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Finite Element Method Applied to Fuse Protection Design

Plasma Science and technology 2014年第3期16卷 294-299页

作者：李森宋执权张明许留伟李金超傅鹏王敏董琳 College of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Institute of Plasma Physics Chinese Academy of Sciences China International Nuclear Fusion Energy Program Execution Center

In a poloidal field （PF） converter module, fuse protection is of great importance to ensure the safety of the thyristors. The fuse is pre-selected in a traditional way and then verified by finite element analysis. A 3D physical model is built by ANSYS software to solve the thermal- electric coupled problem of transient process in case of external fault. The result shows that this method is feasible.

关键词： PF converter thyristor protection fuse verification finite element method

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Estimations of load parameters for PMSM by MRAS

Estimations of load parameters for PMSM by MRAS

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2nd Annual Conference on Electrical and Control engineering, ICECE 2011

作者： Wang, Shaowei Wan, Shanming State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China

ISBN: (纸本)9781424481637

In order to reject disturbance from the variation of load, an estimation method for load parameters for PMSM is presented to online identify moment of inertia and load torque. This method is based on model reference adaptive system through Popov's Hyper stability criteria. The two quantities are essential for the PI controller to be adaptive for maintaining the system's robustness. The simulation and experimental results verify the effectives of the proposed method. © 2011 IEEE.

关键词： Stability criteria

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Impact of large-scale photovoltaic generation integration structure on static voltage stability in China’s qinghai province network

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Journal of engineering 2017年第13期2017卷 671-675页

作者： Wang, Ding Yuan, Xiaoming Zhao, Mingquan Qian, Yunzhe State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei Province430074 China

Large-scale photovoltaic (PV) generations are integrated into China’s Qinghai province network and challenging the system stability. This study focuses on static voltage stability analysis of Qinghai grid in consideration of high-penetration PV generation. The test system is based on the practical network structure of Qinghai grid. Different practical PV integration structures are, respectively, studied by discussing the influences of transmission line length, output power of PV plant and reactive power compensation capacity on system static voltage stability. The authors also compared different PV integration structures to study the effect of topology on static voltage stability. Simulation results are performed in the practical network structure of Qinghai grid. The analysis results can be used to provide guidance for system modification and thereby improve the system operation stability. © 2017 Institution of engineering and technology. All Rights Reserved.

关键词： System stability

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Power supply for generating frequency-variable resonant magnetic perturbations on the J-TEXT tokamak

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Plasma Science and technology 2018年第8期20卷 96-103页

作者： Guo XU Bo RAO Yonghua DING Mao LI Da LI Ruo JIA Minxiong YAN Xinke JI Nengchao WANG Zhuo HUANG Daojing GUO Lai PENG State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People＇s Republic of China School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074People＇s Republic of China

To further research the response of the tearing mode（TM） to dynamic resonant magnetic perturbation（DRMP） on the J-TEXT tokamak, a modified series resonant inverter power supply（MSRIPS） with a function of discrete variable frequency is designed for DRMP coils in this study. The MSRIPS is an AC–DC–AC converter, including a phase-controlled rectifier, an LC filter, an insulated gate bipolar transistor（IGBT） full bridge, a matching transformer, three resonant capacitors with different capacitance values, and three corresponding silicon controlled rectifier（SCR） switches. The function of discrete variable frequency is realized by switching over different resonant capacitors with corresponding SCR switches while matching the corresponding driving frequency of the IGBT full bridge. A detailed switching strategy of the SCR switch is put forward to obtain sinusoidal current waveform and realize current waveform smooth transition during frequency conversion. In addition, a resistor and thyristor bleeder is designed to protect the SCR switch from overvoltage. Manufacturing of the MSRIPS is completed, and the MSRIPS equipment can output current with an amplitude of 1.5 kA when its working frequency jumps among different frequencies. Moreover, the current waveform is sinusoidal and can smoothly transition during frequency conversion. Furthermore, the transition time when the current amplitude rises from zero to a steady state is less than 2 ms during frequency conversion. By using the MSRIPS, the expected discrete variable frequency DRMP is generated, and the phenomenon of the TM being locked to the discrete variable frequency DRMP is observed on the J-TEXT tokamak.

关键词： tearing mode J-TEXT series resonant inverter discrete variable frequency silicon controlled rectifier

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Carrier phase-shifted discontinuous PWM algorithm for cascaded H-bridge inverters

Carrier phase-shifted discontinuous PWM algorithm for cascad...

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2011 International Conference on Electrical Machines and Systems, ICEMS 2011

作者： Qiu, Changqing Huang, Shenghua State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China

ISBN: (纸本)9781457710445

Previous work has shown many general space vector PWM algorithms for cascaded H-bridge inverters. To keep the load balance of switches for cascaded H-bridge inverters, complex pulse cycle control must be added to the algorithms. This paper presents carrier phase-shifted discontinuous PWM (CPS-DPWM) algorithm which can keep load balance of switches automatically. More importantly, switching frequency is reduced up to 2/3 of the previous. Simulation results are given for the verification of CPS-DPWM algorithm. © 2011 IEEE.

关键词： Pulse width modulation

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Design and control of the accelerator grid power supply-conversion system applied to CFETR N-NBI prototype

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Plasma Science and technology 2020年第8期22卷 175-183页

作者： Dongyu WANG Ming ZHANG Shaoxiang MA Shu YANG Kexun YU Yuan PAN State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic of China School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074People's Republic of China

The acceleration grid power supply(AGPS)rated 200 kV/25 A is a key component devoted to supply the acceleration grids of the China fusion engineering test reactor negative-ion-based neutral beam injector(N-NBI)prototype *** paper focused on the design and control of the AGPS conversion system(AGPS-CS),with emphasis on the requirement of the wide range output voltage and rise time.A voltage regulation switch at the front of step-down transformer is applied to optimize the grid current and DC-link ***,a new feedforward control strategy with piecewise PI compensator is proposed to improve the characteristics of *** simulation results of the proposed AGPS-CS are presented,proving the performance of the power supply to achieve the desired requirements.

