High performance VOC-FOC based wind generator system with induction machine

This paper presents a high performance wind generator with induction machine. A back-to-back configuration with two voltage source converters has been considered, one on the machine side and the other on the grid side. Each converter has been controlled with a high performance vector control technique, respectively Field Oriented Control (FOC) and Voltage Oriented Control (VOC). A test setup has been built for the experimental assessment of the methodology. Two DSPs have been used to control both the inverters, while the wind turbine has been experimentally emulated with a Permanent Magnet Synchronous Machine (PMSM) drive, controlled in torque, which instantaneously receives the torque reference signal by the DSP on which the wind turbine model runs. Experimental results show the correct behavior of the wind turbine emulator, which permits to consider also the variation of the wind speed and the pitch blade angle, as well as the high performance of the wind generation system which is able to cover quickly any variation of the turbine torque, rapidly generating active power without reactive power exchange with the grid. Future works will regard the integration of the control technique with proper MPPT (Maximum Power Point Tracking) methodologies.