Reduced-Order Model and Stability Analysis of Low-Voltage DC Microgrid
Reduced-Order Model and Stability Analysis of Low-Voltage DC Microgrid
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DOI：
10.1109/tie.2012.2227902
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发表时间：
2013-11
影响因子：
7.7
通讯作者：
S. Anand;B. G. Fernandes
中科院分区：
文献类型：
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作者：
S. Anand;B. G. Fernandes
化石燃料的消耗、能源需求的增加以及对高可靠性电源的需求促使人们使用直流微电网。本文分析了低压直流微电网系统的稳定性。使用基于下垂的分散控制器来控制源。该系统的各个组成部分已被建模。一个线性化的系统模型，采用小信号近似。通过辨识系统矩阵的特征值，分析了系统的稳定性。导出了系统稳定运行的充分条件。它提供了下垂常数的上限，在直流微电网的规划和设计过程中非常有用。此外，系统极点的电缆电阻和电感的变化的灵敏度被确定。证明了随着电感的减小或电阻的增大，磁极在负真实的平面内进一步移动。本文提出的方法适用于任何电源和负载的互联结构。详细的仿真研究验证了分析结果。包括根轨迹图，以确认系统极点的移动。该模型的可行性证实了实验结果从一个按比例缩小的实验室原型的直流微电网开发的目的。
Depleting fossil fuels, increasing energy demand, and need for high-reliability power supply motivate the use of dc microgrids. This paper analyzes the stability of low-voltage dc microgrid systems. Sources are controlled using a droop-based decentralized controller. Various components of the system have been modeled. A linearized system model is derived using small-signal approximation. The stability of the system is analyzed by identifying the eigenvalues of the system matrix. The sufficiency condition for stable operation of the system is derived. It provides upper bound on droop constants and is useful during planning and designing of dc microgrids. Furthermore, the sensitivity of system poles to variation in cable resistance and inductance is identified. It is proved that the poles move further inside the negative real plane with a decrease in inductance or an increase in resistance. The method proposed in this paper is applicable to any interconnecting structure of sources and loads. The results obtained by analysis are verified by detailed simulation study. Root locus plots are included to confirm the movement of system poles. The viability of the model is confirmed by experimental results from a scaled-down laboratory prototype of a dc microgrid developed for the purpose.