JP2021180581A - Soc controller for power storage device - Google Patents

Abstract

To provide, in a power distribution network for distributing electric power to a plurality of users, a configuration that controls the SOC of a power storage device to store the electric power in the power storage device so as to supply more electric power to the power distribution network that is connected to the power storage device and is expected to deal with the increased demand for electric power as an event or the like progresses.SOLUTION: The present invention relates to an SOC controller for controlling the SOC of a power storage device in a power distribution network to which a user apparatus, a power generator, and a power storage device are connected. The SOC controller includes: event prediction information acquisition means for acquiring prediction information on an event occurrence that can cause increase of demand for electric power by the user apparatus; and SOC control means for controlling the SOC when the prediction information is received, so that the power storage device can discharge electric power for supplying, through the power distribution network, the amount of electric power that is expected to be used by the user apparatus when an event in the prediction information happens.SELECTED DRAWING: Figure 1

Description

The present invention relates to a control device for SOC (State of charge) of a power storage device, and more specifically, a power distribution network or a power distribution system that distributes and supplies power to a plurality of users (consumers). Related to the device that controls the SOC of the power storage device connected to the distribution network in order to stabilize the power supply.

In a distribution network that distributes electric power from a power source such as a power plant or a power generation device to multiple users, it is necessary that the supply amount and the demand amount of electric power match as a whole. In recent years, the distribution network In the case of naturally variable power generation such as solar power generation, wind power generation, or tidal power generation introduced in, it is difficult to adjust the power supply amount in response to fluctuations in power demand, so storage batteries are installed in the distribution network. A configuration is adopted in which a power storage device including the above is connected to stably follow the power supply amount with respect to the power demand amount, and various improvements related to such a power storage device have been proposed. For example, in Patent Document 1, in an energy system having a plurality of storage batteries and a regenerative power source, the SOC of the storage battery is appropriately set in advance when the storage battery is charged for the purpose of suppressing deterioration of the storage battery. The state of charge for the storage battery is maintained until the upper limit of the SOC is reached, and when the storage battery is discharged, the state of charge of the storage battery is maintained until the SOC of the storage battery reaches the lower limit of the SOC appropriately set in advance. It has been proposed to individually control the charging and discharging of the storage battery. In Patent Document 2, in a configuration in which a small-scale system in which a renewable energy power generation device, a storage battery, and a load that consumes electric power are interconnected is installed downstream of the distribution network (lower system), the inside of the small-scale system is installed. The capacity of the storage battery is made smaller so that the cost can be suppressed, while the power transmission / reception power between the small-scale system and the upstream (upper system) of the distribution network is kept low, which may adversely affect the upper system. A method of planning the operation of a storage battery has been proposed so that the reverse power flow (backflow of electric power) from the system to the upper system can be reduced as much as possible. Patent Document 3 describes, in a power storage device connected to a power transmission / distribution network together with a load and a power source, to secure a balance between supply and demand of power of the network every moment to stabilize the system frequency of the network, or to stabilize the system frequency of the network. The charge / discharge target SOC and charge / discharge current rate are controlled so that the charge / discharge to secure the balance between the supply and demand of electric power and stabilize the supply and demand in the power transmission / distribution network reduces the degree of capacity deterioration of the power storage device. It discloses the configuration to be executed. Regarding the supply and demand of electric power in the distribution network, Patent Document 4 discloses a system for predicting the electric power demand of an electric power consumer at a future date and time from a past database in the electric power transaction. Such a system predicts the power demand of the power consumer at a future date and time, acquires the power consumption of the power consumer at the date and time, and the predicted power demand forecast amount and the power consumption measured by the power measurement unit. Based on the above, it is configured to send a demand prompting the power consumer to adjust the power consumption so that the power consumption matches the predicted power demand.

