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A Matlab-based Toolbox for Automatic EMT Modeling and Small-Signal Stability Analysis of Modern Power Systems

Josep Arevalo-Soler, Dionysios Moutevelis, Elia Mateu-Barriendos, Onur Alican, Carlos Collados-Rodriguez, Marc Cheah-Mañe, Eduardo Prieto-Araujo, Oriol Gomis-Bellmunt

TL;DR

This work addresses the need for accurate stability analysis in modern power systems with heavy converter usage by introducing STAMP, a Matlab-based toolbox that automatically generates EMT-based state-space models for hybrid AC/DC networks and enables small-signal stability analysis. It integrates modal, impedance, and passivity analyses within a modular framework that supports both GFM and GFL converter control, initialization from power-flow points, and Simulink visualization. The paper demonstrates STAMP through WSCC and INELFE case studies, highlighting accurate linearization validation against nonlinear EMT simulations and showcasing computation times that scale to larger networks. The toolbox thus offers a practical, open platform for EMT-focused SSA in research and education, with future work aimed at expanding device libraries and adding optimization and fault-analysis capabilities.

Abstract

The intensive integration of power converters is changing the way that power systems operate, leading to the emergence of new types of dynamic phenomena and instabilities. At the same time, converters act as an interface between traditional AC grids and their more recent DC counterparts, giving rise to hybrid AC/DC networks. These conditions increase the necessity for stability analysis tools that can simultaneously account for the newly-introduced dynamic phenomena and can also be applied for the stability study of hybrid networks. This paper presents a Matlab-based toolbox for small-signal analysis of hybrid AC/DC power systems considering electromagnetic-transient (EMT) models. The toolbox allows the automatized modeling of the system from the input data and offers options for modal, impedance and passivity analyses. In the paper, the structure and internal processes of the toolbox are duly discussed, together with all its features, both main and complementary. Its capabilities for stability analysis are demonstrated via comprehensive case studies of converter-based system of various size and topology.

A Matlab-based Toolbox for Automatic EMT Modeling and Small-Signal Stability Analysis of Modern Power Systems

TL;DR

This work addresses the need for accurate stability analysis in modern power systems with heavy converter usage by introducing STAMP, a Matlab-based toolbox that automatically generates EMT-based state-space models for hybrid AC/DC networks and enables small-signal stability analysis. It integrates modal, impedance, and passivity analyses within a modular framework that supports both GFM and GFL converter control, initialization from power-flow points, and Simulink visualization. The paper demonstrates STAMP through WSCC and INELFE case studies, highlighting accurate linearization validation against nonlinear EMT simulations and showcasing computation times that scale to larger networks. The toolbox thus offers a practical, open platform for EMT-focused SSA in research and education, with future work aimed at expanding device libraries and adding optimization and fault-analysis capabilities.

Abstract

The intensive integration of power converters is changing the way that power systems operate, leading to the emergence of new types of dynamic phenomena and instabilities. At the same time, converters act as an interface between traditional AC grids and their more recent DC counterparts, giving rise to hybrid AC/DC networks. These conditions increase the necessity for stability analysis tools that can simultaneously account for the newly-introduced dynamic phenomena and can also be applied for the stability study of hybrid networks. This paper presents a Matlab-based toolbox for small-signal analysis of hybrid AC/DC power systems considering electromagnetic-transient (EMT) models. The toolbox allows the automatized modeling of the system from the input data and offers options for modal, impedance and passivity analyses. In the paper, the structure and internal processes of the toolbox are duly discussed, together with all its features, both main and complementary. Its capabilities for stability analysis are demonstrated via comprehensive case studies of converter-based system of various size and topology.

Paper Structure

This paper contains 31 sections, 15 equations, 11 figures, 2 tables.

Table of Contents

  1. Introduction
  2. Motivation
  3. Discussion on RMS vs EMT Modal Analysis
  4. Literature Review
  5. Contributions
  6. Paper Organization
  7. Small-Signal Modeling
  8. Power System Dynamic Modeling
  9. rms power system modeling
  10. emt linear modeling
  11. Reference Frame Transformations
  12. Impedance representation
  13. Small-signal analysis methods
  14. Modal Analysis
  15. Impedance Analysis
  16. ...and 16 more sections

Figures (11)

  • Figure 1: Flowchart with STAMP structure.
  • Figure 2: Example of state-space model interconnections.
  • Figure 3: $\pi$-section model divided in different subsystems
  • Figure 4: Single-line diagram of the modified WSCC system.
  • Figure 5: Time domain validation of the WSCC linear model.
  • ...and 6 more figures

Theorems & Definitions (4)

  • Definition 1
  • Definition 2
  • Definition 3
  • Definition 4