Generators: Infinitely Variable Generators (IVG) What is DDMotion IVG: Customized IVMC with a feed-back control Major Applications: Generators for harnessing wind and water energy Wind Generators in General: Wind speed is variable. The optimum strategy for harnessing more energy for less money is the following one: Below the rated speed, capture the maximum energy by letting the rotors rotate variably but maintaining the power coefficient at maximum, and, above the rated speed, generate the rated power and protect the rotors by controlling the rotor rpm constant until the cut-out speed. There are two types of techniques for harnessing the maximum energy below the rated speed: (1) generating variable power then converting it to grid compatible constant power by using a Variable Frequency Converter (VFC) and (2) converting the variable rotor rpm to constant by using a transmission then rotating a constant speed induction generator to generate the constant power. DDMotion technique belongs to the latter. How IVG works: IVG converts variable rotor rpm to constant so that the maximum energy can be captured and constant speed induction generators can be used to generate grid compatible constant power. Generators with DDMotion IVG-Wind: DDMotion IVG converts variable rotor rpm to constant so that constant speed induction generators can generate grid compatible constant power. Major Benefits with DDMotion IVG-Wind: Elimination of variable frequency converter to reduce cost, power losses, and failures Use of constant speed induction generators to reduce cost and improve reliability Reduction of operating loads in the drive train Generators with DDMotion IVG-Water: DDMotion IVG-Water converts variable rotor rpm to constant so that constant speed induction generators can generate grid compatible constant power. Major Benefits with DDMotion IVG-Water: Dams are not necessary to be built: cost, time, no blockage to river traffic or migrating fish Water flows without stops: water generators can supply power for the peak time demand Water is 800 times denser than air: more energy Power demand is near the water Power grid is already existing
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