Three-Phase Unbalanced Transient Dynamics and Powerflow for Modeling Distribution Systems With Synchronous Machines

Elizondo, Marcelo A.; Tuffner, Francis K.; Schneider, Kevin P.

doi:10.1109/tpwrs.2015.2389712

Title: Three-Phase Unbalanced Transient Dynamics and Powerflow for Modeling Distribution Systems With Synchronous Machines

Journal Article · Wed Jan 28 00:00:00 EST 2015 · IEEE Transactions on Power Systems

DOI:https://doi.org/10.1109/tpwrs.2015.2389712· OSTI ID:1233756

Elizondo, Marcelo A. ^[1]; Tuffner, Francis K. ^[1]; Schneider, Kevin P. ^[1]

Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Unlike transmission systems, distribution feeders in North America operate under unbalanced conditions at all times, and generally have a single strong voltage source. When a distribution feeder is connected to a strong substation source, the system is dynamically very stable, even for large transients. However if a distribution feeder, or part of the feeder, is separated from the substation and begins to operate as an islanded microgrid, transient dynamics become more of an issue. To assess the impact of transient dynamics at the distribution level, it is not appropriate to use traditional transmission solvers, which generally assume transposed lines and balanced loads. Full electromagnetic solvers capture a high level of detail, but it is difficult to model large systems because of the required detail. This paper proposes an electromechanical transient model of synchronous machine for distribution-level modeling and microgrids. This approach includes not only the machine model, but also its interface with an unbalanced network solver, and a powerflow method to solve unbalanced conditions without a strong reference bus. The presented method is validated against a full electromagnetic transient simulation.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Electricity (OE)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1233756

Report Number(s):: PNNL-SA-101865; TE1201000

Journal Information:: IEEE Transactions on Power Systems, Vol. 31, Issue 1; ISSN 0885-8950

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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References (11)

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24 POWER TRANSMISSION AND DISTRIBUTION
distribution systems
machine models
microgrids
transient stability
unbalanced operation

Title: Three-Phase Unbalanced Transient Dynamics and Powerflow for Modeling Distribution Systems With Synchronous Machines

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