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2020 IEEE Power and Energy Society General Meeting, PESGM 2020

作者： Wu, Xuewei Chen, Zhe Fang, Jiakun Aalborg University Department of Energy Technology Aalborg Denmark Huazhong University of Science and Technology State Key Lab of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728155081

Benefit from its flexible and environmentally friendly capability, integrated electricity and heat system (IEHS) is gaining more and more attention. In order to further release the flexibility from district heating system under variable mass flow and variable temperature (VF-VT) control strategy and cope with the direction variation of mass flow which would appear in practice, a unit commitment problem of IEHS is built in this paper employing implicit upwind differential scheme to characterize the temperature distribution along the pipeline. Additionally, piecewise linear method is adopted to reformulate the original problem into mixed-integer linear programming (MILP) problem, which could be solved efficiently with the related optimization tools. Case study demonstrated on a sixbus six-node IEHS confirmed the validity of the model. © 2020 IEEE.

关键词： Integer programming

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Robust load frequency control and integration of electric vehicles and renewable energy in the grid 8

Robust load frequency control and integration of electric ve...

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8th Renewable Power Generation Conference, RPG 2019

作者： Khan, Musa Sun, Haishun Xiang, Yingmeng Shi, Di Wang, Yuling State Key Lab of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China San JoseCA95134 United States

ISBN: (纸本)9781839531255

The balancing of generation and demand, known as Load Frequency Control (LFC) is a key challenge as always, and currently it requires further attention due to the intermittent Renewable Energies (RE) and new form of Loads, Electric Vehicles (EV) in the grid. An effort is put forward by proposing a model where these worrisome generation' sources and loads can be integrated in the grid, while exploring their strengths. Beside the Conventional Sources (CS), in this model EVs take part in the LFC and RE provides inertial response. The multi objective LFC problem, is synthesised as a robust mixed H2/H∞ based on static output feedback control problem addressed by iterative linear matrix inequality technique. As a test case, a three-area system having EVs, REs and CSs, is simulated in Matlab.Simulink. The EVs, which pose a challenge as an extra load, would be managed to avoid the need of too much new installation of CS and would help the integration of REs like wind and solar energy in the grid. © 2019 Institution of engineering and technology. All rights reserved.

关键词： Iterative methods

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Fault location in distribution networks using Prony analysis

Fault location in distribution networks using Prony analysis

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2011 International Conference on advanced Power System Automation and Protection, APAP 2011

作者： Tang, JinRui Yin, XiangGen Zhang, Zhe He, ZhiQin Ye, Lei Wang, Yuxue State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China Hubei Electric Power Security and High Efficiency Key Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424496198

This paper proposes a new fault location method in distribution networks using Prony analysis. This method just needs the measured voltage transients without multi-recording nodes. Fault-originated traveling waves propagate along the distribution network and reflect at the discontinuity points, so the recorded transients contain some characteristic frequencies associated with specific paths, which can reveal the fault position. Firstly, model and simulate the distribution network using PSCAD/EMTDC to get the recorded signals associated with the typical fault positions. Secondly, extract the frequencies of the recorded signal using Prony analysis to generate the database for fault location. Finally, the real fault-originated signal will be analyzed to locate the fault point by searching the database for fault location based the matching rule. The matching rule is the least squares between the frequencies of the real fault-originated signal and the frequencies corresponding one typical fault position in the database. The simulation results demonstrate that the method is practical, reliable and effective. © 2011 IEEE.

关键词： Electric power distribution

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Characteristics of sub-synchronous interaction among D-PMSG-based wind turbines

Characteristics of sub-synchronous interaction among D-PMSG-...

