Sensorless Control of PMSM In A Gravity Energy Storage System Accounting for Nonlinear Inverter

In order to achieve precise sensorless control of permanent magnet synchronous motors(PMSM) in the gravity energy storage technology, a control method based on sliding mode observer and compensation measures accounting for inverter dead time effect is proposed in this paper. Firstly, sliding mode observer is integrated into the control model of PMSM. Secondly, considering the control system of PMSM with dead time effect, an adaptive notch filter(ANF) with orthogonal phase-locked loop is put in for dead time compensation. Finally, taking PMSM system with/without dead time compensation as an example, simulation comparisons were conducted on two models. The results show that the compensation method based on ANF with orthogonal phase-locked loop has a good compensation effect and is more conducive to the optimization design of PMSM.