Fred Ferguson, a Canadian engineer specialising in airships, has designed a wind turbine that will use the constant winds that exist at 1, 000 feet to produce renewable energy.
An example is the speed control system of a turbine-generator set in a power station, whose main purpose is to maintain the generator speed as nearly constant as possible.
电厂涡轮发电机组就是一个例子，它主要的目的是维持发电机的转速尽可能的接近于恒值。
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This paper introduces the control method for the Wind Turbine Units of constant speed constant frequency and variable speed constant frequency.