检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Chi, Yingtian Li, Peiyang Lin, Jin Mu, Shujun Song, Yonghua State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100087 China Tsinghua-Sichuan Energy Internet Research Institute Chengdu610213 China National Institute of Clean-and-Low-Carbon Energy Changping District Beijing102211 China State Key Laboratory of Internet of Things for Smart City University of Macau 999078 China

A fast heating-up rate generally conflicts with the temperature homogeneity of solid oxide cell (SOC) stacks. This study designs an adaptive model predictive controller (MPC) to regulate the heating-up process of SOC stacks. The controller solves an optimization problem in real time to obtain optimal control that shortens the heating-up time by fully using the safety limit. The controller is verified with a three-dimensional (3D) hotbox-stack model calibrated with experiments. 3D model-in-the-loop (MiL) simulations show that the controller is effective under two heating modes despite of model deviations. Under the electrical heating mode, the controller achieves a 33% acceleration compared with a reference control strategy. Comparisons of electrical and gas heating reveal that the former is 63% faster but the latter consumes 41.6% less energy if the waste heat is fully recovered. The hotbox heat capacity is a major limiting factor for the heating-up process, particularly under the gas heating mode. An 80% reduction in the hotbox heat capacity, which can be achieved by reducing the thickness of the insulation layer, improves the heating-up time and the net energy consumption by 69% and 65% under the gas heating mode, respectively. © 2022, The Authors. All rights reserved.

关键词： Model predictive control

来源：评论

学校读者我要写书评

暂无评论

A DC-link Voltage control Scheme for Single-phase Grid-connected PV Inverters

A DC-link Voltage Control Scheme for Single-phase Grid-conne...

引用

2011 IEEE Energy Conversion Congress and Exposition (ECCE 2011)

作者： Fanbo He Zhengming Zhao Liqiang Yuan Sizhao Lu State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (纸本)9781457705427;9781457705410

A fast DC-link voltage controller is desirable to reduce the DC-link capacitor for PV inverters. This paper proposes a method for single-phase grid-connected PV inverters to remove the ripple component from the DC-link voltage signal and a scheme to regulate the DC-link voltage based on energy-balance analysis. The proposed scheme provides excellent dynamic performance as well as a function to prevent DC-link overvoltage by limiting the input power, which is verified by both simulation and experiments.

关键词： DC link Polydnaviridae dc-link capacitor Inventors Voltage regulators dynamic characteristics DC link voltage Scheme Voltage regulation link voltage

来源：评论

学校读者我要写书评

暂无评论

Maximum production point tracking of a high-temperature power-to-gas system: A dynamic-model-based study

arXiv

引用

arXiv 2018年

作者： Xing, Xuetao Lin, Jin Song, Yonghua Hu, Qiang State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100084 China Department of Electrical and Computer Engineering University of Macau China Department of Electrical Engineering Tsinghua University Beijing100084 China Tsinghua-Sichuan Energy Internet Research Institute Chengdu610213 China

power-to-gas (P2G) can be employed to balance renewable generation because of its feasibility to operate at fluctuating loading power. The fluctuating operation of low-temperature P2G loads can be achieved by controlling the electrolysis current alone. However, this method does not apply to high-temperature P2G (HT-P2G) technology with auxiliary parameters such as temperature and feed rates: Such parameters need simultaneous coordination with current due to their great impact on conversion efficiency. To improve the system performance of HT-P2G while tracking the dynamic power input, this paper proposes a maximum production point tracking (MPPT) strategy and coordinates the current, temperature and feed rates together. In addition, a comprehensive dynamic model of an HTP2G plant is established to test the performance of the proposed MPPT strategy, which is absent in previous studies that focused on steady states. The case study suggests that the MPPT operation responds to the external load command rapidly even though the internal transition and stabilization cost a few minutes. Moreover, the conversion efficiency and available loading capacity are both improved, which is definitely beneficial in the long run. Copyright © 2018, The Authors. All rights reserved.

关键词： Dynamic models

来源：评论

学校读者我要写书评

暂无评论

A control Strategy of the Grid Support for Photovoltaic Inverter Based on control-hardware-in-the-loop simulation

A Control Strategy of the Grid Support for Photovoltaic Inve...

