Submit to Energies Review for Energies Propose a Special Issue

Journal Browser

► Journal Browser

Advanced Technologies in Power Quality and Solutions

Print Special Issue Flyer
Special Issue Editors
Special Issue Information
Keywords
Related Special Issue
Published Papers

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F3: Power Electronics".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 16658

Share This Special Issue

Special Issue Editor

Prof. Dr. Dayi Li

E-Mail Website
Guest Editor

School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: power quality; electrical motors and controls; modeling and simulation of power systems
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The Guest Editor is inviting submissions to a Special Issue of Energies on the subject area of “Advanced Technologies in Power Quality and Solutions”. In recent years, there has been a growing use of power electronics in various fields such as adjustable speed drives (ASDs), high-voltage direct-current (HVDC) systems, renewable distributed generation, electric vehicle chargers, furnace, industrial manufactures, domestic appliances, etc., which are nonlinear and impact loads, possibly resulting in not only power quality problems (e.g., harmonic distortion, poor power factor and three-phase unbalance), but also excessive neutral currents, lower system efficiency, disturbance to other consumers and interference in nearby communication. As a dynamic and adjustable solution to these power quality problems, power quality controllers have attracted the attention of many researchers. Power quality controllers can eliminate harmonics, compensate reactive power, correct power factor, and solve the problems of voltage sag, swell and three-phase unbalance. Prospective authors are invited to submit original unpublished manuscripts addressing power quality.

This Special Issue will deal with advanced technologies in power quality. Topics of interest for publication include, but are not limited to:

Power Quality Analysis
Power Quality Mitigation Technologies
Power Quality Monitoring
Power Quality Standards
Equipment Power Quality Immunity
Power Quality and Reliability
Power Quality Data Analytics
Distributed Generation and Power Quality
Detection Technology of Power Quality;
Topology Structure of Power Quality Controllers;
Control Method of Power Quality Controllers;
Compensation Strategy of Power Quality Controllers;
Power Quality Problems in Power-Electronics-Based Power Systems;

Prof. Dr. Dayi Li
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

power electronics
power systems
active power filters
control strategy
detection technology
harmonic suppression
reactive power compensation
compensation strategy
power quality control
power quality analysis
reactive power compensation
flexible AC systems
harmonic compensation
power electronic converters
voltage unbalance
PWM rectifier
voltage control
electromagnetic compatibility
voltage sag

Related Special Issue

Advanced Technologies in Power Quality and Solutions—2nd Edition in Energies

Published Papers (10 papers)

Download All Papers

Research

Jump to: Review

26 pages, 13364 KiB

Open AccessArticle

Analysis of Interharmonics Generation in Induction Motors Driven by Variable Frequency Drives and AC Choppers

by Alberto Gudiño-Ochoa, Jaime Jalomo-Cuevas, Jesús Ezequiel Molinar-Solís and Raquel Ochoa-Ornelas

Energies 2023, 16(14), 5538; https://0-doi-org.brum.beds.ac.uk/10.3390/en16145538 - 21 Jul 2023

Cited by 3 | Viewed by 1651

Abstract

In modern power systems, interharmonics have emerged as noninteger frequency components that appear in current or voltage signals. Double-stage AC-DC-AC converters have been identified as a primary source of interharmonics. Previous studies have highlighted modulation techniques, filters, passive components, unbalanced conditions and DC link effects as relevant factors. However, the interaction between these factors and the inertial properties of induction motors has not been explored. This study assesses various types of AC drives, including variable frequency drives (VFDs) and soft starters (AC choppers), to investigate their interaction with machine inertial properties in interharmonic generation. The employed technique for time-frequency spectral analysis is the wavelet synchrosqueezed transform combined with a clustering method. This paper demonstrates that the interaction of the inertial properties of low-power induction motors with the variations of the switching frequencies of the VFDs, the filters used in the DC link and a soft start indirectly contribute to harmonic generation and potentially to interharmonics in the electrical grid and the outputs of the inverter. Full article

(This article belongs to the Special Issue Advanced Technologies in Power Quality and Solutions)

► Show Figures

Figure 1

24 pages, 12464 KiB

Open AccessArticle

A Comprehensive Evaluation of Different Power Quantities in DC Electric Arc Furnace Power Supplies

by Pegah Hamedani, Cristian Garcia and Jose Rodriguez

Energies 2023, 16(9), 3888; https://0-doi-org.brum.beds.ac.uk/10.3390/en16093888 - 04 May 2023

