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Energies
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Emerging Converters, Advanced Control and Technologies Enhancing Electric Energy Conversion...
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Emerging Converters, Advanced Control and Technologies Enhancing Electric Energy Conversion in Photovoltaic Systems

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A2: Solar Energy and Photovoltaic Systems".

Deadline for manuscript submissions: closed (10 September 2021) | Viewed by 11657

Special Issue Editor

Dr. Andrii Chub

E-Mail Website
Guest Editor
Department of Electrical Power Engineering and Mechatronics, Tallinn University of Technology, 19086 Tallinn, Estonia
Interests: power electronics; DC-DC converters; DC microgrids; fault tolerance; reliability
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Sustainable development is the only way for humanity to survive exhaustion of fossil fuels and overcome environmental challenges piled up during industrial age. Significant cost and efficiency improvements of PV systems made them commercially attractive solution. Therefore, mass deployment of photovoltaic systems is advancing at an accelerating pace. Large photovoltaic plants are considered as the best replacement for central generation facilities burning fossils. Each year new records are achieved in the top of the largest PV power plants. Moreover, building integrated photovoltaic as well as powering IoT devices and micro satellites show trend towards low-power high-performance systems. Hence, the PV technology is advancing fast at all power levels and penetrate increasing number of applications.

Even though the PV industry achieved high maturity level, there are numerous challenges and opportunities open for new solutions. Among them, stability of parallel PV generation units, reliability driven design of converters, shade-tolerant residential power interfaces, and active power control methods are of special interest among others. This special session aims to concentrate the latest developments and allow researchers to share experiences to advance power electronic converters, control methods and design methods for photovoltaic systems.

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

  • Transformerless PV inverters with wide input voltage range
  • Active power decoupling in single-phase PV inverters
  • High step-up dc-dc converters
  • Partial power processing converters for distributed PV architectures
  • PV power optimizers and their control
  • PV microinverters with an improved MPPT range
  • Sub-module PV power converter topologies
  • Topologies for increased reliability and warranty extension
  • Efficiency and reliability of PV systems
  • Global MPPT algorithms for PV systems under partial shading conditions
  • Advanced control for PV inverters to provide ancillary grid services
  • Active power control strategies: delta power control, ramp-rate control, etc.
  • Module-level PV system monitoring and diagnosis
  • Stability of parallel power converters in large PV plants
  • Resiliency of islanded PV systems
  • Design and control of battery energy storage system coordinated with PV generators
  • Artificial intelligence methods applied in design and control of PV systems
  • Solutions for repowering and retrofitting aging PV power plants

Dr. Andrii Chub
Guest Editor

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. Energies 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 2600 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

  • PV systems
  • Power electronics
  • PV inverters
  • PV module level power electronics
  • power control
  • dc-dc converters
  • converter topologies
  • energy efficiency
  • system reliability

Published Papers (4 papers)

