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Electronics
Special Issues
Grid-Connected PV Systems
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Grid-Connected PV Systems

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Power Electronics".

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 11567

Special Issue Editors

Prof. Dr. Huafeng Xiao

E-Mail Website
Guest Editor
School of Electrical Engineering, Southeast University, Nanjing 210096, China
Interests: topologies, controllers, and protection methodology for grid-connected renewable energy; multiple HVDC; application of Wide-Bandgap (WBG) devices
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Frede Blaabjerg

grade E-Mail Website
Guest Editor
Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark
Interests: power electronics and its applications in motor drives; wind turbines; PV systems; harmonics; reliability of power electronic systems
Special Issues, Collections and Topics in MDPI journals
Dr. Chushan Li

E-Mail Website
Guest Editor
Zhejiang University - University of Illinois at Urbana-Champaign Institute, Zhejiang University, Haining 310058, China
Interests: high power density converter design; medium voltage high power conversion; application of Wide-Band-Gap (WBG) devices

Special Issue Information

Dear Colleagues,

Renewable energy, such as photovoltaic (PV) and wind turbine, will play the most important role in future power systems. Today, grid-connected PV systems are the mainstream application style for PV generation, featuring high conversion efficiency, low cost, easy installation, etc., such as in the transformerless PV system structure. In order to further increase the proportion of PV power in the power system, higher-performance grid-connected PV systems with high safety, low volume, high power density, and high grid support ability are necessary. 

The main aim of this Special Issue is to publish high-quality submissions that highlight technical trends of grid-connected PV systems and address recent breakthroughs in the modeling, safety, reliability, high power density, smart control, and power shifting for grid-connected PV systems. The topics of interest include but are not limited to:·      

  • Modeling and analysis methods of grid-connected PV systems;
  • Safety issue of grid-connected PV systems;
  • Topologies for grid-connected PV systems;
  • Control strategies for grid-connected PV systems;
  • Wide-bandgap (WBG) devices applications in grid-connected PV systems;
  • High-frequency and high-power density of grid-connected PV systems;
  • Energy storage strategies for grid-connected PV systems;
  • Standard aspects of grid-connected PV systems

Prof. Dr. Huafeng Xiao
Prof. Dr. Frede Blaabjerg
Dr. Chushan Li
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. Electronics 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.

Published Papers (4 papers)

