JP2018046738A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system that makes it possible to automatically perform charge/discharge of a mobile storage battery and fixed storage battery in predetermined preferential order, and perform it with a simple configuration.SOLUTION: A power supply system comprises: a charge/discharge unit 10 including a charge/discharge converter 12 and a controller 13; a mobile storage battery charge/discharge device 20 including a charge/discharge converter 22 and a controller 23; and a natural energy power generation system 30. The power supply system includes power detectors 5, 6 for detecting power from a system power supply E. The controllers 13, 23, on the basis of detection power detected by the power detectors 5, 6, change over the charge/discharge converter 12 and charge/discharge converter 22 to charge control or discharge control to control the respective converters so that the detection power is constant, where a first threshold for performing control using the controller 13 differs from a second threshold for performing control using the controller 23, making charge/discharge of a fixed storage battery 14 and mobile storage battery 21 be performed in predetermined preferential order.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply system that charges and discharges a fixed storage battery and a mobile storage battery.

  2. Description of the Related Art Conventionally, a power supply system that charges and discharges a fixed storage battery installed in a house and a mobile storage battery mounted on an electric vehicle or the like is known (see Patent Document 1).

  Such a power supply system includes an operation unit provided in a building, a power storage unit provided outside the building, and a charging stand that charges and discharges a mobile storage battery of an electric vehicle. The power storage unit has a storage battery and a bidirectional power conditioner, etc., charging AC power from the AC power line to the storage battery via the bidirectional power conditioner, and charging the DC power via the bidirectional power conditioner. Or discharge to an AC power line.

  In this power supply system, whether or not the mobile storage battery has an excess storage amount exceeding the storage amount necessary for the next vehicle travel is displayed on the display unit of the operation unit, and the operation is performed when the excess power is stored. By operating the operation switch of the unit, a command signal for starting discharge is output from the operation unit to the on-vehicle charger / discharger, and the on-vehicle charger / discharger receives the command signal to discharge the mobile storage battery and is discharged from the fixed storage battery. It is designed to cover the shortage of electricity.

Japanese Patent No. 5327248 JP 2012-191698 A

  However, in such a power supply system, when the operation switch of the operation unit is operated, discharging starts from the mobile storage battery, and the mobile storage battery is not automatically discharged. In particular, if it is possible to automatically charge and discharge the storage battery and the mobile storage battery in a predetermined priority order, for example, it is necessary to provide a central control unit that monitors the power storage unit and the charging stand, and the configuration becomes considerably complicated. End up.

  In addition, a power supply system (see Patent Document 2) has been proposed in which the charge amounts of the fixed storage battery and the mobile storage battery can be accommodated and the charge amount can be automatically optimized. Since the discharge circuit is used, the configuration of the power supply system is considerably complicated.

  An object of the present invention is to provide a power supply system that can automatically charge and discharge a mobile storage battery and a fixed storage battery in a predetermined priority order and that can be configured with a simple configuration.

The present invention relates to a charge / discharge converter for a fixed storage battery that performs charge / discharge of a fixed storage battery installed at a predetermined position, and a first control device that controls the charge / discharge of the charge / discharge converter for the fixed storage battery. Equipment,
A mobile storage battery charge / discharge device having a mobile storage battery charge / discharge converter for charging / discharging a mobile storage battery mounted on a mobile body, and a second control device for controlling charge / discharge of the mobile storage battery charge / discharge converter;
With a natural energy power generation system,
The fixed storage battery and the mobile storage battery can be charged with the system power of the system power supply or the generated power of the natural energy power generation system by the control of the first control device and the second control device. An electric power supply system capable of supplying electric power charged to the home load,
A power detector is provided for detecting the supply power supplied from the system power supply to a branch point divided from the power supply line of the system power supply to the charging / discharging device for the fixed storage battery and the charge / discharge device for the mobile storage battery,
The first control device and the second control device perform charge control or discharge control of the fixed storage battery and the mobile storage battery based on detected power detected by the power detector,
A first threshold for preventing charge control or discharge control by the first control device and power reverse flow to the system power supply, charge control or discharge control by the second control device, and power reverse flow to the system power supply The fixed storage battery and the mobile storage battery are automatically charged and discharged in a predetermined priority order according to the detected power detected by the power detector. To do.

  According to the present invention, charging and discharging of the mobile storage battery and the fixed storage battery can be performed automatically in a predetermined priority order with a simple configuration.

It is explanatory drawing which showed schematically the structure of the electric power supply system which concerns on the Example of this invention. It is explanatory drawing which shows the basic operation | movement of the electric power supply system when economic mode is set. It is a table | surface which shows the state of charging / discharging of a fixed storage battery and a mobile storage battery with respect to the magnitude | size of the electric power purchase (threshold value) in the case of economic mode and green mode. It is explanatory drawing which shows the basic operation | movement of the electric power supply system when a green mode is set. It is a time chart which shows the specific operation | movement of the electric power supply system when economic mode is set. It is a time chart which shows the specific operation | movement of the electric power supply system when green mode is set. It is explanatory drawing which showed the relationship between the charge / discharge control of a mobile storage battery and a fixed storage battery, and the detected value of an electric power detector.

