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Abstract:In order to improve the speed sensorless-control system of PMSG in low speed performance, this paper introduces a novel Dead-time compensation control method .Mathematical model is established according to the Dead-zone of the influence of the voltage source type inverter output voltage. At the same time, the given value of current regulator output voltage has been fixed based on the established model. Then the stator voltage after compensationed is applied to the flux estimation, which improves the performance of flux estimation. Finally, the position and speed of the rotor is estimated based on Back-Electromotive Force, which has Simple algorithm and good robustness. In order to verify the correctness of theoretical analysis, the experiment was done according to the new control method. The results proved the correctness and feasibility of this control method. In alpha-beta coordinate system, vector induced electromotive force is defined asThe relationship between the stator flux vector and induced electromotive force vectorisThe equation (2) The calculation process of stator flux using the formula (4) ICMEE 2015According to the Fig.1,the rotor position of PMSG can be expressed as [8]