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| 1 | An Integrated Control and Protection System for Photovoltaic Microgrids显示文摘The microgrid has shown to be a promising solution for the integration and management of intermittent renewable energy generation.This paper looks at critical issues surrounding microgrid control and protection.It proposes an integrated control and protection system with a hierarchical coordination control strategy consisting of a stand-alone operation mode,a grid-connected operation mode,and transitions between these two modes for a microgrid.To enhance the fault ride-through capability of the system,a comprehensive three-layer hierarchical protection system is also proposed,which fully adopts different protection schemes,such as relay protection,a hybrid energy storage system(HESS)regulation,and an emergency control.The effectiveness,feasibility,and practicality of the proposed systems are validated on a practical photovoltaic(PV)microgrid.This study is expected to provide some theoretical guidance and engineering construction experience for microgrids in general. | Laijun Chen Shengwei Mei | 2015 | CSEE Journal of Power and Energy Systems2015，1，1： | 27 |
| 2 | Paving the Way to Smart Micro Energy Grid:Concepts,Design Principles,and Engineering Practices显示文摘The interconnection between initially independent energy infrastructures offers additional system flexibility and efficiency.The integration at distribution level simplifies the implementation of the integrated energy system functionalities.This paper proposes concepts and design principles of a smart micro energy grid(MEG)for accommodating micro-grids,distributed poly-generation systems,energy storage facilities,and associated energy distribution infrastructures.The energy management system is responsible for the smart operation of the MEG while supporting multiple criteria,such as safety,economy,and environmental protection.To realize the vision of the smart MEG,an engineering game theory based energy management system with self-approaching-optimum capability is investigated.Based on the proposed concepts,design principles,and energy management system,this paper presents a prototype of China’s first conceptual solar-based smart MEG,established in Qinghai University. | Shengwei Mei Rui Li Xiaodai Xue Ying Chen Qiang Lu Xiaotao Chen Carsten D.Ahrens Ruomei Li Laijun Chen | 2017 | CSEE Journal of Power and Energy Systems2017，3，4： | 14 |
| 3 | VSG-based Adaptive Droop Control for Frequency and Active Power Regulation in the MTDC System显示文摘In this paper,a VSG(virtual synchronous generator)-based method with adaptive active power and DC voltage droop is proposed for the control of VSC stations in the multi-terminal DC(MTDC)system.This control strategy can improve the inertial level of the AC networks and attenuate the rate of change of frequency when a disturbance occurs.In addition,the droop control of the active power and DC voltage is implemented to make the AC networks share the unbalanced power in the MTDC.The droop coefficients are adaptively adjusted depending on the frequency margin of every AC network,which makes the allocation of unbalanced power among AC networks more reasonable from the frequency variation perspective.The control strategy is evaluated in the scenarios of sudden load change and wind turbine tripping,and the results are presented to demonstrate its effectiveness. | Ren Wang Laijun Chen Tianwen Zheng Shengwei Mei | 2017 | CSEE Journal of Power and Energy Systems2017，3，3： | 13 |
| 4 | Factors Influencing FDI Location Choice in China's Inland Areas显示文摘自从 1978,外国直接投资(FDI ) 的体积在中国去了东南的沿海的区域,与仅仅小部分收到的内陆。与在 2000 的西方的发展策略和华中的发射升起在 2004 的策略,投资地点的选择膨胀了到内陆区域。基于从 1999 ~ 2005 盖住 98 个内陆城市的面板数据,这研究为投资在的 FDI 识别地点偏爱变量中国是内陆区域,并且发现象自然资源那样的生长得很好的因素和低劳动费用不是在在中国的内陆以内决定 FDI 地点的重要因素。相反,政策刺激和工业凝块是最重要的因素。现在的学习的调查结果为两个主人乡村当局和跨国的公司有政策含意。 | Laijun Luo Louis Brennan Chang Liu Yuze Luo | 2008 | China & World Economy2008，16，2： | 11 |
| 5 | Recent advances on smart grid technology and renewable energy integration显示文摘With the integration of renewable energy generations and other related changes,the smart grid,or the future electric power system,is confronted with new challenges and opportunities.Therefore,it is a promising subject in electrical engineering and much work has been done on it.This paper reviews the recent advances on the technologies of smart grid and renewable energy integration,from the aspects of modeling,simulation,protection and control,stability,operation,and planning. | MEI ShengWei CHEN LaiJun | 2013 | Science China(Technological Sciences)2013，56，12： | 8 |
