@article{weiss_abu-jaradeh_chakrabortty_jamehbozorg_habibi-ashrafi_salazar_2016, title={A wide-area SVC controller design for inter-area oscillation damping in WECC based on a structured dynamic equivalent model}, volume={133}, ISSN={["1873-2046"]}, DOI={10.1016/j.epsr.2015.11.009}, abstractNote={Abstract In our recent work [1] , we constructed a reduced-order model of the Western Electricity Coordinating Council (WECC) power system using mathematically derived parameters from real Synchrophasor data. These parameters include inter and intra-area impedances, inertias, and damping factors for aggregate synchronous generators representing five geographical, and yet coherent, areas of WECC. In this paper, we use this reduced-order model as a tool to design a supplementary controller for a Static VAr Compensator (SVC), located at the terminal bus of one of the aggregate generators. Wide-area feedback consisting of phase angle and frequency measurements from Phasor Measurement Units (PMUs) in the other areas is used to design this controller. The objective is to damp the inter-machine oscillation modes of the reduced-order model, which in the full-order system corresponds to inter-area oscillations. The controller input is chosen via statistical variance analysis, and its parameters are tuned to improve the damping factors of the slow modes. The model is implemented in a real-time digital simulator, and validated using a wide range of disturbance scenarios. The closed-loop system is observed to be highly robust to all of these disturbances as well as the choice of operating points. Detailed experimental analyses of the capacity of the SVC to satisfy the damping specifications of supplementary control are also presented via multiple contingencies. The results are promising in aiding damping of inter-area modes in WECC, especially at a time of increasing penetration of wind and other renewable resources.}, journal={ELECTRIC POWER SYSTEMS RESEARCH}, author={Weiss, Matthew and Abu-Jaradeh, Backer N. and Chakrabortty, Aranya and Jamehbozorg, Arash and Habibi-Ashrafi, Farrokh and Salazar, Armando}, year={2016}, month={Apr}, pages={1–11} }
 @inproceedings{weiss_chakrabortty_ashrafi_jamehbozorg_ahu-jaradeh_2015, title={A Wide-area SVC controller design using a dynamic equivalent model of WECC}, DOI={10.1109/pesgm.2015.7286605}, abstractNote={In our recent work [1] we constructed a reduced-order five-area model of the Western Electricity Coordinating Council (WECC) power system using mathematically derived parameters from real PMU data. These parameters include inter and intra-area impedances, inertias, and damping values for aggregate machines representing five geographic areas. In this paper we use this reduced-order model as a tool to design an SVC controller to damp the inter-machine oscillation modes, which in the full-order model corresponds to inter-area oscillations. The controller input is chosen via statistical variance analysis, and its parameters are tuned to improve slow mode damping. The model is implemented in a real-time digital simulator, and emulated for various disturbance scenarios to illustrate the effectiveness of the SVC using a metric for dynamic performance. The resulting closed-loop response is promising in aiding damping of inter-area modes in the WECC, especially at a time of increasing penetration of wind and other renewable resources.}, booktitle={2015 ieee power & energy society general meeting}, author={Weiss, M. and Chakrabortty, Aranya and Ashrafi, F. H. and Jamehbozorg, A. and Ahu-Jaradeh, B. N.}, year={2015} }
 @inproceedings{chandra_weiss_chakrabortty_gayme_2014, title={Impact analysis of wind power injection on time-scale separation of power system oscillations}, DOI={10.1109/pesgm.2014.6938975}, abstractNote={In this work, we present an analytical relationship between the two time-scale behavior of coherent power system networks with increasing levels of wind penetration. We first derive a mathematical model coupling the electro-mechanical swing dynamics of the grid integrated with the dynamics of a doubly-fed induction machine via power flow. We then consider the system to be comprised of r coherent areas and apply a similarity transformation to explicitly show that the integrated system may exhibit a three time-scale behavior depending on the amount of wind power injection. This effect is illustrated using simulations of a model of the US Western Interconnection.}, booktitle={2014 ieee pes general meeting - conference & exposition}, author={Chandra, S. and Weiss, M. D. and Chakrabortty, Aranya and Gayme, D. F.}, year={2014} }