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This paper describes a new algorithm to compute the dominant poles of a high-order scalar transfer function. The algorithm, called the Subspace Accelerated Dominant Pole Algorithm (SADPA), is more robust than existing methods in finding both real and complex dominant poles, and faster because of subspace acceleration. SADPA is able to compute the full set… (More)

- Joost Rommes, Nelson Martins
- SIAM J. Scientific Computing
- 2008

A new algorithm for the computation of dominant poles of transfer functions of large-scale second-order dynamical systems is presented: the quadratic dominant pole algorithm (QDPA). The algorithm works directly with the system matrices of the original system, so no linearization is needed. To improve global convergence, the QDPA uses subspace acceleration,… (More)

- Nelson Martins, Paulo E. M. Quintão, Alex de Castro, Herminio Pinto, Juan Sanchez-Gasca, Mike J. Gibbard
- 2003

• Recent developments and increased use of modal analysis in studies of electrical, mechanical and civil engineering as well as in many other fields • Good opportunities for use of modal equivalents in power system dynamics and control, harmonic analysis and real-time simulations of electromagnetic transients • The concept of transfer function pole… (More)

This paper describes a new algorithm to compute the dominant poles of a high-order multi-input multi-output (MIMO) transfer function. The algorithm, called the Subspace Accelerated MIMO Dominant Pole Algorithm (SAMDP), is able to compute the full set of dominant poles efficiently. SAMDP can be used to produce good modal equivalents automatically. The… (More)

—Diabetic retinopathy has been revealed as the most common cause of blindness among people of working age. For monitoring the pathology image registration algorithms applied to retinal images is very useful. In this work, a novel vessel-based retinal image registration approach is proposed. The segmentation of the vasculature is performed by a multi-agent… (More)

- Nelson Martins, Herminio J.C.P. Pinto, John J. Paserba
- 1999

This paper describes, in a tutorial manner, TCSC control aspects illustrated through simulation results on a small power system model. The analysis and design of the TCSC controls, to schedule line power and damp system oscillations, are based on modal analysis. and time and frequency response techniques. Transient stability results are included, to… (More)

This paper describes a new algorithm, named the Sensitive Pole Algorithm, for the automatic computation of the eigenvalues (poles) most sensitive to parameter changes in large-scale system matrices. The effectiveness and robustness of the algorithm in tracing root-locus plots is illustrated by numerical results from the small-signal stability analysis of… (More)

- Nelson Martins, Hermínio J.C.P. Pinto
- 2003

This paper describes the state-of-the-art on the small-signal stability analysis and design of FACTS assisted power systems. The benefits of integrating all these tools into a comprehensive package and properly employing graphical interface, including animation of algorithm results, are highly emphasized. Until the early eighties, the small signal stability… (More)

This paper describes efficient algorithms for the computation of dominant zeros of large scale transfer functions. The transfer function zeros are demonstrated to be equal to the poles of a new inverse system, which is valid even for the strictly proper case. This is a new finding, which is important from practical as well as theoretical viewpoints. Hence,… (More)

A new algorithm for the computation of dominant poles of transfer functions of large-scale second-order dynamical systems is presented: Quadratic Dominant Pole Algorithm (QDPA). The algorithm works directly with the system matrices of the original system, so no lin-earization is needed. To improve global convergence, QDPA uses subspace acceleration, and… (More)