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Control Theory and Technology 2024年第3期22卷 343-344页

作者： yiguang hong shengwei mei Ping Yang Department of Control Science and Engineering Tongji UniversityShanghai200092China Shanghai Research Institute for Intelligent Autonomous Systems Tongji UniversityShanghai200092China Department of Electrical Engineering and Applied Electronics Technology Tsinghua UniversityBeijing100084China School of Electric Power South China University of TechnologyGuangzhou510640GuangdongChina

It is our great pleasure to organize this special issue in Control Theory and Technology in honor of the 90th birthday of Professor Huashu *** is one of the pioneers in control theory and applications in China,and has made many truly outstanding contributions to the field including nonlinear dynamics and control,intelligent control,robotics and complex *** is no surprise that she was selected as a representative introduced significantly in“Women in Control”of IEEE Control Systems Magazine.

关键词： control honor analysis

Failure analysis on China power grid based on power law

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控制理论与应用（英文版） 2006年第3期4卷 235-238页

作者： Xiaofeng WENG yiguang hong ancheng xue shengwei mei State Key Lab of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 China Institute of Systems Science Chinese Academy of Sciences Beijing 100080 China

This paper is concerned with the mechanism of blackouts in China power system from the viewpoint of self-organized criticality. By using two estimation algorithms of scaled window variance （SWV） and rescaled rangestatistics （R/S）, this paper studies the blackout data in China power system during 1988-1997. The result of analysis shows that the blackout data of 1994-1997 coincides well with the autocorrelation. Furthermore, it is found that the function of blackout probability vs. blackout size exhibits power law distribution.

关键词： Power system Blackout Power law Estimation algorithm

Viscosity solution to nonlinear H_∞ control

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Chinese Science Bulletin 1997年第11期42卷 890-894页

作者： hong yiguang, YUNG Siupang, mei shengwei and QIN Huashu1. Institute of Systems Science, Chinese Academy of Sciences, Beijing 100080, China 2. Department of Mathematics, hong Kong University, hong Kong, China Institute of Systems Science Chinese Academy of Scirnces Beijing China Department of Mathematics How Kong University Hong Kong China

where the state variable x∈R^n,the output z∈R^k,the control variable u∈U R^m,and thedisturbance w∈W R^l.U and W are compact.F,Z are C^1 mappings defined in a neigh-

关键词： nonlinear H∞ control viscosity solution disturbance attenuation.

A Special Issue:“Power Storage and Hydrogen Utilization Key Technologies”for Global Energy Interconnection

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Global Energy Interconnection 2024年第5期7卷 I0002-I0003页

作者： shengwei mei Zhao Xu Tsinghua University Qinghai University IEEE hong Kong Polytechnic University China

High-quality development of renewable energy is the necessary path to sustainably meet the growing energy demand and achieve carbon ***,wind and photovoltaic power generation have high volatility,which brings challenges to the safety and stability of the power system and the requirement of power system *** storage technology can effectively balance power supply and demand,and participate in system frequency and voltage regulation,improving the flexibility and reliability of the energy *** energy is a clean and efficient secondary energy source that can be directly applied in transportation,industry,and other *** can also be converted into stable chemical energy through electrolyzing water and being stored for a long period,which can help to improve the overall efficiency of the energy ***,the editorial department of Global Energy Interconnection has planned the special issue of“Power Storage and Hydrogen Utilization Key Technologies”.

关键词： Storage Power Utilization

Failure analysis on electric power system in our country based on power law

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Failure analysis on electric power system in our country bas...

New challenges for optimal design of nearly/net zero energy buildings under post-occupancy performance-based design standards and a risk-benefit based solution

第二十三届中国控制会议

作者： yiguang hong Xiaofeng Weng ancheng xue shengwei mei (Institute of Systems Science, Chinese Academy of Sciences, Beijing 100080, China) (Department of Electrical Engineering, Tsinghua university, Beijing 100084, China)

This paper is to employ power law approach to discuss self-organized criticality and related dynamical features of power systems. We use two estimation algorithms called scaled window variance (SWV) and rescaled range statistical (R/S) to analyze the data of blackout events during 1988-1997 of power systems in China. From the analysis we found that the data from 1994 to 1997 show the autocorrelation of the blackouts vs. time lags. Moreover, we find the power law distribution in blackout probability vs. event size.

关键词： Power systems Blackout Power law Estimation aigoritnm

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Building Simulation 2022年第5期15卷 685-698页

作者： Hangxin Li shengwei Wang Department of Building Environment and Energy Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina Research Institute for Smart Energy The Hong Kong Polytechnic UniversityKowloonHong KongChina

One of the challenges in construction of nearly and net ZEBs is how to truly achieve the nearly and net energy goals after building *** building design standards and practices are mostly based on design performance evaluation,but practices show that many designed nearly/net ZEBs failed to achieve the energy goals after building *** facilitate the practical achievement of nearly and net ZEBs,recently most of the newly-released ZEB design standards have turned to post-occupancy performance evaluation,posing great challenges to nearly and net ZEB ***,the detailed challenges have not be comprehensively investigated,and effective optimal design methods which can facilitate the achievement of nearly and net ZEBs under these standards are still *** this study,new challenges of nearly and net ZEB design under the post-occupancy performance-based design standards are fully investigated,and a risk-benefit based optimal design method is proposed to facilitate the achievement of nearly and net ZEBs under these *** newly-released ZEB standard in China is taken as an example to investigate the challenges and test the proposed *** show that nearly and net ZEBs designed using conventional design method have high risk in achieving energy goals under these standards due to high risk in satisfying the requirement regarding non-renewable primary energy consumption after building *** proposed design method is effective to facilitate achieving energy goals under these standards based on the risk that decision-makers would like to take.

