A PC Based Power Line Monitoring System For Non-Linear Loads

Switch mode power electronic converters draw non-sinusoidal currents from the utility ac supply and can cause distortions in the voltage available from single phase and three phase mains. Since such converters are widely used in industry, power quality is of increasing concern. This paper presents a PC based system for monitoring power lines feeding non-linear loads. The proposed scheme can determine and display typical parameters of interest in real-time, including total harmonic distortion, power factor and the voltage and current waveforms. The implemented system is tested on an ac to dc converter supplying an inductive load at various firing angles to validate its performance.

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