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Power Electronics Technologies for Micro and Nano Grids: Dynamics, Analysis, Control and Design

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A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F: Electrical Engineering".

Deadline for manuscript submissions: closed (30 September 2019) | Viewed by 15891

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Prof. Dr. Abdelali El Aroudi

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Departament d´Enginyeria Electronica, Electrica i Automatica, Universitat Rovira i Virgili, Tarragona, Spain
Interests: power electronics; energy conversion systems; PV and EV applications of power electronics circuits; dynamics and control of energy conversion systems; harmonics mitigation; control systems; power factor correction; stability analysis; non-linear control; robust control; sliding mode control
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Prof. Dr. Herbert Ho-Ching Iu

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School of Electrical, Electronic and Computer Engineering, The University of Western Australia, Perth, WA 6009, Australia
Interests: power electronics; chaos, smart grid; renewable energy; nonlinear dynamics
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Dear Colleagues,

Power electronics converters are the most commonly used electronic circuits and can be found in industrial applications. The ever-increasing need for higher efficiency and lower cost make the control, dynamical analysis and design of such converters extremely important, interesting, and even imperative. On the other hand, the requirement for environmentally friendly power generation systems together with the increased cost of fossil fuels and the growing complexity-size of power grids, has led to new and emerging concepts in the generation, transmission and distribution of power. One of the proposed solutions is the idea of a distributed generation that employs renewable energy sources. Microgrids and nanogrids are small-scale energy grids fully based on power electronics converters and can operate either in standalone mode or connected to the main energy grid. This new energy generation paradigm is changing the way electrical grids are conceived. The use of such an idea has dramatically changed the structure of modern power systems where power electronic converters are extensively used. Power converters are either necessary to connect local sources to loads and storage elements or to link several microgrids together or even to the main power grid. We propose a Special Issue that is aimed at providing a multidisciplinary insight into the problems of energy processing through power electronic circuits and their advanced control, dynamical analysis and design in micro and nano grids.

Topics of this Special Issue include but are not limited to:

AC, DC and AC-DC hybrid microgrids;
Microgrids and nanogrids for rural areas;
Transformerless PV inverters and microinverters with MPPT control;
PV string inverter topologies;
DC-DC converters for partial power processing in distributed PV systems;
High step-up voltage ratio DC-DC converters;
MPPT algorithms for PV systems under partial shading conditions;
Module-integrated PV power converter topologies;
Control techniques for PV inverters providing ancillary services;
Power decoupling in single-phase PV inverters;
High conversion ratio power converters for renewable energy applications and electric vehicles;
Stability analysis techniques of switching converters with applications to renewable energy interfaces for nano and micro-grid applications;
Nonlinear dynamic and stability analysis of MPPT controllers;
Stability analysis of grid-connected power generation systems;
Active and reactive power control of energy conversion systems;
Energy conversion systems architectures and technologies for microgrids;
Power electronics integrated with renewables;
Energy conversion systems modelling, remote monitoring and diagnosis.

Prof. Dr. Abdelali El Aroudi
Prof. Dr. Herbert Ho-Ching Iu
Guest Editors

Manuscript Submission Information

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Keywords

microgrids
nanogrids
inverters
MPPT
dynamics
control
renewable energy
power electronics

Published Papers (5 papers)

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Research

11 pages, 2229 KiB

Open AccessArticle

A Family of Y-Impedance-Network Half-Bridge Converters with Additional Voltage Adjustment Function

by Guidong Zhang, Haodong Chen, Lili Qu, Sizhe Chen and Yun Zhang

Energies 2019, 12(18), 3430; https://doi.org/10.3390/en12183430 - 05 Sep 2019

Cited by 1 | Viewed by 2622

Abstract

Half-bridge converters have been widely used in multiple medium power level applications because of the advantages of having less switches and being easy to control. However, their inherent structure leads to low output amplitude and shoot-through problems. In this study, we propose a family of novel half-bridge converters implementing a Y-impedance-network with additional buck-boost voltage adjustment function with the aim of resolving these issues. In order to verify the effectiveness of the proposed topologies, simulations and experiments were conducted, the results which well validate the feasibility of the proposed converters. Full article

(This article belongs to the Special Issue Power Electronics Technologies for Micro and Nano Grids: Dynamics, Analysis, Control and Design)

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17 pages, 5842 KiB

Open AccessArticle

Multi-Input Ćuk-Derived Buck-Boost Voltage Source Inverter for Photovoltaic Systems in Microgrid Applications

by Eltaib Abdeen, Mahmoud A. Gaafar, Mohamed Orabi, Emad M. Ahmed and Abdelali El Aroudi

