Robust predictive current control method for synchronous motor with synchronous space vector modulation

A robust predictive current control method for a synchronous motor with synchronous space vector modulation, comprising the following steps:

• S1, according to a current observation error at a current sampling time, estimating a disturbance voltage deviation, and updating an estimated value of a disturbance voltage at a previous sampling time based on the disturbance voltage deviation;
• S2, based on the estimated value of the disturbance voltage at the previous sampling time obtained by S1, calculating the estimated value of the disturbance voltage at the current sampling time, and based on the estimated value of the disturbance voltage at the current sampling time, predicting an observed value of a stator current of the synchronous motor at a next sampling time to compensate a digital delay;
• S3, based on the observed value of the stator current of the synchronous motor at the next sampling time obtained by S2, calculating a voltage drop of a stator winding of the synchronous motor at the next sampling time, and calculating an observed value of the disturbance voltage at the next sampling time based on the estimated value of the disturbance voltage at the current sampling time obtained by S2;
• S4, based on the voltage drop and the observed value of the disturbance voltage of the stator winding of the synchronous motor at the next sampling time obtained by S3, predicting a voltage command phase at the next sampling time, and calculating a preset sampling position adjacent to the voltage command phase at the next sampling time, so that a motor command phase is mapped to a discrete sampling point preset by synchronous space vector modulation (SSVM);
• S5, based on the voltage command phase calculated by S4 and the preset sampling position, calculating a sampling interval of a next control period, so that the voltage command phase is aligned with sampling points of SSVM by adjusting the control period to avoid phase deviation;
• S6, generating a voltage command based on the sampling interval of the next control period calculated based on S5;
• and
• S7, based on the voltage command obtained by S6, calculating a duty ratio of each basic voltage vector to obtain SSVM pulses.