JP2008141926A - Home power storage device, on-vehicle power storage device, power supply/storage system and power storage control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a power supplier to efficiently and rapidly react when a power supply frequency or a voltage must be adjusted. <P>SOLUTION: This device is applied to an apparatus provided with a home power storage means charged with a commercial AC power supply from an electric power supplier or a self-power generator, and discharging power to a domestic load or an external load. A control means of the domestic power storage means ensures the capacity predetermined within a power storage capacity of the power storage means as a capacity chargeable and dischargeable based on a command from the electric power supplier. Under the above conditions, the electric power supplier detects the frequency of the commercial AC power supply, and transmits a charging command or a discharging command to homes each provided with a domestic power storage means when the detected power supply frequency must be adjusted. Upon receiving the charging command or discharging command, each home modifies the discharging current or charging current of the power storage means within the predetermined capacity of the power storage capacity of the power storage means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a home power storage device and an in-vehicle power storage device installed in a house such as a general home, a power supply / storage system having the power storage device, and a power storage control method applied to the system.

The demand for energy conservation is increasing due to social issues such as environmental problems and soaring oil prices.
Accordingly, attention has been focused on a home battery system that uses inexpensive late-night power (see, for example, Patent Document 1).
The home battery system has a large number of secondary batteries built in and is charged with inexpensive late-night power. And the form which uses the electric power charged by the secondary battery for the daytime is assumed. Alternatively, there is a mode in which a solar cell is connected, and the power obtained by the solar cell in the daytime is charged in the secondary battery and discharged at night.

On the other hand, as a battery system installed at home, there is a secondary battery for automobiles (vehicles). Automobiles that require secondary batteries include electric vehicles that use a motor as a drive source or hybrid vehicles that are used in combination with an engine. In any case, in-vehicle secondary batteries can be charged at home. It is preferable to consider the cost and usability required for charging. As a system for charging an in-vehicle secondary battery at home, for example, a corresponding automobile is provided with a charging terminal, and the charging terminal is connected to an outlet from which a commercial AC power source for household use can be obtained, and a power cord. And connected with a commercial AC power source for home use. It is assumed that the secondary battery for automobiles is generally charged with inexpensive midnight power.
JP 2002-281893 A

  By the way, an electric power company that is an electric power supplier is required to stably supply commercial AC power. Specifically, the stable supply means that the voltage of the commercial power supply is stabilized to a specified voltage such as AC100V or AC200V, and the AC frequency of the commercial power supply is stabilized to 50 Hz or 60 Hz. Both power supply voltage fluctuations and AC frequency fluctuations are caused by load fluctuations, and the frequency is stabilized if power corresponding to the load capacity can be supplied. In general, electric power companies predict the load capacity for each time slot, generate base power according to the expected load capacity, and adjust the single and short fluctuations in supply and demand to stabilize the frequency. It is designed to generate electricity with a certain margin.

  However, when there is a load fluctuation that exceeds the expectations of the electric power company, or when the power supply capability decreases due to some trouble, it is impossible to quickly deal with it. As an extreme example, for example, when there is a lightning strike at a certain substation, power supply frequency corresponding to the load capacity cannot be supplied, the power frequency decreases.

  When the power supply to the load capacity is excessive or insufficient, the power company will send a command to reduce or increase the generated power to the power plant, but change the generated power of the nuclear power plant quickly. Is virtually impossible. For thermal power plants, although it takes a long time to start up, it is possible to change the supplied power quickly if it is up to about a few percent of the rated capacity after starting up. Gets worse. The conventional pumped-storage power plant can be started up relatively quickly, and the power generation operation is satisfactory for the response performance and change range of the generated power, but it is difficult to adjust the load power during pumping operation. hard. The variable speed pumped storage power plant can quickly change the power for both power generation and pumping operations, but the number of units that can be installed is limited. When the total installed capacity of power storage means with secondary batteries and capacitors in general households becomes larger, it is more reasonable for an electric power company to adjust the supply and demand of power using these power storage means It is self-explanatory.