International release 2011/016273 JP 2013-13240 JP 2016-34170 JP 2013-102637

By the way, when many users who are powered from a certain distribution network use electric power (devices that consume electric power) all at once, the electric power demand (electric power consumption) increases temporarily or transiently, and it becomes If is relatively rapid or large-scale, changes in the amount of power supply cannot keep up, and the balance between supply and demand of power in the distribution network may become unstable. In fact, for example, in Europe, when the Soccer World Cup was being broadcast on TV, the refrigerators were opened and closed all at once at homes watching TV during half-time, resulting in a shortage of power supply in the power grid, resulting in a large scale. Cases have been reported in which a significant voltage drop occurred. In this regard, in general, in a distribution network to which a power generation capable of adjusting the amount of power generation such as a thermal power plant, a nuclear power plant, or a hydropower plant is connected, the power supply is adjusted by adjusting the amount of power generation. Where it can be changed, in the future, events, etc., especially large-scale events will be held, and when there are more opportunities for them to be relayed through media such as TV broadcasting and broad distribution, many users will respond to the progress of the event etc. There are more opportunities for temporary or transient increases in large-scale power demand over a wide area due to the use of electrical appliances involved in the behavior of the power plant, and it may not be enough to adjust the amount of power generation at the power plant. Expected to increase. Therefore, a configuration that can add power supply in addition to the amount of power generation at the power plant so that the power supply can be made to follow such temporary or transient changes in power demand to a more sufficient degree. Is preferably incorporated into the power grid. As a configuration that can add power supply in response to a temporary or transient increase in power demand in response to such a reason, a power storage device is connected to the distribution network, and the power storage device can also be used. A configuration is conceivable in which power can be supplied to the distribution network in response to an increase in power demand. At that time, by referring to the progress of events, etc., it is predicted that a temporary or transient increase in power demand will occur, and before the change occurs, the SOC of the power storage device will be increased to make the power storage device. If the amount of electricity is stored, it will be possible to supply the amount of electricity so as to meet the demand for electricity.

Thus, one problem of the present invention is that in a distribution network that distributes and supplies electric power to a plurality of users, a power storage device is connected, and an increase in electric power demand corresponding to the progress of an event or the like is expected. Occasionally, it is to provide a configuration in which the SOC of the power storage device is controlled to store the amount of electric power so that the electric power can be supplied to the distribution network in response to the increase in the electric power demand. (In the following, when referring to electric energy, electric power supply, electric power demand, electric energy consumption, etc., it means energy amount [watt x time], and electric energy, electric power demand, power consumption, supply. When we say electric power, we mean the power [watt].)

According to the present invention, the above-mentioned problem is an SOC control device that controls the SOC of the power storage device in a distribution network to which at least one user electric device, a power generation device, and a power storage device are connected.
An event prediction information acquisition means for acquiring prediction information of the occurrence of an event that can cause an increase in power demand by the user electric appliance.
When the prediction information is obtained, the power storage device is supplied with the power distribution network so that the amount of power predicted to be consumed by the user electric power when the event of the prediction information occurs is supplied in the distribution network. It is achieved by a device including an SOC control means that controls the SOC so that power can be discharged from the.

In the above configuration, the "distribution network" may be, as already mentioned, a distribution network of a normal aspect in which the power generated by the power plant or the power generation device is distributed and supplied to a plurality of users. The "user electric appliance" may be a device that consumes power used by each user, for example, a refrigerator, a television, a washing machine, an air conditioner, a cooking utensil, an acoustic device, or the like, and an automobile equipped with a storage battery. May be. The power generation device may be a generator or a power generation device of any type of power plant using thermal power, hydraulic power, nuclear power, etc., and is a naturally variable power generation power source (renewable) using solar power, wind power, geothermal power, tidal power, etc. It may be power generation using possible energy). The power storage device may typically be a charge / discharge rechargeable lithium-ion battery or a power storage device including other rechargeable / dischargeable storage batteries (eg, lead-acid battery, nickel-metal hydride battery, NAS battery), or a power storage device. It may be a power storage device including. Typically, one power storage device is equipped with a plurality of storage batteries or storage devices. The power storage device may be installed for each user, for each group of a certain number of users, or for each distribution network. As described above, "SOC" is represented by the charge amount / electric capacity of the storage battery or the capacitor, and "SOC control means" is an arbitrary used in this field of charging and discharging the storage battery or the capacitor to control the SOC. It may be a device including a control device of the type (BMU (Battery Management Unit) or the like). An "event that can cause an increase in power demand due to at least one user's electric power" is required of the power grid by at least one user or a large number of users using the electric power at the same time when the event occurs. It may be an event in which the demand for electric power increases. Specifically, for example, the start / end of sports games, music concerts, plays, shows, etc. that are broadcast on TV or distribution and are viewed by many users, the start / end of their breaks, and the start of TV / distribution programs. -It may be any event that triggers the end, the start / end of the CM, or another user operating the electric appliance to change the usage state of the electric appliance. The "predictive information" of the occurrence of such an event is information for notifying that the above-mentioned event will occur in the near future (for example, after a few minutes, a few minutes, an hour, a few hours, etc.). Yes, it may be obtained from information (event information) provided by the organizer or related party of the event, etc., the sender of the television / distributed program, or the related party. For example, forecast information may be provided by a provider of information such as an event, or it is expected that the amount of power demanded by a distribution network administrator or operator from the information such as an event will increase. Events may be selectively extracted.

