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Relay auto-tuning of two-stage matrix converter based PMSM drives

This paper presents the simulation research of relay auto-tuning scheme for the PI controllers of two-stage matrix converters (TSMC) based permanent magnet synchronous motor (PMSM) drives. The tuning scheme is based on the manipulation of system transfer function. TSMC, converter dead-time, electrical and mechanical characteristic of PMSM are modeled simply with transfer functions in s-domain. The relay auto-tuning scheme is employed to obtain the ultimate gain and ultimate period. The refinements of the Ziegler-Nichols tuning formula introduces the normalized gain and regulates firstly current loop and then speed loop PI controller coefficients. The tuning of the drive system is simulated both in s-domain and real-time model. Simulation results verify the performance of tuning for speed control.