中文摘要：

多并网逆变器系统的谐振给逆变器的稳定性和电网的电能质量带来了诸多问题。为解决谐振带来的各种问题．建立了多型并网逆变器系统阻抗模型，基于阻抗模型分析了系统谐振机理，研究了谐振特性和并网逆变器数量及电网强度的关系。并以两台并网逆变器系统为例，仿真和实验结果证明了模型的可用性和谐振分析结果的正确性。

英文摘要：

The resonance of grid-connected system with the grid-connected multiple inverter bring challenges to the stability of the inverter and power quality of the grid.In order to solve various problems caused by resonance,the impedance model of the system is established and the resonance mechanism of the system is analyzed based on the model.On the basis of mechanism analysis,the relationship among the resonance characteristic ,the number of grid connected inverters and grid strength are studied.And two grid-connected inverters system as an example, simulation and experimental results verify the availability of the model and the accuracy of analytical results.