JP5238358B2 - AC power measuring device, AC power measuring method, and single-phase AC / DC converter - Google Patents
AC power measuring device, AC power measuring method, and single-phase AC / DC converter Download PDFInfo
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Description
本発明は、交流の有効電力及び無効電力を測定する交流電力測定装置に関する。 The present invention relates to an AC power measuring apparatus that measures AC active power and reactive power.
従来、単相交流電力の測定では図9のように電圧検出回路31と電流検出回路34とがそれぞれ測定した電力測定点の電圧と電流との積をローパスフィルタ149−1に通して有効電力値測定回路145で有効電力値を測定していた。また、電力測定点の電流位相を電流位相遅延回路143で90度ずらした関数を生成し、この関数と電力測定点の電圧との積をローパスフィルタ149−2に通して無効電力値測定回路146で無効電力値を測定していた(例えば、特許文献1を参照。)。
従来の電力測定方法は、電力測定点の電圧と電流との積及び前記関数と電力測定点の電圧との積には皮相電力の大きさの振幅を持ち、電力測定点の周波数の2倍の周波数をもつ交流成分(以下、「電力測定点の周波数の2倍の周波数をもつ交流成分」を「2倍周波数成分」と記載する。)が含まれることになる。2倍周波数成分を除去するためには、ローパスフィルタの時定数を長くする必要があった。しかし、ローパスフィルタの時定数を長くすれば、有効電力と無効電力の時間応答が遅くなり、瞬時値との乖離が大きくなるため、電力測定の応答性および精度に課題があった。 In the conventional power measurement method, the product of the voltage and the current at the power measurement point and the product of the function and the voltage at the power measurement point have an amplitude of the magnitude of the apparent power, which is twice the frequency of the power measurement point. An AC component having a frequency (hereinafter, “AC component having a frequency twice the frequency of the power measurement point” will be referred to as “double frequency component”) will be included. In order to remove the double frequency component, it was necessary to lengthen the time constant of the low-pass filter. However, if the time constant of the low-pass filter is lengthened, the time response between the active power and the reactive power is delayed, and the deviation from the instantaneous value is increased, so that there is a problem in the response and accuracy of power measurement.
そこで、本発明は、2倍周波数成分を低減でき、電力測定精度の高い交流電力測定装置を提供することを目的とする。 Therefore, an object of the present invention is to provide an AC power measuring device that can reduce a double frequency component and has high power measurement accuracy.
上記目的を達成するため、本発明は、電力測定点の測定交流電圧及び測定交流電流、並びにこれらの位相を遅らせた遅延交流電圧及び遅延交流電流から有効電力値及び無効電力値を計算することとした。 In order to achieve the above-mentioned object, the present invention calculates an active power value and a reactive power value from a measured AC voltage and a measured AC current at a power measurement point, and a delayed AC voltage and a delayed AC current whose phases are delayed. did.
具体的には、本発明に係る交流電力測定装置は、規準周波数を生成する規準周波数回路と、前記規準周波数回路からの前記規準周波数に基づいて、電力測定点の交流電圧である測定交流電圧の位相を遅らせて遅延交流電圧を生成する電圧位相遅延回路と、前記規準周波数回路からの前記規準周波数に基づいて、電力測定点の交流電流である測定交流電流の位相を遅らせて遅延交流電流を生成する電流位相遅延回路と、前記測定交流電圧と前記測定交流電流との乗算値に前記遅延交流電圧と前記遅延交流電流との乗算値を加算した加算値を有効電力値とし、前記測定交流電流と前記遅延交流電圧との乗算値から前記測定交流電圧と前記遅延交流電流との乗算値を減算した減算値を無効電力値とする電力演算回路と、を備える。 Specifically, the AC power measurement device according to the present invention includes a reference frequency circuit that generates a reference frequency, and a measurement AC voltage that is an AC voltage at a power measurement point based on the reference frequency from the reference frequency circuit. A delayed AC current is generated by delaying the phase of the measured AC current, which is the AC current at the power measurement point, based on the reference frequency from the reference frequency circuit and a voltage phase delay circuit that generates a delayed AC voltage by delaying the phase. A current phase delay circuit, an addition value obtained by adding a multiplication value of the delayed AC voltage and the delayed AC current to a multiplication value of the measurement AC voltage and the measurement AC current, and an active power value, A power calculation circuit having a reactive power value as a subtraction value obtained by subtracting a multiplication value of the measurement AC voltage and the delay AC current from a multiplication value of the delay AC voltage.
