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Evaluation of the Operating Status of Voltage Sensitive Equipment Considering the Protective Action Mechanism of Low Voltage Release under the Random Influence of Voltage Sag |
Wang Xue1, Tang Zhengcong1,2, Liu Xingjie3 |
1. Department of Electric Engineering North China Electric Power University Baoding 071000 China; 2. State Grid Yancheng Power Supply Company Yancheng 224000 China; 3. School of Physics and Electronic-Electrical Engineering Ningxia University Yinchuan 750000 China |
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Abstract Considering the influence of the randomness of the voltage sag at the system side and the action characteristics of the low voltage release at the load side on the equipment, a method for evaluating the operating status of voltage-sensitive equipment is proposed. Based on the tolerance of low voltage release and sensitive equipment, two operating states of sensitive equipment are defined which are effective operating state and safe shut-off state. Aiming at the uncertainty of equipment tolerance in fuzzy regions, a reliability analysis method based on evidence theory is introduced. Discretization methods are used to characterize the evidence structure of discrete and continuous random variables, and the discrete sub-intervals of the variables are used as evidence bodies to construct their basic probability distribution. The proposed method was applied to the state assessment of sensitive equipment, and compared with the Latin hypercube sampling simulation, the effectiveness of the method was verified. The influences of different characteristic voltage sag distribution and low voltage release action characteristics on the operating state of sensitive equipment were further explored. The research conclusion can provide guidance for low voltage release configuration and sag management.
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Received: 19 May 2021
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