 21, and 31 is still surplus even after charging the storage batteries 12, 22, and 32 with the maximum charge amount A (2000 W, respectively). The power is reverse-flowed to the grid power supply K. As a result, 1000 W of electric power is reverse-flowed in the first power storage system 10 shown in FIG. 2, and 2000 W of power is reverse-flowed in the second power storage system 20 and the third power storage system 30.

When the storage batteries 12/22/32 are fully charged, the hybrid power conditioner 13/23/33 in which the eco-mode is set stops charging the storage batteries 12/22/32 and is surplus with respect to the power consumption of the load H. All the generated power is reverse-flowed to the grid power supply K. Further, when the power from the photovoltaic power generation units 11/21/31 is insufficient for the power consumption of the load H, the hybrid power conditioner 13/23/33 discharges the storage batteries 12/22/32 and the storage batteries 12/22. -The power from 32 is supplied to the load H.

Here, when the amount of power generated by the photovoltaic power generation units 11 ・ 21 ・ 31 and the remaining amount of the storage batteries 12 ・ 22 ・ 32 vary from the first power storage system 10 to the third power storage system 30 due to the difference in the installation location or the like. There is. Due to such variations in the amount of power generation and the remaining amount of power, in some power storage systems, the surplus power of the photovoltaic power generation unit is reverse-flowed to the load H and the storage battery, whereas in other power storage systems, the load H In addition, the power of the photovoltaic power generation unit may be insufficient for the storage battery.

FIG. 3 is a diagram illustrating a power storage system in which power is surplus for the load H and the storage battery, and a power storage system in which power is insufficient. The first power storage system 10 shown in FIG. 3 corresponds to a power storage system with surplus power, and the surplus 1000 W of power is reverse-flowed to the load H and the storage battery 12. Further, the third power storage system 30 also corresponds to a power storage system with surplus power, and the surplus 2000 W of power is reverse-flowed to the storage battery 32. On the other hand, the second power storage system 20 corresponds to a power storage system in which electric power is insufficient, and the amount of power generated by the photovoltaic power generation unit 21 is smaller than that of the other photovoltaic power generation units 11 and 31, and the storage battery 22 is charged with the maximum charge amount A. There is not enough power of 500W to charge it.

The power supply system 1 according to the present embodiment performs the surplus power charging process shown in FIG. 4 to transfer the power (surplus power) reverse power flow from the surplus power storage system to the storage battery of the power storage system lacking power. It is charged and the surplus power is consumed in the power supply system 1 as much as possible.

Hereinafter, the surplus power charging process will be described with reference to FIGS. 3 to 12.

The surplus power charging process is repeatedly executed independently for each of the hybrid power conditioners 13, 23, and 33. In the following, a case where the hybrid power conditioner 23 performs the surplus power charging process will be described as an example. Further, in the following, it is assumed that the eco mode is set for the hybrid power conditioner 23.

The hybrid power conditioner 23 charges the storage battery 22 with surplus power from the first power storage system 10 arranged on the load H side (downstream side) when a predetermined condition is satisfied by the surplus power charging process shown in FIG. ..

As shown in FIG. 4, first, in step S10, the hybrid power conditioner 23 confirms whether or not it is in the power purchase state. The power purchase state according to the present embodiment refers to a state in which power is circulated from the system power supply K side toward the connection portion (second connection point P2) between the hybrid power conditioner and the power path L. The hybrid power conditioner 23 determines whether or not the power is being purchased based on the detection result of the sensor 42. The hybrid power conditioner 23 proceeds to step S20 when it is determined that the power is being purchased. On the other hand, the hybrid power conditioner 23 proceeds to step S40 when it is determined that the power is not purchased.

In step S20, the hybrid power conditioner 23 confirms whether or not the storage battery 22 is charged with the electric power flowing through the electric power path L (second connection point P2). The hybrid power conditioner 23 proceeds to step S30 when the storage battery 22 is charged with the electric power flowing through the electric power path L. On the other hand, the hybrid power conditioner 23 ends the surplus power charging process when the storage battery 22 is not charged with the power flowing through the power path L.

