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2019 4th Asia Conference on power and Electrical Engineering, ACPEE 2019

作者： Xu, Bo Zhang, Yumin Sun, Kongming State Grid Energy Research Institute Co. Ltd. Beijing China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Shandong Province Jinan250061 China State Grid Shandong Electric Power Research Institute Shandong Province Jinan250003 China

This paper investigates the impact of opportunistic maintenance strategy on power equipment maintenance scheduling under economic dependence. The model focuses on power equipment with two types of failures: random failure and deterioration failure. Unlike previous research which didn't consider opportunistic maintenance between different failures modes, opportunistic maintenance strategy is proposed in this paper. In the opportunistic maintenance strategy, whenever random failure occurs, decision has to be made on whether deterioration failure is preventively maintained based on the degree of equipment deterioration and economic dependence. Firstly, Markov process is used to describe equipment state-space diagram. And then, in order to determine the optimal inspection rate, preventive maintenance threshold and opportunistic maintenance threshold of power equipment, the analytical expressions of inspection cost, maintenance cost, repair cost and outage cost are quantified. Finally, the total cost is minimized to get the optimal maintenance strategy. Case studies demonstrate the feasibility of the proposed model. © Published under licence by IOP Publishing Ltd.

关键词： Deterioration

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A Transformer Fault Diagnosis Method Based on Bayesian Network 2

A Transformer Fault Diagnosis Method Based on Bayesian Netwo...

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2019 2nd International Conference on Advanced Algorithms and control Engineering, ICAACE 2019

作者： Zhe-Wen, Zhang Yong, Wang Ding, Ying Lei, Tian Ying-Jian, Zhou Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan Shandong Province250061 China State Grid of China Technology College Jinan Shandong Province250002 China State Grid Shandong Electric Power Company Finance Department Jinan Shandong Province250001 China

This paper summarizes the fault types and fault hazards of the transformer, and combs the corresponding relationship between the transformer fault types and the fault symptoms, which provides reference for the transformer fault diagnosis and state maintenance. Based on the analysis of the existing transformer fault diagnosis, the transformer fault diagnosis based on Bayesian network is mainly studied. Bayesian network has advantages in machine learning, data reasoning and so on. It has been widely applied in the field of fault diagnosis. In this paper, the QMR model of transformer fault diagnosis is established by using the principle of Bayesian network and the relationship between fault type and fault feature, and the model is used to diagnose the specific fault. Then the paper further analyzes the result of fault diagnosis in order to prove the correctness and validity of Bayesian network. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Bayesian networks

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Corrigendum to “ Atmospheric aging effects on aerosol ice nucleation” [Earth-Science Reviews, 269 (2025), 105176]

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Earth-Science Reviews 2025年

作者： Ziye Huang Wei Hu Jie Chen Jialei Zhu Zhijun Wu Yue Zhang Pingqing Fu Institute of Surface-Earth System Science School of Earth System Science Tianjin University Tianjin 300072 China Tianjin Bohai Rim Coastal Earth Critical Zone National Observation and Research Station Tianjin University Tianjin 300072 China State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing 100081 China Institute for Atmospheric and Climate Science ETH Zürich Zurich 8092 Switzerland Department of Atmospheric Sciences Texas A&M University College Station TX 77843 USA

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Integrated systems Modeling for Assessing the Water–Energy Nexus in Pakistan: Lessons Learned From Coupling LEAP–WEAP Planning Approaches

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Engineering 2025年

作者： Riaz Ahmad Gengyuan Liu Syed Aziz Ur Rehman Yuan Gao Fanxin Meng Xuanru Zhou Bojie Liu Silvio Cristiano State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China Beijing Engineering Research Center for Watershed Environmental Restoration & Integrated Ecological Regulation Beijing 100875 China Department of Environmental Sciences University of Veterinary and Animal Sciences Lahore 54000 Pakistan China Nuclear Power Engineering Co. Ltd. Beijing 100840 China Department of Architecture University of Florence Florence 50121 Italy

