JP3492124B2 - Frequency detector - Google Patents
Frequency detectorInfo
- Publication number
- JP3492124B2 JP3492124B2 JP32529196A JP32529196A JP3492124B2 JP 3492124 B2 JP3492124 B2 JP 3492124B2 JP 32529196 A JP32529196 A JP 32529196A JP 32529196 A JP32529196 A JP 32529196A JP 3492124 B2 JP3492124 B2 JP 3492124B2
- Authority
- JP
- Japan
- Prior art keywords
- phase
- voltage
- angular velocity
- frequency
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Measuring Frequencies, Analyzing Spectra (AREA)
- Inverter Devices (AREA)
- Measuring Phase Differences (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、交流電源に接続
される電力変換装置等で使用される周波数検出装置に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency detecting device used in a power converter connected to an AC power source.
【０００２】[0002]
【従来の技術】図９は例えば特公平４−５６５３６号公
報に示された従来の周波数検出装置を持つ電力変換装置
を本発明と同様の形式に書き改めた図であり、図におい
て、１は３相交流電源、６はサイリスタ整流器である。
サイリスタ整流器６は、例えば図１０に示すようにサイ
リスタのブリッジ接続されたものである。１１は３相交
流電源の電圧を検出する電圧センサ、３０はサイリスタ
整流器６を制御する制御回路である。３１はＣＰＵ、メ
モリ、Ａ／Ｄ変換回路などから構成されているコンピュ
ータ、３２はサイリスタに点弧パルスを与えるゲートロ
ジック、３３はフェーズロックループ（ＰＬＬ）回路が
用いられ３相交流電源１の周波数に同期した位相信号θ
を取りだす位相検出器、３４は計数器、３５は一定の発
振を行う発振器である。2. Description of the Related Art FIG. 9 is a diagram in which a power conversion device having a conventional frequency detection device disclosed in, for example, Japanese Patent Publication No. 4-56536 is rewritten in the same format as that of the present invention. A three-phase AC power supply, and 6 is a thyristor rectifier.
The thyristor rectifier 6 is, for example, a thyristor bridge-connected as shown in FIG. Reference numeral 11 is a voltage sensor for detecting the voltage of the three-phase AC power supply, and 30 is a control circuit for controlling the thyristor rectifier 6. Reference numeral 31 is a computer composed of a CPU, memory, A / D conversion circuit, etc., 32 is a gate logic for giving an ignition pulse to a thyristor, 33 is a frequency of the three-phase AC power supply 1 using a phase lock loop (PLL) circuit. Phase signal θ synchronized with
Is a phase detector, 34 is a counter, and 35 is an oscillator for performing constant oscillation.
【０００３】次に従来の周波数検出装置に関する説明を
中心に行う。位相検出器３３から３相交流電源１の周波
数に同期したサンプリングパルスＳＰＬＳがデジタル位
相信号θの一信号としてそこから取り出せる。計数器３
４はコンピュータ３１のリセット信号ＲＳＴにより初期
化を行い、計数値ＦＣＮＴを零にし、新たに発振器３５
の出力である一定発振パルスＰＵＬＳを計数する。コン
ピュータ３１はサンプリングパルスＳＰＬＳ毎に制御演
算を行い、サイリスタ整流器６を制御する信号Ｅｃをゲ
ートロジック３２に与える。また、例えば１２０回のサ
ンプリングパルスＳＰＬＳ毎に計数器３４の計数値ＦＣ
ＮＴを読み込み、計数器３４にリセット信号を出力す
る。ここで、サンプリングパルスＳＰＬＳとして電気角
で３０度毎のパルスを使用する場合（１サイクルで１２
回）、計数器３４の計数値ＦＣＮＴは３相交流電源１の
１０サイクル毎に、一定の周期で発振する発振器３５か
らの発振パルスＰＵＬＳを計数した計数値ＦＣＮＴがコ
ンピュータ３１に読み込まれることになる。この計数値
ＦＣＮＴが３相交流電源１の周波数に相当する値とな
る。Next, a description will be mainly given of a conventional frequency detecting device. From the phase detector 33, the sampling pulse SPLS synchronized with the frequency of the three-phase AC power supply 1 can be taken out therefrom as one signal of the digital phase signal θ. Counter 3
4 is initialized by the reset signal RST of the computer 31, the count value FCNT is set to zero, and the oscillator 35 is newly added.
The constant oscillation pulse PULS which is the output of is counted. The computer 31 performs control calculation for each sampling pulse SPLS, and supplies a signal Ec for controlling the thyristor rectifier 6 to the gate logic 32. In addition, for example, the count value FC of the counter 34 is calculated every 120 sampling pulses SPLS.
NT is read and a reset signal is output to the counter 34. Here, when a pulse every 30 degrees in electrical angle is used as the sampling pulse SPLS (12 in 1 cycle)
As for the count value FCNT of the counter 34, the count value FCNT obtained by counting the oscillation pulse PULS from the oscillator 35 that oscillates at a constant cycle is read into the computer 31 every 10 cycles of the three-phase AC power supply 1. . This count value FCNT becomes a value corresponding to the frequency of the three-phase AC power supply 1.
【０００４】[0004]
【発明が解決しようとする課題】従来の周波数検出装置
は以上のように構成されているので、コンピュータ以外
にＰＬＬ回路を用いた位相検出器、計数器といったＨ／
Ｗが必要であった。Since the conventional frequency detecting device is constructed as described above, it is possible to use a phase detector or counter such as a phase detector or a counter using a PLL circuit in addition to the computer.
W was needed.
【０００５】この発明は上記のような課題を解決するた
めになされたものであり、位相検出器、計数器を用いる
ことなく周波数を検出する装置を得ることを目的とす
る。The present invention has been made to solve the above problems, and an object thereof is to obtain an apparatus for detecting a frequency without using a phase detector or a counter.
【０００６】[0006]
【課題を解決するための手段】請求項１に係る周波数検
出装置は、３相交流電源の電圧を所定の基準角速度で回
転するｄ−ｑ軸回転座標上の電圧に変換する３相／２相
変換手段、上記３相／２相変換手段の出力の高次成分を
除去するローパスフィルタ、上記ローパスフィルタの出
力信号から位相差を演算する位相差演算手段、上記位相
差演算手段からの位相差を微分して上記ｄ−ｑ軸回転座
標上の電圧のベクトルの角速度を得る微分手段、および
上記基準角速度に上記微分手段からの電圧ベクトルの角
速度を加算して上記３相交流電源の周波数を演算する手
段を備え、上記ｄ−ｑ軸回転座標上の電圧に含まれる、
回転角速度の２倍の角速度に相当する周波数のリップル
成分を除去する移動平均演算手段を備えたものである。A frequency detecting device according to a first aspect of the present invention is a three-phase / two-phase system for converting a voltage of a three-phase AC power supply into a voltage on d-q axis rotation coordinates rotating at a predetermined reference angular velocity. Conversion means, a low-pass filter for removing high-order components of the output of the 3-phase / 2-phase conversion means, a phase difference calculation means for calculating a phase difference from the output signal of the low-pass filter, and a phase difference from the phase difference calculation means. Differentiating means for differentiating to obtain the angular velocity of the voltage vector on the d-q axis rotation coordinates, and the angular velocity of the voltage vector from the differentiating means is added to the reference angular velocity to calculate the frequency of the three-phase AC power supply. Means, and included in the voltage on the dq axis rotation coordinates,
Ripple of frequency equivalent to twice the angular velocity of rotation
It is provided with a moving average calculation means for removing components .
