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检索条件"机构=1State Key Laboratory of Advanced Electromagnetic Engineering and Technology"

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Wideband Refractive Index Extraction of Low-loss Materials with the Combined TDS-FTIR Method

Wideband Refractive Index Extraction of Low-loss Materials w...

引用

International Conference on Infrared and Millimeter Waves

作者： Lei Cao Shanshan Jia Huiting Xia Zhengya Yin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

A method to obtain the optical constants of low loss materials in a wide frequency range was proposed based on the measured transmission data from THz-TDS and FTIR. With anchoring phase points from TDS, the phase spectrum lost in FTIR original data was successfully retrieved and the complex refractive index was acquired with standard iterative method (Nelder-Mead and Newton-Raphson). As an example, the refractive index and extinction coefficient of HRSi were extracted from 0.5 to 10 THz with both iterative method and analytic formula. Good agreement between TDS and FTIR results in the overlapped frequency range was realized.

关键词： Refractive index Propagation losses Optical variables control Loss measurement Optical materials Frequency measurement Iterative methods

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A damping control strategy for torsional oscillations of DFIG-based WTs caused by inertia control

A damping control strategy for torsional oscillations of DFI...

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2020 IEEE Power and Energy Society General Meeting, PESGM 2020

作者： Zhang, Xiaojie Hu, Jiabing He, Wei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781728155081

As wind power plays an increasingly important role in power systems, the safe and steady operation of wind turbines is causing more attention. The torsional oscillation in doubly fed induction generation based (DFIG-based) wind turbines (WTs) is a serious problem reducing service life of mechanical component. However, as the grid codes require wind farms to participate in frequency response, the application of inertia control may make the issue more significant. This paper presents a damping control strategy for suppressing torsional oscillation of DFIG-based WTs' drive-train caused by the inertia control. Different from the existing damping control schemes, the proposed damping control is based on modulation of reactive current of grid-side converter. This kind of control scheme can effectively restrain torsional oscillation without increasing the complexity of torque control or speed control. Time-domain simulations are performed to demonstrate the efficacy of the proposed control scheme. © 2020 IEEE.

关键词： Wind turbines

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Transient and Steady-state Response of AlGaN/GaN Terahertz Detectors under Sinusoidal Excitation of Different Intensities

Transient and Steady-State Response of AlGaN/GaN Terahertz D...

引用

International Conference on Infrared and Millimeter Waves

作者： Huiting Xia Zhengya Yin Shanshan Jia Lei Cao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Terahertz field effect transistors (TeraFETs) based on AlGaN/GaN materials have high responsivity and sensitivity at room temperature. Based on the hydrodynamic equations, the nonlinear voltage response (transient and steady-state) of this type of THz detector was numerically calculated by finite difference method under THz excitation with different frequencies and intensities. Comparisons with the existing analytical formula and the analysis of the influence of viscosity coefficient on the response were also presented.

关键词： Viscosity Temperature sensors Sensitivity Detectors Voltage Mathematical models Wide band gap semiconductors

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Dual-Side Three-stage Asymmetric Phase Shift Strategy for Bidirectional Inductive Power Transfer System with SiC Power Module

Dual-Side Three-stage Asymmetric Phase Shift Strategy for Bi...

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Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia)

作者： Haowen Chen Changsong Chen Mengjie Jiang Shuran Jia Xuezheng Huang The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665448178

Power exchange between vehicle and grid by bidirectional inductive power transfer (BIPT) system. This paper proposes a dual-side three-stage asymmetrical phase shift (TAPS) control strategy to achieve a high transmission efficiency with zero voltage switching (ZVS) in a wide range of load. With the proposed dual-side TAPS strategy, asymmetrically adjust the amplitude of the ac fundamental excitation voltage with three adjacent control periods as a waveform period. A wide ZVS range and a high system power factor can be realized simultaneously. In addition, when the load is light, the number of switching actions is significantly reduced. The control scheme for the full bridge of both sides is presented, which realizes both optimization of transmission efficiency and zero-voltage switching operation for all power switches. Simulation are performed to compare the effects of triple-phase-shift (TPS) strategy and proposed TAPS strategy on the transmission efficiency, which shows that the system with proposed TAPS control strategy realizes a higher transmission efficiency in a wide range of load.

关键词： Reactive power Silicon carbide Photonic band gap Asia Switches Zero voltage switching Control systems

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Improved Longitudinal Protection for T-connected Inverter Interfaced Distributed Generation Distribution Network

Improved Longitudinal Protection for T-connected Inverter In...

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Sustainable Power and Energy Conference (iSPEC)

作者： Shengyuan Guan Jian Qiao Wenting Weng Shaoxiang Ma State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665414401

Inverter interfaced distributed generator (IIDG) is connected to the distribution network in the form of T-connected, which changes the operating characteristics of single power flow direction in the traditional distribution network, and makes the traditional three-stage current protection no longer applicable. Therefore, this paper proposes an improved longitudinal protection method for T-connected inverter distributed power distribution networks. The control strategy of IIDG is analyzed, and the analysis method in a distribution network is given. On this basis, an improved criterion of longitudinal protection is proposed. The proposed criterion can sensitively identify internal and external faults that is not affected by DGs. Simulation results of PSCAD verify the effectiveness of the proposed method.

