磁気浮上式鉄道用トランスレス階調制御型インバータの零相電圧アクティブキャンセラ

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  • Active Cancellation Method for the Zero Sequence Voltage on Gradationally Controlled Voltage Inverter without Transformers for LSM, in the Maglev Line
  • ジキ フジョウシキ テツドウヨウ トランスレス カイチョウ セイギョガタ インバータ ノ ゼロソウ デンアツ アクティブ キャンセラ

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We are developing a gradationally controlled voltage inverter without output transformers for LSM in the Maglev Line. In this paper, it is first demonstrated that the gradationally controlled voltage inverter can suppress current waveform distortions with PWM control even at low frequencies in an experimental inverter model.<br>Furthermore, we propose an active cancellation method for the zero-sequence voltage which adjusts the sum of the three-phase voltages to zero giving the advantages of a small-step and flexible output voltage. We also demonstrate that the zero-sequence current was reduced to 10% in the inverter model with the active cancellation method under the experimental condition that the output filter inductance was 2mH, 1/25 the inductance of the common filter in the Yamanashi Maglev system.

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