| 6 | Flexible unbalanced control with peak current limitation for virtual synchronous generator under voltage sags显示文摘Virtual synchronous generator(VSG)is gridfriendly for integrating distributed generations(DGs)since it can emulate the operation mechanism of traditional synchronous generator(SG).However,the traditional VSG control strategy,which is mainly suitable for balanced voltage conditions,may lead to power oscillations,current unbalance and even overcurrent under unbalanced voltage sags.To overcome this difficulty,a flexible unbalanced control with peak current limitation for VSG under unbalanced operating conditions is proposed.Based on the basic VSG control algorithm,the control strategy integrates two novel control modules,which are current reference generator(CRG)and power reference generator(PRG).The proposed control strategy can flexibly meet different operation demands,which includes current balancing,constant active or reactive power.And the injected currents are kept within safety values for a better utilization of the VSG power capacity.Furthermore,the experimental platform is built.Experimental results demonstrate the validness and effectiveness of the proposed control strategy. | Tianwen ZHENG Laijun CHEN Yan GUO Shengwei MEI | 2018 | Journal of Modern Power Systems and Clean Energy2018，6，1： | 6 |
| 7 | Realizing high low-electric-field energy storage performance in AgNbO_(3) ceramics by introducing relaxor behaviour显示文摘Both sustainable development in environment and safety of high-power systems require to develop a novel lead-free dielectric capacitor with high energy density(Wrec)at low applied electric field.In this work,a remarkably high Wrec of 2.9 J/cm^(3) accompanying with energy storage efficiency of 56% was achieved in Ag_(0.9)Sr_(0.05)NbO_(3) ceramic at a low applied electric field of 190 kV/cm,by improving antiferroelectricity and introducing relaxor behaviour.The improved anti-ferroelectric stability was attributed to the decreased tolerance factor and average electronegativity difference,while the relaxor behaviour was associated with the increased disordered local structure by Sr-doping.Moreover,the Ag_(0.9)Sr_(0.05)NbO_(3) ceramics also exhibited outstanding temperature stability in energy density with small variation less than 5% over 20-140℃.The results indicate that the Ag_(0.9)Sr_(0.05)NbO_(3) ceramic is a promising candidate for low-electric-field driving capacitors. | Kai Han Nengneng Luo Shuaifei Mao Fangping Zhuo Xiyong Chen Laijun Liu Changzheng Hu Huanfu Zhou Xinpeng Wang Yuezhou Wei | 2019 | Journal of Materiomics2019，5，4： | 5 |
| 8 | Export,subsidy and innovation:China’s state-owned enterprises versus privately-owned enterprises显示文摘In this study,we advance the literature on export and government subsidy by examining their effects in the context of China,a fastgrowing emerging economy,and comparing the effects across ownership of enterprises.We examine the relationship among export,government support and firms’innovation capability,and how these relationships differ between state-owned and private owned enterprises,by using a large data sample of Chinese firms(2003–2007).First,we find that there exists an inverted U-shaped relationship between export and innovation in state-owned enterprises,but not in private owned enterprises.Second,there is a positive effect of government subsidy on firms’innovation capability.Finally,from the sub-sample analyses,we identify differences in the impact of government support between SOEs and POEs.This study will inspire future research into these issues in the disciplines of marketing,management and international business. | Laijun Luo Yang Yang Yuze Luo Chang Liu | 2016 | Economic and Political Studies2016，4，2： | 4 |
| 9 | A low-firing melilite ceramic Ba2CuGe207 and compositional modulation on microwave dielectric properties through Mg substitution显示文摘A melilite Ba2CuGe2O7 ceramic was characterized by low sintering temperature and moderate microwave dielectric properties.Sintered at 960℃,the Ba2CuGe2O7 ceramic had a high relative density 97%,a low relative permittivity(εr)9.43,a quality factor(Q×f)of 20,000 GHz,and a temperature coefficient of resonance frequency(τf)-76 ppm/℃.To get a deep understanding of the relationship between composition,structure,and dielectric performances,magnesium substitution for copper in Ba2CuGe2O7 was conducted.Influences of magnesium doping on the sintering behavior,crystal structure,and microwave dielectric properties were studied.Mg doping in Ba2CuGe2O7 caused negligible changes in the macroscopic crystal structure,grain morphology,and size distribution,while induced visible variation in the local structure as revealed by Raman analysis.Microwave dielectric properties exhibit a remarkable dependence on composition.On increasing the magnesium content,the relative permittivity featured a continuous decrease,while both the quality factor and the temperature coefficient of resonance frequency increased monotonously.Such variations in dielectric performances were clarified in terms of the polarizability,packing fraction,and band valence theory. | Changzhi YIN Zezong YU Longlong SHU Laijun LIU Yan CHEN Chunchun LI | 2021 | Journal of Advanced Ceramics2021，10，1： | 3 |
