光伏并网逆变器LCL陷波校正滤波器

LCL Filter with Notch Correct of Grid-Connected Photovoltaic Inverters

为了抑制LCL滤波器的谐振,提高光伏并网逆变器的输出性能,介绍了一种基于陷波校正法的光伏并网逆变器输出滤波控制方案,将陷波校正法和超前/滞后环节引入LCL滤波器,给出了LCL滤波器的设计参数。系统仿真和实验结果表明,这种滤波方案有效抵消了LCL滤波器的正谐振峰,有效地滤除了逆变器输出电流的高次谐波,改善了电流波形的质量,提高了光伏并网逆变器的输出效率。

In this paper, for repressing the resonance of LCL （inductance capacitance inductance） filter, raising output performance of grid-connected photovoltaic inverter, an output filtering means based on notch correction is introduced. The notch correction and leading/delay unit is embedded into the LCL filter, and the design parameter of LCL filter is given. The Simulation and experiment result show this filtering means can availably fall down positive resonance peak of LCL filter, smooth higher harmonic of inverter output current, improve the quality of current waveform, and raise the output efficiency of photovoltaic inverters.