基于频域无源性的并网逆变器前馈相位补偿策略  

Frequency-domain Passivity Based Feed-forward Phase Compensation Strategy for Gridconnected Inverter

作　　者：李志军[1] 刘洪佶 张家安[1] 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)

机构地区：[1]省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学),天津300130 [2]河北工业大学人工智能与数据科学学院,天津300130

出　　处：《电力系统及其自动化学报》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)。

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.

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 

分 类 号：TM464[电气工程—电器]