JP6432099B2 - Power supply system - Google Patents

Description

  The present invention relates to a technology of a power supply system including a solar power generation unit capable of generating power by receiving sunlight, and a power storage device capable of charging / discharging electric power from a commercial power source and the solar power generation unit.

  2. Description of the Related Art Conventionally, a technology of a power supply system including a solar power generation unit that can generate power by receiving sunlight, and a power storage device that can charge and discharge electric power from a commercial power source and the solar power generation unit has become known. Yes. For example, as described in Patent Document 1.

  In the technology described in Patent Document 1, the power supply system (storage battery system) includes a solar power generation unit capable of generating power by receiving sunlight, and a power storage capable of charging and discharging power from the commercial power source and the solar power generation unit. An apparatus. With such a configuration, the power supply system can supply power generated by the solar power generation unit, power from a commercial power source, and power charged in the power storage device to the load.

  However, in the power supply system, since there are a plurality of devices that can supply power to the load as described above, when each device or the like tries to supply power to the load without any restrictions, This is a problem in that the power supplied from one device or the like interferes with the power supplied from another device or the like. Further, if the amount of power generated by the solar power generation unit is larger than the amount of power consumed by the load, it is preferable that the surplus power not consumed by the load is used for selling power or charging the power storage device. If there is such surplus power when there is little remaining power in the power storage device and it is desired to charge the power storage device, it is sufficient if the power storage device can be charged with this surplus power, but if the device is operating without any control, Considering that the surplus power is sold, it is not possible to sufficiently charge the power storage device with the surplus power, and it is not possible to secure a sufficient power storage amount until the charging start time such as at night.

JP2012-085402A

  The present invention has been made in view of the above situation, and a problem to be solved is to provide a power supply system capable of efficiently supplying power from a plurality of devices or the like to a load. It is.

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

That is, in claim 1, the solar power generation unit capable of generating power by receiving sunlight and a commercial power source and the solar power generation unit and the load are sequentially connected between the commercial power source and the commercial power source. And a power storage device capable of charging and discharging power from the commercial power source and the solar power generation unit, and a sensor unit for detecting information on power at a predetermined position, and the solar power generation unit The power supply system supplies power from the commercial power source and the power storage device to the load, wherein the sensor unit detects a power supplied from the solar power generation unit, and the commercial power source And a second sensor provided between the commercial power source and the connecting portion with the solar power generation unit, and a power distribution line connecting the power storage device, As supply mode, arbitrarily A first mode and a second mode that can be selected. In the first mode, when it is determined that the photovoltaic power generation unit is generating power based on the detection result of the first sensor, Charging the power storage device based on the detection result of the second sensor so that the first power amount is supplied from the commercial power source, charging the predetermined power amount, In the second mode, when it is determined that the photovoltaic power generation unit is generating power based on the detection result of the first sensor, the standby state in which the power storage device is not discharged regardless of the detection result of the second sensor. By doing so, it is impossible to discharge the power storage device.

  According to claim 2, in the first mode, it is determined that the photovoltaic power generation unit is generating power based on a detection result of the first sensor, and the solar power generation unit The power storage device is charged when a surplus occurs in the power supplied to the load.

In Claim 3 , The said sensor part comprises the 3rd sensor provided in the said distribution line between the connection part with the said photovoltaic power generation part, and the connection part with the said load, Said 1st In the mode and the second mode, when it is determined that the photovoltaic power generation unit is not generating power based on the detection result of the first sensor, the load is consumed based on the detection result of the third sensor. The electric power to be discharged is discharged from the power storage device.

According to a fourth aspect of the present invention, in the first mode, when the amount of electric power supplied from the commercial power source is smaller than the first electric energy, the amount of electric power charged in the power storage device is increased. Thus, the amount of electric power supplied from the commercial power supply is controlled to be the first electric energy.

In claim 5 , in the first mode, when the amount of power supplied from the commercial power source is equal to or greater than a second power amount set as a power amount larger than the first power amount, By discharging the power storage device and supplying a predetermined amount of power to the load, control is performed so that the amount of power supplied from the commercial power source is the first power amount.

  As effects of the present invention, the following effects can be obtained.

  In the present invention, an energy saving effect can be obtained, and power can be efficiently supplied from a plurality of devices or the like with respect to the load. In addition to obtaining an energy saving effect, it is possible to select to obtain a monetary profit.

