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第二届亚太计算机科学与应用学术会议

作者： Kunning Liang Yufeng Peng Yi Zhang Xueyun Han Jiangting Li College of Electronic and Electric Engineering Henan Normal University Henan Engineering Laboratory of Optoelectronic Technology and Advanced Manufacturing Henan Key Discipline Open Laboratory of Electromagnetic Wave Detecting

Dye laser has many advantages, such as high optical beam quality, wide wavelength tunable ability and weak heat effect. When dye lasers use Stilbene 420 as the lasing medium and pumped by a 355 nm wavelength laser, it can omit optical beam with a central wavelength of 425 nm, with the output wavelength ranges from 419 nm to 434 nm, which is exactly between the low absorption waveband of the sea water. The study of the optical properties of Stilbene 420 has potential application value in underwater communications and military anti-submarine areas. In this paper, the fluorescent spectra of the Stilbene 420 solution were measured by a modular multifunctional grating spectrometer(HORIBA Job in Yvon-1000M) under different wavelengths of pumped laser. The fluorescent properties of the Stilbene 420 with different concentrations were also studied. After this, the influence of the magnetic field on the transmission rate of the Stilbene 420 dye solution was experimentally studied. The results show that the fluorescent spectrum of the Stilbene 420 solution shows broadband characteristic, the intensity of the fluorescent spectrum increase with the increasing of the concentration of solution;and it also shows that the transmission rate changes with the increasing of the magnetic field intensity and the solution concentration.

关键词： Fluorescent characteristics and nonlinear effects of the Stilbene 420 solution

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A Novel Line Circuit Breaker Failure Protection Scheme Based on Substation Area Information

A Novel Line Circuit Breaker Failure Protection Scheme Based...

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2nd International Conference on Artificial Intelligence and engineering Applications(AIEA 2017)

作者： NENG JIN JIAWEI XING LE CHEN YINGFA HE JINGGUANG HUANG XIANGNING LIN State Key Laboratory of Advance Electromagnetic Engineering and Technology (Huazhong University of Science an Technology) State Key Laboratory of Advanced Electromagnet Engineering and Technology (Huazhong University of Science and Technology) Electric Engineering & Renewable Energy School China Three Gorge University

The circuit breaker failure protection with compound voltage blocking has the problem of refusing to trip due to the insufficient sensitivity when a fault happens at the end of the long *** solve this problem,this paper first analyzes the situation that traditional circuit breaker failure protection refuse to act,then the new line circuit breaker failure protection based on substation area information is put forward:calculating local protection criterion to get acting signal at substation area layer,redundant current information is used to judge whether there is current flow,and the voltage information of enclosure device is used to supplement the compound voltage blocking method of circuit breaker failure *** results show that the new scheme of the circuit breaker failure protection based on substation area information sharing has higher reliability.

关键词： Circuit breaker failure protection compound voltage blocking redundancy current substation area information sharing enclosure device

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New control strategy of stand-alone brushless doubly-fed induction generator for supplying unbalanced loads in ship shaft power generation system

New control strategy of stand-alone brushless doubly-fed ind...

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Annual Conference of Industrial Electronics Society

作者： Yi Liu Wei Xu Fei Xiong Frede Blaabjerg College of Mechanical and Electrical Engineering Huanggang Normal University Huanggang China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

The ship shaft power generation system based on a stand-alone brushless doubly-fed induction generator (BDFIG) have demonstrated excellent saving-energy performance. This paper presents a new control scheme of the stand-alone BDFIG for supplying unbalanced loads in the ship shaft power generation system. The positive-and negative-sequence components of the unbalanced power winding (PW) voltage caused by the unbalanced loads are regulated separately. Comprehensive experiments are carried out on a prototype BDFIG by employing the conventional and proposed control schemes. The experimental results verify the good performance of the proposed control scheme.

关键词： Voltage control Rotors Two dimensional displays Marine vehicles Power generation Shafts Engines

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Bi-level model for congestion management with large-scale wind power integration considering realtime operational risks

Bi-level model for congestion management with large-scale wi...

