JP3759151B1 - Power storage system - Google Patents

Power storage system Download PDF

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JP3759151B1
JP3759151B1 JP2004333686A JP2004333686A JP3759151B1 JP 3759151 B1 JP3759151 B1 JP 3759151B1 JP 2004333686 A JP2004333686 A JP 2004333686A JP 2004333686 A JP2004333686 A JP 2004333686A JP 3759151 B1 JP3759151 B1 JP 3759151B1
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power
means
commercial
load
storage system
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JP2006149037A (en
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信行 江崎
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株式会社正興電機製作所
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion electric or electronic aspects
    • Y02E10/58Maximum power point tracking [MPPT] systems
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

Provided is a power storage system capable of suppressing the effective use of nighttime power and the use of daytime power even when there is a power demand exceeding the output capacity from a load.
SOLUTION: A bidirectional power converter 2 functioning as a converter when charging a storage battery 30 and functioning as an inverter when discharging, and is provided between a commercial power, the bidirectional power converter 2 and a load 40 to supply power. Power selection means 1 for selecting, control means 4 for controlling the power selection means 1, and solar power generation A 51, and charging the storage battery 30 from commercial power and load 40 during night charge application time zone In the daytime, power is supplied only from the storage battery 30 according to the power consumption of the load 40, and the surplus power of the photovoltaic power generation A51 is reversely flowed to the commercial power side so that the power consumption of the load is predetermined. When the value is greater than or equal to the value, the power storage system supplies power from the storage battery 30 up to that value, and supplies the shortage from the commercial power source or solar power generation A51.
[Selection] Figure 1

Description

The present invention makes it possible to reduce the electricity bill and level the load by using the contract menu for each time zone of the power company, storing the nighttime power, and discharging it in a time zone other than the nighttime power supply time zone. In addition, the present invention relates to a power storage system that can store solar power generation, wind power generation, and the like and contribute to CO 2 reduction.

  In electric power companies, power generation is controlled by predicting power demand by setting power generation capacity by nuclear power, hydropower, thermal power generation, etc. so that it can cope with peak power consumed during daytime or at specific times. is doing. The demand for electric power is increasing in urban areas, and the increase in peak electric power has led to an increase in the burden of constructing new power generation facilities. On the other hand, at night, the power usage rate decreases because the power usage in factories and offices decreases. A nighttime electricity use discount discount system is being implemented to equalize the large gap between daytime and nighttime electricity demand. Nighttime electricity is cheaper than daytime electricity and has a low use rate of fossil fuels, so it emits less carbon dioxide and is convenient for global environmental conservation.

  There are two methods for using nighttime electricity: a method of storing power itself, a method of storing it by converting it into thermal energy such as hot water supply equipment and ice heat storage, or a method of storing it as location energy, such as pumped-storage power generation. It is considered. Among them, a typical method for storing power is a power storage system that stores nighttime power in a storage battery and consumes the power from the storage battery during daytime when the power load is large. According to this power storage system, there is an effect of reducing the electricity usage fee for the consumer, and it is possible to level the power system at the bottom-up at night and by suppressing peak power during the daytime.

However, it naturally occurs that daytime power consumption is larger than the capacity of the storage battery.
As a countermeasure when such a power supply exceeding the storage capacity is performed on the load, it is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-308282 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2000-295784 (Patent Document 2). If the system switching means is provided and the load exceeds the capacity of the storage battery, the power supply to the load is switched from the storage battery to the commercial power.

  As another countermeasure, for example, as disclosed in Japanese Patent Application Laid-Open No. 2001-008385 (Patent Document 3), several types of storage battery discharge patterns for one day are stored in advance, and the user selects the pattern appropriately. By doing so, there is an electric power storage system that uses the nighttime electric power charged in the storage battery effectively and without waste.

  Japanese Patent Application Laid-Open No. 10-201129 (Patent Document 4) and Japanese Patent Application Laid-Open No. 10-201130 (Patent Document 5) disclose the use of solar cells for daytime charging of storage batteries.

