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Modulation and Voltage Balancing Control of Dual Five-level ANPC Inverter for ship Electric Propulsion systems

Chinese Journal of Electrical Engineering 2021年第4期7卷 78-92页

作者： Xiaohui Xu Xingchi Song Kui Wang Nianzhou Liu Wenfeng Long Zedong Zheng Yongdong Li Science and Technology on Ship Integrated Power System Technology Laboratory Wuhan Institute of Marine Electric PropulsionWuhan 430070China China State Key Laboratory of Power System Tsinghua UniversityBeijing 100084China

Open-end winding motors are used extensively in ship electric propulsion systems,in which medium-voltage high-power inverters are a critical *** increase the system voltage and power density,a dual five-level active neutral-point clamped(ANPC)inverter is proposed herein to drive medium-voltage open-end winding motors for ship electric *** phase of this inverter comprises two five-level ANPC bridges and all the phases are powered by a common direct-current link.A hybrid modulation method is proposed to control this *** series-connected switches in all the five-level ANPC bridges are operated at the fundamental frequency,and the other switches are controlled with a phase-shifted pulse-width modulation(PWM),which can achieve a natural balance between the neutral-point voltage and flying capacitor voltages in a carrier period.A closed-loop capacitor voltage balancing method based on adjusting the duty ratios of the PWM signals is *** neutral-point voltage and flying capacitor voltages can be controlled independently and balanced without affecting the output phase *** and experimental results are presented to demonstrate the validity of this method.

关键词： Multilevel inverter active neutral-point clamped(ANPC) capacitor voltage balance open-end winding motor drive

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Precise methods for conducted EMI modeling,analysis,and prediction

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science China(Technological sciences) 2008年第6期51卷 641-655页

作者： MA WeiMing ZHAO ZhiHua MENG Jin PAN QiJun ZHANG Lei National Key Laboratory for Ship Integrated Power System Technology Naval University of EngineeringWuhan 430033China

Focusing on the state-of-the-art conducted EMI prediction, this paper presents a noise source lumped circuit modeling and identification method, an EMI modeling method based on multiple slope approximation of switching transitions, and dou-ble Fourier integral method modeling PWM conversion units to achieve an accurate modeling of EMI noise source. Meanwhile, a new sensitivity analysis method, a general coupling model for steel ground loops, and a partial element equivalent circuit method are proposed to identify and characterize conducted EMI coupling paths. The EMI noise and propagation modeling provide an accurate prediction of conducted EMI in the entire frequency range (0―10 MHz) with good practicability and generality. Finally a new measurement approach is presented to identify the surface current of large dimensional metal shell. The proposed analytical modeling methodology is verified by experimental results.

关键词： EMC conducted EMI modeling and prediction sensitivity ground impedance

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Synchronous Optimal Pulse-Width Modulation Method for Three-Phase Five-Level NPC-H Bridge Inverter 4

Synchronous Optimal Pulse-Width Modulation Method for Three-...

引用

4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Fang, Huasong Qiu, Changqing Wang, Dingquan Science and Technology on Ship Integrated Power System Technology Laboratory Wuhan China

ISBN: (纸本)9781728171494

A synchronous optimized pulse width modulation method for a three-phase five-level NPC-H bridge inverter is proposed for the problem that the larger the inverter output common-mode voltage amplitude is, the larger the system conduction loss and the worse the electromagnetic compatibility. A mathematical model is constructed based on the inverter output current, weighted common-mode voltage, etc. as a whole. The optimal switching angle value is solved by minimizing a specific function, and the corresponding PWM signal is generated according to the NPC-H bridge inverter control. Simulations show that this method can effectively solve the problems of large harmonic current and high common mode voltage amplitude at low switching frequency of five-level NPC-H bridge inverter output while maintaining the self-balancing characteristic of voltage at the neutral-point of DC bus. © 2021 IEEE.

关键词： Pulse width modulation

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A New SPWM Strategy for Five-Level ANPC Converters 4

A New SPWM Strategy for Five-Level ANPC Converters

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Wang, Dingquan Qiu, Changqing Shao, Junbo Xie, Pengfei Science and Technology on Ship Integrated Power System Technology Laboratory Wuhan China

ISBN: (纸本)9781728171494

The five-level active neutral-point clamped (5L- ANPC) converter has the advantages of large output power, small number of floating capacitors, and only one midpoint of the bus. In recent years, it has received extensive attention from scholars. However, the existing modulation strategies still have some drawbacks. For sinusoidal pulse width modulation (SPWM), the DC side voltage utilization is low and the calculation of the NP potential balance control is complicated. For space vector pulse width modulation (SVPWM), the digital implementation is difficult. This paper proposes a new SPWM strategy for 5L-ANPC converters based on the essential connection between SVPWM and SPWM. This strategy first equates SVPWM to SPWM, and then achieves free selection of switching sequence by injecting zero-sequence voltage. It can effectively suppress NP potential fluctuations, and achieve NP potential balance. According to the voltage offset of the floating capacitor, the equivalent PD-SPWM type is adjusted in real time to realize the control and balance of the voltage of the floating capacitor. This strategy is an optimized modulation algorithm with high degrees of freedom, high DC voltage utilization, and it is very easy to implement digitally. © 2021 IEEE.