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Research

20 pages, 6110 KiB  
Article
Improved Active Disturbance Rejection Control Strategy for LCL-Type Grid-Connected Inverters Based on the Backstepping Method
by Zhiru Zhang and Wenfang Ding
Electronics 2022, 11(14), 2237; https://doi.org/10.3390/electronics11142237 - 17 Jul 2022
Cited by 4 | Viewed by 1531
Abstract
In the process of grid connection of an LCL inverter, sudden changes in load, high harmonics of the grid voltage, sudden changes in power, and other disturbances often occur. These will cause sharp degradation of the grid-connected power quality, so this paper proposes [...] Read more.
In the process of grid connection of an LCL inverter, sudden changes in load, high harmonics of the grid voltage, sudden changes in power, and other disturbances often occur. These will cause sharp degradation of the grid-connected power quality, so this paper proposes a new solution to the problem of how to reduce and eliminate disturbances in power quality by using a first-order linear active disturbance rejection control (LADRC) strategy with precise compensation via splitting the total disturbance term. An improved overall direct compensation method for total disturbance was proposed. The use of a subdivision compensation term could avoid the misjudgment arising from the estimation of the overall perturbation by the linear expanded state observer (LESO) within the first few weeks of the feedback when the overall compensation was applied. It aimed to reduce the overshooting caused by the overcompensation of the estimated disturbance term and to shorten the system convergence speed. Backstepping control was introduced to optimize the intermediate quantities of LADRC to estimate the error design outer-loop control law. The controlled quantity tracking the input quantity had excellent characteristics, and could set the desired error range quantity as the purpose of approximation. Therefore, backstepping control was suitable as a feedforward control of the system to preprocess the error in the estimated total disturbance of LESO and feed it into the inner loop improvement LADRC. Secondly, an improved control cascade PWM modulation with a PLL phase-locked loop to regulate the inverter output resulted in the elimination of the effects of internal and external disturbances on the grid-connected current and voltage. Finally, the amplitude–frequency characteristics were analyzed and compared for the trackability and antidisturbance of the improved linear active disturbance rejection controller, showing a good performance of the improved active disturbance rejection. At the same time, comparative simulations were conducted to confirm that the grid-connected current of the LCL inverter could obtain a better stability and grid entry quality in the first-order improved linear active disturbance rejection control. Full article
(This article belongs to the Special Issue Grid-Connected PV Systems)
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21 pages, 1406 KiB  
Article
National Quality Infrastructure System and Its Application Progress in Photovoltaic Industry
by Rui Sun, Hua-Feng Xiao, Chen-Hui Niu, Qing-Wei Cao and Zhong-Yuan Yao
Electronics 2022, 11(3), 426; https://doi.org/10.3390/electronics11030426 - 30 Jan 2022
Cited by 1 | Viewed by 4265
Abstract
With the rapid development of economic construction, National Quality Infrastructure (NQI) has received increasing attention from countries and international organizations. NQI is a comprehensive system and capacity building, which plays a key role in promoting healthy and sustainable economic and social development. However, [...] Read more.
With the rapid development of economic construction, National Quality Infrastructure (NQI) has received increasing attention from countries and international organizations. NQI is a comprehensive system and capacity building, which plays a key role in promoting healthy and sustainable economic and social development. However, the photovoltaic industry has not yet established an NQI system and lacks an overall quality supervision mechanism. This will hinder the comprehensive development of the photovoltaic industry in terms of standards, metrology, conformity assessment, etc. In this paper, first, the concept and overall framework NQI is sorted out; the three most important elements of NQI are pointed out. Then, on the basis of fully explaining the NQI, an NQI system for the photovoltaic industry is established for the first time, and the construction of the NQI elements of the photovoltaic industry internationally is sorted out in detail. Finally, the possible solutions to the problems existing in the overall construction of the NQI system are proposed. Points for improvement are listed for each element of the NQI system for the photovoltaic industry. Full article
(This article belongs to the Special Issue Grid-Connected PV Systems)
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23 pages, 12670 KiB  
Article
Direct Sliding Mode Control for Dynamic Instabilities in DC-Link Voltage of Standalone Photovoltaic Systems with a Small Capacitor
by Ibrahim Al-Wesabi, Zhijian Fang, Zhiguo Wei and Hanlin Dong
Electronics 2022, 11(1), 133; https://doi.org/10.3390/electronics11010133 - 01 Jan 2022
Cited by 15 | Viewed by 1820
Abstract
Large electrolytic capacitors used in grid-connected and stand-alone photovoltaic (PV) applications for power decoupling purposes are unreliable because of their short lifetime. Film capacitors can be used instead of electrolytic capacitors if the energy storage requirement of the power conditioning units (PCUs) is [...] Read more.
Large electrolytic capacitors used in grid-connected and stand-alone photovoltaic (PV) applications for power decoupling purposes are unreliable because of their short lifetime. Film capacitors can be used instead of electrolytic capacitors if the energy storage requirement of the power conditioning units (PCUs) is reduced, since they offer better reliability and have a longer lifetime. Film capacitors have a lower capacitance than electrolytic capacitors, causing enormous frequency ripples on the DC-link voltage and affecting the standalone photovoltaic system’s dynamic performance. This research provided novel direct sliding mode controllers (DSMCs) for minimizing DC-link capacitor, regulating various components of the PV/BES system that assists to manage the DC-link voltage with a small capacitor. DSMCs were combined with the perturb and observe (P&O) method for DC boost converters to increase the photovoltaic system’s dynamic performance, and regulate the battery’s bidirectional converter (BDC) to overcome the DC-link voltage instabilities caused via a lower DC-link capacitor. The system is intended to power both AC and DC loads in places without grid connection. The system’s functions are divided into four modes, dependent on energy supply and demand, and the battery’s state of charge. The findings illustrate the controllers’ durability and the system’s outstanding performance. The testing was carried out on the MT real-time control platform NI PXIE-1071 utilizing Hardware-In-The-Loop experiments and MATLAB/Simulink. Full article
(This article belongs to the Special Issue Grid-Connected PV Systems)
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28 pages, 11227 KiB  
Article
Photovoltaic Power Plant Collection and Connection to HVDC Grid with High Voltage DC/DC Converter
by Xinke Huang, Huan Wang, Yu Zhou, Xinlei Zhang, Yibo Wang and Honghua Xu
Electronics 2021, 10(24), 3098; https://doi.org/10.3390/electronics10243098 - 13 Dec 2021
Cited by 3 | Viewed by 2630
Abstract
Photovoltaic (PV) power plant collection and connection to a high voltage direct current (HVDC) grid has many advantages. Compared with the traditional AC collection and grid-connection scheme, it can reduce the power conversion links and improve the system efficiency. As one of the [...] Read more.
Photovoltaic (PV) power plant collection and connection to a high voltage direct current (HVDC) grid has many advantages. Compared with the traditional AC collection and grid-connection scheme, it can reduce the power conversion links and improve the system efficiency. As one of the most important devices in the application of a PV HVDC collection and grid-connection system, a high voltage, large capacity, high step-up ratio DC/DC converter is the critical technology. A DC/DC converter scheme based on a boost full bridge isolated power module cascaded in input parallel output series (IPOS) structure is proposed to meet the technical requirements of PV power conversion with high voltage, large capacity, and high step-up ratio. The operation mode of the power module is analyzed, the soft switching method is proposed, and the constraint to realize the soft switching of the power module is deduced. Aiming to resolve the problem of multi-module voltage and current equalization in a cascaded DC/DC converter, a distributed module equalization control strategy is proposed to realize the reliable operation of a power module and converter. A 5 kV/80 kW standard power module is developed, the DC/DC converter experimental platform is built, and the proposed system scheme and control strategy are verified by experiments. Based on a 14-power module input parallel output series connection, a ±30 kV/1 MW PV DC/DC converter is developed, a ±30 kV PV HVDC collection and grid-connection demonstration system is established, and the experimental test is completed to realize the stable operation of the system. Full article
(This article belongs to the Special Issue Grid-Connected PV Systems)
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