Patent ID: 11923759
Assignee: TOSHIBA MITSUBISHI—ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. The power conversion device according to claim 1, wherein
the steps further include
calculating, for each number of pulses in a predetermined range, over a predetermined range of modulation factors, base switching patterns by calculating the switching phases so as to satisfy conditions for
ensuring the modulation factor,
eliminating the harmonic components for the respective orders of the output voltage of the inverter, and
ensuring the predetermined value for the phase difference between the predetermined adjacent two switching phases,

storing the calculated base switching patterns, for each number of pulses in the predetermined range, over the predetermined range of the modulation factors, and
reading a base switching pattern corresponding to the calculated modulation factor and the determined number of pulses, and corrects the switching phases included in the read base switching pattern so that, regarding regions where current flows to the neutral point, an absolute value of a sum of a current integral value at the neutral point in the region where a voltage difference between the positive-side capacitor and the negative-side capacitor increases and a current integral value at the neutral point in the region where the voltage difference decreases, becomes equal to or smaller than a predetermined value, thereby calculating the switching pattern.