Special Issue "Power Converters in Power Electronics"

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

Deadline for manuscript submissions: 31 December 2019

Special Issue Editor

Guest Editor
Dr. Minh-Khai Nguyen

School of Electrical Engineering and Computer Science, Queensland University of Technology, Brisbane QLD 4001, Australia
Website | E-Mail
Interests: power electronics, impedance-source converters, multilevel inverters, PWM strategies

Special Issue Information

Dear Colleagues,

In recent years, power converters have played an important role in power electronics technology for different applications such as renewable energy system, electric vehicle, pulsed power generation, and biomedical. Power converters in power electronics are becoming essential for generating electrical power energy in various ways. This Special Issue focuses on the development of novel power converter topologies in power electronics.

Topics of interest include but are not limited to the following:

  • Z-source converters;
  • Multilevel power converter topologies;
  • Switched-capacitor-based power converters;
  • Power converters for pulsed power generation;
  • Power converters in wireless power transfer techniques;
  • The reliability of power conversion systems;
  • Modulation techniques for advanced power converters.

Technical Program Committee Members:

1. Prof. Xiaoqiang Guo IEEE Senior Member,  Department of Electrical Engineering, Yanshan University, Qinhuangdao, 066004, China

Dr. Minh-Khai Nguyen
Guest Editor

Manuscript Submission Information

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Keywords

  • Multilevel power converters
  • Z-source inverters
  • Power converter control
  • PWM techniques for power converters
  • Fault tolerant power converters
  • Power converters for pulsed power applications
  • Power converters in wireless power transfer techniques

Published Papers (10 papers)

