检索结果-内蒙古大学图书馆

Short-Term Reliability Evaluation of transmission System Using Lightning Strike Probability Prediction

Journal of power and Energy Engineering 2014年第4期2卷 647-655页

作者： Jian Wang Qing Yang Xiaofu Xiong Shijie Weng Yunnan Power Grid Corporation Kunming China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China

The transmission lines are exposed to the atmosphere nature and will be affected by adverse weather such as lightning storm, so that it will affect the reliability of transmission system. This paper studies the fault probability model of transmission line during the lightning storm, and evaluates the short-term reliability of transmission system in the forecasting weather condition. Firstly, build the lightning strike fault probability model of the transmission line based on historical lightning record information, then calculate the lightning strike probability under the forecasting weather conditions, furthermore evaluate the reliability index of transmission system. Utilizing IEEE RTS-79 system to verify the validity of the proposed model and the results show that lightning has great negative influence on the transmission lines and the reliability of transmission system. The reliability evaluation model proposed in this paper can guide the short-term operation and online scheduling for transmission system operators.

关键词： Lightning transmission Line Reliability Evaluation Information Diffusion

来源：评论

学校读者我要写书评

暂无评论

Short-Term Reliability Evaluation of transmission System Using Lightning Strike Probability Prediction

Short-Term Reliability Evaluation of Transmission System Usi...

引用

第六届亚太电力与能源国际学术会议

作者： Qing Yang Xiaofu Xiong Jian Wang Shijie Weng Yunnan Power Grid Corporation State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University

关键词： Lightning transmission Line Reliability Evaluation Information Diffusion

来源：评论

学校读者我要写书评

暂无评论

Short-Term Reliability Evaluation of transmission System under Strong Wind and Rain

Short-Term Reliability Evaluation of Transmission System und...

引用

第六届亚太电力与能源国际学术会议

作者： Qing Yang Xiaofu Xiong Yanan Wei Jian Wang Shijie Weng Yunnan Power Grid Corporation State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University

The impact of strong wind and rain loads will adversely affect the reliability of the overhead lines, it's necessary to study changes in risk of transmission system and establish the reliability model of overhead lines through the strong wind and rain loads. In this article, the stochastic properties of overhead lines' strength and loads were used, according to principles of structural reliability, time-dependent failure probability model of overhead lines was established under the impact of strong wind and rain loads. Simulation of the IEEE-79 system demonstrates that failure probability model is effective. This simulation result also shows that the impact of strong wind and rain loads will seriously affect reliability indices of system loads, rain loads cannot be ignored under strong wind and rain loads.

关键词： Strong Wind and Rain Loads transmission Line Structural Reliability Reliability Modeling

来源：评论

学校读者我要写书评

暂无评论

Research on comprehensive assessment index system for transmission network planningalternatives

Research on comprehensive assessment index system for transm...

引用

3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Lin, Yong Li, Zuo Hong Dong, Mei Ling You, Da Hai Wang, Gang Chen, Wei Hua Guangdong Power Grid Development Research Institute Co. Ltd Guangzhou 510000 Guangdong Prince China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei Province China

ISBN: (纸本)9783038351368

In view of the lack of comprehensive and quantitative evaluation means for transmission network planning currently, a comprehensive assessment index system adapted to the characteristics of the transmission network planning is proposed, including6 strategic layer indices(safety and reliability, economic efficiency, flexibility and coordination, smart and green, controllable risk and social benefits), 16 target layer indices and 57 operating layer *** the assessment standard for each indexis determined to provide objective, comprehensive and systematic evaluation of transmission network planning alternatives as well as prepare for realization of the comprehensive evaluation of transmission network planning. © (2014) Trans Tech Publications, Switzerland.

关键词： Risk assessment

来源：评论

学校读者我要写书评

暂无评论

Analysis of operation characteristics of EHV transmission lines

引用

International Journal of power and Energy Systems 2014年第1期34卷 35-39页

作者： Lin, Li Zhu, Jizhong Zhou, Niancheng Wang, Kaipei State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University China SEPRI China Southern Power Grid Guangzhou China

One of the typical operation modes of the extra-high voltage (EHV) long transmission line is that the power factor at its receiving end is constant. Since the analytical formula of EHV long ransmission line is complex, it is difficult to get its operation characteristic. This paper proposes a circle diagram method to analyze the operation characteristics of EHV long transmission line with the constant power factor at its receiving end. The method includes how to plot the circle diagram. It is used to analyze the power- voltage characteristics of the receiving end of EHV long distance transmission line and calculate the parameters of the limiting transmission points. The proposed method is proved to be intuitive and clear.

关键词： Electric lines

来源：评论

学校读者我要写书评

暂无评论

DC-DC modular multilevel converter with high frequency transformer for transportation applications

DC-DC modular multilevel converter with high frequency trans...