In step S30, the hybrid power conditioner 23 stops charging the storage battery 22 with the electric power flowing through the electric power path L. Here, since the hybrid power conditioner 23 purchases electric power from the grid power supply K, the electric power is distributed from the grid power supply K side to the second connection point P2 (in the power purchase state), and the process proceeds to step S30. In some cases. In such a case, if the storage battery 22 is charged with the electric power flowing through the electric power path L, the amount of electric power purchased from the system power supply K increases. Therefore, the hybrid power conditioner 23 performs the process of step S30 (stops charging from the power path L) so that the amount of power purchased from the grid power supply K in the eco mode does not increase as much as possible. When the process of step S30 is completed, the hybrid power conditioner 23 ends the surplus power charging process.

In step S40, the hybrid power conditioner 23 confirms whether or not the power is being sold. The power selling state according to the present embodiment refers to a state in which power is circulated from the connection portion (second connection point P2) between the hybrid power conditioner to be processed and the power path L toward the system power supply K side. The hybrid power conditioner 23 determines whether or not the power is sold based on the detection result of the sensor 42. When the hybrid power conditioner 23 determines that the power is being sold, the hybrid power conditioner 23 proceeds to step S50. On the other hand, when the hybrid power conditioner 23 determines that the power is not sold, it determines that the storage battery 22 does not have surplus power that can be charged, and ends the surplus power charging process.

In step S50, the hybrid power conditioner 23 confirms whether or not the charge amount from the photovoltaic power generation unit 21 to the storage battery 22 (hereinafter, referred to as “in-system charge amount C”) is the same value as the maximum charge amount A. do. The hybrid power conditioner 23 charges the storage battery 22 with surplus power from the first power storage system 10 when the charge amount C in the system is the same value as the maximum charge amount A (when charging with the maximum charge amount A). Judging that it is not necessary to do so, the surplus power charging process is terminated. On the other hand, when it is determined that the charge amount C in the system is not the same value as the maximum charge amount A, the hybrid power conditioner 23 is in a power sale state when the sensor 42 detects the surplus power from the first power storage system 10. Judge that In this case, the hybrid power conditioner 23 determines that the storage battery 22 has surplus power from the first power storage system 10 that can be charged, and proceeds to step S60.

In step S60, the hybrid power conditioner 23 starts the surplus power charging mode preset in the eco mode. The surplus power charging mode is a mode (a part of the eco mode) in which the surplus power from the first power storage system 10 is charged during the eco mode. When the hybrid power conditioner 23 starts the surplus power charging mode, the hybrid power conditioner 23 performs the processes from step S60 to S130 described later.

The hybrid power conditioner 23 switched to the surplus power charging mode first confirms in step S60 whether or not the in-system charge amount C is larger than 0 and less than the maximum charge amount A. The hybrid power conditioner 23 determines that the surplus power from the first power storage system 10 can be charged to the storage battery 22 when the charge amount C in the system is larger than 0 and less than the maximum charge amount A, and step S70. Move to. On the other hand, the hybrid power conditioner 23 shifts to step S100 when the charge amount C in the system is 0 or less or the maximum charge amount A or more.

The in-system charge amount C is a value in the range between 0 or more and the maximum charge amount A or less, and the in-system charge amount C is the same value as the maximum charge amount A in the range. In that case, the process does not proceed to step S60. Therefore, when the charge amount C in the system is 0, the process proceeds to step S100.