【０００７】請求項２に係る周波数検出装置は、第１の
角速度を入力し３相交流電源の電圧を上記第１の角速度
で回転するｄ−ｑ軸回転座標上の電圧に変換する３相／
２相変換手段、上記３相／２相変換手段の出力の高次成
分を除去するローパスフィルタ、上記ローパスフィルタ
の出力信号から位相差を演算する位相差演算手段、上記
位相差演算手段からの位相差を微分して上記ｄ−ｑ軸回
転座標上の電圧のベクトルの角速度を得る微分手段、上
記微分手段からの電圧ベクトルの角速度が零となるよう
に上記微分手段からの上記電圧ベクトルの角速度を増幅
しこの増幅した信号に所定の基準角速度を加算しこの加
算した信号を上記第１の角速度として上記３相／２相変
換手段に入力する手段、および上記第１の角速度に上記
微分手段からの電圧ベクトルの角速度を加算して上記３
相交流電源の周波数を演算する手段を備え、上記ｄ−ｑ
軸回転座標上の電圧に含まれる、回転角速度の２倍の角
速度に相当する周波数のリップル成分を除去する移動平
均演算手段を備えたものである。A frequency detecting device according to a second aspect of the present invention is a first frequency detecting device.
3-phase for converting the voltage of the input 3-phase AC power source angular velocity to the voltage on d-q axis rotating coordinate which rotates in the first angular velocity /
Two-phase conversion means, a low-pass filter for removing higher-order components of the output of the three-phase / two-phase conversion means, a phase difference calculation means for calculating a phase difference from the output signal of the low-pass filter, and a position from the phase difference calculation means. Differentiating means for differentiating the phase difference to obtain the angular velocity of the voltage vector on the d-q axis rotation coordinates, and the angular velocity of the voltage vector from the differentiating means so that the angular velocity of the voltage vector from the differentiating means becomes zero. Amplify and add a predetermined reference angular velocity to this amplified signal
The calculated signal is used as the first angular velocity and the three-phase / two-phase change is performed.
The means for inputting to the conversion means , and the above-mentioned 3 by adding the angular velocity of the voltage vector from the differentiating means to the first angular velocity.
Comprising means for calculating the frequency of the phase AC power source, the d-q
An angle that is twice the rotational angular velocity included in the voltage on the axis rotation coordinate
A moving plane that removes the ripple component of the frequency corresponding to the velocity
It is equipped with an equalizing means .
【０００８】また、請求項３に係る周波数検出装置は、
請求項１または２において、基準角速度を３相交流電源
の商用周波数に相当する値としたものである。Further, the frequency detecting device according to claim 3 is
In Claim 1 or 2, the reference angular velocity is set to a value corresponding to the commercial frequency of the three-phase AC power supply.
【０００９】また、請求項４に係る周波数検出装置は、
請求項１ないし３のいずれかにおいて、３相交流電源の
逆相電圧成分を演算する手段を備え、上記３相交流電源
の電圧から上記逆相電圧成分を減算した電圧を３相／２
相変換手段に入力するようにしたものである。A frequency detecting device according to a fourth aspect of the present invention is
The method according to any one of claims 1 to 3 , further comprising means for calculating a reverse-phase voltage component of the three-phase AC power supply, and a voltage obtained by subtracting the reverse-phase voltage component from the voltage of the three-phase AC power supply is three-phase / 2.
The input is made to the phase conversion means.
【００１０】また、請求項５に係る周波数検出装置は、
請求項４において、逆相電圧成分演算手段は、３相交流
電源の電圧の相順を逆にしてｄ−ｑ軸回転座標上の電圧
に変換することにより逆相電圧２相成分を演算する逆相
検出用３相／２相変換手段、および上記逆相電圧２相成
分をローパスフィルタを経て入力し３相交流電圧成分に
変換することにより逆相電圧成分を演算する逆相検出用
２相／３相変換手段からなるものである。A frequency detecting device according to claim 5 is
The reverse phase voltage component calculating means according to claim 4, wherein the reverse phase voltage two-phase component is calculated by reversing the phase order of the voltage of the three-phase AC power source and converting the voltage into a voltage on the dq axis rotation coordinates. Two-phase / two-phase converting means for phase detection and two-phase / two-phase converting means for reverse-phase voltage for calculating the reverse-phase voltage component by inputting the two-phase component of the reverse-phase voltage through a low-pass filter and converting it into a three-phase AC voltage component It is composed of three-phase conversion means.
【００１１】[0011]
【発明の実施の形態】実施の形態１．
以下、この発明の実施の形態１を図に基づいて説明す
る。図１は周波数検出装置を持つ高力率コンバータ等の
交流電源に接続される電力変換装置を示すブロック図で
あり、１は３相交流電源、２はリアクトル、３はインバ
ータである。インバータ３は、例えば図２に示すように
トランジスタとダイオードのブリッジ接続されたもので
ある。４は直流コンデンサ、５は直流負荷である。１１
は３相交流電源１の電圧ＶＲ、ＶＳ、ＶＴを検出する電
圧センサ、１２はインバータ３の交流側電流（インバー
タ電流）ＩＲ、ＩＳ、ＩＴを検出する電流センサ、１３
は直流コンデンサ４の電圧ＶＤを検出する電圧センサで
ある。２０は制御回路であり、ＣＰＵ２１、メモリ２
２、ゲートパルス発生回路２３、Ａ／Ｄ変換回路２４か
ら構成されており、直流電圧ＶＤが所望の値となるよう
に、３相交流電源１の電圧に応じてインバータ電流を制
御する制御演算を行い、ゲートパルス発生回路２３を介
してインバータをスイッチングさせ、交流電力を直流電
力に変換する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a power conversion device connected to an AC power supply such as a high power factor converter having a frequency detection device, 1 is a 3-phase AC power supply, 2 is a reactor, and 3 is an inverter. The inverter 3 is, for example, a bridge connection of a transistor and a diode as shown in FIG. Reference numeral 4 is a DC capacitor, and 5 is a DC load. 11
Is a voltage sensor that detects the voltages V R , V S , and V T of the three-phase AC power supply 1, 12 is a current sensor that detects the AC side currents (inverter currents) I R , I S , and I T of the inverter 3, 13
Is a voltage sensor for detecting the voltage V D of the DC capacitor 4. 20 is a control circuit, which is a CPU 21 and a memory 2
2, a gate pulse generation circuit 23, and an A / D conversion circuit 24. The control calculation controls the inverter current according to the voltage of the three-phase AC power supply 1 so that the DC voltage V D has a desired value. Then, the inverter is switched through the gate pulse generation circuit 23 to convert the AC power into the DC power.
