Phase sequence adjustment system and phase sequence adjustment method

A phase sequence adjustment system, comprising:

• a power conversion circuit, connected to a main power supply with a phase sequence;
• and
• a control circuit, configured to provide a first excitation signal and a second excitation signal to a plurality of switches of the power conversion circuit at different time points, respectively, to perform two short-circuit operations between the power conversion circuit and the main power supply, and the control circuit comprises:
• a current detection circuit, configured to detect a first current signal corresponding to the first excitation signal and a second current signal corresponding to the second excitation signal, during the two short-circuit operations between the power conversion circuit and the main power supply;
• and
• a control unit, configured to calculate a first current phase angle and a second current phase angle, respectively, according to the first current signal and the second current signal, and the control unit is configured to select a current phase angle from the first current phase angle and the second current phase angle and correspondingly calculate a voltage phase angle of the main power supply;
• wherein,
• the control unit determines whether the phase sequence is positive or negative according to the first current phase angle and the second current phase angle, and the control unit calculates a phase angle difference between the selected current phase angle and the voltage phase angle, to adjust a feedback phase sequence of the power conversion circuit, according to the phase angle difference, to the current detection circuit.