タップ付き相間リアクトルを用いた双方向性コンバータ

概要

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As an ideal AC-DC converter for driving power source of motor, it is required to satisfy the next conditions. 1) Output DC voltage is variable continuously. 2) Regardless of the output voltage, the fundamental wave power factor is always unity. 3) Input AC current is nearly sinusoidal. 4) The apparent power factor is high as much as possible. 5) It has regenerative capability. We have realized the AC-DC converter satisfied the above conditions. In the DC output sides of two sets of three-phase bridge which differ the phase by 30 degrees via phase shifting transformer, an interphse transformer with two taps is applied. A power transistor with antiparallel diode is connected to each tap respectively. The three-phase bridges are constructed using the power transistors with antiparallel diode. When this converter is operating as the rectifier, the input AC current is a quasi-sinusoidal wave with 24 steps, and the power factor of the fundamental wave is unity. As the residual higher harmonics are only slight, the total power factor is very high. By a cascade connection of DC chopper, the output DC voltage is variable by changeing continuously the control factor. Regenerated power is passed inversely through the step-up chopper, the interphase transformer and the transister bridges. The theory and the experimental results are described.
山梨大学の論文