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Sensorless Control of Current-Source-Converters Fed Synchronous Motor Drives using High Frequency Signal Injection

In this paper, a sensorless control method is proposed for a current-source-converter (CSC) fed synchronous reluctance (SyR) motor drive system. The proposed method is based on the injection of a high-frequency (HF) pulsating sinusoidal signal in the estimated synchronous reference frame of the drive’s field-oriented control (FOC) scheme. The DC-link inductor, inverter output three-phase filter capacitor of the current-source drive and the nonlinear characteristic of SyR motor lead some challenges to the design of the control method. Under the proposed FOC scheme and with the proper design of the HF signal, the accurate rotor position and speed can be estimated. Experiments results are given to verify the proposed control method.