  The present invention has been made in view of such a point, and an object thereof is to enable effective and quick handling when a power supply company needs to adjust a power supply frequency and a voltage.

The present invention is applied to a power storage unit that is charged with a commercial AC power supply or a private power generation unit from a power supply company, and that has a household power storage unit that discharges to a house load or an external load, or a vehicle power storage unit.
In the control means of the household power storage means installed in the home, a predetermined capacity among the power storage capacities of the power storage means is secured as a capacity that can be discharged and charged by a command from the power supplier.
In addition, the power supply company detects the frequency of the commercial AC power supply, and when adjustment of the detected power supply frequency is necessary, issues a charge command or discharge command to the house equipped with household power storage means. In each home, when the discharge command or the charge command is received, the charge current or discharge current of the power storage means is changed within a predetermined capacity range of the power storage capacity of the power storage means. .

According to the present invention, it is possible to control charging and discharging at the power storage means installed in each household or vehicle by a command from the power supplier, so that when viewed from the power supplier, each household has a load fluctuation. The state is equivalent to the installation of the absorbing means.
For example, if the power supply from the power supplier is too small and the frequency is low, send a command to increase the discharge current to the power storage means in each household, so that at least the command In households where is added, the consumption of electric power supplied from the electric power supplier is reduced. Conversely, if the amount of power supply from the power supplier is too high and the frequency becomes high, send a command to increase the charging current to the power storage means in each household, and at least the command In a home where charging power is added, the consumption of power supplied from the power supplier increases.
Even if the amount of power consumption that can be adjusted in each home is relatively small, by sending a command to all the homes equipped with power storage means at the same time, the AC frequency can be determined from the viewpoint of the power supplier. Adjustable enough to stabilize. In addition, since adjustment is performed at each home, adjustment is performed at a position closest to the load where power is consumed, and preferable adjustment can be performed.
The capacity that can be discharged and charged by a command from such a power supply company is limited to a predetermined capacity among the storage capacities of the power storage means, so that the power storage means in each home As a result, a sufficient capacity for charging and discharging can be secured, and it is possible to prevent the storage means from being used in each home.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram for explaining an actual use situation of a home battery system 107 as an example of the present embodiment.
AC 101V commercial AC power 102 for general households is drawn into the house 101 from an electric power company.
A breaker (MCCB: Molded-Case Circuit Breaker) 104 is provided on the switchboard 103. Various electric appliances are installed in the house 101 and consume electric power. When using this appliance, it becomes a load that consumes power. The electric appliances in the house 101 are supplied with electric power through the breaker 104. The breaker 104 is a switch that limits the current value of power supplied from an electric power company to a current value contracted in advance, and cuts off when there is power consumption exceeding the current value.

  An electric water heater 105 is installed in the house 101 as one of electric appliances. The electric water heater 105 uses, for example, inexpensive midnight power to heat and store water with the electric heater 106 or the like, and uses the stored hot water when necessary. Further, in the example of FIG. 1, a microwave oven 109 and a lighting fixture 110 are illustrated as an example of an electrical appliance installed in the house 101.

  In this example, a home battery system 107 is installed in the house 101 (or outdoors adjacent to the house 101). The home system 107 has a large number of secondary batteries built therein and is normally charged with midnight power. The electric power charged in the secondary battery is used during the day. By using the home battery system 107 in this way, it becomes possible to keep the electricity rate of each home low. As the secondary battery, for example, a lithium ion secondary battery, a nickel hydride secondary battery, or the like is used.

  Further, the home battery system 107 has a charging control function for the automobile 108. Here, the automobile 108 is an automobile equipped with a large capacity secondary battery such as an electric vehicle or a hybrid vehicle. When the automobile 108 is connected, the home battery system 107 monitors the remaining charge of the secondary battery in the automobile 108 and controls charging and discharging. For charging the secondary battery in the automobile 108, basically, late-night power is preferentially used. However, as for the charging of the secondary battery of the automobile 108, charging is started even in the daytime without waiting for the late-night power time period according to the necessity of charging. In some cases, the secondary battery in the home battery system 107 is discharged to charge the secondary battery in the automobile 108.

