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KPI-based Real-time Situational Awareness for Power Systems with a High Proportion of Renewable Energy Sources

CSEE Journal of Power and Energy Systems 2022年第4期8卷 1060-1073页

作者： Tianhan Zhang Shengyuan Liu Weiqiang Qiu Zhenzhi Lin lingzhi zhu Zhao Dawei Minhui Qian LI Yang College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Renewable Energy Research Center China Electric Power Research Institute(State Key Laboratory of Operation and Control of Renewable Energy&Storage SystemsJiangsu Engineering Technology Research Center for Energy Storage Conversion and Application)Nanjing 210003China

With the increasing complexity of power systems and the widespread penetration of renewable energy sources(RES),real-time situational awareness for power systems is of great significance for operational scheduling.Considering the impact of RES on power system operations,a situational awareness key performance index(KPI)system for power systems with a high proportion of RES is proposed in this paper,which consists of reserve capacity abundance,ramp resource abundance,center of inertia(COI)frequency deviation,interface power flow margin,synthesized voltage stability,and angle stability margin.Then,the KPIs are synthesized and visualized by the decision tree method and radar chart method,respectively,for monitoring the operation states(i.e,normal,alert,and emergency states)of power systems with a high proportion of RES.Numerical simulations are conducted in a revised New England 16-machine 68-bus power system and an actual CEPRI-RE power system in the northwest region of China with a high proportion of RES.The results show that the proposed KPI-based situational awareness method is able to accurately monitor the real-time state of power systems with a high proportion of RES,and can assist power dispatchers to make effective decisions.

关键词： High proportion of renewable energy sources(RES) key performance index(KPI) situational awareness state visualization

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HPDS133-bus:A Benchmark Test System for Distribution Systems with High Penetration of Distributed Generation

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CSEE Journal of Power and Energy Systems 2023年第3期9卷 963-977页

作者： Fengzhang Luo Chongbo Sun Xin Yang Tianyu Zhang Chengshan Wang Jun Xiao Liangzhong Yao lingzhi zhu Minhui Qian Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China State Grid Economic and Technology Research Institute Co. Ltd.Changping DistrictBeijing 102209China Ultra High Voltage Company State Grid Henan Electric Power CompanyZhengzhou 450007China Economic and Technology Research Institute State Grid Tianjin Electric Power CompanyTianjin 300171China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China China Electric Power Research Institute Xiaoying RoadBeijing 100192China

The benchmark test system for distribution systems is necessary and important for system analysis and result data checking.In order to meet the development demand of the distribution systems which integrate with a high penetration of distributed generation(DG),a benchmark test system for the distribution systems which adapts to current and future development trends is proposed.Based on the concentric zone theory and the typical regional settlement model in China,three typical distribution system scenarios corresponding to different system circle structures and regional development characteristics are designed in this paper.In order to adapt to the trend that the distribution systems will present the mixed state of AC and DC,a typical improvement scheme of distribution systems in urban scenario is presented.The benchmark test system of low-voltage distribution systems in a rural scenario is also designed because of the high penetration of DG.Moreover,the system structure,load parameters,integrated capacity and output characteristics of varies types of DG in different scenarios are described in detail.Finally,the simulation results,such as the time series power flow,reliability evaluation and hosting capacity of DGs are given.The benchmark test system proposed in this paper will lay a foundation for future research on distribution systems with a high proportion of DG and effectively support the distribution systems planning,design,operations and dispatches.

