Chen Dongdong, Zhang Shengqi, Lin Hongyi
School of Electronics and Electrical Engineering, Minnan University of Science and Technology, Quanzhou, 362700, Fujian, China.
College of Electrical Engineering and Automation, Fuzhou University, Fuzhou, 350108, Fujian, China.
Sci Rep. 2024 Oct 2;14(1):22911. doi: 10.1038/s41598-024-73897-5.
LCL filters are extensively utilized in Grid-connected inverters due to their exceptional capability in suppressing high-frequency harmonics. The active damping method is commonly employed to mitigate the resonance peak of the LCL filter. However, this control strategy induces a shift in the natural resonance point. To address this issue, a novel active damping control strategy based on the principle of equivalent transformation is proposed in this paper, which not only effectively suppresses the resonance peak but also avoids deviation from the natural resonance point. Finally, experiments are carried out on a three-phase LCL Grid-connected inverter, and the experimental results show that the control strategy has good steady-state performance, dynamic response, and robustness under both rigid and ultra-weak network conditions.
LCL滤波器因其在抑制高频谐波方面的卓越能力而被广泛应用于并网逆变器中。通常采用有源阻尼方法来降低LCL滤波器的谐振峰值。然而，这种控制策略会导致自然谐振点发生偏移。为了解决这个问题，本文提出了一种基于等效变换原理的新型有源阻尼控制策略，该策略不仅能有效抑制谐振峰值，还能避免偏离自然谐振点。最后，在三相LCL并网逆变器上进行了实验，实验结果表明该控制策略在刚性和超弱电网条件下均具有良好的稳态性能、动态响应和鲁棒性。
