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Space Charge Transient Kinetic Characteristics in DC Air Corona Discharge at Atmospheric Pressure

Plasma Science and Technology 2014年第8期16卷 749-757页

作者：刘兴华咸日常孙学峰王涛吕学宾陈素红杨帆 state grid Zibo power Supply company state grid shandong electric power company state grid shandong electric power Research Institute state Key Laboratory of power Transmission Equipment & System Security and New Technology Chongqing University

Investigating the corona mechanism plays a key role in enhancing the performance of electrical insulation systems. Numerical simulation offers a better understanding of the physical characteristics of air corona discharges. Using a two-dimensional axisymmetrical kinetics model, into which the photoionization effect is incorporated, the DC air corona discharge at atmosphere pressure is studied. The plasma model is based on a self-consistent, multi-component, and con- tinuum description of the air discharge, which is comprised of 12 species and 22 reactions. The discharge voltage-current characteristic predicted by the model is found to be in quite good agree- ment with experimental measurements. The behavior of the electronic avalanche progress is Mso described. 0＋ and N＋ are the dominant positive ions, and the values of 0- and 02 densities are much smaller than that of the electron. The electron and positive ion have a low-density thin layer near the anode, which is a result of the surface reaction and absorption effect of the electrode. As time progresses, the electric field increases and extends along the cathode surface, whereas the cathode fall shrinks after the corona discharge hits the cathode; thus, in the cathode sheath, the electron temperature increases and the position of its peak approaches to the cathode. The present computational model contributes to the understanding of this physical mechanism, and suggests ways to improve the electrical insulation system.

关键词： air corona discharge atmospheric pressure numerical simulation mechanism

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Study on the water-tree ageing characteristics of polyethylene/organic montmorillonite and crosslinked polyethylene/organic montmorillonite nanocomposites

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High Voltage 2023年第2期8卷 262-273页

作者： Xiufeng Li Yunmeng Yang Qiang Wang Yuan Gao Wei Zhang Zhengdi Liu College of electrical and Electronic Engineering Shandong University of TechnologyZiboShandongChina state grid shandong electric power company Weihai Wendeng power Supply company WendengShandongChina

The dispersion state of nanoparticles affects the properties of composites,and the crosslinking process of polymers affects the dispersion state of *** order to investigate the effects of crosslinking behaviour on the water-tree ageing characteristics of nanocomposite dielectrics at the molecular level,polyethylene/organic-montmorillonite(PE/organic montmorillonite(OMMT))and crosslinked polyethylene/organic-montmorillonite(XLPE/OMMT)nanocomposites were prepared by the melt blending method,after which the accelerated water-tree ageing experiments were conducted using a needle *** transform infrared spectroscopy,differential scanning calorimetry,successive self-nucleation annealing and scanning electron microscope(SEM)tests were conducted to characterise the properties of the samples before and after watertree *** results indicate that the initiation probability and the length of water trees in XLPE/OMMT are less than those in PE/*** carbonyl index in the watertree area of the two nanocomposites increases,indicating that the water-tree ageing is the result of electrochemical *** crystallisability of the water-tree area degrades,decreasing the crystallinity and the lamellar *** growth of water trees destroys molecular chains and crystal structures,which results in local *** are many holes for the water tree growth in the PE/OMMT ***,the crosslinked meshwork not only restricts the movement of macromolecular chains but also increases the stability of the lamellar barrier effect of *** combination of the two effects significantly improves the water-tree resistance of the XLPE/OMMT nanocomposite.

关键词： composites tree characteristics

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Benefit allocation of electricity-gas-heat-hydrogen integrated energy system based on Shapley value

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Clean Energy 2023年第6期7卷 1381-1390页

作者： Yujiao Liu Yan Li Yiping Rong Guoliang Li Ruiqi Wang Haini Zhou Zaozhuang power Supply company of state grid shandong Province electric power company Zaozhuang CityShandong 277101China state grid shandong Integrated Energy Services Jinan CityShandong 250021China

The integrated energy system is an important development direction for achieving energy transformation in the context of the low-carbon development era,and an integrated energy system that uses renewable energy can reduce carbon emissions and improve energy utilization *** electric power network and the natural gas network are important transmission carriers in the en-ergy field,so the coupling relationship between them has been of wide *** paper establishes an integrated energy system considering electricity,gas,heat and hydrogen loads;takes each subject in the integrated energy system as the research object;anal-yses the economic returns of each subject under different operation modes;applies the Shapley value method for benefit allocation;and quantifies the contribution value of the subject to the alliance through different influencing factors to revise the benefit allocation *** with the independent mode,the overall benefits of the integrated energy system increase in the cooperative mode and the benefits of all subjects *** to the different characteristics of different subjects in terms of environmental benefits,collaborative innovation and risk sharing,the benefit allocation is reduced for new-energy subjects and increased for power-to-gas sub-jects and combined heat and power generation units after revising the benefit allocation,to improve the matching degree between the contribution level and the benefit allocation under the premise of increased profit for each *** cooperative mode effectively enhances the economic benefits of the system as a whole and individually,and provides a useful reference for the allocation of benefits of integrated energy *** analysis shows that the revised benefit distribution under the cooperative model increases by 3.86%,4.08%and 3.13%for power-to-gas subjects,combined heat and power generation units,and new-energy units,respectively,compared with the independent function m