The block diagram which showed the structure of the electric power supply system which concerns on one Embodiment of this invention. Similarly, the block diagram which showed the supply aspect of the electric power in the 2nd mode of an electric power supply system. Similarly, the flowchart which showed the supply mode of the electric power in the 2nd mode of an electric power supply system. Similarly, the block diagram which showed the supply aspect of the electric power in the 1st mode of an electric power supply system. Similarly, the flowchart which showed the supply aspect of the electric power in the 1st mode of an electric power supply system. Similarly, the block diagram which showed an example of the supply mode of the electric power in the 1st mode of an electric power supply system. Similarly, the block diagram which showed an example of the supply mode of the electric power in the 1st mode of an electric power supply system. Similarly, the block diagram which showed an example of the supply mode of the electric power in the 1st mode of an electric power supply system.

  Below, the structure of the electric power supply system 1 which concerns on embodiment of this invention is demonstrated using FIG.

  The power supply system 1 is provided in a house or the like, and supplies power from a commercial power source 50 and power generated using sunlight to the home load 40. The power supply system 1 mainly includes a solar power generation unit 10, a power storage device 20, and a sensor unit 30.

  The solar power generation unit 10 is a device that generates power using sunlight. The solar power generation unit 10 is configured by a solar cell panel or the like. The photovoltaic power generation unit 10 is installed in a sunny place such as on the roof of a house.

  The power storage device 20 is a device configured to be able to charge and discharge power from the commercial power supply 50 and the solar power generation unit 10. The power storage device 20 includes a storage battery composed of a lithium ion battery or a nickel metal hydride battery that can charge and discharge power, a charger that rectifies supplied AC power and charges the storage battery, and direct current power from the storage battery. An inverter for converting to AC power and outputting it is provided.

  In addition, the power storage device 20 includes a control unit 21. The control unit 21 controls the charger, the inverter, and the like, and thus controls charging / discharging of the power storage device 20. The control unit 21 is mainly configured by an arithmetic processing device such as a CPU, a storage device such as a RAM and a ROM, and an input / output device such as an I / O. The control unit 21 is built in the power storage device 20. The control unit 21 can acquire information about the power charged / discharged in the power storage device 20.

  The commercial power supply 50 and the photovoltaic power generation unit 10 are electrically connected to the home load 40 and the power storage device 20 via a distribution board (not shown). The distribution board is a collection of an earth leakage breaker, a wiring breaker, a control unit, and the like (not shown). The distribution board is configured to be able to switch whether or not power can be supplied to the household load 40.

  The sensor unit 30 detects power information at a predetermined position of the circuit. The sensor unit 30 includes a first sensor 31, a second sensor 32, and a third sensor 33.

  The 1st sensor 31 is provided in the supply side (distribution line which supplies the electric power from the photovoltaic power generation part 10 to a house) of the photovoltaic power generation part 10. FIG. The first sensor 31 can detect the electric power from the solar power generation unit 10. First sensor 31 is electrically connected to power storage device 20 (more specifically, control unit 21 of power storage device 20). The first sensor 31 can output a signal related to the detection result to the control unit 21 of the power storage device 20.

  The second sensor 32 is provided on the supply side of the commercial power supply 50 (distribution line that supplies power from the commercial power supply 50 to the house). The second sensor 32 can detect power to the commercial power source 50 (power that flows backward to the commercial power source 50). The second sensor 32 is electrically connected to the power storage device 20 (more specifically, the control unit 21 of the power storage device 20). The second sensor 32 can output a signal related to the detection result to the control unit 21 of the power storage device 20.

  The second sensor 32 has a function as a reverse current relay. More specifically, when the second sensor 32 detects that the electric power is equal to or lower than a predetermined electric energy (30 W in the present embodiment), the control unit 21 supplies electric power to the commercial power supply 50 based on a signal related to the detection result. Is generated (electric power flowing in the reverse direction is generated), and discharging of the power storage device 20 is stopped. The measurement accuracy of 30 W as the predetermined electric energy is plus or minus 10 W. And once the 2nd sensor 32 fulfill | performs the function as a reverse current relay (when the electric energy below the said predetermined electric energy is detected and discharge of the electrical storage apparatus 20 is stopped once), the electrical storage apparatus 20 will carry out predetermined time ( In the present embodiment, charging and discharging are not possible for 60 seconds). For example, the predetermined amount of power used as the determination criterion by the second sensor 32 is set to the minimum amount of power supplied from the commercial power supply 50. In this way, when the amount of power supplied from the commercial power supply 50 is equal to or less than the minimum amount, it can be determined that the reverse power is generated.