【００１２】通常このような電力変換装置では、３相交
流電源１の周波数を検出し、装置の運転条件として用い
たり、装置の運転・入出力の監視を行う装置盤面のモニ
タ部において表示を行っている。次に本発明の周波数検
出装置について説明する。Usually, in such a power converter, the frequency of the three-phase AC power source 1 is detected and used as an operating condition of the device, or a display is displayed on a monitor portion of the device panel surface for monitoring the operation and input / output of the device. ing. Next, the frequency detection device of the present invention will be described.
【００１３】図３は、制御回路２０のＣＰＵ２１にて演
算する周波数検出のブロック図である。１０１は制御演
算にて用いているＡ／Ｄ変換回路から読み込んだ３相交
流電源１の電圧ＶＲ、ＶＳ、ＶＴを式１の演算にてｄ−
ｑ軸回転座標上の値に変換する３相／２相変換回路であ
る。FIG. 3 is a block diagram of frequency detection calculated by the CPU 21 of the control circuit 20. Reference numeral 101 represents the voltage V R , V S , and V T of the three-phase AC power supply 1 read from the A / D conversion circuit used in the control calculation by the calculation of Expression 1 d-
It is a three-phase / two-phase conversion circuit that converts the value on the q-axis rotation coordinate.
【００１４】[0014]
【数１】 [Equation 1]
【００１５】ここで、式１に示した変換行列中のω０ｔ
は回転速度設定器１０２にて与える。基準角速度ω０は
例えば３相交流電源１の商用周波数が５０Ｈｚであれば
２π５０に、６０Ｈｚであれば２π６０とし、ｔはサン
プリグ時間毎に式２にて更新する。Here, ω 0 t in the conversion matrix shown in Equation 1
Is given by the rotation speed setting device 102. The reference angular velocity ω 0 is set to 2π50 when the commercial frequency of the three-phase AC power supply 1 is 50 Hz, and is set to 2π60 when the commercial frequency is 60 Hz, and t is updated by the equation 2 at each sampling time.
【００１６】[0016]
【数２】 [Equation 2]
【００１７】例えば、ω０が２π５０、３相交流電源１
の周波数が丁度５０Ｈｚであれば、ｄ軸電圧Ｖｄ、ｑ軸
電圧Ｖｑはともに直流量となるが、もし３相交流電源１
の周波数が５０．１Ｈｚであれば、ｄ軸電圧Ｖｄ、ｑ軸
電圧Ｖｑは０．１Ｈｚの交流量を持ち、ｄ−ｑ座標上で
その電圧ベクトルＶは図４に示すように回転するものと
なる。３相交流電源１の周波数変動幅は、通常、商用電
源で０．１％程度、発電機でも３％以下と考えられるの
で、３％周波数変動時の電圧ベクトル回転周波数は、５
０Ｈｚであれば１．５Ｈｚ、６０Ｈｚでも１．８Ｈｚと
なる。従って、例えば１００μsecのサンプリングで、
電圧ベクトルの回転を処理した場合、５０Ｈｚで６６６
７回／１回転、６０Ｈｚで５５５６回／１回転の演算タ
イミングがあり、ＣＰＵ２１によるＳ／Ｗにて十分な精
度で計測することができる。For example, ω 0 is 2π50, three-phase AC power source 1
If the frequency is just 50 Hz, both the d-axis voltage Vd and the q-axis voltage Vq are direct current amounts.
If the frequency is 50.1 Hz, the d-axis voltage Vd and the q-axis voltage Vq have an alternating current amount of 0.1 Hz, and the voltage vector V rotates on the dq coordinates as shown in FIG. Become. Since the frequency fluctuation range of the three-phase AC power supply 1 is usually considered to be about 0.1% for the commercial power supply and 3% or less for the generator, the voltage vector rotation frequency at the time of the 3% frequency fluctuation is 5%.
If it is 0 Hz, it will be 1.5 Hz, and even 60 Hz will be 1.8 Hz. Therefore, for example, with sampling of 100 μsec,
666 at 50 Hz when processing the rotation of the voltage vector
There is a calculation timing of 7 times / revolution and 5556 times / revolution at 60 Hz, and the S / W by the CPU 21 can perform measurement with sufficient accuracy.
【００１８】図３に戻り、１０３はローパスフィルタで
あり、３相交流電源１が高次の電圧歪みを含んでいる場
合に、３相／２相変換後のｄ−ｑ軸上に変換した成分に
も含まれる高次の成分を除去する。そして、位相差演算
回路１０４により、ローパスフィルタ１０３の出力Ｖｄ
ｆ、Ｖｑｆから式３により、図５に示すように、ｄ軸と
電圧ベクトルとの位相差ψを求める。Returning to FIG. 3, a low-pass filter 103 is a component converted on the dq axes after three-phase / two-phase conversion when the three-phase AC power supply 1 includes high-order voltage distortion. Higher order components included in are also removed. Then, the phase difference calculation circuit 104 outputs the output Vd of the low-pass filter 103.
From f and Vqf, the phase difference ψ between the d-axis and the voltage vector is obtained from Equation 3 as shown in FIG.
【００１９】[0019]
【数３】 [Equation 3]
【００２０】この位相差を微分回路１０５にて微分する
ことにより、単位時間当たりの位相変化量、即ち角速度
ω′を得る。この角速度ω′は、３相交流電源１の角速
度ωと回転座標の角速度ω０との差の角速度であるの
で、加算器１０６にてω′とω０とを加算してωを求
め、これを計数器１０７にて１／（２π）倍し、３相交
流電源１の周波数ｆを得ることができる。By differentiating this phase difference by the differentiating circuit 105, the amount of phase change per unit time, that is, the angular velocity ω'is obtained. Since this angular velocity ω'is the angular velocity of the difference between the angular velocity ω of the three-phase AC power supply 1 and the angular velocity ω 0 of the rotating coordinate, the adder 106 adds ω'and ω 0 to obtain ω, The counter 107 can be multiplied by 1 / (2π) to obtain the frequency f of the three-phase AC power supply 1.
【００２１】このように、位相検出器、計数器等のＨ／
Ｗを用いることなく周波数を検出することができるの
で、制御回路の小型化・低コスト化が図れる。In this way, H / of the phase detector, counter, etc.
