太阳能并网输出LCL滤波器的设计

摘要

The pulse width modulated(PWM)inverter used in grid-connected photovoltaic inverter can generate harmonics to interfere the power networks.Basod on the inverter module and three-phase inverter system,the mechanism of harmonics generation is analyzed.With the performance analysis of passive LCL filter and parameters optimization, the inductance is decreased and the dynamic performance is improved,the harmonics can be restrained efficiently.The validity of proposed filter is supported by the simulation results in Matlab.%太阳能并网逆变器使用的IGBT 工作在高速开关状态,形成了很大的du/dt和di/dt.由于杂散电容、电感的存在,使得电路中形成大量的谐波,并网时严重干扰了电网.基十逆变器的电路模型,针对三相光伏逆变系统,分析了谐波产生机理.通过对无源LCL滤波器性能的分析及其参数优化,降低了电感量,改善了系统的动态性能,有效地衰减了该系统产生的高次谐波.通过Matlab仿真,验证了该设计的有效性.