关键词： Resistance Performance evaluation Simulation Distribution networks Information processing Inverters Generators

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Research on a Fundamental and Harmonic Detection Method Based on D-Q Rotating

Research on a Fundamental and Harmonic Detection Method Base...

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2020 International Conference on Ubiquitous Power Internet of Things, UPIOT 2020 and 4th International Symposium on Green Energy and Smart Grid, SGESG 2020

作者： Gong, Jie Xue, Feng Zhang, Guangyi Pan, Wenhao Wang, Tingkang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The widespread use of power electronics in power systems has led to increasingly serious power quality problems in power systems. Active power filters play an important role in governing the harmonics of power systems. The fast and accurate detection of fundamental and harmonic currents in power systems is one of the key aspects of power filters to manage harmonics. In this paper, a new detection method for the fundamental or the nth harmonic component of the fundamental by presetting the frequency of the d-q conversion matrix is proposed. Analysis of simulation results shows that the detection method is not affected by the voltage distortion or asymmetry of the three-phase circuit, and that the results for fundamental and harmonic detection. The ability to accurately reflect changes in frequency and amplitude excursions. © Published under licence by IOP Publishing Ltd.

关键词： Harmonic analysis

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An Optimal Winding-end Connection Principle with Minimum Bridge Current Stress for Odd-Phase Series-end Winding Topology

An Optimal Winding-end Connection Principle with Minimum Bri...

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European Conference on Power Electronics and Applications

作者： Xiangwen Sun Zicheng Liu Zhiyuan Wang Jilan Huang An Li Dong Jiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

The multiphase series-end winding motor drive receives attention due to its low cost, complete control freedoms and abundant winding connection selections. Different winding series combination will cause huge performance diversity in voltage utilization or bridge current stress. The most widely used solutions now possess excellent voltage utilization, but the same high current stress will limit its application that are more sensitive to current. This paper proposes an optimal winding connection sequence to get the theoretically lowest bridge current stress of odd-phase series-end winding topology. Experiment results verify the feasibility of proposed winding connection methods.

关键词： Motor drives Phase modulation Windings Bridge circuits Europe Optical wavelength conversion Power electronics

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Modelling of Renewable-energy-base Heat and Power System and Regulation Method Study

Modelling of Renewable-energy-base Heat and Power System and...

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2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Li, Zhenxing Zhou, Jianyu Chen, Xia Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781728191645

The traditional combined heat and power (CHP) systems rely on fossil energy sources. Most of the recent research on the CHP system is static analysis, and the lack of dynamic mechanism research makes the system's regulation inaccurate. This paper develops a renewable-energy-base heat and power (REHP) system. The whole system can be divided into several modules through modular decomposition. The dynamic mechanism is analyzed for each module and the corresponding model is constructed. Based on each module, a simulation platform that can reflect the system's dynamics is constructed. To overcome the fluctuation of renewable energy and stabilize the energy output of RECHP, a real-time regulation method is proposed. The simulation results verify the effectiveness of the constructed simulation model and the regulation method. © 2020 IEEE.

关键词： Renewable energy resources

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A Compact 175°C High Temperature Gate Driver with Isolated Power Supply and advanced Protection for HybridPACK Drive SiC Module

A Compact 175°C High Temperature Gate Driver with Isolated ...

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Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia)

作者： Cheng Qian Neng Wang Yayong Yang Zhiqiang Jack Wang Yong Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665448178

The operation of silicon carbide (SiC) power semiconductor devices under high ambient temperature requires high temperature gate drivers adjacent to the devices. This paper presents a three-phase isolated gate driver circuit suitable for HybridPACK Drive (HP Drive) power modules with operating ambient temperature up to 175°C. First, an overall introduction of the gate driver structure and layout design method for reducing thermal coupling are presented. Second, detailed designs are presented in the form of sub-circuits such as desaturation protection circuit, isolated power supply, active Miller clamp, undervoltage lockout and so on. Finally, the proposed gate driver design is validated through double pulse test, continuous full-load operation under 145°C and continuous light-load test under 175°C. Comprehensive performance evaluation of proposed high temperature gate driver is presented.

关键词： Couplings Power supplies Silicon carbide Photonic band gap Design methodology Layout Asia

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Effect of Inverter-type Distributed Power Supply Access on the Zero Sequence Current Distribution of AC Lines

Effect of Inverter-type Distributed Power Supply Access on t...

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Power Energy Systems and Applications (ICoPESA), International Conference on

作者： Zhengxu Qian Wulue Pan Ruizhi Ma Feng Xu Wenbin Cao Zanzan Zhang Zhile Xu Minghao Wen State Grid Zhejiang Electric Power Co. Ltd. Research Institute Hangzhou China State Grid Zhejiang Electric Power Co. Ltd. Hangzhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

For the Inverter-Interfaced Distributed Generator (IIDG) access system, a ground fault occurred on the 110 kV contact line, and the zero-sequence current distribution on both sides of the line was analyzed by combining the characteristics of the controlled current source of the IIDG after the fault, the relationship between the sequence quantities, the neutral grounding method of the transformer and the access capacity of the IIDG. Factors. The analysis points out that the IIDG access side transformer neutral grounding mode determines the zero sequences current distribution on both sides of the line; when the system side circuit breaker is disconnected, the IIDG access capacity mainly affects the zero sequences current distribution, and the local load power level has a small effect on the zero sequence current distribution. The correctness of the theoretical analysis is verified by PSCAD/EMTDC software simulation.

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