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Active Damping of Multi-paralleled Inverters with LCL Filters Based on Virtual Harmonic Resistance Control Strategy

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Active Damping of Multi-paralleled Inverters with LCL Filter...

第36届中国控制会议

作者： Laijun Chen Lifeng Li Tianwen Zheng Chunlai Li Yan Guo Shengwei Mei qinghai key lab of efficient utilization of clean energy(new energy photovoltaic industry research center Qinghai University) State key lab of Power System Department of Electrical EngineeringTsinghua University key laboratory of photovoltaic Power Generation and Grid-connected Technology qinghai Electrical Power research Institute Qinghai Electric Power Corporation

ISBN: (纸本)9781538629185

With the development and utilization of renewable energy,power electronic inverters are becoming more and more widely employed as the interfaces of renewable energy sources in modern power ***,because of the LCL filter,parallel-inverter-based grid-interactive system may experience serious resonance problems at different *** paper first develops a mathematical model of parallel-inverter-based grid-interactive *** resonance characteristic can then be investigated with the introduced *** improve the power quality,a virtual-harmonic-resistance-based active damping method is *** the traditional method,a virtual resistance is in parallel with the grid-side inductor of LCL filter in the proposed *** with a harmonic detector,the influence on fundamental wave control is greatly ***,the costs of the control system can be decreased because there is no need to involve any additional ***,simulation results on the platform of Matlab/Simulink are provided to validate the correctness of the developed resonance modeling and active damping method.

关键词： Inverters LCL filter Resonance Virtual Resistance Grid-interactive

Hierarchical energy Management for Economic Operation of Micro energy Internet Systems

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Hierarchical Energy Management for Economic Operation of Mic...

第36届中国控制会议

作者： Wei Liu Tianwen Zheng Zhenquan Sun Laijun Chen Lifeng Li Shengwei Mei Shaanxi Regional Electric Power Group Co.Ltd. State key lab of Power System Department of Electrical EngineeringTsinghua University qinghai key lab of efficient utilization of clean energy(new energy photovoltaic industry research center Qinghai University)

ISBN: (纸本)9781538629185

In this paper,the concept of micro energy internet is discussed *** achieve economic and environmental goal in the operation of micro energy internet,a hierarchical energy management system is proposed to handle the power flow exchanged between the micro energy internet and the host ***,the concept,characteristics and operational goals of micro energy internet is ***,a three-layer hierarchical optimization model concerning energy efficiency and environmental issue is proposed based on the game theory.A micro energy internet consists of an electricity network and thermal network is investigated and the effectiveness of the proposed management system is validated.

关键词： Hierarchical energy management Micro energy internet Multi objective functions

Capacity Allocation of Hybrid Power System with Hot Dry Rock Geothermal energy,Thermal Storage,and PV Based on Game Approaches

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Journal of Modern Power Systems and clean energy 2023年第1期11卷 290-301页

作者： Yang Si Laijun Chen Xuelin Zhang Xiaotao Chen Shengwei Mei qinghai key lab of efficient utilization of clean energy(Tus-Institute for Renewable energy) University of QinghaiXining 810016China State key laboratory of Control and Simulation of Power System and Power Generation Equipment(Electric Machinery Department Tsinghua University)Beijing 100084China Technical Institute of Physics and Chemistry Beijing 100190China IEEE

This study utilizes hot dry rock(HDR)geothermal energy,which is not affected by climate,to address the capacity allocation of photovoltaic(PV)-storage hybrid power systems(HPSs)in frigid plateau *** study replaces the conventional electrochemical energy storage system with a stable HDR plant assisted by a flexible thermal storage(TS)*** HPS consisting of an HDR plant,a TS plant,and a PV plant is *** approaches are introduced to establish the game pattern model of the proposed HPS as the *** annualized income of each player is used as the payoff ***,non-cooperative game and cooperative game approaches for capacity allocation are proposed according to the interests of each player in the proposed ***,the proposed model and approaches are validated by performing calculations for an HPS in the Gonghe Basin,qinghai,China as a case *** results show that in the proposed non-cooperative game approach,the players focus only on the individual payoff and neglect the overall system *** proposed cooperative game approach for capacity allocation improves the flexibility of the HPS as well as the payoff of each game ***,the HPS can better satisfy the power fluctuation rate requirements of the grid and increase the equivalent firm capacity(EFC)of PV plants,which in turn indirectly guarantees the reliability of grid operation.