Since the frequency can be detected without using W, the size and cost of the control circuit can be reduced.
【００２２】実施の形態２．
上記実施の形態１では３相交流電圧１に高次の電圧歪み
が含まれている場合を考慮していたが、実施の形態２で
は電圧不平衡がある場合の周波数検出方法を説明する。
図６は制御回路２０のＣＰＵ２１にて演算する実施の形
態２の周波数検出装置のブロック図であり、実施の形態
１との違いは、移動平均演算回路１０８によりローパス
フィルタ１０３の出力の移動平均演算を行い、移動平均
後の信号Ｖｄｆａ、Ｖｑｆａから位相差ψを求めている
点である。Embodiment 2. In the above-described first embodiment, the case where the three-phase AC voltage 1 includes high-order voltage distortion is considered, but in the second embodiment, a frequency detection method in the case of voltage imbalance will be described.
FIG. 6 is a block diagram of the frequency detecting device of the second embodiment which is calculated by the CPU 21 of the control circuit 20. The difference from the first embodiment is that the moving average calculation circuit 108 calculates the moving average of the output of the low pass filter 103. Is performed and the phase difference ψ is obtained from the signals Vdfa and Vqfa after the moving average.
【００２３】ところで、３相交流電源の電圧ＶＲ、
ＶＳ、ＶＴに電圧不平衡があると、ｄ−ｑ軸上の電圧Ｖ
ｄ、Ｖｑに基本周波数の２倍周波のリップル成分が存在
する。今、３相交流電圧ＶＲ、ＶＳ、ＶＴが、式４に示
すように、例えば、その振幅に関して不平衡がある場合
を想定すると、ｄ−ｑ軸上の電圧Ｖｑ、Ｖｄは式１を適
用することにより、それぞれ式５、式６で示される。By the way, the voltage V R of the three-phase AC power supply,
When there is a voltage imbalance in V S and V T , the voltage V on the d-q axes
There is a double frequency ripple component of the fundamental frequency in d and Vq. Now, assuming that the three-phase AC voltages V R , V S , and V T are unbalanced with respect to their amplitudes, as shown in Expression 4, the voltages Vq and Vd on the dq axes are expressed by Expression 1 By applying the above equations, equations 5 and 6 are obtained.
【００２４】[0024]
【数４】 [Equation 4]
【００２５】[0025]
【数５】 [Equation 5]
【００２６】[0026]
【数６】 [Equation 6]
【００２７】式５、式６から判るように、電圧不平衡が
あると、電圧Ｖｄ、Ｖｑに基本周波数の２倍周波のリッ
プル分が存在し、このまま位相差ψの変化速度を求めて
も正しい角速度を得ることができない。そこで、この実
施の形態２においては、移動平均演算回路１０８を設
け、Ｔ０＝１／ω０の周期で移動平均を演算する。実施
の形態１で述べたように、３相交流電源１の周波数変動
幅は多い場合でも３％以下と考えられるので、上記の移
動平均をとることにより、移動平均の周期Ｔ０の整数分
の１の（周波数が整数倍の）高調波は平均化されほぼ零
となって上述したリップル分をほぼ除去することができ
る。As can be seen from equations (5) and (6), when there is a voltage imbalance, there is a ripple component of the double frequency of the fundamental frequency in the voltages Vd and Vq, and even if the rate of change of the phase difference ψ is calculated as it is, Unable to get angular velocity. Therefore, in the second embodiment, the moving average calculation circuit 108 is provided to calculate the moving average in the cycle of T 0 = 1 / ω0. As described in the first embodiment, the frequency fluctuation range of the three-phase AC power supply 1 is considered to be 3% or less even when it is large. Therefore, by taking the moving average described above, an integer part of the period T 0 of the moving average is obtained. Harmonics of 1 (frequency is an integral multiple) are averaged and become almost zero, and the above-mentioned ripple component can be almost removed.
【００２８】このように、位相検出器、計数器等のＨ／
Ｗを用いることなく周波数を検出することができるのに
加え、３相交流電源に電圧不平衡があっても正確に周波
数を検出することができる。As described above, the phase detector, counter, etc. of H /
In addition to being able to detect the frequency without using W, the frequency can be accurately detected even if the three-phase AC power supply has a voltage imbalance.
【００２９】実施の形態３．
上記実施の形態２では電圧不平衡に対する影響を移動平
均により除去していたが、実施の形態３では、３相交流
電源１の逆相電圧を求め、これを３相交流電源電圧１の
各相電圧より減じ、不平衡のない正相電圧を作成し、こ
の正相電圧を基に上記実施の形態１と同一の方法で、電
圧不平衡の影響を受けない周波数検出を行っている。Embodiment 3. In the second embodiment, the influence on the voltage imbalance is removed by the moving average, but in the third embodiment, the reverse phase voltage of the three-phase AC power supply 1 is obtained and is calculated for each phase of the three-phase AC power supply voltage 1. A positive phase voltage without imbalance is created by subtracting the voltage from the voltage, and based on this positive phase voltage, frequency detection that is not affected by voltage imbalance is performed by the same method as in the first embodiment.
【００３０】図７は制御回路２０のＣＰＵ２１にて演算
する実施の形態３の周波数検出ブロック図であり、実施
の形態１との違いは逆相検出用３相／２相変換回路１１
１、ローパスフィルタ１１２、逆相検出用２相／３相変
換回路１１３、減算器１１４〜１１６を追加した点であ
る。逆相検出用３相／２相変換回路１１１は、式７に示
すように相順を逆にした変換行列により、ｄ軸、ｑ軸上
で逆相電圧成分を直流量として含んでいる信号Ｖｄｒ、
Ｖｑｒを作成する。FIG. 7 is a frequency detection block diagram of the third embodiment which is calculated by the CPU 21 of the control circuit 20. The difference from the first embodiment is the three-phase / two-phase conversion circuit 11 for reverse phase detection.
1, a low-pass filter 112, an anti-phase detection 2-phase / 3-phase conversion circuit 113, and subtractors 114 to 116 are added. The three-phase / two-phase conversion circuit 111 for anti-phase detection uses the conversion matrix in which the phase order is reversed as shown in Expression 7 to output the signal Vdr including the anti-phase voltage component as the DC amount on the d-axis and the q-axis. ,
Create Vqr.
