JP2016153759A - Operation power value estimation device and method - Google Patents

Operation power value estimation device and method Download PDF

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JP2016153759A
JP2016153759A JP2015031997A JP2015031997A JP2016153759A JP 2016153759 A JP2016153759 A JP 2016153759A JP 2015031997 A JP2015031997 A JP 2015031997A JP 2015031997 A JP2015031997 A JP 2015031997A JP 2016153759 A JP2016153759 A JP 2016153759A
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current waveform
current
power value
waveform
distribution board
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JP6251207B2 (en
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文彦 石山
Fumihiko Ishiyama
文彦 石山
敏雄 渡辺
Toshio Watanabe
敏雄 渡辺
洋思 井上
Hiroshi Inoue
洋思 井上
孝 大山
Takashi Oyama
孝 大山
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日本電信電話株式会社
Nippon Telegr & Teleph Corp <Ntt>
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20End-user application control systems
    • Y04S20/242Home appliances
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20End-user application control systems
    • Y04S20/242Home appliances
    • Y04S20/244Home appliances the home appliances being or involving heating ventilating and air conditioning [HVAC] units

Abstract

PROBLEM TO BE SOLVED: To provide an operation power value estimation device and a method capable of estimating the power values of respective electric products even when an electric product continuously varied in current waveform shape.SOLUTION: An operation power value estimation device for estimating operation power values at one, two or more subordinate electric products from a current waveform at a power distribution board includes first measurement means for measuring current waveforms at every predetermined time periods by a plurality of times for each of one, two or more subordinate electric products of the power distribution board, a reference current waveform which is a waveform connecting most amplitude reducing points of the plurality of measured current waveforms for each of one, two or more electric products, second measurement means for measuring a current waveform at the power distribution board, and estimation means for estimating the operation power values of the respective electric products by setting the reference current waveform of one, two or more electric products as a plurality of bases and executing fitting so as to inscribe primary coupling by the plurality of bases in the measured current waveform at the power distribution board.SELECTED DRAWING: Figure 1

Description

本発明は、電流波形形状の連続変動を伴う電気製品が分電盤配下に含まれる場合の、分電盤配下の各電気製品の動作電力値の推定を行う動作電力値推定装置および方法に関する。   The present invention relates to an operating power value estimation apparatus and method for estimating an operating power value of each electrical product under a distribution board when an electrical product with a continuous variation in current waveform shape is included under the distribution board.
従来、家庭の分電盤に設置した電流センサを用いて電流波形を測定し、測定した波形の形状から、家庭内で動作している電気製品の電力値を推定して表示するシステム(特許文献1)がある。   Conventionally, a system that measures a current waveform using a current sensor installed on a distribution board at home and estimates and displays the power value of an electrical product operating in the home from the shape of the measured waveform (Patent Document) 1).
この文献に記載のシステムにおいては、事前に推定対象の電気製品の電流波形測定を行い、システムのデータベースに登録する必要がある。従来のシステムでは、電力値が常に一定の値をとり変動しないか、または電力値がとる一定の値が複数あって、それらの値の間で電力値が遷移することを前提としている。また、電流波形の形状も常に一定であることを前提としている。   In the system described in this document, it is necessary to measure the current waveform of the electrical product to be estimated in advance and register it in the system database. In the conventional system, it is assumed that the power value always takes a constant value and does not vary, or there are a plurality of constant values that the power value takes, and the power value transitions between these values. Also, it is assumed that the shape of the current waveform is always constant.
特開2013−238523号公報JP 2013-238523 A
しかしながら、例えばエアコン、冷蔵庫、テレビなどの電気機器では、出力レベルが経時的に変動し、それに伴い電流波形形状が変化してしまう。したがって、電流波形形状に連続変動のある電気製品が含まれる場合に各電気製品の電力値を推定しようとすると、データベースに登録された電流波形と一致した瞬間以外はデータベースに存在しない電流波形を用いて電力値を推定することになることから、正しい電力値推定が難しくなるという問題があった。   However, in an electric device such as an air conditioner, a refrigerator, or a television, for example, the output level varies with time, and the current waveform shape changes accordingly. Therefore, when an electric product with continuous fluctuation is included in the current waveform shape, when trying to estimate the power value of each electric product, the current waveform that does not exist in the database is used except for the moment when it matches the current waveform registered in the database. Thus, there is a problem that it is difficult to estimate the correct power value.
本発明は上記従来の課題に鑑みてなされたものであって、本発明の課題は、電流波形形状に連続変動のある電気製品が含まれる場合であっても、各電気製品の電力値推定ができる動作電力値推定装置および方法を提供することにある。   The present invention has been made in view of the above-described conventional problems, and the problem of the present invention is that estimation of the power value of each electric product is possible even when an electric product having a continuous variation in the current waveform shape is included. An object of the present invention is to provide an apparatus and method for estimating an operating power value.
