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Transmission network planning considering line maintenance plan with new energy resources integration

IOP Conference Series: Materials Science and Engineering 2020年第6期768卷

作者： Xueliang Li Donglei Sun Zhixin Wang Hao Xu Mingqiang Wang State Grid Shandong Economic and Technology Research Institute China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan 250061 China

In this paper, a stochastic optimization model of transmission network planning considering annual planned maintenance of lines under new energy integration is proposed. This model combines the planning model and maintenance model together, and can determine the optimal transmission capacity of lines and the annual maintenance plan simultaneously. In addition, in order to take into account the uncertainty of wind power output, the multi-scenario probabilistic method is used, and the nonlinear constraints in the model is equivalently linearized, therefore the model can be converted into a mixed integer linear model and can be directly solved by the commercial solver. To validate its effectiveness and superiority, the proposed stochastic optimization model is tested on the IEEE RTS-24 system.

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Anthropogenic emission inventories in China:a review

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National Science Review 2017年第6期4卷 834-866页

作者： Meng Li Huan Liu Guannan Geng Chaopeng Hong Fei Liu Yu Song Dan Tong Bo Zheng Hongyang Cui Hanyang Man Qiang Zhang Kebin He Ministry of Education Key Laboratory for Earth System Modeling Department for Earth System Science Tsinghua University now at Max-Planck Institute for Chemistry State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University StateKey Joint Laboratory of Environmental Simulation and Pollution Control Department of Environmental SciencePeking University

The development of reliable anthropogenic emission inventories is essential for both understanding the sources of air pollution and designing effective air-pollution-control measures in China. However, it is challenging to quantify emissions in China accurately, given the variety of contributing sources, the complexity of the technology mix and the lack of reliable measurements. Over the last two decades,tremendous efforts have been made to improve the accuracy of emission inventories, and significant improvements have been realized. More reliable statistics and survey-based data have been used to reduce the uncertainties in activity rates and technology distributions. Local emission factors and source profiles covering various sources have been measured and reported. Based on these local databases, improved emission inventory models have been developed for power plants, large industrial plants and the residential,transportation and agricultural sectors. In this paper, we review the progress that has been made in developing inventories of anthropogenic emissions in China. We first highlight the major updates that have been made to emission inventory models and the underlying data by source category. We then summarize the sector-based estimates of emissions of different species contained in current inventories. The progress that has been made in the development of model-ready emissions is also presented. Finally, we suggest future directions for further improving the accuracy of emission inventories in China.

关键词： emission inventory atmospheric chemistry China chemical transport model air pollution

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Distributed Energy Storage Optimization Configuration of Active Distribution Network

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IOP Conference Series: Materials Science and Engineering 2020年第1期729卷

作者： Jiang Zhe Wang Liang Huang Xuxiang Han Xueshan Yang Dong Zhou Ning State Grid Shandong Electric Power Research Institute Jinan 250003 China State Grid Shandong Electric Power Company Jinan 250001 China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan China

With the high proportion of renewable energy access to the distribution network, the volatility and randomness of renewable energy output will have a serious impact on the distribution network, especially at the peak of renewable power output, the reverse trend phenomenon is obvious. The active distribution network displays the 'power' characteristics externally, which makes the voltage problem and transmission congestion problem in the distribution network very serious. This paper establishes a distributed energy storage optimization configuration model that takes into account the voltage quality, and considers the energy storage operation strategy optimization in the energy storage site selection and volume model, which makes the energy storage configuration more reasonable, improves the voltage quality and enhances the renewable energy consumption capacity, improve the economics of system operation.

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Workload-Aware Scheduling for Data Analytics upon Heterogeneous Storage

Workload-Aware Scheduling for Data Analytics upon Heterogene...