Further, Patent Document 6 uses a bidirectional DC-DC converter and a two-winding electronic transformer using at least one of a wind power generator, a solar power generator, and a fuel cell, a storage battery, and a commercial AC power supply. In addition, a distributed power supply system that performs distributed power supply to an alternating-current dedicated load without or via it is disclosed.
In this system,
(1) At the time of full charge of the storage battery or power failure of the commercial AC power supply, DC power from the DC power source and the storage battery is generated by using a bidirectional DC-DC converter and a two-winding electronic transformer to generate a sine wave AC output. Supply to AC dedicated load,
(2) When the discharge of the storage battery proceeds, power is supplied from the wind power generator, the solar power generator and the fuel cell to the storage battery,
(3) During the night and midnight power supply hours, AC power from the commercial AC power source is supplied to the AC dedicated load and the storage battery is charged.
(4) When the storage battery is near full charge at light load and the commercial AC power supply is not a power outage, the DC power is converted to AC so as to flow backward to the commercial AC power supply side.

JP 2000-308282 A JP 2000-295784 A JP 2001-008385 A JP-A-10-2011129 JP-A-10-201130 JP 2004-80987 A

As described above, in the power storage systems proposed in Patent Documents 1 to 5, when the storage power of the storage battery connected to the load is reduced, it becomes impossible to meet the load power requirement, so the load is switched to commercial power or the like. Is supplying power. However, there has been a situation where the power stored in the cheap nighttime electricity rate zone cannot be used up effectively, and the power of the daytime electricity rate has been used, and the purpose of the power storage system has not been sufficiently achieved.
Further, in the distributed power supply system disclosed in Patent Document 6, stable power such as natural energy power (wind power generator, solar power generator) and fuel cell is used for charging the storage battery, and the storage battery is fully charged. The battery is charged with natural energy power until it reaches the load, and a load is supplied with commercial power during charging, and the reverse power flow to the commercial AC power source is performed from the storage battery at light load. Therefore, in addition to supplying power to the load, power for reverse power flow is consumed from the storage battery, and power to be supplied to the load after sunset is also consumed. If it does so, it will be in the situation where the capacity | capacitance of a storage battery falls and must be covered with commercial power in the time zone of a normal charge before going into a night electricity rate zone, and there exists a problem that the usage-amount of daytime electricity increases. Currently, it is not allowed to reverse the stored night / midnight power to commercial power in domestic power sale contracts. For this reason, it is not permitted to charge the same storage battery with the stored power and the commercial power from the natural energy power, the fuel cell, etc., and reversely flow it to the commercial power.

  Therefore, the present invention suppresses the effective use of nighttime power and the use of daytime power by effectively using the power stored in the power storage means even when there is a power demand exceeding the output capacity from the load. In addition, by installing a solar power generation means, surplus power generated by the solar power generation means flows backward to the commercial power side, and enjoys power leveling and economic merit at the peak of power usage due to power sales. An object of the present invention is to provide a power storage system capable of performing the above.

  In order to solve the above problems, a power storage system according to the present invention includes a rectifying unit that converts commercial power into DC power, a power storage unit that stores rectified DC power, and a DC power stored in the power storage unit. Power conversion means for converting to AC power substantially equal to the voltage and frequency of commercial power, and power selection for selectively supplying the commercial power and the AC power converted by the power conversion means to a load by switching a plurality of switches Means, a control means for controlling a plurality of switches of the power selection means, and a power receiving device for the commercial power and the power selection means. Solar power generation means for converting into alternating-current power substantially equal to the power, and the control means is configured to store the power storage means from the commercial power via the rectification means during night charge application time zone. In a night operation mode for supplying power to the load and supplying power to the load, and in a time zone other than the night charge application time zone, when the power consumption of the load is less than a predetermined value, the power storage means only A discharge operation mode in which power is supplied to the load and surplus power from the solar power generation means flows backward to the commercial power side, and when the power consumption of the load is equal to or greater than the predetermined value, the predetermined value Power is supplied from the power storage means, and the plurality of switches are turned on in accordance with each mode of the system replenishment operation mode in which power consumption exceeding the predetermined value is supplied from the commercial power and the solar power generation means. It is something to control.

