Wind Turbine Power Coefficient Analysis of a New Maximum Power Point Tracking Technique

A small scale wind energy conversion system can track the maximum power point based on a linear relationship between Vdc2 and Idc. Unlike conventional maximum power point tracking methods using a look-up table, an advanced technique is proposed based on this relationship as a variant of the perturb and observe method. It not only has the advantages of the conventional perturb and observe method, but also has a faster tracking speed and better performance. The paper theoretically analyzes the possible power coefficient drop when using a linear relationship for maximum power point tracking, and establishes that the turbine design can ensure that the possible power coefficient drop is small. The simulation results show that the analysis is precise. The validity and performance of the proposed maximum power point tracking method is confirmed by both simulation and experimentation.