Stability assessment of a system comprising a single machine and inverter with scalable ratings

Yashen Lin, Brian Johnson, Vahan Gevorgian, Victor Purba, Sairaj Dhople

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations


Synchronous machines have traditionally acted as the foundation of large-scale electrical infrastructures and their physical properties have formed the cornerstone of system operations. However, with the increased integration of distributed renewable resources and energy-storage technologies, there is a need to systematically acknowledge the dynamics of power-electronics inverters - the primary energy-conversion interface in such systems - in all aspects of modeling, analysis, and control of the bulk power network. In this paper, we assess the properties of coupled machine-inverter systems by studying an elementary system comprised of a synchronous generator, three-phase inverter, and a load. The inverter model is formulated such that its power rating can be scaled continuously across power levels while preserving its closed-loop response. Accordingly, the properties of the machine-inverter system can be assessed for varying ratios of machine-to-inverter power ratings. After linearizing the model and assessing its eigenvalues, we show that system stability is highly dependent on the inverter current controller and machine exciter, thus uncovering a key concern with mixed machine-inverter systems and motivating the need for next-generation grid-stabilizing inverter controls.

Original languageEnglish (US)
Title of host publication2017 North American Power Symposium, NAPS 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538626993
StatePublished - Nov 13 2017
Event2017 North American Power Symposium, NAPS 2017 - Morgantown, United States
Duration: Sep 17 2017Sep 19 2017

Publication series

Name2017 North American Power Symposium, NAPS 2017


Other2017 North American Power Symposium, NAPS 2017
CountryUnited States

Bibliographical note

Funding Information:
All authors were supported by the U.S. Department of Energy (DOE) Solar Energy Technologies Office under Contract No. DE-EE0000-1583. Y. Lin, B. Johnson, and V. Gevorgian were also supported by the DOE under Contract No. DE-AC36-08-GO28308 with NREL; and S. Dhople was also supported by the National Science Foundation under the CAREER award, ECCS-1453921, and grant ECCS-1509277.

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