  The third sensor 33 is provided on a distribution line between the solar power generation unit 10 and the commercial power supply 50, the power storage device 20, and the home load 40. The third sensor 33 can detect the power flowing through the location. Third sensor 33 is electrically connected to power storage device 20 (more specifically, control unit 21 of power storage device 20). The third sensor 33 can output a signal related to the detection result to the control unit 21 of the power storage device 20.

  With such a configuration of the sensor unit 30, the control unit 21 of the power storage device 20 uses the power output from the solar power generation unit 10 (more specifically, the solar power generation unit 10 in response to a signal output from the first sensor 31. Information on the amount of generated power) can be acquired.

  In addition, the control unit 21 of the power storage device 20 can acquire information regarding whether or not power is flowing backward to the commercial power supply 50 based on a signal output from the second sensor 32.

  In addition, the control unit 21 of the power storage device 20 uses the signal output from the third sensor 33 and information acquired by the control unit 21 itself (more specifically, information related to the power charged / discharged in the power storage device 20). Based on this, the power supplied from the commercial power source 50 / solar power generation unit 10 side to the home load 40 / power storage device 20 side, that is, the power supplied to the distribution board (hereinafter referred to as “input power”). ) Can be obtained.

  Below, the electric power supply aspect in the electric power supply system 1 comprised as mentioned above is demonstrated easily.

  In the following description, the change in the direction of power distribution is controlled by a control unit such as a home server (not shown), or is controlled by a control unit included in a switch unit or a power conditioner (not shown). The present invention is not limited to this.

  The electric power generated by the solar power generation unit 10 is supplied to the household load 40. In addition, power from the commercial power supply 50 is also supplied to the household load 40. Thus, the resident of the house can turn on the lighting or use the cooking utensil or the air conditioner with the electric power from the solar power generation unit 10 and the commercial power source 50.

  In this case, when the electric power consumed by the household load 40 can be sufficiently supplied only by the electric power from the solar power generation unit 10, it is possible not to use the electric power from the commercial power supply 50. As a result, it is possible to save power charges.

  Moreover, the electric power from the solar power generation unit 10 and the commercial power supply 50 is charged in the power storage device 20 in an appropriate time zone. The charging time period can be arbitrarily set by the resident.

  For example, if it is set to charge at midnight, midnight power with a low charge can be charged to the power storage device 20. Moreover, if it sets so that the electric power from the solar power generation part 10 may be charged in the time zone when sunlight of daytime is fully irradiated, the solar power generation part 10 will generate electric power using natural energy (sunlight). The stored power can be charged in the power storage device 20.

  On the other hand, the electric power charged in the power storage device 20 can be supplied to the domestic load 40. That is, the power storage device 20 can be discharged and the discharged power can be supplied to the domestic load 40. The time zone during which power is supplied from the power storage device 20 to the household load 40 can be set arbitrarily by the resident. For example, by supplying the electric power charged in the power storage device 20 at midnight to the home load 40 during other (other than midnight) time periods, the power (purchasing power) supplied from the commercial power supply 50 during the time period can be reduced. This can save electricity costs.

  In addition, when the power consumed by the household load 40 can be adequately provided mainly by the power from the power storage device 20, it is possible not to use the power from the solar power generation unit 10 and the commercial power source 50. .

  For example, at midnight, solar power is charged from the commercial power source 50 to the power storage device 20 at a low price, and in the daytime when there is no resident in the house and the household load 40 does not consume much power. The power from the power generation unit 10 is charged in the power storage device 20. The electric power charged in the power storage device 20 is supplied to the home load 40 during a time period when a large amount of power is consumed by the home load 40 from when the resident returns home to sleep. As a result, it is possible to save power charges.

  Next, a power supply mode (mode) related to charging / discharging of the power storage device 20 in the power supply system 1 configured as described above will be described.

  In the power supply system 1, modes (power supply modes) relating to charging / discharging of the power storage device 20 are set in advance. Information regarding the mode is stored in the storage device of the control unit 21 of the power storage device 20. In the present embodiment, the power supply system 1 has two modes (hereinafter referred to as “first mode” and “second mode”, respectively) as the modes. The first mode and the second mode can be arbitrarily selected by a resident of a house, for example.

