摘要
基于模块化多电平换流器(modularmultilevelconverter,MMC)的柔性直流输电系统接入电网后可能发生高频谐振现象,进一步导致柔性直流换流站执行闭锁逻辑保护对交流主网将产生严重的冲击。因此,研究柔性直流高频谐振及其抑制方案对提高工程安全性和可靠性具有重大促进作用。首先利用HISCAN软件对广东电网2025年规划交流电网进行了谐波阻抗扫描,采用广义奈奎斯特判据对广东电网系统存在的高频振荡风险点进行了全面的排查,然后通过所建立的电磁暂态模型进行时域仿真对柔性直流互联系统高频振荡进行时域评估和验证,最后针对系统可能存在的高频谐振点提出了解决振荡风险的相关抑制策略。
After the VSC-HVDC transmission system based on modular multilevel converter(MMC)is connected to the power grid,high-frequency resonance may occur,which further leads to the implementation of blocking logic protection for VSC-HVDC converter station,which will have a serious impact on the AC main grid.Therefore,the study of VSC-HVDC high-frequency resonance and its suppression scheme has a significant role in improving engineering safety and reliability.Firstly,the harmonic impedance of Guangdong Power Grid's planning AC power grid in 2025 is scaned by HISCAN software,and the generalized Nyquist criterion is used to conduct a comprehensive investigation of the high-frequency oscillation risk points in the Guangdong power grid system.Then,the established electromagnetic transient model is used for time-domain simulation to evaluate and validate the high-frequency oscillation of the VSC-HVDC transmission system.Finally,relevant suppression strategies are proposed to address the potential high-frequency resonance points in the system to address the oscillation risk.
作者
罗澍忻
刘瑞宽
金楚
左郑敏
林勇
张东辉
周强
王大洋
LUO Shuxin;LIU Ruikuan;JIN Chu;ZUO Zhengmin;LIN Yong;ZHANG Donghui;ZHOU Qiang;WANG Dayang(Grid Planning&Research Center,Guangdong Power Grid Co.,Ltd.,Guangzhou 510620,China;Sichuan Energy Internet Research Institute,Tsinghua University,Chengdu 610000,China)
出处
《南方电网技术》
CSCD
北大核心
2023年第11期1-9,21,共10页
Southern Power System Technology
基金
广东电网有限责任公司规划项目(031000QQ00200004)
国家重点研发计划资助项目(2019YFE0111500)。
