Generalized Modal Analysis in Power System with High CIG Penetration: Concept and Quantitative Assessment

TL;DR

This paper introduces a Generalized Modal Analysis (GMA) method for analyzing small-signal stability in power systems with high levels of Converter-Interfaced Generation, providing a versatile and physically interpretable framework.

Contribution

It develops a novel GMA framework that assesses interactions in power systems with high CIG penetration, enabling intuitive and quantitative stability analysis.

Findings

GMA effectively captures dynamic coupling between grid elements.

Numerical simulations validate GMA's accuracy in complex power systems.

The method offers a theoretical basis for future stability studies.

Abstract

This paper presents a Generalized Modal Analysis (GMA) concept for the small-signal stability analysis of power systems with high penetration of Converter-Interfaced Generation (CIG). GMA quantitatively assesses interactions between various elements in the power system, offering intuitive and transparent physical interpretations. The method's versatility in selecting physical quantities at different input and output ports makes it broadly applicable. Based on the concept of GMA, the study further defines interaction quantification indices by selecting voltage ports, examining the impact of grid disturbances on power sources and the support from the power sources to the grid at connection points. Numerical simulations on modified 14-bus and 68-bus systems validate GMA's effectiveness in capturing the coupling of the dynamic characteristics between grid elements. This research provides a theoretical foundation and analytical framework for future analyses of power system stability with diverse power sources.