Improved MPPT Control Based on the Reduction of Tracking Range

To overcome the difficulty of obtaining optimal adjustment conditions in the improved methods based on the regulation of electromagnetic torque,this paper proposed a novel idea for improving the conventional power signal feedback control,in which the performance of maximum power point tracking(MPPT) of wind turbines was optimized by reducing the tracking range of rotor speed and accordingly decreasing the tracking distance.And,based on this idea,an improved power signal feedback control was presented,in which the lowest rotor speed for power generation was periodically regulated according to mean wind speed.In essence,the average value of wind speed just indicated the area where the wind and wind energy were centrally distributed.Therefore,an optimal tracking range of rotor speed could be easily estimated without any iterative search because of its quantitative relationship to mean wind speed.Compared with the improvements based on the regulation of electromagnetic torque,the improved method proposed in this paper not only enhances the efficiency of wind energy capture but also is simple and easy to be implemented.Finally,simulation studies on simulated wind speed series were presented to verify the effectiveness and advantage of this improved method.