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A special issue of Sustainability (ISSN 2071-1050).

Deadline for manuscript submissions: closed (31 August 2020) | Viewed by 14070

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Special Issue Editors

Dr. Mehdi Savaghebi

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Guest Editor

Electrical Engineering Section, Mads Clausen Institute, University of Southern Denmark, 5230 Odense, Denmark
Interests: microgrids; smart grids; renewable energies; power quality and harmonics; protection systems; UPS systems
Special Issues, Collections and Topics in MDPI journals

Dr. Hossein Hafezi

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Guest Editor

Faculty of Information Technology and Communication Sciences, Electrical Engineering, Tampere University, Tampere, Finland
Interests: power electronics application in power quality improvement; smart grids; renewable energies integration; DC and hybrid DC-AC distribution systems and microgrids
Special Issues, Collections and Topics in MDPI journals

Dr. Mahdi Shahparasti

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Guest Editor

School of Technology and Innovations, Electrical Engineering, School of Technology and Innovations, University of Vaasa, 65200 Vaasa, Finland
Interests: power electronics; power conversion; power quality; renewable energy integration; microgrids
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Uninterruptible power supply (UPS) systems are vital equipment to reliably feed sensitive and critical loads such as data centers, communication networks, and IT servers. Although conventional UPS systems, including on-line, off-line, and line-interactive UPSs, are currently in use in the industry, more development is still needed to reduce cost/volume and enhance efficiency and reliability.

Prospective authors are invited to submit original contributions or survey papers for publication in Sustainability. Topics of interest for this Special Issue include but are not limited to the following topics in the field of UPS:

Architecture and hardware design;
New power electronics topologies;
Design for reliability and robustness;
Advanced and fault-tolerant control strategies;
Multi-layer (hierarchical) control schemes;
Lifetime modeling, condition monitoring, and failure prediction;
Integration of renewable energy resources;
Innovative (hybrid) energy storage devices;
Energy and battery management systems;
Control and power sharing in parallel UPS configurations;
Medium voltage UPS;
Power quality and protection aspects;
Industrial, experimental, and hardware-in-the-loop tests and validation.

Dr. Mehdi Savaghebi
Dr. Hossein Hafezi
Dr. Mahdi Shahparasti
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sustainability is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

Uninterruptible power supply
Power quality
Protection
Renewable energy systems
(Hybrid) energy storage systems
Power electronics
Battery management systems
Energy management systems.

Published Papers (4 papers)

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Research

19 pages, 7048 KiB

Open AccessArticle

A High Step-Up Partial Power Processing DC/DC T-Source Converter for UPS Application

by Amirhossein Rajaei, Mahdi Shahparasti, Ali Nabinejad and Mehdi Savaghebi

Sustainability 2020, 12(24), 10464; https://doi.org/10.3390/su122410464 - 14 Dec 2020

Cited by 7 | Viewed by 2163

Abstract

In this paper, a new modified structure of a DC/DC T-source converter is proposed. Since the proposed converter provides high voltage gain, it is suitable for photovoltaic integration into uninterruptible power supply (UPS) systems. The proposed structure employs partial power processing technique to increase the output voltage as well as efficiency without requiring new hardware. Partial power converters (PPCs) process only a fraction of flowing power while the remaining power directly flows through output. This generally causes an improvement in efficiency and output voltage. A total of two structures are presented: conventional partial power T-source converters and improved partial power T-source converters. The key advantage of the improved partial power converter is a higher voltage gain. Furthermore, it reduces the voltage and the current stresses on switches and diodes. The steady-state operation principles are described for both converters and the governed rules and equations are derived. The PPCs and full power converter are compared in terms of efficiency, voltage gain, voltage stress, and current stress of converter elements. The converter performance is evaluated through experimental and simulation studies. The presented results show good consistency with the theoretical analysis. Full article

(This article belongs to the Special Issue Uninterruptible Power Supplies (UPS))