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Research

20 pages, 6756 KiB  
Article
Wide Range Series Resonant DC-DC Converter with a Reduced Component Count and Capacitor Voltage Stress for Distributed Generation
by Abualkasim Bakeer, Andrii Chub, Andrei Blinov and Jih-Sheng Lai
Energies 2021, 14(8), 2051; https://doi.org/10.3390/en14082051 - 07 Apr 2021
Cited by 2 | Viewed by 1842
Abstract
This paper proposes a galvanically isolated dc-dc converter that can regulate the input voltage in a wide range. It is based on the series resonance dc-dc converter (SRC) topology and a novel boost rectifier. The proposed topology has a smaller number of semiconductors [...] Read more.
This paper proposes a galvanically isolated dc-dc converter that can regulate the input voltage in a wide range. It is based on the series resonance dc-dc converter (SRC) topology and a novel boost rectifier. The proposed topology has a smaller number of semiconductors than its SRC-based existing topologies employing an ac-switch in the boost rectifier. The proposed dc-dc converter comprises only two diodes and one switch at the output side, while the existing solutions use two switches and two diodes to step up the voltage. The proposed converter boosts the input voltage within a single boosting interval in the positive half-cycle of the switching period. In addition, the resonant current in the negative half-cycle is sinusoidal, which could enhance the converter efficiency. The resonant capacitor voltage is clamped at the level of the output voltage. Therefore, the voltage stress of the capacitor could significantly reduce at various input voltage and power levels. This makes it perfect for distributed generation applications such as photovoltaics with wide variations of input voltage and power. The converter operates at the fixed switching frequency close to the resonance frequency to obtain the maximum efficiency at the nominal input voltage. The zero-voltage switching (ZVS) feature is achieved in the primary semiconductors, while the diodes in the output-side rectifier turn off at nearly zero current switching. The mathematical model and design guidelines of the proposed converter are discussed in the paper. The experimental results confirmed the theoretical analysis based on a 300 W prototype. The maximum efficiency of the converter was 96.8% at the nominal input voltage, and the converter has achieved a wider input voltage regulation range than that with the boosting cell comprising an ac-switch. Full article
(This article belongs to the Special Issue Emerging Converters, Advanced Control and Technologies Enhancing Electric Energy Conversion in Photovoltaic Systems)
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15 pages, 5962 KiB  
Article
Evaluation and Analysis of Selective Deployment of Power Optimizers for Residential PV Systems
by Kostas Sinapis, Konstantinos Tsatsakis, Maarten Dörenkämper and Wilfried G. J. H. M. van Sark
Energies 2021, 14(4), 811; https://doi.org/10.3390/en14040811 - 04 Feb 2021
Cited by 6 | Viewed by 4088
Abstract
Partial shading is widely considered to be a limiting factor in the performance of photovoltaic (PV) systems applied in urban environments. Modern system architectures, combined with per module deployment of power electronics, have been used to improve performance, especially at heterogeneous irradiance conditions, [...] Read more.
Partial shading is widely considered to be a limiting factor in the performance of photovoltaic (PV) systems applied in urban environments. Modern system architectures, combined with per module deployment of power electronics, have been used to improve performance, especially at heterogeneous irradiance conditions, but they come with a high investment cost. In this paper, another approach is used to evaluate the selective deployment of power optimizers (SDPO), which can operate with a variety of string inverters and can be retrofitted in PV systems suffering from high shading losses. A combination of modelling and outdoor field testing showed the benefits and drawbacks of SDPOs in a variety of shading scenarios. Results suggest that there is an energy yield increase of 1–2% on an annual basis compared to that of a reference system. The exact level of increase depends on the shading patterns and combination scenarios used in this paper. Full article
(This article belongs to the Special Issue Emerging Converters, Advanced Control and Technologies Enhancing Electric Energy Conversion in Photovoltaic Systems)
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16 pages, 1230 KiB  
Article
Modified Impedance-Source Inverter with Continuous Input Currents and Fault-Tolerant Operations
by Jing Yuan, Yongheng Yang, Ping Liu, Yanfeng Shen and Frede Blaabjerg
Energies 2020, 13(13), 3408; https://doi.org/10.3390/en13133408 - 02 Jul 2020
Cited by 1 | Viewed by 1740
Abstract
Impedance-source (Z-source) inverters are increasingly adopted in practice, where a high voltage gain is required. However, issues like drawing a non-continuous current from the DC source and ceasing the energy supply under DC source faults are also observed. In this paper, an embedded [...] Read more.
Impedance-source (Z-source) inverters are increasingly adopted in practice, where a high voltage gain is required. However, issues like drawing a non-continuous current from the DC source and ceasing the energy supply under DC source faults are also observed. In this paper, an embedded enhanced-boost Z-source inverter (EEB-ZSI) is thus proposed to tackle the issues. The proposed EEB-ZSI employs two DC sources, which enable the continuous input current and fault-tolerant operations (e.g., open-circuit and short-circuit faults in the DC sources). The operational principles are presented in detail with an in-depth circuit analysis. Moreover, the proposed EEB-ZSI is benchmarked with prior-art Z-source inverters. Experimental tests further demonstrate the effectiveness of EEB-ZSI regarding the continuous input current and flexible fault tolerance. Full article
(This article belongs to the Special Issue Emerging Converters, Advanced Control and Technologies Enhancing Electric Energy Conversion in Photovoltaic Systems)
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19 pages, 10298 KiB  
Article
On the Equivalence of the Switched Inductor and the Tapped Inductor Converters and its Application to Small Signal Modelling
by Jia Yao, Kewei Li, Kaisheng Zheng and Alexander Abramovitz
Energies 2019, 12(24), 4806; https://doi.org/10.3390/en12244806 - 17 Dec 2019
Cited by 1 | Viewed by 3101
Abstract
Switched inductor (SI) converters are popular in applications requiring a steeper conversion ratio. However, these converters operate a twin inductor switching cell, which complicates the small-signal modeling. This paper proposes an expeditious small-signal analysis method to model the SI converters. The offered modeling [...] Read more.
Switched inductor (SI) converters are popular in applications requiring a steeper conversion ratio. However, these converters operate a twin inductor switching cell, which complicates the small-signal modeling. This paper proposes an expeditious small-signal analysis method to model the SI converters. The offered modeling approach is hinged on the analogy existing between the SI converters and certain Tapped Inductor (TI) converters. It is suggested here that by virtue of the analogy of the SI converters and TI converters the small-signal model of the SI converter is identical to that of its ideal TI counterpart. Hence, the recently developed Tapped Inductor Switcher (TIS) methodology can be applied to the modeling of the SI converters as well. As an example, the small-signal model of the Switched Inductor Buck converter is obtained. Theoretical analysis was confirmed by simulation and experimental results. In addition, several other SI converters and their TI counterparts are identified. Full article
(This article belongs to the Special Issue Emerging Converters, Advanced Control and Technologies Enhancing Electric Energy Conversion in Photovoltaic Systems)
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