This paper presents an approach to obtain reduced-order models for power networks involving power electronic converters (PEC) via the frequency-domain balanced realizations (FDBR) technique. PECs play an essential role in power processing and energy conversion in modern electrical networks, such as the interconnection of renewable generators, HVDC links, and active filters. Integration of PECs into dynamic equivalents needs model-order reduction (MOR) in both low- and high-frequency ranges to account for both slow and fast dynamics due to the network and switching natures. The objective of the FDBR technique is to obtain an internally balanced system, i.e., an equally controllable/observable system, that can be reduced according to its dominant dynamics within the limited frequency bandwidths. This allows accounting for specific band-limited phenomena, such as those generated within a power network caused by PECs, which is the focus of this paper. The results show that faster yet accurate simulations are achieved by reduced-order models through FDBR compared to their full-order counterparts.

中文翻译：

---

用于 EMT 研究的嵌入电力网络的 HVDC 链路的双频带降阶模型

本文提出了一种通过频域平衡实现 (FDBR) 技术获得包含电力电子转换器 (PEC) 的电力网络降阶模型的方法。PEC 在现代电网中的功率处理和能量转换中发挥着重要作用，例如可再生发电机、HVDC 链路和有源滤波器的互连。将 PEC 集成到动态等效项中需要在低频和高频范围内进行模型降阶 (MOR)，以解决由于网络和开关性质导致的慢速和快速动态。FDBR 技术的目标是获得一个内部平衡的系统，即一个同样可控/可观测的系统，可以根据其在有限频率带宽内的主要动态来减少该系统。这允许考虑特定的频带限制现象，例如由 PEC 引起的电力网络内产生的现象，这是本文的重点。结果表明，与全阶对应模型相比，通过 FDBR 的降阶模型可以实现更快而准确的模拟。