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Noise canceling methods in power inverters

Aursulesei, Andrei (2019) Noise canceling methods in power inverters.

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Abstract:The power converters controlled by Pulse Width Modulation (PWM) signals exhibit harmonic noise, due to the sharp discontinuities in the PWM waveform. The objective is to develop an active filter which injects destructive interference back into the converter. In this paper, two mitigation methods named funda-mental and harmonics were developed using the Fourier series analysis applied to the harmonic components of the output spectrum. The interference provided by the first method suppresses the entire output spectrum but without the fundamental component, while the interference designed with the second method suppresses only specific selected harmonic components. Both methods were applied to an ideal power inverter designed in Simulink. The methods' performances are evaluated using the Signal to Noise Ratio (SNR) values recorded on the filtered out-put signals and the computation times required to construct the interference signals. Based on the recorded results, the harmonics method is the most suitable to be used in the development of a more complex filter that can work in a real setup.
Item Type:Essay (Bachelor)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:50 technical science in general, 53 electrotechnology
Programme:Electrical Engineering BSc (56953)
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