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Optimal Initialization and Starting Approach of Synchronous Condenser Integrated Power Grid

CSEE Journal of Power and Energy Systems 2024年第1期10卷 248-260页

作者： puyu wang Xing Liu Qingwen Mou Tao Yuan Tianming Gu Hemin Yang Xiao-Ping Zhang Zhengrong Xiang Chunyi Guo School of Automation Nanjing University of Science and TechnologyNanjing 210094China NARI Group Corporation/State Grid EPRI and also with NARI Technology Co.Ltd. Nanjing 211106China School of Engineering University of BirminghamBirminghamB152TTUnited Kingdom State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China

Synchronous condensers(SCs)are generally used at the receiving-end stations of ultra-high-voltage direct current(UHVDC)transmission systems due to their strong reactive power support and flexible regulation of reactive power according to the interconnected grids operating *** this paper,different starting control schemes of a SC integrated power grid are investigated providing four main contributions:1)The principle of reactive power support of the SC on the interconnected power grid is analytically studied,providing the establishment of mathematical models.2)Four different starting control schemes are developed for the initialization and SC integration,*** Scheme 1,a preset initial falling speed is directly utilized without initialization;in Scheme 2,a black start sequential control approach with a static frequency converter(SFC)is proposed;in Scheme 3,PI/PD/PID controllers are respectively applied for the excitation device at the speed-falling stage;in Scheme 4,a pre-insertion approach of an energy absorption component with R/L/RL is utilized to suppress the surges at the SC integration instant.3)The dynamic behaviors of four different starting schemes at specific operating stages are evaluated.4)The success rate of SC integration is analyzed to evaluate starting control *** of the SC interconnected system with four different starting control schemes is evaluated in the timedomain simulation environment PSCAD/EMTDC^(TM).The results prove the superiority of the proposed starting control approach in Scheme 4.

关键词： Black start dynamic behaviors excitation system pre-insertion of energy absorption components starting control schemes static frequency converter(SFC) success rate of integration synchronous condenser(SC)

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全生命周期视域下口述历史档案元数据建设研究——基于OHA《口述历史元数据与描述》的解析

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档案学研究 2024年第4期 77-86页

作者：程结晶王璞钰扬州大学社会发展学院扬州225009

元数据管理和应用可促进口述历史档案的组织、创新和管理工作,对OHA《口述历史元数据与描述》展开解读,能够为我国口述历史档案的元数据工作提供参考借鉴。论文首先提炼《口述历史元数据与描述》中的核心内容,其次基于生命周期理论深入... 详细信息

元数据管理和应用可促进口述历史档案的组织、创新和管理工作,对OHA《口述历史元数据与描述》展开解读,能够为我国口述历史档案的元数据工作提供参考借鉴。论文首先提炼《口述历史元数据与描述》中的核心内容,其次基于生命周期理论深入分析口述历史档案元数据的整个生命周期阶段及管理模型中的关键要素,最后总结相关经验。研究发现,该模型对口述历史档案的元数据建设具有一定的理论与实践价值,其包括明确口述历史档案元数据建设原则、提升元数据生命力及确立元数据最佳建设模式。

关键词：口述历史档案元数据《口述历史元数据与描述》生命周期

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基于在线特征库的非侵入式负荷特征提取方法

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中国电机工程学报 2024年第9期44卷 3489-3499,I0012页

作者：王谱宇耿路路刘兴江程含渺方凯杰张小平南京理工大学自动化学院江苏省南京市210094 中国电子科技集团公司第18研究所天津市西青区300384 江苏省电力有限公司营销服务中心江苏省南京市210019 英国伯明翰大学工程学院英国伯明翰B152TT

负荷特征是指负荷设备运行过程中具备某种统计规律的特殊标识,而包含负荷特征的数据库则是实现非侵入式负荷监测与分解的基本依据。对于纯阻性负荷设备,研究人员利用其运行状态切换过程中功率产生跃变的特点,可以准确提取相应状态下的... 详细信息

