电源学报2024，Vol.22Issue(4)：200-208,9.DOI:10.13234/j.issn.2095-2805.2024.4.200
柔性直流输电系统接入非理想电网的改进DSOGI同步方案
Improved DSOGI Synchronization Scheme for Flexible DC Transmission System Connected to Non-ideal Power Grid
摘要
Abstract
The traditional phase-locked loops(PLLs)in a VSC-HVDC system such as a synchronous reference frame PLL(SRF-PLL)and a dual second-order generalized integrator PLL(DSOGI-PLL)cannot accurately track the positive-sequence voltage phase of grid fundamental wave under non-ideal power grid,which will cause different degrees of phase-locked error,affect the control performance of VSC and reduce the system stability.To solve this problem,an improved DSOGI-PLL scheme is proposed.First,the attenuation characteristics of SOGI-QSG at different frequencies are analyzed according to the Bode diagram,and the limitations of DSOGI-PLL applications are obtained.Then,based on the voltage of harmonic grid,the internal model of repetitive control is introduced on the basis of DSOGI to realize the real-time tracking and regulation of harmonic signals,thus suppressing the harmonic voltage interference.At the same time,considering the DC bias and voltage frequency fluctuation of power grid,a method of DC bias elimination and frequency adaptation is proposed to realize the adaptive phase tracking of power grid.Finally,the superiority of the proposed strategy was verified through a comparison between the simulation and experimental results.关键词
柔性直流输电/锁相环/不平衡/谐波/直流偏置/频率自适应Key words
Flexible DC transmission/phase-locked loop(PLL)/imbalance/harmonic/DC bias/frequency adaptation分类
信息技术与安全科学引用本文复制引用
薛云涛,任百群,谢剑翔,陈宇昇,鄞庆佳..柔性直流输电系统接入非理想电网的改进DSOGI同步方案[J].电源学报,2024,22(4):200-208,9.基金项目
广东电网直流背靠背广州工程大湾区中通道直流背靠背工程资助项目(080099WS24200001)This work is supported by DC Back-to-back Guangzhou Project of Guangdong Power Grid DC Back-to-back Project of Middle Channel in Dawan District under the grant 080099WS24200001 （080099WS24200001）
