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Frontier in Special Power Conversion Systems and Control
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Frontier in Special Power Conversion Systems and Control

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

Deadline for manuscript submissions: closed (20 January 2022) | Viewed by 13071

Special Issue Editor

Prof. Dr. Fujun Ma

E-Mail Website
Guest Editor
College of Electrical and Information Engineering, Hunan University, Changsha, China
Interests: green power conversion and electric energy-saving technology; distribution active filter and reactive compensation; railway power quality control; modular multilevel converter MMC; high-frequency switching power supply; new energy inverters and grid-connected control; energy router
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The efficient utilization of energy, which is an inevitable requirement for sustainable development, has recently attracted global attention. In order to build a clean, low-carbon, optimized energy structure system and achieve the dual carbon goals of carbon peaking and carbon neutrality, the efficient conversion of electric energy has become a significant part of future green development technology. Therefore, various special power converters and control systems will be discussed in this issue. The green and efficient conversion of electric energy will provide important technical support and guarantee for the sustainable development of a carbon-neutral society.

In the field of renewable energy, with the rapid development of renewable energy sources such as photovoltaics, wind power, and energy storage, a large amount of power electronic conversion equipment is connected to the grid. Identifying how to realize the efficient operation of multienergy systems and energy management has become a growing focus.

In the industrial electricity supply fields (such as railways, metallurgy, petrochemicals, buildings, etc.), problems such as aging and low operating efficiency exist in traditional power supply equipment. In order to improve the efficiency and operational reliability of the power supply system, it is necessary to study various advanced green power electronic converters and control systems.

In the field of power quality governance, different kinds of special power quality compensators and control systems (for the railways, metallurgy, petrochemicals, etc.) are needed, such as modular multilevel converters (MMCs), high-voltage static Var generators (SVGs), and railway power conditioners (RPCs), which can be used to improve the efficiency and stability of the power distribution systems.

In the field of electric drives, the rapid development of a high-speed railway and electric vehicles have become standard equipment for people’s green travel. In order to improve users’ comfort, requirements for high efficiency and high-power density are put forward for converters and electric drive systems.

This Special Issue is focused on bringing innovative developments and synergies in the fields of Special Power Conversion Systems and Control, aimed at realizing efficient and comprehensive utilization of energy.

Prof. Dr. Fujun Ma
Guest Editor

Topics/Keywords (Including but not limited to these):

• New energy converters and control
• Multi-port energy routers and control
• Power electronic transformers and control
• Energy management of multi-energy system
• Energy storage converters and control
• DC distribution network
• AC and DC mixed distribution network
• Modeling and stability analysis of multi-energy system
• Power supply and control for special application scenarios
• Electrical energy-saving technology
• Power quality analysis for special application scenarios
• Power quality governance for special application scenarios
• High-voltage SVG and control
• Modular multilevel converter(MMC) and control
• Railway power conditioner(RPC) and control
• Special power drive systems and control
• High efficiency, high power density of power electronic systems
• High reliability of power electronic systems

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.

Published Papers (7 papers)

