中国电机工程学报2025，Vol.45Issue(24)：9518-9529,中插4,13.DOI:10.13334/j.0258-8013.pcsee.241196
跟网型变流器并网系统锁相同步与功率平衡间的相互作用分析
Interaction Analysis Between PLL-based Synchronization and Power Balance of Grid-following Converters Tied to AC System
摘要
Abstract
Due to strong coupling of grid-following converter,the relation between phase-locked loop(PLL)-based synchronization loop and DC-link voltage control(DVC)-based power balance is unclear.In this paper,the interaction analysis between these two controls is developed in the cases of bandwidth separation and bandwidth proximity.Firstly,based on control dynamic behaviors,the damping ratio and oscillation frequency are defined as PLL dynamic indexes,and the synchronous torque and damping torque are defined as DVC dynamic indicators.Then,by the singular perturbation analysis,the linear model established before is algebraically reduced in critical scene,and the interaction in the case of bandwidths separation is revealed by analyzing the changes in these dynamic indicators.Furthermore,based on the open-loop transfer function of DVC,the effects of PLL on the amplitude margin of DVC are analyzed to reveal the interaction in the case of bandwidths proximity.In particular,the impacts of terminal voltage control(TVC)are considered.It is found that the interaction between PLL and DVC is deteriorated with TVC bandwidth decreasing,leading to a reduction of the static stability limit and the instability disappearance in the case of bandwidths proximity.关键词
相互作用分析/同步环/功率平衡/带宽/线性化模型Key words
interaction analysis/synchronization loop/power balance/bandwidth/linear model分类
信息技术与安全科学引用本文复制引用
洪镇堃,程旻,占萌,余佳微,朱益华,武明康..跟网型变流器并网系统锁相同步与功率平衡间的相互作用分析[J].中国电机工程学报,2025,45(24):9518-9529,中插4,13.基金项目
中国南方电网有限责任公司创新项目(YNKJXM20222153).Project Supported by Innovation Project of China Southern Power Grid of China(YNKJXM20222153). （YNKJXM20222153）