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International Conference on Electrical engineering and Informatics (ICELTICs)

作者： Zhen Fan Xiran Wang Suhua Lou Hui Li Zhidong Wang Mengxuan Lv Zhiming Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Power Economic Research Institute Beijing China

The large-scale integration of wind power is expected to lead to increase of transmission congestion probability due to the uncertain nature of wind power. This paper presents a novel bi-level congestion management model considering real-time operational risk under uncertainty. The upper level model represents the congestion re-dispatching problem, and the lower level model represents real-time operation problem whose objective is to minimize the operational risks. Wind power production uncertainty is modeled through a suitable set of scenarios, and the risks considered in this paper contain the loss of load and wind curtailment. The bi-level model is transformed into a mixed integer linear programming(MILP) problem using Karush-Kuhn-Tucker(KKT) optimality conditions and Fortuny-Amat and McCarl linearization approach. Numerical results indicate the efficiency of the proposed approach.

关键词： Wind power generation Real-time systems Load modeling Production Liquid crystal displays Uncertainty Spinning

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Low-Voltage Analysis of Distribution Network Software Design and Application

Low-Voltage Analysis of Distribution Network Software Design...

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The 9th Asia-Pacific Power and Energy engineering Conference (APPEEC 2017)

作者： Mingqiu Du Yan Li Chunfang Liu Tangjie Liang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Foshan Electric Power Design Institute Co. Ltd.

With the rapid development of urban economy, distribution network construction of city is lagging behind the increment of load, and low-voltage problem has become the main complaints of the power users. Based on Python[1] scripting language, this paper develops a piece of software which can provide a friendly human-machine experience for the user, calculate the voltage of the power distribution area and propose corresponding control measures, then the paper takes the actual power distribution area to verify its effectiveness.

关键词： Low-Voltage Analysis Distribution Network Python

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DC–DC autotransformer with un-interrupted operating capability during DC fault

DC–DC autotransformer with un-interrupted operating capabil...

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6th International Conference on Renewable Power Generation

作者： Li, Mengbo Xiang, Wang Zuo, Wenping Yao, Liangzhong Lin, Weixing Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Province China Renewable Energy Department China Electric Power Research Institute Beijing100192 China TBEA China Xinjiang Sunoasis Co. Ltd. Xinjiang Province China

This study proposed a novel type of DC/DC converter, termed as un-interrupted DC autotransformer (DC AUTO), which has capability to ride through various kinds of DC fault without blocking any devices. Firstly, the working principles and the corresponding design procedures of the un-interrupted DC AUTO are illustrated. Then an effective control strategy is proposed to enable steady operation during both normal time and faulted condition. Finally, a 1000 MW ± 320 kV/ ± 640 kV test system is built on PSCAD/EMTDC platform to testify the technical feasibility of the proposed converter and the effectiveness of the proposed control strategy. © 2017 Institution of engineering and technology. All Rights Reserved.

关键词： DC-DC converters

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An Adaptive Current Quick Break Protection Based on Power Frequency Variation

An Adaptive Current Quick Break Protection Based on Power Fr...

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2017 International Conference on Advances in Materials,Machinery,Electrical engineering(AMMEE 2017)

作者： Hui Li Zixuan Wang Xiangning Lin Ning Xu Zhengtian Li Fanrong Wei Siyi Liu Jinguang Huang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and Technology State Power Research Institute of Jiangxi electric power company

ISBN: (纸本)9781510842915

A mathematical model of resistance type superconducting fault current limiter(R-SFCL) is established and the influence to power frequency variation distance relay has been analyzed firstly. Then, it indicates that the input of the superconducting current limiter changes the circuit model before and after the fault, so that the power frequency variation impedance relay based on the pre fault memory data does not satisfy the superposition condition. An adaptive current quick break protection considering the impedance characteristics of superconducting current limiter is proposed, after the similarity and difference in principle and performance of the adaptive current quick break protection and power frequency variation impedance relay are discussed. Finally, the feasibility and effectiveness of the new method is verified by simulation in EMTDC/PSCAD.

