A Phenomenon of Maximum Power Point Tracking Invalidity of Wind Turbines

A phenomenon of the invalidity of maximum power point tracking(MPPT) was discovered,which occurred in the MPPT stage of wind turbine systems with large inertia and wide MPPT range.Based on the analysis of equilibrium points and acceleration/deceleration regions of the simplified wind turbine model,the paper presented the mechanism explanation of the occurrence of the MPPT invalidity phenomenon that was the dynamic behavior of wind turbine was too slow to track the rapid variation of wind speed.Furthermore,the simulations of wind turbines with several capacities and statistics analysis showed that the occurrence of the MPPT invalidity phenomenon and its impacts on wind turbine efficiency could not be neglected.Especially at the wind speed conditions with high turbulence intensity,the MPPT invalidity phenomenon might reduce the captured wind power with a significant loss ratio of up to 10%.