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Vibration and acoustic noise emitted by dry-type air-core reactors under PWM voltage excitation

AIP Advances 2018年第5期8卷

作者： Jingsong Li Shanming Wang Jianfeng Hong Zhanlu Yang Shengqian Jiang Shichong Xia State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China

According to coupling way between the magnetic field and the structural order, structure mode is discussed by engaging finite element (FE) method and both natural frequency and modal shape for a dry-type air-core reactor (DAR) are obtained in this paper. On the basis of harmonic response analysis, electromagnetic force under PWM (Pulse Width Modulation) voltage excitation is mapped with the structure mesh, the vibration spectrum is gained and the consequences represents that the whole structure vibration predominates in the radial direction, with less axial vibration. Referring to the test standard of reactor noise, the rules of emitted noise of the DAR are measured and analyzed at chosen switching frequency matches the sample resonant frequency and the methods of active vibration and noise reduction are put forward. Finally, the low acoustic noise emission of a prototype DAR is verified by *** the request of the authors, this article is being retracted effective 30 October 2018.

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Effect of adoption of electric vehicles on public health and air pollution in China: a modelling study

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The Lancet Planetary Health 2021年 5卷 S8-S8页

作者： Daniel E Horton Jordan L Schnell Daniel R Peters David C Wong Xi Lu Hao Gao Hongliang Zhang Patrick L Kinney Department of Earth and Planetary Sciences and Institute for Sustainability and Energy Northwestern University Evanston IL USA Cooperative Institute for Research in Environmental Sciences at the University of Colorado Boulder National Oceanic and Atmospheric Administration Global Systems Laboratory Boulder CO USA Program in Environmental Sciences Northwestern University Evanston IL USA Environmental Defense Fund Austin TX USA US Environmental Protection Agency Research Triangle Park NC USA School of Environment State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing China Beijing China Department of Earth System Science University of California Irvine Irvine CA USA Department of Environmental Science and Engineering Fudan University Shanghai China Department of Environmental Health Boston University School of Public Health Boston MA USA

Background Adoption of electric vehicles has the potential to reduce air pollutant and greenhouse gas emissions, hence China has implemented policies incentivising use of electric vehicles. However, much is unknown about the potential air quality and public health benefits of electric vehicles, including optimal vehicle type prioritisation and the vehicles' ability to reduce acute health impacts due to extreme air quality events. We aimed to assess the potential climate and acute public health benefits of use of electric vehicles during an extreme winter air pollution event. Methods In this modelling study, we used the Weather Research Forecast and Community Multiscale Air Quality Modeling system air quality model to simulate the interplay between weather and atmospheric chemistry. We used this model to examine potential co-benefits of electric vehicle adoption during an extreme pollution episode in China. We simulated heavy-duty and light-duty electric vehicle adoption scenarios, in which 40% of the population adopted a heavy-duty or light-duty passenger electric vehicle, re-mapped battery power needs to energy generation facilities, and characterised differences in public health outcomes using China-specific concentration-response functions. Findings We found that widespread adoption of heavy-duty electric vehicles would reduces nitric oxide and fine particulate matter resulting in 562 (95% CI 410–723) fewer premature acute deaths than the non-electrified baseline scenario. However, widespread adoption of heavy-duty electric vehicles does not reduce carbon dioxide emissions without the addition of emission-free electricity generation. By contrast, widespread adoption of light-duty electric vehicles robustly reduces greenhouse gas emissions, but results in lesser air quality improvements and fewer premature deaths avoided (145 [95% CI 38–333]) than the heavy-duty scenario. Economic effects of human health endpoints and carbon dioxide reductions for adoption of ligh

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Energy Optimization Dispatching of Microgrid in The Stand-alone Mode

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Journal of Physics: Conference Series 2019年第1期1304卷

作者： Li Sun Shujian Zhao Chenglian Ma Jing Jiang Yuanzhu Meng Tianliang Yao Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin Jilin 132012 China Power Research Institute of State Grid Jilin Electric Power Co. Ltd. Changchun Jilin 130021 China Jilin Power Supply Company State Grid Jilin Electric Power Co. Ltd. Jilin Jilin 132001 China Gansu Electric Power Design Institute Limited Company of China Energy Construction Group Lanzhou 730050 China

A microgrid system in the stand-alone mode with photovoltaic, wind turbine, microturbine, fuel cell and energy storage unit is studied. Mathematical models of different distributed power supply and energy storage devices are established. The load demand of the system, the price of purchasing and selling electricity when interacting with the power grid and other constraints are considered. An economic model for optimizing stand-alone operation cost is established. According to the characteristics of the model, an improved genetic algorithm is selected to optimize the nonlinear system. The algorithm has better stability in solving the optimization problem of large state space dimension. The case study show that the proposed economic model is reasonable and the algorithm is effective.