关键词： Benchmark test system distribution systems DG PV typical scenario

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Structural and chemical engineering of metal-organic framework-derived nickel disulfide nanosheets as the compacted cathode matrix for lithium-sulfur batteries

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Chinese Journal of Structural Chemistry 2023年第9期42卷 34-40页

作者： Qi Zhang Wenxiang Shen Pengyue Li Jinshang Song lingzhi zhu Enshan Han Ruihu Wang Xiaoju Li Hebei Key Laboratory of Functional Polymer School of Chemical Engineering and TechnologyHebei University of TechnologyTianjin300130China Fujian Provincial Key Laboratory of Polymer Materials College of Chemistry and Materials ScienceFujian Normal UniversityFuzhou350007China

Lithium-sulfur(Li–S)batteries are recognized as promising high-energy-density storage systems.It is crucial to develop the compacted sulfur cathodes with high sulfur content and high sulfur loading for practical applications.The metal-containing nanosheets are promising cathode matrix to mediate the accompanying problems,such as low sulfur utilization,unavoidable polysulfides shuttling and poor rate performance.Herein,we develop Ni-MOF-based strategy to fabricate nickel disulfide nanosheets on the reduced graphene oxide surface(NSG).Benefiting from nanosheets structure,strong polysulfides affinity,high electronic conductivity and superior electrocatalytic effect of NSG heterostructure,the resultant electrode exhibits high electrochemical performance with 0.021%capacity decay per cycle in 1000 cycles.Remarkably,the electrode with 88 wt%sulfur content and 5.9 mg cm^(−2) sulfur loading delivers reversible capacity of 945 mA h g^(−1),areal capacity of 6.1 mA h cm^(−2) and volumetric capacity of 997 mA h cm^(−3) at 0.5 C,which is comparable with the state-of-the-art those in the reported energy storage systems.This work provides methodology guidance for the development of cathode matrix to achieve high-energy-density and long-life Li–S batteries.

关键词： Lithium-sulfur batteries Metal-organic frameworks Nanosheets Nickel disulfide Shuttling effect

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A third dose of inactivated SARS-CoV-2 vaccine induces robust antibody responses in people with inadequate response to two-dose vaccination

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National Science Review 2022年第7期9卷 14-16页

作者： Taicheng Zhou Tianpei Shi Ao Li lingzhi zhu Xinshuai Zhao Naiyin Mao Wanting Qin Hanfang Bi Mei Yang Muxian Dai Fengwei Liu Rong Wang Wei Su Liang Zhang Wenbo Xu Jia Wei Zijie Zhang Central Laboratory and Liver Disease Research Center The Affiliated Hospital of Yunnan UniversityYunnan University State Key Laboratory for Conservation and Utilization of Bio-resource and School of Life Sciences Yunnan University State Key Laboratory of Genetic Resources and Evolution and Yunnan Laboratory of Molecular Biology of Domestic Animals Kunming Institute of Zoology Chinese Academy of Sciences College of Life Science University of Chinese Academy of Sciences NHC Key Laboratory of Medical Virology and Viral Diseases National Institute for Viral Disease Control and Prevention Chinese Center for Disease Control and Prevention

Mass application of SARS-CoV-2 vaccines is a major approach to reduce SARS-CoV-2 transmission and COVID-19 symptoms worldwide.The inactivated SARS-CoV-2 vaccine is one of the most widely administered vaccine types in many countries,with over 2 billion doses administered as of 31 August 2021.However, clinical trials estimate 65%-85%protection from detectable symptoms for inactivated SARS-C oV-2 vaccines [1-4],

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Analysis on Application of a Current-source Based DFIG Wind Generator Model

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CSEE Journal of Power and Energy Systems 2018年第3期4卷 352-361页

作者： Jin Ma Dawei Zhao Liangzhong Yao Minhui Qian Koji Yamashita lingzhi zhu School of Electrical&Electronic Engineering North China Electric Power University(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources)Beijing 102206China Renewable Energy Research Center China Electric Power Research Institute(State Key Laboratory of Operation and Control of Renewable Energy&Storage SystemsJiangsu Engineering Technology Research Center for Energy Storage Conversion and Application)Nanjing 210003China Power System Sector Central Research Institute of Electric Power IndustryTokyo 201-8511Japan

