JP2008271728A - Series multiple inverter and overvoltage preventing method - Google Patents
Series multiple inverter and overvoltage preventing method Download PDFInfo
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本発明は、単相インバータの出力を複数台直列接続して各相を構成し、高圧交流電圧出力を得るようにした直列多重インバータと過電圧防止方法に関する。 The present invention relates to a serial multiple inverter and an overvoltage prevention method in which a plurality of single-phase inverter outputs are connected in series to form each phase to obtain a high-voltage AC voltage output.
一般にインバータの過電圧防止方法は、直流電圧値を監視し、回生エネルギーによる電圧値の上昇を検知したら、モータの減速レートを緩やかにしたり、回生側のトルク制限値を小さくすることで、回生エネルギーを抑制し過電圧を防止している（例えば、非特許文献１参照）。 In general, the inverter overvoltage prevention method monitors the DC voltage value, and if an increase in voltage value due to regenerative energy is detected, regenerative energy can be reduced by slowing the motor deceleration rate or reducing the torque limit value on the regenerative side. It suppresses and prevents overvoltage (for example, refer nonpatent literature 1).
過電圧防止機能を持った直列多重インバータの構成例を図６に示す。６０２は三相トランスであり、２次側に設けられた巻線に６３１〜６３３、６４１〜６４３、６５１〜６５３の単相インバータが接続されている。前記単相インバータは、６６１コンバータ部の三相全波整流出力を６６２平滑コンデンサにより平滑された直流電圧を入力し単相を出力する６６３インバータ部により構成され、前記単相インバータの出力を各相３台ずつ直列に接続することで直列多重インバータを構成し、高圧交流電圧を出力して６０６交流電動機を駆動する。 FIG. 6 shows a configuration example of a series multiple inverter having an overvoltage prevention function. Reference numeral 602 denotes a three-phase transformer, and single-phase inverters 631 to 633, 641 to 643, and 651 to 653 are connected to windings provided on the secondary side. The single-phase inverter is composed of a 663 inverter unit that inputs a DC voltage obtained by smoothing the three-phase full-wave rectified output of the 661 converter unit by a 662 smoothing capacitor and outputs a single phase, and outputs the single-phase inverter for each phase. By connecting three units in series, a series multiple inverter is configured, and a high-voltage AC voltage is output to drive a 606 AC motor.
前記交流電動機により回生エネルギーが発生すると、前記平滑コンデンサの両端の直流電圧が上昇する。これを防止するため前記単相インバータ毎に６６４直流電圧検出回路を設け、その出力６６５直流電圧検出値を６６６過電圧防止回路に取り込み回生エネルギーを抑制することで過電圧を防止している。 When regenerative energy is generated by the AC motor, the DC voltage across the smoothing capacitor rises. In order to prevent this, a 664 DC voltage detection circuit is provided for each single-phase inverter, and the output 665 DC voltage detection value is taken into the 666 overvoltage prevention circuit to suppress regenerative energy, thereby preventing overvoltage.
このように、従来の直列多重インバータでは、単相インバータ毎に直流電圧検出回路を設け、その検出値を使って過電圧を防止する、という手順がとられていた。
従来の直列多重インバータの過電圧防止方法では、単相インバータ毎に直流電圧検出回路を設け、その検出値を過電圧防止回路に送るという手順をとっているので、回路構成が複雑となり、装置が高価になってしまうという問題があった。
本発明はこのような問題点に鑑みてなされたものであり、単相インバータごとの直流電圧検出回路がなくとも出力直流電圧が生成でき安価で簡素な回路構成で過電圧を防止できる直列多重インバータと過電圧防止方法を提供することを目的とする。
In the conventional overvoltage prevention method for series multiple inverters, a DC voltage detection circuit is provided for each single-phase inverter, and the detected value is sent to the overvoltage prevention circuit. This complicates the circuit configuration and makes the device expensive. There was a problem of becoming.
The present invention has been made in view of such problems, and a series multiplex inverter capable of generating an output DC voltage without a DC voltage detection circuit for each single-phase inverter and preventing overvoltage with an inexpensive and simple circuit configuration, and An object is to provide an overvoltage prevention method.