In step S70, in the hybrid power conditioner 23, the amount of power that is reverse power flowed from the first power storage system 10 (downstream side) (hereinafter referred to as “power sale amount B”) is obtained by subtracting the in-system charge amount C from the maximum charge amount A. It is confirmed whether or not it is larger than the value (the amount of power required to charge with the maximum charge amount A). In step S70, the power from the photovoltaic power generation unit 21 is insufficient to charge the storage battery 22 with the maximum charge amount A (the second power storage system 20 does not reverse power flow). Only the surplus power from the first power storage system 10 is distributed to the connection point P2. The hybrid power conditioner 23 determines the amount of electricity sold B based on the detection result of the sensor 42. The hybrid power conditioner 23 proceeds to step S80 when the power sale amount B is larger than the value obtained by subtracting the in-system charge amount C from the maximum charge amount A. On the other hand, the hybrid power conditioner 23 shifts to step S90 when the power sale amount B is equal to or less than the subtracted value.

In step S80, the hybrid power conditioner 23 charges the storage battery 22 with the electric power flowing through the power path L while continuing to charge the storage battery 22 from the photovoltaic power generation unit 21. As a result, the hybrid power conditioner 23 can increase the charge amount of the storage battery 22 by using the surplus electric power from the first power storage system 10. Further, the hybrid power conditioner 23 determines the amount of power obtained by subtracting the amount of charge C in the system from the maximum amount of charge A as the amount of charge to the storage battery 22 from the power path L (hereinafter, referred to as "charge amount D outside the system"). .. According to this, since the sum of the in-system charge amount C and the out-of-system charge amount D is the maximum charge amount A, the storage battery 22 can be charged with the maximum charge amount A. When the process of step S80 is completed, the hybrid power conditioner 23 ends the surplus power charging process.

The hybrid power conditioner 23 performs the process of step S80, for example, when the process is performed in the first state shown in FIG. In the first state, 1000 W of electric power is reverse power flowed from the first power storage system 10. Further, in the second power storage system 20, the storage battery 22 is charged with 1500 W of electric power generated by the solar power generation unit 21. That is, in the first state, the amount of electricity sold B is 1000 W, and the amount of charge C in the system is 1500 W. Further, 500 W of electric power is insufficient to charge the storage battery 22 with the maximum charge amount A.

In such a state, the hybrid power conditioner 23 determines that the power is being sold based on the detection result (1000 W) of the sensor 42, and proceeds to step S50 (step S10: NO, step S40: YES). Then, the hybrid power conditioner 23 shifts to step S70 based on the in-system charge amount C (1500 W) and the maximum charge amount A (2000 W) (step S50: NO, step S60: YES). After that, the hybrid power conditioner 23 determines that the power sale amount B (1000 W) is larger than the value (500 W) obtained by subtracting the in-system charge amount C from the maximum charge amount A, and proceeds to step S80 (step S70: YES). The hybrid power conditioner 23 determines 500 W, which is obtained by subtracting the in-system charge amount C from the maximum charge amount A, as the out-of-system charge amount D. According to this, as shown in FIG. 5, the hybrid power conditioner 23 uses a part of the surplus electric power (500 W) and the electric power from the photovoltaic power generation unit 21 (1500 W) to charge the storage battery 22 with the maximum charge amount A (2000 W). ) Can be charged.

As shown in FIG. 4, in step S90, the hybrid power conditioner 23 charges the storage battery 22 from the power path L while continuing to charge the storage battery 22 from the photovoltaic power generation unit 21. As a result, the hybrid power conditioner 23 charges the storage battery 22 with all the surplus power from the first power storage system 10. According to this, the hybrid power conditioner 23 can increase the charge amount of the storage battery 22 as much as possible by using the surplus electric power from the first power storage system 10. When the process of step S90 is completed, the hybrid power conditioner 23 ends the surplus power charging process.

The hybrid power conditioner 23 performs the process of step S90, for example, when the process is performed in the second state shown in FIG. In the second state, 1000 W of electric power is reverse-flowed from the first power storage system 10. Further, in the second power storage system 20, the storage battery 22 is charged with 500 W of electric power generated by the solar power generation unit 21. That is, in the second state, the amount of electricity sold B is 1000 W and the amount of charge C in the system is 500 W. Further, 1500 W of electric power is insufficient to charge the storage battery 22 with the maximum charge amount A.

