CONVERSION DEVICE

PROBLEM TO BE SOLVED: To realize continuity by correcting a discontinuous point of a voltage in a DC bus in a conversion device where AC waveforms of one cycle are alternately generated by two circuits.SOLUTION: The conversion device is interposed between a DC power source and an AC power source and comprises: the DC bus which is provided between the DC power source and the AC power source; a first converter which is provided between the DC power source and the DC bus and performs DC/DC conversion; a second converter which is provided between the DC bus and the AC power source and performs DC/AC or AC/DC conversion; and a control part which selectively operates the first converter and the second converter within one cycle of the AC power source, such that a part of an absolute value of an AC waveform and a DC waveform alternately appear as a voltage of the DC bus. The control part adds a compensation value in a positive direction to a voltage target value of the DC bus in the timing when the AC waveform and the DC waveform may come to a mutual linkage discontinuous point.SELECTED DRAWING: Figure 19 【課題】１サイクルの交流波形を２つの回路で交互に生成する変換装置において、ＤＣバスでの電圧の不連続点を修正し、連続性を実現する。【解決手段】直流電源と交流電源との間に介在する変換装置であって、直流電源と交流電源との間に設けられるＤＣバスと、直流電源とＤＣバスとの間に設けられ、ＤＣ／ＤＣ変換を行う第１変換器と、ＤＣバスと交流電源との間に設けられ、ＤＣ／ＡＣ又はＡＣ／ＤＣの変換を行う第２変換器と、第１変換器及び第２変換器を交流電源の１サイクル内で選択的に動作させることにより、ＤＣバスの電圧として、交流波形の絶対値の一部と直流波形とを交互に出現させる制御部と、を備え、制御部は、交流波形と直流波形とが相互に繋がり不連続点となるはずのタイミングで、ＤＣバスの電圧目標値に、正方向への補償値を付加する。【選択図】図１９