电测与仪表2024，Vol.61Issue(7)：50-56,7.DOI:10.19753/j.issn1001-1390.2024.07.008
海上柔性直流输电系统的宽频带振荡非同时性研究
Asynchronous characteristics research of wideband oscillation in offshore wind farms connected to MMC-HVDC
摘要
Abstract
The high proportion of renewables and high proportion of power electronics have become the significant devices in power systems.The instability of power systems caused by wideband oscillation has become one of the important problems which need to be solved.Nowadays,the fast fourier transform(FFT)is generally used to analyze the frequency spectrum characteristics of the oscillation waveforms.The shortage of FFT is analyzed in this paper.Then,the FFT and short-time fourier transform(STFT)are used to extract the time-frequency spectrum of oscillation waveforms.Firstly,the simulation model of offshore wind farms connected to modular multilevel converter based high voltage DC(MMC-HVDC)transmission is built in PSCAD/EMTDC.When the control parameters are changed sud-denly or the short-circuit fault appears in the system,the time-frequency spectrum characteristics of the wideband os-cillation are studied.It is found that different oscillation frequencies occur at different times through STFT.The asyn-chrony of the wideband oscillation of offshore wind farm connected to MMC-HVDC is presented,which provides a way to study the propagation of wideband oscillation and the suppression of oscillation in HVDC system.关键词
宽频带振荡/振荡传播/海上柔性直流输电/傅里叶变换/短时傅里叶变换Key words
wideband oscillation/oscillation propagation/offshore wind farm connected to MMC-HVDC/fast fou-rier transform/short-time fourier transform分类
动力与电气工程引用本文复制引用
高磊,张慧媛,许军,姚蜀军,吴倩..海上柔性直流输电系统的宽频带振荡非同时性研究[J].电测与仪表,2024,61(7):50-56,7.基金项目
国家电网有限公司总部科技项目(4000-202018044A-0-0-00) （4000-202018044A-0-0-00）