Models for simulation are vital for the authenticity of the simulation.Modeling doubly fed induction generation(DFIG)for power system stability analysis has attracted a great deal of research interests in the past few years due to the wide applications of DFIG in wind power generation.The models developed by the wind generator manufacturers are not only complicated,but also proprietary and very specific to their own products.Many simplified generic models have been proposed.Among them,the current-source based model is most widely used for power system stability analysis.The validation work on this model so far has been based on the selected simulation scenarios or limited real measurements.However,there has been no systematic and theoretic analysis on the validity of the current-source based model,which may cause inappropriate applications of this type of model in real engineering practices.This paper presents the conditions for using the current-source based model for power system stability analysis;then examines the model’s validity under symmetrical and asymmetrical fault conditions.Our practices for modeling and validating a real wind farm in North China confirm the validity analysis of this work on the current-source based DFIG model.

关键词： Applicationanalysis current-source doublyfed induction generation(DFIG) modelvalidation

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Wind power forecasting error-based dispatch method for wind farm cluster

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Journal of Modern Power Systems and Clean Energy 2013年第1期1卷 65-72页

作者： Ning CHEN Qi WANG Liangzhong YAO lingzhi zhu Yi TANG Fubao WU Mei CHEN Ningbo WANG China Electric Power Research Institute Nanjing 210003China Southeast University Nanjing 210096China China Electric Power Research Institute Beijing 100192China Gansu Electric Power Company Lanzhou 730050China

With the technical development of wind power forecasting,making wind power generation schedule in power systems become an inevitable tendency.This paper proposes a new dispatch method for wind farm(WF)cluster by considering wind power forecasting errors.A probability distribution model of wind power forecasting errors and a mathematic expectation of the power shortage caused by forecasting errors are established.Then,the total mathematic expectation of power shortage from all WFs is minimized.Case study with respect to power dispatch in a WF cluster is conducted using forecasting and actual wind power data within 30 days from sites located at Gansu Province.Compared with the variable proportion method,the power shortage of the WF cluster caused by wind power forecasting errors is reduced.Along with the increment of wind power integrated into power systems,the method positively influences future wind power operation.

关键词： Wind power Dispatch Forecasting error Probabilistic distribution

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Economic analysis of solar energy development in North Africa

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Global Energy Interconnection 2018年第1期1卷 53-62页

作者： Liang Zhao Wei Wang lingzhi zhu Yang Liu Andreas Dubios China Electrical Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Global Energy Interconnection of Development and Cooperation Organization Intec-GOPA International Energy Consultants GmbH

The economic analysis of solar energy development is the basis of promoting the solar energy planning in north Africa and realizing the clean energy power transmission among continents. In this paper, the cost development trend of photovoltaic(PV) power and concentrating solar power(CSP) generation is analyzed, and the levelized cost of energy(LCOE) of solar power generation is forecasted. Then, taking the development of Tunisian solar energy as an example in the context of transcontinental transmission, PV power with energy storage and PV-CSP power generation are given as two kinds of development plan respectively. The installed capacity configurations of the two schemes are given with production simulation method, and comprehensive LCOE are calculated. The studies show that based on the LCOE forecast value, the LCOE of PV-CSP combined power generation will decrease when the annual utilization hours of transmission channel is increased. It can be chosen as one of important mode of the North Africa solar energy development.

关键词： North Africa Photovoltaic power generation Concentrating solar power Energy storage Technical and economic

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新能源场站快速有功控制及频率支撑技术综述

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中国电机工程学报 2024年第11期44卷 4335-4352,I0013页

作者：高丙团胡正阳王伟胜朱凌志王满亮全相军李少林东南大学江苏省南京市210096 中国电力科学研究院有限公司北京市海淀区100192

以光伏/风电为代表的新能源高比例并网降低了电力系统的惯量水平和频率支撑能力,频率稳定问题成为当前电网安全稳定和新能源高效消纳的核心问题之一。发展新能源发电并网机组单元和场站的快速有功频率响应和主动支撑能力是当前的研究热... 详细信息

