A Protection Method of VSC-HVDC Cables Based on Generalized S-Transform
作者单位：School of Electrical Engineering Xi’an University of Technology
会议日期：2021年
学科分类：080802[工学-电力系统及其自动化] 0808[工学-电气工程] 08[工学]
关 键 词：Generalized S-Transform VSC-HVDC Phase-Mode Transformation DC Cable Protection
摘 要：Generalized S-transform is a time-frequency analysis method which has higher resolution than S-transform. It can precisely extract the time-amplitude characteristics of different frequency components in the signal. In this paper,a novel protection method for VSC-HVDC（Voltage source converter based high voltage DC） based on Generalized S-transform is proposed. Firstly, extracting frequency component of fault current by Generalized S-transform and using mutation point of high frequency to determine the fault time. Secondly, using the zero-frequency component of fault current to eliminate disturbances. Finally, the polarity of sudden change currents in the two terminals is employed to discriminate the internal and external faults. Simulations in PSCAD/EMTDC and MATLAB show that the proposed method can distinguish faults accurately and effectively.