Evaluation and control of loading margin in electric power systems

Author(s)

Cristiane Lionço Zeferino

• Document type: Doctoral Thesis
• Press: São Carlos.
• Institution: Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD)
• Defense date: 2011-03-28

Examining board members

Geraldo Roberto Martins da Costa; Antonio Roberto Balbo; Edmarcio Antonio Belati; Vivaldo Fernando da Costa; Vanusa Alves de Sousa

• Advisor: Geraldo Roberto Martins da Costa; Vanusa Alves de Sousa

Abstract

This work proposes the determination of the Maximum Loading Point (MLP) in electric power system via Lagrangian Modified Barrier Function (LMBF) method, a variant of Interior Point (IP). The LMBF method is also used to determine which bus, for each system, has the highest sensitivity of load factor, i.e., which bus would be the first to have load shedding in order to increase the loading margin system and thus prevent voltage collapse. To validate this approach, the Sensitivity Analysis (SA) technique was used for the confirmation of the results obtained by the LMBF method. The formulation of the problem considered the equations of power balance of the electrical system equality constraints, and the buses voltage magnitude limits, as well as the limits of reactive power control at the buses of that power inequality constraints. Case studies were conducted in a system of 3 buses and IEEE systems 14, 57, 118 and 300 buses, demonstrating the robustness and efficiency of the proposed algorithms. (AU)

• FAPESP's process: 06/02295-4 - Evaluation and control of the loading margin in electric power systems
• Grantee: Cristiane Lionço Zeferino
• Support Opportunities: Scholarships in Brazil - Doctorate