  Hereinafter, an embodiment which is an embodiment of a power supply system according to the present invention will be described with reference to the drawings.

  The power supply system S shown in FIG. 1 includes a charge / discharge unit 10, a charge / discharge device 20 for a mobile storage battery, and a solar power generation system 30 that is a natural energy system. In this embodiment, the solar power generation system 30 is used. However, the present invention is not limited to this. For example, a wind power generation system may be used.

  The charging / discharging unit 10 and the mobile storage battery charging / discharging device 20 are installed outside the building H. In the building H, an information distribution board 40, a self-supporting distribution board 50, and the like are provided.

  The charge / discharge unit 10 is connected to the system power supply line (power supply line) 2 of the system power supply E by the power supply connection line 1, and the mobile storage battery charging / discharging device 20 is connected to the system power supply line 2 by the power supply connection line 3. Has been. Then, AC power is supplied from the system power supply E to the connection point (branch point) 4 between the power supply connection line 1 and the power supply connection line 3, and the system power supply line 2 is connected to the system power supply E. Are provided with power detectors 5 and 6 for detecting power supplied to the connection point 4. The power supply connection line 1 is provided with a power detector 7 that detects power supplied from the system power supply E to the charge / discharge unit 10 or power discharged from the charge / discharge unit 10 to the connection point 4.

  The charge / discharge unit 10 includes a photovoltaic power conditioner 11, a charge / discharge converter (fixed battery charge / discharge converter) 12, and a control device (first control device) 13. The power conditioner 11 for photovoltaic power generation and the charge / discharge converter 12 are an integrated power conditioner.

  The photovoltaic power conditioner 11 converts the DC power generated by the photovoltaic panel PV <b> 1 into AC power and outputs the AC power to the power supply connection line 1. And the photovoltaic power generation panel (natural energy system) is comprised with the photovoltaic power generation panel PV1 and the power conditioner 11 for photovoltaic power generation. Further, the charge / discharge converter 12 and the control device 13 constitute a charge / discharge device for a fixed storage battery.

  The charge / discharge converter 12 receives AC power output from the photovoltaic power conditioner 11, AC power output from the photovoltaic power conditioner 31 described later, and AC power supplied from the system power supply E. It converts into direct-current power, charges the fixed storage battery 14, or converts the direct-current power charged into the fixed storage battery 14 into alternating current power, and supplies (discharges) it to the power supply connection line 1. The fixed storage battery 14 is installed at a predetermined position.

  Based on the detected power detected by the power detector 6, the control device 13 switches the operation of the charge / discharge converter 12 to charge control or discharge control, and controls the charge / discharge converter 12 so that the detected power is constant. Thus, charging / discharging of the fixed storage battery 14 is performed. Here, when the power detector 6 detects power purchase of A (W) that is the first threshold, the control device 13 discharges the fixed storage battery 14 so as to maintain A (W) of power purchase.

  In addition, when the detected power of the power detector 6 is smaller than A (W), the control device 13 does not operate the charge / discharge converter 12 in the economic mode, so that the fixed storage battery 14 is not charged / discharged. That is, the fixed storage battery 14 is on standby. In the case of the green mode, the control device 13 controls the charge / discharge converter 12 to charge the fixed storage battery 14. That is, as shown in the table of FIG. 3, when the detected power of the power detector 6 is smaller than A (W), the control device 13 is a charge / discharge converter so that the detected power of the power detector 6 becomes A (W). 12 is charged to charge the fixed storage battery 14. This first threshold is a power sale state in which power is supplied (returned) from the power supply system S to the system power supply E by setting the power to be purchased, that is, AC power supplied from the system power supply E to A (W). That is, the reverse power flow is prevented.

  The economic mode and the green mode are set by operating a remote control device (hereinafter referred to as a remote controller) (not shown).

  Economic mode means storing cheap electricity at night from an electric power company, covering the electricity stored during the expensive daytime, and surplus electricity generated by daytime solar power generation system. It is a mode that gains economics by charging.

  Green mode refers to storing surplus power out of the power generated by the solar power generation system during the day, and using the stored power in the morning and evening to reduce the amount of power purchased from the power company and ensure that the power is self-sufficient. It is a mode aimed at.

  The photovoltaic power generation system 30 includes a photovoltaic power generation panel PV2 and a photovoltaic power generation power conditioner 31, and the photovoltaic power generation panel PV2 generates power to generate direct current power. Convert and output. 32 is an emergency outlet.

