JP2007295650A - Power management system for each dwelling of collective housing employing virtual power storage secondary battery, and power fee charging method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power management system and a power fee charging method which enable each dweller to easily enjoy merits of power saving in power supply in which a large-capacity secondary battery such as an NAS battery and a Zebra battery are arranged in a collective housing as emergency power sources and the leveling of a power load, in a high-technology collective housing where dwellings have Internet-connected power meters. <P>SOLUTION: In the power management system and the power fee charging method, it is assumed that a virtual battery is installed in one dwelling of the collective housing, and the virtual charging and discharging of the virtual battery is utilized for the power management of the one dwelling. The system is provided with a means for calculating the capacity of the virtual battery on the basis of data of a power consumption change database, a means for calculating a time band of charging the virtual battery on the basis of the data of the power consumption change database, and a means for calculating a time band of discharging the virtual battery on the basis of the data of the power consumption change database. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power management system and a power charge billing method in a housing complex where a power storage secondary battery is installed at a power supply end as if a virtual power storage secondary battery is deployed for each apartment house.

  In this specification, the actual power storage secondary battery actually disposed is simply described as “power storage secondary battery”, and is a virtual power storage secondary battery without an entity, A power storage secondary battery in which only a numerical value is set in a calculation simulation such as an electric energy is referred to as a “virtual battery”.

  The liberalization of power has made it possible to conduct IPP, that is, independent power supply, for apartment houses such as condominiums. Here, consider the power supply system to the housing complex. In general, power storage is important for power supply systems. The reason for the importance is as an emergency power source and for leveling the power load, and the latter is becoming more important not only from the customer merit but also from the viewpoint of energy saving.

  The power storage method includes technologies such as pumped-storage power generation, pressure power storage, and rotational power storage (flywheel), but a large-capacity secondary battery is an effective and realistic power storage device. It is also known and preferred that a large-capacity secondary battery is provided in an apartment house as an emergency power source in the event of a disaster or the like. In addition, it is publicly known and preferable that a power storage large-capacity secondary battery is provided in an apartment house for leveling the power load.

  That is, the concept of power supply in which a large-capacity secondary battery such as a NAS battery or a Zebra battery is provided in an apartment house and is charged at night and discharged during the day to level the power load is known. Since it is well known to install a large capacity secondary battery in a factory that consumes a large amount of power, application to a collective housing is easily conceived. Similarly, a configuration in which the secondary battery is provided with a small capacity and arranged in each house of the apartment house to equalize the electric load is also known.

  For example, Patent Document 1 discloses an apartment house that includes a plurality of residences, and includes a plurality of fuel cells provided for each of the plurality of residences and an individual control unit that controls the power generation amount of the plurality of fuel cells. (See claim 10 of Patent Document 1).

  Further, Patent Document 2 discloses a power supply system for an apartment house that is stored in a battery and stabilizes the power supply when using natural energy such as a solar battery or wind power generation.

  By the way, when deploying large-capacity secondary batteries in apartment buildings, comparing the deployment of large-capacity batteries at the power supply end and the small-capacity battery door-to-door arrangement, the former is superior in energy efficiency and cost, while the secondary battery in each house There is a merit for residents that there is easier to grasp the energy saving merit.

  FIG. 6 is an explanatory diagram of the large-capacity power storage secondary battery BB deployed at the power supply end of the apartment house M, while FIG. 7 is deployed at each door of the apartment house M (the power consumption end of M). It is explanatory drawing of the comparatively small high capacity | capacitance electric power storage secondary battery BS made. As shown in FIG. 7, it is not preferable to install a battery in each house from the viewpoints of both resident costs and battery efficiency. However, it is easier for residents to grasp the energy saving merit if each house has its own secondary battery. (For symbols in the drawings other than BB and BS, see the description of reference numerals)

