Control apparatus for duplex feeding AC unit and control method

The invention provides a control apparatus for a duplex feeding AC unit and a control method. According to an embodiment, a control apparatus includes a secondary current measurement part(CT5A) whichmeasures current on the secondary side of the duplex feeding AC machine (1), a DC component measurement part(6) which measures a direct-current component or a low-frequency component of secondary current measured by the aforementioned secondary current measurement part(CT5A), a DC command value generating part(7) which generates a signal of a direct-current energization instruction or a low frequency wave energization instruction in a power conversion control part (3) according to a direct-current component or a low-frequency component measured by the aforementioned DC component measurement part(6), and a switching part(8) which outputs or stops a signal of the aforementioned DC command value generating part(7), and the aforementioned switching part(8) outputs a signal of the aforementioned DC command value genera