Small Signal Stability of a Series Compensated Microgrid Operating in Islanded Mode

2020 Intermountain Engineering, Technology and Computing (IETC) Pub Date : 2020-10-02 DOI:10.1109/IETC47856.2020.9249202

Jonathan Devadason, P. Moses

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Abstract

In this paper, small signal stability of a simple microgrid operating in islanded mode is analyzed by computing eigen value trajectories when the system is subjected to different parametric changes. Detailed mathematical modeling of a synchronous machine supplying a constant impedance load through a series compensated line is presented. The system is equipped with a speed governor and an Automatic Voltage Regulator (AVR) with a PI controller. Eigen value trajectories of the linearized system are computed by considering parametric changes in the load, degree of compensation, exciter gain and time constant, proportional and integral gains of the PI controller of the AVR and the droop of the speed governor. From the results obtained, it was observed that the system is subjected to oscillatory instability when the AVR parameters and the speed governor droop exceeded certain limits. Also, the system was completely stable when the load and the degree of compensation was varied in a wide range. These results indicate the importance of selection of proper values for parameters of microgrids operating in islanded mode.

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孤岛模式串联补偿微电网的小信号稳定性

本文通过计算系统在不同参数变化下的特征值轨迹，分析了孤岛模式下简单微电网的小信号稳定性。给出了同步电机通过串联补偿线提供恒阻抗负载的详细数学模型。该系统配备了一个调速器和一个带有PI控制器的自动电压调节器(AVR)。考虑负载、补偿度、激振器增益和时间常数、AVR PI控制器的比例增益和积分增益以及调速器的下垂等参数变化，计算线性化系统的特征值轨迹。结果表明，当AVR参数和调速器下垂超过一定限度时，系统会发生振荡不稳定。当负载和补偿程度在较大范围内变化时，系统是完全稳定的。这些结果表明孤岛状态下微电网参数选择的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2020 Intermountain Engineering, Technology and Computing (IETC)

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