引用

International Conference on Advanced power System Automation and Protection (APAP)

作者： Shuang LI Gangquan SI Kai QU Zeyu YANG Guoqing HE School of Electrical Engineering Xi'an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Xi’an China China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China

ISBN: (数字)9781728117225

ISBN: (纸本)9781728117232

With the increasing proportion of renewable energy generation, the grid lost strong electrical support for renewable energy generating units, which leads to a series of new grid- connected stability problems. Therefore, it is of great significance to enhance the acceptance of PV power generation by improving the grid-connected voltage quality of PV inverters. A coordinated control strategy for PV inverters with the grid support capability was proposed in this paper, which fully utilized the voltage and frequency regulation capability of grid- connected inverters. At the same time, a real-time simulation system of PV grid-connected inverter based on FPGA simulator and eHS modeling technology was built by RT-LAB simulation platform. Finally, some relevant experiments are carried out on the simulation platform when the grid-connected voltage is disturbed. And the simulation results verified the validity of the proposed control strategy.

关键词： Inverters Voltage control Reactive power power generation Frequency control power system stability Threshold voltage

来源：评论

学校读者我要写书评

暂无评论

Experimental analysis of DC pre-excitation for 3-level inverter-motor system

引用

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2006年第3期26卷 159-163页

作者： Bai, Hua Zhao, Zheng-Ming Hu, Xian Chen, Xin State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing 100084 China South Automation Company Nanjing 210003 China

In the AC adjusting speed system, the significant current impulse frequently occurs in the starting process while the output torque is sufficient. This would damage the power electronics device, cause the unbalance of neutral point in three-level NPC topology, and deteriorate the starting performance. In this paper, a DC pre-excitation strategy, which limits the starting current and enhances the electromagnetic torque via establishing the flux linkage before starting process, is proposed to the three-level inverter under analysis on the mechanism of the above large current. The relevant experiments present its eminent effect on the 380 V/160 kW inverter-motor system. Also this paper discuss the feasibility of its application in high voltage high power inverter.

关键词： Induction motors

来源：评论

学校读者我要写书评

暂无评论

Effect of Vinyl Content on Mechanical Property and Electrical Tree Initiation in Silicone Rubber

Effect of Vinyl Content on Mechanical Property and Electrica...

引用

China International Electrical and Energy Conference (CIEEC)

作者： Jiangyuan SUI Ling ZHANG Yuanxiang ZHOU Xinyan ZHANG Zixia CHENG Shaowei GUO School of Electrical Engineering Xinjiang University Urumqi China State Key Lab of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China School of Electrical Engineering Zhengzhou University Zhengzhou China Electric Power Research Institute State Grid Jibei Electric Power Company Beijing China

ISBN: (纸本)9781538653937

The vinyl content in methyl vinyl silicone oil has a significant impact on the mechanical and electrical properties of reinforced silicone rubber. In this study, mechanical property and electrical tree initiation of silicone rubber were studied by comparing different vinyl contents. The results show that shore hardness, tensile strength, elongation at break, and tear strength of insulating silicone rubber material increase first and then decrease with the of vinyl content increasing from 1% to 5%. The breakdown strength and the initiation voltage of electrical tree are basically consistent with the variation of tensile strength and tear strength. Detailed discussion are presented. This work could provide data support for the practical preparation of engineering silicone rubber.

关键词： Rubber Mechanical factors Oils Electric breakdown Aging Needles

来源：评论

学校读者我要写书评

暂无评论

Identification of inactive constraints for SCED model considering uncertain power injection

引用

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2014年第34期34卷 6050-6057页

作者： Ding, Tao Bo, Rui Guo, Qinglai Sun, Hongbin Huang, Can Li, Fangxing State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing100084 China Midwest ISO St. Paul MN55108 United States Department of Electrical Engineering and Computer Science The University of Tennessee Knoxville TN37996 United States

With the constant expansion of power grid, a large number of security constraints have put tremendous challenges to the online economic dispatch. An efficient tool to eliminate the inactive constraints becomes necessary for security constraints economic dispatch (SCED) in large power systems. In this paper, considering the uncertainty of renewable energy integration, a fast and effective method to identify the inactive security constraints was proposed. Firstly, the definition of uncertain inactive security constraints and a necessary and sufficient condition to identify those were presented respectively. Considering the time-consuming identification, we relaxed the feasible region of original SCED model and utilized greedy algorithm to quickly eliminate part of inactive constraints. Then another necessary and sufficient condition was proposed and verified, where the remaining inactive constraints could be identified. Through the simulation of 24-time periods 9-bus system and 96-time periods IEEE 118-bus system, the speed and effectiveness of proposed method were verified. Moreover, the results can help dispatch operators to locate the transmission lines with the highest congestion risk. © 2014 Chin. Soc. for Elec. Eng.

关键词： Scheduling

来源：评论

学校读者我要写书评

暂无评论

Optimal Capacity Allocation of Integrated Agricultural Energy Network with Enhanced Geothermal System Considering Seasonal Differences

Optimal Capacity Allocation of Integrated Agricultural Energ...

