Simple sensorless control technique of permanent magnet synchronous generator wind turbine

This paper proposes a simple technique to get maximum power of wind energy conversion system (WECS) without using sensors for wind and rotor speed of the permanent magnet synchronous generator (PMSG). It uses the measurements of DC current and DC voltage to obtain maximum power point tracking (MPPT) by controlling the duty cycle of the DC-DC boost converter switch. Moreover, a PI control is employed to control the output voltage and current of a single-phase voltage source inverter, which is used to connect the system to the grid. In this case, the active and reactive power can be controlled independently. Using the proposed technique to get MPPT requires only the measurements of DC current and DC voltage after the uncontrolled rectifier. From these measurements of the DC voltage and current, the DC power can be calculated easily and thus the MPP can be attained. Therefore the optimum value of the power coefficient of wind turbine (Cp) can be reached. Accuracy of this technique for getting MPPT is verified through simulation results.