  The mobile storage battery charge / discharge device 20 controls a charge / discharge converter (charge / discharge converter for mobile storage battery) 22 that charges and discharges the mobile storage battery 21 mounted on the electric vehicle (mobile body) EV, and the charge / discharge converter 22. And a control device (second control device) 23 and the like. The charge / discharge converter 22 is connected to the above-described power supply connection line 3, and the power supply connection line 3 is connected to the power conditioner 31 for photovoltaic power generation via the power supply connection line 25. The power supply connection line 3 is connected to the information distribution board 40 via the power supply connection line 26.

  As a result, AC power output from the power conditioner 31 for photovoltaic power generation is supplied to the charge / discharge converter 22 via the power supply connection line 25 and the power supply connection line 3, and further provides power supply. It is supplied to the information distribution board 40 through the connection line 26.

  The power supply connection line 25 is provided with a power detector 28 that detects AC power output from the photovoltaic power conditioner 31.

  The control device 23 switches the operation of the charge / discharge converter 22 to charge control or discharge control based on the detected power detected by the power detector 5 and controls the charge / discharge converter 22 so that the detected power becomes constant. The mobile storage battery 21 is charged and discharged. Here, when the power detector 5 detects power purchase of B (W) (B (W)> A (W)), which is the second threshold, the control device 23 maintains B (W) of power purchase. Then, the mobile storage battery 21 is discharged.

  Further, when the detected power of the power detector 5 is smaller than B (W), the control device 23 does not operate the charge / discharge converter 22 in the economic mode, and thus the mobile storage battery 21 is on standby. In the case of the green mode, the charge / discharge converter 22 is controlled to charge the mobile storage battery 21. That is, as shown in the table of FIG. 3, when the detected power of the power detector 5 is smaller than B (W), the control device 23 is set so that the detected power (power purchase) of the power detector 5 becomes B (W). Controls the charge / discharge converter 22 to charge the mobile storage battery 21. Moreover, the control apparatus 23 will discharge the mobile storage battery 21 so that detection power may maintain B (W), if the detection power of the electric power detector 5 turns into B (W). The second threshold is set to a power sale state in which power flows from the power supply system S to the system power source E by setting the power to be purchased, that is, AC power supplied from the system power source E to B (W). That is, the reverse power flow is prevented.

  The maximum charge / discharge power of the mobile storage battery 21 is set larger than the maximum charge / discharge power of the fixed storage battery 14.

  A plurality of in-house loads Q1 to Qn are connected to the information distribution board 40. Here, outlets and the like are omitted for convenience of explanation, and a description will be given assuming that a household load is connected to each outlet.

  A plurality of in-house loads R <b> 1 to R <b> 3 are connected to the independent distribution board 50. Here, only three home loads R1 to R3 are shown. However, the present invention is not limited to this, and any number may be used as long as power is supplied to the minimum required home load at the time of a power failure.

  The self-supporting distribution board 50 is connected to the information distribution board 40 via the changeover switch S4, and a part of the electric power supplied to the information distribution board 40 via the changeover switch S4 is supplied to the self-supporting distribution board 50. It comes to be supplied.

  The changeover switch S4 is connected to the terminal S4a when the electric vehicle EV is connected to the mobile storage battery charging / discharging device 20 at the normal time and during a power failure, and the electric vehicle EV is connected to the mobile storage battery charging / discharging device 20. When there is no power outage, it is connected to the terminal S4b. The changeover switch S4 is switched by the information distribution board 40, and is switched by the user pressing a “self-sustaining operation button” on a remote controller (not shown).

[Operation]
Next, the operation of the power supply system S configured as described above will be described. First, the basic operation of the power supply system S will be described.

  When the economic mode is set, as shown in FIG. 2, when the power generated by the photovoltaic power generation (PV1 + PV2 generated power) is F1 (W), the power consumption of the home loads Q and R is zero from the time T0. When the power consumption increases to F1 (W) at the time T1, the power generation by solar power generation is larger than the power consumption during the period from the time T0 to the time T1, and the power is sold. For this reason, the detected power detected by the power detector 6 detects power equal to or less than A (W) of power purchase. For this reason, as shown in the table of FIG. 3, the fixed storage battery 14 is in a standby state, that is, charging / discharging of the fixed storage battery 14 is not performed. At this time, since the detected power detected by the power detector 5 is B (W) or less, the mobile storage battery 21 is not discharged and is on standby.

  After the time point T1, the power consumption of the home loads Q and R becomes larger than the generated power F1 of the photovoltaic power generation, and the power purchase state is entered. When the detected power detected by the power detector 6 is greater than or equal to A (W) due to the increase in power consumption, the control device 13 of the charge / discharge unit 10 causes the detected power detected by the power detector 6 to be constant. That is, the fixed storage battery 14 is discharged by controlling the charge / discharge converter 12 so that the detected power is maintained at A (W). The amount of discharge increases as the power consumption increases. Also at this time, the mobile storage battery 21 is on standby. That is, the fixed storage battery 14 is preferentially discharged.

