检索结果-南通市图书馆

Modelling and Temperature Control of Liquid Cooling Process for Lithium-Ion Battery

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第5期33卷 1794-1808页

作者： LI Guanru ZHONG Yangfan BAO Chujin CHEN Yongping zhang chengbin School of Energy and Environment Southeast UniversityNanjing 210096China Key Laboratory of Efficient Low-Carbon Energy Conversion and Utilization of Jiangsu Provincial Higher Education Institutions Suzhou University of Science and TechnologySuzhou 215009China Alibaba Cloud Computing Co.Ltd. Hangzhou 311121China Zhejiang Immertech Co.Ltd. Hangzhou 310000China

Efficient thermal management of lithium-ion battery,working under extremely rapid charging-discharging,is of widespread interest to avoid the battery degradation due to temperature rise,resulting in the enhanced ***,thermal management of lithium-ion battery has been performed via a liquid cooling theoretical model integrated with thermoelectric model of battery packs and single-phase heat *** to alleviate the battery temperature fluctuation by automatically manipulating the flow rate of working fluid,a nominal model-free controller,i.e.,fuzzy logic controller is *** optimized on-off controller based on pump speed optimization is introduced to serve as the comparative *** control simulations are conducted under regular operating and extreme operating conditions,and two controllers are applied to control battery temperature with proper intervals which is conducive to enhance the battery charge-discharge *** results indicate that,for any operating condition,the fuzzy logic controller shows excellence in terms of the tracking accuracy of set-point of battery *** to the establishment of fuzzy set and fuzzy behavioral rules,the battery temperature has been throughout maintained near the set point,and the temperature fluctuation amplitude is highly reduced,with better temperature control accuracy of~0.2℃(regular condition)and~0.5℃(extreme condition)compared with~1.1℃(regular condition)and~1.6℃(extreme condition)of optimized on-off *** in the case of extreme operating condition,the proposed optimized on-off controller manifests the hysteresis in temperature fluctuation,which is ascribed to the set of dead-band for the feedback *** simulation results cast new light on the utilization and development of model-free temperature controller for the thermal management of lithium-ion battery.

关键词： temperature control battery thermal management model-free controller fuzzy logic control

A Multi-Channel CMOS Analog Front-End Interface IC with 157.8 d B Current Detection Dynamic Range

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2024年第2期33卷 393-402页

作者： Kunyu WANG Wenjing XU chengbin zhang Yanjun YANG Man-Kay LAW Li ZHOU Jie CHEN Ming CHEN Institute of Microelectronics of the Chinese Academy of Science University of Chinese Academy of Sciences Zunyi Normal University Institute of Microelectronics and Dept.of ECE FST University of Macau

A high dynamic range and low-noise CMOS(complementary metal-oxide-semiconductor transistor)front-end interface integrated circuit(IC) with multi-channel detection is presented in this paper. Two different current detection channels, composed of a trans-impedance amplifier(TIA) and an integrator-differentiator TIA, are used to boost the current detection range. A capacitance-coupled instrument amplifier(CCIA) is also included to realize high precision voltage detection. A fourth-order sigma-delta modulator using a second-order loop filter and a second-order noise shaping integral quantizer is adopted to realize effective number of bits above 16 bits. The presented interface IC is implemented in 0.18-μm CMOS process with supply voltage of 3.3 V, and a proto-type electrochemical sensor platform with miniaturized sensor array is developed to verify the functionality of the interface IC. Measurement results indicate that the designed interface IC achieves 157.8 d B current detection dynamic range, and the measured input-referred current noise and voltage noise floor are 1.04 p A and 58.4 n V within 10 k Hz integration bandwidths,respectively.

关键词： Integrated circuits Sigma-delta modulation Semiconductor device measurement Voltage measurement Current measurement Noise Bandwidth

基于反事实多智能体强化学习和有功无功协同控制的配电网电压优化

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

电力系统保护与控制 2024年第18期52卷 76-86页

作者：张梓枭崔明建张程彬张剑蔡木良周求宽天津大学电气自动化与信息工程学院天津300072 合肥工业大学电气与自动化工程学院安徽合肥230009 国网江西省电力有限公司电力科学研究院江西南昌330096

大量分布式电源的接入使配电网的结构与控制方式发生改变。针对分布式电源间歇性和波动性引起的电压越限问题,通过调节系统中无功潮流与有功潮流的分布来维持配电网的电压稳定。提出了一种基于反事实多智能体策略梯度(counterfactual mu... 详细信息