【００３１】[0031]
【数７】 [Equation 7]
【００３２】従って、この信号をローパスフィルタ１１
２に入力し、逆相電圧に相当した直流成分Ｖｄｒｆ、Ｖ
ｑｒｆを取りだすことができる。これを式８に示す逆相
検出用２相／３相変換回路１１３により３相座標上の信
号ＶＲｒ、ＶＳｒ、ＶＴｒに変換し、減算器１１４〜１
１６により３相交流電源１の電圧ＶＲ、ＶＳ、ＶＴから
それぞれ減じることにより、不平衡の無い３相電圧ＶＲ
ｎ、ＶＳｎ、ＶＴｎを得る。この信号を上記実施の形態
１と同様に、３相／２相変換回路１０１への入力とする
ことにより３相交流電源１の周波数ｆを検出する。Therefore, this signal is applied to the low-pass filter 11
2 to the DC component Vdrf, V corresponding to the reverse phase voltage
qrf can be taken out. This was converted by reverse phase detecting 2-phase / 3-phase conversion circuit 113 shown in Formula 8 signal V R r on 3-phase coordinates, V S r, the V T r, the subtractor 114-1
By subtracting 16 from the voltages V R , V S , and V T of the three-phase AC power supply 1, the three-phase voltage V R without unbalance is obtained.
n, V S n, and V T n are obtained. The frequency f of the three-phase AC power supply 1 is detected by inputting this signal to the three-phase / two-phase conversion circuit 101 as in the first embodiment.
【００３３】[0033]
【数８】 [Equation 8]
【００３４】このように３相交流電源の逆相分を常時検
出し、これを３相交流電源電圧から減じ、不平衡の無い
正相分のみの電圧としてから、周波数を検出しているの
で、上記実施の形態２と比べて、逆相分をより正確に除
去することができ、位相検出器、計数器等のＨ／Ｗを用
いることなく周波数を検出することができるのに加え、
３相交流電源に電圧不平衡があっても、周波数変動幅に
よらず正確に周波数を検出することができる。As described above, since the reverse phase component of the three-phase AC power supply is constantly detected, this is subtracted from the three-phase AC power supply voltage, and the voltage of only the positive phase component without unbalance is detected to detect the frequency. Compared to the second embodiment, the antiphase component can be removed more accurately, and the frequency can be detected without using the H / W of the phase detector, the counter, etc.
Even if the three-phase AC power supply has a voltage imbalance, the frequency can be accurately detected regardless of the frequency fluctuation range.
【００３５】勿論、実施の形態２の移動平均演算による
方式と、実施の形態３の逆相電圧検出による方式との両
者を併用することもでき、この場合、一層高精度の周波
数検出が可能となる。Of course, it is possible to use both the moving average calculation method of the second embodiment and the negative phase voltage detection method of the third embodiment, and in this case, it is possible to detect the frequency with higher accuracy. Become.
【００３６】実施の形態４．
上記実施の形態１ないし３では、ｄ−ｑ軸回転座標の回
転速度を５０Ｈｚまたは６０Ｈｚに固定していたが、こ
の実施の形態４では位相差ψが一定となるように回転速
度を変化させるよう構成している。図８は制御回路２０
のＣＰＵ２１にて演算する実施の形態４の周波数検出ブ
ロック図であり、実施の形態１との違いは、３相／２相
変換回路１０１のｄ−ｑ軸回転座標の角速度を第１の角
速度ω１とし、微分回路１０５からの出力である角速度
ω′を積分演算などで増幅し第２の角速度ω２として出
力する増幅回路１０９、第２の角速度ω２と３相交流電
源１の基準角速度ω０（２π５０または２π６０）とを
加算する加算器１１０を追加した点である。Fourth Embodiment In the first to third embodiments described above, the rotation speed of the dq axis rotation coordinates is fixed to 50 Hz or 60 Hz, but in the fourth embodiment, the rotation speed is changed so that the phase difference ψ becomes constant. I am configuring. FIG. 8 shows the control circuit 20.
It is a frequency detection block diagram of the fourth embodiment which is calculated by the CPU 21 of the above. The difference from the first embodiment is that the angular velocity of the dq axis rotation coordinates of the three-phase / two-phase conversion circuit 101 is changed to the first angular velocity ω. 1, and the output from the differentiating circuit 105 angular omega 'amplified by such an integrating operational amplifier circuit 109 for outputting the second as an angular velocity omega 2, a second angular velocity omega 2 and 3-phase AC power source 1 of the reference angular velocity omega The point is that an adder 110 for adding 0 (2π50 or 2π60) is added.
【００３７】３相交流電源１の角速度ωとω０との差に
より、ｄ−ｑ軸上で電圧ベクトルは差の角速度ω′で回
転する。従って、ω′が正の時はω１を増加し、ω′が
負の時はω１を減少させることにより、ω１を３相交流
電源１の角速度ωと同一とすることができる。ω１の増
減制御を増幅回路１０９を用いたフィードバックループ
を構成することにより実現している。応答を良くするた
めに増幅演算の出力ω２にあらかじめ基準値ω０を加算
し、増幅演算の出力信号が調整分として働くように構成
している。従って、定常的にはω′はほぼ零となりω１
が３相交流電源１の角速度ωとなる。しかし、過渡的に
も正確な周波数を検出するために、ω′が零でない場合
を考慮し、実施の形態１と同じくω′とω１とを加算器
１０６にて加算してから、計数器１０７にて１／（２
π）倍し、３相交流電源１の周波数ｆを求めている。Due to the difference between the angular velocities ω and ω 0 of the three-phase AC power supply 1, the voltage vector rotates at the difference angular velocity ω'on the dq axes. Therefore, by increasing ω 1 when ω ′ is positive and decreasing ω 1 when ω ′ is negative, ω 1 can be made equal to the angular velocity ω of the three-phase AC power supply 1. The increase / decrease control of ω 1 is realized by configuring a feedback loop using the amplifier circuit 109. In order to improve the response, the reference value ω 0 is added in advance to the output ω 2 of the amplification calculation, and the output signal of the amplification calculation works as an adjustment component. Therefore, ω ′ is almost zero and ω 1
Is the angular velocity ω of the three-phase AC power supply 1. However, in order to detect an accurate frequency even in a transient state, considering the case where ω ′ is not zero, ω ′ and ω 1 are added by the adder 106 as in the first embodiment, and then the counter is added. 1 / (2 at 107
π) times to find the frequency f of the three-phase AC power supply 1.
【００３８】このように３相交流電源の角速度と回転座
標の角速度とが同じになるようにフィードバックループ
を構成しているので、位相検出器、計数器等のＨ／Ｗを
用いることなく周波数を精度良く検出することができ
る。Since the feedback loop is constructed so that the angular velocity of the three-phase AC power supply and the angular velocity of the rotating coordinates are the same, the frequency can be determined without using the H / W of the phase detector, counter, etc. It can be detected accurately.
【００３９】なお、上記実施の形態４では実施の形態１
の周波数検出装置に位相差ψを一定に制御するフィード
バックループを追加しているが、同様の構成は実施の形
態２、３に対しても構成することができる。In the fourth embodiment, the first embodiment is used.
Although a feedback loop for controlling the phase difference ψ to be constant is added to the frequency detecting device of 1 above, the same configuration can be applied to the second and third embodiments.