測定交流電圧と測定交流電流との乗算値に遅延交流電圧と遅延交流電流との乗算値を加算することで、有効電力値に含まれる2倍周波数成分を低減することができる。また、測定交流電流と遅延交流電圧との乗算値から測定交流電圧と遅延交流電流との乗算値を減算することで、無効電力値に含まれる2倍周波数成分を低減することができる。本発明に係る交流電力測定装置が行う有効電力値及び無効電力値の計算について以下に説明する。 By adding the multiplied value of the delayed AC voltage and the delayed AC current to the multiplied value of the measured AC voltage and the measured AC current, the double frequency component included in the active power value can be reduced. Further, the double frequency component included in the reactive power value can be reduced by subtracting the multiplication value of the measurement AC voltage and the delay AC current from the multiplication value of the measurement AC current and the delay AC voltage. The calculation of the active power value and the reactive power value performed by the AC power measuring apparatus according to the present invention will be described below.
電力測定点の交流電圧である測定交流電圧Vs(t)とこれより位相がφ[rad]遅れる電力測定点の交流電流である測定交流電流Is(t)は数式(1)で表される。
ここで、測定交流電圧Vs(t)と測定交流電流Is(t)の位相をπ/(2ωco)だけ遅らせた遅延交流電圧V”s(t)と遅延交流電流I”s(t)は数式(2)で表される。
次に数式(3)のような計算値PPP(t)と計算値QQQ(t)を考える。これらの計算値は、任意の時刻tに対して定まる値(瞬時値)である。
まず、計算値PPP(t)を求める。数式(3)に数式(1)及び数式(2)を代入して整理すると、数式(4)が得られる。
次に、計算値QQQ(t)を求める。数式(3)に数式(1)及び数式(2)を代入して整理すると、数式(5)が得られる。
従って、本発明に係る交流電力測定装置は、2倍周波数成分を低減でき、電力測定精度を高くすることができる。 Therefore, the AC power measurement apparatus according to the present invention can reduce the double frequency component and increase the power measurement accuracy.
本発明に係る交流電力測定装置の有効電力の電力演算回路は、前記加算値をローパスフィルタに通して前記有効電力値とすることが好ましい。数式(4)に含まれる2倍周波数成分をさらに低減でき、有効電力測定の精度をさらに向上することができる。また,無効電力の電力演算回路でも、前記減算値をローパスフィルタに通して前記無効電力値とすることができる。 The active power calculation circuit of the AC power measuring apparatus according to the present invention preferably passes the added value through a low-pass filter to obtain the active power value. The double frequency component included in Equation (4) can be further reduced, and the accuracy of active power measurement can be further improved. In the reactive power power calculation circuit, the subtraction value can be passed through a low-pass filter to obtain the reactive power value.
本発明に係る交流電力測定装置の前記規準周波数回路は、前記規準周波数と前記電力測定点の交流の周波数とをPLL等によって同期させていることが望ましいが、等しくなくてもよい。角周波数ωsと規準角周波数ωcoとを一致させれば、数式(2)に示すようにψ=0となる。従って、VsIssinψは0となり、数式(4)の計算値PPP(t)は有効電力値に等しくなる。一方、cosψは1となり、数式(5)の計算値QQQ(t)は無効電力値に等しくなるため、有効電力値及び無効電力値の測定精度がさらに向上する。 The reference frequency circuit of the AC power measuring apparatus according to the present invention desirably synchronizes the reference frequency and the AC frequency at the power measurement point by a PLL or the like, but it may not be equal. If the angular frequency ω s and the reference angular frequency ω co are matched, ψ = 0 as shown in Equation (2). Therefore, V s I s sin ψ is 0, and the calculated value PPP (t) in Equation (4) is equal to the active power value. On the other hand, cos ψ is 1, and the calculated value QQQ (t) of Expression (5) is equal to the reactive power value, so that the measurement accuracy of the active power value and the reactive power value is further improved.
本発明は、2倍周波数成分を低減でき、電力測定精度の高い交流電力測定装置を提供することができる。 The present invention can provide an AC power measuring device that can reduce double frequency components and has high power measurement accuracy.
