检索结果-南通市图书馆

Complex System Modeling and Simulation 2022年第4期2卷 354-367页

作者： Zhong Liao Zhaohua Liu Lei Chen Mingyang Lyu Dian Wang Faming Wu Zhengheng Wang Hualiang Wei the School of Information and Electrical Engineering Hunan University of Science and TechnologyXiangtan 411201China the wind power business division CRRC Zhuzhou Institute Co.Ltd.Zhuzhou 412001China. the Department of Automatic Control and Systems Engineering University of SheffieldSheffieldS13JDUK.

An integrated observer framework based mechanical parameters identification approach for adaptive control of permanent magnet synchronous motors is proposed in this ***,an integrated observer framework is established for mechanical parameters’estimation,which consists of an extended sliding mode observer(ESMO)and a Luenberger *** at minimizing the influence of parameters coupling,the viscous friction and the moment of inertia are obtained by ESMO and the load torque is identified by Luenberger observer *** obtaining estimates of the mechanical parameters,the optimal proportional integral(PI)parameters of the speed-loop are determined according to third-order best design *** a result,the controller can adjust the PI parameters in real time according to the parameter changes to realize the adaptive control of the ***,the disturbance is compensated according to the ***,the experiments were carried out on simulation platform,and the experimental results validated the reliability of parameter identification and the efficiency of the adaptive control strategy presented in this paper.

关键词： parameter identification permanent magnet synchronous motor adaptive control extended sliding mode observer Luenberger observer

Electrical resistivity-temperature characteristics enhancement of insulating cross-linked polyethylene composites by incorporating positive temperature coefficient particles with different Curie temperatures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Voltage 2023年第1期8卷 1-11页

作者： Guimin Jiang Yuanxiang Zhou Chenyuan Teng Yunxiao Zhang Xin Huang Lei Xue Luming Zhou The wind Solar Storage division of State Key Laboratory of Control and Simulation of power System and Generation Equipment Xinjiang UniversityUrumqiChina State Key Laboratory of power System and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijingChina College of Information Engineering Zhejiang University of TechnologyHangzhouChina School of Electronics and Computer Science University of SouthamptonSouthamptonUK

Incorporating positive temperature coefficient(PTC)ceramic particles into polymers provides a prospective alternative solution for suppressing severe electric field distortions caused by negative temperature coefficient(NTC)of electrical resistivity within polymer insulation in high voltage direct current *** effect of the Curie temperature of PTC particles on the inhibition of the NTC effect of cross-linked polyethylene(XLPE)is investigated in this *** temperature coefficient particles with varied Curie temperatures are surface-modified and melt blending with *** modified particles are dispersed on averagely in the *** electrical resistivity,space charge behaviour,and direct current(DC)electrical breakdown strength of the samples are investigated at different temperatures,exploring the effect of the Curie temperature of PTC particles on suppressing the NTC effect of *** is demonstrated that the reduction in Curie temperature can further suppress the NTC effect of XLPE,enhance the DC strength at elevated temperatures,and inhibit the internal space charge *** reduction in the Curie temperatures means that the initiation of the PTC effect advances,exhibiting a higher potential barrier and inhibiting the NTC effect more *** work may give a reference for improving the temperature stability of DC properties for XLPE cable insulation.

关键词： coefficient resistivity insulation

Grouping-Based Optimal Design of Collector System Topology for a Large-Scale Offshore wind Farm by Improved Simulated Annealing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Protection and Control of Modern power Systems 2024年第1期9卷 94-111页

作者： Ruilin Chen Zeyu Zhang Junxuan Hu Lei Zhao Chuangzhi Li Xiaoshun Zhang Shantou University ShantouChina ZHONGNAN ENGINEERING CORPORATION LIMITED North China Electric power University Department of Electronic and Information Engineering College of EngineeringShantouUniversityShantouChina Sichuan university ChengduChina Foshan Graduate School Northeastern UniversityFoshan 528311China College of Information Science and Engineering Northeastern UniversityShenyang 110819China

