This is a data acquisition-based methodology to construct a state-space model of black-box Voltage Source Converters (VSCs) for application in small-signal stability analysis in modern power-systems using the Component Connection Method (CCM). This approach determines the fitted state-space (FSS) model through the frequency-domain (FD) admittance matrix of the VSC, identified via the input-output responses of voltage and current at the point of connection (POC). By applying a multiple single-input single-output (SISO) vector fitting array, a stable FSS representation is determined with high accuracy. Order reduction methodologies such as Singular Value Decomposition (SVD) and Balanced Realization (BR) are then employed to generate the minimal representation of the VSC, eliminating redundant states and reducing computational burden.
Full access to the tool will be provided once the presented paper is published in the IEEE PES Procedings of ISGT 2025 conference. For now, this repository only contains the IEEE 9-bus system and New England parameters used in the case study submitted to the ISGT 2025 conference and for the PSCC 2026 Conference.
- See the file: "IEEE9_GFL_GFM.xlsx"
- See the file: "New_England.xlsx"
- Copy the function files to the common project folder.
- Use the function "fitss2" to determine the fitted state-space model.
Check the file "example_fitss.m" and follow the structure of the inputs and outputs (the functions and the script will be updated).
Garcia-Reyes, Luis A.; Prieto-Araujo, Eduardo; A. Lacerda, Vinícius; Arévalo-Soler, Josep; Gomis-Bellmunt, Oriol; Martin-Almenta, Macarena; Nuño-Martínez, Edgar; Renedo, Javier, "Data-Driven State-Space Modeling for Small-Signal Stability Analysis of Black-Box Power Converters", in Procedings of 2025 IEEE PES Innovative Smart Grid Technologies Europe (ISGT EUROPE).