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State-of-the-Art of Electrical Power and Energy System in China

A topical collection in Energies (ISSN 1996-1073). This collection belongs to the section "F: Electrical Engineering".

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Editor

Topical Collection Information

Dear Colleagues,

We are inviting submissions to the Energies Topical Collection on “State-of-the-Art of Electrical Power and Energy System in China”.

This Topical Collection is focused on reviews and technical studies on the generation, conversion, storage, transmission, application, and architecture of electrical power and energy systems, particularly in China.

Electrical power/electrical energy is currently the most widely used secondary energy source. Electrical energy has obvious merits, such as cleanliness, low emissions, low carbon footprint, feasible and convenient control, low transmission cost, high energy-conversion efficiency, feasible control, etc. In particular, the generation, conversion, storage, transmission, and utilization technologies of electrical energy is the key to benefiting from power devices and improving the overall efficiency of energy systems. In addition, renewable and sustainable energy sources are normally converted into electrical energy and supplied for human usage. Moreover, in recent years, electrical energy technologies have received extensive attention from both academia and industry. Electrical energy technologies cover a wide range, particularly integrated with novel materials or advanced processes. Thus, there are many perspectives from which we can review these mature and advanced energy system technologies.

First, the technology of utilizing renewable energy to generate electrical energy can include two key processes. The first step is that energy-harvesting devices are needed to explore implicit energy sources from the nature. The second step is that the high-quality electrical power is produced by energy conversion devices, such as wind power generator, waterpower generator, thermal power generator, etc.

Second, in the process of converting electrical energy to other energy types, improving conversion efficiency is a classic problem. In addition, the design, optimization, and fault tolerance of energy conversion systems and auxiliary devices are also within the technical scope of energy system technologies.

Third, electrical energy storage is particularly important for some relatively closed applications, such as electric vehicles, electric ships, and electric aircrafts in the area of transportation. The utilization of novel materials and packaging for electrodes and electrolytes provides the possibility of increasing battery capacity for electrical energy storage.

Fourth, the transmission and utilization technology of electrical energy requires high-performance electrical power converters of different power levels. For instance, wireless power transfer technology eliminates the need for transmission cables, which has been welcomed in recent years. However, there is still a long way to go in terms of providing power levels, increasing transmission distances, and reducing high-frequency electromagnetic radiation, as well as incorporating silicon carbide (SiC) and gallium nitride (GaN). The use of wide bandgap semiconductors, which is revolutionizing power electronics converters, is also welcomed by industries.

China is a large country in the production and application of electrical energy with related technologies. The involvement of large demand and extensive utilization of electric energy in China often forms a unique electrical energy architecture and system scale. On such a scale, related technologies in the field of electrical energy and energy systems can be combined organically.

This Topical Collection intends to report the latest progress in these important areas.

Dr. Chunhua Liu
Collection 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 collection 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

  • electrical power
  • electrical energy system
  • electric motor and generator
  • electrical power converter
  • wireless power transfer
  • electrical energy storage
  • renewable energy
  • power system
  • energy conversion
  • energy utilization

Published Papers (2 papers)

2025

Jump to: 2022

21 pages, 4124 KiB  
Article
Enhanced Models for Wind, Solar Power Generation, and Battery Energy Storage Systems Considering Power Electronic Converter Precise Efficiency Behavior
by Binxin Zhu, Junliang Liu, Shusheng Wang and Zhe Li
Energies 2025, 18(6), 1320; https://doi.org/10.3390/en18061320 - 7 Mar 2025
Cited by 1 | Viewed by 486
Abstract
The large-scale integration of wind, solar, and battery energy storage is a key feature of the new power system based on renewable energy sources. The optimization results of wind turbine (WT)–photovoltaic (PV)–battery energy storage (BES) hybrid energy systems (HESs) can influence the economic [...] Read more.
The large-scale integration of wind, solar, and battery energy storage is a key feature of the new power system based on renewable energy sources. The optimization results of wind turbine (WT)–photovoltaic (PV)–battery energy storage (BES) hybrid energy systems (HESs) can influence the economic performance and stability of the electric power system (EPS). However, most existing studies have overlooked the effect of power electronic converter (PEC) efficiency on capacity configuration optimization, leading to a significant difference between theoretical optimal and actual results. This paper introduces an accurate efficiency model applicable to different types of PECs, and establishes an enhanced mathematical model along with constraint conditions for WT–PV–BES–grid–load systems, based on precise converter efficiency models. In two typical application scenarios, the capacity configurations of WT–PV–BES are optimized with optimal cost as the objective function. The different configuration results among ignoring PEC loss, using fixed PEC efficiency models, and using accurate PEC efficiency models are compared. The results show that in the DC system, the total efficiency of the system with the precise converter efficiency model is approximately 96.63%, and the cost increases by CNY 49,420, about 8.56%, compared to the system with 100% efficiency. In the AC system, the total efficiency with the precise converter efficiency model is approximately 97.64%, and the cost increases by CNY 4517, about 2.02%, compared to the system with 100% efficiency. The analysis clearly reveals that the lack of an accurate efficiency model for PECs will greatly affect the precision and effectiveness of configuration optimization. Full article
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2022

Jump to: 2025

25 pages, 4261 KiB  
Article
Overview of Propulsion Systems for Unmanned Aerial Vehicles
by Bowen Zhang, Zaixin Song, Fei Zhao and Chunhua Liu
Energies 2022, 15(2), 455; https://doi.org/10.3390/en15020455 - 10 Jan 2022
Cited by 68 | Viewed by 22970
Abstract
Unmanned Aerial Vehicle (UAV) propulsion technology is significantly related to the flight performance of UAVs, which has become one of the most important development directions of aviation. It should be noted that UAVs have three types of propulsion systems, namely the fuel, hybrid [...] Read more.
Unmanned Aerial Vehicle (UAV) propulsion technology is significantly related to the flight performance of UAVs, which has become one of the most important development directions of aviation. It should be noted that UAVs have three types of propulsion systems, namely the fuel, hybrid fuel-electric, and pure electric, respectively. This paper presents and discusses the classification, working principles, characteristics, and critical technologies of these three types of propulsion systems. It is helpful to establish the development framework of the UAV propulsion system and provide the essential information on electric propulsion UAVs. Additionally, future technologies and development, including the high-power density motors, converters, power supplies, are discussed for the electric propulsion UAVs. In the near future, the electric propulsion system would be widely used in UAVs. The high-power density system would become the development trend of electric UAVs. Thus, this review article provides comprehensive views and multiple comparisons of propulsion systems for UAVs. Full article
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Figure 1

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