systems thinking is crucial in developing strategies for managing and allocating resources in complex scenarios. In the Global South, Pakistan faces challenges such as water scarcity and energy crises, which require integrated approaches. This study combines long-range energy alternatives planning (LEAP) with a water evaluation and planning system (WEAP) to explore potential strategies for managing interconnected water and energy resources in Pakistan. The aim of this work is to identify policy flaws and assess the consequences of water–energy decisions in Pakistan. The findings suggest that maintaining the current status quo will hinder Pakistan’s goal of reducing its water consumption by 30% by 2027 and its energy usage by 50% by 2030. Innovative modeling scenarios suggest that energy and water consumption reductions in the agricultural, domestic, industrial, and transport sectors could save up to 15% energy usage by 2050. However, water-saving strategies can inadvertently lead to increased energy consumption, particularly in the agricultural and industrial sectors, with projections reaching an additional 2.8 million tonnes of oil equivalent (MTOE) by 2050. Realizing Pakistan’s policy goals and meeting its targets present considerable challenges for the government, especially against the backdrop of severe economic conditions. Current policies necessitate significant investments of 145 billion PKR (∼500 million EUR or USD) for water conservation and an additional 10 billion PKR for energy-conservation measures by 2030. Despite international financial aid, the success of these initiatives is at risk due to political instability, administrative weaknesses, and institutional shortcomings.

关键词： Urban and regional energy governance Water spatial planning Water-energy nexus Sustainable development

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Research on inter-turn short circuit of armature windings in the multiphase synchronous generator-rectifier system

Research on inter-turn short circuit of armature windings in...

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作者： Sun, Yuguang Wang, Shanming Huang, Ziguo Mu, Shujun State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100084 China

The multiphase synchronous generator-rectifier system could provide an ideal DC power source for more electric aircraft (MEA). When the inter-turn short-circuit fault occurs in phase windings of the generator, a large short-circuit current would be introduced inside the armature windings, which could cause severe damages to the system for overheat in the windings and irons as well as huge electromagnetic forces on the end coils. To improve the reliability of the MEA, this study researches on the inter-turn fault of the multiphase generator-rectifier system, including the theoretical analysis, numerical simulation and experimental verification. A 12-phase system is taken for example, and a multi-loop mathematical model is built up to calculate all voltages and currents in the multiphase synchronous generator-rectifier system with armature inter-turn fault. Many factors are thoroughly considered in the model, including the location and short-turns of fault, space harmonics of air-gap magnetic field and the changing circuit topology of the system. The mathematical model is verified by fault experiment results. Moreover, the electric characteristics of the fault are summarised, which could provide a quantitative basis for early detection of the inter-turn faults in the multiphase generator-rectifier system. © 2018 Institution of Engineering and Technology. All rights reserved.

关键词： More electric aircraft

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Hohmann transfer via constrained optimization

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Frontiers of Information Technology & Electronic Engineering 2018年第11期19卷 1444-1458页

作者： Li XIE Yi-qun ZHANG Jun-yan XU State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer EngineeringNorth China Electric Power UniversityBeijing 102206China Beijing Institute of Electronic Systems Engineering Beijing 100854China

Inspired by the geometric method proposed by Jean-Pierre MAREC, we first consider the Hohmann transfer problem between two coplanar circular orbits as a static nonlinear programming problem with an inequality constraint. By the Kuhn-Tucker theorem and a second-order sufficient condition for minima, we analytically prove the global minimum of the Hohmann transfer. Two sets of feasible solutions are found: one corresponding to the Hohmann transfer is the global minimum and the other is a local minimum. We next formulate the Hohmann transfer problem as boundary value problems, which are solved by the calculus of variations. The two sets of feasible solutions are also found by numerical examples. Via static and dynamic constrained optimizations, the solution to the Hohmann transfer problem is re-discovered, and its global minimum is analytically verified using nonlinear programming.

关键词： Hohmann transfer Nonlinear programming Constrained optimization Calculus of variations

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Compound control method for DC–DC converter

Compound control method for DC–DC converter

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2019 Jiangsu Annual Conference on Automation, JACA 2019

作者： Tang, Yongwei Li, Juan Li, Shengquan Lin, Zhongwei Wang, Shuwang Department of Electrical Engineering School of Electrical Energy and Power Engineering Yangzhou University Yangzhou225127 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering North China Electric Power University Beijing102206 China

Considering the problems of internal and external disturbances, i.e. time-varying load, inaccurate system model and external uncertainties etc., a compound control strategy based on model predictive control (MPC) and non-linear extended state observer (ESO) are proposed to attenuate the output voltage fluctuation under continuous conduction mode (CCM) mode of the buck circuits. In addition, a non-linear ESO is used to observe all kinds of uncertainties caused by internal and external disturbances and to eliminate their effects by compensating these disturbances in the feed-forward channel. Compared with the pure MPC control, the simulation results show that the proposed composite control method has the better disturbance suppression effect and also can effectively improve the stability of the buck circuit. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Model predictive control

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Fault Diagnosis Method of Circuit Breakers Based on Weighted Fuzzy Petri Nets

Fault Diagnosis Method of Circuit Breakers Based on Weighted...