引用

IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Yang Si Laijun Chen Xuelin Zhang Xiaotao Chen Handing Dan Shengwei Mei Qinghai Key Lab of Efficient Utilization of Clean Energy(Tus-Institute for Renewable Energy) Qinghai University Xining China Qinghai Xining Power Generation Branch of Huanghe Hydropower Xining China State Key Laboratory of Control and Simulation of Power System and Power Tsinghua University Beijing China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

As an essential direction of agricultural development in the future, the energy demand for facility agriculture varies significantly in different seasons. In this paper, an integrated energy network structure for independent facility agriculture with combined heat and power enhanced geothermal system (CHP-EGS) is proposed. Based on the CHPEGS cogeneration model and stochastic optimization method, the optimal analysis model for capacity allocation of independent facility agricultural integrated energy network is established. Taking the energy supply of facility agriculture in the hot dry rock resource-rich area of the Gonghe basin in China as an example, the optimal allocation scheme and operation characteristics of integrated energy networks for facility agriculture are analyzed considering the difference of seasonal energy consumption. The results show that, under the same capacity configuration, facility agriculture has sufficient energy support in summer, and its income can be increased by expanding the area of greenhouse or developing product processing. In winter, if the basic energy supply-demand of facility agriculture is to be ensured, the emergency heating system should be configured according to about 30% of the maximum heating demand. The optimization model and case analysis can provide meaningful guidance for seasonal energy sources planning of facility agriculture.

关键词： Analytical models Cogeneration Stochastic processes Agriculture Resource management Thermal energy Energy storage

来源：评论

学校读者我要写书评

暂无评论

Adaptive Sliding Mode control of Flexible Load Driven by Motors considering the damping

Adaptive Sliding Mode Control of Flexible Load Driven by Mot...

引用

International Conference on Electrical Machines and systems

作者： Youshuang Ding Xi Xiao State Key Lab of Security Control and Simulation of Power Systems and Large Scale Generation Equipment Department of Electrical Engineering Tsinghua University China

ISBN: (纸本)9781467388634

This paper presents an adaptive sliding mode controller for the system of flexible load driven by motors with the damping and friction considered. The controller comprised the sliding mode controller and the Kalman estimator. Firstly, the parameter uncertainties and disturbance are modeled with a bounded variable and then an integral sliding surface is designed. Then, to relax the requirement for the bound of uncertainties, a Kalman state estimator is proposed to estimate the bound of uncertainties and the unmeasurable states. With the proposed control structure, the vibration caused by the flexibility can be suppressed and besides, the controller is robust to a wide range of parameter uncertainty and disturbance. The performance of the control strategy is verified via simulation and experimental results.

关键词： Flexible joint flexible manipulator sliding mode adaptive Kalman filter

来源：评论

学校读者我要写书评

暂无评论

reversible in-situ exsolution of Fe catalyst in La0.5Sr1.5Fe1.5Mo0.5O6-δ anode for SOFCs 16

reversible in-situ exsolution of Fe catalyst in La0.5Sr1.5Fe...

引用

16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019

作者： Qi, H. Yang, T. Li, W. Ma, L. Hu, S. Shi, W. Sabolsky, E.M. Zondlo, J. Hart, R. Hackett, G.A. Liu, X. Department of Mechanical and Aerospace Engineering West Virginia University MorgantownWV26506 United States National Energy Technology Laboratory MorgantownWV26505 United States Oak Ridge Institute for Science and Education P.O. Box 117 Oak RidgeTN37830 United States Department of Energy and Power Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing10083 China GE Global Research Centre NiskayunaNY12309 United States

ISBN: (纸本)9781607688747

In-situ exsolution is widely considered to be an efficient and cost-effective method to enhance the electrochemical performance of a ceramic anode in solid oxide fuel cells (SOFCs). In this study, by controlling the non-stoichiometry of Sr2Fe1.5Mo0.5O6-δ with A-site doping, evenly distributed Fe nano-particles (~100 nm) were obtained on surface of La0.5Sr1.5Fe1.5Mo0.5O6-δ (LSFM) when treated in hydrogen. In a redox environment, excellent exsolution-dissolution reversibility was also demonstrated. Electrical conductivity relaxation (ECR) and electrochemical impedance spectroscopy (EIS) were employed to evaluate the surface reaction kinetics change during exsolution. The surface exchange coefficient (kex) was increased by 1.5 to 2 times with Fe exsolution. Based on distribution of relaxation time (DRT) analysis, the polarization resistance (Rp) associating with surface process was reduced in the first few hours. Both results revealed an enhanced surface reaction kinetics which mainly benefits from the high catalytic activity of exsolved nano-particles to H2 adsorption and dissociation process. © The Electrochemical Society.

关键词： Electrochemical impedance spectroscopy

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：