  Hereinafter, the second mode will be described in detail.

  The second mode relates to charging / discharging of the power storage device 20 for the purpose of selling the power generated by the solar power generation unit 10 (reversing power to the commercial power supply 50) (to obtain financial profit). In this mode, the power supply mode is set.

  More specifically, as shown in FIG. 2, when the second mode is selected, the solar power generation unit 10 generates power, and the power generated by the solar power generation unit 10 flows backward to the commercial power source 50. Then, the power storage device 20 is not discharged and power is not supplied from the power storage device 20 to the home load 40 (that is, power supply from the power storage device 20 to the home load 40 is impossible). .

  Below, the supply aspect of the electric power regarding charging / discharging of the electrical storage apparatus 20 when the 2nd mode is selected is demonstrated using the flowchart of FIG.

In step S101, the control unit 21 determines whether or not the current time is a preset charging time. The determination is performed using a timer (not shown) included in the control unit 21. Note that the preset charging time is assumed to be a midnight time zone in which the power supplied from the commercial power supply 50 is midnight power at a relatively low charge.
When the control unit 21 determines that the current time is a preset charging time, the control unit 21 proceeds to step S108.
When the control unit 21 determines that the current time is not the preset charging time, the control unit 21 proceeds to step S102.

In step S <b> 102, the control unit 21 determines whether power (capacity) remains in the power storage device 20.
When the control unit 21 determines that power remains in the power storage device 20, the control unit 21 proceeds to step S103.
When the control unit 21 determines that no power remains in the power storage device 20, the control unit 21 proceeds to step S106.

In step S <b> 103, the control unit 21 issues a discharge instruction regarding charging / discharging of the power storage device 20.
After performing the process of step S103, the control unit 21 proceeds to step S104.

In step S <b> 104, the control unit 21 determines whether the photovoltaic power generation unit 10 is generating power based on the detection result of the first sensor 31, or the detection result of the first sensor 31, the charge / discharge power amount of the power storage device 20, and the third. Based on the detection result of the sensor 33, it is determined whether or not the amount of power consumed by the household load 40 is equal to or less than a certain amount.
When the control unit 21 determines that the photovoltaic power generation unit 10 is generating power or the amount of power consumed by the household load 40 is equal to or less than a certain amount, the control unit 21 proceeds to step S105.
When the control unit 21 determines that the solar power generation unit 10 is not generating power or the amount of power consumed by the household load 40 is not equal to or less than a predetermined amount, the control unit 21 proceeds to step S107. . As described above, it is possible to control the operation of the power storage device 20 at the time of power sale by determining whether the solar power generation unit 10 is generating power. Further, by determining whether or not the amount of power consumed by the household load 40 is equal to or less than a certain amount, the amount of power charged in the power storage device 20 can be used efficiently. This is because the conversion efficiency at the time of conversion from DC power to AC power by an inverter or the like mounted on the power storage device 20 becomes worse when the amount of discharged power is small. This is because power can be efficiently used by receiving power supply from the commercial power supply 50 when the amount of power to be discharged is small. The constant amount in step S104 is set in accordance with the amount of electric power that provides a discharge amount that allows DC / AC conversion at an arbitrarily determined conversion efficiency or higher.

In step S <b> 105, the control unit 21 waits without discharging the power charged in the power storage device 20.
After performing the process of step S105, the control unit 21 proceeds to step S101 again.

In step S <b> 107, the control unit 21 discharges the electric power charged in the power storage device 20. The electric power discharged from the power storage device 20 is supplied to the household load 40.
After performing the process of step S107, the control unit 21 proceeds to step S101 again.

In step S <b> 106 transferred from step S <b> 102, the control unit 21 issues a standby instruction regarding charge / discharge of the power storage device 20.
After performing the process of step S106, the control unit 21 proceeds to step S101 again.

In step S <b> 108 transferred from step S <b> 101, the control unit 21 issues a charge instruction regarding charge / discharge of the power storage device 20.
After performing the process of step S108, the control unit 21 proceeds to step S101 again.

