Celebrating the 128th Anniversary of Sichuan University—Electrical and Electronic Engineering

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

Deadline for manuscript submissions: closed (15 May 2025) | Viewed by 1640

Special Issue Editors

College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Interests: power system stability and control; HVDC technology; DC grids; FACTS
Special Issues, Collections and Topics in MDPI journals
College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Interests: AC–DC hybrid power systems; HVDC; renewable power integration
Special Issues, Collections and Topics in MDPI journals
College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Interests: power system design planning and optimal operation; renewable energy power system
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

As golden autumn leaves grace the campus, we mark the 128th anniversary of Sichuan University, a milestone that resonates with pride and academic excellence. To commemorate this historic occasion and perpetuate the rich scholarly tradition and pioneering research spirit of our institution, we are delighted to announce a special academic paper solicitation.

This call for papers invites contributions from faculty and students across the globe, aiming to showcase the diverse research achievements and innovative thinking within the field of electrical engineering and its intersections with other disciplines. We warmly welcome original research papers and academic reviews that embody novelty, originality, and practical significance. The topics of this session include, but are not limited to, the following:

  • Power system stability and control.
  • AC-DC system operation and analysis.
  • Power system design planning.
  • Power system optimal operation.
  • AI technologies application in power system.

Dr. Baohong Li
Dr. Qin Jiang
Dr. Yue Yin
Guest Editors

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Keywords

  • stability and control
  • HVDC
  • design planning
  • optimal operation
  • AI technologies

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Published Papers (3 papers)

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Research

23 pages, 5335 KiB  
Article
Enhanced Power Sharing Control of an Islanded DC Microgrid with Unmatched Line Impedances
by Mulualem Tesfaye, Abdelhakim Saim, Azeddine Houari, Mohamed Machmoum and Jean-Christophe Olivier
Electronics 2025, 14(8), 1654; https://doi.org/10.3390/electronics14081654 - 19 Apr 2025
Viewed by 259
Abstract
Nowadays, the rise of DC loads along with distributed energy resources (DERs) and energy storage systems (ESSs) have led to a growing interest in using direct current (DC) microgrid systems. Conventional droop control methods face significant limitations when applied to parallel-connected distributed generation [...] Read more.
Nowadays, the rise of DC loads along with distributed energy resources (DERs) and energy storage systems (ESSs) have led to a growing interest in using direct current (DC) microgrid systems. Conventional droop control methods face significant limitations when applied to parallel-connected distributed generation (DG) units, particularly in achieving balanced power sharing and minimizing voltage deviations. To overcome this issue, an enhanced power sharing control method is proposed in this paper to address load sharing in parallel-connected DG units based DC microgrids, considering unmatched line impedance and load variation. The enhanced control method aims to achieve balanced load power sharing and voltage control through the use of a Luenberger observer to estimate the Point of Common Coupling (PCC) bus voltage and accordingly estimate the voltage deviation. The proposed method compensates for the effects of unmatched line impedances and dynamic load variations, enabling accurate power sharing and precise DC bus voltage regulation. Various scenarios are studied to evaluate the performance of the proposed method under different operating conditions including system and load parameters variations. Finally, the performance of the proposed control method was validated through real-time simulation using OPAL-RT target, and compared with conventional droop control approaches. Full article
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17 pages, 5534 KiB  
Article
The Pole-to-Ground Fault Current Calculation Method and Impact Factor Investigation for Monopole DC Grids
by Liang Chen, Wei Yi, Pan Deng, Shen Ma, Da Kuang and Hongyu Cai
Electronics 2025, 14(6), 1067; https://doi.org/10.3390/electronics14061067 - 7 Mar 2025
Viewed by 496
Abstract
Flexible DC grids are an important technological means for optimizing power supply structures and promoting energy transition. However, as a system with low inertia and weak damping, the flexible DC grid inherently faces challenges, such as rapid rising of fault currents, vulnerability to [...] Read more.
Flexible DC grids are an important technological means for optimizing power supply structures and promoting energy transition. However, as a system with low inertia and weak damping, the flexible DC grid inherently faces challenges, such as rapid rising of fault currents, vulnerability to significant damage, difficulty in fault interruption, and with regard to the poor overcurrent-withstanding capabilities of power electronic devices. To address these issues, this paper proposes a method for calculating the single-pole ground fault current in a symmetrical monopolar DC grid, and further introduces a matrix exponential calculation method. This method enables quantitative analysis of the influence of various component parameters on the fault current, taking into account the dynamic characteristics of both the faulted and healthy poles in the DC system. The results demonstrate the high accuracy of this calculation method. The analysis reveals that the inductance of the faulted branch has the greatest impact on the fault current, while the inductances of the adjacent outgoing lines also have a certain influence. In contrast, the inductances of lines not adjacent to the faulted branch have minimal impacts on the fault current. Furthermore, the grounding electrode parameters of the converter station connected to the faulted branch exert the most significant influence on the fault current, with the grounding electrode parameters of neighboring converter stations also showing a notable effect. This indicates that the fault current is impacted by the topology of the nearby DC grid, but is not affected by the fault currents at remote converter stations. Full article
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14 pages, 3400 KiB  
Article
The Hybrid AC-DC Dynamic Order-Reduced Modeling Method and Damping Enhancement Strategy Based on Improved ERAG
by Bo Zhou, Xinwei Sun, Wei Wei and Yunyang Xu
Electronics 2024, 13(24), 5044; https://doi.org/10.3390/electronics13245044 - 22 Dec 2024
Cited by 1 | Viewed by 533
Abstract
Decentralized control offers a more effective way to avoid the complexities and coordination challenges encountered in centralized control. In the decentralized design of additional controllers for multi-infeed DC transmission systems, it is crucial to focus on the interactions among the controllers. To solve [...] Read more.
Decentralized control offers a more effective way to avoid the complexities and coordination challenges encountered in centralized control. In the decentralized design of additional controllers for multi-infeed DC transmission systems, it is crucial to focus on the interactions among the controllers. To solve this problem, this paper primarily discusses an enhanced damping characteristic method for hybrid AC-DC systems based on an improved Effective Relative Gain Array (ERGA) index. Initially, feedback signals with better control effects on existing oscillation modes are pre-screened. Subsequently, the ERGA-based interaction index is utilized to pair these feedback signals with control locations, aiming to identify the optimal pairing scheme with the minimum index value, indicating the least interaction effect. This approach minimizes the mutual influence between loops and reduces adverse interactions among controllers. Simulations of multi-DC additional damping controllers designed using the multi-stage Linear Quadratic Regulator (LQR) method in a multi-DC system demonstrate that the optimal pairing scheme significantly outperforms both uncontrolled and poorly paired schemes in controlling low-frequency oscillations, thereby validating the optimality of the proposed method. Furthermore, various disturbances are introduced to verify the effectiveness and robustness of the proposed control strategy against low-frequency oscillations. Full article
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