Geometric parameterization techniques for continuation power flow

• Grant number: 10/07229-5
• Support Opportunities: Regular Research Grants
• Start date: July 01, 2010
• End date: June 30, 2011
• Field of knowledge: Engineering - Electrical Engineering - Power Systems
• Principal Investigator: Dilson Amancio Alves
• Grantee: Dilson Amancio Alves
• Host Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil

Abstract

This project intends to propose and to evaluate the use of global variables in the parameterization step of the continuation power flow and to compare its efficiency with the ones used in previous works. The technique has already been improved starting from the previously developed techniques [Garbelini et al., 2006], where the singularity of the Jacobian matrix is eliminated by the addition of line equations. The use of global variables is not recent and it has been attracting a lot of interest along the years, as it can be observed from several references (Iba et al., 1991; Chiang et al. 1995; Garbelini et al., 2006; Zhao e Zhang, 2006; Li e Chiang, 2008). That is due to the fact that, in general, the use of those variables provides some advantages, e.g., it is not necessary to change the parameter throughout the P-V curve; and the curvature of the solution trajectories have the same behavior, which simplifies the determination of the necessary steps for the successful determination of the loading margins. Another important point is related with the interest of electrical utilities in CPU time reduction of P-V curve tracing algorithms used in power system planning and operation stages. That interest is due to the need to define the loading margins and the necessary control actions for normal operating condition (base case) and for different operating points and contingency conditions. Therefore, this project also intends to investigate the possibility of reduction of the required computational time for tracing the P-V curve. Instead of updating the Jacobian matrix at every iteration, the procedure of updating it only when the system undergoes a significant change is already being evaluated by the proponent. (AU)