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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。
The smooth switching of microgrids to island operation mode is one of the important means to ensure the continuous and reliable power supply of important loads in microgrid. Taking the microgrid with V / f islanding control as the research object, the small signal model of microgrid in island mode is established and the V / f controller parameters variation, load impedance and line impedance change are analyzed by eigenvalue analysis The process of system small signal stability of the impact of law, and time-domain simulation was verified. Subsequently, the influence of system sensitivity on the dominant eigenvalue under different conditions is discussed. Finally, the main influential parameters and influencing factors of microgrid switching to islanding operation mode are obtained. The conclusions can provide references for the control strategy and strategy of smooth switching of microgrid.