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2017 IEEE Conference on Energy Internet and Energy system Integration, EI2 2017

作者： Liu, Qian Ding, Lei Wang, Xiaohui Gao, Yadong Jin, Fei Wu, Jinyu Liu, Xiaoliang Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China Zhejiang Huayun Electric Power Engineering Design and Consulting Co. Ltd Hangzhou China Weifang Power Supply Company State Grid Shandong Electrical Power Company Weifang China

ISBN: (纸本)9781538614273

The penetration of DGs in modern distribution system brings more uncertainty. GMM (Gaussian Mixture Model) provides an effective way to represent the output distribution of DGs. The current used state estimator is based on WLS method which assumes the error information is Gaussian distributed. To successfully conduct the WLS based state estimation with GMM output, weights information of all the measurements is required. An effective approach to set reasonable weights for the measurements information is proposed in this paper with the purpose to improve the estimation quality with scarce real-time measurements. A simulation is conducted with ukgds-95 system with matlab software to validate the proposed method. © 2017 IEEE.

关键词： state estimation

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Driving factors of carbon dioxide emissions in China： an empirical study using 2006-2010 provincial data

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Frontiers of Earth Science 2017年第1期11卷 156-161页

作者： Yu LIU Zhan-Ming CHEN Hongwei XIAO Wei YANG Danhe LIU Bin CHEN Institute of Policy and Management Chinese Academy of Sciences Beijing 100190 China Department of Energy Economics School of Economics Renmin University of China Beijing 100872 China National Academy of Development and Strategy Renmin University of China Beijing 100872 China Economic Forecasting Department State Information Center Beijing 100045 China School of Economics and Management Beijing University of Chemical Technology Beijing 100029 China School of Humanities and Social Science Beijing Institute of Technology Beijing 100081 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China

The rapid urbanization of China has increased pressure on its environmental and ecological well being. In this study, the temporal and spatial profiles of China＇s carbon dioxide emissions are analyzed by taking heterogeneities into account based on an integration of the extended stochastic impacts using a geographically and temporally weighted regression model on population, affluence, and technology. Population size, urbanization rate, GDP per capita, energy intensity, industrial structure, energy consumption pattern, energy prices, and economy openness are identified as the key driving factors of regional carbon dioxide emissions and examined through the empirical data for 30 provinces during 2006-2010. The results show the driving factors and their spillover effects have distinct spatial and temporal heterogeneities. Most of the estimated time and space coefficients are consistent with expectation. According to the results of this study, the heterogeneous spatial and temporal effects should be taken into account when designing policies to achieve the goals of carbon dioxide emissions reduction in different regions.

关键词： carbon dioxide emission heterogeneity space spillover

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Characteristics of the Turbulent Transfer Processes of the Winter 2016 Heavy Haze Pollution in the Beijing Region

Characteristics of the Turbulent Transfer Processes of the W...

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第34届中国气象学会年会

作者： Yan Ren Shuwen Zheng Wei Wei Hongsheng Zhang Xuhui Cai Yu Song Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking University State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences State Key Joint Laboratory of Environmental Simulation and Pollution Control Department of Environmental SciencePeking University

In this paper,the structures and transfer characteristics of turbulence,the structure and evolution of the wind profile in the atmospheric boundary layer,and their relationship with the aerosol concentration during the different periods in the development of heavy haze pollution were analyzed using turbulence data for the period from December 6,2016,to January 9,2017,collected at Peking University's Atmospheric Science and Environment Observation *** results showed a negative correlation between the wind speed and the PM2.5 and PM1 *** the pollution level was low,the turbulence kinetic energy(TKE) was rather large and presented obvious diurnal *** TKE was low under heavy haze pollution *** both clear and heavy haze conditions,relation between non-dimensional wind speed components and the stability parameter z/L follows "1/3 power law",but the wind speed normalized standard deviations were smaller during heavy pollution periods than during clear periods under near-neutral *** unstable condition,the normalized standard deviation of the potential temperature σθ/|θ*| was related to z/L approximately following the "-1/3 power law",and the ratio during days with pollution was greater than the ratio during clear *** turbulence energy spectra of the wind speed in three directions satisfies the-2/3 power exponent rate in the high frequency *** the low frequency band,the wind velocity spectrum curve was distributed along with the stability parameters under clear conditions and was not related to the atmospheric stratification under polluted *** the dissipation stage of heavy pollution,the horizontal wind speedstarted increasing at high altitude and then passed gradually to lower *** strong upward motion during this stage was an important dynamic factor in the dissipation of the heavy haze pollution.

