检索结果-南通市图书馆

基于充电站调频能力的虚拟同步发电机控制策略

在线全文

学校读者我要写书评

暂无评论

电网技术 2024年第6期48卷 2416-2425,I0045-I0048页

作者：丁乐言柯松杨军施兴烨彭晓涛林晓明梁柱交直流智能配电网湖北省工程中心湖北省武汉市430072 武汉大学电气与自动化学院湖北省武汉市430072 南方电网科学研究院有限责任公司广东省广州市510663 广东省电网智能量测与先进计量企业重点实验室广东省广州市510663 广东电网有限责任公司肇庆供电局广东省肇庆市526060

随着大量分布式电源的接入,微电网惯性水平显著降低,易导致频率失稳。而充电站(charging station,CS)内入网的电动汽车(electric vehicle,EV)可为电网提供辅助调频服务,基于此该文提出了一种基于CS调频能力的虚拟同步发电机(virtual syn... 详细信息

随着大量分布式电源的接入,微电网惯性水平显著降低,易导致频率失稳。而充电站(charging station,CS)内入网的电动汽车(electric vehicle,EV)可为电网提供辅助调频服务,基于此该文提出了一种基于CS调频能力的虚拟同步发电机(virtual synchronous generator,VSG)控制策略。首先,提出了基于CS调频功率的VSG控制架构,并基于用户充电需求,提出了反映EV调频能力的调频参与度因子计算方法;其次,提出了CS调频功率可控边界评估方法和基于EVs分类方法的功率响应模型;进一步,设计了自适应转动惯量、阻尼系数以及基于CS调频功率边界的频率-调频功率控制器;最后,在MATLAB/Simulink上搭建的CS VSG模型上进行仿真,验证了所提出的控制策略能减小频率的偏移量,提高系统的频率稳定性和动态调节能力,并基于CS调频能力和频率偏移量决定响应调频功率,实现其在CS内EVs间的合理分配。

关键词：充电站电动汽车虚拟同步发电机调频能力调频参与度因子功率响应

维普期刊数据库博看期刊

同方期刊数据库

耦合多期扩展规律和空间异质性的城市扩展元胞自动机模拟

在线全文

学校读者我要写书评

暂无评论

地理与地理信息科学 2024年第1期40卷 26-36页

作者：李启源王海军曾浩然彭小桃孙端陈睿武汉大学资源与环境科学学院湖北武汉430079 自然资源部国土空间规划与开发保护重点实验室北京100871 中规院(北京)规划设计有限公司北京100044 自然资源部华南热带亚热带自然资源监测重点实验室广东广州510631 广东省国土资源测绘院广东广州510663

城市扩展模拟对优化城市空间结构和制定合理规划目标具有重要意义,元胞自动机为城市扩展模拟提供了方法支撑,但综合表达城市扩展时空复杂性的耦合模型仍较少。该文提出一种耦合多期扩展规律和空间异质性的元胞自动机模型(Multi-Temporal... 详细信息

城市扩展模拟对优化城市空间结构和制定合理规划目标具有重要意义,元胞自动机为城市扩展模拟提供了方法支撑,但综合表达城市扩展时空复杂性的耦合模型仍较少。该文提出一种耦合多期扩展规律和空间异质性的元胞自动机模型(Multi-Temporal and Spatial Cellular Automata,MTS-CA),首先从多方面刻画城市扩展特征并计算各时期与模拟目标期的特征相似性,由此为不同时期的城市扩展规律分配权重;然后利用自组织映射神经网络对城市空间进行分区,挖掘不同空间特征下的扩展规则,表达空间异质性;最后将各时期的局部空间转换规则加权融合得到耦合模型的转换规则。以上海市为研究区验证模型的有效性,结果发现:①城市扩展过程并不是简单的马尔可夫过程,顾及多期扩展规律的模型能更充分表达城市扩展机制,且扩展特征的相似性可在一定程度上表征扩展规律的一致性;②挖掘城市扩展规律时,使用地理分区策略可顾及空间异质性,使局部区域概率分布的匹配效果更佳,进而提升模拟精度;③MTS-CA可以顾及城市扩展的时空复杂性,实现更准确、合理的城市扩展模拟。

