SSST - Small Signal Stability Toolbox

Resource description

The Small Signal Stability Toolbox (SSST) is a collection of Matlab functions for the analysis and control of small signal stability of power systems. SSST reflects the research efforts of researchers of Instituto de Investigación Tecnológica from 1984 to 2002. It also contains successful techniques developed by other groups.

The main functions of SSST are: load flow solution, output of load flow solution, linear model, eigenvalue analysis, output of the eigenvalue analysis, linear responses, reduced order eigenvalue analysis, sensitivities with respect to FACTS devices modulation, design of a single damping controller and coordinated design of multiple damping controllers.

SSST consists of a series of downloadable digital files, including a reference manual and a user manual. 

NB: these programs were originally written in December, 1993 for version 4.0 of Matlab. They have been revised for version 5.0  in October, 1997

Main link (restricted access)
Version nr : v2002.0.0        
License GNU GPL v3 (or alternative, to be negotiated with UP Comillas)
Asset Owner(s): Comillas (Instituto de Investigación Tecnológica)
Asset Authors: Prof. Luis Rouco et al.
Editor: CRESYM, Square de Meeûs 1000 Brussels (
Fees: Free of charge for non-commercial Use.

For direct, or indirect, commercial Use, please contact

Available associated services:

Service Available? (conditions) Service terms of reference
Promotion  yes (1) See Article 12.1 of the ToRs
Source Management  yes (1) See Article 12.2 of the ToRs
Hosting  yes (1) See Article 12.3 of the ToRs
Distribution  yes (1) See Article 12.4 of the ToRs
Helpdesk  yes (1) See Article 12.5 of the ToRs
Software upgrade  yes (1) See Article 12.6 of the ToRs
Debugging Level 1  yes (1) See Article 12.7 of the ToRs

(1) Free of charge. The User implicitly and automatically accepts the corresponding terms of reference if, and when, resorting to the service.

Excerpt of the general conditions:

As User, you must respect the terms of the Asset License and you implicitly accept it when using the Asset.

As User, you are liable for any consequence of usage and misuse of the Asset and for any Intellectual Property Right infringement while using a Result or set of Results in any way.

You shall indemnify, defend and hold harmless CRESYM and any Owner from, and against, any and all damages, claims, losses, expenses, costs, obligations and liabilities (including, without limitation, reasonable attorney’s fees), suffered directly or indirectly by CRESYM or any Owner arising out of any Intellectual Property Right infringement you commit.

CRESYM commits its best effort to continuously maintain the Asset usable.

Neither CRESYM, nor other Asset Owner(s), shall be liable for any consequence of the technical state of the Asset nor the use and misuse of the Asset by the User.