POWER CONVERSION DEVICE

To provide a power conversion device capable of suppressing a current flowing in a filter even in a case where a converter circuit side phase and an inverter circuit side phase are deviated from each other at two-phase modulation, and of improving the power conversion efficiency without increasing a...

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Hauptverfasser: KOHATA MASARU, YANAGISAWA MINORU
Format: Patent
Sprache:eng ; jpn
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Beschreibung
Zusammenfassung:To provide a power conversion device capable of suppressing a current flowing in a filter even in a case where a converter circuit side phase and an inverter circuit side phase are deviated from each other at two-phase modulation, and of improving the power conversion efficiency without increasing a size of the device.SOLUTION: A power conversion device 1 comprises: a converter circuit C connected with a three-phase AC power supply 91 to convert an AC of the three-phase AC power supply 91 into a DC; a smoothing circuit S connected with DC output terminals 42a and 42b of the converter circuit C, consisting of a capacitor; an inverter circuit I connected with DC terminals 61a and 62b of the smoothing circuit S to convert a DC of the smoothing circuit S into an AC and output the AC to an AC load 92; a converter controller 12 that performs PWM control of the converter circuit C by the two-phase modulation system; and an inverter controller 13 that performs PWM control of the inverter circuit I by the two-phase modulation system. The converter controller 12 performs PWM control of the converter circuit C by the two-phase modulation system by using a two-phase modulation signal for two-phase modulation used by the inverter controller 13.SELECTED DRAWING: Figure 1A 【課題】二相変調時にコンバータ回路側とインバータ回路側の位相がずれた場合でも、フィルタに流れる電流を抑制でき、装置を大型化せずに電力変換の効率を向上可能な電力変換装置を提供する。【解決手段】電力変換装置1は、三相交流電源91に接続され、三相交流電源91の交流を直流に変換するコンバータ回路Cと、コンバータ回路Cの直流出力端子42a、42bに接続され、コンデンサからなる平滑回路Sと、平滑回路Sの直流端子61a、62bに接続され、平滑回路Sの直流を交流に変換して交流負荷92に出力するインバータ回路Iと、コンバータ回路Cを二相変調方式によりPWM制御するコンバータ制御部12と、インバータ回路Iを二相変調方式によりPWM制御するインバータ制御部13と、を備える。コンバータ制御部12は、インバータ制御部13で用いる二相変調用の二相変調用信号を用いてコンバータ回路Cの二相変調方式によるPWM制御を行う。【選択図】図1A