FIG. 2 is a block diagram of a home battery system 107 as an example of the present embodiment.
AC 200 V commercial power 102 is supplied to the house 101 through the breaker 104.
The commercial power 102 is connected to a load 202 including an electric water heater 105 and a lighting 110 and is also supplied to a home battery system 107. Although not shown in the figure, 200 VAC is converted to 100 VAC if necessary.
The home battery system 107 converts the input AC 200 V voltage into DC 350 V by the AC / DC converter 203. For this reason, the DC 350V output line 204 of the AC / DC converter 203 is connected to a DC / DC chopper 207 and a DC / AC converter 209 described later.

  The control device 205 in the home battery system 107 detects the received current from the power company through the non-contact type received current detector 206 provided immediately before or after the breaker 104. Also, the AC / DC converter 203, a DC / DC chopper 207, which will be described later, and a DC / AC converter 209 are controlled.

  The DC / DC chopper 207 is provided between the household battery 208 and the DC 350V output line 204 of the AC / DC converter 203. The DC / DC chopper 207 executes charging / discharging of the home battery 208 under the control of the control device 205. For example, when a lithium ion secondary battery is used as the home battery 208, the cell voltage fluctuates relatively greatly depending on the remaining charge, so the output line of the DC / DC chopper 207 corresponds to, for example, about DC300V to 180V. Fluctuate between.

  The DC / AC converter 209 is provided between the connector 211 with the in-vehicle battery system 210 and the DC 350V output line 204 of the AC / DC converter 203. The DC / AC converter 209 performs conversion from DC 350 V to AC 200 V under the control of the control device 205. Note that the DC / AC converter 209 also has a function of receiving power supplied from the in-vehicle battery system 210 side and supplying power to the DC 350V output line 204, as with the DC / DC chopper 207 described above.

  The in-vehicle battery system 210 includes an AC / DC converter 216, and converts AC 200V into the voltage of the in-vehicle battery 217. As a voltage of the vehicle-mounted battery 217, it is DC300-180V, for example. The control device 218 performs charge / discharge control of the AC / DC converter 216. The in-vehicle battery system 210 includes a power line modem 226, and the control device 218 performs bidirectional data transmission with the control device 205 on the home battery system 107 side. For this reason, a power line modem 225 is also provided between the DC / AC converter 209 and the connector 211 on the home battery system 107 side.

  Further, in the home battery system 107 of this example, the power line modem 227 is also connected to the supply line of the commercial AC power 102 from the power company side, and the control device 205 of the home battery system 107 is bidirectional with the power company side. Are configured to perform communication.

  The control device 205 of the home battery system 107 determines the remaining charge amount of the home battery 208, the current time, the received current detected by the received current detector 206, and the like to charge the home battery 208 and the home battery 208. To discharge the load 202 to the load 202. The control device 205 of the home battery system 107 also determines charging of the in-vehicle battery 217 from the remaining charge of the in-vehicle battery 217 and the like. Depending on the case, the vehicle battery 217 can be discharged and the household battery 208 can be charged with the discharge current, or the load 202 can be driven with the discharge current.

  Here, in the present embodiment, when a special contract with the electric power company is made in advance, a part of the charging capacity determined in advance among the charging capacity of the home battery 208 is set by the electric power company on the frequency and voltage. It can be used for adjustment. Specifically, for example, as shown in FIG. 4, the control device 205 of the home battery system 107 is used as a user frame up to a certain amount of remaining charge between the upper limit value and the lower limit value of the charge amount of the home battery 208. However, in order to optimize the unit price of electric power, a range that can be freely used for charging and discharging is set. Then, the remaining charge remaining up to the upper limit value can be used for adjustment of the power supply frequency as a power company frame under the control of the power company.

