JP2016140123A - Device and method for charge/discharge control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique enabling the execution of appropriate charging control in the event of a disaster.SOLUTION: A charge/discharge control device 120 includes: a first sensor 123 which detects at least one action of a vibration and a shock; a second sensor 121a which detects a system power of an electric power system; and a control unit 122. When an occurrence of a disaster is determined according to a detection result of the first sensor 123, the control unit 122 suspends charge control and discharge control. After the suspension, when a disaster is determined to be calmed down according to a detection result of the first sensor 123, and the system power detected by the second sensor 121a is normal, the suspension of the charge control is canceled.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a charge / discharge control apparatus and method for performing charge control for charging power supplied from an electric power system to a storage battery and discharge control for permitting discharge of the storage battery to supply power to a load.

  Awareness of disaster countermeasures has risen since the Great East Japan Earthquake, and interest in household energy management that enables stable power supply in the event of a disaster is increasing. As a specific example thereof, a system has been proposed in which a power storage system having a storage battery linked to a power system is installed in a general household so that the power of the storage battery is supplied to household appliances and lighting even during a power failure.

  Generally, when a power failure occurs due to a disaster or the like, a power conditioner that manages the power of the storage battery performs control to supply the power of the storage battery to a load such as a household appliance instead of the power system. Thereby, it becomes possible to use electricity at home in the event of a power failure, but in order to realize this, it is preferable that the storage battery is sufficiently charged in the event of a power failure.

  Therefore, a technique has been proposed in which information indicating a sign of a power failure is acquired and electric power is stored in a storage battery in advance based on the information (for example, Patent Document 1).

JP 2012-235541 A

  However, the technique disclosed in Patent Document 1 cannot perform appropriate charge control in consideration of secondary disaster countermeasures when a vibration or impact occurs as an unpredictable disaster such as an earthquake. There was a problem.

  Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to provide a technique capable of performing appropriate charge control at the time of a disaster.

  A charge / discharge control device according to the present invention performs charge control for charging power supplied from an electric power system to a storage battery, and discharge control for permitting discharge of the storage battery to supply power to a load. A disaster has occurred based on a first sensor that detects at least one of vibration and impact, a second sensor that detects system power of the power system, and a detection result of the first sensor. The charging control and the discharging control are stopped, and after the stop, it is determined that the disaster has been cured based on the detection result of the first sensor, and the detection is performed by the second sensor. A control unit that cancels the stop of the charging control when the system power is normal.

  The charge / discharge control method according to the present invention is a charge / discharge control method that performs charge control for charging power supplied from an electric power system to a storage battery, and discharge control for permitting discharge of the storage battery to supply power to a load. And (a) stopping the charge control and the discharge control when it is determined that a disaster has occurred based on the detection result of at least one of vibration and impact, and (b) After the step (a), when it is determined that the disaster has been cured based on the detection result of the action, a step of detecting system power of the power system, and (c) detected in the step (b) A step of canceling the suspension of the charging control when the system power is normal.

  According to the present invention, it is possible to perform appropriate charging control at the time of a disaster.

It is a block diagram which shows an example of a structure of the charging / discharging system which concerns on Embodiment 1. FIG. 3 is a flowchart illustrating an example of charge / discharge power control of the power storage power conditioner according to the first embodiment. 3 is a diagram illustrating a display example of a power storage power conditioner according to Embodiment 1. FIG. 3 is a diagram illustrating a display example of a power storage power conditioner according to Embodiment 1. FIG.

<Embodiment 1>
Hereinafter, the charge / discharge control device according to the present invention will be described as being applied to a power storage power conditioner.

  FIG. 1 is a block diagram illustrating an example of a configuration of a charge / discharge system including the power storage power conditioner 120 according to the first embodiment. The charge / discharge system of FIG. 1 includes a power conditioner unit 100 for power storage, a system controller 125, a distribution board 200, a general load 210, an important load 220, a solar power generation module 300, and a power for solar power generation. And a conditioner 350. The storage power conditioner unit 100 includes a storage battery 110, a DC / AC converter 121 including a system power sensor 121a, a charge / discharge control unit 122, a vibration sensor 123, a power system cutoff relay 124, and a battery management unit 130. And a battery cutoff relay 131.

