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Symmetry
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Advances in Intelligent Power Electronics with Symmetry/Asymmetry
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Advances in Intelligent Power Electronics with Symmetry/Asymmetry

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: closed (31 March 2026) | Viewed by 2529

Special Issue Editors

Dr. Nikolay Hinov

E-Mail Website
Guest Editor
Faculty of Computer Systems and Technologies, Department of Computer Systems, Technical University in Sofia, 8 Ohridski Blvd., 1000 Sofia, Bulgaria
Interests: artificial intelligence; mathematical modeling; control theory and applications; smart cities and smart grids
Special Issues, Collections and Topics in MDPI journals
Dr. Valeri Petrov Gochev

E-Mail Website
Guest Editor
Associate Professor, Department of Telecommunications, University of Telecommunications and Posts, 1700 Sofia, Bulgaria
Interests: power electronics; electronic circuits; pattern recognition; fuzzy rules

Special Issue Information

Dear Colleagues,

The topic of “Advances in Intelligent Power Electronics with Symmetry/Asymmetry” refers to the development of technologies and methods in the field of power electronics that use principles of symmetry and asymmetry to improve the efficiency, reliability and functionality of power electronic devices and systems.

In symmetrical power systems, such as H-bridge inverters, symmetry provides an even distribution of currents and voltages, resulting in better stability and reduced electromagnetic interference. Thus, the use of symmetrical topologies in converters can provide better control of power lines and a reduction in harmonics.

On the other hand, asymmetry can be used to optimize the specific performance of power electronic devices, such as by reducing switching losses or improving efficiency under different operating and load modes.

The use of intelligent controllers enables dynamic control of symmetry and asymmetry in power electronic devices and systems, adapting their operations to changing load or power supply conditions.

Advances in intelligent symmetric and asymmetric power electronics provide new opportunities to improve the performance and performance assurance of power electronic devices and systems. The use of intelligent algorithms and controllers for dynamic control of symmetry and asymmetry in these systems greatly expands their applications in industrial production, energy, transport and household.

This Special Issue aims to encourage researchers by combining symmetry/asymmetry in the operation modes and topologies of power circuits and systems, as well as intelligent controllers, to obtain optimally designed power electronic devices and systems with guaranteed performance and improved characteristics that provide reliable and effective operations throughout their life cycle.

In this Special Issue, original research articles and reviews are welcome. Research areas may include but are not limited to the following:

  • optimizing energy efficiency through symmetric and asymmetric topologies;
  • dynamic control of symmetry and asymmetry in real time;
  • intelligent adaptive controllers for asymmetric/symmetric power systems;
  • symmetry and asymmetry in multiphase systems;
  • minimization of electromagnetic interference by means of symmetrical and asymmetrical techniques;
  • research on new materials for symmetric and asymmetric components in power electronics;
  • the implementation of intelligent sensor systems for control of symmetry/asymmetry in power electronic systems in real time;
  • design of symmetric/asymmetric converters for specific applications;
  • modeling, simulation and prototyping of symmetric/asymmetric power devices and systems;
  • development of intelligent communication protocols in symmetric/asymmetric power devices and systems.

Dr. Nikolay Hinov
Dr. Valeri Petrov Gochev
Guest Editors

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 250 words) can be sent to the Editorial Office for assessment.

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. Symmetry is an international peer-reviewed open access monthly 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 2400 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

  • adaptive algorithms
  • asymmetry
  • energy efficiency
  • loss optimization
  • intelligent controllers
  • power circuit topology
  • power electronic devices and systems
  • predictive control
  • real-time diagnostics
  • symmetry

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Published Papers (3 papers)