  The ratio between the capacity of the user frame and the capacity of the power company frame is set by a contract with the power company. For example, 10% of the upper limit charging capacity is set as a power company frame. Depending on the contract, 20% of the upper limit charging capacity is set as a power company frame. It is preferable to variably set contract charges such as power charges and basic charges according to the setting ratio of the power company frame. Alternatively, the electric power company may pay a part of the purchase funds of the system when installing the home battery system 107 according to the set ratio.

Similarly, as shown in FIG. 4, the in-vehicle battery 217 can be freely charged as a user frame up to a certain amount of remaining charge between the upper limit value and the lower limit value of the charge amount of the in-vehicle battery 217. The remaining charge remaining up to the upper limit is set to a range that can be used for discharging, and can be used for adjusting the power supply frequency as a power company frame under the control of the power company. However, the electric power company frame is set for the in-vehicle battery 217 only when it is connected to the home battery system 107, and charging and discharging are performed without considering the electric power company frame when the automobile 108 is running. In the case of the in-vehicle battery 217, as shown in FIG. 4, the upper limit value has a surplus power that can be charged with regenerative power at the time of braking, and the lower limit value is a surplus power of the discharge power that is left for emergency movement of the vehicle. Determined by. In the case of the home battery 208, it is not necessary to consider such a thing for the setting of the upper limit value and the lower limit value, and the upper limit value and the lower limit value may be set from values allowed by the characteristics of the secondary battery.
The charging and discharging processes using the electric power company frame set in this way will be described later with reference to the flowcharts of FIGS.

  Next, an example of a control device on the electric power company side according to the example of the present embodiment will be described with reference to FIG. As described with reference to FIG. 2, the home battery system of each home includes a power line modem 227 for communication with the power company side, and various data is transmitted between each home and the power company. Through this data transmission, the power company-side control device 300 obtains data on the current power [W], the remaining power [W], and the remaining power amount [Wh] of the home battery 208 from the home battery system 107 of each home. When the automobile 108 is connected to each home, data on the current power [W], the remaining power [W], and the remaining power [Wh] of the in-vehicle battery 217 of the automobile is also obtained. The data such as the remaining power is individual data in each household, and the current power [MW], the remaining power [MW], and the remaining power amount [MWh] as the total values obtained by adding the values in the totalizer 301 are obtained. obtain. Here, the remaining power is the remaining power in the power company frame of the above-described home battery 208 and in-vehicle battery 217.

  A frequency increase command and a frequency decrease command are supplied from the power company-side control device 300 to the home battery system 107 of each home via a power line modem. The frequency increase command and the frequency decrease command may be collectively supplied to a household battery system in a certain area unit. Or you may supply separately according to conditions, such as a battery remaining charge of each household battery system 107. FIG. In the example of FIG. 3, the power company-side control device 300 is an example of performing communication with three homes 101a, 101b, and 101c.

The power company-side control device 300 sends the result of counting by the counting device 301 to the automatic frequency adjustment possible time determination unit 302, for example, current maintenance possible time [h] = remaining power amount [MWh] / current power [MW] 1)
Maximum adjustable time [h] = remaining power [MWh] / (current power + remaining power) [MW] (2)
Is calculated, and the adjustable time in the power storage means having a secondary battery or a capacitor installed in a general household is always determined. When it is determined that adjustment on the load side becomes difficult because the storage capacity as an electric power company frame is almost full, an instruction to start preparation for adjusting the generated power as in the past is sent. In accordance with the start-up time of each power plant, a start command (stop command) or the like is sent to a thermal power plant, a pumped-storage power plant, a hydro power plant, or the like in advance. Further, the remaining power [MW] tabulated by the tabulator 301 is supplied to the automatic frequency adjustment gain changing unit 303, and when the adjustment is performed by the automatic frequency adjusting unit 304, it is determined how much adjustment is possible. In addition, the automatic frequency adjustment unit 304 determines the frequency detection value and the frequency command value, and outputs a frequency increase command or a frequency decrease command when frequency adjustment is necessary. The frequency increase command and the frequency decrease command are issued to the control device 205 of the home battery system 107 in each home via a power line modem (not shown) in the power company control device 300. In addition, when the total value [MW] of the remaining power of the home battery system is insufficient for the power [MW] necessary for frequency adjustment, the shortage is covered by the output adjustment command of the power plant currently in operation as before.