上記問題を解決するため、本発明は、次のようにしたのである。
請求項１に記載の発明は、３相交流入力電圧から複数の３相交流出力電圧を生成するトランスと、前記３相交流出力電圧から単相交流電圧を生成する複数の単相インバータを備え、前記単相インバータを直列接続し出力電圧指令に基づいて３相交流出力電圧を生成し交流電動機を駆動する直列多重インバータにおいて、前記３相交流入力電圧を検出し入力電圧検出信号を生成する入力電圧検出部と、前記３相交流出力電圧を検出し出力電圧検出信号を生成する出力電圧検出部と、前記入力電圧検出信号と前記出力電圧検出信号をそれぞれ直流入力電圧信号と直流出力電圧信号に変換する直流電圧変換部と、前記直流入力電圧信号と前記直流出力電圧信号に基づいて過電圧を防止する過電圧防止部と、を備えることを特徴とするものである。
請求項２に記載の発明は、請求項１記載の直列多重インバータにおいて、前記直流電圧変換部は、入力電圧検出信号から入力電圧信号を生成し、前記入力電圧信号から直流電圧指令を生成し、前記出力電圧検出信号と前記出力電圧指令との比を前記直流電圧指令に乗じて直流電圧を生成することを特徴とするものである。
請求項３に記載の発明は、請求項１記載の直列多重インバータにおいて、前記直流電圧変換部は、出力電圧検出信号を前記出力電圧指令の比を各相ごとに生成し、それぞれに前記直流電圧指令を乗じて各相ごとの直流電圧を生成することを特徴とするものである。
請求項４に記載の発明は、請求項１記載の直列多重インバータにおいて、前記直流電圧変換部は、直流電圧を３相電圧の自乗和平方根により生成することを特徴とするものである。
請求項５に記載の発明は、請求項１記載の直列多重インバータにおいて、前記直流電圧変換部は、直流電圧を３相電圧のｄｑ軸座標変換により生成することを特徴とするものである。
請求項６に記載の発明は、請求項１記載の直列多重インバータにおいて、前記過電圧防止部は、前記出力電圧信号が所定の電圧以上でモータの減速率を前記入力電圧直流信号と前記出力電圧直流信号の関数で抑えることを特徴とするものである。
請求項７に記載の発明は、３相入力交流電圧から複数の３相出力交流電圧を生成するトランスと、前記３相出力交流電圧から単相交流電圧を生成する複数の単相インバータを備え、前記単相インバータを直列接続し出力電圧指令に基づいて３相出力交流電圧を生成しモータを駆動する直列多重インバータの過電圧防止方法において、前記３相入力交流電源の電圧を検出し入力電圧検出信号を生成するステップと、前記３相出力交流電源の電圧を検出し出力電圧検出信号を生成するステップと、前記入力電圧検出信号と前記出力電圧検出信号をそれぞれ入力電圧直流信号と出力電圧直流信号に変換するステップと、前記入力電圧直流信号と前記出力電圧直流信号に基づいて過電圧を防止するステップと、を備えたことを特徴とするものである。
In order to solve the above problem, the present invention is as follows.
The invention according to claim 1 includes a transformer that generates a plurality of three-phase AC output voltages from a three-phase AC input voltage, and a plurality of single-phase inverters that generate a single-phase AC voltage from the three-phase AC output voltage. An input voltage for detecting the three-phase AC input voltage and generating an input voltage detection signal in a serial multiple inverter that connects the single-phase inverters in series and generates a three-phase AC output voltage based on an output voltage command to drive an AC motor. A detection unit; an output voltage detection unit that detects the three-phase AC output voltage and generates an output voltage detection signal; and converts the input voltage detection signal and the output voltage detection signal into a DC input voltage signal and a DC output voltage signal, respectively. A DC voltage conversion unit that performs the above operation, and an overvoltage prevention unit that prevents overvoltage based on the DC input voltage signal and the DC output voltage signal.