关键词： haze turbulence wind profile atmospheric boundary layer Beijing metropolitan area

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simulation of agricultural non-point source pollution in Xichuan by using SWAT model

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IOP Conference Series: Earth and Environmental Science 2018年第1期113卷

作者： Linan Xing Jiane Zuo Fenglin Liu Xiaohui Zhang Qiguang Cao School of Biological Engineering Beijing Polytechnic Beijing China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing China

This paper evaluated the applicability of using SWAT to access agricultural non-point source pollution in Xichuan area. In order to build the model, DEM, soil sort and land use map, climate monitoring data were collected as basic database. The SWAT model was calibrated and validated for the SWAT was carried out using streamflow, suspended solids, total phosphorus and total nitrogen records from 2009 to 2011. Errors, coefficient of determination and Nash-Sutcliffe coefficient were considered to evaluate the applicability. The coefficient of determination were 0.96, 0.66, 0.55 and 0.66 for streamflow, SS, TN, and TP, respectively. Nash-Sutcliffe coefficient were 0.93, 0.5, 0.52 and 0.63, respectively. The results all meet the requirements. It suggested that the SWAT model can simulate the study area.

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Optimization of LNG Terminal Reserve Planning for Combined Gas and Electricity system

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Energy Procedia 2017年 105卷 3332-3338页

作者： Gang Chen Qinzhe Liu En Lu Qixin Chen Guangdong Provincial Electric Power Dispatching Center Yuexiu District Guangzhou Guangdong Province 510600 China State Key Lab of Control and Simulation of Power System and Generation Equipment (Department Electrical Engineering Tsinghua University) Haidian District Beijing 100084 China

Considering the effect of LNG supplying risk on the combined gas and electricity system's operation under the multi-gas-source supply background, the optimization planning model of the combined system's LNG reserve is developed in this paper. The optimization objective of this model is minimizing the annual cost of combined system, considering operation simulation of several typical scenarios along 52 weeks in a whole year and the annualized investment of LNG tanks. The operation objective of each scenario is determined by LNG's arrival and the operation mode of LNG terminals. A test system of IEEE-39 test system and Belgian 20-node system is formulated. The optimal LNG reserve of the test system is solved, and the effect of load level and operation mode on the reserve planning is also analyzed.

关键词： Combined gas and electricity system LNG supply Reserve planning Natural gas system Operation mode

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Steady-state harmonic response analysis of a stranded wire helical spring-mass system using an iterative harmonic balance method

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JVC/Journal of Vibration and control 2016年第6期22卷 1449-1461页

作者： Zhao, Yu Wang, Shilong Zhou, Jie Li, Chuan Yang, Wenhan State Key Laboratory of Mechanical Transmission Chongqing University Chongqing400044 China Engineering Laboratory for Detection Control and Integrated System Chongqing Technology and Business University Chongqing China

As a cylindrical spring wound by a wire strand, the stranded wire helical spring has been widely used as key repositioning components for high-end devices. Most of these devices can be simplified as single degree-of-freedom (DOF) stranded wire helical spring-mass systems. The steady-state harmonic response analysis method is an important tool for designing a system with the nonlinear spring. The present work proposes an iterative harmonic balance method to solve for the steady-state harmonic response of the single DOF stranded wire helical spring-mass system. Taking into account the nonlinearity of the stranded wire helical spring, a nonlinear model comprising a modified Bouc-Wen equation was proposed for describing the dynamic nature of the spring-mass system. Based on the harmonic balance method and nonlinear iterative methods, the seeking for the response solution was transformed into a nonlinear optimization issue for the nonlinear spring-mass system. The present method was examined using both simulations and experiments. The results show that the proposed approach is simple yet accurate, and thus being very practical for engineering applications. © The Author(s) 2014.

关键词： Wire

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Integrated Train Ground Radio Communication system Based TD-LTE

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Chinese Journal of Electronics 2016年第4期25卷 740-745页

作者： ZHAO Hongli CAO Yuan ZHU Li XU Wei National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University National Mobile Communications Research Lab. Southeast University

In existing metro systems,the train ground radio communication system for different applications are deployed *** and constructing the communication infrastructures repeatedly wastes substantial social resources,and it brings difficulties to maintain all these *** present the communication Quality of service(Qo S) requirement for different train ground radio *** integrated TD-LTE based train ground radio communication system for the metro system(LTE-M) is designed *** order to test the LTEM system performance,an indoor testing environment is set *** channel simulator and programmable attenuators are used to simulate the real metro *** test results show that the designed LTE-M system performance satisfies metro communication requirements.