关键词：城市扩展地理相似性元胞自动机地理模拟时空复杂性

Demand-side Management Based on Model Predictive Control in Distribution Network for Smoothing Distributed Photovoltaic Power Fluctuations

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2022年第5期10卷 1326-1336页

作者： Jian Xu Haobo Fu Siyang Liao Boyu Xie Deping Ke Yuanzhang Sun Xiong Li xiaotao peng IEEE School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China Power Dispatching and Control Center of State Grid Jibei Electric Power Company Limited Bejing 100054China

With the rapid increase of distributed photovoltaic(PV) power integrating into the distribution network(DN), the critical issues such as PV power curtailment and low equipment utilization rate have been caused by PV power fluctuations. DN has less controllable equipment to manage the PV power fluctuation. To smooth the power fluctuations and further improve the utilization of PV, the regulation ability from the demandside needs to be excavated. This study presents a continuous control method of the feeder load power in a DN based on the voltage regulation to respond to the rapid fluctuation of the PV power output. PV power fluctuations will be directly reflected in the point of common coupling(PCC), and the power fluctuation rate of PCCs is an important standard of PV ***, a demand-side management strategy based on model predictive control(MPC) to mitigate the PCC power fluctuation is proposed. In pre-scheduling, the intraday optimization model is established to solve the reference power of PCC. In real-time control, the pre-scheduling results and MPC are used for the rolling optimization to control the feeder load demand. Finally,the data from the field measurements in Guangzhou, China are used to verify the effectiveness of the proposed strategy in smoothing fluctuations of the distributed PV power.

关键词： Demand-side management multi-time-scale optimization power fluctuation smoothing load control model predictive control(MPC)

Controllable Exciton Diffusion Length and Ultrafast Charge Generation in Ternary Organic Solar Cells

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2024年第11期42卷 1275-1283页

作者： Sixuan Cheng Jiawei Qiao peng Lu Wei Qin xiaotao Hao School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinanShandong250100 China School of Physics National Demonstration Center for Experimental Physics EducationShandong UniversityJinanShandong250100 China ARC Centre of Excellence in Exciton Science School of ChemistryThe University of MelbourneParkvilleVictoria3010 Australia

Charge generation,a critical process in the operation of organic solar cell(OSC),requires thorough investigation in an ultrafast *** work demonstrates that the utilization of alloy model for the non-fullerene acceptor(NFA)component can regulate the crystallization properties of active layer films,which in turn affects exciton diffusion and hole transfer(HT),ultimately influencing the charge generation *** incorporating BTP-eC7 as a third component,without expanding absorption range or changing molecular energy levels but regulating the ultrafast exciton diffusion and HT processes,the power conversion efficiency(PCE)of the optimized PM6:BTP-eC9:BTP-eC7 based ternary OSC is improved from 17.30%to 17.83%,primarily due to the enhancement of short-circuit current density(JSC).Additionally,the introduction of BTP-eC7 also reduces the trap state density in the photoactive layer which helps to reduce the loss of *** study introduces a novel approach for employing ternary alloy models by incorporating dual acceptors with similar structures,and elucidates the underlying mechanism of charge generation and JSC in ternary OSCs.

关键词： Organic photovoltaics Ternary strategy Exciton diffusion Hole transfer Trap state Kinetics Alloys Photophysics

珠三角城市群建设用地开发强度时空格局演化及影响因素分析

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

时空信息学报 2024年第2期31卷 248-258页

作者：董泽楷王海军彭小桃孙端谭紫玲王权曾丹旦武汉大学资源与环境科学学院武汉430079 自然资源部华南热带亚热带自然资源监测重点实验室广州510663 广东省国土资源测绘院广州510663 贵州财经大学公共管理学院贵阳550025 武汉东湖学院经济学院武汉430212

建设用地开发强度作为区域城市现代化水平的综合反映及衡量指标,进行其时空变化的测度及影响因素的分析对国土空间合理优化管控具有重要作用;虽然相关研究日益丰富完善,但研究尺度多以城市为单位,方法层面多利用地理加权回归模型进行要... 详细信息

