逆变器并联谐振及多重抑制方法研究

摘要

Resonance phenomenon will occur very easily when multiple inverters are paralleled with the weak power grid,which is characterized by large network impedance and smaller short-circuit capacity.In this paper,the resonance phenomenon caused by the parallel connection of multiple inverters is analyzed,and the causes of the resonance are analyzed from the aspects of system resonance and resonance.In the Matlab/Simulink,a precise simulation model of 4 inverters is built,and the proposed method is verified by simulation results.The simulation results show that the proposed method is effective.%多台逆变器并联接人阻抗较大的弱电网时,逆变器容易发生谐振现象.文章从系统谐振电路、谐振源等方面分析了谐振产生的机理,提出一种多重谐振抑制方法,可以有效降低逆变器输出侧多个谐振频率点处较高的谐波含量.在Matlab/Simulink中搭建了多台考虑死区、数字控制延时精确仿真的逆变器模型.仿真结果验证了文章谐振抑制策略方法的有效性.