In the operation of the above-mentioned device of the present invention, when the event prediction information acquisition means acquires the prediction information of the occurrence of an event that can cause an increase in power demand, the SOC control is performed in response to the acquisition. The means performs control of the SOC of the power storage device. In such SOC control, specifically, when an event predicted by the prediction information occurs, the electric energy predicted to be consumed by the user electric appliance is stored so as to be supplied by the distribution network. So that the electric energy can be discharged from the device, that is, the electric energy supplied from the power generation device of the distribution network and the electric energy discharged from the power storage device can cover the electric energy expected to be consumed by the user electric appliance. In addition, the SOC of the power storage device is adjusted so that the electric energy can be stored in the power storage device. In the embodiment, when the prediction information of a certain event is obtained, the SOC control means corresponds to the predicted amount of electric energy generated by the occurrence of the event, and the SOC target value of the power storage device ( The target SOC) is determined, and the SOC is adjusted to be high so that the SOC of the power storage device reaches the target SOC. It should be noted that such SOC control is preferably completed before the event predicted by the prediction information occurs. Charging of the power storage device in the SOC control is achieved by disconnecting the distribution network from the power generation device connected to the distribution network and supplying electric power.

According to the above-mentioned configuration of the device of the present invention, when an event occurs in which the demand power of the user electric power (usually a plurality) connected to the distribution network increases, the connection to the distribution network is prepared in preparation for the occurrence of the event. The SOC is controlled by charging the power storage device before the occurrence of an event so that the power storage device can supply the power amount that can meet the expected power consumption amount in the distribution network by discharging the power from the power storage device. The Rukoto. As a result, even if the power demand of the user's electric appliances increases due to the occurrence of an event, the power is supplied from the power storage device, and the power supply becomes unstable due to the shortage of the power supply in the distribution network. It will be suppressed or avoided.

In the above-mentioned configuration of the device of the present invention, the SOC control of the power storage device after the prediction information is acquired may be executed in consideration of the power supply capacity of the power generation device connected to the distribution network. Specifically, the SOC of the power storage device determines the shortage of the power supply amount of the power generation device with respect to the power demand amount of the user electric appliance at the time when the event of the prediction information occurs, by the amount of power discharged from the power storage device. It may be controlled so that it can be compensated. When the power generation device includes a naturally fluctuating power generation source such as solar power, wind power, geothermal power, and tidal power, the amount of power generation that predicts the amount of power generation of the naturally fluctuating power generation power source at the time when the occurrence of an event is predicted. A prediction means is provided, and the SOC of the power storage device may be controlled so that a part of the power demand of the user electric power is covered by the power amount predicted by the power generation amount prediction means. In that case, the SOC of the power storage device is controlled to a lower value than when there is no power generation amount of the naturally fluctuating power generation, and the frequency of charging / discharging at a high SOC, which is one of the causes of deterioration of the storage battery, is reduced. It is advantageous.

Further, in the above-described configuration of the present invention, if a limit is set for the change width of the SOC in the SOC control of the power storage device, the limitation may be temporarily lifted. Generally, in a storage battery such as a lithium-ion battery, when charging / discharging is executed with a high SOC, the potential difference between the electrode and the electrolytic solution becomes large, and the storage battery deteriorates (decrease in chargeable capacity). In the SOC control of the power storage device, an upper limit value is set for the SOC for the purpose of preventing or suppressing the deterioration of the storage battery, and the SOC is restricted from being charged in excess of the upper limit value. May be present. However, even if the SOC reaches the upper limit in the SOC control for supplementing the power demand by the user electric power that increases with a certain event by the power supply from the power storage device as described above. It may happen that the power demand due to the use of the user's electric power due to the event cannot be sufficiently covered. Therefore, in such a case, the SOC control is modified so that the SOC is temporarily allowed to increase beyond the upper limit when the prediction information of the occurrence of the above-mentioned event is acquired. good. As a result, a larger amount of electric power is temporarily stored in the power storage device, and a larger amount of electric power can be supplied to the distribution network when the electric power demand increases due to the use of the user electric appliance due to the event.

