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11th Frontier Academic Forum of electrical engineering, FAFEE 2024

作者： Xu, Jiacheng Chen, Yandong Xie, Zhiwei Li, Xuyang Zhao, Chen National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha410082 China

ISBN: (纸本)9789819788194

In order to solve the problem that the traditional Grid-Following (GFL) grid-connected inverter is prone to oscillation and instability under weak grid, a grid-following virtual synchronous mechanism construction and voltage feedforward control method based on the swing equation of the synchronizer are proposed. Firstly, the method refers to the Virtual Synchronous Generators (VSG) technology to derive and reconstruct the swing equation of the synchronous machine, and proposes a new voltage feedforward controller, which introduces inertia and damping to the control of the GFL inverter and improves the stability of the GFL inverter under the weak power grid. Then, the proposed control method is theoretically analyzed and optimized by establishing the frequency-coupling sequence admittance model, and the results show that the proposed method can significantly improve the negative resistance characteristics of the inverter in the middle and low frequency bands to enhance the stability of the GFL grid-connected inverter under the weak grid. Finally, this paper verifies that the proposed control method can operate stably in weak and very weak grids, as well as in strong power grids, which is of great significance for improving the adaptability and reliability of GFL grid-connected inverters in complex grid conditions. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Feedforward control

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Anti-Offset Wireless power Transfer System Based on Variable Inductor 11th

Anti-Offset Wireless Power Transfer System Based on Variable...

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11th Frontier Academic Forum of electrical engineering, FAFEE 2024

作者： Qu, Sizhuo Chen, Yandong Luo, Cong Xie, Jiawei Wu, Longbang National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha410082 China

ISBN: (纸本)9789819788194

In recent years, wireless power transfer has been widely studied for its advantages of safety, convenience and intelligence. However, in the actual working scene, the horizontal or vertical offset of the receiving coil may cause a large fluctuation in the output voltage of the system, which seriously affects the life of the load, and the surge of the primary side current leads to the heating of the switch and even the overcurrent of the device. Therefore, this paper proposes an anti-offset control strategy based on adjusting the variable inductor to compensate for the surge of the primary side current and the fluctuation of the output voltage caused by the coil offset. In this paper, a detuned series-series anti-offset wireless power transfer system with variable inductor added to the secondary side is designed. The variable inductor is adjusted by changing the permeability of the variable inductor. Based on the adjustment of the variable inductor, the output voltage is constant when the coil is offset and the primary side current is reduced. The control strategy does not require wireless communication. Finally, a 600 W wireless power transfer system with stable output voltage of 72 V is built. The experimental results show that the tolerance range of the system in the horizontal direction is 0–12 cm, and the tolerance range in the vertical direction is 5–11 cm, and the current of the transmitting coil is reduced when the coil is offset. The system improves the freedom and stability of the wireless power transfer system. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Inductive power transmission

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control and Design of a Novel Dual Multiplexing Soft Open Point with Small Volume

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IEEE Transactions on power Electronics 2025年第8期40卷 10988-11000页

作者： Chen, Yutong Chen, Wu Zhao, Haixi Hao, Zewei Lan, Jianxi Wang, Xuze Li, Xin Sha, Runyan Wang, Jiangfeng Jiang, Wei Yuan, Yubo Southeast University Center for Advanced Power Conversion Technology and Equipment School of Electrical Engineering Nanjing210096 China State Grid Jiangsu Electric Power Company Ltd. Research Institute Nanjing211103 China

The soft open point (SOP) technology enables flexible power regulation in distribution networks, making it a critical tool for grid modernization. However, existing SOP topologies face challenges such as the need for numerous submodules and low efficiency. This paper addresses the flexible interconnection of 10 kV medium-voltage distribution networks by proposing a compact topology called dual multiplexing soft open point (DM-SOP), based on high-voltage SiC MOSFETs. The DM-SOP topology exhibits modular characteristics and enables decoupled power control between two feeders. It offers advantages over traditional SOP topologies, including a reduced footprint, fewer switches and high efficiency. This paper presents the novel DM-SOP topology, its operational principles, control strategies, and operational ranges. Finally, through feeder interconnection simulations and the construction of a 1.5 kW low-power prototype for experimental validation, the feasibility of the DM-SOP topology, as well as the effectiveness of the control and energy balancing strategies, are confirmed. © 1986-2012 IEEE.