  In the present invention, when discharging from the power storage means other than the night charge applicable time zone, even when there is a power request from the load more than the output capacity, by effectively using the power stored in the power storage means, Effective use of nighttime power and daytime power can be suppressed. In addition, by providing the solar power generation means, surplus power generated by the solar power generation means can be reversely flowed to the commercial power side to be sold. Thereby, while using cheap night electric power effectively, the electric power leveling at the time of electric power use peak and economic merit can be enjoyed by electric power sale.

  By making the rectifying means and the power conversion means a bidirectional power converter having both functions, the power storage means operates as a converter during the charging operation, and discharges power from the power storage means to the load. During operation, it is controlled to operate as an inverter.

  The power selection means includes a first switch connected between commercial power and the power conversion means, a second switch connected between commercial power and a load, the power conversion means, and the first switch. The power conversion means is always connected to the load, and the control means switches the switches and electronic switch means according to the modes. As a result, power from two power sources can be supplied to the load in parallel.

  Further, by providing an electronic switch means for cutting off the commercial power from the power conversion means and the commercial power side on the commercial power side of the connection point between the output section of the power storage means and the commercial power, the output of the power storage means and the commercial power are supplied during the commercial power supply. The electric power is supplied to a predetermined load while sharing the current at the same time, a power failure of the commercial power is detected, the electronic switch means is immediately opened, and the output control of the power storage means can be operated independently. The load current can be controlled to be supplied by the power storage means. As a result, it is possible to prevent a reverse power flow to the commercial system that occurs when the power storage means is operated independently.

The power storage unit can be configured to supply power from an external power generation unit such as solar power generation or wind power generation, thereby suppressing the generation of CO 2 and improving the global environment.

  As described above, according to the present invention, when the power consumption of the load is greater than or equal to the predetermined value in the time zone other than the nighttime charge application time zone, the commercial power and the power supply from the power storage means to the load By providing a function to perform the power in parallel, even when there is a power demand exceeding the output capacity from the load, by effectively using the power stored in the power storage means, it is possible to effectively use nighttime power and daytime power. Can be suppressed. In addition, by providing the solar power generation means, surplus power generated by the solar power generation means can be reversely flowed to the commercial power side to be sold. Thereby, while using cheap night electric power effectively, the electric power leveling at the time of electric power use peak and economic merit can be enjoyed by electric power sale.

  By making the rectifier means and the power converter means a bidirectional power converter having both functions, it operates as a converter during the charging operation of the power storage means, and also during the discharge operation of power from the power storage means to the load. Is controlled to operate as an inverter.

  By configuring the power selection means with the first and second switches and the electronic switch means, it is possible to supply power from two power sources in parallel to the load.

  A commercial system that occurs when a power failure occurs on the commercial power side by providing an electronic switch means that cuts off the commercial power between the commercial power and the power storage means when the power storage means operates independently. It is possible to prevent reverse power flow to

  Hereinafter, embodiments of the power storage system of the present invention will be described with reference to FIGS.

  FIG. 1 is a block diagram (single line diagram) showing a configuration of an embodiment of a power storage system according to the present invention. In the figure, the power storage system according to the present embodiment includes a power receiving device 50 that receives power from commercial power and a power selection unit that switches power supply from a storage battery 30 constituting the power storage unit 3 to a load 40 via a distribution board 10. 1 and a converter that converts AC power (commercial power) from the power receiving device 50 into DC power for charging the storage battery 30 and an inverter that converts DC power stored in the storage battery 30 into AC power. Provided between the power receiving device 50 and the power selection means 1, the power storage means 3 comprising the storage battery 30, the control means 4 for controlling the power selection means 1 and the bidirectional power converter 2, And a reverse power flow prevention circuit 53 for preventing a reverse power flow from the storage battery 30 side to the commercial power side through the power receiving device 50. In the figure, 5 is a magnet switch, 6 is a switching drive unit, 13 is a capacitor, 14 is a transformer, 15 is a switching element, 52 is a photovoltaic power generation B, and 54 is a solar charging circuit.

