Equivalent Evaluation Method of Three-Phase Voltage Flicker Evaluation

Owing to violent and stochastic load fluctuation, different voltage flicker components may exist in different phases. Traditionally, the averages of three single-phase values are given. However, in this paper, it wants to investigate a fast computation algorithm to calculate directly the equivalent three-phase values. After the voltage waveforms of three phases are recorded, the voltage flicker components are obtained from the voltage envelopes constructed by the RMS values and instantaneous voltage vectors, respectively. Some given simulation waveforms and field-measured waveforms are adopted to reveal the advantages of those methods. The calculation results demonstrate the proper approach to obtain the equivalent three-phase voltage flicker components. Key-Words: Voltage flicker, Power quality, Instantaneous voltage vector, Voltage waveform, Fast Fourier transforms.