During the construction of an offshore wind farm(OWF),the capital cost of the collector cable system accounts for a large proportion of the total ***,the optimal design of the collector system topology(CST)is one of the most crucial tasks in OWF ***,for a large-scale OWF,the optimal design of CST is a complex integer programming problem with high-dimension variables and various ***,it is difficult to acquire a high-quality optimal design *** address this issue,this paper proposes a new grouping-based optimal design of CST for a large-scale ***,all the wind turbines are divided into multiple groups according to their geographical locations and the maximum allowed connected wind turbines by each *** not only reduces the optimization dimension and difficulty,but also effectively satisfies the‘no cross’constraint by putting the geographically closed wind turbines into the same ***,the electrical topology among different wind turbines in each group is initially generated by an improved dynamic minimum spanning tree(DMST).The division groups of the OWF are then adjusted to further reduce the capital cost by improved simulated *** verify the proposed technique,comparison case studies are carried out with five algorithms on two different OWF.

关键词： dimension Optimal initially

Energy Storage in High Variable Renewable Energy Penetration power Systems:Technologies and Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of power and Energy Systems 2023年第6期9卷 2099-2108页

作者： Huan Zhu Hu Li Guojing Liu Yi Ge Jing Shi Hai Li Ning Zhang State Grid Jiangsu Electric power Co. LtdNanjingChina Economic Research Institute of State Grid Jiangsu Electric power Company NanjingChina the State Key Laboratory of power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

Integrating variable renewable energy is one of the most effective ways to achieve a low-carbon energy *** high penetration of variable renewable energy,such as wind power and photovoltaic,increases the challenge of balancing the power *** storage technology is regarded as one of the key technologies for balancing the intermittency of variable renewable energy to achieve high *** study reviews the energy storage technology that can accommodate the high penetration of variable renewable *** basic energy storage technologies that can accommodate time-scale variation are reviewed *** role of energy storage in the generation,transmission,distribution,and consumption for the high variable renewable energy penetration system is then *** supporting energy storage policies in the United States,the United Kingdom and China are *** suggestions are proposed from the perspectives of technology,business and *** paper provides guidelines for planning energy storage to enable a high variable renewable energy penetration power system.

关键词： Application scenarios energy storage penetration renewable energy supporting policies

Development of Vehicle-to-Grid Systemto Regulate the System Parameters of Microgrid

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy Engineering 2022年第4期119卷 1261-1298页

作者： Om PrakashMahela Baseem Khan Rupendra Kumar Pachauri power System Planning division Rajasthan Rajya Vidyut Prasaran NigamLtd.Vidyut BhawanJapurIndia Department of Electrical and Computer Engineering Hawassa UniversityHawassaEthiopia Electrical Engineering Department School of EngineeringUniversity of Petroleum and Energy StudiesDehradunIndia

This paper proposes a vehicle-to-grid(V2G)system interfaced with a microgrid that is effective at regulating frequency on a microgrid over a 24-h cycle.A microgrid is designed and divided into four *** first component is a diesel generator,which is used to act as the base power *** second component consists of renewable energy(RE)power plants,which include solar photovoltaic(PV)and wind *** third component is a V2G *** last component is the load connected to the microgrid.A microgrid is designed to be of sufficient size to represent a community of one thousand households during the day period of low consumption in the spring or fall seasons.A hundred electric vehicles(EVs)are modeled as base models to realize a 1:10 ratio for cars to households,which indicates a possible scenario in the near *** analysis of the active power,reactive power,voltage,frequency,and current is carried *** is established that the proposed design of the V2G andmicrogrid effectivelymaintains systemparameters such as frequency and voltage within permissible limits with an error of less than 1%.Further,transient deviations in these parameters are limited to within 5%.A microgrid with V2G devices regulates the system frequency by mitigating load demand through coordinated control of conventional generation,solar PV plant generation,wind plant generation,power exchange with the microgrid network,and electric *** proposed microgrid and V2G are efficient for energy management and mitigation of intermittency and variability of RE power with improved *** in system parameters have been investigated by changing the operating scenario,and it has been determined that the error is limited to less than 5%.The study is effectively realized in the MATLAB/Simulink environment.

