Patent ID: 8711589

Claim:
A method for controlling a direct converting apparatus, said direct converting apparatus comprising: a converter rectifying multi-phase AC voltages by a pulse-width modulation and outputting them to a pair of DC power supply lines; and a first inverter and a second inverter being connected in parallel with each other between said pair of DC power supply lines, each of them being operated in a pulse-width modulation according to an instantaneous space vector control, said method comprising: causing a commutation in said converter when a converter carrier takes the value of a converter command value, one cycle of said converter carrier being divided by a first value and a second value into a first time period and a second time period at a timing when said commutation is caused; adopting a zero vector in a first commutation zero vector time period which is a time period including said timing, as instantaneous space vectors adopted for said instantaneous space vector control of said first inverter; adopting a zero vector in a second commutation zero vector time period which is a time period including said timing, as instantaneous space vectors used for said instantaneous space vector control of said second inverter; in said first time period, adopting, M-times (M is an integer equal to or greater than 1), an arrangement pattern of said instantaneous space vectors in said first inverter except said zero vector adopted in said first commutation zero vector time period; and in said first time period, adopting, N-times (N is an integer equal to or greater than 2, and different from said M), an arrangement pattern of said instantaneous space vectors in said second inverter except said zero vector adopted in said second commutation zero vector time period.