| 10 | Research focuses and advance technologies of smart grid in recent years显示文摘The smart grid is attracting more and more attention in electrical engineering for its promising features.However,huge challenges also exist in the implementations of the smart grid,such as high penetration of renewable energy resources,low carbon electricity and cyber-physical security,etc.In this paper,the latest progress of some research focuses and advance technologies in the development of smart grid is reviewed. | MEI ShengWei CHEN LaiJun | 2012 | Chinese Science Bulletin2012，57，22： | 3 |
| 11 | Identification of reversible insertion-type lithium storage reaction of manganese oxide with long cycle lifespan显示文摘Recently,MnO2 has gained attention as an electrode material because of its very high theoretical capacity and abundant availability.However,the very high volumetric change caused by its conversion-type reaction results in bad reversibility of charge-discharge.In this study,δ-MnO2 of thickness 8 nm anchored on the surface of carbon nanotubes(CNT)by Mn-O-C chemical bonding is synthesized via a facile hydrothermal method.Numerous ex-situ characterizations of the lithium storage process were performed.Furthermore,density functional theory(DFT)calculations indicated thatδ-MnO2(012)thermodynamically prefers bonding with CNTs.Moreover,the interfacial interaction reinforces the connection of Mn-O and reduces the bond strength of Li-O in lithiated MnO2,which could facilitate an intercalation-type lithium storage reaction.Consequently,the as-synthesizedδ-MnO2 retains an excellent reversible capacity of 577.5 mAh g-1 in 1000 cycles at a high rate of 2 A g-1 between 0.1 V and 3.0 V.The results of this study demonstrate the possibility of employing the cost-effective transition metal oxides as intercalation lithium storage dominant electrodes for advanced rechargeable batteries. | Yuxuan Zhang Fang Lian Jianhao Lu Laijun Ma Ning Chen Yanan Chen Dingguo Xia | 2020 | Journal of Energy Chemistry2020，29，7： | 3 |
| 12 | Real-time electromagnetic transient simulation algorithm for integrated power systems based on network level and component level parallelism显示文摘The analysis and simulation of power system are becoming more and more challenging as the complexity of system topology and components has been increased.In this paper,a hybrid parallel algorithm is proposed for the real-time electromagnetic transient simulation(EMTS) of integrated power systems containing multiphase machines.The proposed algorithm is composed of a novel network partition method called component level parallelization and the Multi-Area Thevenin Equivalent(MATE) method,which extends the flexibility of the network partition in parallel simulation.Moreover,several methods are developed to enhance the efficiency of the communication and computation.Power systems with up to 410 single-phase electrical nodes and 336 switches are simulated in a time step of 50 s to validate the proposed algorithm. | CHEN LaiJun CHEN Ying MEI ShengWei | 2012 | Science China(Technological Sciences)2012，55，11： | 2 |
| 13 | ERMAP is a B7 family-related molecule that negatively regulates T cell and macrophage responses显示文摘T cell activation and tolerance are tightly regulated by costimulatory and coinhibitory molecules.B7 family members play a crucial role in regulating immune responses.In this study,we identified erythroid membrane-associated protein(ERMAP)as a novel T cell inhibitory molecule.ERMAP shares significant sequence and structural homology with existing B7 family members in its extracellular domain.The ERMAP protein is expressed on the cell surface of resting and activated antigen-presenting cells(APCs)and in some tumor tissues.The putative ERMAP receptor is expressed on activated CD4 and CD8 T cells and macrophages.Both mouse and human ERMAP-IgG2a Fc(ERMAP-Ig)fusion proteins inhibit T cell functions in vitro.Administration of ERMAP-Ig protein ameliorates autoimmune diseases,including experimental autoimmune encephalomyelitis and type 1 diabetes,in mice.Anti-ERMAP antibody enhances macrophage phagocytosis of cancer cells in vitro.Furthermore,administration of an anti-ERMAP antibody inhibits tumor growth in mice likely by blocking the inhibitory effects of ERMAP on T cells and macrophages.Our results suggest that therapeutic interaction with the ERMAP inhibitory pathway may represent a novel strategy for treating patients with autoimmune disease or cancer. | Min Su Yujun Lin Cheng Cui Xiaohong Tian Laijun Lai | 2021 | Cellular & Molecular Immunology2021，18，8： | 2 |
