Abstract | ||
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Large-scale penetration of grid-following inverters into the electricity network presents various technical challenges to grid reliability. It is well-known that the ability of a grid to maintain a stable frequency is inhibited by adding traditional grid-tied photovoltaic (PV) generators. In this work, a detailed model of a simplified grid is presented, and it is shown that the proportion of PV generation and instability are positively correlated. The main instability phenomenon is captured by a Hopf Bifurcation in the field dynamics of the synchronous generator. Such a Hopf bifurcation severely constricts the feasible operating domain of the grid and may hinder normal operation. Modifying traditional grid-tied PV controllers and its impact on grid stability is assessed through small-signal, bifurcation and transient numerical analysis. Traditional PV controllers that are modified to virtual synchronous machine (VSM) type controllers show improvement in system damping. Unlike traditional grid-tied inverters, VSM inverters participate in critical modes of the synchronous generator (SG) and augment the operational domain of the SG+VSM system significantly, more importantly, almost eliminating the need for renewable energy curtailment. A case-study approach is used to present some key results on improvements in damping ratio, feasibility domain and transient stability. Finally, a feasibility domain curve is introduced and discussed in an aim to generalize the overall stability of any such system.
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Year | DOI | Venue |
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2020 | 10.1145/3396851.3397749 | e-Energy '20: The Eleventh ACM International Conference on Future Energy Systems
Virtual Event
Australia
June, 2020 |
DocType | ISSN | ISBN |
Conference | In Proceedings of the Eleventh ACM International Conference on
Future Energy Systems, e-Energy 20, (2020) 314-324 | 978-1-4503-8009-6 |
Citations | PageRank | References |
0 | 0.34 | 0 |
Authors | ||
4 |
Name | Order | Citations | PageRank |
---|---|---|---|
Vishnu A. Vinaya Mohanan | 1 | 0 | 0.34 |
Robin J. Evans | 2 | 1333 | 168.58 |
Iven Mareels | 3 | 884 | 129.28 |
Ramachandra Rao Kolluri | 4 | 6 | 3.14 |