关键词： CFETR NBI accelerator grid power supply feedforward control high voltage power supply

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Transient-free method of indirect current control for railway traction four-quadrant converters

Transient-free method of indirect current control for railwa...

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38th Annual Conference on IEEE Industrial Electronics Society, IECON 2012

作者： He, Liqun Xiong, Jian Hui, Ouyang Zhang, Pengju Zhang, Kai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China

ISBN: (纸本)9781467324212

In the application of megawatt(MW) rated railway traction drives, as switching frequency is only several hundred hertz, the bandwidth of current loop is usually limited. Instead of instantaneous current feedback control, indirect current control (ICC) is widely used in the front-end four-quadrant converters. Suffering from the low-speed dynamic response and cross-coupling between active and reactive power, conventional indirect current control is not an ideal solution for power conversion. To realize the independent control of active and reactive power, an orthogonal phasor frame is introduced. Furthermore, in order to improve the dynamic performance of conventional ICC, a novel ac current transient-free method is proposed after detailed analyzing of the ac current responding characteristic. Simulation and experiment results proved this method to be effective. © 2012 IEEE.

关键词： Electric current control

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Research on fast solid state DC breaker based on a natural current zero-crossing point

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Journal of Modern Power Systems and Clean Energy 2014年第1期2卷 30-38页

作者： Wang XIANG Yu HUA Jinyu WEN Meiqi YAO Naihu LI State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China Alstom Grid China Technology Center(CTC) Minhang DistrictShanghai 201114China

The DC fault characteristics of voltage source converter based high voltage direct current(VSC-HVDC)systems are analyzed in this *** phenomenon whereby the capacitor on DC side discharges quickly during a DC fault contributes to a large short-circuit fault *** traditional DC breakers nor DC switches can cut off the fault current under this condition.A fast solid state DC breaker design method is proposed in this *** method is based on the fault current characteristics of the inverter in multi-terminal HVDC systems(MTDC),where a fault current appears at the natural zerocrossing point near the *** this point,by coordinating the AC breakers near the rectifier,the DC breaker could reliably cut off the DC fault current and protect the system.A detailed model for this fast solid state DC breaker and its operation sequence are studied,based on this design *** modeling a five-terminal meshed DC grid and a fast DC breaker were carried out with PSCAD/EMTDC using this design *** results from the simulations confirmed the validity of the design method.

关键词： VSC-HVDC Multi-terminal HVDC DC short circuit fault DC breaker

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Isolated Bipolar Modular Multilevel DC-DC Converter with Self-balancing Capability for Interconnection of MVDC and LVDC Grids

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CSEE Journal of Power and Energy Systems 2023年第1期9卷 365-379页

作者： Jinmu Lai Xin Yin Yaoqiang Wang Lin Jiang Zia Ullah Xianggen Yin School of Electrical and Information EngineeringZhengzhou UniversityZhengzhou 450001China Department of Electrical Engineering and ElectronicsUniversity of LiverpoolLiverpoolUK State Key Laboratory of Advanced Electromagnetic Engineering and TechnologyHuazhong University of Scienceand TechnologyWuhan 430074China

Bipolar medium-voltage DC(MVDC)and lowvoltage DC(LVDC)grids have the advantages of flexible integration of distributed renewable-energy generation and reliable power *** order to achieve voltage conversion,power transfer,and electrical isolation for bipolar MVDC and LVDC grids,a high-power DC-DC converter is ***,this paper proposes an isolated bipolar modular multilevel DCDC converter(BiMMDC)with power self-balancing capability for interconnection of MVDC and LVDC *** proposed BiMMDC consists of two series connected MMCs in the MV stage to configure a bipolar MVDC interface,and interleaved converters combined with a dual-transformer are designed in the LV stage to configure the bipolar LVDC interface and to provide a self-balancing *** circuits of two series-connected MMCs and a dual-transformer with interleaved converters are *** that,operation principles of the proposed BiMMDC are introduced,considering balanced/unbalanced power transfer of bipolar LVDC grid and monopolar shortcircuit or open-circuit faults at MVDC *** control scheme is also presented for the proposed BiMMDC under different operating ***,a Matlab simulation and controller hardware-in-the-loop(CHIL)evaluation results are provided to validate the feasibility and effectiveness of the proposed typology and its operating performance.

关键词： Bipolar DC-DC converter equivalent circuit modular monopolar operation multilevel self-balancing

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Research on 18-pulse rectifier based on a boost star-fork connected autotransformer

Research on 18-pulse rectifier based on a boost star-fork co...

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2011 International Conference on Electrical Machines and Systems, ICEMS 2011

作者： Liu, Baoqi Duan, Shanxu Qiu, Chun State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China

ISBN: (纸本)9781457710445

An 18-pulse rectifier based on a step-up or step-down autotransformer in star-fork connection is presented. The voltage vector diagram of the autotransformer is given out and the connection of windings is also analyzed. By arrangement the secondly windings properly, the output voltage can be set in a wide range below or above the 3-phase uncontrolled rectifier with a low THD in the input current. key analysis and results obtained via the Matlab simulation and some experimental results are presented for validation of the presented work. © 2011 IEEE.

关键词： Winding

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