  With such a configuration, for example, “when power is supplied from the power storage device 20 to the household load 40 during power generation by the solar power generation unit 10, the selling price of power from the solar power generation unit 10 is reduced”. If there is a rule, it is possible to prevent the selling price of power from the photovoltaic power generation unit 10 from being reduced by making it impossible to supply power from the power storage device 20 to the household load 40. it can. As described above, in the power supply system 1, when the second mode is selected, it is possible to give a resident a monetary profit.

  Hereinafter, the first mode will be described in detail.

  In the first mode, the power generated by the solar power generation unit 10 is charged in the power storage device 20, and the charged power is consumed in the house as necessary (to obtain an energy saving effect). In this mode, the power supply mode related to charging / discharging of the power storage device 20 is set.

More specifically, as shown in FIG. 4 (a), when the first mode is selected, the photovoltaic power generation unit 10 generates power, and the solar power generation unit 10 generates power and the household load. When surplus power is generated in the power supplied to 40, the power storage device 20 is charged without the surplus power flowing backward to the commercial power source 50.
In addition, as shown in FIG. 4B, when the first mode is selected and the solar power generation unit 10 is not generating power, the power storage device 20 is discharged from the power storage device 20. Electric power is supplied to the household load 40.

Hereinafter, a power supply mode related to charging / discharging of the power storage device 20 when the first mode is selected will be described with reference to the flowchart of FIG. 5 and FIGS. 6 to 8.
In addition, the arrow in the following drawings has shown the distribution direction of electric power. Moreover, the numerical value attached | subjected to the said arrow has shown the electric energy of the electric power in the said arrow.

In step S201, the control unit 21 determines that the amount of power (power generation amount) generated by the solar power generation unit 10 is equal to or greater than a certain amount (for example, 600 W in the present embodiment), and the power storage device 20 Determine whether the battery is not fully charged.
When the control unit 21 determines that the amount of power (power generation amount) generated by the solar power generation unit 10 is equal to or greater than a predetermined amount and the power storage device 20 is not fully charged, the control unit 21 proceeds to step S202.
When the control unit 21 determines that the amount of power (power generation amount) generated by the solar power generation unit 10 is equal to or greater than a predetermined amount and the power storage device 20 is not fully charged, the control unit 21 proceeds to step S210.

Here, the power supply mode shown in FIG. 6A will be described.
The amount of electric power (power generation amount) generated by the solar power generation unit 10 is 2000 W. The amount of power consumed by the household load 40 is 1000W. The power consumption of the household load 40 is covered by the power from the solar power generation unit 10. Further, surplus power (1000 W power amount) supplied from the solar power generation unit 10 to the household load 40 is sold (reverse power flow to the commercial power supply 50).

  In such a case, if the power storage device 20 is not fully charged, the amount of electric power (power generation amount) generated by the solar power generation unit 10 is 2000 W and 600 W or more, so the process proceeds to step S202. become.

In step S <b> 202, the control unit 21 issues a charging instruction regarding charging / discharging of the power storage device 20.
After performing the process of step S202, the control unit 21 proceeds to step S203.

In step S203, the control unit 21 stores the power storage device 20 so that the amount of power purchased from the commercial power supply 50 becomes a preset amount of power (hereinafter referred to as “first power amount W10”). Start charging. In the present embodiment, it is assumed that the first power amount W10 is 100W. Moreover, 1st electric energy W10 is one Embodiment of the 1st electric energy which concerns on this invention, and does not limit electric energy to 100W.
After performing the process of step S203, the control unit 21 proceeds to step S204.

  In step S203, the amount of power purchased from the commercial power source 50 is set to the first power amount W10 (100 W), so that power is supplied from the commercial power source 50 while suppressing the amount of purchased power ( It is possible to prevent the power from being reversely flowed (power sold) to the commercial power supply 50 only by slightly increasing the amount of power generated by the photovoltaic power generation unit 10 while securing the power purchase state). . That is, the amount of power generated by the photovoltaic power generation unit 10 is easily affected by the weather (such as cloudiness or rain) and is in a relatively unstable state. Can do. In addition, this makes it difficult for the second sensor 32 to detect a power amount equal to or lower than a predetermined power amount (30 W in the present embodiment), and the power storage device 20 is in a state where it cannot be charged or discharged for a predetermined time. This can be avoided, and as a result, the power storage device 20 can be continuously operated.

