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作者： Zecheng Li Yanying Sun Chen Feng State Grid Ningxia Electric Power Research Institute School of Mechanical Electronic and Information Engineering China University of Mining and Technology (Beijing) The Key Laboratory of Power System Intelligent Dispatch and Control Shandong University

Aiming at the problem that the flexible access of distributed photovoltaics to the distribution network affects its reliability,this paper establishes a model of the distributed photovoltaic output probability based on the typical output characteristics of distributed photovoltaics ***,the power grid risk assessment indicators are determined to facilitate the quantification of distribution network risks,including voltage over-limit,power over-limit,and load loss risk ***,a distribution network model containing distributed photovoltaic grid-connected is established on the MATLAB simulation platform,and the risk assessment of the distribution network containing distributed photovoltaic grid-connected is carried out.

关键词： distributed photovoltaic voltage limit power limit loss of load risk assessment

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State Estimation for Integrated Energy systems: Motivations, Advances, and Future Work

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IEEE Transactions on power systems 2024年

作者： Zhao, Junbo Srivastava, Ankur Guo, Ye Cetenovic, Dragan Lin, Yuzhang Levi, Victor Yin, Guanxiong Huang, Manyun Zhang, Tingting Li, Zhigang Chen, Yanbo Exposito, Antonio G. Zhang, Wen Zheng, Weiye Chakrabarti, Saikat Li, Yang Sharma, Ankush Kamwa, Innocent Guo, Qinglai Terzija, Vladimir Mili, Lamine University of Connecticut Department of Electrical and Computer Engineering StorrsCT06269 United States Tsinghua University Tsinghua-Berkeley Shenzhen Institute Shenzhen518055 China The University of Manchester Department of Eee ManchesterM13 9PL United Kingdom University of Kragujevac Faculty of Technical Sciences Čačak Čačak32000 Serbia New York University Department of Electrical and Computer Engineering NY11201 United States Tsinghua University Department of Electrical Engineering Beijing100084 China Hohai University College of Energy and Electrical Engineering Nanjing210098 China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan250061 China The Chinese University of Hong Kong-Shenzhen School of Science and Engineering Shenzhen518172 China North China Electric Power University School of Electrical and Electronic Engineering Beijing102206 China University of Sevilla Spain Sevilla41092 Spain South China University of Technology School of Electrical Power Engineering Guangzhou510641 China Indian Institute of Technology Kanpur Department of Electrical Engineering Kanpur208016 India Northeast Electric Power University School of Electrical Engineering Jilin132012 China Laval University Department of Electrical and Computer Engineering QuebecQCG1V 0A6 Canada Tsinghua University State Key Laboratory of Power Systems Department of Electrical Engineering Beijing100084 China Newcastle University School of Engineering Newcastle upon TyneNE1 7RU United Kingdom Virginia Polytechnic Institute and State University Bradley Department of Electrical and Computer Engineering Falls ChurchVA22043 United States

This paper summarizes the technical activities of a three-year-long IEEE Task Force (TF) on State Estimation (SE) for Integrated Energy systems (IES). It presents the formal definition and characteristics of IES, along with the comprehensive discussion on Electric power systems (EPS) model, and static and dynamic models associated with heating and natural gas systems. The paper also identifies the barriers of SE for IES, such as estimation modeling, observability analysis, and measurement requirements, together with addressing multi-scale dynamics. An extensive comparative analysis between Integrated Energy systems-State Estimation (IES-SE) and more established Electric power system-State Estimation (EPS-SE) is presented. The paper also provides future research needs and directions related to IES-SE. © 1969-2012 IEEE.

关键词： power system analysis

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Effects of Geometric Parameters on Performance of Rectangular Submerged Inlet for Aircraft

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Transactions of Nanjing University of Aeronautics and Astronautics 2021年第6期38卷 984-992页

作者： LIU Chao PEI Houju CHEN Changdong XU Wenbing YANG Kaijie Environment Control and Oxygen System Department Shanghai Aircraft Design and Research InstituteShanghai 201210P.R.China AVIC Nanjing Servo Control System Corporation Nanjing 210016P.R.China College of Energy&Power Engineering Jiangsu University of Science and TechnologyZhenjiang 212003P.R.China Key Laboratory of Aircraft Environment Control and Life Support MIITNanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China