大量分布式电源的接入使配电网的结构与控制方式发生改变。针对分布式电源间歇性和波动性引起的电压越限问题,通过调节系统中无功潮流与有功潮流的分布来维持配电网的电压稳定。提出了一种基于反事实多智能体策略梯度(counterfactual multi-agent policy gradients, COMA)算法的配电网电压协同优化方法,通过反事实基线解决了多智能体强化学习中的“信度分配”问题,实现有功出力设备和无功补偿设备的联合优化调度。智能体通过局部观测值选定动作,减轻系统的通信压力,且不依赖精确的潮流模型,以实现配电网的实时优化控制。通过改进的IEEE33节点系统和141节点系统验证了所提算法的可行性与有效性。并与经典算法的控制效果进行比较,进一步证明所提算法在配电网电压优化控制方面的性能优势。

关键词：配电网有功无功协同优化多智能体深度强化学习分布式电源

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

立体平板热管强化温差发电性能的实验研究

动力工程学报 2024年第6期44卷 905-910页

作者：李大树丁奕文张程宾中国石油大学(北京)机械与储运工程学院过程流体过滤与分离技术北京市重点实验室北京102249 苏州科技大学江苏省微纳热流技术与能源应用重点实验室江苏苏州215009 东南大学能源与环境学院南京210096

为提升温差发电装置的发电效率,提出了一种立体平板热管强化性能方法,通过实验对比评估了2种充液率对该立体平板热管均热性能的影响,探究了不同温差下温差发电系统的最大输出功率和发电效率。结果表明:充液率为27.4%时立体平板热管启动... 详细信息

为提升温差发电装置的发电效率,提出了一种立体平板热管强化性能方法,通过实验对比评估了2种充液率对该立体平板热管均热性能的影响,探究了不同温差下温差发电系统的最大输出功率和发电效率。结果表明:充液率为27.4%时立体平板热管启动过程为分段启动,且温度分层现象明显;充液率为31.7%时立体平板热管可在40℃左右时迅速启动,启动后温度分布均匀性和一致性较好,有利于温差发电系统持续稳定高效发电;基于立体平板热管强化的温差发电系统的最大输出功率和发电效率均随着冷热端温差的增大而增大,且温差发电效率最高可达3.99%。

关键词：立体平板热管温差发电充液率温差

在线全文

学校读者我要写书评

暂无评论

麦稻复种机械化高产高效栽培技术

天津农林科技 2024年第5期 28-31页

作者：张成斌芦台经济开发区农业总公司河北唐山301505

为发展粮食生产,优化农业种植结构,文章通过提高土地复种指数,增加粮食作物播种面积和产量,提出了麦稻复种机械化高产高效栽培技术,实现春小麦和麦茬稻一年两茬高产高效。2023年在河北省唐山市芦台经济开发区开展水旱轮作麦稻复种示范,... 详细信息

为发展粮食生产,优化农业种植结构,文章通过提高土地复种指数,增加粮食作物播种面积和产量,提出了麦稻复种机械化高产高效栽培技术,实现春小麦和麦茬稻一年两茬高产高效。2023年在河北省唐山市芦台经济开发区开展水旱轮作麦稻复种示范,其中春小麦平均单产410 kg·667 m^(-2),麦茬稻平均单产650 kg·667 m^(-2),两茬合计全年总产量1060 kg·667 m^(-2),纯效益1031.00元·667 m^(-2),比单季稻增收507.00元·667 m^(-2),麦稻复种面积820.6 hm^(2),总增收416万元。本示范结果表明,实行麦稻水旱轮作机械化高产高效栽培技术,可优化生态环境,有利于用地养地和高效利用土地,提高作物单位面积产量,有利于农业可持续发展。

关键词：麦稻复种高产高效栽培技术

维普期刊数据库博看期刊

Improving the performance of a thermoelectric power system using a flat-plate heat pipe

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2019年第1期27卷 44-53页

作者： Suchen Wu Yiwen Ding chengbin zhang Dehao Xu Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast University Nanjing ACME Electronics Cooling Service Inc.

A gravitational flat-plate heat pipe is designed and fabricated in this paper to serve as a heat spreader to diffuse the local heat source to the hot side of the thermoelectric power *** on this, an experimental test for the thermoelectric power generation system is conducted to study the influences of the heat spreader on the temperature uniformity and power generation performance when exposing to a local heat *** addition,the effects of the heating power, inclination angle, and local heat source size on the power generation performance of the thermoelectric power module using a flat-plate heat pipe as a heat spreader are examined and compared with that using a metal *** results indicate that the gravitational flat-plate heat pipe has considerable advantages over the metal plate in the temperature *** superiority of temperature uniformity in the improvement of power generation performance for the thermoelectric power system using a heat pipe is ***, the heat pipe shows good adaptability to placement mode and the local heat source size, which is beneficial to the application in the thermoelectric power generation.