In such a second state, the hybrid power conditioner 23 proceeds to step S70 based on the detection result of the sensor 42 and the like (step S10: NO, step S40: YES, step S50: NO, step S60: YES). Then, the hybrid power conditioner 23 determines that the power sale amount B (1000 W) is equal to or less than the power amount (1500 W) obtained by subtracting the charge amount C in the system from the maximum charge amount A, and proceeds to step S90 (step S70: NO). .. The hybrid power conditioner 23 determines the amount of electricity sold B (1000 W) to be the amount of charge D outside the system. According to this, as shown in FIG. 7, the hybrid power conditioner 23 can increase the charge amount of the storage battery 22 from 500 W to 1500 W by using all the surplus power of the first power storage system 10.

As shown in FIG. 4, in step S100, which shifts to the case where the charge amount C in the system is 0, the hybrid power conditioner 23 confirms whether or not the remaining amount of the storage battery 22 is 100%. When the remaining amount of the storage battery 22 is 100%, the hybrid power conditioner 23 determines that it is not necessary to charge the storage battery 22, and ends the surplus power charging process. On the other hand, the hybrid power conditioner 23 determines that it is necessary to charge the storage battery 22 with the surplus power from the first power storage system 10 when the remaining amount of the storage battery 22 is not 100%, and proceeds to step S110.

In step S110, the hybrid power conditioner 23 confirms whether or not the amount of electricity sold B is equal to or greater than the maximum amount of charge A. In step S110, since the charge amount C in the system is 0 (the solar power generation unit 21 does not generate power), only the surplus power from the first power storage system 10 is distributed to the second connection point P2. doing. The hybrid power conditioner 23 determines the amount of electricity sold B based on the detection result of the sensor 42. The hybrid power conditioner 23 shifts to step S120 when the power selling amount B is equal to or more than the maximum charge amount A. On the other hand, the hybrid power conditioner 23 shifts to step S130 when the power selling amount B is less than the maximum charge amount A.

In step S120, the hybrid power conditioner 23 charges the storage battery 22 from the power path L with the maximum charge amount A. As a result, the hybrid power conditioner 23 can charge the storage battery 22 with the maximum charge amount A using the surplus power from the first power storage system 10 even if the solar power generation unit 21 is not generating power. When the process of step S120 is completed, the hybrid power conditioner 23 ends the surplus power charging process.

The hybrid power conditioner 23 performs the process of step S120, for example, when the process is performed in the third state shown in FIG. In the third state, 2000 W of electric power is reverse power flowed from the first power storage system 10. Further, in the second power storage system 20, although the solar power generation unit 21 does not generate power, the remaining amount of the storage battery 22 is not 100%. That is, in the third state, the amount of electricity sold B is 2000 W and the amount of charge C in the system is 0 W. Further, 2000 W of electric power is insufficient to charge the storage battery 22 with the maximum charge amount A.

In such a third state, the hybrid power controller 23 shifts to step S110 based on the detection result of the sensor 42, the in-system charge amount C (0 W), the maximum charge amount A (2000 W), and the remaining amount of the storage battery 22 ( Step S10: NO, step S40: YES, step S50: NO, step S60: NO, step S100: NO). Then, the hybrid power conditioner 23 determines that the power sales amount B (2000W) is equal to or greater than the maximum charge amount A (2000W), and proceeds to step S120 (step S110: YES). The hybrid power conditioner 23 determines the maximum charge amount A (2000 W) as the charge amount D outside the system. According to this, as shown in FIG. 9, the hybrid power conditioner 23 can charge the storage battery 22 with the maximum charge amount A (2000 W) using the surplus electric power (2000 W).

As shown in FIG. 4, in step S130, the hybrid power conditioner 23 charges the storage battery 22 from the power path L with the power sale amount B. As a result, the hybrid power conditioner 23 charges the storage battery 22 with all the surplus power from the first power storage system 10. According to this, the hybrid power conditioner 23 can increase the charge amount of the storage battery 22 as much as possible by using the surplus electric power from the first power storage system 10. When the process of step S130 is completed, the hybrid power conditioner 23 ends the surplus power charging process.