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Research

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Open AccessArticle
Shaping SiC MOSFET Voltage and Current Transitions by Intelligent Control for Reduced EMI Generation
Electronics 2019, 8(5), 508; https://doi.org/10.3390/electronics8050508
Received: 11 April 2019 / Revised: 27 April 2019 / Accepted: 2 May 2019 / Published: 8 May 2019
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Abstract
In power converters, the fast switching of the power conversion components results in rapid changes in voltage and current, which results in oscillations and high-level electromagnetic interference (EMI), so the power components become a source of internal electromagnetic interference. Taking SiC Metal-Oxide-Semiconductor Field-Effect [...] Read more.
In power converters, the fast switching of the power conversion components results in rapid changes in voltage and current, which results in oscillations and high-level electromagnetic interference (EMI), so the power components become a source of internal electromagnetic interference. Taking SiC Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) as an example, an intelligent control method to suppressing interference sources is proposed in this paper. The combination of open-loop and closed-loop methods can simultaneously reduce the electromagnetic interference generated by voltage and current. Firstly, this paper analyzes how to select a reference signal. The relationship between the time domain and the frequency domain of the noise signal is analyzed. The convolution of the trapezoidal signal and the Gaussian signal is selected as the reference signal, which is named S-shaped signal in this paper. The S-shaped signal has continuous infinitely conductive characteristics, so its spectrum has a large attenuation in the high frequency region. Secondly, a new topology is proposed. Based on the closed-loop gate control, a current control signal is added, which can simultaneously shape the output voltage and control the output current slope. Both the simulation results and the experimental results show that the output voltage can follow the reference signal, S-shaped signal, and the slope and overshoot of output current can be changed. Compared with classical gate driver method, the spectrum of output voltage and output current obtained by the method proposed in this paper has a large attenuation, in other words, the electromagnetic interference is significantly reduced. Full article
(This article belongs to the Special Issue Power Converters in Power Electronics)
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Open AccessFeature PaperArticle
Modulation Strategy with a Minimal Number of Commutations for a Five-Level H-Bridge NPC Inverter
Electronics 2019, 8(4), 454; https://doi.org/10.3390/electronics8040454
Received: 13 February 2019 / Revised: 17 April 2019 / Accepted: 18 April 2019 / Published: 23 April 2019
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Abstract
In this paper, a so-called OPTimized Pulse Width Modulation (OPT-PWM) strategy with a minimal number of commutations for a multilevel converter (MC) is proposed. The principle is based on the reduction of the number of switch commutations by removing the unnecessary ones for [...] Read more.
In this paper, a so-called OPTimized Pulse Width Modulation (OPT-PWM) strategy with a minimal number of commutations for a multilevel converter (MC) is proposed. The principle is based on the reduction of the number of switch commutations by removing the unnecessary ones for each voltage level transition. The OPT-PWM strategy is applied to a five-level H-Bridge Neutral Point Clamped (HB-5L-NPC) inverter. A specific block based on a state machine is added to conventional modulation techniques to perform the transitions from a given voltage level to another one via the best trajectory with a minimal number of commutations. The principle of this additional block can be applied to any modulation technique. In this paper, the proposed strategy is validated first by simulation and then through experimental tests. Full article
(This article belongs to the Special Issue Power Converters in Power Electronics)
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Open AccessArticle
Analysis of a DC Converter with Low Primary Current Loss and Balance Voltage and Current
Electronics 2019, 8(4), 439; https://doi.org/10.3390/electronics8040439
Received: 6 April 2019 / Revised: 12 April 2019 / Accepted: 15 April 2019 / Published: 17 April 2019
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Abstract
A dc/dc pulse width modulation (PWM) circuit was investigated to realize the functions of reduced primary current loss and balanced voltage and current distribution. In the presented dc/dc converter, two full bridge pulse width modulation circuits were used with the series/parallel connection on [...] Read more.
A dc/dc pulse width modulation (PWM) circuit was investigated to realize the functions of reduced primary current loss and balanced voltage and current distribution. In the presented dc/dc converter, two full bridge pulse width modulation circuits were used with the series/parallel connection on the high-voltage/low-voltage side. The flying capacitor was adopted on the input side to achieve voltage balance on input split capacitors. The magnetic coupling element was employed to achieve current sharing between two parallel circuits. A capacitor-diode passive circuit was adopted to lessen the primary current at the commutated interval. The phase-shifted duty cycle control approach was employed to regulate load voltage and implement soft switching characteristics of power metal-oxide-semiconductor field-effect transistors (MOSFETs). Finally, the experimental results using a 1.68 kW prototype converter were obtained to confirm the performance and feasibility of the studied circuit topology. Full article
(This article belongs to the Special Issue Power Converters in Power Electronics)
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Open AccessArticle
Enhancement of System Stability Based on PWFM
Electronics 2019, 8(4), 399; https://doi.org/10.3390/electronics8040399
Received: 9 March 2019 / Revised: 26 March 2019 / Accepted: 27 March 2019 / Published: 3 April 2019
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Abstract
In this paper, a pulse width and frequency modulation (PWFM) control strategy is presented, which combines the one-comparator counter-based pulse width modulation (PWM) control with pulse frequency modulation (PFM) control to increase pseudo-1-bit resolution under constant-frequency operation. Accordingly, system stability will be enhanced [...] Read more.
In this paper, a pulse width and frequency modulation (PWFM) control strategy is presented, which combines the one-comparator counter-based pulse width modulation (PWM) control with pulse frequency modulation (PFM) control to increase pseudo-1-bit resolution under constant-frequency operation. Accordingly, system stability will be enhanced significantly. As compared with the traditional counter-based PWM control, there is no difference in off-chip circuit complexity except a slight change in on-chip hardware. Finally, a prototype circuit is used to verify the proposed control concept by some experimental results with no limit cycle oscillation. Full article
(This article belongs to the Special Issue Power Converters in Power Electronics)
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Open AccessArticle
Transformerless Quasi-Z-Source Inverter to Reduce Leakage Current for Single-Phase Grid-Tied Applications
Electronics 2019, 8(3), 312; https://doi.org/10.3390/electronics8030312
Received: 13 February 2019 / Revised: 2 March 2019 / Accepted: 4 March 2019 / Published: 12 March 2019
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Abstract
The conventional single-phase quasi-Z-source (QZS) inverter has a high leakage current as it is connected to the grid. To address this problem, this paper proposes a transformerless QZS inverter, which can reduce the leakage current for single-phase grid-tied applications. The proposed inverter effectively [...] Read more.
