中国电机工程学报2026，Vol.46Issue(10)：4011-4024,中插7,15.DOI:10.13334/j.0258-8013.pcsee.250336
非对称扰动下弱交流系统并网变流器不平衡控制策略研究
Unbalanced Control Strategy for Grid-connected Converters in Weak AC Systems Under Asymmetric Disturbances
摘要
Abstract
With the increasing penetration of distributed energy resources,the strength of AC power systems has progressively declined.In weak AC systems,the equivalent grid impedance rises,intensifying interactions between converters and the power grid.Traditional unbalanced control strategies exhibit reduced effectiveness in suppressing twice fundamental frequency power ripples and may even exacerbate transient power oscillations under disturbances.To address this issue,this paper first quantitatively analyzes the limitations of conventional unbalanced control strategies in mitigating power ripples within weak AC systems.Subsequently,a interactive power transfer model is established,incorporating dynamic characteristics of converter control loop,the phase locked loop(PLL),and the transmission line.Furthermore,a composite control-based unbalanced control strategy-dynamic power feed forward compensation(DPFC)is proposed for weak grid applications.By equivalently compensating the oscillatory power generated from closed-loop system interactions into the inverter's power outer loop,the proposed strategy effectively suppresses power ripples during both transient and steady-state operations.Finally,the effectiveness and superiority of the proposed strategy are verified by CHIL and PHIL experiments.关键词
弱交流系统/非对称扰动/二倍频功率纹波/复合控制Key words
weak AC grids/asymmetric disturbances/twice fundamental frequency ripples/composite control分类
信息技术与安全科学引用本文复制引用
刘承锡,刘明远,董旭柱,龚振,刘制,韩江北..非对称扰动下弱交流系统并网变流器不平衡控制策略研究[J].中国电机工程学报,2026,46(10):4011-4024,中插7,15.基金项目
智能电网国家科技重大专项项目(2025ZD0804800) （2025ZD0804800）
国家自然科学基金项目(U22B20100).Smart-Grid National Science and Technology Major Project(2025ZD0804800) （U22B20100）
Project Supported by National Natural Science Foundation of China(U22B20100). （U22B20100）
