Sensor-less Vector Control of DFIG Based Micro Wind Energy Conversion System

Among different renewable energy sources, the micro wind energy conversion system promises of reliability, cost effectiveness in rural areas where grid power is unavailable for electrification. Numerous studies on the control schemes are being conducted to generate electrical energy from the available wind energy using doubly fed induction generator (DFIG). In this study a new control strategy has been suggested. A micro wind energy conversion system has been designed with a sensor-less vector control technique to control the rotor side converter, to force the generator to operate at a constant speed irrespective of variable mechanical input torque due to variable wind speed, keeping the frequency and voltage of the output power constant. To estimate the speed and position of the rotor a model reference adaptive system (TARC-MRAS) based on two axes rotor current is proposed which is compared to the speed measured by the encoder to validate its proper execution Also the speed estimators performance will be investigated during start-up, acceleration, and deceleration of the generator to confirm its usability. A 5 hp wound type induction generator coupled with 5 kW dc motor is used for the experiment. Performance of the propose single VSC based DFIG along with a BESS and Dump load controller has been analyzed under different conditions.