| 摘要 |
PURPOSE:To improve the control performance by correcting the phase input of a converter with a voltage drop corresponding value due to a load current of a DC reactor, thereby non-interfering the load current with respect to a circulating current. CONSTITUTION:A circulating current type cycloconverter CC has positive and negative group converters SS-P and SS-N, and energizes through DC reactors LP, LN a load LOAD. The circulating current is flowed between positive and negative group converters SS through a DC reactor L, and controlled by an error signal epsilonc. In this case, DC reactors LP1, LN1 and LP2, LN2 which are not magnetically coupled are used as the reactor L. A noninterference unit 10 is formed of a compensator 11, a polarity discriminator 13 and a switch circuit 13 having switches SWP, SWN, and a voltage compensation signal is fed to adders A3, A4. Thus, a voltage drop by the load current of the reactor L is compensated, and the circulating current is not affected by the load current. |