负荷特征是指负荷设备运行过程中具备某种统计规律的特殊标识,而包含负荷特征的数据库则是实现非侵入式负荷监测与分解的基本依据。对于纯阻性负荷设备,研究人员利用其运行状态切换过程中功率产生跃变的特点,可以准确提取相应状态下的负荷特征。然而,对非纯阻性设备,其负荷特征提取存在以下2个问题。问题1)运行状态切换过程中功率变化不显著,无法精准定位状态投切时刻点;问题2)负荷设备存在功率缓变化的运行状态,导致对应状态下的负荷特征不唯一,无法手动提取。为了解决非纯阻性设备负荷特征提取中存在的上述问题,提出一种基于在线特征库的非侵入式负荷特征提取方法,该方法分为2个阶段。第一阶段:基于负荷设备运行过程中的稳态周期电流数组建立在线特征库,通过改进Pearson相似系数构建滑窗函数,得到负荷设备运行时的周期电流数组与在线特征库的相似性,并同步判断在线特征库冗余性,实现负荷设备状态数据分割;第二阶段:计算在线特征库的特征矩阵,对特征矩阵进行K-means聚类分析,融合相似在线特征库,形成负荷设备的状态特征库,从而实现负荷设备特征电流数组的提取。在私人数据集和PLAID数据集上的测试结果证明,所提负荷特征提取方法在不同的用电场景下均有较好的鲁棒性。所提方法可大幅减少负荷特征提取阶段的人工参与,有利于缓解因负荷设备种类过多导致的负荷特征提取烦琐的问题,为后续建立负荷特征数据库提供了便利。

关键词：状态检测负荷特征周期电流数组在线特征库 K-means算法

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Assessing quinoline removal performances of an aerobic continuous moving bed biofilm reactor(MBBR) bioaugmented with Pseudomonas citronellolis LV1

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Chinese Journal of Chemical Engineering 2023年第5期57卷 132-140页

作者： Hu Chen Ying wang puyu wang Yongkang Lv Innovation Institute of Environmental Industry College of Environmental Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China The State Key Laboratory of Clean and Efficient Utilization of Coal-Based Energy Taiyuan University of TechnologyTaiyuan 030024China China Institute for Radiation Protection Taiyuan 030006China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030024China

This study evaluated the bioaugmentation potential of a quinoline-degrading strain Pseudomonas citronellolis LV1 inoculation into activated sludge for treating quinoline wastewater, and results indicated the inoculation of LV1 in aerobic continuous MBBR could substantially improve the quinoline removal performance with an improved removal efficiency of 34% averagely when quinoline was used as the sole carbon and nitrogen source. Additionally, efficient removal of quinoline in enhanced MBBR occurred at the influent p H of 7.0–8.0, hydraulic retention time(HRT) of 24–28 h and influent quinoline concentration of 100–700 mg·L^(-1). High-throughput sequencing analysis indicated that bioaugmentation could increase microbial diversity and shape the microbial community structure. Although the inoculant LV1 did not remain its dominance in stage Ⅲ, bioaugmentation indeed induced the formation of effective microbial community, and the indigenous microbes including Flavobacterium, Pseudoxanthomonas,Pseudomonas, Vermamoeba, Dyadobacter and Sphingomonas might play the key role in quinoline *** to the PICRUSt, the enhanced genes encoding aromatic ring-cleavage enzyme, especially for Nheterocyclic ring-cleavage enzymes, could lead to the improved removal performance of quinoline in bioaugmentation stage. Moreover, the enhanced MBBR treated well actual coking wastewater, as indicated by high removal performance of quinoline, phenol and COD.

关键词： Aerobic quinoline degradation Pseudomonas citronellolis LV1 Bioaugmentation Microbial community Coking wastewater

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基于自抗扰控制的双馈风电场分层无功功率支撑策略

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智慧电力 2024年第6期52卷 77-83页

作者：顾邵华杨德健王普宇桑顺现代电力系统仿真控制与绿色电能新技术教育部重点实验室吉林吉林132012 南京理工大学自动化学院江苏南京210094 南通大学电气工程学院江苏南通226019

随着风力发电的规模化联网,电力系统电压问题愈发突出。为提高双馈风电场在电网故障下的暂态响应特性,提出1种基于自抗扰控制(ADRC)的双馈风电场分层无功功率支撑策略。首先,描述了双馈异步风力发电机(DFIG)的无功功率边界;其次,设计双... 详细信息

随着风力发电的规模化联网,电力系统电压问题愈发突出。为提高双馈风电场在电网故障下的暂态响应特性,提出1种基于自抗扰控制(ADRC)的双馈风电场分层无功功率支撑策略。首先,描述了双馈异步风力发电机(DFIG)的无功功率边界;其次,设计双馈风电场的分层无功功率支撑策略,在场站控制器中利用自抗扰控制器产生电压控制信号,在机组控制器中采用变增益系数辅助调整电压;最后,使用Washout滤波器抑制暂态过电压,搭建基于EMTP-RV的双馈风电场仿真模型。仿真分析表明,所提控制策略在电网电压跌落时具有良好的支撑效果。

关键词：双馈风电场电压控制自抗扰控制无功功率支撑过电压抑制

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Region-wide glacier area and mass budgets for the Shaksgam River Basin,Karakoram Mountains,during 2000–2016

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Journal of Arid Land 2021年第2期13卷 175-188页