To improve the comfortability and safety of aircraft,the demand of rectangular submerged inlets(RSIs)with low resistance is proposed to increase the inlet flow rate of ram air. A theoretical model is built to numerically analyze the effects of geometric parameters on the inlet mass flow rate of RSIs. The geometric parameters in question here encompass the aspect ratio of 2—4,the ramp angle of 6°—7°,the characteristic parameter of the throat of 0.20 —0.30,the ramp length of 939—1 337 mm,and the cone angle of 0° —3°. Simulation results demonstrate that the mass flow rate(MFR)is positively correlated with the aspect ratio,ramp angle,ramp length,and cone angle,and negatively correlated with characteristic parameter of the throat. Within the range of the geometric parameters considered,the RSI with the aspect ratio of 3,the ramp angle of 6°,the characteristic parameter of the throat of 0.20,the ramp length of 1 337 mm,and the cone angle of 3° obtains the largest MFR value of about 2.251 kg/s.

关键词： ram air system rectangular submerged inlet geometric parameter mass flow rate(MFR)

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Research on Fault Diagnosis Method of Distributed power Distribution Network Based on HHT and CNN

Research on Fault Diagnosis Method of Distributed Power Dist...

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第33届中国控制与决策会议

作者： Xiaodong Sun Huanxin Guan Yan Zhao Tieyan Zhang Yuri Wang Bo Yang School of Electric Power Shenyang Institute of Engineering State School of Renewable Energy Shenyang Institute of Engineering Key Laboratory of Regional Multi-energy System Integration and Control Liaoning Province School of Automation and Electrical Engineering Shenyang Ligong University State Grid Zhangye Power Supply Company

Accurate and reliable fault diagnosis is very important for improving relay protection performance and ensuring safe and stable operation of power *** paper presents a fault diagnosis method for distributed power distribution network based on convolutional neural *** fault occurs in the distribution network,FTU acquisition unit is used to sample the fault current and voltage signals of the distribution ***-Huang transform is applied to the fault signal,and a two-dimensional time-frequency energy matrix is *** the time-frequency energy matrix is input into the convolutional neural network to realize the fault type identification of transmission lines in the distribution network with distributed power *** simulation results show that the model in this paper improves the speed of fault diagnosis,makes the model more robust,and can determine and judge fault types more accurately and quickly.

关键词： power Distribution system with Distributed power Hilbert-Huang Transform Convolutional Neural Network Fault Classification

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A New Method to Estimate the Severity of Interturn Short-Circuit Fault for PMSM

A New Method to Estimate the Severity of Interturn Short-Cir...

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power systems and Electrical Technology (PSET), IEEE International Conference on

作者： Zhaofei Zeng Man Zhang Luan Chen Qi Huang Ding Sun Key Laboratory of Wi de-area Measurement and Control on Power System of Sichuan Province University of Electron ic Science and Technology of China Chengdu China 1University of Electronic Science and Technology of China Chengdu China Institute of Electronic and Information Engineering of UESTC in Guangdong UESTC in Guangdong Dongguan China Chengdu Univer sity of technology Chengdu China Key Laboratory of W ide-area Measurement and Control on Power System of Sichuan Province University of Electron ic Science and Technology of China Chengdu China

This paper proposes a new method to determine the number of shorted turns for permanent magnet synchronous motor (PMSM). At first, the equivalent circuit model of PMSM under both normal condition and inter-turn short-circuit (ITSC) fault are presented. Then, the procedure to estimate the severity of ITSC in PMSM is introduced. In detailed, the stator winding of PMSM at standstill is excited by a low AC voltage, the corresponding current can be measured including its amplitude and phase, finally, the severity estimation indicator is established based on the electromagnetic parameters, including amplitude and phase of voltage and current, phase inductance and resistance. The effectiveness of the proposed method is verified by some simulations, which illustrates that the proposed method have good accuracy in the number of shorted turns detection in the range from the fault-free state to the full-winding fault state. The method proposed in this paper can be directly implemented without installing complex equipment and additional sensors on the motor, and it has utility value in the maintenance of PMSM.

