Chika O. Nwankpa

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This paper describes MATLAB/Simulink implementation of three induction motor tests, namely dc, no-load, and blocked-rotor tests performed to identify equivalent circuit parameters. These simulation models are developed to support and enhance electric machinery education at the undergraduate level. The proposed tests have been successfully integrated into(More)
This paper reports on an FPGA implementation of sparse LU decomposition. The resulting special purpose hardware is geared towards power system problems load flow computation which are typically solved iteratively using Newton Raphson. The key step in this process, which takes approximately 85% of the computation time, is the solution of sparse linear(More)
In this paper, we present an efficient algorithm to compute singular points and singularity-induced bifurcation points of differential-algebraic equations for a multimachine power-system model. Power systems are often modeled as a set of differential-algebraic equations (DAE) whose algebraic part brings singularity issues into dynamic stability assessment(More)
1 The research reported in this paper was supported by the United States Department of Energy (DOE) under Grant No. CH11171. The authors are also grateful to PJM Interconnection for data provided. Abstract – Full-AC load flow constitutes a core computation in power system analysis. Current techniques for solving full-AC load flow rely on the iterative(More)
Load flow computation and contingency analysis is the foundation of power system analysis. Numerical solution to load flow equations are typically computed using Newton-Raphson iteration, and the most time consuming component of the computation is the solution of a sparse linear system needed for the update each iteration. When an appropriate elimination(More)
This article describes MATLAB/Simulink realization of open-circuit and short-circuit tests of transformers that are performed to identify equivalent circuit parameters. These simulation models are developed to support and enhance electric machinery education at the undergraduate level. The proposed tests have been successfully integrated into electric(More)
Data centers, being major consumers of power, can play an important role in the efficient operation of electrical grids. This paper develops an optimization framework to allow data centers to operate as controllable load resources within the demand dispatch regime, a demand response (DR) program in which incentives are designed to induce lower electricity(More)
Accurate analog models of power system components are required in order to realize an analog computation engine for power systems. Analog computation is an area of continued interest. Among the advantages over traditional digital methods are physically realizable solutions and faster computation times. This paper focuses on the design, simulation, and(More)
This paper presents a Matlab-based voltage stability toolbox (VST) designed to analyze bifurcation and voltage stability problems in electric power systems. VST combines proven computational and analytical capabilities of bifurcation theory, and symbolic implementation and graphical representation capabilities of Matlab and its toolboxes. The motivation for(More)