项目名称： 高渗透率分布式发电系统中LCL滤波并网逆变器关键技术研究

项目编号： No.51477077

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 电工技术

项目作者： 谢少军

作者单位： 南京航空航天大学

项目金额： 96万元

中文摘要： 高渗透率分布式发电系统中，公共耦合点(PCC)处存在的电网阻抗、电压波动和闪变、谐波、三相不平衡以及串并联谐振等现象严重影响并网逆变器性能。本课题研究并网逆变器高性能运行的核心技术，包括：建立LCL滤波并网逆变器电流控制的系统化分析模型以甄别、评价现有控制方法并发掘新型有源阻尼方法；与传统的LCL滤波器参数设计方法不同，研究滤波器参数同电流控制间的耦合、制约关系以期形成一套滤波器同控制器相结合的一体化优化设计方法；研究PCC处非理想状况对并网逆变器的作用机制，结合高性能的电网阻抗测量技术以形成一套具备复杂电网状况良好适应性的高性能并网逆变器设计手段与方法；建立分析模型以研究并解决多模块并联并网系统的谐波干扰问题，结合逆变模块解耦控制方法以及并联运行策略以实现可靠的并联并网。上述技术的突破可为LCL滤波并网逆变器在高渗透分布式发电系统中高性能及鲁棒运行奠定坚实的基础。

中文关键词： 并网逆变器；LCL滤波器；高渗透率；分布式发电系统；鲁棒性

英文摘要： In distributed power generation systems with high penetration, the performance of a grid-connected inverter is seriously affected by the non-ideal factors at the point of common coupling (PCC) including the grid impedance, the voltage fluctuation and flicker, the background harmonics and unbalanced three-phase grid, the series and parallel resonances and so on. This project studies the core technology of a grid-connected inverter to achieve high performance. By establishing a systematical analysis model of the current control for grid-connected LCL-filtered inverters, this project distinguishes and evaluates the existing control methods, and then explores some novel active damping control methods. Besides, the coupling and interdependent relations between filter parameters and current control are deeply studied. Then, unlike the typical design methods of LCL filters, this project proposes a novel design method integrated with filter and controller optimizations. In addition, the action mechanisms of PCC non-ideal factors to the inverter, as well as the high performance-featured grid impedance estimation, are investigated in this project. Consequently, this project synthesizes a design approach of grid-connected inverters with good capability of adapting to the PCC conditions in distributed power generation systems. Moreover, this project establishes an analytical model to study the harmonic interferences in the grid-connected system with multi-inverter modules in parallel. On the basis of effectively solving the harmonic interference problem, the grid-connected system can work with proper decoupling control and parallel operation methods. The breakthroughs in the above technologies can build a stable foundation for the high-performance and robust grid-connected LCL-filtered inverter in distributed power generation systems with high penetration.

英文关键词： grid-connected inverter;LCL filters;high penetration;distributed power generation system;robustness