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Direct torque control (DTC) of three-phase permanent magnet brushless AC (PM BLAC) motor having one phase open-circuit fault (OPOF) is presented. Torque and flux linkages of the faulty motor are estimated by proposed estimators. Control topology, voltage vectors and design procedure are described. Simulated results show that the proposed topology can be operated under fault situation at rated torque and speed operation. Performances of the system are validated by the measured data.

Typically photovoltaic (PV) maximum power point tracking (MPPT) system concerns in PV output power at specific high solar irradiance. Poor response may be found when load side characteristic is considered particular at low solar irradiance. A novel PV MPPT scheme is present by integrating load power signal into MPPT control signal. The simulation results show that the proposed MPPT system can be operated efficiently at significantly lower solar intensity compared to those of the conventional P&O MPPT system.