Solution of power flow and outage problems using diakoptics and compensation

Abstract EN

The paper describes a diakoptical technique for power flow solution of very large size power systems and combines both diakoptics and compensation methods for simulating branch outages without reconstructing or refactorizing the system matrices of the preoutage state.

The proposed technique can either be used in a single-processor computer for sequential solution of torn subdivisions or in a multi-computer configuration (group of single-processor computers or a multiple-processor computer) for a faster solution by parallel processing of torn subdivisions.

It can be used for both off- and on-line applications and can use either the bus impedance matrix or the factorized bus admittance matrix of torn subdivisions.

The proposed technique produces exactly the same power flow solution and retains the convergence property of the original untorn system.

As compared with the full power flow solution of outage problems, the proposed technique provides very accurate results of post-contingent system voltages (magnitude and angle) and line power flows (active and reactive) for single and multiple outage studies in a faster and most economical way.

Included in this paper are procedures for single and parallel processing solution schemes and test results.