Single-Phase Converter Control Method and Apparatus

A single-phase converter control apparatus, comprising:

• a common-mode modulated-wave change rate calculation circuit configured to calculate on a voltage corresponding to a first level from a single-phase converter, a voltage corresponding to a second level from the single-phase converter, and a voltage reference value about the voltage corresponding to the first level and the voltage corresponding to the second level to obtain a common-mode modulated-wave change rate of the single-phase converter, the first level being a direct-current-side positive-bus level, and the second level being a direct-current-side negative-bus level;
• a common-mode modulated wave calculation circuit coupled to the common-mode modulated-wave change rate calculation circuit and configured to calculate a first-phase initial modulated wave of the single-phase converter, a second-phase initial modulated wave of the single-phase converter, and the common-mode modulated-wave change rate to obtain a common-mode modulated wave of the single-phase converter, both the first-phase initial modulated wave and the second-phase initial modulated wave being sinusoidal waves, and a sum of an amplitude of the first-phase initial modulated wave at any moment and an amplitude of the second-phase initial modulated wave at the same moment being zero;
• a pulse width modulated wave calculation circuit coupled to the common-mode modulated wave calculation circuit and configured to calculate on the first-phase initial modulated wave, the second-phase initial modulated wave, and the common-mode modulated wave to obtain a pulse width modulated wave of the single-phase converter;
• and
• a carrier modulation circuit coupled to the pulse width modulated wave calculation circuit and configured to output a drive signal to the single phase converter based on the pulse width modulated wave to control the single-phase converter to output different voltages.