On the other hand, in an advanced apartment house, an internet connection watt-hour meter is arranged in each house of the apartment house (see Patent Document 3 and Patent Document 4). It is easy to construct a database of changes in power consumption of each apartment house from the data collected by the connected electricity meter. There has been a demand for a power supply management system and a power billing method that effectively utilize this power consumption change database.
Japanese Patent No. 3737812 "Power Supply System, Apartment House, and Program" Japan Research Institute, Ltd. Japanese Patent Application Laid-Open Publication No. 2001-103676 PCT-JP2005-5378 (WO 2005/093924) "Power system for multiple power consumer gathering areas" IPPS PCT-JP2005-12399 (WO 2006/004112) "Power consumption measuring device and power management system" IPPS

  The problem to be solved by the present invention is a NAS battery, which is used as an emergency power source and for leveling the power load in an advanced apartment house in which an internet connected watt-hour meter is installed in each house of the apartment house. It is to provide a power management system and a power charge billing method that makes it easy for residents to grasp the energy saving merit by supplying power with a large-capacity secondary battery such as a Zebra battery installed in an apartment house.

  In addition, when constructing a new apartment house such as a condominium, it is disadvantageous for the sales after the new apartment house to be installed, because it would increase the price of the apartment house. However, it is preferable for a contractor who newly establishes a battery-deployed apartment house if a potential home buyer can easily grasp the merit as an emergency power supply by such battery deployment and the merit of leveling the power load. In other words, it is an object of the present invention to provide an apartment house that is easy to sell after it is newly established.

  The present invention was invented as one that enables the advantages of both “bundling large-capacity batteries at the power supply end of an apartment house” and “deploying small-capacity batteries door-to-door”. That is, (Claim 1), a power storage secondary battery is arranged at the power supply end of the apartment house, an internet connected watt-hour meter is installed in each house of the apartment house, and each apartment house house constructed from the electricity meter data Assuming that a virtual battery is installed in one door of an apartment house, the virtual battery is used for power management of the one house. Means for calculating a virtual battery candidate capacity based on the data of the power consumption change database, and time zone candidates for charging the virtual battery based on the data of the power consumption change database And a means for calculating a time zone candidate for discharging a virtual battery based on the data of the power consumption change database. It is the power management system.

  Here, (Claim 2), the capacity of the virtual battery of one of the apartment houses is smaller than the capacity of the power storage secondary battery at the power supply end of the apartment house, and the Internet connection watt-hour meter It has means for transmitting measurement data to the Internet by electronic message every predetermined time, and the data of the power consumption change database calculates the power consumption for each day of the month of one house of the apartment from the power data for each predetermined time. Statistically organized in time units. Patent Document 3 and Patent Document 4 describe in detail the Internet connection watt-hour meter and the means for transmitting to the Internet with a message every minute. The time interval for each predetermined time is preferably 1 minute, but may be 1 minute or more, in seconds, or in time.

  The system of the present invention (Claim 3) comprises means for determining the capacity of the virtual battery from the capacity candidate of the virtual battery, means for determining the charging time zone of the virtual battery from the time zone candidate for charging the virtual battery, and virtual A means for determining the discharge time zone of the virtual battery from the time zone candidates for discharging the battery is also provided, and any one of the capacity determination means, the charge time zone determination means, and the discharge time zone determination means is determined as one unit of the apartment house. It is a decision based on the decision of the resident of. In other words, the capacity of the virtual battery and other candidates are calculated and presented to the resident of the apartment house under various conditions, and the resident is determined by adopting those that can be accepted by the resident.

  The hardware configuration of the present invention is shown in FIG. In the figure, VB is a virtual battery that does not actually exist in each of the M doors (M power consumption end), and a virtual PS and virtual PCS that does not actually exist in each of the M doors (M power consumption end). It is. (PCS is a power conversion system that performs cross-flow conversion and charges the battery with PS power and sends the battery discharge power to the PS (Power Conversion System). PS is a power supply facility for M including high-voltage power receiving / transforming / distributing equipment. (Refer to the description of symbols for symbols