作者： wang Panpan LI Zhongqin XU Chunhai wang puyu College of Geography and Environmental Science Northwest Normal UniversityLanzhou 730070China State Key Laboratory of Cryospheric Sciences/Tianshan Glaciological Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

The Karakoram Mountains are well known for their widespread surge-type glaciers and slight glacier mass *** the one hand,glaciers are one of the sensitive indicators of climate change,their area and thickness will adjust with climate *** the other hand,glaciers provide freshwater resources for agricultural irrigation and hydroelectric generation in the downstream areas of the Shaksgam River Basin(SRB)in western *** shrinkage of glaciers caused by climate change can significantly affect the security and sustainable development of regional water *** this study,we analyzed the changes in glacier area from 2000 to 2016 in the SRB using Landsat TM(Thematic Mapper)/ETM+(Enhanced Mapper Plus)/OLI(Operational Land Imager)*** is shown that the SRB contained 472 glaciers,with an area of 1840.3 km2,in *** glacier area decreased by 0.14%/a since 2000,and the shrinkage of glacier in the southeast,east and south directions were the most,while the northeast,north directions were the ***-covered area accounted for 8.0%of the total glacier *** estimated elevation and mass changes using the 1 arc-second SRTM(Shuttle Radar Topography Mission)DEM(Digital Elevation Model)(2000)and the resolution of 8 m HMA(High Mountain Asia)DEM(2016).An average thickness of 0.08(±0.03)m/a,or a slight mass increase of 0.06(±0.02)m w.e./a has been obtained since *** found thinning was significantly lesser on the clean ice than the debris-covered *** addition,the elevation of glacier surface is spatially heterogeneous,showing that the accumulation of mass is dominant in high altitude regions,and the main mass loss is in low altitude regions,excluding the surge-type *** surge-type glaciers,the mass may transfer from the reservoir to the receiving area rapidly when surges,then resulting in an advance of glacier *** main surge mechanism is still unclear,it is worth noting that the surge did not increase the glacier mass in this study.

关键词： glacier mass balance SRTM DEM HMA DEM Karakoram Mountains

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Glacier Volume Calculation from Ice-Thickness Data for Mountain Glaciers—A Case Study of Glacier No. 4 of Sigong River over Mt. Bogda, Eastern Tianshan, Central Asia

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Journal of Earth Science 2014年第2期25卷 371-378页

作者： puyu wang Zhongqin Li Wenbin wang Huilin Li Feiteng wang State Key Laboratory of Cryospheric Sciences Tianshan Glaciological Station Cold and Arid Region Environment and Engineering Research Institute Chinese Academy of Sciences College of Geography and Environment Science Northwest Normal University

The determination of total glacial volume is important for the observation of climatic change and its consequences such as global sea-level rise. The tongue area of Glacier No. 4 of Sigong River over Mt. Bogda, eastern Tianshan was surveyed by ground-penetrating radar （GPR） and real time kinematic （RTK）-global positioning system （GPS） during the summer campaign 2009. In order to calculate the glacier volume, both co-kriging algorithm and estimation based on the theory of perfectly plastic material were employed. Results indicated that the ice-thickness distribution of the investigated glacier ranges from 0 to 105.0 m, with the mean thickness of 27.6 m in 2009. The corresponding ice volume was -0.076 km3 （-0.068 km3 water equivalent）. The bedrock topography shows more undulating than the glacier surface. The difference of the calculated ice volume in this study and the estimated value from the empirical formula is large. Therefore, it is urgent to validate the applicability of the ex- isting empirical formula.

关键词： ice volume ice-thickness GPR Glacier No. 4 of Sigong River Tianshan.

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Nyquist Stability Analysis and Capacitance Selection for DC Current Flow Controllers in Meshed Multi-terminal HVDC Grids

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CSEE Journal of Power and Energy Systems 2021年第1期7卷 114-127页

作者： puyu wang Shihua Feng Pengcheng Liu Ningqiang Jiang Xiao-Ping Zhang School of Automation Nanjing University of Science&Technology(NUST)Nanjing 210094China School of Engineering University of BirminghamEdgbastonBirmingham B152TTUnited Kingdom

Controllability of DC current/power flow is essentialin multi-terminal HVDC (MTDC) grids, particularly for theMTDC grids in a meshed topology. In this paper, consideringmeshed MTDC (M2TDC) grids with the installation of twoline/multi-lineDC current flow controllers (CFCs), a small-signalmodel of the DC CFCs integrated M2TDC grids is derived,studying the impact of the power losses of the DC CFC andtheir influence on the analysis of energy exchanges. The systemstability analysis is analysed using the Nyquist diagram, which ismore suitable for analyzing complex nonlinear systems with morecompact and reliable indicators of stability in comparison withgain/phase margins shown in the Bode diagram. In addition, aselection method of the interconnected capacitor of the DC CFCis proposed under different operating conditions. The impact ofthe switching frequencies of the DC CFC on the control ranges ofthe DC current flows is analyzed. The effectiveness of the Nyquistanalysis and the capacitance selection method is verified bysimulation studies using PSCAD/EMTDC. The obtained control ranges of the DC CFC with different switching frequenciesand capacitances would be useful for practical engineeringapplications.

