弱电网下LCL滤波并网逆变器自适应电流控制许津铭谢少军唐婷.pdf

网络出版时间：2014-04-29 16:08 网络出版地址：/kcms/detail/11.2107.TM1857.018.html 第34 卷 第0 期 中 国 电 机 工 程 学 报 Vol.34 No.0 000.00, 2014 2014 年0 月00 日 Proceedings of the CSEE ©2014 Chin.Soc.for Elec.Eng. 1 DOI ：10.13334/j.0258-8013.pcsee.2014.00.000 文章编号：0258-8013 (2014) 00-0000-00 中图分类号：TM 弱电网下LCL 滤波并网逆变器自适应电流控制 许津铭，谢少军，唐婷 (南京航空航天大学自动化学院，江苏省 南京市 210016) An Adaptive Current Control for Grid-connected LCL-filtered Inverters in Weak Grid Case XU Jinming, XIE Shaojun, TANG Ting (College of Automation Engineering, Nanjing University of Aeronautics Astronautics, Nanjing 210016, Jiangsu Province, China) ABSTRACT: Grid uncertainties including the grid distortions 也会失效。针对上述问题，提出一种基于电网阻抗估测的自 and the varied grid impedance challenge the current control of 适应控制方法，即时修正用于前馈补偿的电压以及调整调节 grid-connected LCL-filtered inverters. The simple proportional 器参数以保证较好的相位裕度或高带宽。对比分析以及实验 grid voltage feed-forward provides high rejections of low-order 研究表明提出的方案可有效地提高LCL 滤波并网逆变器的 distortions. However, the study concerning the grid impedance 电网适应性。 has not been presented. In this paper, the current control with 关键词： LCL 滤波器；电网失真；电网阻抗；前馈补偿； the grid feed-forward considering the varied grid impedance 自适应控制 was studied. The stability margins are decreased and even the instability is yielded if the grid feed-forward is adopted and the 0 引言 grid inductive impedance increases. Besides, low-order current LCL 滤波器可以很好地抑制开关频率谐波、降 harmonics rejections are aggravated. Thus, an adaptive control