  FIG. 2 is a graph schematically illustrating the telegram data of the electric energy measurement value transmitted by the Internet connection energy meter IM. As can be seen from FIG. 2A, f (t) which is an instantaneous power consumption curve (a function of t) of each house of the apartment house M is obtained. As shown in FIG. 2A, f (t) also detects instantaneous power consumption, so that the unevenness of the graph is severe. If the measurement data of internet connection watt-hour meter is a minute unit, it is possible to grasp an instantaneous change in a unit of several minutes. Here, in order to grasp the large change in power consumption by ignoring the instantaneous change, the instantaneous power consumption f (t) is averaged at an appropriate short time interval T between 10 minutes and 30 minutes before and after the time t (moving time average). ) An average power consumption curve (function of t) g (t) may be obtained. g (t) is also shown in FIG.

  In FIG. 2B, the estimation of the power surplus time zone and the power shortage time zone is considered for each of the M houses. In FIG. 2B, 1 is the maximum value of the amount of power that can be supplied, and 2 is the margin of power corresponding to the instantaneous power consumption peak. 3 obtained by adding 2 to g (t) is larger than f (t) at an arbitrary t. Further, “margin 4 for surplus supply” in FIG. 2B is a power supply margin that assumes an emergency such as a power failure due to a disaster.

  It may be considered that the power shortage time zone is given as a time zone in which 3 obtained by adding 2 to g (t) is equal to or higher than the level of the power supply available amount 1. The power surplus time zone may be considered as a time zone in which 3 obtained by adding 2 to g (t) is equal to or less than the power level obtained by subtracting “room 4 for surplus supply” from the power supply available amount 1. There may be other methods for estimating the power surplus time zone and the power shortage time zone, but in this specification, the above estimation method will be described for the sake of simplicity.

  A data example of the power consumption change database is shown in FIG. The power surplus time zone and the power shortage time zone obtained for each day of the month by the above estimation method are obtained by statistically organizing.

  The power management system of the present invention presents the data of the power consumption change database to the resident along with the graphs as shown in FIGS. 2 (a) and 2 (b), which is a known technique. When the resident decides that there is sufficient power surplus from the presented data, he / she can request the power management system to deploy his / her own virtual battery (virtually deployed in his / her living area).

  The requested power management system of the present invention calculates and presents the virtual battery capacity, which is a capacity equal to or equal to the chargeable power amount or the value in the number 1 or number 2, based on the data of the power consumption change database. .

  If the calculated presentation capacity is charged in the power surplus time zone and discharged in other time zones, the difference between the unit power rate in the power surplus time zone and the unit power rate in the discharge time zone is Δprice and Δprice and charge / discharge power Since the integrated value of the amount is the merits of the resident's electricity rate (amount reduction), the merits of the electricity rate are presented. Residents can consider purchasing virtual batteries from these presentations. (Δprice = [unit power charge in the discharge time zone] − “unit power charge in the power surplus time zone”, [merit of the power charge of the resident] = Δprice × [charge / discharge power amount])

  FIG. 4 is an explanatory diagram of known power load leveling using a battery, and “recommended charging time zone” and “recommended discharging time zone” in the figure are respective candidate time zones. FIG. 4A shows that if the discharge is performed in the recommended discharge time zone due to power shortage, the supply amount becomes large in that time zone. FIG. 4B shows that a part of the power supplied in real time is covered by battery discharge. The areas showing the power in the shaded area in FIG. 4 are all the same.

  FIG. 5 is an explanatory diagram of a known power load leveling using a battery, as in FIG. 4. The hatched portion indicates the amount of power to be purchased by a resident who is fed in real time, and the area is (a) (b) (C) All are the same. FIG. 5 (a) shows a case where a battery is not used, and FIG. 5 (b) shows a case where the battery is charged in all recommended charging time zones. ) Is a case where the battery capacity is insufficient or charging / discharging is restricted, and the battery is charged in a part of the recommended charging time zone.