In the above-mentioned configuration of the apparatus of the present invention, in response to the prediction information of the occurrence of a certain event that can cause a change in the demand power, the predicted amount of the electric energy generated by the occurrence of the event corresponds to. The target SOC is determined. For such configurations, the target SOC may be determined for each event expected to occur in any manner. In one embodiment, for each event, a lookup table or list of the predicted amount of power demand (predicted amount of power demand) is prepared in advance with reference to the power consumption when a similar event occurs in the past. When the forecast information of the event occurrence is obtained, the power demand forecast amount corresponding to the predicted event may be selected from the lookup table or the list, and the target SOC may be selected based on the forecast amount. .. In addition, as another aspect, various parameters that are considered to affect the type of event when various events occur and the power consumption of the user equipment (normal demand power value or demand power pattern of each user, weather). Information, time zone, weekday or holiday, etc.) is used as an input, and machine learning is executed using the power demand or power consumption when various events occur as an output, and various events occur. Create a regression calculator that calculates the predicted amount of power consumption or demand at the time of the event, and when the forecast information of the event occurrence is obtained, use the regression calculator to predict the power demand corresponding to the predicted event. And based on that, the target SOC may be determined. In the regression calculator by machine learning, the target SOC may be directly output. Further, the predicted amount of power consumption or power demand here may be calculated for each user, and in that case, the predicted amount of power demand of the user who is actually using the distribution network is selected. It is possible to accurately predict the amount of power demand that accompanies an event in the distribution network based on the total sum.

By the way, in an area where a plurality of distribution networks exist adjacent to each other, the amount of power demand in each distribution network may be different. In that case, it is preferable that the total capacity of the power storage device connected to the distribution network can be increased in the region of the distribution network where the power demand is expected to be large. In this regard, if at least a part of the power storage device is mounted on a vehicle such as an electric vehicle, the vehicle equipped with the power storage device is moved to the area of the distribution network where the power demand is expected to increase. By connecting each power storage device to the distribution network, it is possible to increase the total capacity of the power storage device in the distribution network in the corresponding area. Therefore, in the apparatus of the present invention, when the predicted power demand amount differs depending on the area of the distribution network when the event occurrence prediction information is acquired, the power demand predicted amount is large. Information for encouraging the movement of the vehicle equipped with the power storage device may be transmitted to each vehicle. Specifically, in the device, a means for determining the predicted amount of power demand in the distribution network in each area in response to the prediction information, and a vehicle equipped with a power storage device based on the predicted amount in each area. There is a means for determining the area (target area) to collect the information, and a means for providing each vehicle with information (vehicle guidance information) for moving the vehicle to the target area and connecting the power storage device to the power grid. May be done. The vehicle guidance information may be, for example, information such as temporarily reducing the charging charge in the target area.

Thus, according to the above-mentioned configuration of the present invention, even when the electric power demand increases temporarily or transiently due to the users using the electric appliances all at once due to an event such as an event. Prior to the occurrence of an event, the SOC of the power storage device is increased, and when an event occurs, the power is discharged from the power storage device in addition to the power supply amount of the power generation device connected to the distribution network. By controlling the SOC, it becomes possible to stably maintain the power supply. The configuration of the apparatus of the present invention may be applied to a distribution network in which electric power is supplied from a power plant such as thermal power, hydraulic power, or nuclear power that has been used conventionally, and utilizes renewable energy that has become widespread in recent years. It may be applied to a distribution network to which power is supplied by a power generation device.

Other objects and advantages of the invention will be apparent by the following description of preferred embodiments of the invention.

1 (A) and 1 (B) are schematic block diagrams of a distribution network to which the SOC control device of the power storage device according to the present embodiment is applied. (A) is a type in which a power storage device is connected to the main trunk of the distribution network (centralized type), and (B) is a type in which a power storage device is connected to each user (distributed type). FIG. 1C is a diagram showing the configuration of the SOC control device of the power storage device according to the present embodiment in the form of a block diagram. FIG. 2 shows that in the SOC control device of the power storage device according to the present embodiment, machine learning is used to calculate the predicted amount of power demand at the time of event occurrence in response to the acquisition of event occurrence prediction information. It is a diagram schematically depicting a regression arithmetic unit. FIG. 3 is a diagram illustrating a range of SOC of a storage battery controlled by the SOC control device of the power storage device according to the present embodiment. FIG. 4 is a diagram showing the operation of the power storage device in the SOC control device according to the present embodiment in the form of a flowchart. FIG. 5A is a schematic block diagram of a power distribution network configured to connect a power storage device mounted on a vehicle. FIG. 5B shows a large amount of power demand at the time of an event when the SOC control executed by the SOC control device of the power storage device according to the present embodiment is applied in an area where a plurality of distribution networks are adjacent to each other. It is a figure schematically explaining the state of guiding a vehicle equipped with a power storage device to the area of a distribution network which is predicted to become.