Next, with reference to the flowchart of FIG. 5, an example of a power frequency adjustment process using a home battery, which is performed by the power company-side control device 300, will be described.
When the power supply frequency adjustment using the home battery is started in the electric power company side control device 300. The remaining power data of each household is received (step S11), and the received power values are tabulated (step S12). After that, the power supply frequency is monitored to determine whether or not the frequency is increasing (step S13). If it is determined that the frequency is higher than the reference value, a frequency lowering command is sent to the house where the home battery system is installed (step S14). Further, it is determined whether or not the frequency is lower than the reference value (step S15). If it is determined that the frequency is lowered, a frequency increase command is sent to the house where the home battery system is installed (step S16). Thereafter, the processing up to this point is repeated to stabilize the power supply frequency at the reference value.

Next, a processing example in the control device 205 of the home battery system will be described with reference to the flowchart of FIG.
The control device 205 of the home battery system calculates the remaining power of the power company frame of the home battery 207 (step S21), and transmits the calculated remaining power data to the power company control device 300 (step S22). The calculation and transmission of the remaining power may be performed according to a command from the power company apparatus 300.

  Thereafter, it is determined whether or not a frequency reduction command has been received (step S23). When the corresponding command is received, it is determined whether or not the current state of the home battery is being charged (step S24). Note that the charging here includes a state in which neither charging nor discharging is performed. If it is determined in step S24 that charging is in progress (or a state in which nothing is done), the current charging current to the home battery 207 is increased by one step (step S25). For example, when charging is currently being performed with a charging current of 30 A, the charging current is increased to 31 A. In the charge stop state, for example, the charging current is changed from 0A to 1A.

  If it is determined in step S24 that the battery is not being charged, it is determined whether or not the current state of the home battery is discharging (step S26). If it is determined that the battery is being discharged, the discharge current from the current home battery 207 to the load in the home is reduced by one step (step S27). For example, when discharging is currently performed at a discharge current of 10 A, the discharge current is reduced to 9 A.

  If the frequency lowering command is not received in step S23, it is determined whether or not the frequency increasing command is received (step S28). If the frequency raising command is received, it is determined whether or not the current state of the home battery is discharging (step S29). Note that the discharging here includes a state in which neither charging nor discharging is performed. If it is determined that the battery is being discharged, the discharge current from the current home battery 207 to the load in the home is increased by one step (step S30). For example, the discharge current is increased to 11 A when the discharge is currently being performed with a discharge current of 10 A. In the discharge stop state, for example, the discharge current is changed from 0A to the discharge current 1A.

  If it is determined in step S29 that the battery is not being discharged, it is determined whether the current state of the home battery is being charged (step S31). If it is determined in step S31 that charging is in progress, the current charging current to the home battery 207 is reduced by one step (step S32). For example, when charging is currently being performed with a charging current of 30 A, the charging current is reduced to 29 A.

  If the process so far is performed, it will return to the calculation process of the remaining electric power of step S21. For example, when there is a frequency reduction command and the remaining power is calculated and charged until the power company frame is full, the increase in charging current due to the command from the power company is Process to return to. Conversely, when there is a frequency increase command and the remaining power is calculated until the power company is exhausted, the increase in discharge current due to the command from the power company is restored. I do.

