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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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Identification Modeling of Frequency-Coupling Admittance for Grid-Connected Inverter Under All Operating Conditions 6

Identification Modeling of Frequency-Coupling Admittance for...

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6th IEEE International electrical and Energy Conference, CIEEC 2023

作者： Zhang, Zilin Wu, Wenhua Xie, Zhiwei Chen, Yandong Cao, Shixiang Luo, Cong National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha China

ISBN: (纸本)9798350346671

The control structure and parameters of the grid-connected inverter in actual projects are usually unknown, which results in the 'black-box' phenomenon. The traditional impedance modeling method is not suitable for the black-box. In this paper, a black-box identification method for the admittance of grid-connected inverters under all operating conditions considering frequency-coupling is proposed. Firstly, accurate discrete admittance data are acquired by the frequency-coupling admittance measurement. Then, the vector fitting (VF) is applied to identify the frequency-coupling admittance under a single operating condition. The black-box models identified by VF are combined with the weighting function to obtain the black-box admittance model of the grid-connected inverter under all operating conditions. Finally, the effectiveness and accuracy of the method are verified via MATLAB/Simulink. The results show that the method introduced in this paper not only can obtain the black-box admittance model under all operating conditions simply through several groups of admittance data, but also has the advantages of efficiency and high accuracy. © 2023 IEEE.

关键词： electric inverters

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Understanding the boundary and mechanism of gas-induced explosion for lithium-ion cells:Experimental and theoretical analysis

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Journal of Energy Chemistry 2023年第11期86卷 546-558,I0012页

作者： Tongxin Shan Xiaoqing Zhu Zhenpo Wang National Engineering Research Center of Electric Vehicles Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China

Thermal runaway(TR)of lithium-ion(Li-ion)batteries(LIBs)involves multiple forms of hazards,such as gas venting/jetting,fire,or even ***,as the most extreme case,is caused by the generated flammable gases,and a deflagration to detonation transition(DDT)may occur in this ***,overheat-to-TR tests and the corresponding outgas-induced explosion tests were conducted on 42 Ah Li-ion cells with Li[Ni_(1/3)Co_(1/3)Mn_(1/3)]*** sum of CO_(2),H_(2),C_(2)H_(4),CO,and CH4accounted for more than 90%of the ***/upper explosion limits(LEL/UEL),laminar flame speed,and ideal stable detonation pressure were calculated to interpret the explosion characteristics and *** turned out that shockwave was easily to be compressed and accelerated under higher state of charge(SOC)***,Li-ion cells explosion may evolve into unstable detonation in encapsulated battery pack and its evolution mechanism was explained,which provides a new idea for explosion-proof design of LIBs ***,a comprehensive assessment method was developed to intuitively characterize TR *** of explosion presented an upward trend with the increase of SOC while the sensitivity was not the *** study provides a further anatomy of TR,which is instructive to the safety of power battery systems.

关键词： Lithium-ion battery Thermal runaway Gas explosion Evolution mechanism Safety

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Interactive power Oscillation and Its Suppression Strategy for VSG-DSG Paralleled System in Islanded Microgrid

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Chinese Journal of electrical engineering 2022年第4期8卷 113-124页

作者： Zhiyong Yuan Xia Shen Yingjie Tan Zhenhua Tan Jinyong Lei Electric Power Research Institute CSGGuangzhou 510663China National Electrical Energy Conversion and Control Engineering Technology Research Center Hunan UniversityChangsha 410082China

A virtual synchronous generator(VSG)can provide inertial support through renewables and energy *** generally operates in parallel with a diesel generator(DSG)in an islanded ***,unforeseen interactive power oscillations occur in the paralleled system when loads *** may also burn out the VSG owing to its low overcurrent *** mechanism and suppression strategy of the power oscillation of a VSG-DSG paralleled system are *** reveals that the interactive power oscillation is caused essentially by the physical difference and parameter mismatch between the VSG and ***,the elimination condition of oscillation generation is ***,a comprehensive suppression control strategy based on virtual inductance and dynamic mutual damping technology is ***,the experimental results verify the effectiveness of the proposed method.

关键词： Islanded microgrid VSG-DSG paralleled system oscillation mechanism virtual inductance dynamic mutual damping suppression strategy

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Process and Protection Action of Commissioning Fault of Offshore Wind Farm Grid-Connected Transmission Lines

Process and Protection Action of Commissioning Fault of Offs...