关键词： Microgrid electric vehicles vehicle-to-grid renewable energy PV wind

Protection Challenges Under Bulk Penetration of Renewable Energy Resources in power Systems:A Review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of power and Energy Systems 2017年第4期3卷 365-379页

作者： Vishnuvardhan Telukunta Janmejaya Pradhan Anubha Agrawal Manohar Singh power Systems division Central Power Research InstituteBengaluru 560080India R V College of Engineering Bengalure 560059India

Among different sources of alternate energy,wind and solar are two prominent and promising alternatives to meet the future electricity needs for ***,these sources are integrated at the distribution utilities to supply the local distribution *** the power generated by these sources is bulk,then they are either integrated at the distribution/transmission level or may be operated in an island mode if *** integration of these renewables in the power network will change the fault level and network *** fault levels are intermittent in nature and existing protection schemes may fail to operate because of their pre-set ***,the design and selection of a proper protection scheme is very much essential for reliable control and operation of renewable integrated power *** upon the level of infeed and location of the renewable integration,the protection requirements are *** low renewable infeed at the distribution level,the existing relay settings are immune from any small change in the network fault current from new incoming ***,bulk renewable infeed requires modification in the existing protection schemes to accommodate the fault current variation from the incoming *** bulk penetration of the renewable,the requirement of modified/additional protection schemes is *** relaying and non-adaptive relaying schemes are discussed in the literature for protection of power networks,which are experiencing dynamic fault currents and frequent changing network *** article presents a detailed review of protection schemes for renewable integrated power networks which includes distribution,transmission and microgrid *** merits and demerits of these protection schemes are also identified in this article for the added interest of the *** visible scope of advance protection schemes which may be suitable for providing reliable protection for dyn

关键词： Adaptive relaying distribution systems distance protection doubly fed induction generator microgrid protection renewable energy source

Evaluation and Forecasting of wind Energy Investment Risk along the Belt and Road Based on a Novel Hybrid Intelligent Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2021年第9期128卷 1069-1102页

作者： Liping Yan Wei-Chiang Hong Department of Economic Management North China Electric Power UniversityBaoding071000China Department of Industrial and business Management Chang Gung UniversityTaoyuanTaiwan

The timely and effective investment risk assessment and forecasting are of great significance to ensure the investment safety and sustainable development of wind energy along the Belt and *** order to obtain the scientific and real-time forecasting result,this paper constructs a novel hybrid intelligent model based on improved cloud model combined with GRA-TOPSIS and ***,the factors influencing investment risk of wind energy along the Belt and Road are identified fromthree dimensions:endogenous risk,exogenous risk and process *** the fuzzy threshold method,the final input index system is ***,the risk evaluation method based on improved cloud model andGRA-TOPSIS is ***,a modern intelligent model based on MBA-WLSSVMis *** modified bat algorithm(MBA),tent chaotic map is utilized to improve the basic bat algorithm,while weighted least squares support vector machine(WLSSVM)adopts wavelet kernel function to replace the traditional radial basis function to complete the model ***,an example is given to verify the scientificity and accuracy of themodel,which is helpful for investors tomake fast and effective investment risk forecasting of wind energy along the Belt and *** example analysis proves that the proposedmodel can provide reference and basis for investment corpus to formulate the investment strategy in wind energy along the Belt and Road.

关键词： The belt and road wind power industry investment risk evaluation improved cloud model GRA TOPSIS WLSSVM MBA

A semi-physical sediment yield model for estimation of suspended sediment in loess region

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2017年第1期32卷 12-19页

作者： Wei Si Weimin Bao Peng Jiang Liping Zhao Simin Qu business School of Hohai University College of Hydrology and Water Resources Hohai University division of Hydrologic Sciences Desert Research Institute