  The power storage power conditioner 120 according to the first embodiment includes a DC / AC conversion unit 121 including a system power sensor 121a, a charge / discharge control unit 122, a vibration sensor 123, and a power system among the above-described components. An interruption relay 124 and a system controller 125 are provided. The power storage power conditioner 120 is not limited to the above-described configuration. For example, the power system disconnection relay 124 may be provided outside the power storage power conditioner 120, or the battery disconnection relay 131 may be used for power storage. By being provided inside the inverter 120, it may be provided.

  Each component of the power storage power conditioner 120 is comprehensively controlled by the charge / discharge control unit 122. The charge / discharge control unit 12 is realized as a function of the processor, for example, when a processor such as a CPU (Central Processing Unit) executes a program stored in a memory or the like. However, instead of the charge / discharge control unit 12 of the software, a signal processing circuit that realizes the same operation by a hardware electric circuit may be applied. As a concept combining the software charge / discharge control unit 12 and the hardware charge / discharge control unit 12, the word “processing circuit” may be used instead of the word “part”.

  The power storage power conditioner 120 (charge / discharge control unit 122) is configured to charge the storage battery 110 with electric power supplied from the power system via the distribution board 200, and load (general load) via the distribution board 200. 210 and the important load 220), it is possible to perform discharge control that permits discharge of the storage battery 110 in order to supply power.

  In the first embodiment, the storage battery 110 is described as a stationary storage battery. However, the present invention is not limited to this, and for example, a storage battery mounted on an electric vehicle may be applied. In the first embodiment, power storage power conditioner 120 is described as being installed in a house. However, the present invention is not limited to this, and may be installed in, for example, a facility or a store.

  When AC power from the power system (hereinafter also referred to as “system power”) is input to the DC / AC converter 121 via the distribution board 200 and the power line L2, the DC / AC converter 121 is The system power is converted into DC power in accordance with the control of the charge / discharge control unit 122. Similarly, when AC power from the photovoltaic power conditioner 350 is input to the DC / AC converter 121 via the power line L1, the distribution board 200, and the power line L4, the DC / AC converter 121 is The AC power is converted into DC power according to the control of the charge / discharge control unit 122. The DC power converted by the DC / AC converter 121 is stored in the storage battery 110 via the battery management unit 130.

  When the DC power stored in the storage battery 110 is input to the DC / AC converter 121, the DC / AC converter 121 converts the DC power into AC power according to the control of the charge / discharge controller 122. The AC power converted by the DC / AC converter 121 is appropriately supplied to the general load 210 and the important load 220 via the power line L3 and the distribution board 200.

  The system power sensor 121a (second sensor) of the DC / AC converter 121 detects the system power of the power system. For example, the system power sensor 121a detects the voltage, current, frequency, and the like of the power system. Similarly, the grid power sensor 121a detects voltage, current, frequency, and the like for the storage battery 110 as well.

  The vibration sensor 123 (first sensor) detects at least one action of vibration and impact.

  The charge / discharge control unit 122 determines whether a disaster has occurred based on the detection result of the vibration sensor 123. In the first embodiment, the disaster determined by the charge / discharge control unit 122 is an earthquake in the power storage power conditioner 120, but is not limited thereto.

  When the vibration acceleration G detected by the vibration sensor 123 is equal to or greater than the threshold vibration acceleration Gth set in the charge / discharge control unit 122, the power storage power conditioner 120 (charge / discharge control unit 122) It is determined that an earthquake has occurred at the location where the conditioner 120 is installed.

  When the vibration acceleration G detected by the vibration sensor 123 is equal to or less than the charge / discharge permission acceleration G0 set in the charge / discharge control unit 122, the power storage power conditioner 120 (charge / discharge control unit 122) It is determined that the earthquake has subsided at the location where the power conditioner 120 for power storage is installed. The charge / discharge permission acceleration G0 is set to a value smaller than the threshold vibration acceleration Gth, for example.

