Patent ID: 11936306
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A power conversion device comprising:
a plurality of leg circuits, each of the leg circuits including a plurality of converter cells cascaded to each other, each of the converter cells including an energy storage and a switching element;
a control device to generate, for each of the leg circuits, a first voltage command value not based on circulating current circulating between the leg circuits and a second voltage command value based on the circulating current; and
a plurality of individual controllers provided respectively corresponding to the converter cells, the individual controllers each generating a gate control signal to control turning on and off of the switching element of the corresponding converter cell, based on the first voltage command value and the second voltage command value,
each of the individual controllers including:
a comparator to generate the gate control signal using pulse width modulation by comparison between the first voltage command value and a carrier signal; and
a carrier generator to generate the carrier signal modulated by the second voltage command value such that a pulse width of the gate control signal changes in accordance with the second voltage command value.