| 14 | Large electrostrain in Bi_(1/2)Na_(1/2)TiO_(3)-based relaxor ferroelectrics:A case study of Bi_(1/2)Na_(1/2)TiO3-Bi_(1/2)K_(1/2)TiO_(3)-Bi(Ni_(2/3)Nb_(1/3))O_(3) ceramics显示文摘(1-x)(0.8Bi_(1/2)Na_(1/2)TiO3-0.2Bi_(1/2)K_(1/2)TiO3)-xBi(Ni_(2/3)Nb_(1/3))O3(BNKT-xBNN)solid solution ceramics were fabricated by high temperature solid-state reaction method.All the compositions possess relaxor ferroelectric features,among which the ergodic BNKT-0.02BNN exhibits large repeatable electrostrain value Suni¼0.51%at electric field of 65 kV/cm,with high piezoelectric stain coefficient d33*of 890 pm/V at 45 kV/cm,while the non-ergodic compositions present unrepeatable large strain response.Based on the electric field-composition phase diagram,the repeatability of strain response in ergodic compositions can be attributed to the reversible electric-field-induced phase transition.In addition,the effects of BNN contents on the macroscopic strain properties are explored by analyzing the existing states of the polar regions with corresponding thermal evolutions and electric-field-induced phase transitions.This research is expected to guide the design of lead free relaxor ferroelectric materials with desired electrostrain properties. | Guangzhi Dong Huiqing Fan Laijun Liu Pengrong Ren Zhenxiang Cheng Shujun Zhang | 2021 | Journal of Materiomics2021，7，3： | 2 |
| 15 | Probing thermally-induced structural evolution during the synthesis of layered Li-, Na-, or K-containing 3d transition-metal oxides显示文摘Layered alkali-containing 3d transition-metal oxides are of the utmost importance in the use of electrode materials for advanced energy storage applications such as Li-,Na-,or K-ion batteries.A significant challenge in the field of materials chemistry is understanding the dynamics of the chemical reactions between alkali-free precursors and alkali species during the synthesis of these compounds.In this study,in situ high-resolution synchrotron-based X-ray diffraction was applied to reveal the Li/Na/K-ion insertion-induced structural transformation mechanism during high-temperature solid-state reaction.The in situ diffraction results demonstrate that the chemical reaction pathway strongly depends on the alkali-free precursor type,which is a structural matrix enabling phase transi-tions.Quantitative phase analysis identifies for the first time the decomposition of lithium sources as the most critical factor for the formation of metastable intermediates or impurities during the entire process of Li-rich layered Li[Li_(0.2)Ni_(0.2)Mn_(0.6)]O_(2) formation.Since the alkali ions have different ionic radii,Na/K ions tend to be located on prismatic sites in the defective layered structure(Na_(2/3-x)[Ni_(0.25)Mn_(0.75)]O_(2) or K_(2/3-x)[Ni_(0.25)Mn_(0.75)]O_(2))during calcination,whereas the Li ions prefer to be localized on the tetrahedral and/or octahedral sites,forming O-type structures. | Weibo Hua Xiaoxia Yang Nicola PMCasati Laijun Liu Suning Wang Volodymyr Baran Michael Knapp Helmut Ehrenberg Sylvio Indris | 2022 | eScience2022，2，2： | 2 |
| 16 | Applying empirical mode decomposition (EMD) and entropy to diagnose circuit breaker faults 显示文摘 | Liu Mingliang Wangkeqi Sun laijun | 2015 | International Journal for Light and Electron Optics2015，126，20： | 1 |
| 17 | Hot-injection synthesis of highly luminescent and monodisperse CdS nanocrystals using thioacetamide and cadmium source with proper reactivity显示文摘 | ZHANG Laijun SHEN Xingcan LIANG Hong | 2010 | Journal of Colloid and Interface Science2010，342，2： | 1 |
| 18 | A Rumor Spreading Model with Variable Forgetting Rate 显示文摘 | Zhao Laijun Xie Wanlin Gao H O | 2013 | Physica A Statistical Mechanics & Its Applications2013，392，23： | 1 |
| 19 | 显示文摘 | Zhang Zhongyi | 2003 | Chinese Journal of Luminescence2003，24，2： | 1 |
| 20 | SIHR rumor spreading model in social networks显示文摘 | Zhao Laijun Wang Jiajia Chen Yucheng | 2012 | Physica A:Statistical Mechanics and Its Applications2012，391，7： | 1 |
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