Speed-sensorless control strategy for multi-phase induction generator in wind energy conversion systems

Abstract

Renewable energy sources, especially wind energy conversion systems (WECS), exhibit constant growth. Increase in power and installed capacity has led to ad-vances in WECS topologies. Multi-phase approach presents a new development direction with several key advantages over three-phase systems. Paired with a sensorless control strategy, multi-phase machines are expected to take primacy over standard solutions. This paper presents speed sensorless vector control of an asymmetrical six-phase induction generator based on a model reference adap-tive system. Suggested topology and developed control algorithm show that sen-sorless control can yield appropriate dynamic characteristics for the use in WECS with increase in reliability and robustness.