Abstract
Given that dynamically variability and uncertainty (randomness, fuzziness, grayness and unsacertainty) exist in comprehensive evaluation of power quality, this paper described and treated the uncertainty information reasonably in index parameter, boundary and weight. Based on the variable fuzzy sets evaluation method, blind number theory was introduced into power quality evaluation to deal with the uncertainty problems, and a comprehensive evaluation model based on blind number and variable fuzzy sets theory was proposed. Superiority and effectiveness of the suggested method can be verified by case study, therefore, the model can be used to evaluate power quality in the power quality management.
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