Sensorless output maximization control for variable-speed wind generation system using IPMSG

This paper proposes a variable-speed wind generation system using an interior permanent magnet synchronous generator (IPMSG). The armature current vector of IPMSG is optimally controlled according to the generator speed in order to maximize the generated power from wind turbine. The IPMSG is controlled by the loss-minimization control with MPPT below the base speed, which corresponds to low and medium wind speed, and the maximum energy can be captured from the wind. Above the base speed corresponding to the high wind speed region, the current and voltage limited maximum output control is applied, where the current vector is optimally controlled so that the output may become the maximum in consideration of the constraints of current and voltage. The proposed output maximization control is achieved without mechanical sensors such as wind speed sensor and position sensor. The control system has been developed and several experimental results show the effectiveness of the proposed wind generation system.