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Dear Colleagues,

A constant increase in renewable energy deployments and nonconventional technology has changed the operation paradigms of power systems. Bilateral power flows, fault contribution of distributed generators, and the unknown fault behavior of new equipment call for fundamental changes in protection approaches. Innovative ideas are required to come up with new protection coordination solutions. Extensive communication solutions are deployed to increase monitoring capability, while data analysis techniques can be utilized to process a large amount of data. Edge computing can be utilized to decrease the burden on centralized coordination schemes, while novel optimization algorithms can be implemented to create better-performing systems. This Special Issue is aimed at covering different aspects of ground-breaking protection system designs to achieve deep penetration of renewable and clean energy systems. In this regard, papers are solicited in, among others, the following topics:

Advanced communication solutions between protection equipment;
Novel implementation of nature inspired algorithms for protection coordination;
Power electronics design and control for improving fault behavior of inverters;
Standardized communication solutions for interoperability, such as IEC61850 and IEEE 1547;
Cybersecurity considerations to ensure proper operation;
Edge-computing-based solutions for intelligent protection.

Prof. Dr. Taha Selim Ustun
Guest Editor

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Keywords

genetic algorithms
nature-inspired algorithms
coordinated control
centralized control
power system automation
distributed control
relays
inverters
fault current limiters
cybersecurity in smart grids
phasor measurement units (PMU)
SCADA

Published Papers (1 paper)

Research

18 pages, 9281 KiB

Open AccessEditor’s ChoiceArticle

Power Hardware in-the-Loop Testing to Analyze Fault Behavior of Smart Inverters in Distribution Networks

by Taha Selim Ustun, Shuichi Sugahara, Masaichi Suzuki, Jun Hashimoto and Kenji Otani

Sustainability 2020, 12(22), 9365; https://0-doi-org.brum.beds.ac.uk/10.3390/su12229365 - 11 Nov 2020

Cited by 12 | Viewed by 1673

Abstract

Deep penetration of distributed generators have created several stability and operation issues for power systems. In order to address these, inverters with advanced capabilities such as frequency and reactive power support the grid. Known also as Smart Inverters (SIs), these devices are highly dynamic and contribute to the power flow in the system. Notwithstanding their benefits, such dynamic devices are new to distribution networks. Power system operators are very reluctant toward such changes as they may cause unknown issues. In order to alleviate these concerns and facilitate SIs integration to the grid, behavior studies are required. To that end, this paper presents a power hardware-in-the-loop test set up and tests that are performed to study fault behavior of SIs connected to distribution networks. The details of the software model, SI integration with the real-time simulator, test results, and their analyses are presented. This experience shows that it is not trivial to connect such novel devices with simulation environments. Adjustments are required on both software and hardware fronts on a case-by-case basis. The encountered integration issues and their solutions are presented herein. The fault behavior of the SI with respect to the fault location is documented. It is observed that for faults that are close to SIs, momentary cessation of generation is observed. This needs to be tackled by device manufacturers as this phenomenon is very detrimental to health of a power system under fault conditions. Extensive PHIL test results show that several factors affect the fault behavior of an SI: fault location and its duration, SI mode of operation as well as extra devices housed in the casing. These results and their in-depth analyses are presented for a thorough understanding of SI behavior under fault conditions. Full article

(This article belongs to the Special Issue Dynamic Protection of Power Systems with a High Penetration of Renewables)

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