High Performance Sensorless Control of Dual Three-phase Permanent Magnet Synchronous Starter-Generator

To achieve sensorless control under all operating conditions, the sensorless compound control strategy is proposed for the dual three-phase permanent magnet synchronous starter-generator (DTPMSSG) in this paper. When the DTPMSSG operates as a motor, the sensorless control based on high-frequency square wave injection is used for lowspeed range, and the improve sliding mode observer (SMO) is applied to medium-speed sensorless control. During the DTPMSSG switches from the motor mode to the generator mode, the zero-voltage pulse injection is adopted, which solves the problem of the SMO can't estimate the rotor position due to the PWM off. When the PMSSG operates as a generator, the sliding mode observer based on adaptive proportional integral vector control (APIV-SMO) is proposed to solve the phase delay of low-pass filter (LPF) under high-speed operating conditions. The simulation and experimental results show that the proposed sensorless compound control strategy can achieve sensorless control of DTPMSSG under all operation conditions.