以光伏/风电为代表的新能源高比例并网降低了电力系统的惯量水平和频率支撑能力,频率稳定问题成为当前电网安全稳定和新能源高效消纳的核心问题之一。发展新能源发电并网机组单元和场站的快速有功频率响应和主动支撑能力是当前的研究热点。该文以“单机快速有功控制-场站快速有功控制-场站快速频率支撑”为主线,梳理光伏/风电的快速有功控制及频率支撑发展现状,分析频率检测、通信延时和控制响应模式等因素对光伏/风电场站频率响应快速性的影响,指出风电机组的机械载荷约束、风电场百毫秒级有功控制、场站的调频响应模式选择和优化、暂态有功无功协同控制是提升新能源发电单元和场站的快速有功频率响应能力的4个关键问题,最后对未来的重点研究方向进行展望和讨论。

关键词：新能源场站风电场光伏电站有功控制频率响应频率检测

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以降温急救护理为基础的综合护理在上呼吸道感染致高热惊厥患儿中的应用

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中西医结合护理（中英文） 2024年第2期10卷 103-105页

作者：刘如韩玲芝朱杉华中科技大学同济医学院附属同济医院湖北武汉435500

目的分析以降温急救护理为基础的综合护理对上呼吸道感染致高热惊厥患儿临床症状消退时间的影响。方法 2021年8月至2022年8月,以在华中科技大学同济医学院附属同济医院接受治疗的95例上呼吸道感染致高热惊厥患儿为研究对象,按随机数字... 详细信息

目的分析以降温急救护理为基础的综合护理对上呼吸道感染致高热惊厥患儿临床症状消退时间的影响。方法 2021年8月至2022年8月,以在华中科技大学同济医学院附属同济医院接受治疗的95例上呼吸道感染致高热惊厥患儿为研究对象,按随机数字表法进行分组。常规组(48例)采用常规护理,研究组(47例)采用以降温急救护理为基础的综合护理,对比2组患儿的炎症因子水平等情况。结果研究组患儿的退热时间、惊厥消失时间、咳嗽改善时间和气喘消失时间均早于常规组,住院时间短于常规组,高热惊厥发作次数少于常规组(P均<0.05)。入院第3天及出院当天,研究组患儿的炎症指标(超敏C反应蛋白、白介素-6、白细胞)水平均低于同期常规组(P均<0.05)。出院当天,研究组的肺功能指标(呼气流量峰值、第1秒用力呼气容积和用力肺活量)水平均优于常规组(P均<0.05)。结论以降温急救护理为基础的综合护理可促进上呼吸道感染致高热惊厥患儿的临床症状消退,改善其炎症因子水平和肺功能。

关键词：上呼吸道感染儿童以降温急救护理为基础的综合护理高热惊厥退热

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共同内群体认同的心理效应及其影响因素

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心理科学 2024年第2期47卷 440-449页

作者：祝婷李凌智温芳芳佐斌鞠一琰龙佳慧华中师范大学心理学院暨社会心理研究中心武汉430079 青少年网络心理与行为教育部重点实验室武汉430079 中山大学心理学系广州510006

共同内群体认同是不同子群体成员进行再分类后,对共同的上位群体产生的积极认同的情感。共同内群体认同能够产生促进心理融合、降低群际偏见和增加亲社会行为等积极效应;但在某些情况下,共同内群体认同也会产生降低信任与内疚感、增加... 详细信息

共同内群体认同是不同子群体成员进行再分类后,对共同的上位群体产生的积极认同的情感。共同内群体认同能够产生促进心理融合、降低群际偏见和增加亲社会行为等积极效应;但在某些情况下,共同内群体认同也会产生降低信任与内疚感、增加群际敌意与偏见和减少亲社会行为等消极效应。对不同群体的感知相似性和形成共同内群体的动机等个体心理属性、群体规模和群体地位等群体属性、不同情境类型以及再分类方式会对共同内群体认同效应产生影响。检验共同内群体认同效应出现矛盾的原因、探索不同因素的共同作用,并结合现实背景考虑群体身份变换性在再分类中的应用,将是未来研究的重要方向。

关键词：共同内群体认同再分类群际关系积极效应消极效应

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