关键词： Vector spaces

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Analysis and Experimental Validation of a New Topology of Parallel Hybrid Excitation Machine 4

Analysis and Experimental Validation of a New Topology of Pa...

引用

4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Liu, Yang Yang, Gao Xu, Xiaohui Xie, Siyuan Zong, Yun Science and Technology on Ship Integrated Power System Technology Laboratory Wuhan430074 China

ISBN: (纸本)9781728171494

In this paper, a new topology of parallel hybrid excitation machine (PHEM) with rated power of 500kW is proposed and analyzed. The proposed PHEM axially combines a permanent magnet synchronous machine (PMSM) with a brushless field excitation machine (BFEM), thus inheriting the advantages of the two machines, i.e. the high power density of PMSM and the field-regulating capability of BFEM. First, the configuration and operation principle of the PHEM are analyzed. Then, the performances, including no-load, rated-load and short-circuit fault, of the first axial part (i.e. the PMSM) and the second axial part (i.e. the BFEM) are investigated by 2D and 3D finite element analysis (FEA), respectively. Also, the overall performances of the PHEM are predicted and analyzed. Finally, a prototype of the 500kW PHEM is built and tested. The experimental results have verified the theoretical analyses of the PHEM. © 2021 IEEE.

关键词： Permanent magnets

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Delamination failure analysis of G10 insulator in electromagnetic rail launcher

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High Voltage 2023年第5期8卷 889-897页

作者： Xinkai Hu Junyong Lu Sai Tan Bai Li Jiawei Zhang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhanHubeiChina

The electromagnetic(EM)rail launcher G10 insulator is prone to delamination damage during launch,which affects the service life of the *** the secondary development of ABAQUS®commercial finite‐element software,an EM‐structure coupling launch dynamics model considering projectile‐barrel coupling is *** simulation indicates that the transverse swing of the projectile changes in a sine‐like law,and the time of the upper half wave corresponds to the pulse width of the impact force pulse *** stress concentration occurs on the inner surface of the insulator where the contact‐impact occurs,resulting in impact *** midline of the insulator inner surface bears a large compressive strain under the action of pre‐tightening force,and the insulator is compressed oscillatingly under the influence of the timevarying load of the rail during *** the condition of repeated launch,the launch package repeatedly impacts the insulator,and the alternating load of the rail is cyclically loaded on the insulator with impact damage,which will cause the compression fatigue of the insulator and the expansion of impact damage *** are the main reasons for the delamination failure of insulator,and the experimental analysis is carried *** study provides a method to study the delamination failure mechanism of the insulator,and provides guidance for improving the life of the insulator.

关键词： insulator damage analysis

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Dynamic State Estimation of Medium-voltage DC integrated power system with Pulse Load

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Journal of Modern power systems and Clean Energy 2020年第4期8卷 689-698页

作者： Runlong Xiao Gang Wang Xiaoliang Hao Renji Huang Youxing Xiong National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan 430033China

The dynamic characteristic evaluation is an important prerequisite for safe and reliable operation of the mediumvoltage DC integrated power system(MIPS),and the dynamic state estimation is an essential technical approach to the *** the electromechanical transient process in a traditional power system,periodic change in pulse load of the MIPS is an electromagnetic transient *** the system state suddenly changes in the range of a smaller time constant,it is difficult to estimate the dynamic state due to periodic *** paper presents a dynamic mathematical model of the MIPS according to the network structure and control strategy,thereby overcoming the restrictions of algebraic variables on the estimation and developing a dynamic state estimation method based on the extended Kalman *** the method of adding fictitious process noise,it is possible to solve the problem that the linearized algorithm of the MIPS model is less reliable when an abrupt change occurs in the pulse ***,the accuracy of the dynamic state estimation and the stability of the filter can be improved under the periodic disturbance of pulse *** simulation and experimental results confirm that the proposed model and method are feasible and effective.