Sediment yield is a complex function of many environmental factors including climate,hydrology,vegetation,basin topography,soil types,and land *** present a new semi-physical watershed sediment yield model for the estimation of suspended sediment in loess *** model is composed by three modules in slope,gully,and stream *** slope sediment yield,a balance equation is established based on the concept of hydraulic erosion capacity and soil erosion resistance *** to the statistical analysis of watershed characteristics,we use an exponential curve to approximately describe the spatial variability of watershed soil erosion resistance *** gully phase,the relationship between gully sediment concentration and flow velocity is established based on the Bagnold’ stream power *** the stream phase,we assume a linear dependence of the sediment volume in the reach on the weighted sediment input and *** proposed sediment yield model is operated in conjunction with a conceptual hydrologic model,and is tested over 16 regions including testing grounds,and small,medium and large watersheds in the loess plateau region in the mid-reach of Yellow *** results indicate that the model is reasonable in structure and is able to provide a good simulation of sediment generation and transportation processes at both flood event scale and inter-annual time *** proposed model is generally applicable to the watersheds with soil texture similar to that of the loess plateau region in the Yellow River basin in China.

关键词： Hydraulic erosion capacity Erosion resistance capacity Sediment yield Suspended sediment Loess region

Government involvement in banking systems and economic growth:a comparison across countries

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Economic and Political Studies 2019年第1期7卷 35-65页

作者： Wilson X.B.Li Tina T.He Stella P.L.Cho division of business and Management BNU-HKBU United International CollegeZhuhaiGuangdongChina

This study investigates 92 countries of different legal origins,including 25 English origin,44 French origin,11 Scandinavian and German origin,and 12 socialist origin *** to other countries,China has the highest government ownership of banks,and lies in the middle in terms of official supervisory power over banks,and government efficiency in *** regards economic development measured by per capita GDP growth,in the period from 1995 to 2015,China performed significantly better than all the other countries in the sample–countries varying in legal origin,government ownership of banks,level of economic and financial development,supervisory power over banks,and government *** findings are robust when we examine the country-years with similar per capita GDP as that of *** regression results show that in some circumstances,higher government ownership of banks is associated with higher economic growth and the positive association is more significant in socialist origin *** discussions suggest that the high government involvement in commercial banks fits in well with the unique characteristics of China–such as a large population,underdeveloped economy,imbalance in resources and development in different areas,as well as the utmost trust placed on the Chinese government and government owned banks–thus may benefit economic growth.

关键词： Economic growth government banking and finance legal origin China

Optimizing Decision-Making of A Smart Prosumer Microgrid Using Simulation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第7期76卷 151-173页

作者： Oussama Accouche Rajan Kumar Gangadhari College of Engineering and Technology American University of the Middle EastEgaila 54200Kuwait Operations and IT ICFAI Business SchoolHyderabad501203India

Distributed renewable energy sources offer significant alternatives for Qatar and the Arab Gulf region’s future fuel supply and *** are essential for providing dependable power in difficult-to-reach areas while incorporating significant amounts of renewable energy *** energy-efficient data centers,distributed generation can be used to meet the facility’s overall power *** study primarily focuses on the best energy management practices for a smart microgrid in Qatar while taking demandside load management into *** article looked into a university microgrid in Qatar that primarily aimed to get all of its energy from the *** diesel generators are categorized as a dispatchable distributed generation with energy storage added to handle solar radiation from the sun and high grid power operating costs in the suggested scenario,wind turbines and solar Photovoltaic(PV)are classified as non-dispatchable distributed *** resulting linear math issues are assessed and displayed in MATLAB optimization software using a mixed-integer linear programming(MILP)*** to the simulation results,the suggested energy management strategy reduced the university microgrid’s grid power costs by 38.8%,making it an affordable solution which is somehow greater than the prior case scenario’s 23%*** installed solar system capacity’s effects on the economy,society,and finances were also assessed,and it became clear that the best option for the smart microgrid was determined that would be 325 kW of solar PV,25 kW of wind turbine,and 600 kW of diesel generators,*** the current situation,university administrators are urged to participate in distributed generators and adopt cutting-edge designs for energy storage technologies due to the significant environmental and financial benefits.

关键词： Energy management smart grid prosumer demand-side load management renewable resources wind turbines