关键词： Thermoelectric Heat pipe Heat spreader Power generation

基于深度强化学习面向虚假拓扑攻击和拓扑优化的电网调度方法

在线全文

学校读者我要写书评

暂无评论

智慧电力 2024年第3期52卷 25-31页

作者：韩一宁张程彬郭敏嘉赵男崔明建天津大学电气自动化与信息工程学院天津300072 国网太原供电公司山西太原030012 云南电网有限责任公司电力科学研究院云南昆明650214

随着高比例可再生能源的接入和虚假拓扑攻击的频率不断增加,传统的电网控制方法和发电出力调整调度方法已经难以满足电力系统运行的需要。因此,设计并实现了一种基于深度强化学习面向虚假拓扑攻击和拓扑优化的电网调度方法,使智能体能... 详细信息

随着高比例可再生能源的接入和虚假拓扑攻击的频率不断增加,传统的电网控制方法和发电出力调整调度方法已经难以满足电力系统运行的需要。因此,设计并实现了一种基于深度强化学习面向虚假拓扑攻击和拓扑优化的电网调度方法,使智能体能够在正常的负荷波动以及随机发生的拓扑攻击影响下,通过深度强化学习方法决策并执行调整电网拓扑结构的动作,提高电力系统运行的安全性。最后,基于IEEE 14节点系统数据的仿真验证了所提方法的有效性。

关键词：电力系统运行深度强化学习拓扑结构优化虚假拓扑攻击

绿色技术溢出对晋陕蒙煤炭行业碳排放强度影响路径分析

在线全文

学校读者我要写书评

暂无评论

中国煤炭 2024年第3期50卷 27-38页

作者：苏红梅张成斌王彩霞韩丽萍内蒙古工业大学经济管理学院内蒙古自治区呼和浩特市010050 内蒙古现代物流与供应链管理研究中心内蒙古自治区呼和浩特市010050 内蒙古互联网经济研究中心内蒙古自治区呼和浩特市010050

我国煤炭生产消费过程的碳排放占总量的70%~80%,晋陕蒙地区煤炭生产消费占全国的60%左右,因此,对晋陕蒙地区煤炭行业进行碳排放强度影响路径分析具有重要意义。运用DDF与Global-Malmquist-Luenberger指数相结合的方式测算晋陕蒙地区煤... 详细信息

我国煤炭生产消费过程的碳排放占总量的70%~80%,晋陕蒙地区煤炭生产消费占全国的60%左右,因此,对晋陕蒙地区煤炭行业进行碳排放强度影响路径分析具有重要意义。运用DDF与Global-Malmquist-Luenberger指数相结合的方式测算晋陕蒙地区煤炭行业绿色技术溢出,根据《IPCC国家温室气体指南》中公布的碳排放主要来源,通过层层分类的方法对晋陕蒙地区煤炭行业碳排放强度进行测算,并通过结构方程模型探究绿色技术溢出对碳排放强度的作用机制和影响路径。研究发现:2006-2021年间晋陕蒙地区煤炭行业绿色技术溢出呈现波动上升变化趋势和碳排放强度呈现倒“V”型变化趋势;晋陕蒙地区煤炭行业绿色技术溢出与碳排放强度显著负相关;绿色技术溢出通过经济发展水平、行业结构和从业人口数量等变量构成的3条影响路径降低晋陕蒙地区煤炭行业碳排放强度。

关键词：绿色技术溢出煤炭行业影响路径碳排放强度晋陕蒙地区

Numerical study on permeability characteristics of fractal porous media

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第5期29卷 368-376页

作者： Yongping Huang Feng Yao Bo Zhou chengbin zhang Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Environmental Science and EngineeringSuzhou University of Science and TechnologySuzhou 215009China

The fractal Brownian motion is utilized to describe pore structures in porous media. A numerical model of laminar flow in porous media is developed, and the flow characteristics are comprehensively analyzed and compared with those of homogeneous porous media. Moreover, the roles of the fractal dimension and porosity in permeability are quantitatively described. The results indicate that the pore structures of porous media significantly affect their seepage behaviors. The distributions of pressure and velocity in fractal porous media are both non-uniform;the streamline is no longer straight but tortuous. When Reynolds number Re < 1, the dimensionless permeability is independent of Reynolds number, but its further increase will lead to a smaller permeability. Moreover, due to the higher connectivity and enlarged equivalent aperture of internal channel network, the augment in porosity leads to the permeability enhancement, while it is small and insensitive to porosity variation when ε < 0.6. Fractal dimension also plays a significant role in the permeability of porous media. The increase in fractal dimension leads to the enhancement in pore connectivity and a decrease in channel tortuosity,which reduces the flow resistance and improves the transport capacity of porous media.

关键词： seepage fractal Brownian motion porous media fractal dimension