关键词： Capacity allocation equivalent firm capacity game theory hot dry rock hybrid power system

Pinning Consensus Based Control with Fast Convergence for Isolated Microgrids Considering Communication Time Delays

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Pinning Consensus Based Control with Fast Convergence for Is...

第37届中国控制会议

作者： Sicheng Deng Tianwen Zheng Yang Si Laijun Chen Shengwei Mei State key lab of Power System Department of Electrical EngineeringTsinghua University qinghai key lab of efficient utilization of clean energy (qinghai University Tus-Institute for Renewable energy)

Distributed control methods are widely employed in AC microgrids because of the robustness and flexibility. As a necessary part of the distributed control system, the communication network plays an important role in the microgrids. Communication time delays are unavoidable in communication networks. This paper focuses on the influence of communication time delays in microgrids. A traditional pinning consensus based control strategy for active power sharing in microgrids is investigated and the impact of communication time delays is analyzed. To speedup the convergence rate, a modified control strategy is proposed. With the same communication time delay, the modified strategy converges faster than the traditional strategy. Also,microgrids with the modified strategy could stand a larger time delay without losing stability. The effectiveness of the modified strategy is verified by simulation results.

关键词： Microgrid Active power sharing Pinning consensus Communication time delay

Consensus-Based Distributed Control for Reactive Power Sharing in Autonomous Microgrid under Communication Noises

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Consensus-Based Distributed Control for Reactive Power Shari...

第37届中国控制会议

作者： Yuyang Wang Laijun Chen Chunlai Li Tianwen Zheng Libing Yang Shengwei Mei State key lab of Power System Department of Electrical Engineering Tsinghua University qinghai key lab of efficient utilization of clean energy (qinghai University Tus-Institute for Renewable energy) key laboratory of photovoltaic Power Generation and Grid-connected Technology (qinghai Electrical Power research Institute Qinghai Electric Power Corporation)

Distributed control relies on communication network among distributed generators（DGs）, which is commonly influenced by noises. Furthermore, reactive power deviations may be deteriorated under different communication noises. In this paper, an improved consensus-based distributed control considering communication noises is developed in AC autonomous microgrids, which is capable of attenuating the impact of noises. The traditional consensus-based distributed control is introduced and noises are also considered in traditional control. In order to attenuate the influence of noises, a consensus gain function is involved, which can attenuate the impacts in reactive power sharing. By using this proposed method, the proportional reactive power sharing is achieved under noises. Simulation results verify the effectiveness of the proposed method.

关键词： microgrid distributed control reactive power sharing consensus gain function communication noises

Catalyst design strategy toward the efficient heterogeneously-catalyzed selective oxidation of 5-hydroxymethylfurfural

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Green energy & Environment 2022年第5期7卷 900-932页

作者： Huai Liu Xing Tang Xianhai Zeng Yong Sun Xixian Ke Tianyuan Li Jiaren Zhang Lu Lin BiomassChem Group Faculty of Chemical EngineeringKunming University of Science and TechnologyKunming650500China Xiamen key laboratory of clean and High-valued utilization for Biomass College of EnergyXiamen UniversityXiamen361102China Fujian Engineering and research center of clean and High-valued Technologies for Biomass Xiamen UniversityXiamen361005China key lab for Sport Shoes Upper Materials of Fujian Province(Fujian Huafeng new Material Co. Ltd.)Putian351144China PetroChina Petrochemical research Institute Beijing102206China

The selective oxidation of 5-hydroxymethylfurfural(HMF),a versatile bio-based platform molecule,leads to the formation of several intriguing and useful downstream chemicals,such as 2,5-diformylfuran(DFF),5-hydroxymethyl-2-furancarboxylic acid(HMFCA),formyl 2-furancarboxylic acid(FFCA),2,5-furandicarboxylic acid(FDCA) and furan-2,5-dimethylcarboxylate(FDMC).These products have been extensively employed to fabricate novel polymers,pharmaceuticals,sustainable dyes and many other value-added fine *** heart of the developed HMF oxidation processes is always the *** this regard,this review comprehensively summarized the established heterogeneous catalyst design strategy for the selective oxidation of HMF via *** attention has been focused on the reaction mechanism of HMF oxidation over different catalysts as well as enhancing the catalytic performance of the catalyst through manipulating the properties of the support and fabricating of multi-component metal nano-particles and *** current challenges and possible research directions for the catalytic oxidation of HMF in the future are also discussed.