  The power charged in the recommended charging time zone is discharged in the recommended daytime discharging time zone. Since the electricity charge is low during the recommended charging time, such as at night, there are operational merits for the consumer by the difference from the electricity price during the recommended discharging time. This merit is calculated by the above-mentioned Δprice = [unit power charge in the discharge time zone] − “unit power charge in the surplus power time zone”, [merit electricity charge merit] = Δprice × [charge / discharge power amount] It is. Considering this merit and the selling price of the virtual battery (the seller of the apartment house sells in the name of “virtual battery usage right”), the resident considers the purchase of the virtual battery usage right. The initial investment for purchasing the right to use the battery and the operational benefits of using the battery can be clearly calculated, which is convenient.

  The effects of the present invention are as follows. Power consumption data is provided to residents in an easy-to-understand manner in apartment houses with internet watt-hour meters, and an energy-saving effect simulation by having a virtual battery is also provided in an easy-to-understand manner. In such simulation, the battery effect with high accuracy is presented to the resident. Study of power purchase contract including virtual battery purchase is facilitated from power consumption data and simulation. If the resident thinks that the purchase of the battery pays, the user can freely set the capacity and purchase. You can also change the capacity after purchase. These functions will also appeal to potential apartment buyers who are highly conscious of energy conservation. Apartment house sellers can recover their capital investment for battery installation by adding payments for virtual battery purchases by condominium purchasers (residents) in addition to reducing power purchase fees through power leveling.

  For example, it can be sold at a high price, asking an apartment purchaser to buy a large-capacity secondary battery. In other words, it is possible to hold a topical event such as bidding and selling at a battery value bid auction, and the advertising effect of an apartment to which this technology is applied can be obtained. There is a seller merit that the condominium purchaser can also pay the capital investment cost of installing a large-capacity secondary battery. (Investment cost risk diversification)

  As an embodiment of the invention, an example of a system flow will be described with reference to FIGS. When the resident sees that there is sufficient power surplus time zone, he requests the power management system to consider purchasing a virtual battery. The power management system is placed on a web server that is connected to the personal computer of the resident's residence and connected to the Internet.

  As shown in the beginning of the flowchart of FIG. 10, the resident first sets a period to be examined. Since the subsequent flow is as described in FIG. 10 and FIG.

  An example in which the power billing method of the present invention is implemented as a simulation on a resident's personal computer is shown in the right flow of FIG. Although overlapping with FIG. 1, the configuration of the proposed hardware is also depicted in FIG.

  According to another aspect of the present invention, there is provided a power billing method according to a fourth aspect of the present invention, wherein a power storage billing method is for each apartment house in which a power storage secondary battery is provided at the power supply end of the apartment house. The virtual charging / discharging of the virtual battery is taken into account for the power billing of the door having the virtual battery, and the virtual charging / discharging time zone is determined; It has the process of calculating an electric power charge that charging / discharging was actually performed in the time slot | zone.

  In the power billing method according to the present invention (Claim 5), the virtual battery capacity of one door of the apartment house is smaller than the capacity of the power storage secondary battery at the power supply end of the apartment house. It is preferable that an Internet connection watt-hour meter is installed in each house, and the Internet connection watt-hour meter performs a process of transmitting power amount measurement data to the Internet by a telegram every predetermined time.

  In the power billing method of the present invention (Claim 6), the step of determining the time zone during which the virtual battery is virtually charged / discharged is stored in the database data of the power consumption change of each apartment house constructed from the Internet connection watt-hour meter data. It is preferable to be based on this.

  The description of the power billing method of the present invention is omitted because it is the same as the contents described in the description of the power management system of the present invention. By implementing this billing method, the resident of the apartment house who is a purchase contractor of the right to use the virtual battery can enjoy the effect of the virtual battery virtually installed in his / her living area.

  On the other hand, the power manager of the apartment house (operator of the apartment house) virtually uses the real battery at the power supply end for the occupant. Since the charge / discharge efficiency of the large-capacity battery is superior to the charge / discharge efficiency of the small-capacity virtual battery, the power manager of the apartment house (operator of the apartment house) can also obtain the economies of scale due to the large capacity.

  The right to use the virtual battery is effective even in the event of an emergency such as a disaster, and residents can invest in securing an emergency power source. In other words, the entity can use the discharge power in an emergency that matches the value invested in the emergency value of the battery in the emergency use of the large capacity battery which is a shared facility, and is fair to the residents.