上記の課題を解決するために、一実施形態に記載の発明は、分電盤における電流波形から、その配下にある1または2以上の電気製品における動作電力値を推定する動作電力推定装置であって、前記分電盤の配下の1または2以上の電気製品のぞれぞれについて、所定の時間周期ごとの電流波形をあらかじめ複数回測定する第1の測定手段と、前記1または2以上の電気製品について、前記測定された複数の電流波形のうちで最も振幅を小さくする点を結んだ波形である基準電流波形を算出する基準電流波形算出手段と、前記分電盤における電流波形を測定する第2の測定手段と、前記1または2以上の電気製品の前記基準電流波形を複数の基底として、該複数の基底による一次結合が前記測定した分電盤における電流波形に内接するようにフィッティングすることにより、前記各電気製品の動作電力値を推定する推定手段とを備えたことを特徴とする動作電力値推定装置である。   In order to solve the above problems, the invention described in one embodiment is an operating power estimation device that estimates an operating power value of one or more electrical products under its control from a current waveform in a distribution board. A first measuring means for measuring a current waveform for each predetermined time period a plurality of times in advance for each of one or more electrical products under the distribution board; A reference current waveform calculating means for calculating a reference current waveform that is a waveform connecting the points having the smallest amplitude among the plurality of measured current waveforms, and a current waveform in the distribution board. The second measurement means and the reference current waveform of the one or more electric products as a plurality of bases so that the primary coupling by the plurality of bases is inscribed in the measured current waveform in the distribution board By Ittingu, wherein an operating power value estimating device characterized by comprising a estimating means for estimating the operating power values of the respective appliances.
他の実施形態に記載の発明は、分電盤における電流波形から、その配下にある1または2以上の電気製品における動作電力値を推定する動作電力推定方法であって、前記分電盤の配下の1または2以上の電気製品のぞれぞれについて、所定の時間周期ごとの電流波形をあらかじめ複数回測定する第1の測定ステップと、前記1または2以上の電気製品について、前記測定された複数の電流波形のうちで最も振幅を小さくする点を結んだ波形である基準電流波形を算出する基準電流波形算出ステップと、前記分電盤における電流波形を測定する第2の測定ステップと、前記1または2以上の電気製品の前記基準電流波形を複数の基底として、該複数の基底による一次結合が前記測定した分電盤における電流波形に内接するようにフィッティングすることにより、前記各電気製品の動作電力値を推定する推定ステップとを含むことを特徴とする動作電力値推定方法である。   The invention described in another embodiment is an operating power estimation method for estimating an operating power value in one or more electrical products under the current waveform from a current waveform in the distribution board, the subordinate of the distribution board A first measurement step of measuring a current waveform for each predetermined time period a plurality of times in advance for each of the one or more electrical products, and the one or more electrical products measured A reference current waveform calculating step for calculating a reference current waveform, which is a waveform connecting the points with the smallest amplitude among the plurality of current waveforms, a second measuring step for measuring a current waveform in the distribution board, Fitting so that the reference current waveform of one or two or more electrical products is a plurality of bases, and the primary coupling by the plurality of bases is inscribed in the measured current waveform in the distribution board The Rukoto an operation power value estimation method which comprises the estimation step of estimating the operating power values of the respective appliances.
分電盤に取り付けた第1の実施形態の動作電力値推定装置の概略構成を示す図である。It is a figure which shows schematic structure of the operating electric power value estimation apparatus of 1st Embodiment attached to the electricity distribution panel. 電気製品1、2における電力値と測定電流の時間変動を示す図である。It is a figure which shows the electric power value in electrical products 1 and 2, and the time fluctuation | variation of a measurement current. 電気製品1、2の規格化電流波形Qm、n(t)および基準電流波形Qm(t)を示す図である。It is a figure which shows the normalized current waveform Qm , n (t) and the reference current waveform Qm (t) of the electrical products 1 and 2. 電気製品1のみの電流波形に対してフィッティングを実行した例を示す図である。It is a figure which shows the example which performed fitting with respect to the electric current waveform of only the electric product. 電気製品1、2の合成電流波形に対するフィッティングの様子を示す図である。It is a figure which shows the mode of fitting with respect to the synthetic | combination current waveform of the electric products 1 and 2. FIG. 分電盤に取り付けた第2の実施形態の動作電力値推定装置の概略構成を示す図である。It is a figure which shows schematic structure of the operating electric power value estimation apparatus of 2nd Embodiment attached to the distribution board.