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2019 4th Asia Conference on power and Electrical Engineering (ACPEE 2019)

作者： Xiaotong Zhang Qing Chen Mengxuan Sun Wudi Huang Wangyuan Gao Key Laboratory of Power System Intelligent Dispatch and Control(Shandong University) Ministry of Education State Grid Nanjing Power Supply Company

The maintenance and self-healing of circuit breakers are very difficult when the fault diagnosis results of circuit breakers cannot cover all kinds of fault *** paper proposes a method for comprehensively diagnosing circuit breaker *** method simulates the action process of circuit breakers based on weighted fuzzy Petri nets and makes it feasible to infer circuit breaker fault causes from different *** model shows the action sequence of the circuit breaker by associating the control mechanism,the operating mechanism,the transmission mechanism and the contact part of the circuit breaker,and each part of it is described with the corresponding abnormal signals of the circuit breaker stored in the substation *** fault reasons of the circuit breaker can be inferred by considering the action sequence and the relationship between the abnormal information and fault *** results for some test cases show that this method can obtain the diagnosis results covering various possible fault causes.

关键词： net Petri Fault Diagnosis Method of Circuit Breakers Based on Weighted Fuzzy Petri Nets Fuzzy

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Publisher Correction: Ozone pollution mitigation strategy informed by long-term trends of atmospheric oxidation capacity

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Nature Geoscience 2024年 172页

作者： Wenjie Wang Xin Li Ying Liu Sihua Lu Yusheng Wu Shiyi Chen Keding Lu Min Hu Limin Zeng Min Shao Yuanhang Zhang Hang Su Yafang Cheng Ruijing Ni Ulrich Pöschl Zhaofeng Tan Franz Rohrer Andreas Wahner David D. Parrish Cheng Huang Xudong Tian K. M. Leung Liangfu Chen Meng Fan Qiang Zhang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing China State Key Laboratory of Atmospheric Environment and Extreme Meteorology Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Max Planck Institute for Chemistry Mainz Germany International Joint Laboratory for Regional Pollution Control Ministry of Education Beijing China Collaborative Innovation Centre of Atmospheric Environment and Equipment Technology Nanjing University of Information Science & Technology Nanjing China Institute of Carbon Neutrality Peking University Beijing China Institute for Environmental and Climate Research Jinan University Guangzhou China State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex Shanghai Academy of Environmental Sciences Shanghai China Institut für Energie-und Klimaforschung: Troposphäre (IEK-8) Forschungszentrum Jülich Jülich Germany Key Laboratory of Ecological and Environmental Monitoring Forewarning and Quality Control of Zhejiang Zhejiang Ecological and Environmental Monitoring Center Hangzhou China Environmental Protection Department The Government of the Hong Kong Special Administrative Region Hong Kong China State Key Laboratory of Remote Sensing Science The Aerospace Information Research Institute Chinese Academy of Sciences Beijing China Department of Earth System Science Tsinghua University Beijing China

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Optimization of electricity generation pattern in China from perspective of water scarcity

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Energy Procedia 2019年 158卷 3872-3877页

作者： Jiake Fang Saige Wang Yiyi Zhang Bin Chen Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University Nanning Guangxi 530004 China Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 P.R. China

Increasing electricity demand is exerting growing pressure on scarce freshwater resources. Especially in China, the spatial mismatch of energy and water caused water-shortage regions shoulder heavy electricity generation tasks. This spatial layout could further aggravate national water scarcity. In this paper, to provide insights for a more rational electricity generation-trade pattern, we built an electricity generation tasks redistribution model to optimize national electricity generation pattern. In this model, the objective function is minimizing the water use related to electricity generation for drier regions through transferring electricity generation tasks to adjacent wetter regions. The equality constraint condition is that the total amount of national electricity generation must sufficiently supply the total electricity demand. The inequality constraint is that the adjustment range of electricity generation of each province is limited by local installed capacity. The results show that, in the optimal scenario, the water consumption related to electricity generation of regions in water “shortage grade 1” and “shortage grade 2” (drier regions) can be decreased by 46% and 44%, respectively.

关键词： energy water nexus optimization water scarcity electricity generation

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