Viewed by 1398

Abstract

Conventionally, DC arc furnaces are fed by thyristor rectifiers to control the level of current or power transferred to the load. With the advancement of high-power transistors, other structures such as diode rectifiers and DC choppers have been introduced and developed for the feeding system of DC electric arc furnaces. In this paper, the effect of different power supply systems on power quality indexes is discussed. In this regard, two types of feeding systems are considered, including a power supply system based on thyristor rectifiers and a power supply system based on diode rectifiers and DC choppers. In addition, different control methods, including constant current control (CCC) and constant power control (CPC), on DC electric arc furnaces are applied. For evaluating the power quality indexes, voltage and current harmonic distortion, unbalance of voltage and current, and power factor on the AC side are investigated for different power supply systems. Simulation results were performed with PSCAD/EMTDC software. It is shown that the power supply systems with diode rectifiers and DC choppers have superiority in comparison to the types based on thyristor rectifiers. According to the results, the average current THD is reduced from 16.55% in the thyristor rectifier to 8.40% in the chopper rectifiers with the CCC method and from 19.27% in the thyristor rectifier to 7.38% in the chopper rectifiers with the CPC method. Moreover, the average voltage THD is reduced from 5.67% in the thyristor rectifier to 3.02% in the chopper rectifiers with the CCC method. The result is similar to the CPC method. Furthermore, for a specific power supply system, the harmonic distortion is lower in the case of the CPC method than in the CCC method. Full article

(This article belongs to the Special Issue Advanced Technologies in Power Quality and Solutions)

► Show Figures

Figure 1

16 pages, 7709 KiB

Open AccessArticle

Collaborative Control Strategy of Power Quality Based on Residual Capacity of Photovoltaic Inverter

by Zekun Sun, Hao Liu, Yueming Ding, Haopeng Luo, Ting Liu and Qinyue Tan

Energies 2022, 15(21), 8049; https://0-doi-org.brum.beds.ac.uk/10.3390/en15218049 - 29 Oct 2022

Cited by 2 | Viewed by 1012

Abstract

With the large-scale distributed PV connected to the grid, the random and intermittent nature of PV output, the non-linearity of the inverter, as well as the low daytime base-load and large-scale back feeding cause outstanding power quality problems such as overvoltage, three-phase unbalance, and high harmonic content at the end of the power supply system, which seriously affects the safe and stable operation of the grid and power efficiency. Based on the residual capacity of the inverter, this paper investigates a cooperative power quality control strategy that integrates active power filter, reactive power compensation, and inverter functions to achieve comprehensive power quality control and management without adding additional hardware equipment. The validation results show that the control strategy strongly improves the power quality, grid security, stability, and efficiency. This strategy indicates significant economic benefits. Full article

(This article belongs to the Special Issue Advanced Technologies in Power Quality and Solutions)

► Show Figures

Figure 1

20 pages, 3651 KiB

Open AccessArticle

Flexible Interconnected Distribution Network with Embedded DC System and Its Dynamic Reconfiguration

by Huan Cai, Xufeng Yuan, Wei Xiong, Huajun Zheng, Yutao Xu, Yongxiang Cai and Jiumu Zhong

Energies 2022, 15(15), 5589; https://0-doi-org.brum.beds.ac.uk/10.3390/en15155589 - 01 Aug 2022

Cited by 4 | Viewed by 1448

Abstract

Flexible interconnection transformation of a distribution network using all-control power electronics technology will help to overcome the technical bottleneck of distributed generation (DG) penetration and high-quality power supply in the traditional distribution network. However, the flexible interconnection form that uses back-to-back power electronic converters to replace tie switches has disadvantages such as high cost and large footprint, so its mass promotion and application are bound to be limited. Therefore, a new topology of flexible interconnected distribution network with embedded DC system (FDN+EDC) with a better economy is proposed. Firstly, the topology of FDN+EDC is introduced to improve the controllability level of the distribution network under high percentage DG penetration, and is compared with the conventional flexible interconnection method. Secondly, in order to realize the coordinated optimal economic operation of source, network and load in the FDN+EDC, a dynamic reconfiguration model of switches status and continuous adjustment of flexible interconnection device (FID) are proposed. Then, to achieve a fast and globally optimal solution of the model, a hierarchical coordinated optimization strategy is designed based on an improved particle swarm algorithm for the optimization of discrete and continuous variables. Finally, the validity of the algorithm is verified, and an 88-node FDN+EDC is constructed to verify the advantages of the proposed embedded DC flexible interconnection topology and realize the joint optimal dispatch of network-source-load. Full article

(This article belongs to the Special Issue Advanced Technologies in Power Quality and Solutions)

► Show Figures

Figure 1

15 pages, 3418 KiB

Open AccessArticle

Optimization Configuration of Grid-Connected Inverters to Suppress Harmonic Amplification in a Microgrid

by Xing Sun, Wanjun Lei, Yuqi Dai, Yilin Yin and Qian Liu

Energies 2022, 15(14), 4989; https://0-doi-org.brum.beds.ac.uk/10.3390/en15144989 - 07 Jul 2022