以下、本発明の実施の形態について、詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail.
本発明では、分電盤配下の電気製品の電気製品ごとの電流波形を複数回取得して、規格化し、複数の規格化した電流波形のうち、最も振幅を小さくする点をつないだラインを取ることによって電気製品ごとの基準電流波形を算出し、データベースに蓄積する。この算出した基準電流波形は、電力値および測定電流の時間変動を考慮したものとなっている。さらに、データベースに蓄積された基準電流波形を重ね合わせたものを基底として分電盤で測定した電流波形に内接するようにフィッティングを行い、電力値を算出する。この構成によって、電流波形形状に連続変動のある電気製品が含まれる場合であっても、各電気製品の電力値推定を可能にする。電気製品の動作状態を正しく識別し、正確な電力値を表示できる。   In the present invention, the current waveform of each electrical product under the distribution board is acquired a plurality of times, normalized, and a line connecting the points with the smallest amplitude among the plurality of standardized current waveforms is taken. Thus, the reference current waveform for each electrical product is calculated and stored in the database. The calculated reference current waveform takes into account the power value and the time variation of the measured current. Further, fitting is performed so as to be inscribed in the current waveform measured by the distribution board using the superposition of the reference current waveforms accumulated in the database as a base, and the power value is calculated. This configuration makes it possible to estimate the power value of each electrical product even when electrical products having continuous fluctuations are included in the current waveform shape. It is possible to correctly identify the operating state of an electrical product and display an accurate power value.
(第1の実施形態)
図1は、分電盤に取り付けた第1の実施形態の動作電力値推定装置の概略構成を示す図である。本実施形態の動作電力値推定装置10は、図1に示すように、電気製品20に接続された電力線22と分電盤21とに取り付けられている。動作電力値推定装置10は、電気製品の電流波形を測定する第1の測定部1と、測定した電流波形を蓄積する蓄積部2と、蓄積した電流波形を規格化する規格化部3と、規格化した電流波形から家電製品の基準電流波形を算出する基準電流波形算出部4と、基準電流波形を保存するデータベース部5と、分電盤の電流波形を測定する第2の測定部6と、基準電流波形および分電盤の電流波形から電力値を算出する電力値算出部7と、算出した電力値を出力する出力部8とを備えて構成されている。第1の測定部1および第2の測定部6以外の構成は、必ずしも分電盤21の付近に設ける必要はなく、ネットワークに接続されたサーバ内に設けてもよい。なお、図1に示す構成では、電気製品20は1つのみが図示されているが、電気製品20は、複数接続されていてもよい。
(First embodiment)
FIG. 1 is a diagram illustrating a schematic configuration of an operating power value estimation apparatus according to a first embodiment attached to a distribution board. As shown in FIG. 1, the operating power value estimation apparatus 10 of this embodiment is attached to a power line 22 and a distribution board 21 connected to an electrical product 20. The operating power value estimation device 10 includes a first measurement unit 1 that measures a current waveform of an electrical product, a storage unit 2 that accumulates the measured current waveform, a normalization unit 3 that normalizes the accumulated current waveform, A reference current waveform calculation unit 4 that calculates a reference current waveform of a home appliance from a standardized current waveform, a database unit 5 that stores the reference current waveform, and a second measurement unit 6 that measures the current waveform of the distribution board The power value calculation unit 7 calculates a power value from the reference current waveform and the current waveform of the distribution board, and the output unit 8 outputs the calculated power value. The configuration other than the first measurement unit 1 and the second measurement unit 6 is not necessarily provided near the distribution board 21 and may be provided in a server connected to the network. In the configuration shown in FIG. 1, only one electrical product 20 is shown, but a plurality of electrical products 20 may be connected.
第1の測定部1は、動作電力推定対象の電気製品20の電流波形を測定する。第1の測定部1は、1つの電気製品20に接続され、その電気製品20の基準電流波形を算出することができる。蓄積部2は、第1の測定部1で測定した電気製品ごとの複数の電流波形を蓄積する。本実施形態では、動作電力推定対象の電気製品がM個あり、それぞれの電気製品についてN回の電流波形測定を行うものとする。そのm番目の電気製品のn番目の電流波形をIm、n(t)で表し、tは区間[0、T]で1周期の電流波形となるものとする。 The first measuring unit 1 measures the current waveform of the electrical product 20 that is the target of operating power estimation. The first measuring unit 1 is connected to one electrical product 20 and can calculate a reference current waveform of the electrical product 20. The accumulation unit 2 accumulates a plurality of current waveforms for each electrical product measured by the first measurement unit 1. In the present embodiment, it is assumed that there are M electrical products for which the operating power is to be estimated, and that N current waveforms are measured for each electrical product. The nth current waveform of the mth electrical product is represented by I m, n (t), and t is a one-cycle current waveform in the interval [0, T].
