Sensorless DTSMC of a three-level VSI fed PMSM drive

Yousif Eldigair, Abdul R. Beig, Jamal Alsawalhi

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


This study proposes a novel sliding mode control (SMC) structure for a three-level voltage source inverter (VSI). The proposed controller is implemented in discrete time and is applied for the closed-loop speed control of permanent magnet synchronous motor (PMSM) drive powered from a three-level cascaded H-bridge VSI. The proposed discrete time SMC (DTSMC) has the distinct advantages of control over maximum switching frequency and relatively lower total harmonic distortion compared to that of a conventional hysteresis modulation (HM) control. Unlike HM, the proposed DTSMC relates the maximum switching frequency to sampling time, resulting in better utilisation of the bandwidth of the VSI. Additionally, a procedure to combine the DTSMC with a sliding mode observer to achieve sensor-less operation of the PMSM drive is presented. Verification of the proposed DTSMC is conducted using simulation and experimental tests. The simulation and experimental results are presented.

Original languageBritish English
Pages (from-to)788-797
Number of pages10
JournalIET Power Electronics
Issue number4
StatePublished - 18 Mar 2020


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