单相单级光伏LCL并网逆变系统控制策略Control Strategy of Single-Phase Single-Stage LCL Grid-Connected Photovoltaic Inverter System
江渝;姜琦;黄敏;梁波;
摘要(Abstract):
在传统的光伏LCL并网逆变系统中,直流侧电压只有大于其最小需求电压时,逆变器才能有效控制并网电流,而最小需求电压随电网电压的增加而增加。为此需在单级逆变系统中串联多块光伏电池以提高其直流侧电压,但这提高了光伏并网发电系统的应用门槛。对此提出一种新型的LCL并网逆变系统及其控制方法,该逆变系统对并网电流有较强的控制能力,对逆变器直流侧电压没有要求,且电网电压对其控制能力也没有影响。与传统LCL电路相比,新型LCL电路同样具有较好的滤波效果。在控制系统中利用基波分量提取环节增加系统阻尼,提高系统稳定性;根据光伏电池的直流电压、电流和2次脉动电压、电流判断光伏的最大功率点;通过控制并网电流使光伏电池工作在最大功率状态。仿真结果验证了所提系统结构及其控制方法的正确性。
关键词(KeyWords): 单相单级;并网;光伏逆变器;最大功率点跟踪
基金项目(Foundation):
作者(Author): 江渝;姜琦;黄敏;梁波;
Email:
DOI: 10.13335/j.1000-3673.pst.2015.02.003
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