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中文摘要：
微电网平稳切换至孤岛运行模式是保证微电网内重要负荷持续可靠供电的重要手段之一。以V/f孤岛控制方式的微电网为研究对象,建立了孤岛模式下的微电网小信号模型,并利用特征根分析法分析了V/f控制器参数变化、负荷阻抗及线路阻抗变化对切换过程中系统小信号稳定性的影响规律,并用时域仿真进行了验证。其后,讨论了系统不同工况下对主导特征值的参数灵敏度的影响规律。最终获得了保证微电网平稳切换至孤岛运行模式的主导影响参数和影响因素,其结论可为微电网平滑切换控制方法和策略提供参考。
英文摘要：
Smooth-switching of microgrid to islanded mode is of the important to guarantee the continuous power supply to the important loads. This paper firstly studies the V/f controller of the microgrid that operates in islanded mode, and establishes a small-signal state space model for inverter based on the V/f controller. Then the eigenvalues are used to analyze the stability in the smooth-switching when the V/f controller parameters, the load impedance and the equivalent line impedance change. The results are verified by time-domain simulations. Secondly, the sensitivity of the parameters to the dominant eigenvalues is analyzed when the power load level changes. Finally, the dominant parameters and factors that can guarantee the microgrid to achieve smooth-switching are obtained, which can be the reference for the switching control methods and strategies.
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