微电网安全可靠的运行离不开精确地控制和保护。由于微电网中微电源自身的特点，使孤岛微电网中的电气量的变化在故障情况下与传统大电网有很大的差别。因此，研究不同故障情况下 IBDG 的运行特性以及它们对微电网系统故障特性的影响至关重要。本文研究了孤岛微电网不对称故障模式下 IBDG 的运行特性，对电气量的变化做出了定性分析。在不对称故障情况下针对传统的限流造成的电压电流畸变，采用无畸变限流方法，减少系统中的谐波分量。利用Matlab/Simulink 仿真软件搭建了由三台逆变器组成的微电网的仿真模型，设置故障参数并进行仿真研究，验证对微电网故障情况下IBDG的运行特性及无畸变限流理论分析的正确性。%Safe and reliable operation of microgrid cannot do without precise control and protection. Due to the characteristics of the microsources of microgrid, the changes of the electric parameters of isolated microgrid under fault condition have a big difference with the traditional power grid. So it is essential to study the operation characteristics of IBDG under different fault conditions and their influence on the fault characteristics of microgrid system. This paper studied the operation characteristics of IBDG under asymmetrical fault modes of isolated microgrid, and the variation of the electric quantity is analyzed qualitatively. In the case of asymmetric fault, the comparison and analysis are made for the different current limiting methods. The analysis shows that the method of distortion-free current limitation can greatly reduce the harmonic component in the system. On the basis of analyzing the operation characteristics of IBDG under the fault conditions of microgrid, the fault characteristics of microgrid are also analyzed simply. a simulation model of microgrid made up of three inverters is established by using Matlab/Simulink simulation software, setting up the fault parameters and starting simulation, to verify the correctness of the theoretical analysis of the operation characteristics of IBDG and distortion-free current limitation under the fault conditions of microgrid.
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