Dual SOGI-Network Based Current Ripple and Position Error Fluctuation Elimination for PMSM Sensorless Drives

Inhalt:
The current ripples and position error fluctuations caused by inverter nonlinearities and flux spatial harmonics degrade the control performance for the position sensorless interior permanent magnet machine (IPMSM) drives. A dual second-order general integrator (SOGI) harmonic decoupling network (HDN) based compensation scheme is proposed and developed. A set of SOGI-HDN is adopted to track the position and speed information, eliminating the 6th position error fluctuation; and meanwhile, another set of SOGI-HDN is utilized to detect the voltage error in time, which is added to the output as a feedforward term for compensating the inverter nonlinearities, reducing the 6th d-q-axis current ripples and improving the dynamic performance. Comparative results on a 2.2-kW IPMSM drive verified the effectiveness of the proposed dual SOGI-HDN on eliminating the current ripples and position error fluctuations.