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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 | 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 |
| 5 | 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 |
| 6 | 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 |
| 7 | 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 |
| 8 | 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 |
| 9 | 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 |
| 10 | 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 |
| 11 | 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 |
| 12 | Cryptotanshinone induces cell cycle arrest and apoptosis of multidrug resistant human chronic myeloid leukemia cells by inhibiting the activity of eukaryotic initiation factor 4E显示文摘 | Yuqing Ge Rubin Cheng Yuhong Zhou Jianping Shen Laijun Peng Xiaofeng Xu Qun Dai Pei Liu Haibing Wang Xiaoqiong Ma Jia Jia Zhe Chen | 2012 | Molecular and Cellular Biochemistry2012，，1： | 1 |
| 13 | SIHR RumorSpreading Model in Social Networks显示文摘 | Laijun Zhao Jiajia Wang Yucheng Chen | 2012 | Physica A:StatisticalMechanics and its Applications2012，391，7： | 1 |
| 14 | Studyon a lab-scale hydrogen production by closed cycle thermo-chemical iodine-sulfur process显示文摘 | Zhang Ping Chen Songhe Wang Laijun | 2010 | International Journalof Hydrogen Energy2010，35，10： | 1 |
| 15 | Development Trajectories in the Biotechnology Industry:China versus Leading Countries显示文摘现在的纸从一个全球观点检验中国的生物工学工业并且探索它的发展轨道怎么不同于是在生物工学的领导人的国家的。我们在多样的数据上绘画在中国表明工业的唯一的开发轨道。中国通过 R&D-oriented 外国直接投资的指向的副产品得益于全球化,在国内学术界和工业之间的鼓励政府的合作,和海外回国的人的输入的效果驾驶的发达国家。和独立革新上的政府和国内企业的一个增加的焦点,如此的开发使中国能赶上全球生物工学工业。然而,它为在中国的当前的规定和另外的障碍下面使革新商品化的小规模和低能力为工业的发展提出挑战。为中国的生物工学工业的持续发展的建议在这研究被介绍。 | Yantai Chen Laijun Luo Yaguang Zhang | 2011 | China & World Economy2011，19，3： | 1 |
| 16 | SIHR- rumor spreading mod- el in social networks显示文摘 | Laijun Zhao Jiajia Wang Yucheng Chen Qin Wang Jingjing Cheng Hongxin Cui | 2012 | Physica A: Statistical Mechanics and its Applications2012，7，391： | 1 |
| 17 | Comprehensive safety state assessment method of cuplok scaffolding显示文摘 | LIU LaiJun CHEN Yongrui Sun WeiGang | 2015 | Journal of Chang''an University ( Natural Science Edition)2015，35，3： | 1 |
| 18 | An Efficient Decomposition Method for Bilevel Energy Storage Arbitrage Problem显示文摘With the reduction of cost,large-capacity energy storage unit is playing an increasingly important role in modern power systems.When a merchant energy storage unit participates in the power market,its arbitrage problem can be modeled via a bilevel program.The lower-level problem simulates power market clearing and gives the nodal price,based on which the upperlevel problem maximizes the arbitrage profit of energy storage.To solve this bilevel problem,the conventional method replaces the lower level problem with its KKT optimality conditions and further performs linearization.However,because the size of the market clearing problem grows with the scale of the power system and the number of periods,the resulting MILP(mixed-integer linear program)is very challenging to solve.This paper proposes a decomposition method to address the bilevel energy storage arbitrage problem.First,the locational marginal price at the storage connection node is expressed as a piecewise constant function in the storage bidding strategy,so the market clearing problem can be omitted.Then,the storage bidding problem is formulated as a mixed-integer linear program,which contains only a few binary variables.Numeric experiments validate the proposed method is exact and highly efficient. | Danman Wu Tengyun Qi Wei Wei Jianping Liu Laijun Chen Shengwei Mei | 2022 | CSEE Journal of Power and Energy Systems2022，8，2： | 1 |
| 19 | The impact of key parameters on the cycle efficiency of multi-stage RCAES system显示文摘Due to the uncertainty and anti-peaking nature,large scale integration of renewable energy imposes great challenges to the operation and dispatch of power systems.Compressed air energy storage(CAES)system provides new ideas to solve this problem as its characteristics of fast regulating,flexible location and long-service life.Especially,regenerative compressed air energy storage(RCAES)system is widely concerned as its capability of heat recovery in the compression process.The cycle efficiency is a key indicator of RCAES system which can be significantly impacted by the key parameters of the systems including compression ratio,exhaust air pressure of throttle(EAPT)and the maximum working pressure(MWP)of compressed air storage vessel(CASV).However,current research mostly focuses on the thermodynamic process and few studies have focused on the impact of key parameters on RCAES system.Based on the efficiency evaluation method which was formulated through the electricalmechanical-thermal dynamic process and measurable parameters,the impact of key parameters on the cycle efficiency of RCAES system is analyzed in this paper and a practical RCAES design scheme is adopted for case study. | Bin LIU Laijun CHEN Shengwei MEI Feng LIU Junjie WANG Sixian WANG | 2014 | Journal of Modern Power Systems and Clean Energy2014，2，4： | 0 |
| 20 | Entropy regulation in LaNbO_(4)-based fergusonite to implement high-temperature phase transition and promising dielectric properties显示文摘High-entropy effect is a novel design strategy to optimize properties and explore novel materials.In this work,(La_(1/5)Nd_(1/5)Sm_(1/5)Ho_(1/5)Y_(1/5))NbO_(4)(5RNO)high-entropy microwave dielectric ceramics were successfully prepared in the sintering temperature(S.T.)range of 1210–1290℃via a solid-phase reaction route,and medium-entropy(La_(1/3)Nd_(1/3)Sm_(1/3))NbO_(4) and(La_(1/4)Nd_(1/4)Sm_(1/4)Ho_(1/4))NbO_(4)(3RNO and 4RNO)ceramics were compared.The effects of the entropy(S)on crystal structure,phase transition,and dielectric performance were evaluated.The entropy increase yields a significant increase in a phase transition temperature(from monoclinic fergusonite to tetragonal scheelite structure).Optimal microwave dielectric properties were achieved in the high-entropy ceramics(5RNO)at the sintering temperature of 1270℃for 4 h with a relative density of 98.2%and microwave dielectric properties of dielectric permittirity(ε_(r))=19.48,quality factor(Q×f)=47,770 GHz,and resonant frequency temperature coefficient(τ_(f))=–13.50 ppm/℃.This work opens an avenue for the exploration of novel microwave dielectric material and property optimization via entropy engineering. | Deqin Chen Na Yan Xuefeng Cao Fengrong Li Laijun Liu Qinghua Shen Huanfu Zhou Chunchun Li | 2023 | Journal of Advanced Ceramics2023，12，5： | 0 |
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