关键词： zero energy building optimal design post-occupancy performance ZEB standard uncertainty analysis risk-benefit assessment

Spatial Pattern of Cotton Yield Variability and Its Response to Climate Change in Cotton Belt of Pakistan

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Chinese Geographical Science 2023年第2期33卷 351-362页

作者： YU Shan DU Wala ZHANG Xiang hong Ying LIU Yang hong mei CHEN Siyu College of Geographic Science Inner Mongolia Normal UniversityHohhot 010022China Inner Mongolia Key Laboratory of Remote Sensing and Geographic Information Systems Hohhot 010022China Institute of Grassland Research Chinese Academy of Agricultural SciencesHohhot 010000China College of Science Inner Mongolia University of TechnologyHohhot 010051China

Cotton is a revenue source for cotton-producing countries;as the second-largest crop in Pakistan,it significantly contributes to its *** the past few decades,cotton productivity has become unstable in Pakistan,and climate change is one of the main factors that impact cotton *** to climate change,it becomes very important to understand the change trend and its impact on cotton yield at the regional ***,we investigate the relationship of standardized cotton yield variability with the variability of climate factors using a 15-yr moving *** piecewise regression was fitted to obtain the trend-shifting point of climate *** results show that precipitation has experienced an overall decreasing trend of–0.64 mm/yr during the study period,with opposing trends of–1.39 mm/yr and 1.52 mm/yr before and after the trend-shifting point,*** found that cotton yield variability increased at a rate of 0.17%/yr,and this trend was highly correlated with the variability of climate *** multiple regression analysis explains that climate variability is a dominant factor and controlled 81%of the cotton production in the study area from 1990 to 2019,while it controlled 73%of the production from 1990 to 2002 and 84%from 2002 to *** findings reveal that climate factors affact the distinct spatial pattern of changes in cotton yield variability at the tehsil level.

关键词： cotton crop yield variability climate impact on cotton yield regression analysis 15-yr moving window Pakistan

Energy performance analysis of multi-chiller cooling systems for data centers concerning progressive loading throughout the lifecycle under typical climates

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Building Simulation 2024年第10期17卷 1693-1708页

作者： Yingbo Zhang Hangxin Li shengwei Wang Department of Building Environment and Energy Engineering The Hong Kong Polytechnic UniversityHong KongChina Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHong KongChina

The increasing demand for cooling energy in data centers has become a global *** studies lack a comprehensive analysis of the energy performance of widely used multi-chiller cooling systems in air-cooled data centers throughout their lifecycle,especially concerning progressive *** bridge this gap,this study conducts a thorough assessment of the energy performance of multi-chiller cooling systems throughout the entire ***,the impact of climate conditions on the energy efficiency of the cooling systems is analyzed,considering design variations for typical ***-chiller cooling system models are developed using the test data of cooling equipment and typical control *** energy performance of the cooling system is thoroughly analyzed under full-range cooling loads and climate *** show that free cooling time could differ up to 1442 hours at different part load ratios in the same ***,the cooling system’s coefficient of performance(COP)varies significantly,by up to 6,at different part load ratios,corresponding to a difference in power usage effectiveness(PUE)up to ***,the average cooling system COP throughout the lifecycle loading is found to be only 11.7,2.9 lower than the design system COP.

关键词： data center cooling system energy performance life-cycle operation power usage effectiveness(PUE) coefficient of performance(COP)

Impacts of technology-guided occupant behavior on air-conditioning system control and building energy use

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Building Simulation 2021年第1期14卷 209-217页

作者： Rui Tang shengwei Wang Shaobo Sun Department of Building Services Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina

Occupant behavior is an important factor affecting building energy *** studies have been conducted recently to model occupant behavior and analyze its impact on building energy ***,to achieve a reduction of energy consumption in buildings,the coordination between occupant behavior and energy-efficient technologies are essential to be considered simultaneously rather than separately considering the development of technologies and the analysis of occupant *** is important to utilize energy-efficient technologies to guide the occupants to avoid unnecessary energy *** study,therefore,proposes a new concept,“technology-guided occupant behavior”to coordinate occupant behavior with energy-efficient technologies for building energy *** occupants are involved into the control loop of central air-conditioning systems by actively responding to their cooling ***-site tests are conducted in a hong Kong campus building to analyze the performance of“technology-guided occupant behavior”on building energy *** to the measured data,the occupant behavior guided by the technology could achieve“cooling on demand”principle and hence reduce the energy consumption of central air-conditioning system in the test building about 23.5%,which accounts for about 7.8%of total building electricity use.

关键词： occupant behavior occupancy detection cooling demand control energy consumption HVAC system