【００４０】なお、上記各実施の形態では位相差ψの演
算にsin−１を用いているが（式３）、cos−１、tan
−１等を用いても良い。In each of the above embodiments, sin -1 is used to calculate the phase difference ψ (Equation 3), but cos -1, tan
-1 or the like may be used.
【００４１】また、ローパスフィルタを微分演算の後方
に配置してもよく、３相／２相変換回路の出力には必ず
しもフィルタを設けなくてもよい。Further, the low-pass filter may be arranged after the differential operation, and the filter of the output of the three-phase / two-phase conversion circuit does not necessarily have to be provided.
【００４２】また、上記各実施の形態では、基準角速度
ω０として、３相交流電源１の商用周波数である５０Ｈ
ｚまたは６０Ｈｚに相当する値としているが、これに限
られるものではなく、例えば、５５Ｈｚとして５０Ｈ
ｚ、６０Ｈｚのいずれの商用周波数の場合にも、共用で
適用できるようにしてもよい。In each of the above embodiments, the reference angular velocity ω 0 is set to 50 H, which is the commercial frequency of the three-phase AC power supply 1.
Although it is set to a value corresponding to z or 60 Hz, the value is not limited to this, and for example, 55 Hz is 50H.
It may be commonly applied to any of the commercial frequencies of z and 60 Hz.
【００４３】[0043]
【発明の効果】以上のように、請求項１に係る周波数検
出装置においては、３相交流電源の電圧を所定の基準角
速度で回転するｄ−ｑ軸回転座標上の電圧に変換する３
相／２相変換手段、上記３相／２相変換手段の出力の高
次成分を除去するローパスフィルタ、上記ローパスフィ
ルタの出力信号から位相差を演算する位相差演算手段、
上記位相差演算手段からの位相差を微分して上記ｄ−ｑ
軸回転座標上の電圧のベクトルの角速度を得る微分手
段、および上記基準角速度に上記微分手段からの電圧ベ
クトルの角速度を加算して上記３相交流電源の周波数を
演算する手段を備え、上記ｄ−ｑ軸回転座標上の電圧に
含まれる、回転角速度の２倍の角速度に相当する周波数
のリップル成分を除去する移動平均演算手段を備えたの
で、ＰＬＬ回路を用いた位相検出器、計数器等のＨ／Ｗ
を用いることなく周波数を検出することができ、構成の
小型化、低コスト化が図れる。更に、３相交流電源に存
在する高調波成分の影響が抑制され、周波数の検出精度
も向上する。更に、３相交流電源に存在する電圧不平衡
成分の影響が抑制され周波数の検出精度が向上する。 As described above, in the frequency detecting device according to the first aspect, the voltage of the three-phase AC power supply is converted into the voltage on the dq axis rotating coordinates which rotates at a predetermined reference angular velocity.
Phase / two-phase conversion means, low-pass filter for removing higher-order components of the output of the three-phase / two-phase conversion means, phase-difference calculation means for calculating a phase difference from the output signal of the low-pass filter,
The phase difference from the phase difference calculating means is differentiated to obtain the dq
D- means for obtaining the angular velocity of the vector of the voltage on the axis of rotation coordinates, and means for calculating the frequency of the three-phase AC power source by adding the angular velocity of the voltage vector from the differentiating means to the reference angular velocity, For the voltage on the q-axis rotation coordinate
Included frequency equivalent to twice the angular velocity of rotation
Since it is equipped with a moving average calculating means for removing the ripple component of, the phase detector using the PLL circuit, the H / W of the counter, etc.
The frequency can be detected without using, and the size and cost of the structure can be reduced. Further, the influence of the harmonic components existing in the three-phase AC power supply is suppressed, and the frequency detection accuracy is improved. Furthermore, the voltage imbalance existing in the three-phase AC power supply
The influence of the component is suppressed and the frequency detection accuracy is improved.
【００４４】請求項２に係る周波数検出装置において
は、第１の角速度を入力し３相交流電源の電圧を上記第
１の角速度で回転するｄ−ｑ軸回転座標上の電圧に変換
する３相／２相変換手段、上記３相／２相変換手段の出
力の高次成分を除去するローパスフィルタ、上記ローパ
スフィルタの出力信号から位相差を演算する位相差演算
手段、上記位相差演算手段からの位相差を微分して上記
ｄ−ｑ軸回転座標上の電圧のベクトルの角速度を得る微
分手段、上記微分手段からの電圧ベクトルの角速度が零
となるように上記微分手段からの上記電圧ベクトルの角
速度を増幅しこの増幅した信号に所定の基準角速度を加
算しこの加算した信号を上記第１の角速度として上記３
相／２相変換手段に入力する手段、および上記第１の角
速度に上記微分手段からの電圧ベクトルの角速度を加算
して上記３相交流電源の周波数を演算する手段を備え、
上記ｄ−ｑ軸回転座標上の電圧に含まれる、回転角速度
の２倍の角速度に相当する周波数のリップル成分を除去
する移動平均演算手段を備えたので、ＰＬＬ回路を用い
た位相検出器、計数器等のＨ／Ｗを用いることなく周波
数を検出することができ、構成の小型化、低コスト化が
図れる。更に、３相交流電源に存在する高調波成分の影
響が抑制され、周波数の検出精度も向上する。更に、３
相交流電源に存在する電圧不平衡成分の影響が抑制され
周波数の検出精度が向上する。 [0044] In the frequency detector according to claim 2, three-phase to convert the first voltage input and three-phase AC power source angular velocity to the voltage on d-q axis rotating coordinate which rotates in the first angular velocity / 2 phase conversion means, a low pass filter for removing higher order components of the output of the 3 phase / 2 phase conversion means, a phase difference calculation means for calculating a phase difference from an output signal of the low pass filter, and a phase difference calculation means. Differentiating means for differentiating the phase difference to obtain the angular velocity of the voltage vector on the d-q axis rotation coordinates, and the angular velocity of the voltage vector from the differentiating means so that the angular velocity of the voltage vector from the differentiating means becomes zero. And a predetermined reference angular velocity is added to this amplified signal.
The summed signal is used as the first angular velocity and the above 3
Means for inputting to the phase / two-phase conversion means , and means for calculating the frequency of the three-phase AC power source by adding the angular velocity of the voltage vector from the differentiating means to the first angular velocity ,
Rotational angular velocity included in the voltage on the dq axis rotation coordinates
Ripple component of frequency corresponding to twice the angular velocity of
Since the moving average calculating means is provided, the frequency can be detected without using an H / W such as a phase detector or a counter using a PLL circuit, and the size and cost of the structure can be reduced. Further, the influence of the harmonic components existing in the three-phase AC power supply is suppressed, and the frequency detection accuracy is improved. Furthermore, 3
The influence of the voltage unbalanced component existing in the phase AC power supply is suppressed.