1 ... Power plant 2 ... Naturally variable power generation 3 ... Substation 4 ... Centralized power storage device 10 ... Distribution network pt ... Pole transformer B ... Distributed power storage device P ... Naturally variable power generation (distributed type)
EV: A vehicle equipped with a power storage device

Some preferred embodiments of the present invention will be described in detail below with reference to the accompanying figures. In the figure, the same reference numerals indicate the same parts.

Overview of the power grid With reference to FIGS. 1 (A) and 1 (B), the SOC control device of the power storage device of the present embodiment basically uses at least one user for the power generated by the power generation device such as a power plant. It may be applied to the distribution network 10 of the usual aspect of distributing to the electric power of the above. In the distribution network 10, the power generation device that is the power supply source may be a generator of any type of power plant 1 such as thermal power, hydraulic power, nuclear power, etc., and may use solar power, wind power, geothermal power, tidal power, and the like. It may be the naturally variable power generation power source 2 used. The power generated by the power plant or the naturally fluctuating power generation source is transmitted to the distribution substation 3 while being stepped down in order at a high voltage in the normal manner, and further consists of distribution lines from the distribution substation 3. It is distributed to users (households, shops, commercial facilities, public facilities, factories, etc.) via the distribution network 10 (when power is supplied from the distribution network 10 to the user's electric appliances, it is usually supplied by a pillar transformer pt or the like. , The voltage is stepped down to the voltage used by the electric appliance.) From the distribution substation, a plurality of distribution networks 10 of a system in which power transmission is controlled independently of each other may extend.

When the present embodiment is applied to the distribution network 10 as described above, the electric power generated and transmitted by the power generation devices 1 and 2 can be further stored, and the electric power to the distribution network or the user's electric power can be stored. A power storage device (4, B) including a storage battery or a power storage device capable of supplying power is connected. The power storage device may be directly connected to the distribution network 10 as schematically depicted in FIG. 1 (A) (centralized power storage device 4), or as shown in FIG. 1 (A). As depicted schematically, it may be connected to each user (state indirectly connected to the distribution network, distributed power storage device B). The storage battery mounted on the power storage device is typically a chargeable / dischargeable lithium ion battery, but other chargeable / dischargeable storage batteries such as a lead storage battery, a nickel hydrogen battery, and a NAS battery may be used. The charge / discharge of the centralized power storage device 4 as shown in FIG. 1 (A) may be executed based on the operation by the administrator or the operator of the distribution network, and the charge / discharge of the distributed power storage device as shown in FIG. 1 (B) may be executed. May be executed based on an operation by the administrator or operator of the grid, or based on an operation by the user or based on an operation according to a preset program. When these power storage devices cannot meet the user's power demand in the distribution network only by the amount of power supplied from the power generation device, they release the stored power amount, whereby the power in the distribution network is released. It works to stabilize the supply. Then, in particular, in the present embodiment, as will be described later, when the SOC control device acquires the prediction information of the occurrence of an event such as an event, in response to this, the electric energy amount to the power storage device 4 or B. The target SOC of the power storage device 4 or B is determined, and the control of matching the SOC of the power storage device with the target SOC is executed. Further, the distribution line downstream of each user's pole transformer pt or the like may be equipped with a naturally variable power generation P such as a solar power generation device, and the power generated there may also be the power storage device B (or 4). ) May be stored. Although not shown, the state of each device of each user is controlled by the energy management system (EMS) with reference to the state of the distribution network and the state of each device of each user. The SOC controller described above may be configured as part of the EMS.

