A Model-Based Approach for Small-Signal Stability Assessment of Unbalanced Power Systems

Author(s)

Salim, Rodrigo Hartstein ^[1] ; Ramos, Rodrigo Andrade ^[1]

Affiliation

^[1] Univ Sao Paulo, BR-13566590 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: IEEE Transactions on Power Systems; v. 27, n. 4, p. 2006-2014, NOV 2012.
• Web of Science Citations: 23

Abstract

In this paper, a modeling technique for small-signal stability assessment of unbalanced power systems is presented. Since power distribution systems are inherently unbalanced, due to its lines and loads characteristics, and the penetration of distributed generation into these systems is increasing nowadays, such a tool is needed in order to ensure a secure and reliable operation of these systems. The main contribution of this paper is the development of a phasor-based model for the study of dynamic phenomena in unbalanced power systems. Using an assumption on the net torque of the generator, it is possible to precisely define an equilibrium point for the phasor model of the system, thus enabling its linearization around this point, and, consequently, its eigenvalue/eigenvector analysis for small-signal stability assessment. The modeling technique presented here was compared to the dynamic behavior observed in ATP simulations and the results show that, for the generator and controller models used, the proposed modeling approach is adequate and yields reliable and precise results. (AU)

• FAPESP's process: 08/03876-6 - Assessment of the impact of damping controllers in the power quality of distribution systems with the insertion of cogeneration
• Grantee: Rodrigo Hartstein Salim
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 09/17920-0 - Development of a complete framework for stability studies in distribution systems with the connection of synchronous generators
• Grantee: Rodrigo Andrade Ramos
• Support Opportunities: Regular Research Grants