关键词： integrated energy system power-to-gas Shapley value benefit allocation hydrogen energy

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A New Topology Pattern for AC-DC Mixed Microgrid

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Journal of Electronic Science and Technology 2016年第3期14卷 281-286页

作者： Peng Yu Yong Zhang Xing-Hua Liu Peng Zhao Sun Li Rui-Qi Wang Shu-Min Sun Guang-Lei Li Yu-Yao Qu Lin Li the state grid shandong electric power Research Institute Jinan 250002China the state grid Zibo electric power company Zibo 255000China the state grid shandong electric power Corporation Jin 250000Chin. the state grid Dongying electric power company Dongying 257100China the Zhongshi Yitong Group Co.Ltd. Jinan 250002China

In order to realize the modular design of the microgrid, this paper proposed a new modular topology for the AC-DC mixed microgrid. In that topology, the AC microgrid unit and the DC microgrid unit were packaged together by the back-to-back converter. The battery-supercapacitor hybrid energy storage system was connected to the DC bus of back-to-back converter. By the reasonable design on the battery-supercapacitor hybrid system, the energy storage system could supply the rapid power and energy support for the microgrid spontaneously. The mathematical model and the control algorithm of that microgrid topology were studied. By the simulation analysis, it can be concluded that AC-DC mixed modular microgrid topology could operate steadily on both the grid-connected mode and the isolated mode. Furthermore, we can conclude by the simulation that the designed modular microgrid could operate uninterrupted when the microgrid topology switched from the grid-connected mode to the isolated mode. The seamless switching became the natural property for the modular microgrid. As a result, the modular microgrid topology can be considered as a usual power/load module to realize the friendly power interaction with the power grid.

关键词： Microgrid topology energy storage mode switching operation mode.

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Analysis of the Quasi-Static Buffeting Responses of Transmission Lines to Moving Downburst

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Computer Modeling in Engineering & Sciences 2020年第7期124卷 287-302页

作者： Qigang Sun Jian Wu Dahai Wang Yue Xiang Haitao Liu Xiaobin Sun Economic and Technology Research Institute of state grid shandong electric power company Jinan250000China Wuhan University of Technology Wuhan430070China state grid shandong electric power company Jinan250000China

Downburst event is identified as a major cause to failure of transmission lines in non-coastal *** this paper,a novel nonlinear analytical frame for quasi-static buffeting responses of hinged and multi-span insulator-line systems are derived based on the theory of cable *** closed-form solutions are presented and applied to predict nonlinear response including displacements and other reactions of the system subjected to a moving downburst wind in a case *** and efficiency of the derived analytical frame are validated via comparisons with results from finite element method.

关键词： Downburst wind transmission line buffeting responses cable quasistatic

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Probabilistic production simulation of a power system with wind power penetration based on improved UGF techniques

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Journal of Modern power Systems and Clean Energy 2013年第2期1卷 186-194页

作者： Hongtao WANG Xu LIU Chunyi WANG Key Laboratory of power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250061China state grid Zhejiang electric power company Jiaxing Power Supply CompanyJiaxing 314001China state grid shandong electric power company Jinan 250001China

Universal Generating Function(UGF)techniques have been applied to Multi-state System(MSS)reliability analysis,such as long term reserve expansion of power systems with high wind power ***,using simple steady-state distribution models for wind power and large generating units in reliability assessment can yield pessimistic *** more accurately assess the power system reliability,UGF techniques are extended to dynamic probabilistic simulation analysis on two aspects of modelling ***,a principal component analysis(PCA)combined with a hierarchal clustering algorithm is used to achieve the salient and time-varying patterns of wind power,then a sequential UGF equivalent model of wind power output is established by an apportioning ***,other than the traditional two-state models,the conventional generator UGF equivalent model is established as a four discrete-state continuous-time Markov model by *** the construction process of such a UGF model,the state values are transformed into the integral multiples of one common factor by choosing proper common factors,thus effectively restraining the exponential growth of its state number and alleviating the explosion *** method is suitable for reliability assessment with dynamic probabilistic distributed random *** addition,by acquiring the clustering information of wind power,the system reliability indices,such as fuel cost and CO_(2) emissions through different seasons and on different workdays,are ***,the effectiveness of the method is verified by a modified IEEE-RTS 79 system integrated with several wind farms of historical hourly wind power data of Zhangbei wind farm in North China.