Configuration of SOC Control Device The SOC control device of the power storage device according to the present embodiment may be typically a computer device, and is connected to each other by a bidirectional common bus (not shown) in a normal manner. A CPU, a storage device, and an input / output device (I / O) are equipped, and the operation of each part in the device is achieved by executing a program in the CPU. Communication of the control signal and the signal indicating the state of the storage battery or the like between the SOC control device and the power storage device may be achieved by a normal wired communication or wireless communication method. With reference to FIG. 1C, in the embodiment, the SOC control device more specifically acquires the prediction information of the occurrence of an event such as an event, and in the distribution network at the time of the occurrence of the event. A power demand prediction unit that predicts the amount of power demand to be used, a target SOC determination unit that determines the target SOC of the power storage device by referring to the power demand forecast amount, and a storage battery or a storage device (storage battery, etc.) of the power storage device by referring to the target SOC. ) May include a BMU that controls charging and discharging of a storage battery or the like in order to match the SOC with the target SOC.

In such a configuration, in the power demand prediction unit, the prediction information of the occurrence of an event such as an event acquired is more specifically, as already mentioned, the occurrence of the occurrence of the user in the distribution network. This is information for notifying that an event in which the amount of electric power demand increases due to the use of an electric device will occur in the near future, for example, after a few minutes, a few minutes, an hour, or an hour. Such events include, for example, the start of sports games, music concerts, plays, shows, etc. that are broadcast on television or broadcast and watched by many users, the start / end of their breaks, the end of those breaks, and television / broadcast programs. It may be the start / end of the CM, the start / end of the CM, or any other event. Then, the prediction information of the occurrence of such an event may be provided to the electric power demand amount prediction unit in an arbitrary manner prior to the occurrence of the event. Specifically, such forecast information can be obtained, for example, by requesting the organizer of an event or a related person, the sender of a television / distributed program or a related person, etc. in advance, or before the event occurs to those persons. It may be acquired by having the forecast information sent to. Alternatively, an event in which the distribution network manager or operator is expected to change the amount of power required for the distribution network by referring to the information on the event occurrence schedule provided by the parties concerned such as the event. May be extracted and given to the power demand forecasting unit as appropriate.

Thus, the power demand prediction unit determines the power demand of the user electric power in the distribution network at the time of the occurrence of the event, that is, the power demand, according to the event predicted to occur by the acquired prediction information. Make predictions. Such prediction of power demand may be made in any manner. For example, in one embodiment, for each event, a lookup table or list of the predicted amount of power demand is created and predicted based on the amount of power demand when a similar event occurred in the past. When the information is acquired, the predicted amount of power demand corresponding to the event predicted to occur in the information may be read from the lookup table or list. It should be noted that the amount of electric power demand fluctuates depending on the situation at the time of the event, for example, the weather, the time zone, weekdays or holidays, so that different predicted amounts can be obtained according to each situation. May be good.

In another aspect, as schematically depicted in FIG. 2, parameters configured by machine learning that are considered to affect the type of event that occurs and the power consumption of the user's equipment, such as , The normal power consumption value or power pattern of each user, the weather information at the time of the event, the time zone, the weekday or the holiday, etc. are input, and the regression calculator that calculates the power demand forecast amount is used. Forecasting of electricity demand may be performed. Such a regression calculator uses various parameters as inputs, which are considered to affect the type of event when various events occur and the power consumption of the user equipment, and determines the power consumption when various events occur. As an output, it may be constructed by any machine learning technique such as deep learning. It should be understood that the parameters used as inputs may be other than those shown in the examples and are also within the scope of the present invention. In addition, every time an event that increases the power consumption of the user equipment occurs, the regression calculator is learned using the event type, other parameters, and the electric energy as teacher data, and its accuracy. May be improved. The power demand of each user can be obtained by collecting the value measured by the smart meter installed for each user.

The power demand forecast may be executed for each user, and the power demand forecast amount for the entire distribution network may be given by the total power demand forecast amount for each user. For example, when it is predicted that the user will be absent at the time of the event, such user's portion may be excluded from the power demand forecast amount of the entire distribution network, and such processing may accurately predict the power demand amount. It is expected that it can be done.

