高电压技术2025，Vol.51Issue(2)：570-580,中插5-中插6,13.DOI:10.13336/j.1003-6520.hve.20240651
基于动态虚拟阻抗的虚拟同步机阻尼增强控制
Damping Enhancement Control of Virtual Synchronous Generator Based on Dynamic Virtual Impedance
摘要
Abstract
The virtual synchronous generator(VSG)not only simulates the swing characteristics of synchronous generator(SG),but also introduces the problem of low-frequency oscillations.Typically,smaller damping coefficients will suffice to provide effective damping for SG,whereas VSG requires larger damping coefficients to maintain stability,resulting in undesirable droop characteristics.Therefore,this paper first compares the impedance models and damping torque models of SG and VSG,and reveals the mechanism which SG provides positive damping through transient/subtransient imped-ance while VSG voltage outer loop generates negative damping.Thereby,this paper simulates the positive damping mechanism of SG and proposes a damping enhancement control(DEC)based on dynamic virtual impedance.Parameter tuning is achieved using the ℌ-infinity control theory.Compared to traditional methods,DEC effectively suppresses VSG low-frequency oscillations without altering droop characteristics.Finally,the effectiveness of the proposed control is veri-fied by digital simulation based on Matlab/Simulink and hardware-in-the-loop simulation based on RT-LAB.The research results show that,compared with the traditional method,the proposed DEC can effectively suppress low-frequency oscil-lation without changing the droop characteristics of VSG,and has good robustness under strong/weak power grids.关键词
虚拟同步机/同步机/低频振荡/阻尼增强控制/动态虚拟阻抗/ℌ∞控制Key words
virtual synchronous generator/synchronous generator/low-frequency oscillations/damping enhancement control/dynamic virtual impedance/ℌ-infinity control引用本文复制引用
陈航宇,庄可好,王子骏,黄林彬,殷波,辛焕海..基于动态虚拟阻抗的虚拟同步机阻尼增强控制[J].高电压技术,2025,51(2):570-580,中插5-中插6,13.基金项目
中国大唐集团科技创新有限公司(新能源场站主动支撑场景下系统强度评估及提升技术研究)(DTKC-2024-20604).Project supported by China Datang Technology Innovation Co.,Ltd.(Research on System Strength Evaluation and Enhancement Technology under Active Support Scenarios of Renewable Energy Station)(DTKC-2024-20604). （新能源场站主动支撑场景下系统强度评估及提升技术研究）