以下、本発明の実施形態について、図面を参照しながら詳細に説明する。なお、本発明は、以下に示す実施形態に限定されるものではない。なお、本明細書及び図面において符号が同じ構成要素は、相互に同一のものを示すものとする。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to embodiment shown below. In the present specification and drawings, the same reference numerals denote the same components.
図1及び図2に、本実施形態の交流電力測定装置の概略構成図を示す。図1及び図2の交流電力測定装置140には、交流の電力測定点において電圧検出回路31が検出した交流電圧値及び電流検出回路34が検出した交流電流値が入力される。なお、電流検出回路34は、変流器38を介して交流の電力測定点の交流電流を検出する。
In FIG.1 and FIG.2, the schematic block diagram of the alternating current power measuring apparatus of this embodiment is shown. The AC
交流電力測定装置140は、規準周波数を生成する規準周波数回路141と、規準周波数回路141からの規準周波数に基づいて、電力測定点の交流電圧である測定交流電圧の位相を遅らせて遅延交流電圧を生成する電圧位相遅延回路142と、規準周波数回路141からの規準周波数に基づいて、電力測定点の交流電流である測定交流電流の位相を遅らせて遅延交流電流を生成する電流位相遅延回路143と、測定交流電圧と測定交流電流との乗算値に電圧位相遅延回路142からの遅延交流電圧と電流位相遅延回路143からの遅延交流電流との乗算値を加算した加算値を有効電力値とし、測定交流電流と電圧位相遅延回路142からの遅延交流電圧との乗算値から測定交流電圧と電流位相遅延回路143からの遅延交流電流との乗算値を減算した減算値を無効電力値とする電力演算回路144と、を備える。
The AC
図2は図1の電力演算回路144内の接続を説明する図である。電力演算回路144は、測定交流電圧と測定交流電流とを乗算する乗算器147−1、遅延交流電圧と遅延交流電流とを乗算する乗算器147−2、測定交流電圧と遅延交流電流とを乗算する乗算器147−3、測定交流電流と遅延交流電圧とを乗算する乗算器147−4を有する。さらに、電力演算回路144は、乗算器147−1の出力と乗算器147−2の出力とを加算する加算器148−1、乗算器147−4の出力から乗算器147−3の出力を減算する減算器148−2を有する。電力演算回路144は、加算器148−1の出力を有効電力値測定回路145に入力して有効電力値を測定し、減算器148−2の出力を無効電力値測定回路146に入力して無効電力値を測定する。
FIG. 2 is a diagram for explaining connections in the
図3に電圧位相遅延回路142の一例を示す。電流位相遅延回路143も同様である。電圧位相遅延回路142は、入力信号f(t)を数式(6)のように遅延させた出力信号f”(t)を出力する。
電力演算回路144は、加算器148−1から出力される加算値をローパスフィルタ149−1に通して有効電力値測定回路145に入力してもよい。また、電力演算回路144は、減算器148−2から出力される減算値をローパスフィルタ149−2に通して無効電力値測定回路146に入力してもよい。
The
(シミュレーション結果)
従来の交流電力測定装置での測定と図2の交流電力測定装置での測定についてシミュレーションを行った。シミュレーションを行った回路を図4に示す。単相交流電源240に負荷としてインダクタンス127.3mHのインダクタLoと抵抗値100Ωの抵抗Roとを直列に接続した。単相交流電源240は、電力測定点の測定交流電圧に相当する。単相交流電源240の出力電圧Vsは141sin(100πt)とした。
(simulation result)
A simulation was performed for the measurement with the conventional AC power measurement device and the measurement with the AC power measurement device of FIG. FIG. 4 shows the circuit on which the simulation was performed. An inductor Lo having an inductance of 127.3 mH and a resistor Ro having a resistance value of 100Ω were connected in series to the single-phase
インダクタLoと抵抗Roに流れる交流電流iは数式(7)のようになる。
従来の交流電力測定装置で測定した場合の有効電力値Pと無効電力値Qの瞬時値のシミュレーション波形を図5に示す。さらに、これのFFT結果を図6に示す。また、図2の交流電力測定装置で測定した場合の有効電力値Pと無効電力値Qの瞬時値のシミュレーション波形を図7に示す。さらに、これのFFT結果を図8に示す。 FIG. 5 shows simulation waveforms of instantaneous values of the active power value P and the reactive power value Q when measured with a conventional AC power measuring device. Furthermore, the FFT result of this is shown in FIG. FIG. 7 shows simulation waveforms of instantaneous values of the active power value P and the reactive power value Q when measured by the AC power measuring device of FIG. Furthermore, the FFT result of this is shown in FIG.
