并网接口滤波器拓扑结构推演与分析.PDF

2015 年 2 月 电 工 技 术 学 报 Vol.30 No. 4 第 30 卷第 4 期 TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Feb. 2015 并网接口滤波器拓扑结构推演与分析 许德志 汪 飞 阮 毅 毛华龙 张 巍 杨 影 （上海大学机电工程与自动化学院 上海 200072 ） 摘要 作为并网逆变器的重要组成部分，接口滤波器滤波特性的好坏直接决定着逆变器的并 网性能和成本体积。从滤波器拓扑结构入手，在深入分析现有L 型、LCL 型和LLCL 型滤波器特 性的基础上提出了一种并网接口滤波器统一电路模型。根据该模型对五阶以下滤波器可能的拓扑 结构进行推演、归纳与比较，提出了LLCCL1 型和LLCCL2 型两种新型滤波器拓扑结构。在逆变 器侧高频谐波衰减特性、电网侧高频谐波抑制特性、参数设计及谐振尖峰无源阻尼等方面对新型 滤波器和现有滤波器进行了详细地对比研究。理论分析和仿真结果均验证了所提出拓扑结构推演 方法和新型滤波器结构的正确性和合理性。 关键词：并网接口滤波器 滤波器拓扑 滤波特性 谐波抑制特性 参数设计 无源阻尼 中图分类号：TM46 Topology Deduction and Analysis of Grid-Interfacing Filters Xu Dezhi Wang Fei Ruan Yi Mao Hualong Zhang Wei Yang Ying （Shanghai University Shanghai 200072 China ） Abstract Grid-interfacing filter that is usually adopted to mitigate switching frequency harmonics introduced by pulse width modulation procedure has a significant influence on inverter system performance, volume and cost. Based on in-depth analysis of harmonic attenuation characteristics of L, LCL and LLCL filters, a unified circuit model of grid-interfacing filter is proposed in this paper. Through topology deduction and performance comparisons of the five-order and the following filters, two new filters, LLCCL1 and LLCCL2 filters, are developed. Mitigations of the high frequency harmonics from the inverter side, suppressions of the high frequency harmonics from the grid side, design methods of filter parameters and passive damping of the resonance peaks are comprehensively investigated and compared among different types of filter structures. Theoretical analysis and simulation results are presented to demonstrate