Power quality disturbances mainly include harmonics, voltage sags, voltage swells, voltage interrupts, flickers, oscillation transients, voltage sags with harmonic and voltage swells with harmonic.
Interval evaluation of voltage sag magnitude and frequency in distribution system
Analysis of voltage sags in distribution system.
Such problems as the attenuation of DC elements and Sine waveform, voltage sag and frequency deviation should be taken into account in order to analyze the transient process in the power system.
This paper puts forward the assessment on the real-time operation state of the specific equipment while voltage sag happens based on the energy impact on users.
On the basis of the study, a prototype of 150kva capacity has been built, and the control occurred of voltage sag and harmonic have been achieved using this prototype as a platform.
A momentary voltage dip that lasts for a few seconds or less is classified as a voltage sag.
An improved method to detect voltage sag characteristics
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