  When it is determined that an earthquake has occurred based on the detection result of the vibration sensor 123, the charge / discharge control unit 122 stops the charge control and the discharge control described above. When it is determined that the above-mentioned earthquake has been cured based on the detection result of the vibration sensor 123 after the charge control and the discharge control are stopped, and the system power detected by the system power sensor 121a is normal, the charge / discharge control unit 122 cancels the stop of the charge control described above. The control of the charge / discharge control unit 122 will be described in detail later using a flowchart.

  The electric power system interruption | blocking relay 124 (1st relay) is provided in the electric power line L2 which supplies electric power to the power conditioner 120 for electrical storage from an electric power system. When the power system disconnection relay 124 is disconnected, it is impossible to receive power between the power system and the power storage power conditioner 120. When the power system disconnection relay 124 is connected in parallel, the reception is not performed. It becomes possible.

  In the first embodiment, when it is determined that the above-described earthquake has occurred based on the detection result of the vibration sensor 123, the power system disconnection relay 124 is disconnected as quickly as possible. In the following description, the disconnection and parallel of the power system disconnection relay 124 are described as being controlled by the charge / discharge control unit 122, but the present invention is not limited to this.

  The system controller 125 is configured to be able to communicate the content of operation control and each sensor value with the charge / discharge control unit 122 by wire or wirelessly. The system controller 125 has an operation panel that receives an operation performed by the user, and transmits a signal corresponding to the received operation to the charge / discharge control unit 122. In addition, the system controller 125 includes a monitor 125 a that displays various information received from the charge / discharge control unit 122 (for example, operation status, remaining power of the storage battery, and charge / discharge power).

  Using the system controller 125 described above, the user can perform operation control switching operations while viewing various information displayed on the monitor 125a. In the first embodiment, the monitor 125a, which is a display unit, determines that an action (vibration and shock) is detected by the vibration sensor 123 when it is determined that an earthquake has occurred based on the detection result of the vibration sensor 123. The seismic intensity corresponding to at least one of them is displayed.

  The battery management unit 130 has a function of monitoring the voltage, current, temperature, and remaining power of the storage battery 110.

  The battery cutoff relay 131 (second relay) is provided on a power line that supplies power from the storage battery 110 to the important load 220 or the like via the power storage power conditioner 120. When the battery shut-off relay 131 is disconnected, it is impossible to receive power between the storage battery 110 and the power storage power conditioner 120. When the battery shut-off relay 131 is paralleled, the power can be received. Become.

  In the first embodiment, when it is determined that the above-described earthquake has occurred based on the detection result of the vibration sensor 123, the battery cutoff relay 131 is disconnected as quickly as possible. In the following description, the disconnection and parallel of the battery cutoff relay 131 are described as being controlled by the charge / discharge control unit 122, but the present invention is not limited to this.

  As the general load 210, for example, an electric device such as a rice cooker, a microwave oven, a dryer, a vacuum cleaner, or a washing machine is applied. For the important load 220, for example, electrical equipment such as lighting, a ventilation fan, an air conditioner, and a television is applied.

  The photovoltaic power generation module 300 is a household photovoltaic power generation device that converts light energy into electrical energy. The DC power generated by the photovoltaic power generation module 300 is supplied to the photovoltaic power conditioner 350. The power conditioner 350 for photovoltaic power generation converts the DC power from the photovoltaic power generation module 300 into AC power and outputs it to the distribution board 200 via the power line L1. Note that, instead of the solar power generation module 300 that generates power based on light energy, a power generation module that generates power based on wind power, geothermal power, tidal power, or the like may be applied. That is, a household power generation module that generates power based on natural energy may be used.

