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    Evaluation of the static performance of a simulation-stimulation interface for power hardware in the Loop
    (2003) Ayasun S.; Fischl R.; Chmielewski T.; Vallieu S.; Miu K.; Nwankpa C.
    This paper gives an evaluation framework of the static performance of a Simulation-Stimulation Interface (SSI) for Power Hardware in the Loop (PHIL) applications. The PHIL system is a hybrid system consisting of Hardware-Under-Test (HUT) connected to a Virtual Rest of the Power System (VROPS) via a Simulation-Stimulation Interface (SSI). The SSI maps the discrete time input/output signals of the VROPS to the continuous time power input/output signals of the HUT. Ideally, the performance of the PHIL should be the same as the actual power system consisting of the HUT connected to the Rest of the System hardware. The evaluation of the PHIL performance is made in terms of its electric power matching capability. Since the SSI is the key component affecting the power matching, this paper evaluates the effect of the SSI parameters on the static performance of PHIL, specifically, the power system loadability/maximum power transfer. The results are illustrated using P-Q curves of simple 2-bus l? system consisting of a generator, line and RL load. An experimental system was used to generate the baseline data for the simulation that was performed using Simulink. The study concentrated on the effect of time delay encountered in the SSI and VROPS processing on the maximum power transfer (i.e., P-Q curves) of the PHIL relative to that of the experimental system. The results show the decrease in maximum power transfer capability as the time delay increases to 1 msec. © 2003 IEEE.
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    Symbolic analysis and simulation for power system dynamic performance assessment
    (2005) Ayasun S.; Dafis C.; Nwankpa C.; Kwatny H.
    This paper presents a MATLAB-based Voltage Stability Toolbox (VST) designed to analyze bifurcations, voltage stability problems and nonlinear observability in electric power systems. VST combines proven computational and analytical capabilities of stability and observability theory, symbolic implementation and graphical representation capabilities of MATLAB and its Toolboxes. The motivation for developing the package is to provide a flexible simulation environment for ongoing research conducted at Drexel University's Center for Electric Power Engineering (CEPE), and to enhance undergraduate/graduate power engineering courses. VST is a very flexible tool for load flow, small-signal and transient stability, bifurcation and observability analysis. To illustrat 1e the capabilities of VST, simulations using the IEEE 14 bus system are presented. ©2005 IEEE.