Cited by 2 | Viewed by 1270

Abstract

This paper provides insight into the optimal configuration scheme of the grid-connected inverters based on harmonic amplification suppression. The connection of the inverters changes the natural resonance frequencies of the grid. Hence, a reasonable configuration of grid-connected inverters can optimize the impedance distribution and shift the natural resonance frequencies to frequency bands farther away from the harmonic sources. We proposed a scheme of site selection and determination of the number of inverters to suppress harmonic amplification. The resonance frequencies and modal frequency sensitivities (MFSs) were obtained by the resonance modal analysis (RMA). Moreover, the concepts of security region and insecurity region of resonance frequency were illustrated. The grid-connected sites can be obtained by calculating the participation factors (PFs) of the resonance frequencies in the insecurity region. Furthermore, the optimal number was determined by building the Norton equivalent circuit of the inverter and evaluating the output impedance at each frequency. Finally, simulations in Matlab/Simulink based on a modified IEEE-9 bus microgrid were utilized to verify the effectiveness of the proposed scheme. Full article

(This article belongs to the Special Issue Advanced Technologies in Power Quality and Solutions)

► Show Figures

Figure 1

18 pages, 5919 KiB

Open AccessArticle

Adaptive Charge-Compensation-Based Variable On-Time Control to Improve Input Current Distortion for CRM Boost PFC Converter

by Xinjun Liu, Donglai Zhang, Wanyang Wang, Fanwu Zhang, Jun Yuan and Ningyu Liu

Energies 2022, 15(11), 4021; https://0-doi-org.brum.beds.ac.uk/10.3390/en15114021 - 30 May 2022

Cited by 2 | Viewed by 1523

Abstract

For boost power factor correction (PFC) converters operating in critical conduction mode (CRM), charge compensation strategies are utilized to improve input current distortion. However, since massive calculations are required under complex working conditions, it is difficult to achieve accurate charge compensation with limited real-time computing resources. To solve this issue, this paper proposes an adaptive charge-compensation-based variable on-time (ACVOT) control strategy. The ACVOT controller calculates the required switching on-time by adding a fundamental value and an extended on-time. The fundamental value is adjusted by the loop compensator in each half-line cycle to provide a basic bias. The extended on-time is calculated based on partial charge compensation equation in each switching cycle to reduce the distortion. Compared with conventional digital variable on-time (VOT) control, the proposed strategy improves the input current total harmonics distortion (THD) and reduces the LUT/register resources by 54%/43% in FPGA realization. To verify the effectiveness of the proposed strategy, a 200 W prototype is built using the GaN HEMT transistor, where the THD is reduced to 1.4% at full load. Full article

(This article belongs to the Special Issue Advanced Technologies in Power Quality and Solutions)

► Show Figures

Graphical abstract

9 pages, 4423 KiB

Open AccessArticle

Harmonic Modeling and Analysis for Parallel 12-Pulse Rectifier under Unbalanced Voltage Condition in Frequency-Domain

by Guochao Qian, Qianggang Wang, Shun He, Weiju Dai, Nengqiao Wei and Niancheng Zhou

Energies 2022, 15(11), 3946; https://0-doi-org.brum.beds.ac.uk/10.3390/en15113946 - 26 May 2022

Cited by 2 | Viewed by 3175

Abstract

This paper treats a parallel 12-pulse rectifier as the study subject. The influence of unbalanced terminal voltage, the triggering angle, as well as the commutation angle of a thyristor-controlled rectifier circuit are considered in switching functions. Then, a frequency-domain harmonic coupled admittance matrix under the effect of positive sequence and negative sequence voltages are proposed, respectively. With the integration of the above matrices, a harmonic coupled admittance matrix model of a parallel 12-pulse rectifier under unbalanced voltage is proposed. On this basis, a simplified harmonic model of a 12-pulse rectifier is established, which only considers the effect of major elements through analyzing the elements’ distribution and magnitude of the harmonic coupled admittance matrix, as well as the AC current harmonic producing mechanism. All the models proposed in this paper are verified with high accuracy through simulation in MATLAB/Simulink. The models proposed in this paper can be used to guide the selection of harmonic suppression measures and equipment. Full article

(This article belongs to the Special Issue Advanced Technologies in Power Quality and Solutions)

► Show Figures

Figure 1

13 pages, 5795 KiB

Open AccessArticle

Ferro-Resonance Analysis of Capacitor Voltage Transformer with Fast Saturation Damper

by Xinzhi Ding, Kai Yang, Weiyu Wang, Bin Liu, Xuejin Wang, Jie Zhang and Dayi Li

