The concept of power quality includes the quality of the supplying voltage with respect to, for instance, voltage sag, imbalance, harmonic distortion, voltage fluctuation and flicker, etc.
So this paper mostly studies the algorithm of detecting voltage sag, voltage fluctuation and flicker in power quality problems.
因此，本论文确定将电能质量问题中的电压跌落和电压波动及闪变现象作为主要研究对象。
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This method can provide the reference for electric utilities and users for evaluation of power quality, offering the economic parameters to evaluate voltage sag under electric markets environment.