Here, the power supply mode shown in FIG. 6B will be described.
FIG. 6B illustrates a power supply mode in a state where the control unit 21 performs the process of step 203 from the power supply mode illustrated in FIG.
That is, the control unit 21 starts charging the power storage device 20 so that the amount of power purchased from the commercial power supply 50 becomes the first power amount W10 (100 W). Specifically, the power storage device 20 is charged with 1100 W of power. As a result, the total amount of power supplied to the household load 40 and the power storage device 20 is 2100 W.

In step S204 transferred from step S203, the control unit 21 determines whether the amount of power purchased from the commercial power supply 50 is less than the first power amount W10 (100 W).
If the control unit 21 determines that the amount of power purchased from the commercial power supply 50 is less than the first power amount W10 (100 W), the control unit 21 proceeds to step S205.
If the control unit 21 determines that the amount of power purchased from the commercial power supply 50 is not less than the first power amount W10 (100 W), the control unit 21 proceeds to step S206.

In step S <b> 205, the control unit 21 increases the amount of power that is charged in the power storage device 20.
After performing the process of step S205, the control unit 21 proceeds to step S208.

Here, the power supply mode shown in FIG. 7A will be described.
FIG. 7A shows a power supply mode when the amount of power generated by the solar power generation unit 10 suddenly increases from the power supply mode shown in FIG. 6B.
That is, the electric power generated by the solar power generation unit 10 has increased from 2000 W to 3000 W, and the electric power (2100 W of power supplied to the home load 40 and the power storage device 20 from the solar power generation unit 10 (3000 W electric energy)). The surplus power (the amount of power of 900 W) is sold (reverse power flow to the commercial power source 50).

  In such a case, the amount of power purchased from the commercial power supply 50 (−900 W) is smaller than the first amount of power W10 (100 W), and thus the process proceeds to step S205.

Next, the power supply mode shown in FIG. 7B will be described.
FIG. 7B illustrates a power supply mode in a state where the control unit 21 performs the process of step 205 from the power supply mode illustrated in FIG.
That is, the control unit 21 increases the amount of power to be charged in the power storage device 20 so that the amount of power purchased from the commercial power supply 50 becomes the first power amount W10 (100 W). Specifically, the amount of power charged in power storage device 20 is increased from 1100 W to 2100 W. As a result, the total amount of power supplied to the household load 40 and the power storage device 20 is 2100 W.

In step S206 transferred from step S204, the control unit 21 uses the amount of power purchased from the commercial power source 50 as an upper limit of the amount of power purchased from the commercial power source 50 so that the amount of purchased power does not increase in the first mode. Is greater than or equal to a predetermined power amount (hereinafter referred to as “second power amount W20”). In the present embodiment, it is assumed that the second power amount W20 is 2000W. Thus, the second power amount W20 is set to be a relatively larger amount of power than the first power amount W10 (100 W). The second power amount W20 is an embodiment of the second power amount according to the present invention, and the power amount is not limited to 2000W.
If the control unit 21 determines that the amount of power purchased from the commercial power supply 50 is equal to or greater than the second power amount W20 (2000 W), the control unit 21 proceeds to step S210.
If the control unit 21 determines that the amount of power purchased from the commercial power supply 50 is not equal to or greater than the second power amount W20 (2000 W), the control unit 21 proceeds to step S207.

In step S <b> 207, the control unit 21 decreases the amount of power that is charged in the power storage device 20.
After performing the process of step S207, the control unit 21 proceeds to step S208.

Here, the power supply mode shown in FIG. 8A will be described.
FIG. 8A shows a power supply mode when the amount of power consumed by the household load 40 suddenly increases from the power supply mode shown in FIG. 7B.
That is, the power consumption of the household load 40 has increased from 1000 W to 4000 W, and the amount of power (3100 W) that is insufficient with only 3000 W of power from the solar power generation unit 10 is purchased from the commercial power supply 50.

  In such a case, the amount of power purchased from the commercial power source 50 (3100 W) is not less than the first power amount W10 (100 W) (step S204), and the amount of power purchased from the commercial power source 50 is the first amount. Since it is more than two electric energy W20 (2000W) (Step S206), it will transfer to Step S211 via Step S210.