关键词： Resistance Voltage measurement Phase measurement power supplies Simulation Stator windings Sensor phenomena and characterization

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Liquid Metal Manifold Microchannel Heat Sink for Ultra-High Heat Flux Cooling

SSRN

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SSRN 2024年

作者： Zhang, Mingkuan Gao, Qi Zhao, Zhiyuan Guo, Luna Li, Xuan Zhang, Chao Zhang, Xudong Rao, Wei Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China School of mechanical engineering Tianjin University of Commerce Tianjin300134 China Institute of Refrigeration and Cryogenics Shanghai Jiao Tong University Shanghai200240 China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing Beijing100084 China CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences China Beijing Key Lab of CryoBiomedical Engineering and Key Lab of Cryogenics Beijing100190 China

The reduction in transistor dimensions and advancements in chip integration have led to a dramatic increase in the heat flux of chip. Advanced heat dissipation technology has become the pivotal in ensuring the normal operation of chips and fully utilizing chip performance. Room temperature liquid metal convection cooling technology has demonstrated its efficacy as a viable approach for addressing high heat flux heat dissipation. However, the smaller specific heat capacity of liquid metal leads to a large temperature rise, imposing a constraint on the progression of liquid metal cooling technology. To overcome this drawback, this paper proposed a liquid metal manifold channel structure designed to convert the continuous long-range flow into a segmented short-range flow. The good matching between liquid metal and manifold structures is adequately demonstrated through a comparison with alternative coolant and channel structure. The simulation results demonstrate the effectiveness of liquid metal manifold channel cooling in dealing with a heat flux of 1000 W/cm², ensuring that the maximum temperature of the chip remains below 351.7 K. Moreover, the convective heat transfer coefficient even reaches 106 W/(m2·K), which is ten times larger than that of water conventional microchannel heat sink. The orthogonal experiments were conducted to analyze how the structural parameters affect the dissipation performance, including the height of the microchannel, ratio of manifold length to fin length, length of fin in manifold, width of channel, and ratio of fin with to channel width. It concluded that the height of the microchannel has been identified as the most critical factor. This manifold structure mitigates the inherent limitation of the lower specific heat capacity of liquid metal, paving the way for effective thermal management of electronic devices subjected to ultra-high heat flux. © 2024, The Authors. All rights reserved.

关键词： Heat flux

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Variable Selection Method Based on Partial Mutual Information and Its Application to NOx Emission Prediction 39

Variable Selection Method Based on Partial Mutual Informatio...

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39th Chinese control Conference, CCC 2020

作者： Tianmu, Q.I.N. Jinzhe, Zhang Mo, Y.O.U. Tingting, Yang North China Electric Power Research Institute Co. Ltd. Beijing100045 China North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering Beijing102206 China

ISBN: (纸本)9789881563903

Data-driven modeling methods are widely used in industrial processes as the foundation of control and optimization. The selection of optimal variable set plays an important role in model performance. In order to enhance the model prediction accuracy, a partial mutual information (PMI) method was proposed to select the optimal variable set. Benchmarks were used to validate the effectiveness of PMI method. Then, PMI method was applied to select main influencing factors of NOx emission of coal-fired boiler and the selection results were used as inputs of three different data-driven models. The comparison between the models with or without variable selection was made. The results showed that the PMI method enhanced the model prediction accuracy and avoided the over-fitting problem. © 2020 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Coal fired boilers

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Enhancing heat dissipation and temperature uniformity of microchannel heat sinks using fractal gradient honeycomb-reverse Tesla valve configuration

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Case Studies in Thermal engineering 2025年 72卷

作者： Chun-Yu Chen Min Yang Yuanyuan Li Gui Lu School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 China State Key Laboratory of Space Thermal Control Technology Beijing Institute of Spacecraft System Engineering China Academy of Space Technology Beijing 100094 China