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2023 IEEE International Conference on Advanced power System Automation and Protection, APAP 2023

作者： Yan, Yabing Chu, Xu Liu, Qi Li, Hui Xu, Liqiang Electric Power Research Institute State Grid Hunan Electric Power Company Limited Changsha China Hunan University National Electric Power Conversion and Control Engineering Technology Research Center Changsha China

ISBN: (纸本)9798350306668

The fault analysis of the grid-connected system of offshore wind farm and the design of protection and control schemes to cope with faults have always been hot research issues. Most of the existing research conclusions rely on simulation models to verify their effectiveness, and there are unavoidable errors between simplified models of large-scale wind farms and actual offshore wind projects. In order to restore the real situation of the grid-connected system fault of offshore wind farm to the greatest extent, this paper studies the real case of an offshore wind farm grid-connected transmission lines fault during commissioning. In this paper, transient characteristics of each component in three stages of charging stage, system fault stage and system disruption stage are analyzed, and the action behavior of the system configuration protection during the accident is evaluated, and the actual recording data of the accident verify the effectiveness of the theoretical analysis. © 2023 IEEE.

关键词： Offshore wind farms

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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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Enhanced AC Fault Ride-through control for MMC-integrated System Based on Active PCC Voltage Drop

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Journal of Modern power Systems and Clean Energy 2023年第4期11卷 1316-1330页

作者： Haihan Ye Wu Chen Heng Wu Wu Cao Guoqing He Guanghui Li Center for Advanced Power Conversion Technology and Equipment School of Electrical EngineeringSoutheast UniversityNanjing 210096China Department of Energy Technology Aalborg University9220 AalborgDenmark China Electric Power Research Institute Beijing 100192China

When a renewable energy station(RES)connects to the rectifier station(RS)of a modular multilevel converterbased high-voltage direct current(MMC-HVDC)system,the voltage at the point of common coupling(PCC)is determined by RS control *** example,RS control may become saturated under fault,and causes the RS to change from an equivalent voltage source to an equivalent current source,making fault analysis more *** addition,the grid code of the fault ride-through(FRT)requires the RES to output current according to its terminal *** changes the fault point voltage and leads to RES voltage regulation and current redistribution,resulting in fault response *** address these issues,this study describes how an MMC-integrated system has five operation modes and three common characteristics under the duration of the *** study also reveals several instances of RS performance degradation such as AC voltage loop saturation,and shows that RS power reversal can be significantly *** enhanced AC FRT control method is proposed to achieve controllable PCC voltage and continuous power transmission by actively reducing the PCC voltage *** robustness of the method is theoretically proven under parameter variation and operation mode ***,the feasibility of the proposed method is verified through MATLAB/Simulink results.

关键词： Modular multilevel converter-based high-voltage direct current(MMC-HVDC)system fault ride-through(FRT) voltage loop saturation continuous power transmission point of common coupling(PCC) active voltage drop control

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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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A Load-Current Feed-Forward control Method of TAB with Fast Regulation Ability 16th

A Load-Current Feed-Forward Control Method of TAB with Fast ...

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16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Tu, Chunming Yuan, Shuyuan Xiao, Fan Liu, Bei Yu, Xueping Guo, Qi Liu, Jie National Electric Power Conversion Control Engineering Technology Research Center Hunan University Changsha410082 China

ISBN: (纸本)9789811915314

Aiming at the problems of large output voltage overshoot and long adjustment time caused by port power coupling during the dynamic power regulation process of Triple Active Bridge (TAB) converter under the load switching application, this paper proposes a load-current feed-forward control method based on decoupling network, which has the advantages of faster dynamic response and higher control precision. Firstly, the power transmission characteristics between ports of TAB converter are analyzed. The power coupling characteristics between ports are analyzed by establishing the load current small signal model, and the diagonal decoupling network matrix is derived. Then the decoupling matrix is added to the load-current feed-forward control loop, and the load-current feed-forward controller based on the decoupling network is designed. The stability of the control strategy is analyzed by transfer function and Bode diagram. Finally, the simulation model of TAB converter is built in Matlab/Simulink simulation environment, and the correctness and effectiveness of the control strategy proposed in this paper are verified by simulation. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Bode diagrams

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