Clipper's patented variable speed system is simpler, more reliable, and meets IEEE 519 high-quality power requirements now mandatory in all major electricity power markets.

Common in the industry today, most variable speed systems are based on a doubly fed generator with the rotor wired directly to dual IGBT's which, at lower wind speeds, flow current into the generator rotor and, at higher speeds, draw current out to maintain the turbine's desired power output frequency. As the current is transferred, it is conducted through slip rings and brushes which require frequent maintenance due to damaging stray currents induced in the generator rotor shaft. Also, these stray currents often find a way to an electrical ground, arcing across generator bearings, causing pitting which can lead to costly failures of the generator, turbine downtime, and expensive land crane mobilization.

Through Clipper's variable speed system, greater efficiency and reliability is made possible by recent advances in IGBT's and the use of proprietary permanent magnet generator technology. Here, power is delivered exclusively from the generator's stator where it is rectified to DC current. Advanced and more reliable IGBT's convert the DC power to AC current, simply and efficiently maintaining the unit's desired power factor. By way of this simplified process, the need for troublesome slip rings and brushes is eliminated.


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