図2は、電気製品1、2における電力値と測定電流の時間変動を示す図である。図2(a)、(c)は、電気製品1と電気製品2とにおける電力値の分単位で2〜3時間程度の周期の時間変動をそれぞれ示している。どちらの機器でも電力値が連続に変動していることが読み取れる。図2(b)、(d)は、それぞれの電気製品において商用電源の一周期程度の短い適当な時間の周期T=20msで電流波形を測定したものを、重ねあわせてプロットしたものである。図2(b)、(d)は、Im、n(t)に相当し、適当な時間間隔Tの電流波形が示されている。図2(b)、(d)から、適当な時間周期で振幅が繰り返される電流波形の形状は一定していないことが読み取れる。 FIG. 2 is a diagram illustrating temporal fluctuations of the power value and the measurement current in the electrical products 1 and 2. FIGS. 2A and 2C respectively show temporal fluctuations of a period of about 2 to 3 hours in units of electric power values in the electric product 1 and the electric product 2. It can be seen that the power value fluctuates continuously in both devices. 2 (b) and 2 (d) are graphs in which current waveforms are measured and superimposed on each electric product at a period T = 20 ms that is as short as one cycle of a commercial power supply. FIGS. 2B and 2D correspond to I m, n (t), and current waveforms at appropriate time intervals T are shown. 2 (b) and 2 (d), it can be seen that the shape of the current waveform whose amplitude is repeated at an appropriate time period is not constant.
本実施形態では、図2に示すように、電力値および測定電流の時間変動を考慮した基準電流波形を算出し、算出された基準電流波形を用いて電気製品の動作電力値の推定を行うことにより、電流波形形状に連続変動のある電気製品が含まれる場合であっても、各電気製品の電力値推定を可能としている。   In the present embodiment, as shown in FIG. 2, a reference current waveform is calculated in consideration of the power value and the time variation of the measured current, and the operating power value of the electrical product is estimated using the calculated reference current waveform. Thus, even when an electrical product having a continuous variation in the current waveform shape is included, the power value of each electrical product can be estimated.
規格化部3は、分電盤配下の各電気製品について、それぞれの電流波形Im、n(t)を規格化した規格化電流波形Qm、n(t)を算出する。規格化の係数は、電流波形Im、n(t)の一次ノルムを用いる。すなわち、m番目の電気製品のn番目の規格化電流波形Qm、n(t)は、下記の(式1)に基づいて算出できる。 The normalization unit 3 calculates a normalized current waveform Q m, n (t) obtained by normalizing each current waveform I m, n (t) for each electric product under the distribution board. The normalization coefficient uses the first norm of the current waveform I m, n (t). That is, the n-th normalized current waveform Q m, n (t) of the m-th electrical product can be calculated based on (Equation 1) below.
基準電流波形算出部4は、規格化電流波形Qm、n(t)を用いて基準電流波形Qm(t)を算出する。基準電流波形Qm(t)の算出は、まず、規格化電流波形Qm、n(t)の各tについて、最大値を取る関数 The reference current waveform calculation unit 4 calculates the reference current waveform Qm (t) using the normalized current waveform Q m, n (t). The calculation of the reference current waveform Qm (t) is first performed by a function that takes the maximum value for each t of the normalized current waveform Q m, n (t).
と、最小値を取る関数 And the function that takes the minimum value
とを用意する。これらの関数を用い、下記の(式2)に基づいて基準電流波形Qm(t)を算出する。 And prepare. Using these functions, a reference current waveform Qm (t) is calculated based on (Equation 2) below.
このように、基準電流波形Qm(t)は、電力値および測定電流の時間変動を考慮して算出することができる。   Thus, the reference current waveform Qm (t) can be calculated in consideration of the power value and the time variation of the measured current.
図3は、電気製品1、2の規格化電流波形Qm、n(t)および基準電流波形Qm(t)を示す図である。図3(a)、(c)は、電気製品1と電気製品2との規格化電流波形Qm、n(t)を重ねあわせてプロットしたものであり、図2(b)、(d)に示された電気製品1と電気製品2との電流波形Im、n(t)を規格化したものである。 FIG. 3 is a diagram illustrating the normalized current waveforms Q m, n (t) and the reference current waveform Qm (t) of the electrical products 1 and 2. FIGS. 3A and 3C are plots of the normalized current waveforms Q m, n (t) of the electrical product 1 and the electrical product 2 superimposed on each other, and FIGS. The current waveforms I m, n (t) between the electric product 1 and the electric product 2 shown in FIG.