This study introduces a fractal gradient honeycomb-reverse Tesla valve configuration (HC-RTV-GD) to enhance heat transfer and temperature uniformity in high-flux thermal management systems. Through comparative analysis with conventional Tesla valves and honeycomb structures, the HC-RTV-GD leverages hierarchical bifurcation and controlled turbulence generation to achieve superior heat transfer performance. At high Reynolds numbers, the design significantly reduces thermal resistance and suppresses maximum wall temperatures while flattening longitudinal temperature gradients, mitigating thermal stress risks. The improved temperature uniformity stems from gradient-driven flow redistribution, which minimizes stagnant zones and sustains coolant velocity in secondary channels. Thermal improvements come with hydraulic trade-offs: the gradient geometry amplifies flow resistance through localized vortices, elevating pressure drop and friction coefficients compared to conventional designs. Performance evaluation confirms the HC-RTV-GD’s viability exclusively in high-flux scenarios, where heat transfer gains outweigh pumping penalties. A neural network-enhanced optimization framework further identifies optimal coolant parameters, balancing thermal and hydraulic efficiency. The HC-RTV-GD advances cooling system design by strategically combining geometric complexity with turbulence control, prioritizing thermal uniformity in extreme heat flux environments.

关键词： Temperature uniformity Fractal gradient Honeycomb-reverse Tesla valve NSGA-II

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Research on Demand Response Strategy of Integrated Energy system Based on Hybrid Particle Swarm Optimization with Roulette Wheel Operator

Research on Demand Response Strategy of Integrated Energy Sy...

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第33届中国控制与决策会议

作者： Shuying Ren Yan Zhao Tieyan Zhang Yuri Wang Lin Tong School of Elecrtic Power Shenyang Institute of Engineering School of Renewable Energy Shenyang Institute of Engineering Key Laboratory of Regional Multi-energy System Integration and Control Liaoning Province School of Automation and Electrical Engineering Shenyang Ligong University Huludao Power Supply Company State Grid Liaoning Electric Power Supply Co.Ltd.

As one of the core elements of the technology base of the smart energy industry,the comprehensive energy system standard plays a link and catalytic role in promoting China's energy equipment manufacturing,the safe and stable operation of power systems,and the industrialization of scientific and technological *** response can play an important role in the consumption of renewable energy in integrated energy *** paper establishes an objective function to minimize the cost of integrated energy system and optimize user power *** the multiple objective functions and constraints,the traditional single objective optimization model can no longer meet the present problem *** view of the demand response in the integrated energy system,a multi-objective optimization method,the hybrid particle swarm algorithm with roulette operator,is *** algorithm can make the game *** partial optimal solution is spread globally to find the optimal scheduling strategy.

关键词： Integrated energy Demand response Particle swarm optimization Multi-objective optimization and photovoltaic power generation

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Scalable manufacture of ultratough physical cross-linked hybrid films for durable radiative cooling

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Chemical engineering Journal 2025年 518卷

作者： Guanghao Zhu Zhen Yan Wenjin Yao Huatian Zhai Qiang Li Desong Fan MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power Engineering Nanjing University of Science and Technology Nanjing Jiangsu 210094 China National Key Laboratory of Spacecraft Thermal Control Institute of Spacecraft System Engineering Beijing 100010 China

Passive radiative cooling (PRC) presents a promising innovation for zero-energy consumption and environmental cooling. However, recent advances in elucidating these PRC properties have so-far delivered few real-world applications, which require both up-scaling fabrication and long-term environmental stability. Here, we report a novel physical cross-linked melt-rolling-stretching process to develop metre-scale hybrid ultratough PRC films (MHTF), where the polypropylene (PP) and styrene–ethylene–butylene–styrene (SEBS) form a robust thermoplastic interpenetrating polymer network (TIPN). Impressively, MHTF achieves a high production with an annual output of 100,000 square meters, laying a solid foundation for the industrialization of radiative cooling technologies. The obtained MHTF film shows both ideal stress (12.9 MPa), ultrahigh strain (1790.1 %), ultrahigh toughness (213.7 MJ m −3 ), excellent solar reflectance (93.9 %), and mid-infrared (MIR) emittance (95.4 %). These high-quality films provide continuous sub-ambient cooling in an outdoor setting with a temperature drop of ~5.8 °C and ~6.7 °C during the daytime and nighttime, respectively, demonstrating energy-saving potential on a worldwide scale. Additionally, we further confirm the outdoor aging resistance, self-cleaning properties, and wearability of MHTF. This method, which opens up new avenues for the mass production of high-fgure-of-merit PRC films, is expected to accelerate the commercialization and arrival of the PRC era in real-world applications.

关键词： Mass production Physical cross-linked Radiative cooling Thermoplastic interpenetrating polymer network Ultratough

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