基于双闭环控制的光伏发电用Cuk逆变器研究

Research on a photovoltaic Cuk inverter based on double-loop control

提出了一种用于可再生能源发电的新型Cuk并网逆变器,该并网逆变器应用Cuk电路进行输入串联、输出并联,以构成一种新型非隔离单级输出并联输入串联双Cuk逆变电路。该电路采用电压电流双闭环控制策略,以实现输出波型的正弦化,以及使新拓扑获得很好的自适应性和较强的鲁棒性。仿真和实验结果表明,采用双闭环控制后的新型Cuk并网逆变器表现出很好的动态和稳态性能,且输出电流谐波含量低,波形质量好。

A new kind of Cuk grid-connecting inverter was proposed for renewable energy power generation. The grid： connecting inverter uses the Cuk circuits to achieve input series and output parallel to form a new type of non isola- ted single stage output parallel and input series double Cuk inverter circuit. The inverter circuit adopts the double- loop control strategy to realize the sine pattern of its output waveform and enhance its to pologies＇ adaptability and robustness. The simulation results showed that the proposed inverter with double-loop control had the better dynamic and static performance in grid connecting, with less output current harmonics and the better waveform.