关键词： Capacitance selection method control ranges DC current flow controller(CFC) meshed multi-terminal HVDC(M2TDC)grid Nyquist stability analysis small-signal modelling switching frequencies

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萨吾尔山冰川现状及演化过程

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干旱区地理 2024年第8期47卷 1277-1291页

作者：牟建新李忠勤王璞玉梁鹏斌王炎强白昌彬王芳龙中国科学院西北生态环境资源研究院冰冻圈科学与冻土工程重点实验室/阿尔泰山冰冻圈科学与可持续发展综合观测研究站甘肃兰州730000 青海理工学院生态与环境科学学院青海西宁810000 青海省高原气候变化及其生态环境效应重点实验室青海西宁810000 山西农业大学资源环境学院山西太谷030801 南宁师范大学广西南宁530001

萨吾尔山是中国西部14座冰川分布的山系之一,横跨中国和哈萨克斯坦两国,尽管冰川规模不大,但因二元政治主体割裂了科学研究的完整性,同时萨吾尔山冰川水资源对于新疆阿勒泰地区吉木乃县可持续发展具有重要意义,为此结合航摄地形图、Land... 详细信息

萨吾尔山是中国西部14座冰川分布的山系之一,横跨中国和哈萨克斯坦两国,尽管冰川规模不大,但因二元政治主体割裂了科学研究的完整性,同时萨吾尔山冰川水资源对于新疆阿勒泰地区吉木乃县可持续发展具有重要意义,为此结合航摄地形图、Landsat及Sentinel卫星遥感影像,并参考已有冰川编目和Google Earth高分辨率历史图像等数据资料,在野外台站现场观测验证基础上对萨吾尔山冰川当前现状和过去30多年间的变化进行了详细研究。结果表明:(1)截止2022年,萨吾尔山共分布冰川31条,总面积11.47 km^(2),新疆吉木乃县境内的木斯岛冰川为最大规模冰川,面积2.95 km^(2),其余90%的冰川其面积不足1 km^(2)。(2)过去30多年来,萨吾尔山冰川变化的总体趋势是冰川分裂、面积减小和末端后退持续增加。冰川数量从12条分裂成31条,1989-2022年冰川面积减少8.11 km^(2),退缩率达41.42%,冰川末端退缩11.30 m。气温升高、冰川反照率降低和冰川破碎程度加大是引起萨吾尔山冰川退缩的主要原因。(3)相较于我国其他13座高大山系,萨吾尔山在过去半个多世纪中冰川面积相对退缩幅度最大。未来在全球气候变暖背景下萨吾尔山冰川极大可能会基本消融殆尽,这对本就干旱贫水的吉木乃县可持续发展将产生重要影响,需提早统筹谋划以应对未来的水资源危机。

关键词：冰川现状演化过程冰川变化萨吾尔山

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Spatial variability of glacial changes and their effects on water resources in the Chinese Tianshan Mountains during the last five decades

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Journal of Arid Land 2015年第6期7卷 717-727页

作者： wang puyu LI Zhongqin HUAI Baojuan wang Wenbin LI Huilin wang Lin State Key Laboratory of Cryospheric Sciences/Tianshan Glaciological Station Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences College of Geography and Environmental Science Northwest Normal University

Changes in glaciers in the Chinese Tianshan Mountains have been analyzed previously. However, most previous studies focused on individual glaciers and/or decentralized glacial basins. Moreover, a majority of these studies were published only in Chinese, which limited their usefulness at the international level. With this in mind, the authors reviewed the previous studies to create an overview of glacial changes in the Chinese Tianshan Mountains over the last five decades and discussed the effects of glacial changes on water resources. In response to climate change, glaciers in the Tianshan Mountains are shrinking rapidly and are ca. 20% smaller on average in the past five decades. Overall, the area reduction of glacial basins in the central part of the Chinese Tianshan Mountains is larger than that in the eastern and western parts. The spatial differentiation in glacial changes are caused by both differences in regional climate and in glacial factors. The effects of glacial changes on water resources vary in different river basins due to the differences in glacier distribution, characteristics of glacial change and proportion of the glacier meltwater in river runoff.

关键词： Chinese Tianshan Mountains climate change glacial change regional differences water resources

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