  When the discharge amount of the fixed storage battery 14 reaches the maximum discharge amount and the power consumption further increases, the power supplied (purchased) from the system power source E further increases, and the power purchase amount is When it becomes B (W) or more (time T2), that is, when the detected power detected by the power detector 5 becomes B (W) or more, the control device 23 of the mobile storage battery charge / discharge device 20 controls the charge / discharge converter 22. Then, the mobile storage battery 21 of the electric vehicle EV is discharged. At this time, the control device 23 controls the charge / discharge converter 22 so that the detected power detected by the power detector 5 is maintained at B (W). At this time, the fixed storage battery 14 is discharged with the maximum discharge amount.

  Furthermore, when the power consumption increases and the discharge amount of the mobile storage battery 21 reaches the maximum discharge amount (time point T3), the discharge amount of the fixed storage battery 14 and the mobile storage battery 21 can cover the further increase in power consumption. Since this is not possible, power will be purchased from the system power supply E.

  As described above, the discharge of the fixed storage battery 14 is preferentially performed, and the switching from the standby of the fixed storage battery 14 and the mobile storage battery 21 to the discharge operation is based on the detected power detected by the power detectors 5 and 6. It is automatically performed in a predetermined order. That is, since the first threshold value A (W) used by the control device 13 and the second threshold value B (W) used by the control device 23 are different from each other, the charge / discharge operation of the fixed storage battery 14 and the mobile storage battery 21 is started. Different charging / discharging can be performed in a predetermined priority order. For this reason, there is no need to provide a central control unit for monitoring the charging / discharging unit (electric storage unit) 10 or the charging / discharging device (charging stand) 20 for mobile storage batteries, and therefore the configuration of the power supply system S is simplified. Can do.

  Next, a case where the green mode is set as shown in FIG. 4 will be described.

  In FIG. 4, at time T0, the power generated by solar power generation is F2, and the maximum charging power of the mobile storage battery 21 is F3 (<F2).

  At time T0 to T1a, the control device 13 of the charge / discharge unit 10 is in a power sale state because the power generated by solar power generation is larger than the power consumption. For this reason, the detected power detected by the power detector 6 detects power equal to or less than A (W) of power purchase. For this reason, as shown in the table of FIG. 3, the fixed storage battery 14 is charged. Moreover, since the detection electric power which the electric power detector 5 detects also detects the electric power below A (W) of electric power purchase, the mobile storage battery 21 is also charged.

In this case, the mobile storage battery 21 is charged first, and the fixed storage battery 14 is charged by the difference between the surplus power of solar power generation and the charge amount of the mobile storage battery 21. This is because when the power generated by solar power generation is larger than the amount of power consumed, the power is temporarily sold. In this power selling state, the power in the direction in which the power detectors 5 and 6 sell power to the system power source E Although detected, as shown in FIG. 7, the detection threshold (B (W)) is smaller than the detection threshold (A (W)) with respect to the direction of selling power to the system (negative direction). Priority is given to charging.
That is, the difference between the detection threshold (B (W)) and the power detected by the power detector 5 (power selling power) is the difference between the detection threshold (A (W)) and the power detected by the power detector 6 (power selling power). ), The charging current of the mobile storage battery 21 is considerably larger than the charging current of the fixed storage battery 14, and as a result, the mobile storage battery 21 is prioritized and only the mobile storage battery 21 is actually charged. It will be.
When there is surplus power exceeding the maximum charging power of the mobile storage battery 21, the fixed storage battery 14 is charged while the mobile storage battery 21 is charged with the maximum charging power.
In the period from time T0 to T1a, since there is surplus power of solar power generation that is equal to or greater than the maximum charging power F3 of the mobile storage battery 21, the detected power value A (W of the fixed storage battery 14 from the detected power value B (W) of the mobile storage battery 21 ), And the difference between the surplus power amount of the photovoltaic power generation and the maximum charge amount of the mobile storage battery 21 is charged in the fixed storage battery 14.

And the charge amount of the fixed storage battery 14 decreases corresponding to the increase in power consumption. When the power consumption and the surplus power of the photovoltaic power generation match (time T1a), charging of the fixed storage battery 14 is stopped. Furthermore, due to the increase in power consumption, the detected power of the power detector 6 exceeds A (W), whereby the control device 13 discharges the fixed storage battery 14. The control device 13 discharges the fixed storage battery 14 so that the detected power detected by the power detector 6 is maintained at A (W). At this time, the mobile storage battery 21 is charged with the maximum charging power.
That is, since the control device 13 discharges the fixed storage battery 14 while maintaining the purchased power A (W), the power detector 5 detects the purchased power A (W), and thus the mobile storage battery 21 is charged. Since the charging operation of the mobile storage battery 21 seems to have increased the load amount when viewed from the fixed storage battery 14 (actual load amount + mobile storage battery charge amount), the control device 13 determines the fixed storage battery 14 with respect to the increased load. It works to discharge. In addition, the detected power detected by the power detector 5 of the mobile storage battery 21 is A (W), but the control device 23 performs the charging operation so that the detected power of the power detector 5 becomes B (W). Therefore, the mobile storage battery 21 is charged with the maximum charging power.
That is, when the detected power detected by the power detectors 6 and 5 is not the threshold (A (W), B (W)), the control devices 13 and 23 detect the detected power as A (W) and B (W). Thus, the charging / discharging operation is performed with the maximum power.