关键词： Medium-voltage DC integrated power system pulse load dynamic state estimation extended Kalman filter fictitious process noise

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3D printing of high-performance micro-supercapacitors with patterned exfoliated graphene/carbon nanotube/silver nanowire electrodes

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science China(Technological sciences) 2021年第5期64卷 1065-1073页

作者： LIU Lang LU JunYong LONG XinLin ZHOU Ren LIU YingQuan WU YiTing YAN KangWei National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan 430033China

Micro-supercapacitors(MSCs)show great potential as on-chip energy storage devices for portable *** major flaw of thin-film MSCs is their low energy *** improve the energy density,thicker electrodes are ***,the fabrication of MSCs with thick electrodes remains a *** this work,a novel 3D printing method is employed to fabricate high-performance MSCs with interdigitated exfoliated graphene(EG)/carbon nanotube(CNT)/silver nanowire(Ag NW)*** nanowelding of Ag NW junction plays a critical role in the realization of 3D *** enhance the electrochemical performances of EG,phosphorus atoms are incorporated into the carbon framework with 1.7 at%.The areal capacitance of the 3D printed MSC is 21.6 mF cm^(-2)at a scan rate of 0.01 V s^(-1).The areal energy density of the MSC ranges from 0.5 to 2μWh cm^(-2)with a maximum power density of 2.5 mW cm^(-2).

关键词： micro-supercapacitor 3D printing silver nanowire exfoliated graphene micro-plasma-jet

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Quaternary Alloy Interfaces for Stable Zinc Anodes for High-Performance Aqueous Zinc-Ion Batteries With Long-Term Cycling Stability

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Small 2025年 e2502569页

作者： Xin, Yan Ge, Yunnian Xie, Huanhuan Cai, Shen Zhao, Chen Zhang, Huai Tian, Huajun Beijing Laboratory of New Energy Storage Technology and Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education School of Energy Power and Mechanical Engineering North China Electric Power University Beijing102206 China Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education School of Chemistry and Materials Science Shanxi Normal University Taiyuan030032 China Center for Integrated Nanostructure Physics Sungkyunkwan University Suwon16419 Korea Republic of Wuhu Churui Intelligent Technology Co. Ltd Wuhu241002 China

Aqueous zinc-ion batteries (AZIBs) have emerged as a promising energy storage solution owing to their intrinsic safety, low cost, environmental friendliness, and high theoretical specific capacity. However, their practical application is hindered by uncontrollable dendrite growth and side reactions at the zinc metal anode. To address these challenges, a simple and cost-effective electrodeposition strategy is proposed to construct a quaternary Zn-Cu-Sn-Bi alloy artificial interface layer on zinc foil (ZCSB@Zn) as the anode of AZIBs. Density functional theory (DFT) calculations and in situ optical dendrite observation confirm that this dense alloy interface layer reduces the migration barrier and weakens hydrogen adsorption, facilitating uniform zinc deposition while effectively suppressing side reactions and dendrite formation. The symmetric ZCSB@Zn cell exhibits extraordinary cycle stability exceeding 8000 h. Furthermore, the assembled ZCSB@Zn//CSB-MnO2 full cell demonstrates a high specific capacity of 199 mAh g−1 at 1 A g−1, maintaining stability even under high loading of 10 mg cm−2 and high temperature conditions (50 °C). This study presents a scalable and cost-effective strategy for constructing quaternary artificial interface layers in zinc metal anodes, highlighting their potential for practical AZIB applications. © 2025 Wiley-VCH GmbH.

关键词： Electrodeposition

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Design and Research of Torque Tube Used in HTS Motor

引用

Wuhan University Journal of Natural sciences 2014年第4期19卷 350-354页

作者： ZHOU Yong SU Hao DAI Yijun CHEN Wei XIE Feng Wuhan Institute of Marine Electric Propulsion CSIC Science an d Technology on Ship Integrated Power System Technology Laboratory

In order to improve the overall performance of high temperature superconducting （HTS） motor, a radial connection torque tube with high strength and low thermal leakage has been designed. Firstly, fiberglass epoxy composite is chosen as con- struction material. The structural size of the torque tube is obtained by means of load analysis and theoretical calculation. Secondly, thermal leakage of the torque tube is calculated with both theo- retical method and 3D finite-element analysis （FEA）. According to the result of the thermal analysis and mechanical loads, the struc- tural stresses of the torque tube are also obtained by FEA method. Lastly, a low temperature test platform is developed to verify the strength and the thermal leakage of the torque tube. The results show that the maximal shear stress of the torque tube is 24.3 MPa and thermal leakage of torque tube is 10.5 W, which satisfy the design requirements of the HTS motor. The torque tube also works in good condition at full-power and full-torque testing of the motor. The design method is also applicable for other similar design of torque tube in other applications.

关键词： high temperature superconducting(HTS) compositematerial torque tube thermal leakage low temperature test

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