关键词： Multi-state system Reliability Universal Generating Function(UGF) Probabilistic production simulation Wind power

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Feasibility analysis and online adjustment of constraints in model predictive control integrated with soft sensor

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Chinese Journal of Chemical Engineering 2017年第9期25卷 1230-1237页

作者： Pengfei Cao Xionglin Luo Xiaohong Song College of electrical Engineering and Automation Shandong University of Science and Technology Research Institute of Automation China University of Petroleum state grid shandong electric power company Zibo power Supply company

Feasibility analysis of soft constraints for input and output variables is critical for model predictive control(MPC).When encountering the infeasible situation, some way should be found to adjust the constraints to guarantee that the optimal control law exists. For MPC integrated with soft sensor, considering the soft constraints for critical variables additionally makes it more complicated and difficult for feasibility analysis and constraint adjustment. Therefore, the main contributions are that a linear programming approach is proposed for feasibility analysis, and the corresponding constraint adjustment method and procedure are given as well. The feasibility analysis gives considerations to the manipulated, secondary and critical variables, and the increment of manipulated variables as well. The feasibility analysis and the constraint adjustment are conducted in the entire control process and guarantee the existence of optimal control. In final, a simulation case confirms the contributions in this paper.

关键词： Soft sensor Model predictive control Variable constraints Feasibility analysis

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Molecular dynamics simulations of the interaction between OH radicals in plasma with poly-β-1–6-N-acetylglucosamine

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Plasma Science and Technology 2020年第12期22卷 59-69页

作者： Shuhui YANG Tong ZHAO Jingxian CUI Zhiyun HAN Liang ZOU Xiaolong WANG Yuantao ZHANG School of electrical Engineering Shandong UniversityJi'nan 250061People's Republic of China state grid shandong electric power construction company Ji'nan 250061People's Republic of China

Cold atmospheric plasma shows a satisfactory ability to inactivate bacterial biofilms that are difficult to remove using conventional methods in some cases. However, the researches on the inactivation mechanism are not quite sufficient. Poly-β-1–6-N-acetylglucosamine(PNAG),which is one of the important components in some biofilms, was used as the research subject,and the related mechanism of action triggered by different concentrations of the OH in plasma was studied using reactive molecular dynamics simulations. The results showed that OH radicals could not only trigger the hydrogen abstraction reaction leading to cleavage of the PNAG molecular structure, but undergo an OH addition reaction with PNAG molecules. New reaction pathways appeared in the simulations as the OH concentration increased, but the reaction efficiency first increased and then decreased. The simulation study in this paper could, to some extent, help elucidate the microscopic mechanism of the interaction between OH radicals in plasma and bacterial biofilms at the atomic level.

关键词： cold atmospheric plasma molecular dynamics reactive oxygen species bacterial biofilm

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Stability Analysis and Control of DC Distribution System with electric Vehicles

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Energy Engineering 2023年第3期120卷 633-647页

作者： Zhijie Zheng Song Zhang Xiaolei Zhang Bo Yang Fang Yan Xiaoning Ge state grid shandong electric power company Economic and Technological Research Institute JinanChina state grid shandong electric power company Limited JinanChina state Nuclear electric power Planning Design&Research Institute company Limited BeijingChina

The DC distribution network system equipped with a large number of power electronic equipment exhibits weak damping characteristics and is prone to low-frequency and high-frequency unstable *** current interpretation of the oscillation mechanism has not been ***,this paper established the complete statespace model of the distribution system consisting of a large number of electric vehicles,characteristic equation of the distribution network system is derived by establishing a state-space model,and simplified reduced-order equations describing the low-frequency oscillation and the high-frequency oscillation are ***,based on eigenvalue analysis,the oscillation modes and the influence of the key system parameters on the oscillation mode are ***,impacts of key factors,such as distribution network connection topology and number of dynamic loads,have been discussed to suppress oscillatory instability caused by inappropriate design or dynamic ***,using the DC distribution example system,through model calculation and time-domain simulation analysis,the correctness of the aforementioned analysis is verified.

关键词： DC distribution network system oscillation instability reduced-order equivalent model damping control sensitivity analysis

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Integrated resources planning in microgrids considering interruptible loads and shiftable loads

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Journal of Modern power Systems and Clean Energy 2018年第4期6卷 802-815页

作者： Lan ZHU Xueying ZHOU Xiao-Ping ZHANG Zheng YAN Shuxin GUO Longjun TANG Department of electrical Engineering Shanghai Jiao Tong University School of electrical Engineering Shanghai University of Electric Power Pudong power Supply company State Grid Shanghai Municipal Electric Power Company School of Electronic Electrical and Systems EngineeringUniversity of Birmingham Zibo power Supply company State Grid Shandong Electric Power Grid Company East electric power Dispatch and Control Sub-Center State Grid Corporation of China

Demand response has the potential to bring significant benefits to the optimal sizing of distributed generation(DG) resources for microgrids planning. This paper presents an integrated resources planning model considering the impact of interruptible loads(ILs) and shiftable loads(SLs) in microgrids, which simultaneouslydeals with supply side and demand side resources and minimizes the overall planning cost of the microgrid. The proposed model can be applied to offer a quantitative assessment how IL and SL can contribute to microgrid planning. The pure peak clipping model with IL and SL is also provided for comparisons. Moreover, sensitivity analysis of parameters in the model is *** results confirm that the proposed model is an effective method for reducing the planning cost of microgrids. It was also found that the major contributing factors of IL and SL have great impact on the economic benefits of the proposed model in low-carbon economy environments.

关键词： Interruptible load(IL) Shiftable load(SL) Integrated resources planning(IRP) Load control Microgrid

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