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Research

34 pages, 5080 KB  
Article
Symmetry and Extended Duality in Resonant DC-AC Inverters: Open-Input and Closed-Input Operation Below and Above Resonance
by Nikolay Hinov
Symmetry 2026, 18(4), 599; https://doi.org/10.3390/sym18040599 - 31 Mar 2026
Viewed by 216
Abstract
This paper develops a symmetry-oriented regime-level framework for resonant DC-AC inverters that extends classical source duality toward a multidimensional representation of inverter operation. The proposed formulation introduces a compact inverter signature vector and associated symmetry operators to organize source-domain, detuning side, commutation, switch-path, [...] Read more.
This paper develops a symmetry-oriented regime-level framework for resonant DC-AC inverters that extends classical source duality toward a multidimensional representation of inverter operation. The proposed formulation introduces a compact inverter signature vector and associated symmetry operators to organize source-domain, detuning side, commutation, switch-path, and modal correspondences within a unified hierarchy. On this basis, a symmetry-guided workflow is defined using compact screening metrics for stress/circulation balance, phase displacement, and commutation feasibility, enabling early-stage comparison of operating regimes before topology-specific detailed design closure. The framework is demonstrated through an extended-duality pairing of two resonant DC-AC inverter regimes: an open-input super-resonant ZVS-like corridor and a closed-input sub-resonant ZCS-like corridor. The case studies show how the proposed regime signatures and screening metrics support structured reasoning about soft-switching corridors, stress redistribution, and device-class-dependent implications, including wide-bandgap (WBG) design tendencies. The proposed metrics are intended as low-order screening indicators and regime-selection tools rather than substitutes for detailed circuit, thermal, EMI, and device-level validation. Within this scope, the paper contributes an operational symmetry formalism that links duality-based interpretation to practical early-stage design organization and robustness-oriented comparison. Full article
(This article belongs to the Special Issue Advances in Intelligent Power Electronics with Symmetry/Asymmetry)
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37 pages, 16828 KB  
Article
An Enhanced Polar Lights Optimization Algorithm with Symmetry Mechanisms for Global Optimization and Its Application to Wind Power Forecasting
by Xinxing Hou, Yanwen Li and Zhenzhong Liu
Symmetry 2026, 18(1), 61; https://doi.org/10.3390/sym18010061 - 29 Dec 2025
Cited by 2 | Viewed by 350
Abstract
Optimization problems in high-dimensional, nonlinear, and multimodal scenarios remain challenging for conventional methods. Although metaheuristic algorithms have shown strong adaptability, many still suffer from premature convergence, inefficient boundary handling, insufficient population diversity, and a lack of effective symmetry exploitation in the search space. [...] Read more.
Optimization problems in high-dimensional, nonlinear, and multimodal scenarios remain challenging for conventional methods. Although metaheuristic algorithms have shown strong adaptability, many still suffer from premature convergence, inefficient boundary handling, insufficient population diversity, and a lack of effective symmetry exploitation in the search space. To address these limitations, this paper proposes an Enhanced Polar Lights Optimization (EPLO) algorithm, which extends the recently developed Polar Lights Optimization (PLO) method by incorporating symmetry-aware optimization mechanisms. EPLO integrates three complementary strategies—an elite-guided strategy, a global-best-informed boundary control strategy, and a hybrid crossover strategy—forming a unified “Guidance–Constraint–Innovation” optimization mechanism that leverages symmetry to balance exploration and exploitation. Specifically, elite guidance improves search directionality and convergence speed, symmetry-informed boundary control enhances solution validity and stability, and hybrid crossover preserves population diversity by maintaining symmetric and diverse solution distributions. The performance of EPLO is comprehensively evaluated on the CEC2017 and CEC2022 benchmark suites and compared with nine representative metaheuristic algorithms. Statistical analyses using Wilcoxon rank-sum and Friedman tests confirm the superior convergence speed, robustness, and solution quality of EPLO. Furthermore, to demonstrate its practical applicability, EPLO is combined with a BP neural network and applied to a wind power forecasting task, where symmetry-enhanced optimization contributes to improved predictive accuracy. The results validate EPLO as an effective and robust optimization algorithm with strong potential for both benchmark problems and real-world applications. Full article
(This article belongs to the Special Issue Advances in Intelligent Power Electronics with Symmetry/Asymmetry)
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22 pages, 3277 KB  
Article
Power Oscillation Emergency Support Strategy for Wind Power Clusters Based on Doubly Fed Variable-Speed Pumped Storage Power Support
by Weidong Chen and Jianyuan Xu
Symmetry 2025, 17(6), 964; https://doi.org/10.3390/sym17060964 - 17 Jun 2025
Cited by 1 | Viewed by 884
Abstract
Single-phase short-circuit faults are severe asymmetrical fault modes in high renewable energy power systems. They can easily cause large-scale renewable energy to enter the low-voltage ride-through (LVRT) state. When such symmetrical or asymmetrical faults occur in the transmission channels of high-proportion wind power [...] Read more.
Single-phase short-circuit faults are severe asymmetrical fault modes in high renewable energy power systems. They can easily cause large-scale renewable energy to enter the low-voltage ride-through (LVRT) state. When such symmetrical or asymmetrical faults occur in the transmission channels of high-proportion wind power clusters, they may trigger the tripping of thermal power units and a transient voltage drop in most wind turbines in the high-proportion wind power area. This causes an instantaneous active power deficiency and poses a low-frequency oscillation risk. To address the deficiencies of wind turbine units in fault ride-through (FRT) and active frequency regulation capabilities, a power emergency support scheme for wind power clusters based on doubly fed variable-speed pumped storage dynamic excitation is proposed. A dual-channel energy control model for variable-speed pumped storage units is established via AC excitation control. This model provides inertia support and FRT energy simultaneously through AC excitation control of variable-speed pumped storage units. Considering the transient stability of the power network in the wind power cluster transmission system, this scheme prioritizes offering dynamic reactive power to support voltage recovery and suppresses power oscillations caused by power deficiency during LVRT. The electromagnetic torque completed the power regulation within 0.4 s. Finally, the effectiveness of the proposed strategy is verified through modeling and analysis based on the actual power network of a certain region in Northeast China. Full article
(This article belongs to the Special Issue Advances in Intelligent Power Electronics with Symmetry/Asymmetry)
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