Abstract
This paper is based on interval data of power customer satisfaction degree. The evaluation method of voltage sag or dip is an analytical one which is used to consider the satisfaction of not only the utility but also the user side. Determining function is from the length of fault line and the voltage magnitude in the modern transmission and distribution network. The critical failure positions method is getting through analytical algorithm combined with iterative features. The range characteristics of satisfaction degree of customer side and the distribution regularities of the uncertainty region are considered in the paper. Then, the quantitative frequency of voltage sag is determined using the interval sag frequency. A small size network and IEEE 30-bus RTS are chosen to comparing with existing and traditional methods. And this novel method is proved to have much more academic value and practical foreground.
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