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Economic Optimal Dispatch of Grid-connected Microgrid Based on Improved Genetic Algorithm

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Journal of Physics: Conference Series 2019年第1期1304卷

作者： Li Sun Shujian Zhao Chenglian Ma Naixin Chen Tianliang Yao Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin Jilin 132012 China Power Research Institute of State Grid Jilin Electric Power Co. Ltd. Changchun Jilin 130021 China Changchun Power Supply Company State Grid Jilin Electric Power Co. Ltd. Changchun Jilin 130000 China Gansu Electric Power Design Institute Limited Company of China Energy Construction Group Lanzhou 730050 China

Nowadays, the demand for energy is expanding, the fossil resources are on the verge of exhaustion, and the ecological environment is getting worse and worse. In this form, this paper studies the economic optimal dispatch of microgrid under the background of energy saving and emission reduction. Firstly, the mathematical model of microgrid composed of distributed power, energy storage devices and loads is established. Secondly, under the background of energy saving and emission reduction, the objective function of multi-objective optimal operation of microgrid is established considering both economic and environmental aspects. Finally, the improved Genetic Algorithm is used to solve the objective function. The results of optimization can reduce microgrid system generation cost.

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Framework and applications of WAMS light communication system

Framework and applications of WAMS light communication syste...

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

作者： Cao, Benqing Ochani, Manesh Kumar Zhang, Hengxu Xie, Wei Liu, Jinsong Bao, Hailong Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan250061 China State Grid Shanghai Municipal Electric Power Company Shanghai200437 China Electric Power Research Institute State Grid Shanghai Municipal Electric Power Company Shanghai200437 China

ISBN: (纸本)9781538614273

The dynamic response of distribution network is becoming more and more complicated, as the rapid development of renewable energy. Wide Area Measurement system light (WAMS Light) can monitor the distribution network synchronously. The communication of real-time and high-speed data has been put on the research agenda. Firstly, analyzes the existing communication network of distribution network, and proposes to use Long Term Evolution (LTE, 4G) for WAMS Light. Secondly, discusses the IEC 60870-5-101 and the IEEE C37.118.2 protocol, and puts forward suggestions for the WAMS Light protocol. Thirdly, studies the communication security, and suggests using DES and RSA algorithm based on key Distribution Center (KDC) in WAMS Light. Finally, the main station has received the PMU Light data smoothly through a platform containing PMUs Light and simulated PMUs Light. This means 4G, WAMS Light communication protocol, DES and RSA based KDC can be used in the communication of WAMS Light. © 2017 IEEE.

关键词： Phasor measurement units

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Modeling and simulation of air-gapped current transformer based on Preisach Theory

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Protection and control of Modern power systems 2017年第1期2卷 111-121页

作者： Ya Hui Wu Xin Zhou Dong Sohrab Mirsaeidi State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

Current Transformer(CT)modeling,by which CT’s characteristics can be studied has a significant importance in CT selection and *** spite of numerous studies about closed-core CT model,only a few works have been conducted on air-gapped ones with the following problems:models of which required data is easily-accessible,have poor simulations of magnetization process;on the contrary,models which have satisfactory simulations,are hard to be established because of the hard-to-get required ***,based on Preisach Theory,a novel air-gapped CT model is deduced from the closed core CT *** proposed model is accurate and can be established *** saturation and remanence properties of closed-core CT and air-gapped CT are simulated and compared.

关键词： CT modeling Air gap Preisach Theory Saturation Remanence

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Review on distribution network planning methods considering large-scale access of flexible load

Review on distribution network planning methods considering ...

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IEEE Conference on Energy Internet and Energy system Integration

作者： Weihong Yang Lin Cheng Ning Qi Yanru Liu Xuyang Wang State Power Economic Research Institute State Grid Corporation of China Beijing China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China

With the rapid development of active distribution network and demand-side response, the effective utilization of large-scale flexible load is one of the main trends of the future distribution network development. In this paper, Energy Internet demonstration park has become the focus of international academy and industry. In this paper, shortcomings of the existing methods and new methods in load forecasting, power, and energy balance and planning evaluation are proposed, which emphasize mostly on the impact of flexible load on the distribution network. Then, the planning optimization method considering flexible load is discussed, and the relevant theoretical results are summarized from the aspect of uncertainty, multi-objective and multi-agent. Finally, the relevant technologies of future distribution network planning are prospected.