<Reference> FIG. 8 is a reference explanatory diagram showing a change in the maximum value of power supply. 11 is a strong wind if it is wind power, and it is a water supply season if it is hydropower. Is the maximum power supply value at a high level, 12 is a low wind if wind power, and a drought season if it is hydropower, and is the maximum power supply value at a low level where power supplied to each of the M houses is low ( (See the brief description of the drawing of FIG. 8). FIG. 9 is also a reference explanatory diagram for estimating charge / discharge time using a charge / discharge database related to the charge / discharge time of the battery (see the brief description of the drawing of FIG. 9). These are not directly related to the present invention, but are used for calculation of “charging time zone candidates” and “discharging time zone candidates”, and are therefore for reference.

In the apartment house M which is the object of the system and method of the present invention, the power storage secondary battery BB is provided at the power supply end, and the Internet connection watt-hour meter IM is provided at each house. It is the figure which graphed the data measured with IM, and the instantaneous power consumption curve (function of t) of each house of apartment house M It is the table | surface which illustrated the data of the power consumption change database, Comprising: The power consumption according to the day of the month of each house is statistically arranged by the time unit. In the explanatory diagram of the publicly known power load leveling using the battery, (a) shows that a large supply amount is obtained by discharging against power shortage. (B) indicates that part of the power consumption is covered by battery discharge. The area indicating the power in the shaded area is the same. In the explanatory diagram of publicly known power load leveling using batteries, the shaded portion indicates the purchased commercial power, and the areas (a), (b) and (c) are the same. (A) When no battery is used, (b) When there is sufficient battery capacity to charge the battery during all recommended charging time zones, (c) When the battery capacity is limited and the battery is charged in part of the recommended charging time zone This is when charging. The power charged in the recommended charging time zone is discharged in the recommended daytime discharging time zone. Since the electricity charge is cheap during the recommended charging time, such as at night, there are operational merits for the consumer as much as the difference from the electricity price in the recommended discharging time. The investment amount of the battery is determined by the initial investment of the battery and the operational merit of using the battery. Explanatory drawing of large-capacity power storage secondary battery BB deployed at the power supply end of apartment house M such as an apartment Explanatory drawing of the comparatively small large-capacity power storage secondary battery BS installed in each house (the power consumption end of M) of the apartment house M Similarly to FIG. 2B, the power surplus and the power shortage time zone are obtained from the change of the power demand (power demand). For example, (a) is a region where hydroelectric power generation is used, and the power surplus time zone is long and there is no power shortage time zone when the water is increasing, and if the region is using wind power generation, the wind is strong. On the contrary, (b) has a short power surplus time zone and a long power shortage time zone in a drought time if the region uses hydroelectric power generation, and a weak wind time if the region uses wind power generation. (A) Explanatory drawing of the time estimation which can discharge by the battery charge database which memorize | stored the charging time of the battery corresponding to the charging condition, (b) The battery discharge database which memorized the discharging time of the battery corresponding to the discharging condition Explanatory drawing of time estimation that requires charging by It is the creation flowchart (the 1) of the information displayed on a resident's personal computer with the power management system of this invention. It is a creation flowchart (the 2) of the information displayed on a resident's personal computer with the power management system of this invention. The information displayed in the figure is illustrated. It is the figure which showed the electric power bill billing method of this invention by the flowchart in the figure as a simulation example in a resident's personal computer. The hardware configuration is a part of FIG. 1, which is shown again in the figure.