In the target SOC determination unit of the SOC control device, the target SOC, which is the target value of the SOC of the power storage device that should be achieved before the occurrence of the event, is determined based on the power demand forecast amount. In making such a decision, the current electric capacity, temperature, etc. of the storage battery received from the BMU of the power storage device are referred to, and the power is supplied through the distribution network in consideration of the amount of power that can be discharged from the storage battery or the like. The target SOC is determined so that the amount of electric power that can cover the predicted amount of electric power demand is stored in the storage battery or the like according to the amount of electric power. In this regard, the amount of electric power to be stored in the storage battery or the like may be an amount obtained by subtracting the amount of electric power that can be supplied from the power plant or the like when an event occurs from the predicted amount of electric power demand. In particular, when the naturally variable power generation power source 2 or the distribution line downstream of each user's pillar transformer pt is used as the power generation device for supplying power to the distribution network, the figure shows the figure. As shown in 1 (C), a natural fluctuation type power generation amount prediction unit is provided, in which the predicted power generation amount of the natural fluctuation type power generation 2 or P at the time of occurrence of an event is referred to by referring to the weather information and the like. In calculating the amount of power to be stored in the storage battery or the like, the predicted power generation amount may be subtracted from the predicted power demand amount to determine the amount of power to be stored in the storage battery or the like. .. If each user is equipped with a naturally fluctuating power generation P, the natural fluctuation type power generation amount prediction unit predicts the power generation predicted amount of each user's naturally fluctuating power generation P, and each user's power demand. The predicted amount is recorded as a value obtained by subtracting the predicted power generation amount of the naturally fluctuating power generation P from the power consumption amount of each user's electric power, and the amount depends on the power amount supplied from the distribution network and the power storage amount of the power storage device. The target SOC may be determined to cover it. Alternatively, when each user is equipped with a naturally fluctuating power generation P and a power storage device B, the estimated power demand of each user naturally fluctuates from the amount of power predicted to be used by each user's electric power. The power generation device B of each user is recorded as a value obtained by subtracting the predicted power generation amount of the power generation P, and the amount can be covered by the electric power supplied from the distribution network and the electric energy of the power storage device B of each user. The target SOC may be determined. As a result, the target SOC can be set lower, and the chances of operating the storage battery or the like at a high SOC are reduced, so that deterioration of the storage battery or the like can be suppressed. (The current electric capacity of the storage battery or the like can be measured by appropriately charging the storage battery or the like on a trial basis and then measuring the amount of discharge when the storage battery or the like is completely discharged.)

Regarding the determination of the target SOC, as another aspect, when the forecast information of the occurrence of an event such as an event is acquired, the target SOC is directly determined without determining the power demand forecast amount. It may be. Even in that case, the target SOC may be set in consideration of the power supply capacity of the power generation device. For example, when the prediction information is acquired, the target SOC may be set to the maximum value of the SOC that can be achieved in the power storage device. Further, a target SOC may be set for each power storage device or for each storage battery or the like, and each SOC may be controlled so as to achieve each target SOC.

The BMU that controls the charging / discharging of the storage battery or the like of the power storage device may be of a normal aspect. When the target SOC is received, the storage battery or the like may be charged / discharged so that the SOC matches the target SOC by the operation of the BMU (usually, the SOC may be equal to or higher than the target SOC, so the SOC is the target. Charging is performed to match the SOC.). The BMU may be charged and discharged to control the SOC of one or more storage batteries and the like.

By the way, in the charging / discharging of the storage battery or the like, in order to suppress the deterioration of the storage battery or the like, as schematically shown in FIG. 3, the SOC range in which the storage battery or the like is operated is limited, and during normal operation. , SOC may be controlled so as not to deviate from such a limiting range. In this regard, as described above, in order to prevent the shortage of the supplied power due to the increase in the power demand when an event such as an event occurs and the destabilization of the supplied power due to the increase, the amount of power can be discharged from the power storage device. In a configuration in which the amount of power is stored in the power storage device, when the target SOC corresponding to the predicted power demand exceeds the upper limit of the SOC limit range, the SOC exceeds the upper limit in order to achieve the target SOC. You may be able to climb. That is, in order to achieve the target SOC corresponding to the acquisition of the prediction information of the occurrence of an event such as an event, the increase of the SOC outside the limit range of the SOC for normal operation may be allowed (). As shown in the figure, when the SOC lower limit value is set, discharge may be permitted to a value where the SOC is lower than the SOC lower limit value). According to such a configuration, it is possible to supply electric power from the power storage device to a more sufficient degree than the electric power demand amount when an event such as an event occurs.