建设用地开发强度作为区域城市现代化水平的综合反映及衡量指标,进行其时空变化的测度及影响因素的分析对国土空间合理优化管控具有重要作用;虽然相关研究日益丰富完善,但研究尺度多以城市为单位,方法层面多利用地理加权回归模型进行要素空间异质性的探究。本文以珠三角城市群为研究区域,构建建设用地开发强度模型体系,计算2010~2020年珠三角各县(区)建设用地开发强度指数,通过空间自相关分析、普通最小二乘法与多尺度地理加权回归对开发强度空间特征以及各影响因素的时空格局演化进行探究。结果表明:①2010~2020年珠三角城市群建设用地开发强度总体呈增长态势,空间差异显著;高强度区主要集中于广州市、深圳市等中心地区,低强度区主要集中于肇庆市、江门市等周围地区;②珠三角建设用地开发强度正向空间集聚效益显著,冷热点空间分布格局与对应开发强度数值空间分布格局基本一致;③固定资产投资、地方财政支出及社会消费品零售总额是影响珠三角建设用地开发强度时空异质性的主导因素,三者均为社会经济影响要素,在各县区中影响程度存在差异性与不稳定性。

关键词：建设用地开发强度时空格局影响因素多尺度地理加权回归珠三角城市群

维普期刊数据库博看期刊

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

基于遥感影像数据的土壤制图研究进展

中国农业信息 2024年第1期36卷 31-42页

作者：赵良军杨颢胡月明刘振华彭代亮王璐任必武黄琦丹彭小桃自然资源部华南热带亚热带自然资源监测重点实验室广东广州510663 四川轻化工大学计算机科学与工程学院宜宾644000 海南大学热带农林学院海口570228 华南农业大学资源环境学院广东广州510642 中国科学院空天信息创新研究院北京101408 广州市华南自然资源科学技术研究院广东广州510610 南京大学地理与海洋科学学院江苏南京210023 广东省国土资源测绘院广州510663

【目的】数字土壤制图成本低、精度高,是刻画土壤环境变量的新技术和新工具,遥感技术在数字土壤制图业务化应用中发挥了重要作用,但是还存在诸多问题和不确定性。文章总结相关研究进展,以期为基于遥感影像数据的土壤数字制图提供有益参... 详细信息

【目的】数字土壤制图成本低、精度高,是刻画土壤环境变量的新技术和新工具,遥感技术在数字土壤制图业务化应用中发挥了重要作用,但是还存在诸多问题和不确定性。文章总结相关研究进展,以期为基于遥感影像数据的土壤数字制图提供有益参考。【方法】梳理遥感技术在土壤类型与属性制图研究中的进展情况并进行总结展望,以期更好地发挥高空间、时间、光谱分辨率遥感数据在土壤数字制图方面的作用,为研发新模型、提高土壤制图模型精度提供信息支撑,为第三次全国土壤普查数字土壤制图提供有益参考。【结果】遥感数据的特征与土壤发生学理论契合并推动了土壤制图的发展,但是,基于遥感的土壤制图技术在快速土壤环境变量因子提取、自适应制图指标筛选、满足多层级制图需求的土壤推测制图模型构建等方面还需要进一步深入探讨。【结论】为了实现土壤类型与属性制图的业务化、流程化和自动化,未来的研究应该着眼于从“环境变量分析—评价指标体系筛选—预测模型构建”一体化解决方案入手,探讨如何融合多种遥感载荷、综合运用新型模型,以提高数字土壤制图的精度,为农业生产和土地资源管理提供更为精准的信息支撑。

关键词：遥感土壤环境变量第三次土壤普查不确定性数字土壤制图

维普期刊数据库博看期刊

Load Shedding and Restoration for Intentional Island with Renewable Distributed Generation

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 612-624页

作者： Jian Xu Boyu Xie Siyang Liao Zhiyong Yuan Deping Ke Yuanzhang Sun Xiong Li xiaotao peng the School of Electrical Engineering and Automations Wuhan UniversityWuhan 430072China the China Southern Power Grid Research Institute China Southern Power Grid CompanyGuangzhou 510663China

