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This paper studies the modeling, switching strategy and control scheme for NPC three-level (NPC-3L) inverter fed dual-three-phase permanent magnet synchronous motor (PMSM) drives. Firstly, the dynamic modeling of the system is described and analyzed. Then, the space vector modulation (SVM) strategy is designed for the drive system under double d-q frames. Not only the harmonic performance but also...
This paper focuses on the development of an online method for diagnosing high-resistance connection (HRC) in delta-connected permanent magnet synchronous machine (PMSM) using zero-sequence current component (ZSCC). The development of this method begins with the establishment of the mathematic model of the PMSM with the HRC. Based on the model, a ZSCC-based method is proposed to diagnose the HRC. The...
This paper presents a fault diagnosis method for direct-drive wind turbine with permanent magnet synchronous generator (D-PMSG) by using generator control loop current signals. In this method, the Vold-Kalman filtering order tracking technique is used to track the fault characteristic harmonic components from q-axis current signals. Then the envelopes of amplitudes of the fault harmonic components...
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