According to a second aspect of the present invention, in the serial multiple inverter according to the first aspect, the DC voltage conversion unit generates an input voltage signal from the input voltage detection signal, generates a DC voltage command from the input voltage signal, The DC voltage command is generated by multiplying the DC voltage command by the ratio of the output voltage detection signal and the output voltage command.
According to a third aspect of the present invention, in the serial multiple inverter according to the first aspect, the DC voltage converter generates an output voltage detection signal for each phase of a ratio of the output voltage command, and each of the DC voltage converters A DC voltage for each phase is generated by multiplying the command.
According to a fourth aspect of the present invention, in the serial multiple inverter according to the first aspect, the DC voltage conversion unit generates a DC voltage by a square sum of squares of three-phase voltages.
According to a fifth aspect of the present invention, in the serial multiple inverter according to the first aspect, the DC voltage converter generates the DC voltage by dq-axis coordinate conversion of a three-phase voltage.
According to a sixth aspect of the present invention, in the serial multiple inverter according to the first aspect, the overvoltage prevention unit determines a motor deceleration rate when the output voltage signal is equal to or higher than a predetermined voltage and the input voltage direct current signal and the output voltage direct current. It is characterized by being suppressed by a signal function.
The invention according to claim 7 includes a transformer that generates a plurality of three-phase output AC voltages from a three-phase input AC voltage, and a plurality of single-phase inverters that generate a single-phase AC voltage from the three-phase output AC voltage, In the method for preventing overvoltage of a serial multiple inverter in which the single-phase inverters are connected in series and a three-phase output AC voltage is generated based on an output voltage command to drive a motor, an input voltage detection signal Generating the output voltage detection signal by detecting the voltage of the three-phase output AC power source, and converting the input voltage detection signal and the output voltage detection signal into an input voltage DC signal and an output voltage DC signal, respectively. A step of converting, and a step of preventing overvoltage based on the input voltage DC signal and the output voltage DC signal.
本発明によれば、各単相インバータの直流電圧検出回路を設けることなく、入力電圧と出力電圧の検出値から直流電圧を算出するので過電圧の発生を防止する直列多重インバータと過電圧防止方法を提供できる。 According to the present invention, there is provided a serial multiple inverter and an overvoltage prevention method for preventing the occurrence of overvoltage because the DC voltage is calculated from the detected values of the input voltage and the output voltage without providing a DC voltage detection circuit for each single-phase inverter. it can.
以下、本発明の方法の具体的実施例について、図１〜５に基づいて説明する。 In the following, specific examples of the method of the present invention will be described with reference to FIGS.
図１は、本発明の方法を実施する直列多重インバータ装置の構成を示す回路図である。図１において三相交流電源１０１が三相トランス１０２の１次巻線１２０の端子Ｒ，Ｓ，Ｔに入力されている。前記三相トランスの２次巻線１２１〜１２９から各単相インバータ１３１〜１３３、１４１〜１４３、１５１〜１５３に電力を供給している。前記単相インバータを３台一組としてその出力を直列に接続し、Ｕ相、Ｖ相、Ｗ相を構成し、高圧交流電圧を発生し、交流電動機１０７を駆動している。 FIG. 1 is a circuit diagram showing a configuration of a serial multiple inverter apparatus for carrying out the method of the present invention. In FIG. 1, a three-phase AC power source 101 is input to terminals R, S, and T of a primary winding 120 of a three-phase transformer 102. Electric power is supplied to the single-phase inverters 131 to 133, 141 to 143, and 151 to 153 from the secondary windings 121 to 129 of the three-phase transformer. A set of three single-phase inverters are connected in series, the U-phase, the V-phase, and the W-phase are formed, a high-voltage AC voltage is generated, and the AC motor 107 is driven.