The hybrid power conditioner 23 performs the process of step S130, for example, when the process is performed in the fourth state shown in FIG. In the fourth state, 1000 W of electric power is reverse power flowed from the first power storage system 10. Further, in the second power storage system 20, although the solar power generation unit 21 does not generate power, the remaining amount of the storage battery 22 is not 100%. That is, in the fourth state, the amount of electricity sold B is 1000 W and the amount of charge C in the system is 0 W. Further, 2000 W of electric power is insufficient to charge the storage battery 22 with the maximum charge amount A.

In such a fourth state, the hybrid power conditioner 23 proceeds to step S110 based on the detection result of the sensor 42 and the like (step S10: NO, step S40: YES, step S50: NO, step S60: NO, step S100). : NO). Then, the hybrid power conditioner 23 determines that the power sale amount B (1000W) is less than the maximum charge amount A (2000W), and proceeds to step S130 (step S110: NO). The hybrid power conditioner 23 determines the amount of electricity sold B (1000 W) to be the amount of charge D outside the system. According to this, as shown in FIG. 11, the hybrid power conditioner 23 can increase the charge amount of the storage battery 22 from 0 W to 1000 W by using all the surplus power of the first power storage system 10.

As described above, in the power supply system 1, when there is a power storage system with surplus power (step S10: NO, step S40: YES), reverse power flow from the power storage system with surplus power in the storage battery of the power storage system with insufficient power. The generated electric power is charged (steps S80, S90, S120, S130). According to this, since the power of the power storage system with surplus power can be transferred to the power storage system with insufficient power, the power generated by the photovoltaic power generation units 11 ・ 21 ・ 31 can be effectively utilized. ..

Further, the power supply system 1 determines the amount of surplus power to be charged to the storage batteries 12/22/32 based on the maximum charge amount A, the power sale amount B, and the charge amount C in the system (step S80). -S90, S120, S130). According to this, since the power supply system 1 can grasp to what extent the surplus power can be charged, the out-of-system charge amount D can be suitably determined. As a result, for example, it is possible to suppress the occurrence of a situation in which the out-of-system charge amount D (for example, 1500 W) exceeds the power sale amount B (for example, 500 W) and power is purchased from the system power supply K.

Further, the power supply system 1 uses surplus power to charge the storage batteries 12, 22, and 32 with the maximum charge amount A if possible (steps S80, S90, S120). Further, the power supply system 1 charges the storage batteries 12/22/32 with all of the surplus power when the storage batteries 12/22/32 cannot be charged with the maximum charge amount A using the surplus power (step). S90 / S130). As described above, the power supply system 1 charges the storage batteries 12, 22, and 32 as much as possible with the surplus power. According to this, the electric power supply system 1 can more effectively utilize the electric power generated by the photovoltaic power generation units 11.21.31.

Further, the power supply system 1 uses sensors 41, 42, and 43 provided on the upstream side of the connection points P1 to P3 to charge the storage batteries 12, 22, and 32 with surplus power. According to this, the power supply system 1 can perform the surplus power charging process by using the sensors 41, 42, and 43 for the load following operation. As a result, the power supply system 1 can reduce the number of parts and reduce the cost.

In the present embodiment, the processing has been described by taking the hybrid power conditioner 23 of the second power storage system 20 as an example, but the hybrid power conditioners 13 and 33 of the first power storage system 10 and the third power storage system 30 are also referred to as the hybrid power conditioner 23. Similarly, the processes of steps S10 to S130 are performed.

As a result, as shown in FIG. 12, the hybrid power conditioner 33 of the third power storage system 30 arranged on the most upstream side transfers the surplus power (2000 W) from the first power storage system 10 to the storage battery 22 of the second power storage system 20. If there is still surplus power after charging, the surplus power can be used to charge the storage battery 32.

