Power converting apparatus generating a carrier having a waveform in which an absolute value of a slope is constant with respect to time, based on a value for internally dividing amplitude of the waveform into first and second values

A power converting apparatus, comprising:

• three input terminals respectively receiving phase voltages;
• three output terminals;
• a direct converter including
• a first set of three switch devices provided between a first one of said output terminals and said three input terminals,
• a second set of three switch devices provided between a second one of said output terminals and said three input terminals, and
• a third set of three switch devices provided between a third one of said output terminals and said three input terminals;
• a carrier generating unit generating a carrier having a waveform in which an absolute value of a slope is constant with respect to time, with a reference internally dividing an amplitude of said waveform into a first value and a second value, said first and second values being current conduction rates;
• and
• a control unit configured to output a third switch signal to said first, second and third sets of switch devices, said third switch signal being computed by performing matrix transform on a first switch signal and a second switch signal, said control unit being configured with first and second virtual DC power supply lines, a virtual converter and a virtual inverter,
• the virtual converter including
• a first set of three virtual switch devices connected between said first virtual DC power supply line and said input terminals, and
• a second set of three virtual switch devices connected between said second virtual DC power supply line and said input terminals,
• the virtual inverter including
• a first set of three virtual switch devices connected between said first virtual DC power supply line and said output terminals, and
• a second set of three virtual switch devices connected between said second DC power supply line and said output terminals,
• said first switch signal performing commutation of said virtual converter at a timing at which said carrier takes said reference;
• and
• said second switch signal allowing adoption of a zero voltage vector as a switching mode of said virtual inverter in a period in which said carrier changes a first command value to a second command value, where
• said first command value internally dividing a region from said reference to a maximum value of said carrier at a ratio between a third value and a fourth value, and
• said second command value internally dividing a region from a minimum value of said carrier to said reference at a ratio between said third value and said fourth value,
• said third value being an output voltage command, and said fourth value being obtained by subtracting said voltage command from said amplitude of said carrier.