Due to the high penetration of renewable distributed generation(RDG),many issues have become conspicuous during the intentional island operation such as the power mismatch of load shedding during the transition process and the power imbalance during the restoration *** this paper,a phase measurement unit(PMU)based online load shedding strategy and a conservation voltage reduction(CVR)based multi-period restoration strategy are proposed for the intentional island with *** proposed load shedding strategy,which is driven by the blackout event,consists of the load shedding optimization and correction *** the occurrence of the large-scale blackout,the load shedding optimization is solved periodically to obtain the optimal load shedding plan,which meets the dynamic and steady *** the blackout occurs,the correction table updated in real time based on the PMU data is used to modify the load shedding plan to eliminate the power mismatch caused by the fluctuation of *** the system transits to the intentional island seamlessly,multi-period restoration plans are generated to optimize the restoration performance while maintaining power balance until the main grid is ***,CVR technology is implemented to restore more loads by regulating load *** proposed load shedding optimization and restoration optimization are linearized to mixed-integer quadratic constraint programming(MIQCP)*** effectiveness of the proposed strategies is verified with the modified IEEE 33-node system on the real-time digital simulation(RTDS)platform.

关键词： Intentional island renewable distributed generation(RDG) load shedding restoration phase measurement unit(PMU) conservation voltage reduction(CVR)

Adsorption experiment of water-soluble rare earth elements in atmospheric depositions and implications for source tracing in South China

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2021年第2期40卷 225-233页

作者： Xiaojian Mi Yuan Li Yuefeng Liu Yu Xie Hanjie Li xiaotao peng Houyun Zhou School of Geography South China Normal UniversityGuangzhou 510631China Department of Geography Lingnan Normal UniversityZhanjiang 524048China

The distribution patterns of rare earth elements(REEs)in fine-grained materials in various depositions were often found to be similar to those of the aeolian sediments deposited in the Loess Plateau in North China and the fine-grained materials were suggested to be derived from wind-blown ***,increasing evidence indicated that the REEs in the water-soluble portion of atmospheric depositions also displayed similar patterns to those of aeolian *** this study,water-soluble REEs in three atmospheric depositions collected from different climatic zones in China were adsorbed with two adsorbents with distinct adsorption capacity,glass powder,and co-precipitated iron *** results showed that the REEs adsorbed by the two adsorbents displayed patterns similar to those of the original atmospheric *** typical characteristics of the REE patterns of atmospheric deposition can be well reproduced in the adsorbed *** higher the REE concentrations in the atmospheric depositions,or the higher adsorption efficiency of the adsorbents,the better reproducibility of the REEs *** results suggest that the REEs of the fine-grained materials in various sediments,which have a high adsorption capacity,especially those deposited in South China,may come from the water-soluble REEs in atmospheric deposition,and may not be appropriate tracers of wind-blown dust from North China.

关键词： Atmospheric deposition Rare earth element Adsorption experiment Source tracing Fine-grained material

An on-line power/voltage stability index for multi-infeed HVDC systems

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2019年第5期7卷 1094-1104页

作者： Jian XU Tiankai LAN Siyang LIAO Yuanzhang SUN Deping KE Xiong LI Jun YANG xiaotao peng School of Electrical Engineering and Automation Wuhan UniversityWuhanChina

High-voltage direct current(HVDC)transmission is playing an increasingly important role in modern power systems,and the resulted power/voltage stability issue has raised widespread *** paper presents an on-line power/voltage stability index(PVSI)for multi-infeed HVDC(MIDC)*** from the existing indices which are developed mainly for off-line and static analysis,the proposed PVSI can be applied in real *** of system changes on stability assessment such as change of system states and control strategies are ***,helpful guidance can be provided for on-line HVDC stability and *** PVSI is originally deduced for single-infeed HVDC systems in an‘‘AC way’’by analyzing the power and voltage stability of both pure AC systems and HVDC ***,its on-line application in practical MIDC systems is realized by building an equivalent single-infeed model,and utilizing nowadays measurement and communication infrastructures such as wide-area measurement system(WAMS).The effectiveness of the PVSI is verified through simulations in real-time digital simulator(RTDS).

关键词： Multi-infeed high-voltage direct current(HVDC)system Power stability Voltage stability Stability index Practical on-line application