図3(b)、(d)は、それぞれの電気製品の基準電流波形Qm(t)をプロットしたものである。基準電流波形Qm(t)は、図3(a)、(c)に示した、重ね合わされた規格化電流波形Qm、n(t)のうち、最も振幅を小さくする点を結んだ波形となっている。なお、規格化は、基準電流波形Qm(t)の算出を容易にするためのものであり、必須の構成ではない。 3B and 3D are plots of the reference current waveform Qm (t) of each electric product. The reference current waveform Qm (t) is a waveform connecting the points with the smallest amplitude among the superimposed normalized current waveforms Q m, n (t) shown in FIGS. 3 (a) and 3 (c). It has become. The normalization is for facilitating the calculation of the reference current waveform Qm (t) and is not an essential configuration.
第1の測定部1と、蓄積部2と、規格化部3と、基準電流波形算出部4とは、初期設定部11として構成され、初期設定時に電気製品の電流波形を測定するとき以外は動作電力値推定装置10本体から取り外すことができるように構成してよい。   The first measuring unit 1, the accumulating unit 2, the normalizing unit 3, and the reference current waveform calculating unit 4 are configured as an initial setting unit 11, except when measuring the current waveform of the electrical product at the initial setting. You may comprise so that it can remove from the operating power value estimation apparatus 10 main body.
データベース部5は、各電気製品について電力値および測定電流の時間変動を考慮して算出した基準電流波形Qm(t)を保存する。   The database unit 5 stores a reference current waveform Qm (t) calculated in consideration of the power value and the time variation of the measured current for each electric product.
分電盤電流測定部6は、分電盤21における電流波形P(t)を測定する。   The distribution board current measuring unit 6 measures a current waveform P (t) in the distribution board 21.
電力値算出部7は、データベース部5に保存されている、電力値および測定電流の時間変動を考慮して算出された基準電流波形Qm(t)を用い、分電盤で測定された電流波形P(t)にフィッティングして電気製品の動作電力値の推定を行う。   The power value calculation unit 7 uses the reference current waveform Qm (t) that is stored in the database unit 5 and is calculated in consideration of the time variation of the power value and the measurement current, and the current waveform measured by the distribution board The operating power value of the electrical product is estimated by fitting to P (t).
ここでまず、分電盤で測定された電流波形P(t)へのフィッティングを説明する前に、本手法によるフィッティングを説明するため、単一の電気製品についてのフィッティングによる動作電力値の推定を説明する。図4は、電気製品1のみの電流波形に対してフィッティングを実行した例を示したものである。図4(a)は電気製品1の電力値の分単位での時間変動を示し、(b)は(a)の一部分の拡大を示したものである。部分拡大したもののうち、3点をピックアップし、その瞬間における電気製品1の基準電流波形Qm(t)をフィッティングした様子を図4(c)、(d)、(e)に示している。   First, before explaining the fitting to the current waveform P (t) measured by the distribution board, in order to explain the fitting by this method, the estimation of the operating power value by fitting for a single electric product is performed. explain. FIG. 4 shows an example in which fitting is performed on the current waveform of only the electric product 1. FIG. 4A shows the time fluctuation of the electric power value of the electric product 1 in units of minutes, and FIG. 4B shows an enlargement of a part of FIG. FIG. 4C, FIG. 4D, and FIG. 4E show how three points are picked up and the reference current waveform Qm (t) of the electric product 1 at that moment is fitted.
図4(c)、(d)、(e)において、実線で示したものが電気製品1の各時点における測定された電流波形であり、点線で示したものがフィッティングした波形である。フィッティングは、電気製品1の測定した電流波形に基準電流波形Qm(t)が内接するようにおこなう。ピックアップした3点において実際に測定した値はそれぞれ、409W、274W、157Wであるのに対し、電力推定した値はそれぞれ、421W、279W、160Wであった。電力推定した値は、基準電流波形Qm(t)を用いて求めた電力値である。電気製品1の実際の電流波形形状は、3点において互いに異なるにもかかわらず、極めてよい精度で電力値推定が実現されていることが判る。この3点における電力値推定の最大誤差は約3%であった。   4C, 4D, and 4E, the solid line indicates the current waveform measured at each time point of the electrical product 1, and the dotted line indicates the fitted waveform. The fitting is performed such that the reference current waveform Qm (t) is inscribed in the measured current waveform of the electrical product 1. The actually measured values at the three picked up points were 409 W, 274 W, and 157 W, respectively, while the estimated power values were 421 W, 279 W, and 160 W, respectively. The estimated power value is a power value obtained using the reference current waveform Qm (t). Although the actual current waveform shape of the electrical product 1 is different from each other at three points, it can be seen that the power value estimation is realized with extremely good accuracy. The maximum error in power value estimation at these three points was about 3%.
