Research and modeling about small three-phase wind turbine system using in the villages

This paper designed a small set of wind turbine system mainly using in the Chinese villages to solve the questions of lack of electric power or voltage instability, and so on. The system is wished to output qualified electric energy for those three-phase devices. The paper analyzed the wind turbine output characteristic and gained the relationships between output power and rotating angular velocity of the wind turbine. It searched for the optimal value of the rotating angular velocity, and tracked the maximum wind power with a method called changing step-size disturbance observation. The system could output the maximum electric power when the wind speed changed continuously, and it applied a low-pass filter behind the inverter to filter the harmonic generated when tracking the maximum wind power. The simulations proved that the system achieved expectant performance.