図5から図8のデータを比較すると、従来の交流電力測定装置で測定した場合、有効電力値Pと無効電力値Qの瞬時値が100Hzの交流となり、大きな振幅の2倍周波数成分が含まれる。一方、図2の交流電力測定装置で測定した場合、有効電力値Pと無効電力値Qの瞬時値が直流となり、2倍周波数成分が含まれない。 Comparing the data of FIG. 5 to FIG. 8, when measured with a conventional AC power measuring device, the instantaneous value of the active power value P and the reactive power value Q is 100 Hz AC, and includes a double frequency component with a large amplitude. . On the other hand, when measured with the AC power measurement device of FIG. 2, the instantaneous value of the active power value P and the reactive power value Q becomes a direct current and does not include a double frequency component.
このように、図2の交流電力測定装置は、2倍周波数成分を低減できるため、従来の交流電力測定装置より電力測定精度や応答性を高くすることができる。 As described above, since the AC power measuring device of FIG. 2 can reduce the double frequency component, the power measurement accuracy and responsiveness can be made higher than those of the conventional AC power measuring device.
本発明の交流電力測定装置は、有効電力値及び無効電力値を独立して制御する単相電力測定器や自律並行運転制御単相交直変換装置に適用することができる。また、3台用いることで、三相の装置にも適用することができる。 The AC power measuring device of the present invention can be applied to a single-phase power measuring device and an autonomous parallel operation control single-phase AC / DC converter that independently control the active power value and the reactive power value. Moreover, by using three units, it can be applied to a three-phase apparatus.
31:電圧検出回路
34:電流検出回路
38:変流器
40:単相交流電源
140:交流電力測定装置
141:規準周波数回路
142:電圧位相遅延回路
143:電流位相遅延回路
144:電力演算回路
145:有効電力値測定回路
146:無効電力値測定回路
147−1、147−2、147−3、147−4:乗算器
148−1:加算器
148−2:減算器
240:単相交流電源
Lo:インダクタ
Ro:抵抗
31: Voltage detection circuit 34: Current detection circuit 38: Current transformer 40: Single phase AC power supply 140: AC power measuring device 141: Reference frequency circuit 142: Voltage phase delay circuit 143: Current phase delay circuit 144: Power calculation circuit 145 : Active power value measuring circuit 146: Reactive power value measuring circuit 147-1, 147-2, 147-3, 147-4: Multiplier 148-1: Adder 148-2: Subtractor 240: Single-phase AC power supply Lo : Inductor Ro: Resistance
Claims (8)
前記規準周波数回路からの前記規準周波数に基づいて、電力測定点の交流電圧である測定交流電圧の位相を遅らせて遅延交流電圧を生成する電圧位相遅延回路と、
前記規準周波数回路からの前記規準周波数に基づいて、電力測定点の交流電流である測定交流電流の位相を遅らせて遅延交流電流を生成する電流位相遅延回路と、
前記測定交流電圧と前記測定交流電流との乗算値に前記遅延交流電圧と前記遅延交流電流との乗算値を加算した加算値に1/2を乗算した値を有効電力値とし、前記測定交流電流と前記遅延交流電圧との乗算値から前記測定交流電圧と前記遅延交流電流との乗算値を減算した減算値に1/2を乗算した値を無効電力値とする電力演算回路と、
を備える交流電力測定装置。 A reference frequency circuit for generating a reference frequency;
Based on the reference frequency from the reference frequency circuit, a voltage phase delay circuit that generates a delayed AC voltage by delaying the phase of the measurement AC voltage that is an AC voltage at a power measurement point;
Based on the reference frequency from the reference frequency circuit, a current phase delay circuit that generates a delayed alternating current by delaying the phase of the measured alternating current that is an alternating current at a power measurement point;
A value obtained by multiplying a multiplication value of the measurement AC voltage and the measurement AC current by a multiplication value of the delay AC voltage and the delay AC current is multiplied by 1/2 to obtain an active power value, and the measurement AC current A power calculation circuit having a reactive power value obtained by multiplying a subtraction value obtained by subtracting a multiplication value of the measured AC voltage and the delayed AC current from a multiplication value of the delay AC voltage and the delay AC voltage;
AC power measuring device comprising:
前記測定交流電圧と前記測定交流電流とを乗算する第1の乗算器と、 A first multiplier that multiplies the measurement AC voltage and the measurement AC current;
前記遅延交流電圧と前記遅延交流電流とを乗算する第2の乗算器と、 A second multiplier for multiplying the delayed alternating voltage by the delayed alternating current;
前記測定交流電圧と前記遅延交流電流とを乗算する第3の乗算器と、 A third multiplier for multiplying the measured alternating voltage by the delayed alternating current;
前記測定交流電流と前記遅延交流電圧とを乗算する第4の乗算器と、 A fourth multiplier for multiplying the measured alternating current by the delayed alternating voltage;
前記第1の乗算器で乗算した前記測定交流電圧と前記測定交流電流との乗算値と前記第2の乗算器で乗算した前記遅延交流電圧と前記遅延交流電流との乗算値とを加算する第1の加算器と、 A multiplication value of the measured alternating voltage multiplied by the measured alternating current multiplied by the first multiplier and a multiplied value of the delayed alternating voltage multiplied by the delayed alternating current multiplied by the second multiplier are added. 1 adder,
前記第3の乗算器で乗算した前記測定交流電圧と前記遅延交流電流との乗算値と前記第4の乗算器で乗算した前記測定交流電流と前記遅延交流電圧との乗算値とを加算する第2の加算器と、 A multiplication value of the measured alternating current voltage multiplied by the delayed alternating current multiplied by the third multiplier and a multiplied value of the measured alternating current multiplied by the fourth multiplier multiplied by the delayed alternating voltage are added. Two adders;
を備える請求項1に記載の交流電力測定装置。The AC power measuring device according to claim 1, comprising:
前記電圧位相遅延回路及び前記電流位相遅延回路は、数2cで前記遅延交流電圧V”The voltage phase delay circuit and the current phase delay circuit have the delay AC voltage V ″ in Equation 2c. ss (t)と前記遅延交流電流I”(T) and the delayed alternating current I ″ ss (t)を生成し、(T)
とを特徴とする請求項1から3のいずれかに記載の交流電力測定装置。 Said power operation circuit, an AC power measurement apparatus according to any one of claims 1 to 3, characterized in that the said active power values through the addition value to the low-pass filter.
とを特徴とする請求項1から4のいずれかに記載の交流電力測定装置。 Said power operation circuit, an AC power measurement apparatus according to any one of claims 1 to 4, characterized in that the said reactive power values through the subtraction value to the low-pass filter.
ていることを特徴とする請求項1から5のいずれかに記載の交流電力測定装置。 The reference frequency circuit, an AC power measurement apparatus according to any one of claims 1 to 5, characterized in that it is synchronized with the frequency of the alternating current of the reference frequency and the power measuring point.
前記規準周波数に基づいて、電力測定点の交流電圧である測定交流電圧の位相を遅らせて遅延交流電圧を生成する工程と、 Based on the reference frequency, delaying the phase of the measurement AC voltage that is the AC voltage at the power measurement point to generate a delayed AC voltage;
前記規準周波数に基づいて、電力測定点の交流電流である測定交流電流の位相を遅らせて遅延交流電流を生成する工程と、 Based on the reference frequency, delaying the phase of the measurement AC current that is the AC current at the power measurement point to generate a delayed AC current;
前記測定交流電圧と前記測定交流電流との乗算値に前記遅延交流電圧と前記遅延交流電流との乗算値を加算した加算値に1/2を乗算した値を有効電力値として演算し、又は前記測定交流電流と前記遅延交流電圧との乗算値から前記測定交流電圧と前記遅延交流電流との乗算値を減算した減算値に1/2を乗算した値を無効電力値として演算する工程と、 A value obtained by multiplying a multiplication value of the measurement AC voltage and the measurement AC current by a multiplication value of the delay AC voltage and the delay AC current is multiplied by 1/2 as an active power value, or Calculating as a reactive power value a value obtained by multiplying a subtracted value obtained by subtracting a multiplied value of the measured AC voltage and the delayed AC current from a multiplied value of the measured AC current and the delayed AC voltage;
を備える交流電力測定方法。An AC power measuring method comprising:
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