  The power selection means 1 includes two systems of changeover switches MS1 and MS2 and electronic switches Q5 and Q6 formed of switching elements such as thyristors. The changeover switches MS1 and MS2 are controlled to be opened and closed by a magnet switch 5. The magnet switch 5 and the electronic switches Q5 and Q6 are controlled by the control means 4.

  The main converter of the bidirectional power converter 2 is constituted by the switching element 15 so that it operates as a converter during the charging operation of the storage battery 30 and when power is supplied from the storage battery 30 to the load 40 in a discharging operation. It is controlled by the control means 4 and the switching drive unit 6 so as to operate as an inverter. By controlling the switching element 15 in this way, the alternating current waveform of the bidirectional power converter 2 is controlled to coincide with the sine wave of the commercial voltage, thereby enabling bidirectional power conversion that can be charged and discharged.

Specifically, the following switching control is performed.
(1) Enter the switching element 15 and give a switching command to perform a switching operation to make the input voltage pulsed.
(2) Control is performed so that this pulse becomes a sine wave in an arbitrary interval.
(3) This sine wave is converted to a direct current by smoothing the waveform generated by switching at the time of charging with a capacitor (not shown), and the output voltage is changed to a sine wave at the time of discharging.
(4) This control enables bidirectional power conversion in the bidirectional power converter 2.

  Further, when the pulse width during switching control is increased, the current and voltage increase, and when the pulse width is decreased, the current and voltage decrease. The power storage means 3 is charged with a constant current with an arbitrary current. When the amount of electricity is close to charging, the pulse width is reduced to reduce the charging current, and charging is performed until the amount of charging electricity is completed. In this manner, the charging current value is controlled step by step to control the optimum amount of electricity stored in the storage battery 30. The discharge power and the load power can be monitored, the pulse width can be changed, and the inverter output voltage can be changed to control the discharge of the power storage means 3.

  The bidirectional power converter 2 is provided with a smoothing capacitor (not shown), and charges the storage battery 30 by smoothing the charging current. In addition, a transformer 14 is provided between the power selection unit 1 and the bidirectional power converter 2 so that the voltage is reduced when the storage battery 30 is charged and increased when the storage battery 30 is discharged. In addition, this transformer leak reactance is used to form a filter with the capacitor 13 to reduce higher-order harmonics generated during power conversion by the bidirectional power converter 2.

The storage battery 30 is provided with solar power generation B52, but external power generation such as wind power generation and hydrogen battery can also be connected. Thereby, it is possible to store solar power, wind power, etc., which are natural energy, and to contribute to CO 2 reduction by using a hydrogen battery, etc., which is clean energy.

  The control means 4 is constituted by a CPU in this embodiment, and controls each switch of the power selection means 1 based on the voltage and current of commercial power, the output voltage and current, the voltage of the storage battery, and the time information of the internal timer. In addition, the inverter function and the converter function of the bidirectional power converter 2 are controlled.

  In the commercial operation and charging operation modes, the changeover switch MS1 and the electronic switch means Q5, 6 are closed. Since the bidirectional power converter 2 is not operated in the commercial operation mode, power is only supplied to the load side. In the charging operation mode, the bidirectional power converter 2 is operated as a converter for charging, so that power is supplied to the storage battery 30 and the load. In the discharge operation mode, since the electronic switch means Q5 and 6 are opened, power is fed only from the bidirectional power converter 2.

  In the grid replenishment operation mode, when the domestic load 40 is less than 3 kW, for example, power is supplied by the autonomous operation of the power storage system. At this time, the photovoltaic power generation A51 is disconnected from the power storage system by the changeover switch MS1, and all generated power is sold to the system. The power storage system can charge the reduced stored power by installing another photovoltaic power generation B52 and connecting it to the storage battery 30 via the solar charging circuit 54. Furthermore, when the household load 40 becomes 3 kW or more, for example, the changeover switch MS2 is set to “ON”, and the insufficient power from the power storage system is supplied from the photovoltaic power generation A51. In this case, the power discharged from the power storage system is not discharged to the commercial side by the reverse power flow prevention circuit 53. Further, when the load power is insufficient, power is supplied from a commercial power source. Thus, the power saving effect and the electricity charge reduction effect can be enhanced by effectively using the generated power of the solar power generation A51 and B52 and the stored power of the power storage system.

