DOI:10.35833/MPCE.2019.000470 Evaluation Method and Probabilistic Index of Voltage Sag Severity Considering Point-on-wave Page view: 0        Net amount: 410 Author: Guopei Wu1,Qing Zhong2,Qizhang He2,Zhong Xu1 Author Affiliation: 1.Guangzhou Power Supply Bureau Cooperation, Guangzhou, China;2.School of Electric Power, South China University of Technology, Guangzhou, China Foundation: This work was supported by China Southern Power Grid (No. GZHKJXM20170141). Abstract: The impact of voltage sag on sensitive devices is related to the time when the sag occurs. However, the point-on-wave of a sag is uncertain. Therefore, this paper presents a novel approach to evaluate the voltage sag severity considering a random point-on-wave. First, the uncertainty of equipment malfunction is revealed. Second, under a given residual voltage, the relationship between the point-on-wave and the duration that the device can withstand is described with a fitting curve. Third, a voltage sag probabilistic index is proposed to describe the severity. The evaluation procedure is also presented. Finally, three types of releasers are tested and analyzed to determine the effectiveness of the proposed method. The evaluation method can help instruct electrical engineers establish more well-grounded sag mitigation proposals. Keywords: Voltage sag ; evaluation method ; severity index ; probabilistic index Received:July 13, 2019               Online Time:2021/05/19 View Full Text       Download reader