关键词： Distribution network planning Flexible load Active distribution network Planning method

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Attribution of PM_(2.5) exposure in Beijing-Tianjin-Hebei region to emissions:implication to control strategies

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Science Bulletin 2017年第13期62卷 957-964页

作者： Xin Li Qiang Zhang Yang Zhang Lin Zhang Yuxuan Wang Qianqian Zhang Meng Li Yixuan Zheng Guannan Geng Timothy J.Wallington Weijian Han Wei Shen Kebin He Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua University Department of Marine Earthand Atmospheric SciencesNorth Carolina State University Collaborative Innovation Center for Regional Environmental Quality Laboratory for Climate and Ocean-Atmosphere Sciences Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking University Department of Marine Sciences Texas A&M University at Galveston Department of Atmospheric Sciences Texas A&M UniversityCollege Station National Satellite Meteorological Center China Meteorological Administration Research and Advanced Engineering Ford Motor Company Asia Pacific Research Ford Motor Company State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua University

The Beijing-Tianjin-Hebei （BTH） region is one of the most heavily polluted regions in China, with both high PM2.5 concentrations and a high population density. A quantitative source-receptor relationship can provide valuable insights that can inform effective emission control strategies. Both source appor- tionment （SA） and source sensitivity （SS） can provide such information from different perspectives. In this study, both methods are applied in northern China to identify the most significant emission cate- gories and source regions for PMz5 exposure in BTH in 2013. Despite their differences, both models show similar distribution patterns for population and simulated PM2.5 concentrations, resulting in overall high PM2.5 exposure values （approximately 110 Ixg/m3） and particularly high exposure values during the win- ter （approximately 200 ktg/m3）. Both methods show that local emissions play a dominant role （70%）, with some contribution from surrounding provinces （e.g., Shandong） via regional transport. The two methods also agree on the priority of local emission controls： both identify industrial, residential, and agricultural emissions as the top three categories that should be controlled locally. In addition, the effect of control- ling agricultural ammonia emissions is approximately doubled when the co-benefits of reducing nitrate are considered. The synthesis of SA and SS for addressing specific categories of emissions provides a quantitative basis for the development of emission control strategies and policies for controlling PM2.5 in China.

关键词： PM2.5 exposureSource apportionmentSource sensitivitycontrol priorityChina

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A Multi-Objective Model with Probability Constraints of Trans-Provincial Hydropower Consumption Considering Dynamic Stability Limit

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IOP Conference Series: Materials Science and Engineering 2019年第1期692卷

作者： Ke Yang Rui Mao Xu Wen Chuncheng Gao Miao Huang Wei Yan Southwest Subsection of State Grid Chengdu China State Key Laboratory of Power Transmission Equipment & System Security and New Technology(Chongqing University) Chongqing China College of Automation Chongqing University of Posts and Telecommunications Chongqing China Beijing Ke Dong Electric Power Control System Co. Ltd.Beijing China Nari Group Corporation/State Grid Electric Power Research Institute Nanjing China

With the rapid development of clean energy and serious delay of grid construction, water abandonment is becoming more and more severe. Under this condition, this paper proposed a multi-objective model with probability constraints of trans-provincial hydropower consumption considering dynamic stability limit. Firstly, a mathematical expression about the dynamic stability limit of trans-provincial channel is constructed. Secondly, a risk assessment index of abandoned water is established on the basis of semi-absolute deviation. Then, based on the framework of stochastic programming, a multi-objective model with probability constraints is proposed for hydropower transmission in trans-provincial trade. By means of genetic algorithm with embedded Monte-Carlo simulation technology, the model can be solved efficiently. Finally, data of Tibet power grid is calculated to verify the validity and universality of the research. The results show that the established model can achieve optimal economic benefit between grid companies and generation enterprises, and also effective management of water abandonment risk.

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A novel location method for distribution hybrid lines

A novel location method for distribution hybrid lines

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

作者： Teng, Jun Zhan, Xin Xie, Liwei Zeng, Xiangjun Liu, Yixuan Huang, Long Yangzhou Power Supply Company State Grid Jiangsu Electric Power Corporation Yangzhou Jiangsu Province China Hunan Province Higher Education Key Laboratory of Power System Safety Operation and Control Changsha University of Science and Technology Changsha Hunan Province410004 China

ISBN: (纸本)9781538614273

To solve effects of time synchronization problems in double-ended traveling wave location method and achieve exact identification of reflected wave crests in single-ended traveling wave location method, a novel location method is proposed in this paper. A preliminary fault location and approximate values of fault distance are calculated by double-ended principle firstly. Then fault point reflected waves' arrival time at both sides are calculated via using approximate values. Compared with theoretical time, a time error matrix is built and the value which is closest to zero is identified as the actual arrival time of fault point reflected wave. Finally, accurate location is accomplished based on the single-ended traveling wave principle. EMTP-ATP simulation results show that the proposed fault location method is feasible in hybrid lines and fault location accuracy is improved obviously. © 2017 IEEE.

关键词： Location

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