次に、分電盤で測定された電流波形P(t)に対するフィッティングによる動作電力値の推定について説明する。まず、基準電流波形Qm(t)を用いた推定電力値の算出について説明する。基準電流波形Qm(t)を用いて、下記の(式3)により電力値換算用の係数Rmを算出する。   Next, the estimation of the operating power value by fitting to the current waveform P (t) measured by the distribution board will be described. First, calculation of the estimated power value using the reference current waveform Qm (t) will be described. Using the reference current waveform Qm (t), a power value conversion coefficient Rm is calculated by the following (Equation 3).
ここで、m番目の電気製品の電力値係数をamとし、さらに下記(式4)に示す補助関数を導入する。 Here, the power value coefficient of the m-th electric appliances and a m, further introducing an auxiliary function shown below (Equation 4).
分電盤電流波形へのフィッティングは、以下の条件式   The fitting to the distribution board current waveform is based on the following conditional expression
を、任意のmと任意のにおいて満たす条件の元に、 With any m and any condition
を満たす電力値係数をamを算出することによって行う。数値計算は、制約条件付き最小二乗法等を用いればよい。算出されたamを用い、m番目の電気製品の電力値をamRmと算出する。 The power value coefficient satisfying the above condition is calculated by calculating am. For the numerical calculation, a least square method with constraints may be used. Using the calculated a m, the power value of the m-th electrical products is calculated with a m Rm.
出力部8は、電力値算出部7で算出された電気製品の電力値を出力する。   The output unit 8 outputs the power value of the electrical product calculated by the power value calculation unit 7.
図5は、分電盤で測定した電流波形である電気製品1と電気製品2との電流波形の合成波形に対するフィッティングの様子を示したものである。図5(a)は、電気製品1、2の電流波形の波形形状を示したものであり、図5(b)は、分電盤で測定された電流波形P(t)を実線で示し、電気製品1、2の基準電流波形Qm(t)を波形を合成してフィッティングしたものを点線で示している。フィッティングは、2つの基準電流波形Qm(t)を基底としてこれら2つの基底を一次結合した波形を分電盤で測定された電流波形に内接させることにより行う。図5(b)の実線は電気製品1、2の電流波形を合成したものに等しい。図5(b)の点線は、上記フィッティング計算によって算出されたamを用いて、 FIG. 5 shows a fitting state with respect to a composite waveform of the current waveforms of the electric product 1 and the electric product 2 which are current waveforms measured by the distribution board. FIG. 5A shows the waveform shape of the current waveforms of the electrical products 1 and 2, and FIG. 5B shows the current waveform P (t) measured by the distribution board as a solid line. The dotted lines indicate the fitting of the reference current waveforms Qm (t) of the electrical products 1 and 2 by combining the waveforms. Fitting is performed by inscribing a waveform obtained by linearly coupling these two bases with the two reference current waveforms Qm (t) as the bases to the current waveform measured by the distribution board. The solid line in FIG. 5B is equal to the synthesized current waveform of the electrical products 1 and 2. The dotted line in FIG. 5 (b), using a m calculated by the fitting calculation,
をプロットしたものに等しい。また、この時の電気製品1、2の電力値は、実際の値が245W、52Wであるのに対し、推定した値は249W、53Wであった。このように、分電盤で測定される合成電流波形においても、極めて良い精度で電力値推定が実現されていることが判る。この事例における誤差は約2%である。   Is equivalent to the plot. In addition, the actual power values of the electrical products 1 and 2 at this time were 245 W and 52 W, whereas the estimated values were 249 W and 53 W. Thus, it can be seen that the power value estimation is realized with very good accuracy even in the combined current waveform measured by the distribution board. The error in this case is about 2%.
以上説明したように本実施形態の動作電力値推定装置によれば、電流波形形状に連続変動のある電気製品が含まれる場合であっても、各電気製品の電力値推定ができる。   As described above, according to the operating power value estimation apparatus of the present embodiment, the power value of each electrical product can be estimated even when an electrical product having a continuous variation in the current waveform shape is included.