In the first power storage system 10 arranged on the most downstream side, surplus power does not circulate from the downstream side of the first connection point P1. In such a first power storage system 10, there is a surplus of power even if the storage battery 12 is charged with the maximum charge amount A by the power from the photovoltaic power generation unit 11 (step S50: YES), or the remaining amount of the storage battery 12 is 100. When it is% (step S100: NO), the power is sold. Therefore, the first power storage system 10 ends the surplus power charging process without shifting to the process of charging the storage battery 12 (steps S80, S90, S120, S130).

As described above, the electric power supply system 1 according to the present embodiment can generate electric power by using natural energy, and can supply the generated electric power to the load H. 2. (1) Supply unit) and the system power supply K side of the first power storage system 10, and the electric power generated by the solar power generation units 11 ・ 21 ・ 31 can be charged and the charged electric power can be charged. The power supply system 1 includes a second power storage system 20 and a third power storage system 30 (second supply unit) having storage batteries 22 and 32 capable of discharging the power and supplying the power to the load H. Sensors 42.43 (detection unit) that can detect the electric power that flows backward from the first power storage system 10 to the system power supply K, and the storage batteries 22.32 that can acquire the detection results of the sensors 42.43. When the sensors 42 and 43 detect the power that flows backward to the system power supply K, the hybrid power controllers 23 and 33 that charge the storage batteries 22 and 32 with the power that flows backward. (Control unit) and.

With this configuration, the electric power reverse power flowed from the solar power generation unit 11 of the first power storage system 10 can be charged to the storage batteries 22 and 32 of the second power storage system 20 and the third power storage system 30, so that the photovoltaic power generation can be performed. The electric power generated by the unit 11 can be effectively used.

Further, the hybrid power capacitors 23 and 33 include a maximum charge amount A of the storage batteries 22 and 32, a power sale amount B (reverse power flow amount), and sunlight of the second power storage system 20 and the third power storage system 30. Based on the in-system charge amount C (internal charge amount), which is the amount of charging the electric power generated by the power generation units 21 and 31 to the storage batteries 22 and 32, the reverse power is charged to the storage batteries 22 and 32. It determines the amount of charge D (external charge amount) outside the system, which is the amount to be charged.

With this configuration, the out-of-system charge amount D can be suitably determined.

Further, the hybrid power conditioners 23 and 33 determine the out-of-system charge amount D so that the sum with the in-system charge amount C is maximized with the maximum charge amount A as the upper limit.

With this configuration, the electric power that is reversely flowed from the photovoltaic power generation unit 11 of the first power storage system 10 can be charged to the storage batteries 22 and 32 of the second power storage system 20 and the third power storage system 30 as much as possible. , The electric power generated by the photovoltaic power generation unit 11 can be utilized more effectively.

Further, the second power storage system 20 and the third power storage system 30 are connected side by side in the power path L, and the sensors 42 and 43 are connected to the second power storage system 20 and the third power storage system 30 in the power path L. The hybrid power controllers 23 and 33 are arranged so as to be adjacent to the system power supply K side of the above, and when the sensors 42 and 43 detect the power to be reverse power flowed to the system power supply K, the sensors 42. The storage batteries 22 and 32 of the second power storage system 20 and the third power storage system 30 adjacent to the 43 are charged with the reverse power flow.

With this configuration, the surplus power from the first power storage system 10 that is still left over after charging the storage battery 22 of the second power storage system 20 on the downstream side is transferred to the storage battery 32 of the third power storage system 30 on the upstream side. It can be charged. As a result, the electric power generated by the photovoltaic power generation unit 11 of the first power storage system 10 can be utilized more effectively.