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IEEE International Conference on Big Data and Cloud Computing (BdCloud)

作者： Zhuzhong Qian Yuan Gao Mingtao Ji Hui Peng Peng Chen Yibo Jin Sanglu Lu State Key Laboratory for Novel Software Technology Nanjing University Nanjing China NARI Research Institute NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing System R&D Center NARI Technology Co. Ltd. Nanjing State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing

ISBN: (数字)9781728143286

ISBN: (纸本)9781728143293

A trend in nowadays data centers is that equipped with SSD, HDD, etc., heterogeneous storage devices are widely deployed to meet diverse demands of various big data workloads. Since the reading performance of various storage devices are quite different, traditional concurrent data fetching easily incurs unbalanced use among devices. As a result, the straggler in terms of the data fetching, derived from the unbalanced use, directly increases the overall latency of data analytics. To avoid such unbalanced use on fetching large volume of data concurrently from storage devices, we formulate Workload-Aware Scheduling problem for Heterogeneous storage devices (WASH), the goal of which is to minimize the maximum data fetching time for parallel data analytical tasks. We design a randomized algorithm (rWASH) to select a proper source device for each task based on delicate calculated probabilities, which can be proved concentrated on its optimum with high probability. Extensive experiments show that rWASH reduces the average data fetching time for tasks by up to 55% over the state-of-the-art algorithms.

关键词： Task analysis Performance evaluation Data analysis Scheduling Data centers Probability Hardware

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control of Nonlinear Constrained Ultra-Supercritical Boiler–Turbine Units Using Offset-Free Output-Feedback Stable MPC

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IFAC-PapersOnLine 2018年第28期51卷 155-160页

作者： Chen, Chen Pan, Lei Shen, Jiong Lee, Kwang Y. Zhang, Fan Sun, Li Wu, Xiao Zhang, Junli Xue, Wenchao Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast University Nanjing210096 China Department of Electrical and Computer Engineering Baylor University One Bear Place #97356 WacoTX76798-7356 United States State Key Lab of Power System Department of Energy and Power Engineering Tsinghua University Beijing100084 China Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing China

It is extremely challenging to control ultra-supercritical boiler–turbine unit on account of its nonlinearity, coupling among multi-variables, hard input constraints, and unknown disturbances. An offset-free output-feedback stable model predictive control (MPC) (OFOF-SMPC) for nonlinear constrained ultra-supercritical boiler-turbine units is investigated. It is shown that the OFOF-SMPC is composed of a disturbance and state observer, a steady-state target calculator as well as a stable MPC, which can remove unknown disturbances from output channels and ensure the stability of the closed-loop system with input constraints. simulation results demonstrate the effectiveness of the proposed algorithm. © 2018

关键词： Feedback

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Offline Inductance Identification of PMSM using High Frequency Current Signal Injection

Offline Inductance Identification of PMSM using High Frequen...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Tao Liu Changkai Wang YuSheng Hu Ziqiang Ye Chengbao Zhong Gerd Griepentrog Institute for Power Electronics and Control of Drives Technical University of Darmstadt Darmstadt Germany Equipment Dynamics Institute Gree Electric Appliances Zhuhai China State Key Laboratory of Airconditioning Equipment and System Energy Conservation Gree Electric Appliances Zhuhai China

ISBN: (纸本)9781728133997

Accurate knowledge of inductances are essential for successfully achieving high performance of a PMSM and applying sensorless control. This paper presents a novel method for offline measuring the differential and static inductances of a PMSM. For this purpose, a high frequency current signal is injected in the d- and q-axis, respectively. As a result, inductances at different current operating points can be obtained. Experimental results demonstrate the effectiveness of the proposed method.

关键词： Inductance Voltage measurement Delays Mathematical model Voltage control Couplings

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Statistical characteristics of transient enclosure voltage in ultra-high-voltage gas-insulated switchgear

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Plasma Science and Technology 2017年第6期19卷 74-81页

作者： Yuanji CAI Yonggang GUAN Weidong LIU State Key Lab of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing 100084 People＇s Republic of China

Transient enclosure voltage（TEV）,which is a phenomenon induced by the inner dielectric breakdown of SF_6 during disconnector operations in a gas-insulated switchgear（GIS）,may cause issues relating to shock hazard and electromagnetic interference to secondary *** is a critical factor regarding the electromagnetic compatibility of ultra-high-voltage（UHV）*** this paper,the statistical characteristics of TEV at UHV level are collected from field experiments,and are analyzed and compared to those from a repeated strike *** TEV waveforms during disconnector operations are recorded by a self-developed measurement system ***,statistical characteristics,such as the pulse number,duration of pulses,frequency components,magnitude and single pulse duration,are *** transmission line theory is introduced to analyze the TEV and is validated by the experimental ***,the relationship between the TEV and the repeated strike process is *** proves that the pulse voltage of the TEV is proportional to the corresponding breakdown *** results contribute to the definition of the standard testing waveform of the TEV,and can aid the protection of electronic devices in substations by minimizing the threat of this phenomenon.