本実施形態では、規格化の係数として電流波形Im、n(t)の一次ノルムを用いていたが、これに代えて、電流波形Im、n(t)に電圧波形V(t)を掛けあわせたものを規格化の係数として用いてもよい。すなわち、m番目の電気製品のn番目の規格化電流波形Qm、n(t)を、 In the present embodiment, the primary norm of the current waveform I m, n (t) is used as a normalization coefficient. Instead, the voltage waveform V (t) is used as the current waveform I m, n (t). You may use what was multiplied as a coefficient of normalization. That is, the n-th normalized current waveform Q m, n (t) of the m-th electrical product is
として算出してもよい。この場合、電力値換算用の係数Rmは、Rm=1として算出する。すなわち、任意のmと任意のtにおいて満たす条件の元に、   May be calculated as In this case, the power value conversion coefficient Rm is calculated as Rm = 1. That is, under the condition that is satisfied at an arbitrary m and an arbitrary t,
を満たす電力係数amがm番目の電気製品の電力値として算出される。 Power coefficient a m satisfying is calculated as the power value of the m-th electrical products.
(第2の実施形態)
図6は分電盤に取り付けた第2の実施形態の動作電力値推定装置の概略構成を示す図である。本実施形態の動作電力値推定装置12では、第2の測定部6が電気製品の電流波形を測定する第1の測定部1の機能を兼ねている点で第1の実施形態の動作電力値推定装置10と構成が異なる。ここでは、第1の実施形態と異なる構成のみ説明することとし、第1の実施形態と同様の構成はその説明を省略する。
(Second Embodiment)
FIG. 6 is a diagram showing a schematic configuration of an operating power value estimation apparatus according to the second embodiment attached to a distribution board. In the operating power value estimation apparatus 12 of the present embodiment, the operating power value of the first embodiment is that the second measuring unit 6 also functions as the first measuring unit 1 that measures the current waveform of the electrical product. The configuration is different from that of the estimation device 10. Here, only the configuration different from the first embodiment will be described, and the description of the same configuration as the first embodiment will be omitted.
動作電力値推定装置12は、初期設定時に分電盤21に接続された第2の測定部6を用いて個々の電気製品の電流波形を測定する。測定した電流波形は蓄積部2に蓄積される。第2の実施形態では、分電盤21に接続されている複数の電気製品20のうち、対象となる1つの電気製品20のみを動作させて、動作電力値推定装置12が、電流波形の測定および基準電流波形の算出、データベース部5への保存を行う。   The operating power value estimation device 12 measures the current waveform of each electric product using the second measuring unit 6 connected to the distribution board 21 at the time of initial setting. The measured current waveform is stored in the storage unit 2. In the second embodiment, among the plurality of electrical products 20 connected to the distribution board 21, only one target electrical product 20 is operated, and the operating power value estimation device 12 measures the current waveform. The reference current waveform is calculated and stored in the database unit 5.
この実施形態の動作電力値推定装置によれば、より簡易な構成で第1の実施形態と同様に電流波形形状に連続変動のある電気製品が含まれる場合であっても、各電気製品の電力値推定ができる。   According to the operating power value estimation device of this embodiment, even when an electrical product having a continuous variation is included in the current waveform shape as in the first embodiment with a simpler configuration, the power of each electrical product is Value estimation is possible.
1 第1の測定部
2 蓄積部
3 規格化部
4 基準電流波形算出部
5 データベース部
6 第2の測定部
7 電力値算出部
8 出力部
10、12 動作電力値推定装置
20 電気製品
22 電力線
21 分電盤
DESCRIPTION OF SYMBOLS 1 1st measurement part 2 Accumulation part 3 Normalization part 4 Reference | standard current waveform calculation part 5 Database part 6 2nd measurement part 7 Power value calculation part 8 Output part 10, 12 Operating power value estimation apparatus 20 Electrical product 22 Power line 21 Distribution board

Claims (6)

  1. 分電盤における電流波形から、その配下にある1または2以上の電気製品における動作電力値を推定する動作電力推定装置であって、
    前記分電盤の配下の1または2以上の電気製品のぞれぞれについて、所定の時間周期ごとの電流波形をあらかじめ複数回測定する第1の測定手段と、
    前記1または2以上の電気製品について、前記測定された複数の電流波形のうちで最も振幅を小さくする点を結んだ波形である基準電流波形を算出する基準電流波形算出手段と、
    前記分電盤における電流波形を測定する第2の測定手段と、
    前記1または2以上の電気製品の前記基準電流波形を複数の基底として、該複数の基底による一次結合が前記測定した分電盤における電流波形に内接するようにフィッティングすることにより、前記各電気製品の動作電力値を推定する推定手段とを備えたことを特徴とする動作電力値推定装置。
    An operating power estimation device that estimates an operating power value of one or more electrical products under its control from a current waveform in a distribution board,
    First measuring means for measuring a current waveform for each predetermined time period a plurality of times in advance for each of one or more electrical products under the distribution board;
    A reference current waveform calculating means for calculating a reference current waveform, which is a waveform connecting the points with the smallest amplitude among the plurality of measured current waveforms for the one or more electrical products;
    A second measuring means for measuring a current waveform in the distribution board;
    By fitting the reference current waveforms of the one or more electrical products as a plurality of bases so that the primary coupling by the plurality of bases is inscribed in the measured current waveform in the distribution board, each of the electrical products An operating power value estimation apparatus comprising: estimation means for estimating the operating power value of
  2. 前記基準電流波形算出手段は、前記第1の測定手段で測定された複数の電流波形の振幅を、電流波形の一次ノルムで割ることによって規格化した複数の電流波形のうちで最も振幅を小さくする点を結んだ波形である基準電流波形を算出することを特徴とする請求項1記載の動作電力値推定装置。   The reference current waveform calculation means makes the amplitude the smallest among the plurality of current waveforms normalized by dividing the amplitude of the plurality of current waveforms measured by the first measurement means by the primary norm of the current waveform. 2. The operating power value estimation apparatus according to claim 1, wherein a reference current waveform which is a waveform connecting points is calculated.
