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首页> 外文期刊>Emerging and Selected Topics in Power Electronics, IEEE Journal of >AC Stability Analysis and dq Frame Impedance Specifications in Power-Electronics-Based Distributed Power Systems
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AC Stability Analysis and dq Frame Impedance Specifications in Power-Electronics-Based Distributed Power Systems

机译：基于电力电子的分布式电源系统中的交流稳定性分析和 dq 框架阻抗规范

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Small-signal stability in balanced three-phase systems is typically investigated by means of the generalized Nyquist stability criterion (GNC) that involves operations on the source and load subsystems' impedance matrices. Eigenvalues of the ratio of these impedance matrices should be calculated for stability judgment. This paper shows that for a power-electronics-based distributed power system, impedance matrices of subsystems can be designed as diagonal dominant. Therefore, stability, in this case, is fully determined by the scalar ratios formed by the impedance elements seen across the d-axis and q-axis interfaces. A three-phase ac system can then be treated as two decoupled dc systems. As a result, the ac stability analysis can also be conducted based on insightful impedance quantities; impedance specification criteria developed for dc systems can be readily applied to ensure stability in ac systems. The major contribution of this paper is related to the simplification of the GNC analysis with good experimental validations. Limitation of the proposed method is that the systems have to work under high power factor condition. However, such limitation is not a problem for many power-electronics-based distributed power systems.
机译：通常通过广义奈奎斯特稳定性标准（GNC）研究平衡三相系统中的小信号稳定性，该标准涉及对源子系统和负载子系统的阻抗矩阵进行操作。这些阻抗矩阵之比的特征值应计算出来，以进行稳定性判断。本文表明，对于基于电力电子的分布式电源系统，子系统的阻抗矩阵可以设计为对角线主导。因此，在这种情况下，稳定性完全取决于在d轴和q轴界面上看到的阻抗元件形成的标量比。然后可以将三相交流系统视为两个解耦的直流系统。结果，也可以基于有洞察力的阻抗量进行交流稳定性分析。为直流系统制定的阻抗规范标准可以很容易地应用于确保交流系统的稳定性。本文的主要贡献与简化GNC分析和良好的实验验证有关。该方法的局限性在于系统必须在高功率因数条件下工作。但是，对于许多基于电力电子的分布式电源系统来说，这样的限制并不是问题。

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