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17 pages, 3519 KiB

Open AccessArticle

Fault Loop Impedance Measurement in Circuits Fed by UPS and Principle of Safety Protection

by Jacek Katarzyński and Marek Olesz

Sustainability 2020, 12(23), 10126; https://doi.org/10.3390/su122310126 - 04 Dec 2020

Cited by 3 | Viewed by 4640

Abstract

This paper indicates a significant problem of uncertainty of fault loop impedance (FLI) measurement in circuits powered from uninterruptible power supply (UPS) (double-conversion AC-DC-AC). The correctly determined value of this impedance, related to the short-circuit current disconnection time and to the reference value, is one of the most important elements that determines the approval of an electrical installation and its receivers for operation. To define the principles of FLI measurement, several hundred measurements of the short-circuit loop impedance in the circuits fed by the UPS, in various UPS operation modes and with various FLI instruments, were made, which allowed for the definition of measurement rules that reduce the error in assessing the effectiveness of protection against electric shock by automatic disconnection of supply. Based on the analysis of voltage and current waveforms recorded during the real short-circuit tests in the circuit fed by the UPS, a proprietary algorithm for determining the short-circuit loop impedance has been proposed. Full article

(This article belongs to the Special Issue Uninterruptible Power Supplies (UPS))

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16 pages, 7242 KiB

Open AccessArticle

Enhanced Circular Chain Control for Parallel Operation of Inverters in UPS Systems

by Mahdi Shahparasti, Mehdi Savaghebi, Majid Hosseinpour and Navid Rasekh

Sustainability 2020, 12(19), 8062; https://doi.org/10.3390/su12198062 - 30 Sep 2020

Cited by 7 | Viewed by 2153

Abstract

In this paper, a current sharing method based on the circular chain control (3C) method is proposed for controlling parallel inverters of unequal ratings in uninterruptible power supply (UPS) applications. Due to its circular structure, 3C is one of the most convenient methods which can be used in UPS as well as microgrid systems. However, the conventional 3C control strategy is only applicable to inverters of equal power ratings. The proposed method not only retains the circular structure of the 3C method, but also provides adaptability for the parallel operation of inverters with different power ratings. Moreover, this method adds hot-swap capability to the parallel inverter. A two-loop control structure is used to control the inverters. For proper current sharing, currents of inverters are conveyed in a circular structure with appropriate gains through control links. Simulation and experimental results for linear and nonlinear loads verify the effectiveness of the proposed strategy. Full article

(This article belongs to the Special Issue Uninterruptible Power Supplies (UPS))

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30 pages, 6819 KiB

Open AccessArticle

A Highly Reliable Propulsion System with Onboard Uninterruptible Power Supply for Train Application: Topology and Control

by Hassan Mohammadi Pirouz and Amin Hajizadeh

Sustainability 2020, 12(10), 3943; https://doi.org/10.3390/su12103943 - 12 May 2020

Cited by 5 | Viewed by 3773

Abstract

Providing uninterrupted electricity service aboard the urban trains is of vital importance not only for reliable signaling and accurate traffic management but also for ensuring the safety of passengers and supplying emergency equipment such as lighting and signage systems. Hence, to alleviate power shortages caused by power transmission failures while the uninterruptible power supplies installed in the railway stations are not available, this paper suggests an innovative traction drive topology which is equipped by an onboard hybrid energy storage system for railway vehicles. Besides, to limit currents magnitudes and voltages variations of the feeder during train acceleration and to recuperate braking energy during train deceleration, an energy management strategy is presented. Moreover, a new optimal model predictive method is developed to control the currents of converters and storages as well as the speeds of the two open-end-windings permanent-magnet-synchronous-machines in the intended modular drive, under their constraints. Although to improve control dynamic performance, the control laws are designed as a set of piecewise affine functions from the control signals based on an offline procedure, the controller can still withstand real-time non-measurable disturbances. The effectiveness of proposed multifunctional propulsion topology and the feasibility of the designed controller are demonstrated by simulation and experimental results. Full article

(This article belongs to the Special Issue Uninterruptible Power Supplies (UPS))

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