The solar power generation unit 11.21.31 according to the present embodiment is an embodiment of the power generation unit according to the present invention.
Further, the first power storage system 10 according to the present embodiment is an embodiment of the first supply unit according to the present invention.
Further, the second power storage system 20 and the third power storage system 30 according to the present embodiment are one embodiment of the second supply unit according to the present invention.
Further, the sensors 42 and 43 according to the present embodiment are one embodiment of the detection unit according to the present invention.
Further, the hybrid power conditioners 23 and 33 according to the present embodiment are one embodiment of the control unit according to the present invention.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above configuration, and various modifications can be made within the scope of the invention described in the claims.

For example, the power supply system 1 is provided in an apartment house, but is not limited to this, and may be provided in an office or the like, for example.

Further, in the present embodiment, the number of power storage systems is set to 3, but the number is not limited to this, and any number of 2 or more can be used.

Further, the first power storage system 10 does not necessarily have to include the storage battery 12.

Further, the hybrid power conditioner 13 of the first power storage system 10 does not necessarily have to perform the surplus power charging process.

Further, in the present embodiment, the second power storage system 20 has a configuration capable of charging the power reverse-flowed from the first power storage system 10 (that is, one power storage system), but the power from a plurality of power storage systems Can be charged. That is, not only the second supply unit according to the present invention but also the first supply unit may be connected to a plurality of power paths L.

Further, the first power storage system 10 to the third power storage system 30 may be configured to include a power generation device (for example, a fuel cell) that generates power using a predetermined fuel.

Further, the power generation unit is assumed to be a photovoltaic power generation unit 11.21.31 that generates power using sunlight, but if it generates power using natural energy (for example, hydraulic power or wind power), it is assumed. It is not limited to this.

Further, in the hybrid power conditioners 23 and 33, in steps S90 and S130, all the surplus electric power is charged to the storage batteries 22 and 32, but the present invention is not limited to this. In steps S90 and 130, for example, the hybrid power conditioners 23 and 33 may charge the storage batteries 22 and 32 with a part of the surplus electric power.

Further, in the present embodiment, the charging of the storage batteries 22 and 32 is controlled by the hybrid power conditioners 23 and 33, but the charging is not limited to this, and for example, the storage battery 22 is used by using EMS (Energy Management System). • 32 charging may be controlled.

1 Power supply system 10 First power storage system (first supply unit)
11.21.31 Solar power generation department (power generation department)
20 Second power storage system (second supply unit)
22/32 Storage battery 23/33 Hybrid power conditioner (control unit)
30 Third power storage system (second supply unit)
42.43 Sensor (detector)
H load K system power supply L power path (electric circuit)

Claims (3)

In a power supply system in which a plurality of power supply units having a power generation unit capable of generating power using natural energy and supplying the generated power to a load are connected to an electric circuit connecting the system power supply and the load. There,
The supply unit
First supply department and
It further has a storage battery that is connected to the system power supply side of the first supply unit, can charge the electric power generated by the power generation unit, and can discharge the charged electric power to supply the load to the load. With the second supply department
Equipped with
The power supply system
A detection unit capable of detecting power flowing back from the first supply unit and the second supply unit to the system power supply, and a detection unit.
The storage battery is configured so that the detection result of the detection unit can be acquired and the storage battery can be controlled. With a control unit that charges the battery
Equipped with
The second supply unit
Multiple connections are made side by side in the electric circuit.
The detection unit
In the electric circuit, each of the plurality of second supply units is arranged so as to be adjacent to the system power supply side.
The control unit
When the detection unit detects the power that is reverse power flowed to the system power supply, the storage battery of the second supply unit adjacent to the detection unit is charged with the power that is reverse power flow.
Power supply system. The control unit
Reverse power flow is performed based on the maximum charge amount of the storage battery, the amount of power that is reverse power flow, and the internal charge amount that is the amount of charging the power generated by the power generation unit of the second supply unit to the storage battery. An external charge amount, which is an amount for charging the storage battery with electric power, is determined.
The power supply system according to claim 1. The control unit
The external charge amount is determined so that the sum with the internal charge amount is maximized with the maximum charge amount as the upper limit.
Power supply system according to請Motomeko 2.

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