  In the charge / discharge system of FIG. 1 configured as described above, the power from the photovoltaic power conditioner 350 (power generated by the photovoltaic power generation module 300) is the total power consumption of the general load 210 and the important load 220. When more, the electric power from the power conditioner 350 for photovoltaic power generation is supplied to each load. Even if such power supply is performed, if there is still surplus power from the photovoltaic power conditioner 350, the surplus power is stored in the power storage power conditioner via the distribution board 200 and the power line L4. The battery 120 is supplied to the storage battery 110 and charged.

  On the other hand, when the power from the photovoltaic power conditioner 350 is less than the total power consumption of the general load 210 and the important load 220, the power of the storage battery 110 is stored in the power conditioner 120 for power storage in a form that compensates for the insufficient power. The power is supplied to the general load 210 and the important load 220 through the distribution board 200 and the power line L3. However, when the power is still insufficient (for example, when there is no remaining power in the storage battery 110), the system power of the power system is supplied to the general load 210 and the important load 220 in a form that compensates for the insufficient power.

  As charging control of the power storage power conditioner 120, there are control for charging the storage battery 110 with power from the power conditioner 350 for photovoltaic power generation and control for charging the storage battery 110 with system power from the power system. . With these charge controls, for example, using a contract that provides a cheaper electricity charge at midnight provided by an electric power company, the grid power is charged into the storage battery 110 at night, and a power conditioner 350 for photovoltaic power generation is used during the day. Surplus power from the battery 110 is charged into the storage battery 110.

  As the discharge control of the power storage power conditioner 120, as described above, the power supplied from the solar power generation power conditioner 350 to the general load 210 and the important load 220 is supplemented. The load 210 and the important load 220 are supplied.

  According to the power storage power conditioner 120 that performs the charge control and the discharge control as described above, it is possible to operate so as not to use the grid power from the power grid as much as possible, and to reduce the electricity bill as much as possible.

  However, when the photovoltaic power generation is reduced due to weather such as cloudy or rainy, the discharge control of the power storage power conditioner 120 is relatively increased, and the power supply from the power storage power conditioner 120 to the load is increased. As a result, the remaining power of the storage battery 110 decreases. In such a state, when a disaster such as a sudden earthquake that the user or the power storage power conditioner unit 100 cannot predict can occur, the charge control is performed as quickly as possible while preventing a secondary disaster in preparation for a subsequent power failure. It is hoped that it will be done. The power storage power conditioner 120 according to the first embodiment can perform such appropriate charge control as described below.

<Operation>
FIG. 2 is a flowchart showing an example of charge / discharge power control at the time of the earthquake occurrence of the power storage power conditioner 120 according to the first embodiment.

  First, in step S <b> 1, the vibration sensor 123 detects the vibration acceleration G, and outputs the detected vibration acceleration G to the charge / discharge control unit 122.

  In step S2, charge / discharge control unit 122 compares vibration acceleration G detected in step S1 with a predetermined threshold vibration acceleration Gth. If the vibration acceleration G is greater than or equal to the threshold vibration acceleration Gth, the process proceeds to step S3. For example, when a sudden earthquake or the like that cannot be predicted by the user or the power storage power conditioner 120 occurs, it is assumed that the vibration acceleration G becomes equal to or greater than the threshold vibration acceleration Gth and the process proceeds to step S3. When the vibration acceleration G is smaller than the threshold vibration acceleration Gth, the same charge / discharge control as before the occurrence of the disaster is performed without changing the control, and the operation of FIG.

  When the process proceeds from step S2 to step S3, the charge / discharge control unit 122 stops charging control for charging the storage battery 110 with the power supplied from the power system, and discharges the storage battery 110 to supply power to the load. Discharge control to allow

  Then, in step S4, the power system disconnection relay 124 and the battery disconnection relay 131 are disconnected. As a result, the power storage power conditioner 120 is disconnected from the outside and becomes an independent state. Therefore, the power storage power conditioner unit 100 collapses or a short circuit occurs in its internal circuit due to vibration or shock caused by an earthquake or the like. Even if it happens, the occurrence of ignition or electric shock can be suppressed.

