电力系统自动化2024，Vol.48Issue(16)：30-39,10.DOI:10.7500/AEPS20230826001
基于直流电压同步的构网型变流器低频振荡分析与阻尼控制
Low-frequency Oscillation Analysis and Damping Control for Grid-forming Converters Based on DC Voltage Synchronization
摘要
Abstract
The grid-forming converters based on DC voltage synchronization cannot only stabilize DC voltage but also realize the self-synchronization of converters.However,the interaction between DC voltage dynamics and control loops may cause low-frequency oscillation of the system.To study the mechanism of low-frequency oscillation,the"active power-power angle"model for stability analysis is built with consideration of the DC voltage synchronization control loop and AC voltage loop.It is found that DC voltage synchronization introduces more phase lag compared with active power synchronization,while the AC voltage loop also introduces phase lag in the loop.As a result,the system loop gain has the-180° phase crossing in the low frequency range with a high magnitude,thereby triggering the low-frequency oscillation issues.Based on the analysis of the low-frequency oscillation mechanism,two phase compensation methods for DC voltage synchronization control are proposed.Through reshaping the system loop phase in the high-gain-amplitude area of the low-frequency range,the damping control and oscillation suppression in the low-frequency range can be realized.Finally,the simulation and the experiment verify the correctness of the theoretical analysis and the effectiveness of the proposed methods.关键词
新能源/并网/构网型变流器/直流电压同步/低频振荡/小信号稳定性/相位补偿Key words
renewable energy/grid integration/grid-forming converter/DC voltage synchronization/low-frequency oscillation/small-signal stability/phase compensation引用本文复制引用
姜鑫,易皓,卓放,李雨果,王振雄..基于直流电压同步的构网型变流器低频振荡分析与阻尼控制[J].电力系统自动化,2024,48(16):30-39,10.基金项目
国家自然科学基金资助项目(51977172). This work is supported by National Natural Science Foundation of China(No.51977172). （51977172）
