Chapter 1 of this thesis presents a discussion of common power system disturbances, including a section on the causes and effects of harmonic distortion Several standard methods for eliminating these disturbances are also discussed. In Chapter 2, a presentation of filter design techniques provides background information leading to the introduction of the proposed noise cancellation method. In the proposed circuit, the fundamental frequency component of the input waveform is attenuated by the use of a band stop filter.. The remaining distortion component is then inverted and coupled to the original input waveform by means of a series transformer. Chapter 3 presents a comparison of the proposed method to a typical band pass filter, using both simulated data and physical models, regarding such topics as frequency response, efficiency, and effectiveness in reducing distortion

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