  Next, the operation in the present embodiment will be described with reference to the flowchart of FIG. 2 and the system connection diagrams of FIGS. 3 and 4, 55 is a solar cell module array for the photovoltaic power generation A51, and 56 is a power conditioner that converts the DC power generated in the solar cell module array 55 into an AC voltage for load.

  In step 600 shown in FIG. 2, it is determined whether or not it is a discharge start time zone, that is, a time zone other than the night charge time zone. This is possible by measuring time using a timer (not shown) inside the CPU of the control means 4. If it is the discharge start time zone, it is determined in step 610 whether or not the discharge start condition is satisfied. In this example, the discharge start conditions are the remaining battery power, the storage battery temperature, and the discharge time zone.

  If the condition is satisfied, it is determined in step 620 whether the load power is equal to or greater than a set value (3 kW in this example). If it is less than the set value, in step 630, the changeover switch MS1 and the electronic switches Q5, 6 of the power selection means 1 are opened, and the discharge operation mode only from the storage battery 30 is set (FIG. 3). At this time, the photovoltaic power generation A is disconnected from the power storage system, and all the generated power is sold in reverse power to the system. If the load power is equal to or higher than the set value (3 kW in this example), in step 640, all the selector switches MS1 and the electronic switches Q5 and 6 of the power selection means 1 are turned on, and from the commercial power / solar power / battery for the discharge operation. It is set as the system replenishment operation mode which supplies the electric power (FIG. 4). When the operation mode is determined, discharge operation output control in step 650 is performed.

In step 660, the discharge operation continuation conditions such as the remaining battery capacity, storage battery temperature, and discharge time zone are monitored. If not established, in step 670, discharge operation stop and discharge amount recording processing are performed. For this, the discharge amount monitoring process in step 680 is always performed. In step 690, the inverter output is stopped while the changeover switch MS1 and the electronic switches Q5 and 6 of the power selection means 1 are closed, and the power distribution switching is set as the power supply by the commercial / solar power generation A.
Note that the photovoltaic power generation B52 can always charge the storage battery 30 when the sunshine condition is satisfied separately from the operation by the commercial / solar power generation A51.

2. Unsteady operation When a power failure occurs in step 200 shown in FIG. 5, the current operation state is determined in step 210. If it is in the charging mode, in step 220, a non-stationary process is performed during charging operation. If it is in the discharge mode (including the system replenishment operation mode), in step 230, non-stationary processing during discharge operation is performed. If the operation mode is the commercial operation mode, in step 240, unsteady processing during commercial operation is performed. In step 250, the depth of discharge is determined. If the depth of discharge is exceeded, the equal charge request flag is set at step 260.

That is,
(1) In unsteady operation, the power storage capacity is reduced by supplying power from the storage battery to the load, and the operation of step 260 is executed when the depth of discharge is reached. During this time, commercial use is out of service.
(2) When commercial power returns from a power failure, the system shifts from unsteady operation to steady operation (commercial operation). If the flag is set at this time, charging is performed during the charging time period.
In step 270, the occurrence of a power failure is recorded.

3. Charge control (1)
In step 300 shown in FIG. 6, it is determined whether it is a charging time zone. If it is in the charging time zone, it is determined whether charging is required in step 310. If charging is required, in step 320, the changeover switch MS1 and the electronic switches Q5, 6 of the power selection means 1 are turned on to turn on the bidirectional power converter 2. Charging from commercial power via

4). Battery Temperature Monitoring In step 400 of FIG. 7, the temperature at the start of charging is recorded. In step 410, the current battery temperature value measured by a temperature sensor (not shown) is compared with the temperature at the start of charging.
In step 420, it is determined whether charging has been completed. If charging has not been completed, it is determined whether there has been a temperature increase of 6 ° C. or more. If there is a temperature increase, a charge stop flag is set in step 440 to stop charging. To do.