关键词： Communication based train control(CBTC) Train control LTE-M Performance test

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Modeling and simulation of DC micro-grid based on virtual motor control

Modeling and simulation of DC micro-grid based on virtual mo...

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2017 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2017

作者： Yi, Wei Yi, Dawei Hu, Xiongwei Wang, Xiangnv Shi, Fang Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University 17923 Jingshi Road Jinan China National Joint Engineering Laboratory of Power Grid with Electric Vehicles 17923 Jingshi Road Jinan China State Grid Heilongjiang Power Corporation Harbin Electricity Power Supply Company 188 Shangzhi Road Harbin China

ISBN: (纸本)9781538628942

A flexible DC micro-grid model is proposed, which is suitable for grid-connected renewable energy and energy storage. The complete circuit topology and its corresponding control strategy are given, which can make sure energy reliability, and can automatically achieve a reasonable power distribution. In addition, based on the theory of Virtual Generator (VG), a complete control strategy of each interface is proposed, that is, the Virtual DC Generator (VDG) control strategy is adopted in the load and energy storage unit, and the Virtual Synchronous Generator (VSG) control strategy is adopted in the grid connection interface. VSG has the similar active and reactive power adjustment ability to the synchronous generator. The voltage amplitude and frequency of the grid- connected inverter are adjustable. It can simulate the inertia and damping characteristics of the synchronous generator, and overcome the impact of the traditional grid-connected inverter without inertia to the grid, which can effectively enhance the ability of the grid to accept renewable energy. What's more, the model of electric vehicles is considered into the micro-grid to meet the future trend of power grid. simulation and experimental results verify the validity and reliability of the proposed. © 2017 IEEE.

关键词： DC-DC converters

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强厄尔尼诺期间大气环流对华北地区灰霾的影响

强厄尔尼诺期间大气环流对华北地区灰霾的影响

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第24届中国大气环境科学与技术大会暨中国环境科学学会大气环境分会2018年学术年会

作者： Ge Zhang Yang Gao Wenju Cai L.Ruby Leung Shuxiao Wang Bin Zhao Minghuai Wang Huayao Shan Xiaohong Yao Huiwang Gao Key Laboratory of Marine Environmental Science and Ecology Ministry of EducationOcean University of Key Laboratory of Marine Environmental Science and Ecology Ministry of EducationOcean University of Physical Oceanography Laboratory/CIMST Ocean University of China and Qingdao National Laboratory for Atmospheric Sciences and Global Change Division Pacific Northwest National LaboratoryRichlandWashi State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsi Joint Institute for Regional Earth System Science and Engineering and Department of Atmospheric and School of Atmospheric Sciences Nanjing UniversityNanjing210023China

利用全国PM2.5监测网数据分析发现，华北地区在 2015 年 12 月和 2016 年 1 月出现 PM2.5 浓度异常高、低的跷跷板现象，此现象可能与强厄尔尼诺和北极涛动(AO)共同导致的局地气象变化有关.

关键词：灰霾强厄尔尼诺北极涛动东亚冬季风 WRF-CMAQ

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A prediction model for traffic emission based on interval-valued intuitionistic fuzzy sets and case-based reasoning theory

A prediction model for traffic emission based on interval-va...

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作者： Wei, Ming Dai, Qiuxia State Key Joint Laboratory of Environment Simulation and Pollution Control Beijing China Jiangsu Key Laboratory of Urban ITS Southeast University Nanjing China

Prediction of traffic emission is very important to management actions for traffic emission reduction. To overcome the shortcomings of ordinary prediction methods in previous studies, a novel model for the prediction of traffic emission is proposed for the combination of interval-valued intuitionistic fuzzy sets and case-based reasoning theory. Based on analysis of the factors that affect the traffic emission, a characteristic factor matrix of the source cases was constructed. Then, an interval-valued intuitionistic fuzzy set was introduced in order to describe the uncertainty of the case, and the source case that was the most similar to the target case, was picked out by calculating the similarities between the source cases and the target case, therefore leading to the improvement in prediction accuracy. Finally, a case study was conducted to evaluate the effectiveness of the constructed prediction model. © 2016 - IOS Press and the authors. All rights reserved.

关键词： Forecasting

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