The conventional single-phase quasi-Z-source (QZS) inverter has a high leakage current as it is connected to the grid. To address this problem, this paper proposes a transformerless QZS inverter, which can reduce the leakage current for single-phase grid-tied applications. The proposed inverter effectively alleviates the leakage current problem by removing high-frequency components for the common-mode voltage. The operation principle of the proposed inverter is described together with its control strategy. A control scheme is presented for regulating the DC-link voltage and the grid current. A 1.0 kW prototype inverter was designed and tested to verify the performance of the proposed inverter. Silicon carbide (SiC) power devices were applied to the proposed inverter to increase the power efficiency. The experimental results showed that the proposed inverter achieved high performance for leakage current reduction and power efficiency improvement. Full article
(This article belongs to the Special Issue Power Converters in Power Electronics)
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Open AccessArticle
Three-Phase Five-Level Cascade Quasi-Switched Boost Inverter
Electronics 2019, 8(3), 296; https://doi.org/10.3390/electronics8030296
Received: 30 January 2019 / Revised: 24 February 2019 / Accepted: 1 March 2019 / Published: 6 March 2019
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Abstract
This paper presents a three-phase cascaded five-level H-bridge quasi-switched boost inverter (CHB-qSBI). The merits of the CHB-qSBI are as follows: single-stage conversion, shoot-through immunity, buck-boost voltage, and reduced passive components. Furthermore, a PWM control method is applied to the CHB-qSBI topology to improve [...] Read more.
This paper presents a three-phase cascaded five-level H-bridge quasi-switched boost inverter (CHB-qSBI). The merits of the CHB-qSBI are as follows: single-stage conversion, shoot-through immunity, buck-boost voltage, and reduced passive components. Furthermore, a PWM control method is applied to the CHB-qSBI topology to improve the modulation index. The voltage stress across power semiconductor devices and the capacitor are significantly lower using improved pulse-width modulation (PWM) control. Additionally, by controlling individual shoot-through duty cycle, the DC-link voltage of each module can achieve the same values. As a result, the imbalance problem of the DC-link voltage can be solved. A detailed analysis and operating principle with the modulation scheme and comprehensive comparison for the CHB-qSBI are illustrated. The experimental and simulation results are presented to validate the operating principle of the three-phase CHB-qSBI. Full article
(This article belongs to the Special Issue Power Converters in Power Electronics)
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Open AccessArticle
A Novel Three-Switch Z-Source SEPIC Inverter
Electronics 2019, 8(2), 247; https://doi.org/10.3390/electronics8020247
Received: 14 January 2019 / Revised: 19 February 2019 / Accepted: 19 February 2019 / Published: 21 February 2019
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Abstract
In this paper, a novel single-phase transformerless Z-source inverter (ZSI) derived from the basic SEPIC topology, which is named SEPIC-based ZSI, is proposed. The negative end of the input DC voltage of this topology is directly connected to the load and grounded, which [...] Read more.
In this paper, a novel single-phase transformerless Z-source inverter (ZSI) derived from the basic SEPIC topology, which is named SEPIC-based ZSI, is proposed. The negative end of the input DC voltage of this topology is directly connected to the load and grounded, which can completely eliminate leakage current. Furthermore, this topology has some attractive characteristics such as buck–boost capability, impressive voltage gain, linear voltage gain is realized by a simple control method, and so on. The theoretical design and simulation results are demonstrated by corresponding experiments carried out on a 500 W laboratory prototype controlled by using a DSP TMS320F28335 controller combined with a FPGA SPARTAN-6. Full article
(This article belongs to the Special Issue Power Converters in Power Electronics)
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Open AccessArticle
Voltage Multiplier Cell-Based Quasi-Switched Boost Inverter with Low Input Current Ripple
Electronics 2019, 8(2), 227; https://doi.org/10.3390/electronics8020227
Received: 21 January 2019 / Revised: 14 February 2019 / Accepted: 15 February 2019 / Published: 18 February 2019
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Abstract
A novel single-phase single-stage voltage multiplier cell-based quasi-switched boost inverter (VMC-qSBI) is proposed in this paper. By adding the voltage multiplier cell to the qSBI, the proposed VMC-qSBI has the following merits; a decreased voltage stress on an additional switch, a high voltage [...] Read more.
A novel single-phase single-stage voltage multiplier cell-based quasi-switched boost inverter (VMC-qSBI) is proposed in this paper. By adding the voltage multiplier cell to the qSBI, the proposed VMC-qSBI has the following merits; a decreased voltage stress on an additional switch, a high voltage gain, a continuous input current, shoot through immunity, and a high modulation index. A new pulse-width modulation (PWM) control strategy is presented for the proposed inverter to reduce the input current ripple. To improve the voltage gain of the proposed inverter, an extension is addressed by adding the VMCs. The operating principle, steady-state analysis, and impedance parameter design guideline of the proposed inverter are presented. A comparison between the proposed inverter and other impedance source-based high-voltage gain inverters is shown. Simulation and experimental results are provided to confirm the theoretical analysis. Full article
(This article belongs to the Special Issue Power Converters in Power Electronics)
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Open AccessArticle
A Modified Model Predictive Power Control for Grid-Connected T-Type Inverter with Reduced Computational Complexity
Electronics 2019, 8(2), 217; https://doi.org/10.3390/electronics8020217
Received: 16 January 2019 / Revised: 6 February 2019 / Accepted: 13 February 2019 / Published: 15 February 2019
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Abstract
This study proposed a modified power strategy based on model predictive control for a grid-connected three-level T-type inverter. The controller utilizes the mathematical model to forecast the performance of the grid current, the balance of DC-bus capacitor voltages and switching frequency. The proposed [...] Read more.
This study proposed a modified power strategy based on model predictive control for a grid-connected three-level T-type inverter. The controller utilizes the mathematical model to forecast the performance of the grid current, the balance of DC-bus capacitor voltages and switching frequency. The proposed method outlines a new technique to formulate a control objective. The control objective includes the absolute error of the inverter voltage reference and its possible values instead of the grid current error. By using the modified equivalent transformations in the cost function, the execution time was reduced 22% compared to the traditional model predictive control while maintaining the high dynamic performances of the power and low total harmonic distortion of the current. A comparative investigation showed that the proposed method obtains a high-performance control compared with the classical power control scheme with linear PI controllers and space vector modulation. The feasibility of the proposed method was verified by the simulation and experimental results. Full article
(This article belongs to the Special Issue Power Converters in Power Electronics)
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Review