The frequency detection accuracy is improved.
【００４５】また、請求項３に係る周波数検出装置にお
いては、基準角速度を上記３相交流電源の商用周波数に
相当する値としたので、３相交流電源の検出すべき周波
数と、検出制御の基準とする周波数との偏差が小さくな
り、精度の高い周波数検出が可能となる。Further, in the frequency detecting device according to the third aspect, since the reference angular velocity is a value corresponding to the commercial frequency of the three-phase AC power supply, the frequency to be detected by the three-phase AC power supply and the reference for detection control. The deviation from the frequency becomes smaller and the frequency can be detected with high accuracy.
【００４６】また、請求項４に係る周波数検出装置にお
いては、３相交流電源の逆相電圧成分を演算する手段を
備え、上記３相交流電源の電圧から上記逆相電圧成分を
減算した電圧を３相／２相変換手段に入力するようにし
たので、３相交流電源に存在する逆相電圧成分が除去さ
れ、周波数の検出精度が向上する。Further, in the frequency detecting device according to the fourth aspect of the present invention, there is provided means for calculating an anti-phase voltage component of the three-phase AC power supply, and a voltage obtained by subtracting the anti-phase voltage component from the voltage of the three-phase AC power supply is obtained. Since the signal is input to the 3-phase / 2-phase conversion means, the reverse phase voltage component existing in the 3-phase AC power source is removed, and the frequency detection accuracy is improved.
【００４７】また、請求項５に係る周波数検出装置にお
いては、逆相電圧成分演算手段は、３相交流電源の電圧
の相順を逆にしてｄ−ｑ軸回転座標上の電圧に変換する
ことにより逆相電圧２相成分を演算する逆相検出用３相
／２相変換手段、および上記逆相電圧２相成分をローパ
スフィルタを経て入力し３相交流電圧成分に変換するこ
とにより逆相電圧成分を演算する逆相検出用２相／３相
変換手段からなるので、３相交流電源の逆相電圧成分の
検出がＨ／Ｗを用いることなく簡単な構成で実現する。Further, in the frequency detecting device according to the fifth aspect , the negative phase voltage component calculating means reverses the phase order of the voltage of the three-phase AC power source and converts it into the voltage on the dq axis rotating coordinates. A three-phase / two-phase conversion unit for detecting a reverse phase for calculating a two-phase component of a reverse-phase voltage by means of the above, and a two-phase component of the above-mentioned reverse-phase voltage which is input through a low-pass filter and converted into a three-phase AC voltage component, thereby obtaining a reverse-phase voltage. Since it is composed of two-phase / three-phase conversion means for detecting a reverse phase for calculating a component, detection of a reverse-phase voltage component of a three-phase AC power supply can be realized with a simple configuration without using H / W.
【図１】 この発明の実施の形態１の周波数検出装置を
使用した電力変換装置を示すブロック図である。FIG. 1 is a block diagram showing a power conversion device using a frequency detection device according to a first embodiment of the present invention.
【図２】 実施の形態１のインバータの略線図である。FIG. 2 is a schematic diagram of the inverter according to the first embodiment.
【図３】 実施の形態１の周波数検出装置を示すブロッ
ク図である。FIG. 3 is a block diagram showing a frequency detection device according to the first embodiment.
【図４】 実施の形態１による周波数検出方法を説明す
るベクトル図である。FIG. 4 is a vector diagram illustrating a frequency detection method according to the first embodiment.
【図５】 実施の形態１による周波数検出装置を説明す
るベクトル図である。FIG. 5 is a vector diagram illustrating the frequency detection device according to the first embodiment.
【図６】 実施の形態２の周波数検出装置を示すブロッ
ク図である。FIG. 6 is a block diagram showing a frequency detection device according to a second embodiment.
【図７】 実施の形態３の周波数検出装置を示すブロッ
ク図である。FIG. 7 is a block diagram showing a frequency detection device according to a third embodiment.
【図８】 実施の形態４の周波数検出装置を示すブロッ
ク図である。FIG. 8 is a block diagram showing a frequency detection device according to a fourth embodiment.
【図９】 従来の周波数検出装置を使用した電力変換装
置を示すブロック図である。FIG. 9 is a block diagram showing a power conversion device using a conventional frequency detection device.
【図１０】 サイリスタ整流器の略線図である。FIG. 10 is a schematic diagram of a thyristor rectifier.
１ ３相交流電源、１０１ ３相／２相変換回路、１０
２ 回転速度設定器、１０３ ローパスフィルタ、１０
４ 位相差演算回路、１０５ 微分回路、１０６ 加算
器、１０７ 計数器、１０８ 移動平均演算回路、１０
９ 増幅回路、１１０ 加算器、１１１ 逆相検出用３
相／２相変換回路、１１２ ローパスフィルタ、１１３
逆相検出用２相／３相変換回路、１１４〜１１６ 減
算器、ＶＲ，ＶＳ，ＶＴ ３相交流電源電圧、ＶＲｒ，
ＶＳｒ，ＶＴｒ 逆相電圧成分、Ｖｄ，Ｖｑ ｄ−ｑ軸
電圧、ψ 位相差、ω０ 基準角速度、ω′ 電圧ベク
トルの角速度、ω１ 第１の角速度、ω２ 第２の角速
度、ω ３相交流電源の角速度、ｆ ３相交流電源の周
波数。1 3 phase AC power supply, 101 3 phase / 2 phase conversion circuit, 10
2 Rotation speed setting device, 103 low-pass filter, 10
4 phase difference calculating circuit, 105 differentiating circuit, 106 adder, 107 counter, 108 moving average calculating circuit, 10
9 amplifier circuit, 110 adder, 111 for reverse phase detection 3
Phase / 2-phase conversion circuit, 112 low-pass filter, 113
Reverse phase detecting 2-phase / 3-phase conversion circuit, 114 to 116 subtractor, V R, V S, V T 3 -phase AC power supply voltage, V R r,
V S r, V T r anti-phase voltage component, Vd, Vq d−q axis voltage, ψ phase difference, ω 0 reference angular velocity, ω ′ voltage vector angular velocity, ω 1 first angular velocity, ω 2 second angular velocity , Ω angular velocity of the 3-phase AC power supply, f 3 frequency of the 3-phase AC power supply.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G01R 23/14 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) G01R 23/14
Claims (5)
で回転するｄ−ｑ軸回転座標上の電圧に変換する３相／
２相変換手段、上記３相／２相変換手段の出力の高次成
分を除去するローパスフィルタ、上記ローパスフィルタ
の出力信号から位相差を演算する位相差演算手段、上記
位相差演算手段からの位相差を微分して上記ｄ−ｑ軸回
転座標上の電圧のベクトルの角速度を得る微分手段、お
よび上記基準角速度に上記微分手段からの電圧ベクトル
の角速度を加算して上記３相交流電源の周波数を演算す
る手段を備え、 上記ｄ−ｑ軸回転座標上の電圧に含まれる、回転角速度
の２倍の角速度に相当する周波数のリップル成分を除去
する移動平均演算手段を備えた 周波数検出装置。1. A 3-phase / converting voltage of a 3-phase AC power supply into a voltage on d-q axis rotation coordinates rotating at a predetermined reference angular velocity.