Operation of SOC Control Device With reference to FIG. 4, in the operation of the SOC control device, when the prediction information of the event occurrence is acquired by the power demand forecasting unit (step 1), the power at the time of the event occurrence is obtained. The demand amount is predicted (step 2), and the power demand forecast amount is transmitted to the target SOC determination unit. As described above, the target SOC determination unit refers to the predicted amount of power demand and the predicted amount of power supply of the power generation device (step 3), and the amount of power to be stored in the power storage device (required stored power amount = power). The amount obtained by subtracting the predicted amount of power supply from the predicted amount of demand) is determined (step 4), the state of the storage battery of the power storage device is detected (step 5), and the power storage device connected by the distribution network is detected. The target SOC is determined so that the required stored electric energy is stored in the storage battery or the like (step 6), the target SOC is sent to the BMU, and the BMU charges the storage device so that the SOC reaches the target SOC. Is executed (step 7). Such charging is performed by supplying the electric power generated by the power plant 1 or the naturally variable power generation power source 2 (or P) to a storage battery or the like. Then, when the predicted event occurs, the power storage device is put into a state in which it can be discharged (step 8), and the power is discharged from the power storage device to the distribution network.

When using a power storage device mounted on a vehicle In an area where a plurality of distribution networks are arranged adjacent to each other, the amount of power demand in each distribution network at the time of an event may differ. In such a case, it is preferable to prepare more power storage devices in the area where the power demand is large, but the area where the power demand is large may change depending on the type of event and the timing of its occurrence. By the way, in recent years, vehicles equipped with a large-capacity power storage device such as an electric vehicle have become widespread, and the power stored in the power storage device mounted on such a vehicle is used as the power used by each user's electric power. Alternatively, it has been proposed and put into practical use that the power storage device mounted on the vehicle is used as a power storage device equipped by each user to store the electric power generated by the solar power generation device or the like. be. For example, as shown in FIG. 5A, a connection end of a power storage device mounted on a vehicle is provided on a distribution line downstream of the pole transformer pt of each user, and electric power is supplied between the power storage device and the distribution line of the vehicle. A configuration that enables transmission and reception of power has been put into practical use. In such a configuration, the installation location of the power storage device can be changed by moving the vehicle. Therefore, by guiding a vehicle equipped with a power storage device to an area where a distribution network is installed where the amount of power demand increases when a certain event occurs and collecting the power storage in that area, the power storage in that area is performed. The possible capacity will increase, and more reliably it will be possible to increase the amount of power stored to meet the increasing power demand when an event occurs.

Thus, as another aspect of the present embodiment, in an area where a plurality of power grids are adjacent to each other, a power storage device mounted on a vehicle can supply electric power to the power grid. When the event occurrence prediction information is acquired, the information for urging the vehicle equipped with the power storage device to move to the region where the electric power demand is large may be provided. For example, as schematically shown in FIG. 5B, when distribution networks are deployed in adjacent regions a to e, when a certain event occurs, the power demand amount pPhd in the region d is other. When it is predicted that the power demand in the region will increase relatively with respect to the power demand pPha ..., the vehicle EV existing in the other regions will be moved to the region d and stored in the distribution network. Information (vehicle guidance information) prompting to connect the device is given. The information for guiding such a vehicle to a specific region may be, for example, information such as lowering the charging price in the region where the power demand is predicted to increase particularly. In order to achieve such a situation, in the SOC control device of the present embodiment, the means for determining the predicted amount of power demand in the distribution network in each region in response to the forecast information, the predicted amount in each region. A means of determining a target area for collecting vehicles equipped with a power storage device based on the method, and a means of providing each vehicle with vehicle guidance information for moving the vehicle to the target area and promoting the connection of the power storage device to the power grid. It may be provided. Alternatively, when an SOC control device is provided for each distribution network, each SOC control device refers to the power demand forecast amount of the SOC control device in the neighboring area, and the vehicle moves to the area where the power demand forecast amount is larger. There may be a means for providing each vehicle with vehicle guidance information for moving the vehicle.

Although the above description is made in relation to the embodiments of the present invention, many modifications and modifications can be easily made by those skilled in the art, and the present invention is limited to the embodiments exemplified above. It will be apparent that, without limitation, it applies to various devices without departing from the concept of the present invention.

Claims (1)

An SOC control device that controls the SOC of the power storage device in a distribution network to which at least one user electric device, a power generation device, and a power storage device are connected.
An event prediction information acquisition means for acquiring prediction information of the occurrence of an event that can cause an increase in power demand by the user electric appliance.
When the prediction information is obtained, the power storage device is supplied with the power distribution network so that the amount of power predicted to be consumed by the user electric power when the event of the prediction information occurs is supplied in the distribution network. A device including an SOC control means for controlling the SOC so that electric power can be discharged from the device.

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