  In addition, during the period from time T1a to T2a, the power consumption increases, but this increase is covered by the discharge of the fixed storage battery 14, and the detected power of the power detector 5 maintains A (W). . For this reason, the mobile storage battery 21 is charged as it is.

  In the period from the time point T2a to T3a, the fixed storage battery 14 is not covered by the increase in power consumption. Therefore, when the power purchase from the system power supply E increases and the power purchase amount becomes B (W), the mobile storage battery The control device 23 of the charge / discharge device 20 decreases the charge amount of the mobile storage battery 21 so that the detected power of the power detector 5 is maintained at B (W).

  At time point T3a, the amount of charge of the mobile storage battery 21 becomes zero because power consumption = generated power of solar power generation + discharge power of the fixed storage battery 14. Due to the increase in power consumption thereafter, power purchase is further increased, and the detected power detected by the power detector 5 exceeds B (W). When the detected power detected by the power detector 5 exceeds B (W), as shown in the table of FIG. 3, the control device 23 switches the charging control of the mobile storage battery 21 to the discharge control, and discharges the mobile storage battery 21. To go. At this time, the control device 23 discharges the storage battery 21 so that the detected power detected by the power detector 5 is maintained at B (W).

  As described above, the switching from the charging operation to the discharging operation of the charge / discharge converters 12 and 22 is automatically performed in a predetermined order based on the detected power detected by the power detectors 5 and 6. There is no need to provide a central control unit for monitoring the discharge unit (storage unit) 10 or the mobile storage battery charging / discharging device (charging station) 20, and therefore the configuration of the power supply system S can be simplified.

  Moreover, since the discharge of the fixed storage battery 14 is preferentially performed over the discharge of the mobile storage battery 21, the electric vehicle EV is maintained in a state where it can run and can be used whenever it is desired to use it.

[Specific operation explanation]
Next, the specific operation of the power supply system S will be described based on the time charts shown in FIGS.

[Economic mode]
FIG. 5 shows a specific example of a time chart of the power supply system S when the economic mode is set by a remote controller (not shown). In the economic mode and the green mode, the charging operation of the fixed storage battery 14 and the mobile storage battery 21 is preferentially performed with the maximum output from the system power supply E in the period from 23:00 to 7:00. By this charging operation, as shown in FIG. 5, the mobile storage battery 21 is fully charged at 2 o'clock and the fixed storage battery 14 is fully charged at 3 o'clock. Further, during the period from 23:00 to 6 o'clock, the power consumption in the house is covered by the power of the system power supply E.
The control device 13 determines whether the fixed storage battery 14 is fully charged based on the voltage of the fixed storage battery 14. Similarly, the control device 23 determines whether the mobile storage battery 21 is fully charged based on the voltage of the mobile storage battery 21. Further, the control devices 13 and 23 also determine the discharge lower limit values of the fixed storage battery 14 and the mobile storage battery 21 based on these voltages.

  Moreover, the graph G1 of FIG. 5 is a graph which shows the power consumption in a house, and the graph G2 shows the electric power generated by photovoltaic power generation (PV1 + PV2).

  As shown in FIG. 5, power generation by solar power generation is started from 6 o'clock, and at 7 o'clock, the power consumption in the house is larger than the power generation power of solar power generation, so the fixed storage battery 14 is discharged and covered. .

  That is, if the detected power detected by the power detector 6 becomes A (W) due to the increase in power consumption and the increase in power purchase, the control device 13 of the charge / discharge unit 10 The fixed storage battery 14 is discharged so that the detected power detected by the detector 6 is maintained at A (W). This discharge will cover the power consumption.

  In the period from 8:00 to 16:00, the generated power of the solar power generation is larger than the power consumption in the house, so surplus power of the solar power generation is sold. This is because, when surplus power is generated in solar power generation, the power detectors 5 and 6 detect the power sale value, and in this case, the charging / discharging operation of the fixed storage battery 14 and the mobile storage battery 21 is not performed. is there. That is, when the detected power of the power detectors 5 and 6 is A (W) or less, the fixed storage battery 14 and the mobile storage battery 21 stand by as shown in the table of FIG.