Explanation of symbols

1 Maximum value of the amount of power supplied to each M house 2 The margin of energy corresponding to the instantaneous power consumption peak. 3 added to g (t) is larger than f (t) at an arbitrary t.
The curve of the electric energy obtained by adding 32 to g (t) (function of t)
4 A margin for surplus power supply. If 3 is lower than the level obtained by subtracting this margin from the maximum value 1 of the supplied power, the power is surplus.
11 The maximum supply power value at which the power supplied to each of the M houses is high in the case of strong winds if wind power is used, and in the case of hoisting water if it is hydropower.
12 The maximum amount of power supplied at a low level when power is supplied to each of the M houses in the case of windy winds when wind power is weak and drought season when water power is used.
BB Large capacity power storage secondary battery BSM provided at the power supply end of the BS M Relatively small capacity power storage secondary battery CL provided at each door (the power consumption end of the M) CL Information communication line CN Information communication Network (Internet)
CTP current-voltage converter (current-voltage sensor)
CTX Current-voltage sensor interface f (t) Instantaneous power consumption curve (function of t)
g (t) Averaged power consumption curve (function of t) obtained by averaging instantaneous power consumption at short time intervals T before and after time t
IM Internet watt-hour meter M Apartment houses such as condominiums PCS Equipment that performs cross current conversion and charges the battery with PS power and sends the battery discharge power to the PS (Power Conversion System)
PS Power consumption management means (PCs) installed in each door of M power supply equipment S0 M including high-voltage power receiving / transforming / distribution equipment
S1 Power consumption management means S2 arranged in the common area of M S2 Power supply management means S3 of the power supply company Security management means t of the security company t Power consumption observation time t1 Charging start time tx Charging completion time T Around time t A virtual PS and a virtual PCS that do not actually exist in each door (M power consumption end) of the virtual battery VP M that does not actually exist in each door (M power consumption end) of the short time interval VBM.

Claims (6)

A power storage secondary battery is deployed at the power supply end of the apartment,
An internet watt-hour meter is installed in each apartment house,
In a system for managing the power supply of each apartment house, which has a database of power consumption changes of each apartment house constructed from the electricity meter data,
Assuming that a virtual battery is deployed in one of the apartment houses,
Utilizing virtual charge / discharge of a virtual battery for power management of the one door,
Means for calculating virtual battery capacity candidates based on the data of the power consumption change database;
Means for calculating a time zone candidate for charging the virtual battery based on the data of the power consumption change database;
A power management system for each apartment house having means for calculating a time zone candidate for discharging a virtual battery based on data of the power consumption change database. The capacity of the virtual battery that one of the apartment houses has
The capacity is smaller than the capacity of the power storage secondary battery at the power supply end of the apartment house,
The Internet connection watt-hour meter has means for transmitting the energy measurement data to the Internet by telegram every predetermined time,
2. The power management system according to claim 1, wherein the data of the power consumption change database is obtained by statistically organizing the power consumption for each day of the month of one house of the apartment from the power data for each predetermined time. Means for determining virtual battery capacity from virtual battery capacity candidates, means for determining virtual battery charging time zones from time zone candidates for charging virtual batteries, and discharging virtual batteries from time zone candidates for discharging virtual batteries A means for determining a time zone is also provided, and the determination of any one of the capacity determination means, the charging time zone determination means, and the discharge time zone determination means is a determination based on a determination judgment of a resident of one house of the apartment house. Item 3. A power management system for each apartment house according to claim 1 or 2. In the electricity billing method for each apartment house where a power storage secondary battery is arranged at the power supply end of the apartment house,
Assuming one of the apartment houses has a virtual battery,
Considering virtual charging / discharging of the virtual battery in the power billing of the door having the virtual battery,
Determining a time zone for virtual charge / discharge of the virtual battery;
A method of charging a power charge for each apartment house, comprising a step of calculating a power charge on the assumption that charging / discharging is actually performed in the virtual charging / discharging time zone. The virtual battery capacity of a single apartment house
The capacity is smaller than the capacity of the power storage secondary battery at the power supply end of the apartment house,
Internet connection watt-hour meter is deployed in each house of the apartment house,
5. The method for charging a power charge according to claim 4, wherein said Internet connection watt-hour meter performs the step of transmitting the electric energy measurement data to the Internet by a telegram every predetermined time. 6. The time zone determining step for virtually charging / discharging a virtual battery is performed based on data in a database of power consumption change of each apartment house constructed from Internet connection watt-hour meter data. Power billing method.

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