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2.0 System Description
NOTICE: Use of the material contained in this document is subject to the warning on page Iv and the disclaimer
on page v of this document.
DOC012R02 AOC 15/50 User Manual Nov 2001
8
The following sections provide a general description of the AOC 15/50 and its control system.
2.1 General Description and Features of the Turbine
The designation 15/50 refers to the 15 m diameter wood/epoxy or fibreglass rotor and its
projected rated output of 50 kW. This rated output is achieved at 12 m/s (26.8 mph) by the 50 Hz
version and at 11.3 m/s (25.3 mph) by the 60 Hz one.
The AOC 15/50 includes the following design features:
• Advanced NREL thick series airfoils
• High strength to weight ratio wood/epoxy or fiberglass blades
• Electro-magnetically/actively controlled tip brakes
• Single piece hub casting
• Rotary transformer to power the tip brake magnets
• Integrated planetary gearbox
• Induction generator
• Single piece cast tower top with turn table yaw bearing
• Uniformly tapered lattice tower
• Dynamic brake
• PLC based controller with adaptive features
• Optional tilt-up lattice tower
Both turbine versions are designed to cut in at 4.6 m/s (10.2 mph). The 50 Hz version reaches its
peak continuous output of 55 kW at 15 m/s (34 mph); the 60 Hz one achieves its peak of 65 kW
(60 Hz) at 16 m/s (36 mph). Assuming 100% availability and average wind speeds of 8 m/s (18
mph), the 50 Hz wind turbine is calculated to produce approximately 190,000 kWh per year and
the 60 Hz one, 215,000 kWh. In average wind speeds of 6.7 m/s (15 mph), the 50 Hz version
produces approximately 145,000 kWh annually and the 60 Hz one, 153,000 kWh.
NOTE: Energy production is site specific and varies with altitude, temperature,
topography, climate and the wind turbine’s proximity to other structures, as well as its
maintenance condition.
The standard tower is a 24.4 m (80 ft) tall, self-supporting lattice structure. The gearbox is
integrated in the single piece cast housing. See Figure 2-2 for a more detailed view of the drive
train assembly. The generator is flange mounted to the planetary gearbox, with the parking
brake coupled directly to the generator.