  At 17:00, the power consumption in the house is larger than the power generated by the photovoltaic power generation, so that the fixed storage battery 14 is discharged to cover the power consumption. Also in this case, as described above, when power is purchased due to an increase in power consumption, and the detected power detected by the power detector 6 is A (W) due to the increase in power purchase, the charge / discharge unit 10 The control device 13 discharges the fixed storage battery 14 so that the detected power detected by the power detector 6 is maintained at A (W). In this case, since the power purchase is B (W) or less, the mobile storage battery 21 is not discharged. That is, the fixed storage battery 14 is discharged preferentially.

  At 19:00, since the remaining amount of the fixed storage battery 14 has reached the discharge lower limit value, the discharge of the fixed storage battery 14 is stopped. When the electric power purchase is increased due to the stop of the discharge and the detected power of the power detector 5 becomes B (W), the control device 23 of the mobile storage battery charging / discharging device 20 discharges the mobile storage battery 21. . In this case, the control device 23 discharges the mobile storage battery 21 so that the detected power of the power detector 5 is maintained at B (W).

  Even if the remaining amount of the fixed storage battery 14 does not reach the lower limit of discharge, if the discharge of the fixed storage battery 14 cannot be covered by the increase in power consumption, the power purchase increases and the detected power of the power detector 5 becomes B ( W), and the control device 23 starts discharging the mobile storage battery 21. In this case, the control device 23 discharges the mobile storage battery 21 so that the detected power of the power detector 5 maintains B (W).

  The discharging operation of the mobile storage battery 21 is performed until 22:00, and is stopped at 23:00, and the charging operation of the fixed storage battery 14 and the mobile storage battery 21 is performed with the maximum output from the system power supply E. These operations are repeated while the economic mode is set.

  As described above, when the power consumption in the house cannot be covered by only the power generated by the solar power generation, the control devices 13 and 23 are based on the detected power of the power detectors 6 and 5 and the fixed storage battery 14 and the mobile storage battery. Since the fixed storage battery 14 can be discharged preferentially only by controlling the charging / discharging of the battery 21, it is necessary to provide a central control unit for monitoring the charging / discharging unit 10 and the charging / discharging device 20 for mobile storage battery. Therefore, the configuration of the power supply system S can be simplified. Further, since the fixed storage battery 14 is discharged preferentially, the remaining amount of the mobile storage battery 21 is prevented from being reduced, and therefore the electric vehicle EV can be used at any time.

[Green Mode]
Next, the operation of the power supply system S will be described when the green mode is set.

  FIG. 6 shows a specific example of a time chart of the power supply system S when the green mode is set by a remote controller (not shown). In this example, night power use (night charge: charge from 23:00 to 7:00) is not set. Moreover, the graph G3 of FIG. 6 is a graph which shows the power consumption in a house, and the graph G4 shows the electric power generated by photovoltaic power generation (PV1 + PV2).

  In the period from 0 o'clock to 6 o'clock shown in FIG. 6, since the remaining amount of the fixed storage battery 14 of the charge / discharge unit 10 has reached the discharge lower limit value, the mobile storage battery 21 of the electric vehicle EV is discharged and the power consumption in the house is reduced. Will be covered. At 6 o'clock, power generation by solar power generation is started, and a part of the power consumption in the house is covered by the generated power of the solar power generation, and the shortage is covered by the discharge from the mobile storage battery 21.

  At 7 o'clock, the generated power of the solar power generation becomes larger than the power consumption in the house, and the mobile storage battery 21 is charged by the surplus power of the solar power generation. In this case, since the green mode is set, the control device 23 of the mobile storage battery charging / discharging device 20 moves the mobile storage battery 21 so that the detected power detected by the power detector 5 becomes B (W) for power purchase. Let's charge. That is, the mobile storage battery 21 is charged with priority. At this time, the fixed storage battery 14 is not discharged because the remaining amount of the fixed storage battery 14 has reached the discharge lower limit.

  At 8 o'clock, the electric vehicle EV goes out, so the fixed storage battery 14 is charged. When the electric vehicle EV is out, the green mode and the economic mode are canceled, so that the fixed storage battery 14 is charged with the generated power of solar power generation, which is a normal operation, and the power is sold with surplus power. become.

  At 9 o'clock, the electric vehicle EV returns, is connected to the mobile storage battery charging / discharging device 20, and the green mode is set again by the user. In addition, at 9 o'clock, the mobile storage battery 21 is charged with surplus power of solar power generation.