  In step S <b> 5, the vibration sensor 123 detects the vibration acceleration G and outputs the detected vibration acceleration G to the charge / discharge control unit 122 as in step S <b> 1.

  In step S6, charge / discharge control unit 122 compares vibration acceleration G detected in step S5 with predetermined charge / discharge permission acceleration G0. If the vibration acceleration G is equal to or lower than the charge / discharge permission acceleration G0, the process proceeds to step S7. If the vibration acceleration G is greater than the charge / discharge permission acceleration G0, the process returns to step S5.

  In step S7, system power sensor 121a detects the system power of the power system, and charge / discharge control unit 122 determines whether or not the system power detected by system power sensor 121a is normal. For example, the charge / discharge control unit 122 confirms whether or not the system power, and thus the power system, is normal based on the voltage, current, frequency, and the like of the power system detected as the system power. When it is determined that the system power (power system) is normal, the process proceeds to step S8, and when it is determined that the system power (power system) is abnormal, the process proceeds to step S11.

  If it is determined in step S7 that the grid power is normal, the disaster mode is performed in step S8. Here, in step S8, the power system cutoff relay 124 and the battery cutoff relay 131 are arranged in parallel. Thereafter, the charge / discharge control unit 122 cancels the stop of the charge control performed in step S3, and shifts to the execution of the charge control. Thereby, the system power from the power system is charged to the storage battery 110 via the distribution board 200, the power line L2, and the power conditioner 120 for power storage.

  In step S8, as shown in FIG. 3, the monitor 125a displays the seismic intensity corresponding to the transition to the disaster mode and the action detected by the vibration sensor 123. However, when the storage battery 110 is already fully charged (charged to the maximum) when shifting to the charge control in step S8, or when the storage battery 110 is fully charged due to charging in step S8. In addition, the charge / discharge control unit 122 stops not only the discharge control but also the charge control, and as shown in FIG. 4, the monitor 125a displays that the charging is completed and the above-described seismic intensity.

  In step S9, the charge / discharge control unit 122 determines whether or not the system controller 125 shown in FIG. 4 has accepted an operation on the release button 125b. When it determines with having received, it progresses to step S10, and when that is not right, step S9 is performed again.

  In step S10, the charge / discharge control unit 122 cancels the disaster mode, performs the same charge / discharge control as before the occurrence of the disaster, and ends the operation of FIG.

  If it is determined in step S7 that the power system is abnormal, in step S11, the battery cutoff relay 131 is paralleled while the power grid cutoff relay 124 is disconnected. Thereafter, the charge / discharge control unit 122 shifts to the implementation of the independent operation control. In this self-sustained operation control, the charge / discharge control unit 122 performs another charge control for storing the power from the photovoltaic power conditioner 350 in the storage battery 110 instead of the charge control performed in step S3.

  In the self-sustained operation control according to the first embodiment, power is supplied to the important load 220 without supplying power to the general load 210. For example, when the output power from the photovoltaic power conditioner 350 is larger than the total power consumption of the important load 220, the output power is supplied to the important load 220, and the surplus power is supplied to the power line L4 and the power storage power conditioner 120. The storage battery 110 is charged via the above. When the output power from the photovoltaic power conditioner 350 is smaller than the total power consumption of the important load 220, the insufficient power is supplied to the important load 220 via the power line L3, the power storage power conditioner 120, and the like. . Thereafter, the operation of FIG. Note that the autonomous operation control in step S11 may be canceled manually or automatically when the power system becomes normal.

<Summary of Embodiment 1>
According to the power conditioner 120 for power storage according to the first embodiment as described above, after a disaster with vibration or impact occurs, for example, if the disaster is cured and the power system is normal, charging control is immediately performed. It can transition to. Therefore, when the above-described disaster occurs, the charging control can be performed as quickly as possible while preventing the secondary disaster.