In step S <b> 208, the control unit 21 determines whether the power storage device 20 is fully charged or whether the amount of power (charge current) stored in the power storage device 20 is “0” (zero).
When the control unit 21 determines that the power storage device 20 is fully charged or the amount of power (charge current) stored in the power storage device 20 is “0” (zero), the control unit 21 proceeds to step S209. .
When the control unit 21 determines that the power storage device 20 is not fully charged and the amount of power stored in the power storage device 20 (charging current) is not “0” (zero), the control unit 21 proceeds to step S201 again. .

In step S <b> 209, the control unit 21 issues a standby instruction regarding charging / discharging of the power storage device 20.
After performing the process of step S209, the control unit 21 proceeds to step S201 again.

In step S210 transferred from step S201 and step S206, the control unit 21 determines whether or not the amount of power (capacity) stored in the power storage device 20 is equal to or less than a specified value. This specified value is set as a threshold for the amount of power that can be discharged by power storage device 20 (hereinafter also referred to as a dischargeable threshold).
If the control unit 21 determines that the amount of power (capacity) stored in the power storage device 20 is equal to or less than the specified value, the control unit 21 proceeds to step S209.
When the control unit 21 determines that the amount of power (capacity) stored in the power storage device 20 is not less than or equal to the specified value, the control unit 21 proceeds to step S211.

In step S <b> 211, the control unit 21 issues a discharge instruction regarding charge / discharge of the power storage device 20.
More specifically, control unit 21 discharges a predetermined amount of power from power storage device 20 such that the amount of power purchased from commercial power supply 50 is 100 W or less.
After performing the process of step S211, the control unit 21 proceeds to step S201 again.

  The discharge instruction for charging / discharging the power storage device 20 in step S211 is performed when the amount of power purchased from the commercial power supply 50 is equal to or greater than the second power amount W20 (2000 W) in step S206. Here, 2000 W as the second electric energy W20 is set as an electric energy larger than the dischargeable threshold based on the dischargeable threshold of the power storage device 20 (500 W in the present embodiment). Thus, the power storage device 20 cannot be discharged without purchasing a certain amount of power, and the discharge of the power storage device 20 and the stop of the discharge can be prevented from being repeated.

Here, the power supply mode shown in FIG. 8B will be described.
FIG. 8B illustrates a power supply mode in a state where the control unit 21 performs the process of step S211 from the power supply mode illustrated in FIG.
That is, the control unit 21 discharges the power storage device 20 so that the amount of power purchased from the commercial power supply 50 is 100 W or less. Specifically, the power storage device 20 discharges 900 W of power and supplies it to the household load 40. As a result, out of the power consumption of the household load 40 (4000 W power amount), the total power amount of the solar power generation unit 10 (3000 W power amount) and the power storage device 20 (900 W power amount) is 3900 W, The insufficient power amount (100 W) is set as a predetermined power amount to be purchased from the commercial power source 50.

  With such a configuration, when the first mode is selected, the power generated by the photovoltaic power generation unit 10 is charged into the power storage device 20 without causing the commercial power source 50 to reversely flow, and if necessary (commercial The charged power (instead of the power from the power supply 50) can be consumed in the house. Thus, in the power supply system 1, when the first mode is selected, an energy saving effect can be obtained.

As above
A power supply system 1 according to an embodiment of the present invention includes:
A solar power generation unit 10 capable of generating power by receiving sunlight;
A power storage device 20 capable of charging and discharging electric power from a commercial power source 50 and the solar power generation unit 10, and
A power supply system that supplies power from the solar power generation unit 10, the commercial power source 50, and the power storage device 20 to a load (in-home load 40),
It has a first mode as a power supply mode related to charging / discharging of the power storage device 20,
In the first mode,
When the solar power generation unit 10 is not generating power,
Discharging the power storage device 20 to supply power to the load;
When the solar power generation unit 10 generates power and surplus occurs in the power supplied from the solar power generation unit 10 to the load,
In order to set the power amount of power supplied from the commercial power supply 50 to a preset first power amount (first power amount W10),
By charging the power storage device 20 with a predetermined amount of power, the total power amount of the power amount charged in the power storage device 20 and the power amount consumed by the load is the solar power generation unit. The first power amount (first power amount W10) is made larger than the power amount of power from 10.

  With such a configuration, the power supply system 1 can efficiently supply power from a plurality of devices or the like (solar power generation unit 10, commercial power supply 50, power storage device 20) to the household load 40.