关键词： power distribution networks

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research on Low-Temperature Pull and Deflection Characteristics of Aerospace power Supply 11th

Research on Low-Temperature Pull and Deflection Characterist...

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11th Frontier Academic Forum of electrical engineering, FAFEE 2024

作者： Zhang, Yuhuan Liu, Mi Guo, Chuanwei Ma, Tao zhao, Chuang Li, Xinxin Chen, Yonggang Li, Yan Beijing Spacecrafts Beijing100094 China Beijing Space Power Conversion and Control Engineering and Technology Research Center Beijing100094 China

ISBN: (纸本)9789819788316

Deep space exploration is an important field of space exploration and astronautical activities in today's world, which is of great significance to the development of human civilization. Aerospace power supply system is an important part of the power supply system for deep space exploration, so research on its low-temperature pull and deflection characteristics is particularly important. In this paper, the low-temperature pull-off characteristics of the Aerospace power Supply are verified and enhanced. Firstly, the application circuit of VDMOS, which is the core component of aerospace power supply, is analyzed, and two different working modes, namely, single switching application and high frequency switching application, are summarized. Secondly, the low-temperature pull-off test of aerospace power supply is carried out to compare and analyze with the normal temperature pull-off test to identify the reasons for poor low-temperature pull-off characteristics.. Finally, the low-temperature pull-off control link is analyzed, and the solution is given and verified through the test, which improves the low-temperature pull-off characteristics of the astronautical power supply, and contributes to the development of high reliability of the power supply system for deep space exploration. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Space research

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Dynamic evolution of CO2 hydrogenation to methanol over Cu catalysts based on ReaxFF MD simulations

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International Journal of Hydrogen Energy 2025年 136卷 102-114页

作者： Dong, Meirong Huang, Zehua Xiong, Junchang Liu, Hongchuan Liang, Youcai Lu, Jidong School of Electric Power Engineering South China University of Technology Guangdong Guangzhou510640 China Guangdong Province Engineering Research Center of High Efficient and Low Pollution Energy Conversion Guangdong Guangzhou510640 China

It is essential to identify key intermediates for elucidating the reaction mechanism by studying the dynamic evolution of the reaction process. In the synthesis of methanol by CO2 hydrogenation, the formation of by-products CO and H2O affects the selective generation of methanol. In this work, reactive force field molecular dynamics (ReaxFF MD) simulations were proposed to simulate the CO2 hydrogenation reaction on Cu surface. The CO2/H2, CO2/CO/H2 and CO2/H2O/H2 systems were analyzed sequentially in order to explore the dynamic properties of the key intermediate product generation and to elucidate the detailed reaction pathways and their kinetic effects. The results showed that in the CO2/H2 system, there are three different pathways for the methanol production, while two main pathways were found for CO hydrogenation. The synergistic effect between CO2 and CO hydrogenation was demonstrated in the CO2/CO co-hydrogenation to methanol, and the introduction of CO further improved the methanol selectivity. However, in the CO/H2 system, excessive CO adsorption leads to severe C deposition, catalyst deactivation, and reduced methanol yield. Conversely, the incorporation of H2O into the CO2/H2 system was shown to inhibit the C deposition on the Cu catalyst, maintain the catalytic activity, and enhance the methanol selectivity by introducing the methoxy hydrolysis pathway (CH3O + H2O → CH3OH + HO). It is worth noting that the simulations revealed previously unrecognized CH pathways (CO2 → CH → CH → CHO → CH2O → CH3O → CH3OH) and methoxy hydrolysis pathways. The proposed route to synthesize methanol over Cu catalysts not only provides novel insights into methanol synthesis, but also provides the necessary theoretical support for understanding the reaction mechanism of CO2 hydrogenation to methanol. © 2025

