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

作　　者：高磊[1] 张慧媛[1] 许军[1] 姚蜀军[1] 吴倩 GAO Lei;ZHANG Huiyuan;XU Jun;YAO Shujun;WU Qian(School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China;Economic Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210008,China)

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]国网江苏省电力有限公司经济技术研究院,南京210008

出　　处：《电测与仪表》2024年第7期50-56,共7页Electrical Measurement & Instrumentation

基　　金：国家电网有限公司总部科技项目(4000-202018044A-0-0-00)。

摘　　要：随着“双高”电力电子设备的大量使用,宽频带振荡对于电力系统稳定性的影响亟待解决。目前分析振荡波形的“频谱”特性主要是采用快速傅里叶变换提取波形的频谱图进行分析。文章分析了快速傅里叶变换的不足之处,提出了利用快速傅里叶变换和短时傅里叶变换提取振荡波形“时频谱”图的方法,对振荡后的波形进行研究分析。根据海上柔性直流输电系统的结构在PSCAD/EMTDC搭建其仿真模型,研究系统控制参数突变失稳以及系统故障时出现的宽频带振荡波形的时频谱特性,利用短时傅里叶变换发现不同的振荡频率出现的时刻不同,发现了海上柔性直流输电系统宽频带振荡非同时性的存在,为研究宽频带振荡的传播以及振荡的抑制提供了一种思路。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 suddenly or the short-circuit fault appears in the system,the time-frequency spectrum characteristics of the wideband oscillation are studied.It is found that different oscillation frequencies occur at different times through STFT.The asynchrony 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 

分 类 号：TM721[电气工程—电力系统及自动化]