A review of state-of-the-art in torque generation and control of floating vertical-axis wind turbines

Abstract

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Intracycle RPM control for vertical axis wind turbines

“…VAWTs are an attractive design solution for capturing energy in urban and offshore locations due to their independence to the incoming wind direction, thus eliminating the need for a yaw control mechanism. Despite such advantages, historically large‐scale Darrieus VAWTs (e.g., the Sandia 34 m) employ stall control where stalling is intentionally induced at high wind speeds to modulate the turbine power production, turbine loads, and prevent rotor overspeeding as an alternative to conventional pitch control 9–12 . The highest ever measured for a VAWT is the SANDIA 34 m Darrieus VAWT to produce a of 0.43 12 .…”

“…Despite such advantages, historically large-scale Darrieus VAWTs (e.g., the Sandia 34 m) employ stall control where stalling is intentionally induced at high wind speeds to modulate the turbine power production, turbine loads, and prevent rotor overspeeding as an alternative to conventional pitch control. [9][10][11][12] The highest C P ever measured for a VAWT is the SANDIA 34 m Darrieus VAWT to produce a C P of 0.43. 12 HAWT pitch control has been studied extensively and is a standard control feature in the HAWT industry.…”