关键词： Reaction intermediates

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Resilient Cooperative control of Multiple DC Microgrids With Interconnection Networks Against Cyber Attacks

IEEE Transactions on Industrial Cyber-Physical Systems

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IEEE Transactions on Industrial Cyber-Physical Systems 2025年 3卷 116-126页

作者： Xiao, Feng Liu, Shiyu Wei, Bo Fang, Fang Qin, Jiahu North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing102206 China North China Electric Power University School of Control and Computer Engineering Beijing102206 China North China Electric Power University New Energy Generation National Engineering Research Center Beijing102206 China University of Science and Technology of China Department of Automation Hefei230027 China

The two control objectives of voltage regulation and precise current sharing are conflicting in multi-bus DC microgrids. In this paper, a distributed control strategy is proposed, and it can achieve accurate current sharing and regulate the voltage of a critical node to the rated value. However, such a distributed control system is susceptible to potential cyber attacks that could deteriorate microgrids performances by corrupting communication links or actuators. To overcome these difficulties, we design the interconnected communication networks to establish a resilient cooperative system of multiple microgrids against unknown bounded injection attacks. The proposed resilient control strategy can achieve the control objectives of maintaining voltage regulation and current sharing within each microgrids under different operating conditions, and the interconnected system consisting of multiple microgrids cooperates to mitigate the adverse effect of cyber attacks. The dynamics and stability of the overall close-loop system of the DC microgrids are analyzed, in the present or absent of cyber attacks. Simulation results validate the effectiveness of the proposed approach in two 4-bus DC microgrids. © 2023 IEEE.

关键词： Cyber attacks

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Analysis of the safe operation region of grid-connected converters under time-varying operating point conditions

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International Journal of electrical power and Energy Systems 2025年 169卷

作者： Xie, Weijie Xiao, Fan Zheng, Yuting Kuang, Guochen Tu, Chunming Long, Liu Guo, Qi National Electric Power Conversion Control Engineering Technology Research Centre Hunan University Changsha410082 China

Plenty of engineering operation experience indicates that the performance of grid-connected converters (GCCs) undergoes a transformation in response to alterations in operating points. The operating points of the GCCs are closely related to several factors such as the volatility of new energy and the random switching of loads, therefore exhibit time-varying characteristics. While traditional impedance/admittance analysis methods are effective in analysing the stability of GCCs at fixed operating points, they become inefficient for systems with time-varying conditions due to the requirement of repeat analyses across multiple operating points. This process becomes particularly time-consuming for systems with numerous potential operating points, ultimately failing to capture the system's behavior over its entire operating range. Therefore, the current research gap lies in the inability to effectively and comprehensively analyse GCC stability under time-varying conditions, which is a common feature of highly renewable energy integrated systems. This gap is critical because such fluctuations are highly relevant to renewable energy generation systems and can significant impact on GCC stability, and the lack of effective analysis methods may lead to underperform or even failure of these systems. To address this, this paper proposes a unified SISO model that embeded operating point variables directly into the small-signal analysis of GCCs. This approach enables stability analysis across the entire operating range of GCCs without redundant evaluations. Additionally, the proposed method integrates the advantages of the multivariate approach with an intuitive representation of stability based on the safe operating region (SOR), offering an efficient, accurate, and practical method for assessing stability in realistic time-varying environments, which has been challenging in previous research. A 1.7 kW/60 V experimental prototype is constructed to experimentally validate the acc

关键词： Time varying systems

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Temperature control Performance and Cooling Release Characteristics of PCM in Large Space:Case Study of Cold Storage

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Energy engineering 2025年第3期122卷 885-903页

作者： Zhengrong Shi Hai Hong Yanming Shen Jingyong Cai College of Energy and Mechanical Engineering Shanghai University of Electric PowerShanghai201306China Research and Development Center Heatmate New Energy Technology Co.Ltd.Shanghai200090China Shanghai Non-Carbon Energy Conversion and Utilization Institute Shanghai Jiao Tong UniversityShanghai200240China

