由于分布式并网逆变器的高渗透率，微电网系统中容易引发单逆变器本体谐振、多逆变器交互的局部谐振以及微电网层面的全局谐振。针对微电网中多并网逆变器-电网-负荷之间潜在的谐波交互与谐振问题，探索引入非线性因素的逆变器外特性建模方法，建立适于微电网谐振研究的并网逆变器模型；基于提出的微电网谐振模型，发现微电网在不同静、动态谐振激励条件和复杂工况下多谐振现象的产生机理；探究基于不同控制类型逆变器算法改进的微电网谐振抑制方法与共性技术，阐明各控制型并网逆变器在微电网应用中对谐振影响及谐振抑制的特点。从而获得面向微电网应用的新一代并网逆变器核心关键技术，为实现分布式多并网发电单元在电网的可靠、稳定工作提供技术支持，为降低电网谐波成份，改善电网稳定性和促进新能源的并网应用等提供研究基础。

For the high penetration of distributed grid-connected inverters, microgrids are easy to have internal resonances from individual inverters, partial resonances due to the interaction of multiple inverters, and global system resonances of microgrids. Aiming at the harmonic interaction and resonance problems among multiple inverters, loads and the grid in microgrids, in this project a systematic modeling method for grid-connected inverters, which is suitable for the resonance research of microgrids, will be derived based on the proposed models of inverter output-characteristics by introducing nonlinear factors. With the established resonant-network model of microgrids, the root causes of multiple resonances in microgrid will be explored with respect to various static and dynamic stimulation factors and complex working conditions. Mitigation methods and common technology for the resonances in microgrids will be proposed based on improved control of various types of inverters. The influence on resonance problems and the application features on oscillation damping from various types of grid-connected inverters in microgrids will be addressed. Consequently, it will be expected to achieve core technology for the next-generation of grid-connected inverters for microgrid appplications and it will also be able to technically support to realization of reliable and stable operation of multiple distributed power generations in the grid, and to provide research basis for the reduction of grid harmonics, stability improvement of grids and applications of renewable energy.