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作者： Liu, Yuming Wang, Long Sun, Haishun Huang, Biyue State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

With the development of wind energy conversion system (WECS), sub-synchronous oscillations (SSO) phenomena have occurred in direct-drive permanent magnetic synchronous generators (D-PMSGs)-based wind farms. There are several studies on the analysis of the SSO worldwide. However few researchers are concern about the interaction among D-PMSGs. Considering the interaction among D-PMSGs, especially in the weak grid condition, some researches are conducted in this study. The model of D-PMSG is shown firstly. Then the simulations are carried out to research the characteristics of interaction among D-PMSGs. Control parameters of grid side converter and wind turbine (WT) operating conditions are taken into consideration. At last, a proper mitigation method is introduced. Meanwhile, the impact of interaction among WTs on the effect of mitigation method is studied. The simulation result shows that there are distinct interactions among D-PMSGs. The interactions among D-PMSGs need to be considered when coordinating the SSO mitigation control among D-PMSGs. © 2019 Institution of engineering and *** right reserved.

关键词： Synchronous generators

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Effect of stacking layers on the structure and properties of Ca(Mg 1/3Nb2/3)O3/ CaTiO3 thin films

Effect of stacking layers on the structure and properties of...

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6th Asian Meeting on Electroceramics, AMEC-6, in conjunction with the Electronics Division Meeting of the Ceramic Society of Japan

作者： Zhou, Jing Zhu, Jie Chen, Wen Shen, Jie Lei, Qiong He, Huimin State Key Lab. of Advanced Technology for Materials Synthesis and Processing Institute of Materials Science and Engineering Wuhan University of Technology China

ISBN: (纸本)0878493069

Effect of stacking layers on the structure and properties of Ca(Mg 1/3Nb2/3)O3/CaTiO3 (CMN/CT) microwave dielectric heterogeneous thin films prepared was investigated. Precursor solutions for CMN and CT synthesis were obtained by Pechini method. The arrangement pattern has affected structure and properties of heterogeneous thin film. The CMN-CT arrangement heterostructure thin film has second phase from the CMN films layer. The CT-CMN heterostructure film which has a smooth and dense microstructure was composed of pure perovskite phase without any second phase, this result was attributed to the CT film layer which is a buffer layer between substrate and CMN film layer. At 1MHz frequency, CT-CMN exhibits the dielectric properties of Εr=47.5, tanδ=0.020. © (2010) Trans Tech Publications.

关键词： Thin films

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Energy modelling for FDM 3D printing from a life cycle perspective

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International Journal of Manufacturing Research 2017年第1期12卷 83-98页

作者： Peng, Tao Sun, Wenjun State Key Lab. of Fluid Power Transmission and Control Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province College of Mechanical Engineering Zhejiang University Hangzhou310027 China Industrial Engineering Centre College of Mechanical Engineering Zhejiang University Hangzhou310027 China

Advances in 3D printing is penetrating in many industries. It is changing the way of doing manufacturing business and people's life. Performing energy and related environmental impact analysis of this technology is necessary and profound. In this paper, energy modelling is studied for FDM printing from a life cycle perspective. For a typical FDM life cycle, the stages covered are material production, printing, post-processing and related transportation. For each stage, energy consumption is modelled and measures for unit energy consumption are also proposed to assist quick calculation of a life cycle energy consumption. Besides, the machines used in different stages are analysed and the main energy consuming components are summarised. Based on a sample part, preliminary calculation of its life cycle energy consumption is presented, showing that life cycle energy saving is possible, particular with collective efforts from different stages. This offers additional data to select an energy-efficient manufacturing process. Copyright © 2017 Inderscience Enterprises Ltd.

关键词： Energy utilization

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A discrete-time state space modelling method applying to SSO of renewable power generation 9

A discrete-time state space modelling method applying to SSO...

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9th Renewable Power Generation Conference, RPG Dublin Online 2021

作者： Han, Yingsheng Sun, Haishun Huang, Biyue Yu, Yongjun State Key Lab of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China State Grid Xinjiang Electric Power Research Institute Urumqi830011 China

ISBN: (纸本)9781839535048

With an increasing integration of renewable power generation (RPG) in the power system, the issue of sub-synchronous oscillation (SSO) is becoming increasingly significant. In this paper, a discrete-time state space modelling and analysis approach with nodal analysis method for SSO investigation is proposed, which solves the disadvantages of traditional eigenvalue analysis method in the face of complex power grids, especially the inconvenience of modelling improper network. This new method modularizes the system components and can directly obtain the discrete transition matrix of any complex network through coefficient matrix expansion. The stability of the system can be discussed by analysing the eigenvalues of discrete-time state matrix in z- and s-domain. The accuracy of the new method is validated by simulation results of a practical wind farm example in northwestern China. © 2021 Institution of engineering and technology. All rights reserved.

