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Online ISSN 1752-1424
Print ISSN 1752-1416

IET Renewable Power Generation (RPG) brings together the topics of renewable energy technology, power generation and systems integration, with techno-economic issues. All renewable energy generation technologies are within the scope of the journal.

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Impact Factor: 3.488
5-year Impact Factor: 3.760
CiteScore: 4.180
SNIP: 1.456
SJR: 0.979

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Research Highlights

Mahfuz A. Shuvra

Mahfuz A. Shuvra, University of North Carolina at Charlotte, USA

Distributed dynamic grid support using smart PV inverters during unbalanced grid faults

The recently introduced IEEE 1547a-2018 standard requires that inverters for photovoltaic system to ride through momentary faults. One way to remain connected to the grid is to inject reactive current dynamically which reduces the active power contribution to the faulty location. However, it is challenging to find the appropriate and optimal active and reactive current reference signals and successful interchange (within a few milli-seconds) between them during a momentary fault. This paper first introduces a new mathematical method to calculate the reference current of the PV inverter based on Karush–Kuhn–Tucker conditions, to ensure optimality, and X/R ratio of the line, to support weak and strong grid conditions. The paper proposes a dynamic voltage support strategy of PV inverters and a new coordination approach between multiple inverters connected to the same grid that does not need expensive an communication structure. The proposed control has been verified thorough simulations and experiments - Pietro Tricoli, Deputy Editor in Chief

"The research shows promise of controlling inverter in a 'network-cognizant' way so that it successfully senses the fault condition, adapts to the feeder characteristics and dynamically counteracts the emergency low-voltage situation in an optimal way." - Mahfuz A. Shuvra, Author

Free to read the full paper here until March 31st 2019

Mohsen Eskandari

Mohsen Eskandari, University of Technology Sydney, Australia

Microgrid operation improvement by adaptive virtual impedance

Although decentralised controllers like droop controllers are very attractive for microgrids, they have significant limitations on their performance and require a compromise between power quality and power sharing. To overcome this limitation, this paper introduces the novel concept of adaptive virtual impedance that not only enables the traditional f-P and v-Q controllers, but also additional control functions to improve the operations of the microgrid. The paper in particular explores how the virtual impedance can be controlled to decouple the active and reactive power control, maximise the transferable power and improve the stability margins. Therefore, the proposed method has a potential application for all the microgrids where the various types of distributed sources have different capabilities of contributing to the voltage and frequency regulation of the system. - Pietro Tricoli, Deputy Editor in Chief

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