摘要
针对基于频域无源性设计的LCL型并网逆变器接入弱电网后可能会引发高频段谐波振荡问题,设计一种改进的并网逆变器前馈相位补偿策略。首先对LCL型并网逆变器的无源性及并网系统的相角裕度进行分析;然后提出一种改进的并网逆变器控制策略,通过附加超前相位补偿的PCC点电压前馈策略,保证系统无源性以及输出阻抗的相角裕度,避免发生高频段的谐波振荡,提高弱电网条件下并网逆变器系统的稳定性;最后通过仿真验证了所提方法的有效性。
Aimed at the problem that an LCL grid-connected inverter based on frequency-domain passivity design may cause high-frequency harmonic oscillations when it is connected to a weak grid,an improved feed-forward phase com⁃pensation strategy for the grid-connected inverter is designed.First,the passivity of the LCL grid-connected inverter and the phase margin of the grid-connected system are analyzed.Then,an improved control strategy for the grid-con⁃nected inverter is proposed,in which the PCC voltage feed-forward strategy with additional lead phase compensation en⁃sures the passivity of the system and the phase margin of output impedance,thus avoiding the occurrence of high-fre⁃quency harmonic oscillations and improving the stability of the grid-connected inverter system under weak grid condi⁃tions.Finally,the effectiveness of the proposed method is verified by simulations.
作者
李志军
刘洪佶
张家安
杨梦伟
LI Zhijun;LIU Hongji;ZHANG Jia’an;YANG Mengwei(State Key Laboratory of Reliability and Intelligence of Electrical Equipment(Hebei University of Technology),Tianjin 300130,China;College of Artificial Intelligence and Data Science,Hebei University of Technology,Tianjin 300130,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2023年第4期132-139,共8页
Proceedings of the CSU-EPSA
基金
河北省科技支撑计划资助项目(15212105D)。
关键词
频域无源性
并网逆变器
弱电网
谐波振荡
电压前馈
相角裕度
frequency-domain passivity
grid-connected inverter
weak grid
harmonic oscillation
voltage feed-for⁃ward
phase margin