关键词： Eigenvalues and eigenfunctions

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Growth and properties of pulsed laser deposited K3Li2Nb5O15 thin films

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key engineering Materials 2007年 351卷 184-188页

作者： Zhan, Zusheng Gong, Yansheng Shen, Qiang Zhang, Lianmeng State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Chemical Engineering China University of Geosciences Hubei Wuhan 430074 China

Potassium lithium niobate (KLN: K3Li2Nb5O15) films have been deposited on quartz glass by Pulsed laser deposition (PLD) technique using a stoichiometric KLN target as starting materials. By investigating the effects of both the oxygen pressure and the substrate temperature on the structure of KLN films, optimum parameters have been identified for the growth of high-quality KLN films. At 10Pa oxygen ambient pressure, tetragonal tungsten-bronze-type structure of KLN films with (310) preferred orientation can be achieved at substrate temperatures in the range of 700-800°C Optical studies indicate that the films are highly transparent in the visible-near-infrared wavelength range.

关键词： Thin films

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Manmade Target Scattering Structure Null-Pol Recognition and Application

Manmade Target Scattering Structure Null-Pol Recognition and...

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2021 CIE International Conference on Radar, Radar 2021

作者： Wu, Guoqing Chen, Siwei Li, Yongzhen Wang, Xuesong State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information System School of Electronic Science and Engineering National University of Defense Technology ChangSha China

ISBN: (纸本)9781665498142

Target's optimal polarization is the fundamental theory of radar polarization. Null-Pol, also called Co-Pol Null, is one of the significant polarization states, through which other optimal polarization states can be derived. Null-Pol theory is widely applied in polarization reception match, contrast enhancement and so on. This paper revealed the advantage of Null-Pol theory in manmade target scattering structure recognition for the first time. The complex polarization ratio plane and polarization response characteristics were combined and the Null-Pol 3D response patterns were represented, which can reveal the difference of canonical scattering structures. Then, the Null-Pol scattering structure recognition method of manmade targets is proposed. The scattering centers are extracted from radar images. The scattering structure type can be identified by matching the Null-Pol response characteristic vectors with canonical scatters. Through the analysis of electromagnetic computation data of manmade targets, the proposed Null-Pol scattering structure recognition method can identify the scattering structure types of manmade targets. Especially, the results of symmetric targets have better performance than Cameron decomposition, which is more consistent with target's actual scattering structure types. © 2021 IEEE.

关键词： 3D response characteristic pattern manmade target Null-Pol scattering structure recognition target's optimal polarization

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Power Limitation Analysis of Hybrid MMC Considering Sub-Module Balancing Constraint

Power Limitation Analysis of Hybrid MMC Considering Sub-Modu...

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2018 IEEE Power and Energy Society General Meeting, PESGM 2018

作者： Lu, Xiaojun Xiang, Wang Wen, Jinyu Lin, Weixing State Key Lab of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China TBEA China Xinjiang Sunoasis Co. Ltd. Xi'an China

ISBN: (纸本)9781538622124

Due to the hybrid composition of half-bridge submodule (HBSM) and full-bridge sub-module (FBSM) in each phase arm, hybrid modular multilevel converter (MMC) is able to actively adjust the output DC voltage and operate under reduced DC voltage. Sub-module balancing is one of the most concerned issues regarding low DC voltage operation. This paper analyzes the impact of sub-module balancing constraint on the active and reactive power transfer ability of hybrid MMC. The calculation method of the marginal active and reactive power limited by sub-module balancing constraint is presented, considering the characteristics of arm current and arm output voltage. The effect of DC voltage on the feasible operating area is studied. The proposed method can be treated as the empirical formulas to estimate the feasible active and reactive power range. © 2018 IEEE.

关键词： HVDC power transmission

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