Common-mode voltage adjustment method and apparatus, and control system

A common-mode voltage adjustment apparatus, comprising:

• a controller;
• and
• an inverter circuit,
• wherein the controller is configured to:
• generate an injection instruction of a first common-mode voltage based on a first modulation scheme, wherein the injection instruction of the first common-mode voltage is used to control the inverter circuit to output the first common-mode voltage;
• generate an injection instruction of a second common-mode voltage based on a second modulation scheme, wherein the injection instruction of the second common-mode voltage is used to control the inverter circuit to output the second common-mode voltage;
• and
• generate an injection instruction of a third common-mode voltage based on the injection instruction of the first common-mode voltage and the injection instruction of the second common-mode voltage during a modulation scheme switching period, wherein the injection instruction of the third common-mode voltage is used to control the inverter circuit to output the third common-mode voltage, the third common-mode voltage is between the first common-mode voltage and the second common-mode voltage at any moment in the modulation scheme switching period, and the third common-mode voltage is converted into the second common-mode voltage from the first common-mode voltage or converted into the first common-mode voltage from the second common-mode voltage;
• and
• the inverter circuit is configured to:
• receive the injection instruction of the third common-mode voltage;
• and
• output the third common-mode voltage,
• wherein the first modulation scheme is continuous modulation, and the second modulation scheme is discontinuous modulation.