  3. 前記基準電流波形算出手段は、前記第1の測定手段で測定された複数の電流波形の振幅を、電流波形に電圧波形を掛けあわせたもので割ることによって規格化した複数の電流波形のうちで最も振幅を小さくする点を結んだ波形である基準電流波形を算出することを特徴とする請求項1記載の動作電力値推定装置。   The reference current waveform calculation means includes a plurality of current waveforms normalized by dividing the amplitude of the plurality of current waveforms measured by the first measurement means by the current waveform multiplied by the voltage waveform. 2. The operating power value estimation apparatus according to claim 1, wherein a reference current waveform which is a waveform connecting points with the smallest amplitude is calculated.
  4. 分電盤における電流波形から、その配下にある1または2以上の電気製品における動作電力値を推定する動作電力推定方法であって、
    前記分電盤の配下の1または2以上の電気製品のぞれぞれについて、所定の時間周期ごとの電流波形をあらかじめ複数回測定する第1の測定ステップと、
    前記1または2以上の電気製品について、前記測定された複数の電流波形のうちで最も振幅を小さくする点を結んだ波形である基準電流波形を算出する基準電流波形算出ステップと、
    前記分電盤における電流波形を測定する第2の測定ステップと、
    前記1または2以上の電気製品の前記基準電流波形を複数の基底として、該複数の基底による一次結合が前記測定した分電盤における電流波形に内接するようにフィッティングすることにより、前記各電気製品の動作電力値を推定する推定ステップとを含むことを特徴とする動作電力値推定方法。
    An operating power estimation method for estimating an operating power value in one or more electrical products under its control from a current waveform in a distribution board,
    A first measurement step of measuring a current waveform for each predetermined time period a plurality of times in advance for each of one or more electrical products under the distribution board;
    A reference current waveform calculation step of calculating a reference current waveform that is a waveform connecting points of the smallest amplitude among the measured current waveforms for the one or more electrical products;
    A second measuring step for measuring a current waveform in the distribution board;
    By fitting the reference current waveforms of the one or more electrical products as a plurality of bases so that the primary coupling by the plurality of bases is inscribed in the measured current waveform in the distribution board, each of the electrical products And an estimation step of estimating the operating power value of the operating power value.
  5. 前記基準電流波形算出ステップは、前記第1の測定ステップで測定された複数の電流波形の振幅を、電流波形の一次ノルムで割ることによって規格化した複数の電流波形のうちで最も振幅を小さくする点を結んだ波形である基準電流波形を算出することを特徴とする請求項4記載の動作電力値推定方法。   In the reference current waveform calculation step, the amplitude of the plurality of current waveforms measured in the first measurement step is minimized by dividing the amplitude of the plurality of current waveforms by the primary norm of the current waveform. 5. The operating power value estimation method according to claim 4, wherein a reference current waveform which is a waveform connecting points is calculated.
  6. 前記基準電流波形算出ステップは、前記第1の測定ステップで測定された複数の電流波形の振幅を、電流波形に電圧波形を掛けあわせたもので割ることによって規格化した複数の電流波形のうちで最も振幅を小さくする点を結んだ波形である基準電流波形を算出することを特徴とする請求項4記載の動作電力値推定方法。   In the reference current waveform calculation step, among the plurality of current waveforms normalized by dividing the amplitude of the plurality of current waveforms measured in the first measurement step by the current waveform multiplied by the voltage waveform. 5. The operating power value estimation method according to claim 4, wherein a reference current waveform which is a waveform connecting points with the smallest amplitude is calculated.
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