关键词： transient enclosure voltage （TEV） gas-insulated switchgear （GIS） ultra-high-voltage （UHV） repeated strike process disconnector

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Multiaxial fatigue life prediction of composite materials

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Chinese Journal of Aeronautics 2017年第3期30卷 1012-1020页

作者： Jingmeng WENG Weidong WEN Hongjian ZHANG Jiangsu Province Key Laboratory of Aerospace Power System Nanjing 210016 China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing 210016 China College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

In order to analyze the stress and strain fields in the fibers and the matrix in composite materials,a fiber-scale unit cell model is established and the corresponding periodical boundary conditions are *** matrix cracking as the failure mode of composite materials,an energy-based fatigue damage parameter and a multiaxial fatigue life prediction method are *** method only needs the material properties of the fibers and the matrix to be *** the relationship between the fatigue damage parameter and the fatigue life under any arbitrary test condition is established,the multiaxial fatigue life under any other load condition can be *** proposed method has been verified using two different kinds of load *** is unidirectional laminates subjected to cyclic off-axis loading,and the other is filament wound composites subjected to cyclic tension-torsion *** fatigue lives predicted using the proposed model are in good agreements with the experimental results for both kinds of load forms.

关键词： Fatigue damage parameter Finite element analysis Life prediction Multiaxial fatigue Periodical boundary condition

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An Improved Master-Slave control for Three-port Converter Based Distributed DC Grid-connected PV system 8

An Improved Master-Slave Control for Three-port Converter Ba...

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8th International power Electronics Conference, IPEC-Niigata - ECCE Asia 2018

作者： Jiang, Siyue Sun, Kai Wu, Hongfei Shi, Haixu Dong, Xiaofeng Raza Kazmi, Syed Muhammad State Key Lab of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China Jiangsu Key-Laboratory of New Energy Generation and Power Conversion Nanjing University of Aeronautics and Astronautics Nanjing Jiangsu Province China United States Pakistan Center for Advanced Studies in Energy National University of Sciences and Technology Islamabad Pakistan

ISBN: (纸本)9784886864055

With the development of DC grid technology, it has become a trend to introduce photovoltaic(PV) as a power source to the DC power distribution network. In this paper, an improved master-slave control strategy is proposed to realize power splitting and voltage sharing in a modular system with PV connected. Each module is a three-port converter: Input port connects distributed PV, output port connects to DC grid, and intermediate port is connected in parallel with other modules as a bus to realize the power splitting. For a single module, input voltage, intermediate bus voltage and output voltage should all be controlled to reference but only duty ratio and phase-shifting angel can be regulated hence it may occur the multi-objective variables control problem. While using the proposed strategy, this problem can be solved effectively and the system stability is ensured during the voltage sharing process. This control strategy is verified by simulation and experiment. © 2018 IEEJ Industry Application Society.

关键词： system stability

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Rotation Speed Recovery Strategy Based on Particle Swarm Optimization for Variable power Curve Optimization

Rotation Speed Recovery Strategy Based on Particle Swarm Opt...

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2018 International Conference on Advanced Electronic Materials, Computers and Materials Engineering, AEMCME 2018

作者： Liu, Rui Song, Peng Wang, Xiaosheng Cui, Yang Lin, Zhongwei 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 State Grid Jibei Electric Power Research Institute North China Electric Power Research Institute Co. Ltd. Beijing100045 China Grid-Connected Oper. Technol. for Wind-Solar Storage Hybrid Syst. State Grid Corp. Key Laboratory Beijng100045 China

With the increase of wind power capacity incorporated into the grid, the permeability of wind power increases continuously, which leads to the reduction of the equivalent inertia of the system. Rotor speed recovery will cause the secondary frequency dips when DFIG uses rotor inertial control to participate in system frequency modulation. In order to optimize the secondary frequency dips, this paper uses PSO (Particle Swarm Optimization) to optimize the Parameters of Variable power Functions on the basis of the previously proposed variable power curve strategy. This article simulates this strategy through setting up a system by Simulink. Simulate the results of optimization, compared with the traditional recovery strategy, validity of the proposed strategy is demonstrated through simulation and analysis. © Published under licence by IOP Publishing Ltd.

关键词： Simulink

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