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This paper presents the improvement of a low cost saliency-based sensorless drive with a single dc-link current sensor for interior permanent-magnet synchronous machines. The phase currents, reconstructed by the single dc-link current sensor, usually suffer from a significant reconstruction error. This paper analyzes this reconstruction error, especially when applying sensorless drive technique based...
In a weak grid condition, the precise grid impedance estimation is essential to guaranty the high performance current control and power transfer for a grid-connected inverter. This paper proposes a precise estimation method for grid impedance by P-Q variations employing a decoupled injection of reference currents. The operation principle of grid impedance estimation is fully presented, and the negative...
This paper proposes a novel soft-switched auxiliary resonant circuit to provide a Zero-Voltage-Transition turn-on switching for a conventional PWM boost converter in a PFC application. The proposed auxiliary circuit enables a main switch of the boost converter to turn on under a zero voltage switching conduction and simultaneously achieves both soft switched turn-on and turn-off. Moreover, for the...
This paper proposes the novel control method using two dc-link current sensors for parallel three-phase boost converters. In order to achieve current reconstruction for two parallel three-phase boost converters, the novel current reconstruction method is introduced in this paper. These parallel converters can be used for most medium and high power application at low cost. Simulation results will be...
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