摘要
当前新能源发电系统普遍存在的波动性和低惯量特征导致电力系统频率稳定性下降,目前常用的直流电容惯性同步控制由于缺少阻尼环节在系统扰动的情况下易发生系统振荡。对此,本文提出一种适用于柔直受端构网型换流器的前馈阻尼策略,通过引入受端直流侧电压偏差以及阻尼系数组成前馈阻尼,补偿控制中缺少的阻尼环节;通过对比分析有无阻尼的构网型换流器小信号模型的惯量、同步系数及阻尼环节,证明了该策略能够为系统提供阻尼,前馈阻尼数学模型在物理意义上与同步机一致,弥补了已有研究方法在物理意义可解释性上的不足,便于参数匹配,适用于全频段,提高了模型的适应性。搭建了柔直并网系统仿真模型和实验平台,结果表明所提前馈阻尼控制策略能够在不同扰动情况下有效抑制系统振荡。
The inherent fluctuations and low inertia characteristics of current renewable energy generation systems lead to degraded frequency stability in power systems.Conventional DC capacitance inertia⁃synchronization control methods,which lack damping components,tend to cause system oscillations under disturbances.To address this is⁃sue,this paper proposes a feedforward damping strategy suitable for grid⁃forming converters in flexible DC receiv⁃ing⁃end systems.By introducing DC⁃side voltage deviation and damping coefficients to construct feedforward damp⁃ing,this strategy can compensate for the missing damping components in control systems.Through comparative a⁃nalysis of small⁃signal models with/without damping components can regarding inertia,synchronization coefficients,and damping characteristics,we demonstrate that this strategy can effectively provide system with damping.The mathematical model of feedforward damping aligns with the physical principles of synchronous machines,overco⁃ming the interpretability limitations of existing research methods while facilitating parameter matching and ensuring full⁃frequency applicability,thereby enhancing model universality.Simulation models and experimental platforms for flexible DC grid⁃connected systems were established,with results confirming that the proposed feedforward damping control strategy effectively suppresses system oscillations under various disturbance conditions.
作者
颜湘武
徐越
巩宇
邵尹池
贾焦心
邵晨
YAN Xiangwu;XU Yue;GONG Yu;SHAO Yinchi;JIA Jiaoxin;SHAO Chen(Hebei Key Laboratory of Distributed Energy Storage and Microgrid(North China Electric Power University),Baoding 071003,China;Electric Power Research Institute,State Grid Jibei Electric Power Company Limited,Beijing 100032,China;College of Mechatronical&Electrical Engineering,Hebei Agricultural University,Baoding 071003,China)
出处
《电工电能新技术》
北大核心
2025年第11期47-57,共11页
Advanced Technology of Electrical Engineering and Energy
基金
国家自然科学基金项目(52207102)。
关键词
柔性直流输电系统
换流器
构网型控制
前馈阻尼
小信号模型
flexible DC transmission
power electronic converter
grid⁃forming control
feedforward damping
small⁃signal model
