The turbine, unveiled exclusively by Windpower Monthly in April, comprises four V29-225kW turbines attached to a central tower.
It features two nacelle operational levels with a cylindrical tower section in between and 30.5-metre height interspacing between the levels. The structure's tip height reaches 74 metres.
The nacelles are mounted separately on left and right side tubular-steel arms. These arms in turn are flexibly attached to a rotating central chassis.
The concept is being tested in three perspectives — aerodynamics, structure and load.
"Right now we are testing various software functions. One of them is the cut-out functionality — if the concept demonstrator stops when it reaches the cut-out wind speed," said Vestas senior specialist Erik Carl Lehnskov Miranda.
"Another one is the yaw system supervision that shuts down the turbine in case the yaw misalignment exceeds certain values," added Miranda.