In this case, the control device 23 of the mobile storage battery charging / discharging device 20 charges the mobile storage battery 21 so that the detected power detected by the power detector 5 becomes A (W) for power purchase. The detected power of 6 is also A (W). This is a state in which the fixed storage battery 14 is charged and the power consumption (load) in the house and the mobile storage battery 21 can be charged with the maximum charging power by the generated power of the photovoltaic power generation and the discharge of the fixed storage battery 14. (Corresponding to T1a to T2a in FIG. 4). Depending on the magnitude relationship between the generated power of solar power generation and the load, the detected power of the power detector 6 may be B (W) (corresponding to T2a to T3a in FIG. 4).
The control device 13 of the charge / discharge unit 10 discharges the fixed storage battery 14 as shown in the table of FIG. 3 when the power detector 6 detects A (W). The mobile storage battery 21 is charged by this discharge. The same applies when the power detector 6 detects B (W). That is, the mobile storage battery 21 is charged with surplus power of solar power generation and discharge power of the fixed storage battery 14. That is, the mobile storage battery 21 is preferentially charged.

  At 11:00, the mobile storage battery 21 is fully charged and charging of the mobile storage battery 21 is stopped. At 12:00, the control device 13 of the charge / discharge unit 10 charges the fixed storage battery 14 based on the detected power of the power detector 6 so as not to be in a power sale state. That is, the fixed storage battery 14 is charged so that the detected power detected by the power detector 6 becomes A (W) for power purchase.

  At 12:00, the generated power of the solar power generation is larger than the power consumption in the house plus the charging power of the fixed storage battery 14, and the surplus power of the generated power is sold. That is, if the amount of power generated by photovoltaic power generation is greater than the amount of power consumed in the home plus the maximum amount of power charged by the fixed storage battery 14, the surplus power is sold.

  Thus, at 12 o'clock, charging of the fixed storage battery 14 and selling of surplus power of solar power generation are performed. In this case, the fixed storage battery 14 is charged with the maximum charging power because the detected power of the power detector 6 does not become A (W) for power purchase. Similarly, charging of the fixed storage battery 14 and selling of surplus power of solar power generation are performed at 13:00.

  At 14:00, when the electric vehicle EV goes out and the fixed storage battery 14 is fully charged, all of the surplus power of the photovoltaic power generation is sold.

  At 15:00, the electric vehicle EV returns and the green mode is set again by the user, whereby the mobile storage battery 21 is charged. This is because the mobile storage battery 21 is charged when the mobile storage battery 21 is discharged and the full charge is eliminated. In this case, the control device 23 charges the mobile storage battery 21 so that the detected power detected by the power detector 5 in the green mode becomes B (W) for power purchase, but there is surplus power for solar power generation. As a result, power is sold. Specifically, when the electric vehicle EV returns, the mobile storage battery 21 is charged as B (W) for power purchase, and the fixed storage battery 14 is fully charged at 13:00, so the mobile storage battery 21 is fully charged. Later, surplus electricity from solar power generation was sold. For this reason, the detected power of the power detector 6 becomes A (W) or less, and the control device 13 charges the fixed storage battery 14. However, the fixed storage battery 14 is fully charged, so that the fixed storage battery 14 is charged. Not done.

  At 15:00, surplus power from solar power generation is sold. That is, power sales and charging of the mobile storage battery 21 are performed.

  At 16:00, the power generated by the solar power generation becomes smaller than the power consumption in the house, and the power purchase state is entered. For this reason, the control apparatus 13 discharges the fixed storage battery 14 so that the detection electric power of the electric power detector 6 may maintain A (W) of electric power purchase, and will cover the shortage of the generated electric power of photovoltaic power generation. At this time, the electric vehicle EV is out and the green mode is canceled.

  Then, at 18:00, the electric vehicle EV returns and the green mode is set again. By setting this green mode, the control device 23 of the mobile storage battery charging / discharging device 20 charges the mobile storage battery 21 so that the detected power detected by the power detector 5 maintains B (W) for power purchase. I will let you. On the other hand, the control device 13 of the charge / discharge unit 10 discharges the fixed storage battery 14 with the maximum power because the detected power of the power detector 6 is B (W). As a result, the power consumption in the house and the charging of the mobile storage battery 21 are covered by the discharge of the fixed storage battery 14, and the mobile storage battery 21 is preferentially charged.

  In addition, at 18 o'clock, the mobile storage battery 21 is fully charged, and the charging is stopped. At 19:00, only the power consumption in the house is covered by the discharge of the fixed storage battery 14.

  At 20:00, the remaining amount of the fixed storage battery 14 reaches the discharge lower limit value, and thereby the discharge of the fixed storage battery 14 is stopped. For this reason, it is discharged from the mobile storage battery 21 of the electric vehicle EV to cover the power consumption in the house. In this case, with the stop of the discharge of the fixed storage battery 14, the power purchase further increases from the power purchase state of A (W), and the detected power detected by the power detector 5 reaches B (W). The control device 23 of the discharge device 20 discharges the mobile storage battery 21 so that the detected power detected by the power detector 5 maintains B (W) for power purchase, and power consumption in the house is covered.

  During the period from 21:00 to 23:00, the mobile storage battery 21 is discharged in the same manner as described above to cover power consumption in the house.