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Open AccessReview
Active Power Decoupling for Current Source Converters: An Overview Scenario
Electronics 2019, 8(2), 197; https://doi.org/10.3390/electronics8020197
Received: 29 December 2018 / Revised: 1 February 2019 / Accepted: 2 February 2019 / Published: 8 February 2019
Cited by 2 | PDF Full-text (5119 KB) | HTML Full-text | XML Full-text
Abstract
For single-phase current source converters, there is an inherent limitation in DC-side low-frequency power oscillation, which is twice the grid fundamental frequency. In practice, it transfers to the DC side and results in the low-frequency DC-link ripple. One possible solution is to install [...] Read more.
For single-phase current source converters, there is an inherent limitation in DC-side low-frequency power oscillation, which is twice the grid fundamental frequency. In practice, it transfers to the DC side and results in the low-frequency DC-link ripple. One possible solution is to install excessively large DC-link inductance for attenuating the ripple. However, it is of bulky size and not cost-effective. Another method is to use the passive LC branch for bypassing the power decoupling, but this is still not cost-effective due to the low-frequency LC circuit. Recently, active power decoupling techniques for the current source converters have been sparsely reported in literature. However, there has been no attempt to classify and understand them in a systematic way so far. In order to fill this gap, an overview of the active power decoupling for single-phase current source converters is presented in this paper. Systematic classification and comparison are provided for researchers and engineers to select the appropriate solutions for their specific applications. Full article
(This article belongs to the Special Issue Power Converters in Power Electronics)
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