FIG. 7 is a diagram showing an example of adjustment of the power supply frequency by charge / discharge control of the home battery when charging and discharging are controlled as described above.
Fig.7 (a) is the figure which showed the charging current value of a household battery. In this example, 40A is set as the maximum charging current of the home battery, 30A out of 40A is used for charging the user frame, and the remaining 10A is used for charging the power company frame. There is an example.
FIG. 7B shows the power supply frequency of the AC power supply supplied from the power company. In this example, 60 Hz is set as a reference frequency.
FIG. 7C shows a charge command and a discharge command transmitted from the power company side to the home battery system.

  The processing example shown in FIG. 7 will be described. First, paying attention to FIG. 7A, in this home battery system, at 21:00 at night, charging is performed at 30A which is the maximum current value set in the user frame. Suppose that the battery is charged until 6 am in the morning. The current Ia is a change in the charging current at this time. On the other hand, it is assumed that the power supply frequency is slightly higher around 21:00 as shown in FIG. This phenomenon in which the power supply frequency increases is caused by a decrease in load capacity. In the example of FIG. 7B, the frequency is increased from 60 Hz to 60.5 Hz.

  When such a fluctuation in power supply frequency is detected by an electric power company, as shown in FIG. 7C, a frequency lowering command (charging) is performed from the electric power company's control device to each home battery system control device. Up command) C1 is sent. In the home battery system that has received this command C1, as shown in FIG. 7A, the charging current is increased by 1A. In the example of FIG. 7, it is assumed that, after that, the control device on the electric power company side determines that further load adjustment is necessary, and the frequency reduction commands C2, C3, and C4 are transmitted. Each time this command is received, the control device of the home battery system increases the charging current by 1A. However, it is an increase within the range of 10A prepared as a power company frame. Although not shown in FIG. 7, the charging is performed within the charging capacity (remaining amount) prepared as a power company frame in terms of the charging capacity.

  In this way, the control to increase the charging current of the home battery system installed in each home in a specific area is performed, and as a result, the load capacity in that area increases, and FIG. ), The power supply frequency is lowered.

  In the example of FIG. 7, the load capacity is increased thereafter, and the power supply frequency is reduced from 60 Hz to 59.5 Hz. When this decrease in power supply frequency is detected by the electric power company, as shown in FIG. 7 (c), the electric power company's control device sends a frequency increase command (charge lowering command) to the control device of each home battery system. ) Send C5. In the home battery system that receives this command C5, the charging current is decreased by 1 A as shown in FIG. In the example of FIG. 7, it is assumed that, after that, the control device on the power company side determines that further load adjustment is necessary, and the frequency reduction commands C6, C7, and C8 are transmitted. Every time this command is received, the control device of the home battery system decreases the charging current by 1A.

  By reducing the load capacity in this way, the power supply frequency can be increased as shown in FIG. 7C, and the reference frequency can be brought close to 60 Hz.

  Note that the charging current Ia shown in FIG. 7A is an example in which charging using the user frame is performed at a constant rate of 30 A from 21:00 to 6 o'clock. May change. For example, even when the charging current for the charging using the user frame is reduced from 30A to 15A at 23:00 as in the charging current Ib indicated by the broken line in FIG. The increment is in a state of being added as it is.

  By controlling the charging and discharging of the household battery from the power company side in this way, when the power supplied from the power company is unstable due to load fluctuations, etc., it acts to stabilize, The power supply frequency can be controlled to be constant. The amount of charge and discharge using this home battery is limited, but the power company controls the start and stop of the power plant, and if it starts, the home battery is used. Since charging and discharging are unnecessary, combining them makes it possible to cope with a relatively sudden load fluctuation.

  In the description so far, it has been described that charging and discharging according to a command from an electric power company is performed on a household battery in the household battery system. However, in the system of this example as shown in FIGS. The on-vehicle battery is also connected, and charging and discharging of the on-vehicle battery may be similarly controlled.

