An Efficient Reordering Technique for Incomplete Factorization GMRES Preconditioning: Application in Load Flow Problems
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Jose Eduardo Onoda Pessanha
This paper proposes and tests strategies to accomplish high quality incomplete triangular factors (ILU) preconditioners for iteratively solve the load flow sublinear problem. The process begins constructing the preconditioner over the reordered Jacobian matrix calculated in the first Newton iteration. If the iterative process does not start due to high inaccuracies and/or numerical stability problems emerged during the preconditioner construction, the solution process is restarted and the Jacobian matrix calculated in the first Newton iteration is preprocessed through scaling, nonsymmetric and symmetric (reordered) permutations, leading to a new and better quality preconditioner. Numerical experiments considering two Brazilian power system configurations (2256/3515 buses) operating under adverse conditions (heavy loaded) corroborate the efficiency of such strategies over the preconditioner quality improving the robustness of the iterative solution process. A LU preconditioner and a direct solver for comparison purposes are also considered.
©2011 Walter de Gruyter GmbH & Co. KG, Berlin/Boston
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Articles in the same Issue
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- An Agent Concept for High Fault Tolerance Wide Area Protection
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- Analysis of Damping Torque and Synchronizing Torque Contributed by STATCOM Considering Two Different Damping Schemes
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- Mechanical Protection of Induction Motors by Off-the-Shelf Electrical Protective Relays
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