前記１次巻線に入力される電圧を入力電圧検出回路１０６を用いて検出する。出力側も同様に出力電圧検出回路１０９を用いて検出し、前記入力電圧検出値とともに直流電圧演算回路１０８に入力する。前記直流電圧演算回路にて算出した直流電圧値を過電圧防止回路１１０に入力し、過電圧防止を行う。 A voltage input to the primary winding is detected using an input voltage detection circuit 106. Similarly, the output side is also detected using the output voltage detection circuit 109 and input to the DC voltage calculation circuit 108 together with the input voltage detection value. The DC voltage value calculated by the DC voltage calculation circuit is input to the overvoltage prevention circuit 110 to prevent overvoltage.
図２は、本発明の方法の実施形態１を示す直流電圧演算回路である。出力電圧Ｖｏｕｔは、出力電圧指令Ｖｒｅｆに対して、次式で表される。
Ｖｏｕｔ＝Ｖｒｅｆ×Ｖｄｃ／Ｖｄｃｒｅｆ （１）
ここで、Ｖｄｃは実際の直流電圧値、Ｖｄｃｒｅｆは、入力電圧Ｖｉｎから演算される直流電圧指令である。前記三相トランスの巻線比を
とすると直流電圧指令は次式にて演算される。
Ｖｄｃｒｅｆ＝１．３５×ａ×Ｖｉｎ （２）
以上から、直流電圧は既知の数値を用いて次式にて演算できる。
Ｖｄｃ＝Ｖｄｃｒｅｆ×Ｖｏｕｔ／Ｖｒｅｆ （３）
FIG. 2 is a DC voltage calculation circuit showing the first embodiment of the method of the present invention. The output voltage Vout is expressed by the following equation with respect to the output voltage command Vref.
Vout = Vref × Vdc / Vdcref (1)
Here, Vdc is an actual DC voltage value, and Vdcref is a DC voltage command calculated from the input voltage Vin. The winding ratio of the three-phase transformer
Then, the DC voltage command is calculated by the following equation.
Vdcref = 1.35 × a × Vin (2)
From the above, the DC voltage can be calculated by the following equation using known numerical values.
Vdc = Vdcref × Vout / Vref (3)
（３）式を使って直流電圧を演算するため、まず、入力電圧Ｖｒ、Ｖｓ、Ｖｔを入力電圧検出部１０６を介して取り込み、入力電圧演算部２０１にて入力電圧Ｖｉｎを演算し、その値から直流電圧指令生成部２０２により直流電圧指令Ｖｄｃｒｅｆを生成する。次に、出力電圧Ｖｕ、Ｖｖ、Ｖｗを出力電圧検出部１０９を介して取り込み、出力電圧演算部２０３にて出力電圧Ｖｏｕｔを演算し出力電圧指令Ｖｒｅｆとの比を演算し、先に演算した直流電圧指令Ｖｄｃｒｅｆと乗ずることで直流電圧Ｖｄｃを算出する。 In order to calculate the DC voltage using the equation (3), first, the input voltages Vr, Vs, and Vt are taken in via the input voltage detector 106, the input voltage Vin is calculated by the input voltage calculator 201, and the value The DC voltage command generator 202 generates a DC voltage command Vdcref. Next, the output voltages Vu, Vv, and Vw are taken in via the output voltage detection unit 109, the output voltage calculation unit 203 calculates the output voltage Vout, calculates the ratio with the output voltage command Vref, and the previously calculated DC The DC voltage Vdc is calculated by multiplying the voltage command Vdcref.
図４は、本発明の実施例１の過電圧防止回路である。直流電圧算出値が直流電圧指令を超えると回生エネルギーが発生していることになるので回生エネルギーを抑制するために減速レートを緩くする。ここでは、前記直流電圧演算値が直流電圧指令を超えた量に応じて減速レートを緩くするための補正係数を演算する。ここでは、減速レートを緩くするための係数を演算しているが、直流電圧の上昇量に応じて回生側のトルク制限値を小さくすることでも同様に過電圧を防止することが可能である。 FIG. 4 shows an overvoltage prevention circuit according to the first embodiment of the present invention. When the DC voltage calculation value exceeds the DC voltage command, regenerative energy is generated. Therefore, the deceleration rate is reduced in order to suppress the regenerative energy. Here, a correction coefficient for reducing the deceleration rate is calculated according to the amount by which the DC voltage calculation value exceeds the DC voltage command. Here, although a coefficient for reducing the deceleration rate is calculated, overvoltage can be similarly prevented by reducing the torque limit value on the regeneration side in accordance with the amount of increase in DC voltage.