  The flowchart of FIG. 8 shows an example of control by the control device 205 of the home battery system in that case. First, the remaining battery level is determined (step S41), and the remaining battery level is determined (step S42). After determining the two remaining battery levels, it is determined whether a frequency increase command or a frequency decrease command has been received (step S43). When the corresponding command is received, it is determined which battery needs to be charged / discharged based on the determination of two remaining battery levels and charging current (step S44). For example, it is possible to control which battery (or both batteries) by comprehensively judging whether it is possible to increase the charging current to the home battery or to increase the charging current to the in-vehicle battery. Judge whether it is good to do. In this determination process, it is determined whether or not the control state of the in-vehicle battery needs to be changed (step S45), and when it is determined that it is necessary to control charging (discharge) of the in-vehicle battery, The control device 218 (FIG. 2) transmits the corresponding frequency increase command and frequency decrease command, and causes the control device 218 side of the in-vehicle battery control system to execute control corresponding to the in-vehicle battery (step S46).

In this way, the charge and discharge of the in-vehicle battery can also be controlled from the electric power company side, so that the power capacity that can be adjusted is increased, which is preferable.
In addition, it is good also as a system structure which performs charge and discharge only for vehicle-mounted battery by the command from the electric power company side. In the example of the flowchart of FIG. 8, as control of charging and discharging of the in-vehicle battery, after receiving a command from the electric power company by the control device in the home battery system, the control device in the home battery system receives the command from the vehicle side. The control device in the vehicle configured to send a command to the control device for control may be configured to directly receive the frequency increase command or the frequency decrease command for the in-vehicle battery from the power company side.

  Further, in the above-described embodiment, a secondary battery such as a lithium ion battery is used as a battery included in the home battery system. Other power storage means may be used. For example, a power storage means such as a large capacity capacitor may be used. A system configuration in which a secondary battery and a large-capacity capacitor are used together may be used.

  In addition, in the house 101 having the configuration shown in FIGS. 1 and 2, only the home battery system and the appliance corresponding to the load are installed. For example, the house 101 has power generation means such as a solar battery and a wind power generator. When the power generated by the power generation means is configured to charge the home battery 208 in the home battery system 107, the charging current and discharging current of the home battery are controlled by a command from the power supplier. It may be.

  In the above-described embodiment, the home battery system and the in-vehicle battery system are used in combination. However, the home battery system alone may be used. Alternatively, it is configured as a vehicle charging / discharging device provided with a large-capacity secondary battery, and is configured not to include a home battery, but to perform similar processing only by controlling charging and discharging of the secondary battery on the vehicle side. It is good.

  In addition, regarding the communication between the power supply provider side and the home battery system side, the power line communication is configured in the above-described embodiment, but other communication means such as a telephone line and the Internet may be used. . For example, a configuration may be adopted in which communication is performed with a computer device in the home via a wireless LAN or a wired LAN, and communication with the power supply provider side is performed using an access function to the Internet provided in the computer device.

  Further, in the above-described embodiment, when discharging from the battery provided in the home battery system or the in-vehicle battery system, the discharge power from the battery is supplied to the load in the house 101 shown in FIG. However, the configuration may be such that the discharge power from the battery is returned to the power supply line from the power company and supplied to other households in the vicinity.

It is the schematic for supposing and explaining the actual utilization condition of the household battery system which is an example of this Embodiment. It is a block diagram of a household battery system which is an example of the present embodiment. It is a block diagram of the system configuration seen from the electric power company of the example of the present embodiment. It is explanatory drawing which shows the example of allocation of the battery charge amount by this Embodiment. It is a flowchart which shows the example of control by the electric power company side by this Embodiment. It is a flowchart which shows the example of control by the home side by this Embodiment. It is explanatory drawing which shows the example of the charging / discharging state by this Embodiment. It is a flowchart which shows the example of control of the vehicle-mounted battery by this Embodiment.