Two-phase conversion means, a low-pass filter for removing higher-order components of the output of the three-phase / two-phase conversion means, a phase difference calculation means for calculating a phase difference from the output signal of the low-pass filter, and a position from the phase difference calculation means. Differentiating means for differentiating the phase difference to obtain the angular velocity of the vector of the voltage on the dq axis rotation coordinates, and adding the angular velocity of the voltage vector from the differentiating means to the reference angular velocity to determine the frequency of the three-phase AC power supply. and means for calculating, included in the voltage on the d-q axis rotating coordinate, the rotation angular velocity
Ripple component of frequency corresponding to twice the angular velocity of
A frequency detecting device having a moving average calculating means .
圧を上記第１の角速度で回転するｄ−ｑ軸回転座標上の
電圧に変換する３相／２相変換手段、上記３相／２相変
換手段の出力の高次成分を除去するローパスフィルタ、
上記ローパスフィルタの出力信号から位相差を演算する
位相差演算手段、上記位相差演算手段からの位相差を微
分して上記ｄ−ｑ軸回転座標上の電圧のベクトルの角速
度を得る微分手段、上記微分手段からの電圧ベクトルの
角速度が零となるように上記微分手段からの上記電圧ベ
クトルの角速度を増幅しこの増幅した信号に所定の基準
角速度を加算しこの加算した信号を上記第１の角速度と
して上記３相／２相変換手段に入力する手段、および上
記第１の角速度に上記微分手段からの電圧ベクトルの角
速度を加算して上記３相交流電源の周波数を演算する手
段を備え、 上記ｄ−ｑ軸回転座標上の電圧に含まれる、回転角速度
の２倍の角速度に相当する周波数のリップル成分を除去
する移動平均演算手段を備えた 周波数検出装置。2. A 3-phase / 2-phase converting means for a first voltage input and three-phase AC power source angular velocity is converted into a voltage on the d-q axes rotating coordinate which rotates in the first angular velocity, the 3-phase A low-pass filter for removing higher-order components of the output of the / 2-phase conversion means,
Phase difference calculating means for calculating a phase difference from the output signal of the low-pass filter, differentiating means for differentiating the phase difference from the phase difference calculating means to obtain an angular velocity of a vector of voltage on the dq axis rotation coordinates, The angular velocity of the voltage vector from the differentiating means is amplified so that the angular velocity of the voltage vector from the differentiating means becomes zero , a predetermined reference angular velocity is added to the amplified signal, and the added signal is used as the first angular velocity. by adding the angular speed of the voltage vector from the differentiating means means for inputting to the 3-phase / 2-phase converting means, and the first angular velocity comprises means for calculating the frequency of the three-phase AC power source, the d- Rotational angular velocity included in the voltage on the q-axis rotation coordinate
Ripple component of frequency corresponding to twice the angular velocity of
A frequency detecting device having a moving average calculating means .
に相当する値としことを特徴とする請求項１または２記
載の周波数検出装置。3. The frequency detecting device according to claim 1, wherein the reference angular velocity is a value corresponding to a commercial frequency of the three-phase AC power supply.
手段を備え、上記３相交流電源の電圧から上記逆相電圧
成分を減算した電圧を３相／２相変換手段に入力するよ
うにしたことを特徴とする請求項１ないし３のいずれか
に記載の周波数検出装置。4. A negative-phase voltage component of a three-phase AC power supply is calculated.
Means for converting the voltage of the three-phase AC power supply to the opposite-phase voltage
Input the voltage with the component subtracted into the 3-phase / 2-phase conversion means.
4. The method according to any one of claims 1 to 3, characterized in that
The frequency detection device according to.
の電圧の相順を逆にしてｄ−ｑ軸回転座標上の電圧に変
換することにより逆相電圧２相成分を演算する逆相検出
用３相／２相変換手段、および上記逆相電圧２相成分を
ローパスフィルタを経て入力し３相交流電圧成分に変換
することにより逆相電圧成分を演算する逆相検出用２相
／３相変換手段からなることを特徴とする請求項４記載
の周波数検出装置。5. The anti-phase voltage component calculation means is a three-phase AC power supply.
Reverse the phase order of the voltage and change to the voltage on the dq axis rotation coordinates.
Reversed-phase detection to calculate two-phased components of reversed-phase voltage by switching
3 phase / 2 phase conversion means for
Input through low pass filter and convert into 3 phase AC voltage component
Two-phase for negative-phase detection that calculates negative-phase voltage component by
5. A three-phase conversion means is included.
Frequency detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32529196A JP3492124B2 (en) | 1996-12-05 | 1996-12-05 | Frequency detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32529196A JP3492124B2 (en) | 1996-12-05 | 1996-12-05 | Frequency detector |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003310869A Division JP3621086B2 (en) | 2003-09-03 | 2003-09-03 | Frequency detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10170563A JPH10170563A (en) | 1998-06-26 |
| JP3492124B2 true JP3492124B2 (en) | 2004-02-03 |
Family
ID=18175182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32529196A Expired - Fee Related JP3492124B2 (en) | 1996-12-05 | 1996-12-05 | Frequency detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3492124B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881796B (en) * | 2010-06-30 | 2013-01-09 | 天津市德力电子仪器有限公司 | Frequency counting module and counting method and application |
| JP5855886B2 (en) * | 2010-09-30 | 2016-02-09 | 株式会社ダイヘン | Frequency detector |
| JP6247433B2 (en) * | 2012-02-21 | 2017-12-13 | 株式会社ダイヘン | Frequency detection device and isolated operation detection device including the frequency detection device |
| US20140229133A1 (en) * | 2013-02-12 | 2014-08-14 | Mitsubishi Electric Research Laboratories, Inc. | Method for Estimating Frequencies and Phases in Three Phase Power System |
| CN106019068B (en) * | 2016-06-20 | 2018-08-31 | 北京交通大学 | A kind of net pressure interruption detection and control method of EMU net side current transformer |
| CN107271772B (en) * | 2017-06-12 | 2019-06-25 | 南京工程学院 | A kind of mains frequency rapid detection method of high-precision and anti-noise jamming |
| US11933825B2 (en) * | 2020-01-30 | 2024-03-19 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | System frequency detector |
-
1996
- 1996-12-05 JP JP32529196A patent/JP3492124B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10170563A (en) | 1998-06-26 |
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