  Further, according to the first embodiment, when it is determined that a disaster has occurred, the power system disconnection relay 124 and the battery disconnection relay 131 are disconnected. As a result, even if the power conditioner unit 100 for power storage fails due to vibration or shock due to a disaster, the power system disconnection relay 124 and the battery disconnection relay 131 are disconnected, so that secondary disasters such as ignition and electric shock Occurrence can be suppressed.

  Further, according to the first embodiment, when it is determined that an earthquake has occurred, the seismic intensity corresponding to the action detected by the vibration sensor 123 is displayed on the monitor 125a. As a result, the user can quickly know the magnitude of the earthquake and can accurately determine the disaster evacuation.

  Moreover, according to this Embodiment 1, instead of performing the charge control which makes the storage battery 110 charge the electric power from an electric power system, another charge control which makes the storage battery 110 charge the electric power from a household power generation module is performed. Is possible. Therefore, the possibility that the storage battery 110 is charged can be increased.

  The vibration sensor 123 does not necessarily have to be installed inside the power storage power conditioner 120. For example, as long as the charge / discharge control unit 122 can determine that a disaster has occurred based on the detection result of the vibration sensor 123, the vibration sensor 123 may be installed at an arbitrary location.

  Moreover, the charge / discharge control apparatus according to the present invention can be realized by any system that can charge the storage battery 110 from the power system, in addition to the apparatus according to the first embodiment. Does not limit the scope of the invention.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  110 storage battery, 120 power conditioner for power storage, 121a system power sensor, 122 charge / discharge control unit, 123 vibration sensor, 124 power system disconnect relay, 125a monitor, 131 battery disconnect relay, 210 general load, 220 critical load, 300 sunlight Power generation module.

Claims (6)

A charge / discharge control device that performs charge control for charging power supplied from an electric power system to a storage battery and discharge control that permits discharge of the storage battery to supply power to a load,
A first sensor that detects at least one of vibration and shock;
A second sensor for detecting system power of the power system;
When it is determined that a disaster has occurred based on the detection result of the first sensor, the charge control and the discharge control are stopped, and after the stop, the disaster has been cured based on the detection result of the first sensor. A charge / discharge control apparatus comprising: a control unit that cancels the stop of the charge control when the system power determined and detected by the second sensor is normal. The charge / discharge control apparatus according to claim 1,
When it is determined that the disaster has occurred based on the detection result of the first sensor, a first relay provided on a power line that supplies power from the power system to the charge / discharge control device is disconnected, The charging / discharging control apparatus by which the 2nd relay provided in the power line which supplies electric power to the said load via the said charging / discharging control apparatus from the said storage battery is disconnected. The charge / discharge control apparatus according to claim 2,
After the first and second relays are disconnected, it is determined that the disaster has been cured based on the detection result of the first sensor, and the grid power detected by the second sensor is normal A charge / discharge control device in which the first and second relays are arranged in parallel. The charge / discharge control device according to any one of claims 1 to 3,
The disaster includes an earthquake in the charge / discharge control device,
A charge / discharge control apparatus further comprising a display unit that displays a seismic intensity corresponding to the action detected by the first sensor when it is determined that an earthquake has occurred based on a detection result of the first sensor. The charge / discharge control apparatus according to any one of claims 1 to 4,
The controller is
After stopping the charge control and the discharge control, it is determined that the disaster has been cured based on the detection result of the first sensor, and the grid power detected by the second sensor is abnormal, Instead of performing the charge control, a charge / discharge control device that performs another charge control for charging the storage battery with power from a household power generation module that generates power based on natural energy. A charge / discharge control method for performing charge control for charging power supplied from an electric power system to a storage battery, and discharge control for permitting discharge of the storage battery to supply power to a load,
(A) a step of stopping the charge control and the discharge control when it is determined that a disaster has occurred based on a detection result of at least one of vibration and impact;
(B) After the step (a), when it is determined that the disaster has been cured based on the detection result of the action, a step of detecting system power of the power system;
(C) When the system power detected in the step (b) is normal, a charge / discharge control method comprising: releasing the stop of the charge control.

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