Energies 2022, 15(8), 2791; https://0-doi-org.brum.beds.ac.uk/10.3390/en15082791 - 11 Apr 2022

Cited by 7 | Viewed by 2176

Abstract

With the increase in capacitor voltage transformer (CVT) operation life, CVT impedance changes, and the short-time switching of overhead lines, it is very easy to cause a transient oscillation accident in which a CVT participates, reduce the insulation level of a CVT, and even induce regional power grid oscillation and easily cause capacitor breakdown, after long-term operation with defects. In this paper, the whole power network, including the generator, power grid, and consumer, is modeled, and the theoretical model of the CVT ferro-resonance connected grid is built. The frequency spectrum analysis, and the measurements of resonance bus voltage and line voltage, were carried out to find the design method of a fast saturation damper (FSD) and its voltage–current characteristics that affect the vibration, based on theory and practice; this paper puts forward effective measures to reduce the resonance effect of a CVT in operation, and avoid the oscillation of the line and even the regional power grid system. Full article

(This article belongs to the Special Issue Advanced Technologies in Power Quality and Solutions)

► Show Figures

Figure 1

13 pages, 2480 KiB

Open AccessArticle

Fault Diagnosis of Submersible Motor on Offshore Platform Based on Multi-Signal Fusion

by Yahui Zhang and Kai Yang

Energies 2022, 15(3), 756; https://0-doi-org.brum.beds.ac.uk/10.3390/en15030756 - 20 Jan 2022

Cited by 2 | Viewed by 1548

Abstract

As an important production equipment of the offshore platform, the operation reliability of submersible motors is critical to oil and gas production, natural gas energy supplies, and social and economic benefits, etc. In order to realize the health management and fault diagnosis of submersible motors, a motor fault-monitoring method based on multi-signal fusion is proposed. The current signals and vibration signals were selected as characteristic signals. Through fusion correlation analysis, the correlation between different signals was established to enhance the amplitude at the same frequency, so as to highlight the motor fault characteristic frequency components, reduce the difficulty of fault identification, and provide sample data for motor fault pattern identification. Furthermore, the wavelet packet node energy analysis and back propagation neural network were combined to identify the motor faults and realize the real-time monitoring of the operating status of the submersible motor. The genetic algorithm was used to optimize the parameters of the neural network model to improve the accuracy of motor fault pattern recognition. The results show that the combination of multi-signal fusion monitoring and an artificial intelligence algorithm can diagnose motor fault types with high confidence. This research originally proposed the fusion correlation spectrum technology, which solved the shortcomings of the small amplitude and complex composition of the single signal spectrum components in the fault diagnosis and improved the reliability of the fault diagnosis. It further combined the neural network to realize the automatic monitoring and intelligent diagnosis of submersible motors, which has certain application value and inspiration in the field of electrical equipment intelligent monitoring. Full article

(This article belongs to the Special Issue Advanced Technologies in Power Quality and Solutions)

► Show Figures

Figure 1

Review

Jump to: Research

13 pages, 2909 KiB

Open AccessReview

A Review of the Research on the Wide-Band Oscillation Analysis and Suppression of Renewable Energy Grid-Connected Systems

by Zhu Liu, Dayi Li, Weiyu Wang, Jinfeng Wang and Dehuang Gong

Energies 2024, 17(8), 1809; https://0-doi-org.brum.beds.ac.uk/10.3390/en17081809 - 10 Apr 2024

Viewed by 302

Abstract

With the continuous expansion of the scale of power generated by grid-connected renewable energy, the form and operation characteristics of power grids have undergone significant changes, and the power electronic characteristics of power systems are prominent, resulting in the frequent occurrence of wide-band oscillation problems when renewable energy power generation equipment is connected to a power grid. Oscillation has the characteristics of nonlinearity and has an oscillation frequency ranging from a few hertz to several thousand hertz or more, which seriously threatens the stable operation of power grids. This paper summarizes the wide-band oscillation events that occur worldwide under the background of renewable energy access to power grids, classifies the wide-band oscillation events according to the distribution of oscillation frequency bands, and sorts out the characteristics of various oscillations. From the perspectives of the source side and network side, the existing oscillation suppression measures are classified and prospected. Full article

(This article belongs to the Special Issue Advanced Technologies in Power Quality and Solutions)

► Show Figures

Figure 1

Journal Menu

Journal Browser

Advanced Technologies in Power Quality and Solutions

Share This Special Issue

Special Issue Editor

Special Issue Information

Keywords

Related Special Issue

Published Papers (10 papers)

Research

Review

Further Information

Guidelines

MDPI Initiatives

Follow MDPI