Explanation of symbols

  101, 101a, 101b, 101c ... house, 102 ... commercial power, 103 ... distribution panel, 104 ... breaker, 105 ... electric water heater, 106 ... electric heater, 107 ... home battery system, 108 ... automobile, 109 ... microwave oven, 110 ... Lighting equipment, 202 ... Load, 203 ... AC / DC converter, 204 ... DC 350V output line, 205 ... Control device, 206 ... Non-contact type received current detector, 207 ... DC / DC chopper, 208 ... Home battery, 209 ... DC / AC converter, 210 ... vehicle battery system, 211 ... connector, 216 ... AC / DC converter, 217 ... vehicle battery, 218 ... control device, 225, 226, 227 ... power line modem, 300 ... power company side control device, 301 ... Aggregator 302 ... Automatic frequency adjustment possible time determination unit 303 ... Automatic frequency adjustment gain Down changing unit, 304 ... automatic frequency adjusting unit

Claims (8)

Power storage means that is charged by a commercial AC power source or private power generation means supplied from an electric power supplier and discharged to a house load or an external load;
Control means for controlling charging and discharging in the power storage means;
Communication means for receiving a command from the power supplier,
The control means secures a predetermined capacity among the storage capacities of the power storage means as a capacity that can be discharged and charged by a command from the power supplier, and from the power supplier A household power storage device that changes a charging current or a discharging current of the power storage unit within a range of the secured capacity when a charging command or a discharging command is received via a communication unit.   2. The household power storage device according to claim 1, wherein the power storage unit is a power storage unit that is installed in a vehicle to obtain power for driving the vehicle.   2. The household power storage device according to claim 1, wherein the capacity that can be discharged and charged in accordance with a command from the power supplier is a fixed capacity set by a contract with the power supplier.   2. The household power storage device according to claim 1, wherein the control unit notifies the power supplier of the remaining power amount of the power storage unit via the communication unit.   2. The household power storage device according to claim 1, wherein a capacity that can be discharged and charged in accordance with a command from the power supplier is variably set according to a remaining charge amount of the power storage means. Power storage means for obtaining power for driving the vehicle;
Control means for controlling charging and discharging by the commercial AC power source to the power storage means;
A communication means for receiving a command from a power supply company that supplies the commercial AC power supply or a command based on the command;
The control means secures a predetermined capacity among the storage capacities of the power storage means as a capacity that can be discharged and charged by a command from the power supplier, and from the power supplier An in-vehicle power storage device that changes a charging current or a discharging current of the power storage unit within a range of the secured capacity when a charging command or a discharging command is received via a communication unit. Power supply comprising a power supply company that supplies a commercial AC power supply, and a household power storage means that is charged by a commercial AC power supply or private power generation means from the power supply company and discharged to a house load or an external load. A storage system,
As the power supplier,
Frequency detection means for detecting the frequency of the commercial AC power supply;
When it is necessary to adjust the power supply frequency detected by the frequency detection means, the provider side communication means for sending a discharge command or a charge command to a house provided with the household power storage means,
As a house where the household electricity storage means is installed,
Control means for controlling charging and discharging in the household power storage means;
A house-side communication means for receiving a command from the power supplier,
The control means secures a predetermined capacity among the storage capacities of the household power storage means as a capacity that can be discharged and charged by a command from the power supplier, and When the house side communication means receives the charge command or discharge command transmitted from the means, the power supply is characterized in that the charge current or discharge current of the power storage means is changed within the secured capacity range.・ Storage system. In a power storage control method for performing charge / discharge control of household power storage means that is charged by a commercial AC power source or private power generation means from a power supply company and discharged to a house load or an external load,
When the frequency of the commercial AC power supply is detected by the power supplier and adjustment of the detected power supply frequency is necessary, a discharge command or a charge command is sent to the house provided with the household power storage means,
The power storage control characterized in that, in a house that has received the discharge command or the charge command, the charge current or the discharge current of the power storage means is changed within a predetermined capacity range of the power storage capacity of the power storage means. Method.

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