Phase Change Material(PCM)-based cold energy storage system(CESS)can effectively utilize the peak and valley power resources to reduce the excessive dependence on the power *** this study,a PCM-based CESS was designed for cold storage *** optimal number of PCM plates was determined through numerical simulations to meet the required cold storage temperature and control ***,the air temperature field,flow field,and melting characteristics of the PCMplates during the cooling release process were *** effects of plate positioning and thickness on the cooling release performance were further *** results indicated that when 64PCMplateswere used,the duration formaintaining temperatures below−18℃increased from0.6 h to approximately 16.94 *** the cooling release process,the temperature field in the cold storage exhibited stratification,and the melting of the PCM plates was *** the PCM plates at the top or within the interlayers without cargo above proved more effective,with their cooling release power being approximately twice that of the PCM plates placed in the interlayers with cargo ***,reducing the thickness of the PCMplates from15 to 7.5mmresulted in a 3.6-h increase in the time below−18℃and a 4.5-h reduction in the time required to reach 80%liquid phase fraction.

关键词： Cold storage cold energy storage system PCM plates cooling release characteristics

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Transferable Attention-distracting Adversarial Attack on Data-driven Models for power Systems

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IEEE Transactions on Information Forensics and Security 2025年 20卷 4985-4998页

作者： Huang, Rong Li, Yuancheng Yin, Peidong Shang, Xingyu Wang, Yuanyuan North China Electric Power University School of Control and Computer Engineering Beijing102206 China China Telecom Research Institute Beijing102209 China National Computer Network Emergency Response Technical Team Coordination Center Beijing100029 China

As the digitalization of power systems progresses, data-driven models have garnered widespread attention due to their performance advantages, leading to the emergence of numerous data-driven intelligent models for power tasks, such as attack detection and stability assessment. However, data-driven models are susceptible to adversarial attacks, even when deployed in highly secure control centers. Considering the similarity in the semantic features extracted by structurally diverse data-driven models when addressing the same downstream tasks, this paper proposes a transferable attention-distracting adversarial attack tailored for power systems. This attack first introduces an adversarial perturbation selection framework with physical constraints specific to power systems. It also offers different loss functions to distract attention and strategies to weaken the significance of features. Simulation experiments confirm that distracting the model’s attention results in more stable transferable attack effects and significantly reduces the performance of data-driven models across different task scenarios. The experimental results underscore the importance of not neglecting the security and robustness of models in security-critical scenarios like power systems, even while achieving optimal performance. © 2005-2012 IEEE.

关键词： Access control models

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An Effective Mesh Optimization Strategy for Oil Immersed Transformer Thermal Fluid Field Calculation 11th

An Effective Mesh Optimization Strategy for Oil Immersed Tra...

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11th Frontier Academic Forum of electrical engineering, FAFEE 2024

作者： Zhang, Lei Li, Rui Chen, Liangyuan Sun, Zhiyuan Electric Power Research Institute of Guangxi Power Grid Co. Ltd Guangxi Nanning530023 China Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Guangxi Nanning530023 China Guangxi Power Grid Equipment Monitoring and Diagnosis Engineering Technology Research Center Guangxi Nanning530023 China

ISBN: (纸本)9789819788279

A transformer thermal fluid field mesh optimization generation method based on the calculation results difference feedback is proposed. The number of meshes obtained by the local mesh refinement optimization based on the difference distribution feedback of results is 1.972 million, which is reduced to 72.7% of the number of meshes obtained based on the global refinement method. A temperature rise test platform is built in which the windings have embedded optical fiber temperature measurement system, and based on the test results under rated condition, the absolute errors between the calculated hot spots of HV and LV windings and the test values are 0.81% and 0.40%, respectively, which verify the effectiveness of the method. The thermal fluid field calculation mesh optimization generation method can reduce the number of calculation meshes while ensuring the calculation accuracy, and can provide a reference for mesh optimization control in transformer thermal fluid field calculation. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Mesh generation

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