To address the growing dynamic issues in the power electronics-based power system, this paper proposed an enhanced impedance-based stability analysis which can not only obtain the global view of system dynamics, but also provide a tailor-made stabilization solution by the direct use of the measured black-box models. With the proposed method, the dynamic interactions at selected multiple ports of the system are translated as multiple decoupled single-input single-output (SISO) minor loops in the frequency domain, of which the stability can be readily assessed by the SISO Nyquist stability criterion. Moreover, the oscillation mode shapes, i.e., the relative magnitude and phase of oscillated voltages and currents at the selected ports, are derived mathematically. Furthermore, the frequency-domain participation factor is defined to identify the most contributive components for the oscillations; Through impedance shaping solution of the corresponding oscillatory mode, it also provides the most effective system stability enhancement solution. EMTDC/PSCAD time-domain simulation results from an 800 MW offshore wind energy system with a realistic complexity confirm the effectiveness of the proposed method.

中文翻译：

---

基于 SISO 阻抗的大规模电力电子主导电力系统系统级小信号稳定性评估的稳定性分析

为了解决基于电力电子的电力系统中日益严重的动态问题，本文提出了一种基于阻抗的增强稳定性分析，它不仅可以获得系统动力学的全局视图，而且可以通过直接使用提供量身定制的稳定性解决方案。测量的黑盒模型。使用所提出的方法，系统选定多个端口的动态交互被转换为频域中的多个解耦单输入单输出 (SISO) 次要回路，其稳定性可以通过 SISO 奈奎斯特稳定性准则轻松评估. 此外，振荡模式形状，即所选端口处振荡电压和电流的相对幅度和相位，是从数学上推导出来的。此外，定义频域参与因子以识别对振荡贡献最大的分量；通过对应振荡模式的阻抗整形解决方案，也提供了最有效的系统稳定性增强解决方案。来自具有现实复杂性的 800 MW 海上风能系统的 EMTDC/PSCAD 时域仿真结果证实了所提出方法的有效性。