  While the green mode is set, the above operation is repeated.

  As described above, the control devices 13 and 23 control the charging / discharging of the fixed storage battery 14 and the mobile storage battery 21 based on the detected power detected by the power detectors 6 and 5, and give priority to the mobile storage battery 21. Therefore, the fixed storage battery 14 can be preferentially discharged, and there is no need to provide a central control unit for monitoring the charge / discharge unit 10 or the mobile storage battery charge / discharge device 20. For this reason, the configuration of the power supply system S can be simplified. In addition, since the mobile storage battery 21 is preferentially charged, it is possible to prevent a situation in which the electric vehicle EV cannot be used (traveled) when necessary.

  In the above embodiment, priority is given to discharging the fixed storage battery 14 in the economic mode, and priority is given to charging the mobile storage battery 21 in the green mode. However, the present invention is not limited to this. For example, the capacity of the mobile storage battery 21 is considerably large. Or vice versa. In this case, the threshold value may be reversed. Moreover, although two photovoltaic power generation systems are provided, only one of them may be used.

  In the above embodiment, the two power detectors 5 and 6 are provided. However, either one of the power detectors may be provided and used in combination.

  The present invention is not limited to the above-described embodiments, and design changes and additions are permitted without departing from the scope of the claimed invention.

2 Power supply line 4 Branch point 5,6 Power detector 12 Charge / discharge converter (charge / discharge converter for fixed storage battery)
13 Control device (first control device)
14 fixed storage battery 21 mobile storage battery 20 charge / discharge device for mobile storage battery 22 charge / discharge converter (charge / discharge converter for mobile storage battery)
23 Control device (second control device)
30 Solar power generation system (natural energy power generation system)
S Power supply system Q1-Qn Home load R1-R3 Home load E System power supply EV Electric vehicle

Claims (3)

A fixed storage battery charge / discharge device having a fixed storage battery charge / discharge converter for charging / discharging the fixed storage battery installed at a predetermined position, and a first control device for controlling the charge / discharge of the fixed storage battery charge / discharge;
A mobile storage battery charge / discharge device having a mobile storage battery charge / discharge converter for charging / discharging a mobile storage battery mounted on a mobile body, and a second control device for controlling charge / discharge of the mobile storage battery charge / discharge converter;
With a natural energy power generation system,
The fixed storage battery and the mobile storage battery can be charged with the system power of the system power supply or the generated power of the natural energy power generation system by the control of the first control device and the second control device. An electric power supply system capable of supplying electric power charged to the home load,
A power detector is provided for detecting the supply power supplied from the system power supply to a branch point divided from the power supply line of the system power supply to the charging / discharging device for the fixed storage battery and the charge / discharge device for the mobile storage battery,
The first control device and the second control device perform charge control or discharge control of the fixed storage battery and the mobile storage battery based on detected power detected by the power detector,
A first threshold for preventing charge control or discharge control by the first control device and power reverse flow to the system power supply, charge control or discharge control by the second control device, and power reverse flow to the system power supply The fixed storage battery and the mobile storage battery are automatically charged and discharged in a predetermined priority order according to the detected power detected by the power detector. Power supply system. The second threshold is set to be greater than the first threshold;
When having a first mode to obtain economic efficiency and this first mode is set,
When the detected power detected by the power detector is smaller than the first threshold, the first control device and the second control device make the fixed storage battery and the mobile storage battery stand by,
When the detected power detected by the power detector becomes equal to or higher than the first threshold due to an increase in power consumption of the home load, the second control device keeps the mobile storage battery on standby, and the first control device , Discharging the fixed storage battery so that the detected power detected by the power detector maintains the first threshold,
When the detected power detected by the power detector becomes equal to or higher than the second threshold due to a further increase in power consumption of the home load, the first control device maintains the discharge of the fixed storage battery while maintaining the second 2. The power supply system according to claim 1, wherein the control device discharges the mobile storage battery so that detection power detected by the power detector maintains the second threshold value. 3. The second threshold is set to be greater than the first threshold;
When there is a second mode for the purpose of self-sufficiency of power and this second mode is set,
When the detected power detected by the power detector is smaller than the first threshold, the first control device and the second control device charge the fixed storage battery and the mobile storage battery,
When the detected power detected by the power detector becomes equal to or greater than the first threshold due to an increase in power consumption of the home load, the second control device maintains the charge of the mobile storage battery and the first control device. Discharges the fixed storage battery so that the detected power detected by the power detector maintains the first threshold,
When the detected power detected by the power detector becomes equal to or greater than the second threshold due to further increase in power consumption of the home load, the first control device maintains the discharge state of the fixed storage battery while maintaining the discharge state of the fixed storage battery. 2. The power supply system according to claim 1, wherein the control device discharges the mobile storage battery so that the detected power detected by the power detector maintains the second threshold value.