关键词： hydroxymethyl catalyst catalyzed

Effective production of γ-valerolactone from biomass-derived methyl levulinate over CuO_x-CaCO_3 catalyst

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Chinese Journal of Catalysis 2019年第2期40卷 192-203页

作者： Xuejuan Cao Huai Liu Junnan Wei Xing Tang Xianhai Zeng Yong Sun Tingzhou Lei Geng Zhao Lu Lin Xiamen key laboratory of clean and High-valued utilization for Biomass College of EnergyXiamen UniversityXiamen 361102FujianChina Fujian Engineering and research center of clean and High-valued Technologies for Biomass Xiamen 361005FujianChina Henan key lab of Biomass energy Zhengzhou 450008HenanChina College of Chemistry and Chemical Engineering Xinyang Normal UniversityXinyang 464000HenanChina

The production of?-valerolactone(GVL)from lignocellulosic biomass has become a focus of research owing to its potential applications in fuels and *** this study,(n)CuOx-CaCO3(where n is the molar ratio of Cu to Ca)compounds were prepared for the first time and shown to function as efficient bifunctional catalysts for the conversion of biomass-derived methyl levulinate(ML)into GVL,using methanol as the in-situ hydrogen *** the catalysts with varied Cu/Ca molar ratios,(3/2)CuOx-CaCO3 provided the highest GVL yield of 95.6% from *** incorporation of CaCO3 with CuO resulted in the formation of Cu+species in a CuOx-CaCO3 catalyst,which greatly facilitated the hydrogenation of ***,CuOx-CaCO3 also displayed excellent catalytic performance in the methanolysis products of cellulose,even in the presence of ***,a facile two-step strategy for the production of GVL from cellulose could be developed over this robust and inexpensive catalyst,through the integration of cellulose methanolysis catalyzed by sulfuric acid,methanol reforming,and ML hydrogenation in methanol medium.

关键词： γ-Valerolactone Methyl levulinate Hydrocyclization Methanol reforming Cellulose methanolysis

Highly efficient electrocatalytic nitrogen fixation enabled by the bridging effect of Ru in plasmonic nanoparticles

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Nano research 2023年第1期16卷 360-370页

作者： Hang Yin Jinwu Hu Caihong Fang Yuyang Wang Lixia Ma Nan Zhang Shouren Zhang Ruibin Jiang Jianfang Wang Shaanxi key laboratory for Advanced energy Devices Shaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119China College of Chemistry and Materials Science The Key Laboratory of Functional Molecular SolidsMinistry of EducationAnhui Laboratory of Molecular-Based MaterialsCenter for Nano Science and TechnologyKey Laboratory of Electrochemical Clean Energy of Anhui Higher Education InstitutesAnhui Normal UniversityWuhu 241000China Henan Provincial key laboratory of Nanocomposites and Applications Institute of Nanostructured Functional MaterialsHuanghe Science and Technology CollegeZhengzhou 450006China Department of Physics The Chinese University of Hong KongHong Kong 999077China

Plasmon-generated hot electrons show great potential for driving chemical *** utilization efficiency of hot electrons is highly dependent on the interaction of the electronic states at the interfaces between plasmonic nanoparticles and other materials/*** interaction can produce new hybridized electron states,which permit direct hot-electron transfer,a more efficient transfer ***,Au usually has very weak interaction with most molecules because of its inertness,which makes direct hot-electron transfer ***,the improvement of the hot-electron transfer efficiency from Au to N_(2)is demonstrated by introducing a Ru bridging *** the N_(2)fixation rate and Faradic efficiency(FE)are enhanced by the excitation of *** enhancement of the N_(2)fixation rate is found to arise from plasmon-generated hot *** calculations show that the strong interaction of the Ru electronic states with the N_(2)molecular orbitals produces new hybridized electronic states,and the Ru d electrons also strongly couple with the Au sp *** a bridging role of Ru makes direct hot-electron transfer from Au to N_(2)possible,improving the FE of nitrogen *** findings demonstrate a new approach to increasing the utilization efficiency of plasmonic hot electrons for chemical reactions and will be helpful to the design of plasmonic catalysts in the future.