关键词： R-SFCL distance protection power frequency variation distance relay

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Investigation on the Arc Ignition Characteristics and Energy Absorption of Liquid Metal Current Limiter Based on Self-Pinch Effect

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Plasma Science and technology 2016年第5期18卷 531-537页

作者：琚兴宝孙海顺杨倬张俊民 State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology) Wuhan 430074 China School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 China School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China

The GaInSn liquid metal current limiter based on the fluid pinch effect has broad application prospects due to its particular properties. However, the limited rated current and abil- ity of power dissipation are the critical problems for its wide application. Firstly, the temperature distribution of the liquid metal current limiter （LMCL） was obtained by experiments with a rated current of 1 kA and the arc ignition phenomenon was observed with 1.5 kA, which indicates that the rated current is mainly limited by the arc rather than the high temperature compared to the traditional switchgears. Furthermore, an improved method is proposed by adding the paralleled pure resistance, impedance or another LMCL element to protect the setup from the fault energy concentration in the setup. The problem of a slower arc voltage increasing rate can be solved by adding a paralleled impedance with suitable parameters. Finally, the current limiting properties based on the improved method were investigated and the alternating oscillating current was found between two paralleled LMCL elements owing to their deviation of arc ignition in reality.

关键词： arc liquid metal current limiter fluid pinch effect

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Four-Channel Control of Hybrid MMC With Pole-to-Ground DC Fault Ride Through Capability

Four-Channel Control of Hybrid MMC With Pole-to-Ground DC Fa...

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IEEE Power and Energy Society General Meeting

作者： Wang Xiang Weixing Lin Jinyu Wen Cheng Luo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Northern Indiana Public Service Company Merrillville IN 46410 USA

ISBN: (纸本)9781538622131;9781538622124

Compared with half bridge MMC, the hybrid MMC based on full bridge sub-modules (FBSM) and half bridge sub-modules (HBSM) has more control freedoms. It has been reported that the hybrid MMC can regulate the cell capacitor voltages independent of the DC-link voltage. Thus it is able to ride through pole-to-pole DC fault without tripping IGBTs. But few literatures studied the fault ride through control of pole-to-ground (PTG) DC fault which happens more commonly and frequently. To ride through PTG DC fault, this paper presents a four-channel control for symmetrical monopole hybrid MMC. Firstly, system dynamics of hybrid MMC under PTG DC fault is analysed. Based on the analysis, a four-channel control scheme is proposed for hybrid MMC. This controller is mainly composed of a DC current control loop, an AC current control loop and outer control loops. Fault ride through capability under permanent and temporary PTG DC faults is verified by simulations using PSCAD/EMTDC.

关键词： Circuit faults Voltage control Modulation Capacitors Current control Hybrid power systems Bridge circuits

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Comparative study on primary frequency control schemes for variable-speed wind turbines

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The Journal of engineering 2017年第13期2017卷 1332-1337页

作者： Siying Wang Jiabing Hu Shuo Wang Haiyan Tang Yongning Chi State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 People's Republic of China China Electric Power Research Institute Beijing 100192 People's Republic of China

Wind generation have played an important role in the total generation mix in power systems in order to meet the need of environment regulations. The stability of the system frequency may be reduced due to the increasing penetration of wind power, which has attracted wide attention. Several studies have tried to provide the frequency support strategies, but all lack the intensive research of generator frequency response characteristics, the foundation of understanding the system frequency dynamic. To consider the frequency response in weak grid, especially with various complicated control schemes, the uniform comparison is needed. On this basis, this study focuses on wind generators with inertia control and primary frequency control, which can be classified with different strategies and power point track operation. Comparison of the frequency response about synchronous generators, external characteristics (such as turbine inertia and frequency response speed) with typical control schemes and the preliminary idea about modelling is proposed. The simulation result in Matlab/Simulink with the example of doubly-fed induction generator (DFIG) model shows the difference between typical control methods with measurable external behaviours. In addition, the idea and simulation in this paper can be applied to optimise primary frequency control strategies and understand the dynamic of system frequency.

关键词： power generation control synchronous generators frequency control wind power plants power grids wind turbines frequency response machine control system frequency dynamic inertia control power point track operation synchronous generators typical control schemes primary frequency control schemes variable-speed wind turbines wind generation total generation mix power systems wind power frequency support strategies generator frequency response characteristics environment regulations external characteristics turbine inertia frequency response speed Matlab-Simulink DFIG model weak grid

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