摘要
【目的】为增强高压直流输电系统的低电压限电流(voltage dependent current order limiter,VDCOL)控制对换相失败的抑制能力,需进一步系统性地梳理VDCOL改进方法研究现状以更清晰地分析其发展方向。【方法】在分析传统VDCOL局限性的基础上,从提升故障响应灵敏性、增强电流控制灵活性、实现多直流协同控制三方面,对抑制换相失败的VDCOL改进控制方法进行了详细梳理和分析。【结果】基于现有研究成果,VDCOL的优化改进主要体现在以下三个方面:(1)提升了故障响应灵敏性,首次换相失败抑制效果得到显著增强;(2)改进了电流指令生成机制和控制策略,有效提升了系统对后续换相失败的抑制能力;(3)设计了多种多直流系统VDCOL协同控制方法,提升了多直流系统换相失败抑制效果与协调恢复能力。【结论】考虑部分因素的启动策略存在片面性,电流控制在有功和无功间存在矛盾,多直流VDCOL协同控制存在主观性。计及多因素影响的启动策略、输入-输出特性曲线斜率优化设计、多直流VDCOL自适应协同控制是今后研究的重要方向,交直流混联电网的发展对VDCOL控制的精细化和协同化提出了更高的技术要求。
[Objective]The objective of this study is to systematically sort out the research status of the voltage dependent current order limiter(VDCOL)improvement method to enhance the ability of VDCOL control to commutation failure in highvoltage direct current(HVDC)transmission systems.[Methods]Based on an analysis of the limitations of the traditional VDCOL,the improved control methods of the VDCOL to suppress commutation failure were sorted and analyzed in detail from three aspects:improving the sensitivity of fault response,enhancing the flexibility of current control,and realizing multi-DC cooperative control.[Results]Based on the existing research results,the optimization and improvement of the VDCOL were mainly reflected in the following three aspects.(1)The fault response sensitivity improved,and the suppression effect of the first commutation failure significantly enhanced.(2)The current command generation mechanism and control strategy improved,effectively improving the system ability to suppress subsequent commutation failures.(3)Various VDCOL cooperative control methods for multi-DC systems were designed to improve the commutation failure suppression effect and coordination recovery ability of multi-DC systems.[Conclusions]The start-up strategy considering certain factors is onesided;a contradiction exists between active and reactive power in current control,and subjectivity exists in multi-DC VDCOL collaborative control.Considering the influence of multiple factors,the start-up strategy,optimal design of the slope of the input–output characteristic curve,and adaptive cooperative control of multi-DC VDCOL are important directions for future research,and the development of an AC/DC hybrid power grid proposes higher technical requirements for the refinement and synergy of VDCOL control.
作者
朱璇
汤奕
郑晨一
王莹
党杰
崔挺
ZHU Xuan;TANG Yi;ZHENG Chenyi;WANG Ying;DANG Jie;CUI Ting(School of Electrical Engineering,Southeast University,Nanjing 210096,China;Central China Branch of State Grid Corporation of China,Wuhan 430077,China;State Grid Hunan Electric Power Corporation Research Institute,Changsha 410007,China)
出处
《电力建设》
北大核心
2025年第8期78-91,共14页
Electric Power Construction
基金
国家电网有限公司科技项目(5100-202323008A-1-1-ZN)。
关键词
高压直流输电
低电压限电流(VDCOL)
改进控制策略
换相失败抑制
HVDC transmission system
voltage dependent current order limiter(VDCOL)
improved control strategies
commutation failure suppression