关键词： electrocatalytic nitrogen fixation Au/Ru electrocatalysts localized surface plasmon resonance electronic state hybridization hot electron

The first power generation test of hot dry rock resources exploration and production demonstration project in the Gonghe Basin,qinghai Province,China

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China Geology 2022年第3期5卷 372-382页

作者： Er-yong Zhang Dong-guang Wen Gui-ling Wang Wei-de Yan Wen-shi Wang Cheng-ming Ye Xu-feng Li Huang Wang Xian-chun Tang Wei Weng Kuan Li Chong-yuan Zhang Ming-xing Liang Hong-bao Luo Han-yue Hu Wei Zhang Sen-qi Zhang Xian-peng Jin Hai-dong Wu Lin-you Zhang Qing-da Feng Jing-yu Xie Dan Wang Yun-chao He Yue-wei Wang Zu-bin Chen Zheng-pu Cheng Wei-feng Luo Yi Yang Hao Zhang En-lai Zha Yu-lie Gong Yu Zheng Chang-sheng Jiang Sheng-sheng Zhang Xue Niu Hui Zhang Li-sha Hu Gui-lin Zhu Wen-hao Xu Zhao-xuan Niu Li Yang center for Hydrogeology and Environmental Geology Survey China Geological SurveyMinistry of Natural ResourcesBaoding 071051China Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesChina Geological SurveyShijiazhuang 050061China Department of Natural Resources of qinghai Province Xining 810001China Institute of Exploration Techniques Chinese Academy of Geological SciencesChina Geological SurveyLangfang 065000China Department of Hydrogeology and Environmental Geology China Geological SurveyMinistry of Natural ResourcesBeijing 100037China Chinese Academy of Geological Sciences China Geological SurveyBeijing 100037China Beijing Institute of Exploration Engineering China Geological SurveyMinistry of Natural ResourcesBeijing 100083China Institute of Geomechanics Chinese Academy of Geological SciencesChina Geological SurveyBeijing 100081China Institute of Geophysical and Geochemical Exploration Chinese Academy of Geological SciencesChina Geological SurveyLangfang 065000China Institute of Exploration Technology Chinese Academy of Geological SciencesChina Geological SurveyChengdu 611734China Geoscience Documentation center China Geological SurveyMinistry of Natural ResourcesBeijing 100083China Jilin University Changchun 130012China Oil and Gas Survey China Geological SurveyMinistry of Natural ResourcesBeijing 100083China Guangzhou Institute of energy Conversion Chinese Academy of SciencesGuangzhou 510640China Institute of Geophysics China Earthquake AdministrationBeijing 100081China Institute of the Hydrogeology and Engineering Geology of qinghai Xining 810008China

Hot dry rock(HDR)is a kind of clean energy with significant *** the 1970s,the United States,Japan,France,Australia,and other countries have attempted to conduct several HDR development research projects to extract thermal energy by breaking through key ***,up to now,the development of HDR is still in the research,development,and demonstration *** HDR exploration borehole(with 236℃ at a depth of 3705 m)was drilled into Triassic granite in the Gonghe Basin in northwest China in ***,China Geological Survey(CGS)launched the HDR resources exploration and production demonstration project in *** three years of efforts,a sequence of significant technological breakthroughs have been made,including the genetic model of deep heat sources,directional drilling and well completion in high-temperature hard rock,large-scale reservoir stimulation,reservoir characterization,and productivity evaluation,reservoir connectivity and flow circulation,efficient thermoelectric conversion,monitoring,and geological risk assessment,*** the whole-process technological system for HDR exploration and production has been preliminarily established *** first power generation test was completed in November *** results of this project will provide scientific support for HDR development and utilization in the future.

关键词： Hot dry rock Directional drilling Reservoir stimulation Microseismic monitoring Organic Rankine cycle(ORC) Power generation test energy geological survey engineering Gonghe Basin qinghai Province China