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Browsing by Author "Nasr-Azadani, Ehsan"

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    Stability Analysis of Unbalanced Distribution Systems With Synchronous Machine and DFIG Based Distributed Generators
    (Institute of Electrical and Electronics Engineers (IEEE), 2014-07-30) Nasr-Azadani, Ehsan; Canizares, Claudio A.; Olivares, Daniel E.; Bhattacharya, Kankar
    There are many technical aspects and challenges in distributed generation (DG) that have not been properly understood and addressed so far. Distribution systems cannot be considered as balanced three-phase systems, because these are inherently unbalanced in steady-state operation. A full characterization of the unbalanced system with respect to system stability allows a better understanding of the dynamic behavior of such systems. This paper presents a comprehensive investigation of the effects of system unbalance on the stability of the distribution systems with synchronous generator (SG) and doubly-fed induction generator (DFIG) based DG units at different loading levels. Detailed steady-state and dynamic analyses of the system are performed. Based on classical voltage, small-perturbation and transient stability studies, it is demonstrated that system unbalance can significantly affect the distribution system dynamic performance, in ways that have not been discussed in the technical literature so far. A simple and effective control strategy based on an Unbalanced Voltage Stabilizer (UVS) is also proposed to improve the system control and the stability of unbalanced distribution systems with SG and DFIG. Eigenvalue analyses and time-domain simulations (TDS) demonstrate the effectiveness of the proposed UVS for unbalance conditions.
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    The Canadian Renewable Energy Laboratory: A testbed for microgrids
    (Institute of Electrical and Electronics Engineers (IEEE), 2020-03-04) Nasr-Azadani, Ehsan; Su, Peter; Zheng, Wenda; Rajda, Janos; Canizares, Claudio; Kazerani, Mehrdad; Veneman, Erik; Cress, Stephen; Wittemund, Michael; Manjunath, Manoj Rao; Wrathall, Nicolas; Carter, Mike
    This article presents a test facility for design validation of microgrids with high penetration of renewable energy, developed as a joint effort with industry, government, and academia. The Canadian Renewable Energy Laboratory (CANREL) described here is a physical simulation tool for the design, development, and performance testing of islanded and grid-connected microgrid projects. CANREL is equipped with a diesel generator, different renewable energy sources, various renewable energy generation simulators and physical systems, a bidirectional power-flow grid simulator, a battery- based energy-storage system, and controllable resistive?inductive?capacitive and electronic test loads for the design and testing of a variety of microgrid solutions. The test facility provides project performance demonstration and validation services at each stage of a microgrid project development to help utilities and project developers reduce risks. It is also a physical simulation tool for benchmarking microgrid equipment and controllers for research and development purposes. Some facility test results are presented in this article to demonstrate the capabilities of CANREL for simulating a wide range of scenarios.