図３は、本発明の方法の実施例２を示す直流電圧変換回路である。インバータが出力する３相電圧Ｖｕ、Ｖｖ、Ｖｗは、３相電圧指令Ｖｕｒｅｆ、Ｖｖｒｅｆ、Ｖｗｒｅｆに対して次式にて表される。
Ｖｕ＝Ｖｕｒｅｆ×Ｖｄｃｕ／Ｖｄｃｒｅｆ
Ｖｖ＝Ｖｖｒｅｆ×Ｖｄｃｖ／Ｖｄｃｒｅｆ
Ｖｗ＝Ｖｗｒｅｆ×Ｖｄｃｗ／Ｖｄｃｒｅｆ （４）
Ｖｄｃｒｅｆは（２）式にて演算されるので、各相の直流電圧値、Ｖｄｃｕ、Ｖｄｃｖ、Ｖｄｃｗは次式により演算できる。
Ｖｄｃｕ＝Ｖｄｃｒｅｆ×Ｖｕ／Ｖｕｒｅｆ
Ｖｄｃｖ＝Ｖｄｃｒｅｆ×Ｖｖ／Ｖｖｒｅｆ
Ｖｄｃｗ＝Ｖｄｃｒｅｆ×Ｖｗ／Ｖｗｒｅｆ （５）
FIG. 3 is a DC voltage conversion circuit showing Embodiment 2 of the method of the present invention. The three-phase voltages Vu, Vv, and Vw output from the inverter are expressed by the following equations with respect to the three-phase voltage commands Vuref, Vvref, and Vwref.
Vu = Vuref × Vdcu / Vdref
Vv = Vvref × Vdcv / Vdref
Vw = Vwref × Vdcw / Vdcref (4)
Since Vdref is calculated by equation (2), the DC voltage value of each phase, Vdcu, Vdcv, Vdcw can be calculated by the following equation.
Vdcu = Vdref × Vu / Vuref
Vdcv = Vdref × Vv / Vvref
Vdcw = Vdcref × Vw / Vwref (5)
（５）式を使って直流電圧を演算するため、まず、入力電圧Ｖｒ、Ｖｓ、Ｖｔを入力電圧検出部１０６を介して取り込み、入力電圧演算部３０１にて入力電圧Ｖｉｎを演算し、直流電圧指令生成部３０２により直流電圧指令Ｖｄｃｒｅｆを生成する。次に、出力電圧Ｖｕ、Ｖｖ、Ｖｗを出力電圧検出回路１０９を介して取り込み、各相電圧検出値Ｖｕ、Ｖｖ、Ｖｗと各相電圧指令Ｖｕｒｅｆ、Ｖｖｒｅｆ、Ｖｗｒｅｆとの比を演算し、先に演算した直流電圧指令Ｖｄｃｒｅｆを乗ずることで各相の直流電圧Ｖｄｃｕ、Ｖｄｃｖ、Ｖｄｃｗを算出する。 In order to calculate the DC voltage using the equation (5), first, the input voltages Vr, Vs, and Vt are taken in via the input voltage detector 106, the input voltage Vin is calculated by the input voltage calculator 301, and the DC voltage is calculated. The command generation unit 302 generates a DC voltage command Vdcref. Next, the output voltages Vu, Vv, and Vw are taken in via the output voltage detection circuit 109, and the ratio between each phase voltage detection value Vu, Vv, Vw and each phase voltage command Vuref, Vvref, Vwref is calculated. The DC voltage Vdcu, Vdcv, Vdcw of each phase is calculated by multiplying the calculated DC voltage command Vdref.