  More specifically, by purchasing the minimum amount of power from the commercial power source 50, the power from the power storage device 20 flows backward to the commercial power source 50 while preventing unnecessary power from being purchased unnecessarily. This can be prevented.

In the power supply system 1,
When the amount of power supplied from the commercial power supply 50 is less than the first power amount (first power amount W10),
By increasing the amount of power charged in the power storage device 20, the amount of power supplied from the commercial power supply 50 is set to the first power amount (first power amount W10).

  With such a configuration, for example, even when the amount of power generated by the solar power generation unit 10 suddenly increases, the power from the solar power generation unit 10 can be efficiently supplied to the household load 40.

In the power supply system 1,
When the amount of electric power supplied from the commercial power supply 50 is equal to or higher than the second electric energy (second electric energy W20) set as the electric energy larger than the first electric energy (first electric energy W10). Is
By discharging the power storage device 20 and supplying a predetermined amount of power to the load, the amount of power supplied from the commercial power supply 50 is close to the first power amount (first power amount W10). It is.

  With such a configuration, for example, even when the power consumption of the home load 40 suddenly increases, the power from the commercial power supply 50, the solar power generation unit 10, and the power storage device 20 is supplied to the home load 40. It can be supplied efficiently.

In the power supply system 1,
Having a second mode as a power supply mode related to charging and discharging of the power storage device 20,
In the second mode,
When the solar power generation unit 10 generates power and the power from the solar power generation unit 10 is flowing backward to the commercial power supply 50,
It is impossible to discharge power from the power storage device 20 to the load.

  With such a configuration, the power from the power storage device 20 can flow backward to the commercial power supply 50 to obtain a financial profit.

DESCRIPTION OF SYMBOLS 1 Electric power supply system 10 Solar power generation part 20 Power storage device 30 Sensor part 40 Domestic load 50 Commercial power supply

Claims (5)

A solar power generation unit capable of generating power by receiving sunlight,
Connected to the commercial power source and connected to the commercial power source in order from the commercial power source side, the solar power generation unit and the load are connected, and the electric power from the commercial power source and the solar power generation unit can be charged / discharged Power storage device,
A sensor unit for detecting power information at a predetermined position;
Comprising
A power supply system that supplies power from the solar power generation unit, the commercial power source, and the power storage device to the load,
The sensor unit is
A first sensor for detecting electric power supplied from the solar power generation unit;
In a distribution line connecting the commercial power source and the power storage device, a second sensor provided between the commercial power source and a connection portion with the solar power generation unit,
Comprising
As a supply mode of power related to charging and discharging of the power storage device, it has a first mode and a second mode that can be arbitrarily selected,
In the first mode,
When it is determined that the photovoltaic power generation unit is generating power based on the detection result of the first sensor, the power of the first power set in advance is supplied from the commercial power source. Charging the power storage device based on the detection result of the second sensor, charging a predetermined amount of power,
In the second mode,
When it is determined that the photovoltaic power generation unit is generating power based on the detection result of the first sensor, the power storage device is set in a standby state in which it is not discharged regardless of the detection result of the second sensor. , Making it impossible to discharge the power storage device,
A power supply system characterized by that. In the first mode,
When it is determined that the photovoltaic power generation unit is generating power based on the detection result of the first sensor, and when surplus occurs in the power supplied from the solar power generation unit to the load. Charging the power storage device;
The power supply system according to claim 1. The sensor unit is
In the distribution line, comprising a third sensor provided between the connection with the photovoltaic power generation unit and the connection with the load,
In the first mode and the second mode,
When it is determined that the photovoltaic power generation unit is not generating power based on the detection result of the first sensor, the power storage device uses the power to be consumed by the load based on the detection result of the third sensor. Discharge from the
The power supply system according to claim 1, wherein the power supply system is a power supply system. In the first mode,
When the amount of power supplied from the commercial power source is less than the first power amount,
By controlling the amount of electric power supplied from the commercial power supply to be the first electric energy by increasing the amount of electric power charged in the power storage device,
The power supply system according to any one of claims 1 to 3, wherein In the first mode,
When the amount of electric power supplied from the commercial power source is equal to or higher than the second electric energy set as the electric energy larger than the first electric energy,
Controlling the power amount of power supplied from the commercial power source to be the first power amount by discharging the power storage device and supplying a predetermined amount of power to the load;
The power supply system according to any one of claims 1 to 4, characterized in that:

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