A new entrant to the wind turbine
market, HS Harbon & Sons, has
standardised on AC drives from Control
Techniques for two reasons: reliability
and versatility. The company’s new
turbine offers ROI in just four years.

“The HWT60 is designed to
optimise the blade power output by
changing rotor speed to reflect
changing wind conditions,” explains
Dave Harbon, technical director.

“This is why we use a variable speed
drive in regeneration mode to return
the generated power to the mains
grid. We use Control Techniques’
drives because their efficiency,
considerable programming capability
and communications give us the
precise control that we need.”
Each turbine is fitted with four AC
drives from Control Techniques.

Two small 0.5kW Unidrive SP AC
drives are fitted at the top of the
tower, one controlling yaw (to turn
the turbine into the wind) and the
other controlling the hydraulics for
the braking system.