Energies 2019, 12(10), 2007; https://doi.org/10.3390/en12102007 - 25 May 2019

Cited by 6 | Viewed by 3041

Abstract

This paper presents a multi-input Ćuk-derived Buck-Boost voltage source inverter (CBBVSI) for Photovoltaic (PV) systems. The proposed topology consists of a single-stage DC-AC inverter that combines both DC-DC and DC-AC stages. The DC-DC stage is used for stepping-up the voltage from the PV generator. Simultaneously, the DC-AC stage is used for interfacing the PV source with the AC grid. The topology allows three sources to utilize the antiparallel diodes for each inverter leg for transferring the energy. The proposed system exhibits several features such as a reduction of the number of components compared to typical two-stage structures, and Split-Source Inverter (SSI), and Z-Source Inverter (ZSI) topologies. Moreover, the power of each PV source can be harvested either simultaneously or separately since independent Maximum Power Point Tracking (MPPT) is performed. The system was simulated using MATLAB/SIMULINK software and a 1 kW laboratory prototype was implemented to verify the operation of the proposed CBBVSI. The numerical simulations are presented together with the experimental results, showing a good agreement. Full article

(This article belongs to the Special Issue Power Electronics Technologies for Micro and Nano Grids: Dynamics, Analysis, Control and Design)

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18 pages, 4175 KiB

Open AccessArticle

Seamless Integration of an Autonomous Induction Generator System into an Inverter-Based Microgrid

by Catalin Petrea Ion and Ioan Serban

Energies 2019, 12(4), 638; https://doi.org/10.3390/en12040638 - 16 Feb 2019

Cited by 1 | Viewed by 3132

Abstract

A control strategy for an autonomous induction generator (IG) system synchronization and seamless transfer to an inverter-based microgrid (MG) is presented in the current paper. The IG system control in autonomous mode is performed by a combination between a Voltage Source Inverter (VSI) and a Dump Load (DL). The MG consists of an MG leading inverter having on its DC side a supercapacitor-based energy storage system, two MG supporting inverters, and local loads. The paper presents the IG control part for the VSI-DL system, as well as the synchronisation algorithm that enables the smooth interconnection with the MG. An analysis of the IG impact on an islanded MG is also provided. Experimental validations accomplished on a complex laboratory test-bench have focused on the dynamic events associated with the IG system connection/disconnection to/from the MG and also on the MG response to a load being turned on and off when the IG operates connected to the MG. The obtained results have shown that the proposed synchronization algorithm ensures a seamless transfer for the IG system from autonomous to MG connected mode and vice-versa. Moreover, when a significant load transient occurs within the MG operation, the IG presence does not alter the MG stability. Full article

(This article belongs to the Special Issue Power Electronics Technologies for Micro and Nano Grids: Dynamics, Analysis, Control and Design)

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22 pages, 11820 KiB

Open AccessArticle

Wide Bandwidth Control for Multi-Parallel Grid-Connected Inverters with Harmonic Compensation

by Jingrong Yu, Limin Deng, Dongran Song and Maolin Pei

Energies 2019, 12(3), 571; https://doi.org/10.3390/en12030571 - 12 Feb 2019

Cited by 5 | Viewed by 3116

Abstract

This paper proposes a virtual impedance-based bandwidth control method for multi-parallel harmonic-compensation grid-connected inverters (HCGIs). Firstly, the influence of the resonance points caused by the interaction of multiple HCGIs on the control bandwidth is analyzed, and the analysis result shows that the control bandwidth becomes narrow due to the appearance of a new resonance point. Then, to increase the control bandwidth of multi-parallel HCGIs, six different types of virtual impedance circuits are constructed and compared, and the bandwidth control method based on virtual impedance by capacitor voltage feedback is proposed. Following that, the relationship between feedback coefficient and bandwidth is established, the design approach of parameters for the proposed method is presented. Finally, the proposed method is confirmed by the simulation and experimental tests. The simulation and experimental results show that the proposed control method can effectively shift resonance frequencies right to solve the issue of control bandwidth reduction in multi-parallel HCGIs systems, while without affecting the low-frequency harmonic current compensation. Full article

(This article belongs to the Special Issue Power Electronics Technologies for Micro and Nano Grids: Dynamics, Analysis, Control and Design)

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12 pages, 8973 KiB

Open AccessArticle

Virtual Synchronous Control Based on Control Winding Orientation for Brushless Doubly Fed Induction Generator (BDFIG) Wind Turbines Under Symmetrical Grid Faults

by Min Lu, Yu Chen, Debin Zhang, Jingyuan Su and Yong Kang

Energies 2019, 12(2), 319; https://doi.org/10.3390/en12020319 - 20 Jan 2019

Cited by 13 | Viewed by 3337

Abstract

The Brushless Doubly Fed Induction Generator (BDFIG) has huge potential for wind power systems due to its high reliability and low maintenance cost. To add inertia for system stability enhancement, as well as to maintain the uninterrupted operation during symmetrical grid faults, this study proposes a Virtual Synchronous Control (VSC) with a transient current compensation strategy for BDFIG. The proposed VSC is realized by regulating the virtual inner electrical potential and angular velocity of BDFIG under Control Winding (CW) current oriented vector control, and compensating for the transient CW current to weaken the transient inner electrical potential under symmetrical grid faults. Modeling and analysis of such a VSC strategy are presented in this paper, and a simulation is also made to compare the performances of existing and proposed VSC strategies. It is shown that the merits of the proposed VSC can enhance the fault ride through the ability of the BDFIG system and support the recovery of grid voltage. Full article

(This article belongs to the Special Issue Power Electronics Technologies for Micro and Nano Grids: Dynamics, Analysis, Control and Design)

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