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Research

17 pages, 13909 KiB  
Article
Energy Storage Economic Optimization Scheduling Method for Multi-Scene Demand of Peak and Frequency Modulation
by Wen Wei, Yali Wang, Shuangfeng Dai, Changqing Chen and Lei Chen
Energies 2021, 14(24), 8605; https://0-doi-org.brum.beds.ac.uk/10.3390/en14248605 - 20 Dec 2021
Cited by 6 | Viewed by 1982
Abstract
Energy storage (ES) only contributes to a single-scene (peak or frequency modulation (FM)) control of the power grid, resulting in low utilization rate and high economic cost. Herein, a coordinated control method of peak modulation and FM based on the state of ES [...] Read more.
Energy storage (ES) only contributes to a single-scene (peak or frequency modulation (FM)) control of the power grid, resulting in low utilization rate and high economic cost. Herein, a coordinated control method of peak modulation and FM based on the state of ES under different time scales is proposed. Firstly, for monotone peak and FM control scenarios, the ES configuration and scheduling model is constructed with the goal of maximizing net profit. Secondly, to further improve the ES utilization rate and optimize the operating cost of ES, a cooperative control method of peak modulation and FM is proposed. This method can realize the switch between peak modulation and FM control of ES and improve the ES utilization rate and system economy. Finally, the simulation results show that, compared with that of mono-peak and single-FM control, the ES efficiency of the peak-FM multiscenario optimization scheduling method is improved by 16.25% and 37.29%, respectively. The annual net income is increased by €28,021.50, the investment recovery period is shortened by 0.27 years, and the ES configuration economy is effectively improved. Full article
(This article belongs to the Special Issue Frontier in Special Power Conversion Systems and Control)
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24 pages, 9039 KiB  
Article
Free Switching Control Strategy for Multi-Operation Modes of Multi-Port Energy Router in Distribution Area
by Shumei Chi, Zhipeng Lv, Lan Liu and Yang Shan
Energies 2021, 14(23), 7860; https://0-doi-org.brum.beds.ac.uk/10.3390/en14237860 - 23 Nov 2021
Cited by 3 | Viewed by 1593
Abstract
For the distribution area with a high penetration rate of new energy, the traditional power supply system has some problems, such as a single form of power supply and low utilization of new energy. Because the multi-port energy router can realize the interconnection [...] Read more.
For the distribution area with a high penetration rate of new energy, the traditional power supply system has some problems, such as a single form of power supply and low utilization of new energy. Because the multi-port energy router can realize the interconnection and complementation of multiple energy forms, it has become the key piece of equipment in the hybrid AC/DC distribution area. Nevertheless, restricted by the existing control strategy, the performance of the energy router in complex operation mode switching and coordinated control still needs to be further improved. To address this issue, the free switching control strategy is proposed in this paper. Firstly, the topology and model of the multi-port energy router are designed and established. Secondly, the operation mode of the system is analyzed, and the control strategy of each port is designed. Then, a reference power calculation method suitable for multi-mode operation is derived. Based on this, the control strategy does not need to be changed when operation modes are switched. Furthermore, the extended state observer is introduced to track and compensate for the new energy disturbance, which can improve the power quality of the system. Finally, the simulation and experimental results show that the proposed control strategy of the multi-port energy router can realize flexible and controllable power transmission among various modules in the distribution area and the free switching of multi-operation modes without changing the control strategy. Full article
(This article belongs to the Special Issue Frontier in Special Power Conversion Systems and Control)
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14 pages, 811 KiB  
Article
Multi-Objective Unified Optimal Control Strategy for DAB Converters with Triple-Phase-Shift Control
by Jinhui Zeng, Yao Rao, Zheng Lan, Dong He, Fan Xiao and Bei Liu
Energies 2021, 14(20), 6444; https://0-doi-org.brum.beds.ac.uk/10.3390/en14206444 - 09 Oct 2021
Cited by 4 | Viewed by 2075
Abstract
To solve the problems of large current stress, difficult soft-switching of all switches, and slow dynamic response of dual active bridge converters, a multi-objective unified optimal control strategy based on triple-phase-shift control was proposed. The forward power flow global modes of triple-phase-shift control [...] Read more.
To solve the problems of large current stress, difficult soft-switching of all switches, and slow dynamic response of dual active bridge converters, a multi-objective unified optimal control strategy based on triple-phase-shift control was proposed. The forward power flow global modes of triple-phase-shift control were analyzed, and three high-efficiency modes were selected to establish the analytical models of current stress and soft-switching. Combined with these models, the optimal solutions in different modes were derived by using the cost function-optimization equation to overcome the limitation of the Lagrange multiplier method, such that the DAB converter achieved the minimum current stress, and all switches operated in the soft-switching state over the entire power range. At the same time, the virtual power component was introduced in the phase-shift ratio combination, which improved the dynamic response of output voltage under the input voltage or load steps changed by power control. The theoretical analysis and experimental results show that the proposed control strategy can optimize the performance of the DAB converter from three aspects, such as current stress, soft-switching, and dynamic response, which achieves multi-objective optimization of the steady-state and dynamic performance of DAB converters. Full article
(This article belongs to the Special Issue Frontier in Special Power Conversion Systems and Control)
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20 pages, 5644 KiB  
Article
Multi-Port and -Functional Power Conditioner and Its Control Strategy with Renewable Energy Access for a Railway Traction System
by Fujun Ma, Yulin Kuang, Zhengwen Wang, Gelin Huang, Dexing Kuang and Cheng Zhang
Energies 2021, 14(19), 6146; https://0-doi-org.brum.beds.ac.uk/10.3390/en14196146 - 27 Sep 2021
Cited by 5 | Viewed by 1598
Abstract
To relieve the contradiction between supply and demand, a multi-port power conditioner (MP-PC) and control strategy with renewable energy access for a railway traction system is presented, which is mainly composed of full-bridge-based MMC and isolated DC/DC converters. As for the full-bridge-based MMC, [...] Read more.