5. Charge control (2)
In step 500 of FIG. 8, battery voltage detection and battery temperature detection processing is performed. In step 510, various charging amounts are set.
Here, the various charging amounts refer to current value settings when charging is performed by gradually reducing the charging current value until the amount of charging electricity is reached when performing the charging operation.
Next, constant current charging is performed in step 520. In step 530, it is determined whether or not the amount of charged electricity has been reached. If it has been reached, battery voltage determination processing is performed in step 540.

  FIG. 9 is a comparison of surplus power of solar power generation, where (a) shows a conventional example, and (b) shows a time change of surplus power when this embodiment is used. As described above, the combined use of the solar power generation A51 and B52 significantly increases the surplus power. By using this for charging the storage battery or selling the power, the power charge reduction effect and the load leveling are greatly contributed. be able to.

  The present invention can store electric power at night and discharge it in a time zone other than the supply time zone of night electric power, thereby reducing the electricity bill and leveling the load. It can be used as a power storage system that can flow backward to the side.

1 is a block diagram (single line diagram) showing a configuration of an embodiment of a power storage system according to the present invention. It is a flowchart which shows operation | movement of the control means in embodiment of this invention. It is explanatory drawing of each operation mode in embodiment of this invention. It is explanatory drawing of each operation mode in embodiment of this invention. It is a flowchart which shows operation | movement of the control means in embodiment of this invention. It is a flowchart which shows operation | movement of the control means in embodiment of this invention. It is a flowchart which shows operation | movement of the control means in embodiment of this invention. It is a flowchart which shows operation | movement of the control means in embodiment of this invention. It is explanatory drawing which compared the surplus electric power of the solar power generation in the former and embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric power selection means 2 Bidirectional power converter 3 Power storage means 4 Control means 5 Magnet switch 6 Switching drive part 10 Distribution board 13 Capacitor 14 Transformer 15 Switching element 30 Storage battery 40 Load 50 Power receiving apparatus 51 Solar power generation A
52 Solar Power B
53 Reverse Power Flow Prevention Circuit 54 Solar Charging Circuit 55 Solar Cell Module Array 56 Power Conditioner

Claims (5)

  1. Rectifying means for converting commercial power into DC power, power storage means for storing the rectified DC power, and power for converting DC power stored in the power storage means into AC power substantially equal to the voltage and frequency of the commercial power Controlling the conversion means, the power selection means for selectively supplying the commercial power and the AC power converted by the power conversion means to a load by switching a plurality of switches, and controlling the plurality of switches of the power selection means A photovoltaic power generation means connected between the control means, the commercial power receiving device and the power selection means, for converting the power generated by the photovoltaic power into alternating current power substantially equal to the voltage and frequency of the commercial power. ,
    The control means includes a night operation mode for supplying power from the commercial power to the power storage means via the rectifying means and supplying power to the load during the night charge application time zone, and other than the night charge application time zone. In the time zone, when the power consumption of the load is less than a predetermined value, power is supplied to the load only from the power storage means, and surplus power from the solar power generation means is reversely flowed to the commercial power side. And when the power consumption of the load is greater than or equal to the predetermined value, the power consumption up to the predetermined value is supplied from the power storage means, and the power consumption greater than or equal to the predetermined value is the commercial power And a power storage system that controls the plurality of switches in accordance with each mode of a system replenishment operation mode in which power is supplied from the solar power generation means.
  2.   The power storage system according to claim 1, wherein the rectifying means and the power conversion means are bidirectional power converters having both functions.
  3.   The power selection means includes a first switch connected between commercial power and the power conversion means, a second switch connected between commercial power and a load, the power conversion means, and the first switch. The power conversion means is always connected to the load, and the control means switches the switches and electronic switch means according to the modes. The power storage system according to claim 1, wherein the power storage system is a power storage system.
  4.   4. The electronic switch unit that cuts off the power conversion unit and the commercial power is provided on the commercial power side of the connection point between the output unit of the power storage unit and the commercial power. 5. Power storage system.
  5.   The power storage system according to any one of claims 1 to 4, wherein the power storage unit is configured to supply electric power from an external power generation unit such as solar power generation or wind power generation.
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