図５は、本発明の方法の実施例２を示す過電圧防止回路である。前記各相の直流電圧のうち最大値選択回路５０２により一番上昇値が大きい相を選択し、その値を用いて過電圧防止処理を行う。過電圧防止回路５０１については、実施例１にて記載したものと同様である。直流電圧を相毎に演算することで各相のばらつきに対する過電圧防止効果を大きくすることができる。 FIG. 5 is an overvoltage prevention circuit showing Embodiment 2 of the method of the present invention. Of the DC voltages of each phase, the maximum value selection circuit 502 selects the phase having the largest increase value, and the overvoltage prevention process is performed using the value. The overvoltage prevention circuit 501 is the same as that described in the first embodiment. By calculating the DC voltage for each phase, it is possible to increase the effect of preventing overvoltage against variations in each phase.
直流電圧に変換するには、（６）式のように３相電圧の自乗和平方根をもとめてもよい。
Ｖｉｎ＝√（Ｖｒ２＋Ｖｓ２＋Ｖｔ２）
Ｖｏｕｔ＝√（Ｖｕ２＋Ｖｖ２＋Ｖｗ２） （６）
また、直流電圧に変換するには、（７）式のようにｄｑ軸座標変換などの座標変換を用いてもよい。ここでθはモータロータの電気角である。
In order to convert to a DC voltage, the square sum of squares of the three-phase voltage may be obtained as shown in Equation (6).
Vin = √ (Vr 2 + Vs 2 + Vt 2 )
Vout = √ (Vu 2 + Vv 2 + Vw 2 ) (6)
Moreover, in order to convert into a DC voltage, you may use coordinate transformations, such as dq axis coordinate transformation, like (7) Formula. Where θ is the electrical angle of the motor rotor.
図７は本発明の過電圧防止方法を示すフローチャートである。図７において、ステップＳＴ１で３相入力交流電源の電圧を検出し入力電圧検出信号を生成し、ステップＳＴ２で３相出力交流電源の電圧を検出し出力電圧検出信号を生成し、ステップＳＴ３で入力電圧検出信号と出力電圧検出信号をそれぞれ入力電圧直流信号と出力電圧直流信号に変換し、ステップＳＴ４で入力電圧直流信号と出力電圧直流信号に基づいて過電圧を防止する。 FIG. 7 is a flowchart showing the overvoltage prevention method of the present invention. In FIG. 7, in step ST1, the voltage of the three-phase input AC power supply is detected and an input voltage detection signal is generated. In step ST2, the voltage of the three-phase output AC power supply is detected and an output voltage detection signal is generated, and input in step ST3. The voltage detection signal and the output voltage detection signal are converted into an input voltage DC signal and an output voltage DC signal, respectively, and overvoltage is prevented based on the input voltage DC signal and the output voltage DC signal in step ST4.
このように、入力電圧と出力電圧の検出値から直流電圧値を算出することで過電圧を防止することが可能となり、単相インバータ毎に直流電圧を検出するための回路を設ける必要がなく、安価で簡素な回路構成で過電圧の防止ができるのである。 Thus, by calculating the DC voltage value from the detected values of the input voltage and output voltage, it becomes possible to prevent overvoltage, and it is not necessary to provide a circuit for detecting the DC voltage for each single-phase inverter, and it is inexpensive. Thus, overvoltage can be prevented with a simple circuit configuration.