To relieve the contradiction between supply and demand, a multi-port power conditioner (MP-PC) and control strategy with renewable energy access for a railway traction system is presented, which is mainly composed of full-bridge-based MMC and isolated DC/DC converters. As for the full-bridge-based MMC, the equivalent model is established and its novel voltage control method is proposed, which can provide a medium/low-voltage DC-link. A renewable energy system is connected to the system through the DC-link, so the MP-PC can achieve on-site consumption and balance between the load power and output power of RESs. Meanwhile, with the proposed control strategy, MP-PC can achieve three-phase power balance control and improve the operation performance of the railway traction system. Finally, the traction power platform and simulation model are established in the lab, and the topology and control strategy of MP-PC are verified effectively. Full article
(This article belongs to the Special Issue Frontier in Special Power Conversion Systems and Control)
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15 pages, 4977 KiB  
Article
An Ultra-Fast Power Prediction Method Based on Simplified LSSVM Hyperparameters Optimization for PV Power Smoothing
by Zhenxing Zhao, Kaijie Chen, Ying Chen, Yuxing Dai, Zeng Liu, Kuiyin Zhao, Huan Wang and Zishun Peng
Energies 2021, 14(18), 5752; https://0-doi-org.brum.beds.ac.uk/10.3390/en14185752 - 13 Sep 2021
Cited by 7 | Viewed by 1295
Abstract
With existing power prediction algorithms, it is difficult to satisfy the requirements for prediction accuracy and time when PV output power fluctuates sharply within seconds, so this paper proposes a high-precision and ultra-fast PV power prediction algorithm. Firstly, in order to shorten the [...] Read more.
With existing power prediction algorithms, it is difficult to satisfy the requirements for prediction accuracy and time when PV output power fluctuates sharply within seconds, so this paper proposes a high-precision and ultra-fast PV power prediction algorithm. Firstly, in order to shorten the optimization time and improve the optimization accuracy, the single-iteration Gray Wolf Optimization (SiGWO) method is used to simplify the iteration process of the hyperparameters of Least Squares Support Vector Machine (LSSVM), and then the hybrid local search algorithm composed of Iterative Local Search (ILS) and Self-adaptive Differential Evolution (SaDE) is used to improve the accuracy of hyperparameters, so as to achieve high-precision and ultra-fast PV power prediction. The power prediction model is established, and the proposed algorithm is applied in a test experiment which can complete the power prediction within 3 s, and the RMSE is only 0.44%. Finally, combined with the PV-storage advanced smoothing control strategy, it is verified that the performance of the proposed algorithm can satisfy the system’s requirements for prediction accuracy and time under the condition of power mutation in a PV power generation system. Full article
(This article belongs to the Special Issue Frontier in Special Power Conversion Systems and Control)
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21 pages, 6756 KiB  
Article
Configuration Method and Multi-Functional Strategy for Embedding Energy Storage into Wind Turbine
by Changqing Chen and Xinran Li
Energies 2021, 14(17), 5354; https://0-doi-org.brum.beds.ac.uk/10.3390/en14175354 - 28 Aug 2021
Cited by 6 | Viewed by 1261
Abstract
This paper proposes a Configuration method for energy storage (ES), in which the ES inertia of ES is equal to an equal capacity synchronous generator. The purpose is to enhance the frequency modulation capability of double-fed induction generator (DFIG) and wind power consumption. [...] Read more.
This paper proposes a Configuration method for energy storage (ES), in which the ES inertia of ES is equal to an equal capacity synchronous generator. The purpose is to enhance the frequency modulation capability of double-fed induction generator (DFIG) and wind power consumption. Through the proposed method, the system inertia can remain unchanged after the DFIGs replacing the conventional turbines. During the DFIG rotor speed recovery, the ES releases energy to compensate for sudden changes in active power. On this basis, the DFIG and ES structure model is created, and the ES control strategy is optimized, thereby effectively improving the DFIG frequency modulation capability. Besides, in the non-frequency modulation period, the ES is used to suppress wind power fluctuations, thereby improving system wind power consumption and ES utilization. Simulation results indicate, in the ES-embedded wind turbine structure model, the combination of the ES Configuration method and multi-functional strategy significantly improves the frequency modulation ability and anti-interference performance of a single DFIG. Moreover, the wind power consumption and ES utilization are improved, and the ES achieves additional value. Full article
(This article belongs to the Special Issue Frontier in Special Power Conversion Systems and Control)
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15 pages, 35379 KiB  
Article
A New SVPWM Strategy for Three-Phase Isolated Converter with Current Ripple Reduction
by Sheng Wang, Huaibao Wang, Hao Ding, Ligen Xun and Sifan Wu
Energies 2021, 14(16), 4966; https://0-doi-org.brum.beds.ac.uk/10.3390/en14164966 - 13 Aug 2021
Cited by 3 | Viewed by 1845
Abstract
Three-phase isolated matrix converters enable bidirectional power conversion and galvanic isolation, and they are suitable for widespread applications in industry. However, excessive DC-link current ripple not only increases the inductor loss and switching loss but also causes more electromagnetic interference and grid current [...] Read more.
Three-phase isolated matrix converters enable bidirectional power conversion and galvanic isolation, and they are suitable for widespread applications in industry. However, excessive DC-link current ripple not only increases the inductor loss and switching loss but also causes more electromagnetic interference and grid current distortion. Traditionally, increasing DC-link inductance or switching frequency can reduce the current ripple to a certain extent, but it is not cost-effective due to the bulky size of the inductor and higher switching losses. To address the above issue, optimizing the modulation control strategy is more attractive. This paper proposes a new SVPWM strategy to reduce the current ripple. First, the inherent limitation of the conventional modulation scheme is revealed. Then, the new optimal modulation scheme is proposed for the isolated matrix converters to reduce the current ripple without increasing the DC-link inductor or switching frequency. Moreover, the power density of the system is effectively increased. Finally, simulation in a MATLAB environment and a laboratory prototype of the isolated matrix converter have been built to verify the effectiveness of the proposed strategy. Full article
(This article belongs to the Special Issue Frontier in Special Power Conversion Systems and Control)
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