Power converter

A power converter for converting electric power of a three-phase electric rotary machine including a first winding set and a second winding set, the power converter comprising:

• a first inverter corresponding to the first winding set;
• a second inverter corresponding to the second winding set;
• and
• a control unit including a command calculation unit that calculates a first voltage command value related to a voltage to be applied to the first winding set and a second voltage command value related to a voltage to be applied to the second winding set, and an excess correction unit that corrects a first voltage command corresponding value corresponding to the first voltage command value and a second voltage command corresponding value corresponding to the second voltage command value, wherein:
• when one of the first voltage command corresponding value and the second voltage command corresponding value exceeds a limitation value, which is set in accordance with a voltage capable of being outputted, the excess correction unit performs an excess correction process,
• the first winding set and the second winding set have a phase difference of 30 degrees,
• in the excess correction process, the excess correction unit calculates an excess amount, which is an amount of the one of the first voltage command corresponding value and the second voltage command corresponding value that exceeds the limitation value, the excess correction unit adds an excess amount corresponding value to the other of the first voltage command corresponding value and the second voltage command corresponding value, and compensates the excess amount with the other of the first voltage command corresponding value and the second voltage command corresponding value,
• the excess correction unit performs the excess correction process on the first voltage command corresponding value and the second voltage command corresponding value, of which a neutral-point voltage is changed,
• each of the first inverter and the second inverter includes a high-potential-side switching element and a low-potential-side switching element, which provide a pair corresponding to each phase,
• the excess correction unit compares an all-phase-on period, in which the low-potential-side switching element of each phase turns on, with a two-phase-on period, in which the low-potential-side switching element of each of two phases turns on;
• and
• the excess correction unit changes the neutral-point voltage in order to detect current for one of the all-phase-on period and the two-phase-on period, which is longer than the other of the all-phase-on period and the two-phase-on period.