１０１ 三相交流電源
１０２ 三相トランス
１０３ Ｕ相ユニット
１０４ Ｖ相ユニット
１０５ Ｗ相ユニット
１０６ 入力電圧検出部
１０７ 交流電動機
１０８ 直流電圧変換部
１０９ 出力電圧検出部
１１０ 過電圧防止部
１２０ １次巻線
１２１〜１２９ ２次巻線
１３１〜１５３ 単相インバータ
Ｒ，Ｓ，Ｔ 三相トランス１次側入力端子
ｒ，ｓ，ｔ 単相インバータ入力端子
ａ，ｂ 単相インバータ出力端子
Ｕ，Ｖ，Ｗ 出力端子
２０１ 入力電圧演算部
２０２ 直流電圧指令生成部
２０３ 出力電圧演算部
３０１ 入力電圧演算部
３０２ 直流電圧指令生成部
４０１ 過電圧防止部
５０１ 過電圧防止部
５０２ 最大値選択部
101 Three-phase AC power supply 102 Three-phase transformer 103 U-phase unit 104 V-phase unit 105 W-phase unit 106 Input voltage detection unit 107 AC motor 108 DC voltage conversion unit 109 Output voltage detection unit 110 Overvoltage prevention unit 120 Primary winding 121- 129 Secondary windings 131 to 153 Single-phase inverters R, S, T Three-phase transformer primary side input terminals r, s, t Single-phase inverter input terminals a, b Single-phase inverter output terminals U, V, W Output terminal 201 Input voltage calculation unit 202 DC voltage command generation unit 203 Output voltage calculation unit 301 Input voltage calculation unit 302 DC voltage command generation unit 401 Overvoltage prevention unit 501 Overvoltage prevention unit 502 Maximum value selection unit
Claims (7)
前記３相交流入力電圧を検出し入力電圧検出信号を生成する入力電圧検出部と、
前記３相交流出力電圧を検出し出力電圧検出信号を生成する出力電圧検出部と、
前記入力電圧検出信号と前記出力電圧検出信号をそれぞれ直流入力電圧信号と直流出力電圧信号に変換する直流電圧変換部と、
前記直流入力電圧信号と前記直流出力電圧信号に基づいて過電圧を防止する過電圧防止部と、
を備えたことを特徴とする直列多重インバータ。 A transformer that generates a plurality of three-phase AC output voltages from a three-phase AC input voltage and a plurality of single-phase inverters that generate a single-phase AC voltage from the three-phase AC output voltage, and outputs the single-phase inverter connected in series In a series multiple inverter that generates a three-phase AC output voltage based on a voltage command and drives an AC motor,
An input voltage detector that detects the three-phase AC input voltage and generates an input voltage detection signal;
An output voltage detector that detects the three-phase AC output voltage and generates an output voltage detection signal;
A DC voltage converter for converting the input voltage detection signal and the output voltage detection signal into a DC input voltage signal and a DC output voltage signal, respectively;
An overvoltage prevention unit for preventing overvoltage based on the DC input voltage signal and the DC output voltage signal;
A serial multiple inverter characterized by comprising:
前記３相入力交流電源の電圧を検出し入力電圧検出信号を生成するステップと、
前記３相出力交流電源の電圧を検出し出力電圧検出信号を生成するステップと、
前記入力電圧検出信号と前記出力電圧検出信号をそれぞれ入力電圧直流信号と出力電圧直流信号に変換するステップと、
前記入力電圧直流信号と前記出力電圧直流信号に基づいて過電圧を防止するステップと、
を備えたことを特徴とする直列多重インバータの過電圧防止方法。
A transformer that generates a plurality of three-phase output AC voltages from a three-phase input AC voltage and a plurality of single-phase inverters that generate a single-phase AC voltage from the three-phase output AC voltage, and outputs the single-phase inverter connected in series In a method for preventing overvoltage of a serial multiple inverter that generates a three-phase output AC voltage based on a voltage command and drives a motor,
Detecting the voltage of the three-phase input AC power supply and generating an input voltage detection signal;
Detecting a voltage of the three-phase output AC power supply and generating an output voltage detection signal;
Converting the input voltage detection signal and the output voltage detection signal into an input voltage DC signal and an output voltage DC signal, respectively;
Preventing overvoltage based on the input voltage DC signal and the output voltage DC signal;
A method of preventing overvoltage of a serial multiple inverter.
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| EP2849335A4 (en) * | 2012-05-11 | 2016-04-13 | Toshiba Mitsubishi Elec Inc | Dc voltage detector and power conversion device using same |
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| JP2000308205A (en) * | 1999-04-21 | 2000-11-02 | Railway Technical Res Inst | Ac electric vehicle drive apparatus |
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| EP3139488A3 (en) * | 2012-05-11 | 2017-03-15 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Dc voltage detector and power conversion device using same |
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