引用

IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific)

作者： Yuqing Cui Yu Chen Yingzhuo Chen Yong Kang Xiaoguang Wei Xinying Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (HUST) Wuhan China State Grid Smart Grid Research Institute Beijing China

This paper proposes the design considerations of a high-voltage-high-power dc-dc modular multilevel converter (MMC), which is consist of the half-bridge submodules and an isolation transformer. To adapt the power density requirements of the transportation applications, a modulation method with low switching frequency for submodules but high-frequency ac voltage for transformer is proposed, aiming to reduce the size of the transformer, the inductors and the dc-capacitors of the submodules. The voltage fluctuation at the dc-capacitor in such a modulation is also estimated. Finally, a design example with 10kV to 20kV voltage and 1MW rating power is given. The analysis and simulation results are matched, which shows the validity of the analysis.

关键词： Modulation Reactive power Optimization Voltage control Capacitors Harmonic analysis Switching frequency

来源：评论

学校读者我要写书评

暂无评论

Research of Lighting Trip-out rate Model of transmission Line

Research of Lighting Trip-out rate Model of Transmission Lin...

引用

2014 International Conference on power and Energy(ICPE 2014)

作者： Shi-yang Zhu Le Wang Can Wang Guangxi Power Grid Electric Power Research Institute State Key Laboratory of Power Transmission Equipment& System Security and New Technology Chongqing University

Failure rate of transmission line and reliability of power system are significantly affected by Lightning meteorological factor. In view of the complexity and variability of Lightning meteorological factors, this paper presents lightning trip-out rate model of transmission line in considering distribution of ground flash density and lightning day hours. Meanwhile, presents a failure rate model of transmission line in different condition, and a risk analysis method for transmission line considering multiple risk factors based on risk quantification. This method takes Lightning meteorological factor as the main evaluation standard, and establishes risk degree evaluation system for transmission line including another five evaluation standard. We put forward the risk indicators by quantifying the risk factors based on experience date of transmission line in service. Based on the risk indexes comprehensive evaluation is conducted, and the evaluation result closer to practice is achieved, providing basis for transmission line risk warning and maintenance strategy.

关键词： Research of Lighting Trip-out rate Model of transmission Line Model

来源：评论

学校读者我要写书评

暂无评论

A Design of WSN and EPON Applied in Online Monitoring for transmission Line

A Design of WSN and EPON Applied in Online Monitoring for Tr...

引用

2014 4th International Conference on Materials,Mechatronics and Automation(ICMMA 2014)

作者： Xu Chen Zhe Du Xianggen Yin Pan Wei Liqiang Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Electric Power Research Institute of Hunan Power Grid Corporation

Natural disasters like icing have a strong impact on the power transmission line which is the foundation of safety and stability operation for power system. In this paper, an online transmission line monitoring and patrol system based on Wireless Sensor Network(WSN) and Ethernet Passive Network(EPON) is firstly designed and a model is built to analyze the latency influenced by the number of towers using EPON communication technology which is solved by Lingo 11.

关键词： Monitoring system Overhead transmission line Wireless sensor network Optical fiber composite overhead ground wire Zigbee

来源：评论

学校读者我要写书评

暂无评论

Preparation of steel fiber/graphite conductive concrete for grounding in substation

Preparation of steel fiber/graphite conductive concrete for ...

引用

International Conference on High Voltage Engineering and Application, ICHVE

作者： De Zhang Huan Le Xinzhu Yan Tao Yuan Jian Li State Grid Nanchong Electric Power Company Nanchong Sichuan China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781479966141

In high soil resistivity regions, values of grounding resistance of substations are usually difficult to meet the requirements of working earthing and safety earthing. The common methods for reducing the grounding resistance are not practical. In order to solve this problem, a steel fiber/graphite conductive concrete is developed in this paper. Steel fiber and graphite are added as conductive fillers. Orthogonal experimental design is applied to formulation optimization. The resistivity, compressive strength and flexural strength of steel fiber/graphite conductive concrete are measured for obtaining the optimal formula. The results demonstrate that the steel fiber/graphite conductive concrete not only has the advantage of small resistivity, but also has excellent mechanical property and good material dispersion effect.

关键词： Optical fiber dispersion Optical fiber networks Steel Concrete Grounding Graphite Conductivity

来源：评论

学校读者我要写书评

暂无评论

Research for the fast distance protection of transmission lines based on equal transfer processes

Research for the fast distance protection of transmission li...

引用

China International Conference on Electricity Distribution, CICED

作者： He He Shaneng Xu Minghao Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Quanzhou Power Supply Company of State Grid Quanzhou China

Taking into account the error caused by differential, two factors' impact on the distance protection algorithm after equal transfer processes are studied, including the sampling rate and cut-off frequency of the low-pass filter. It comes to a conclusion that increasing the sampling rate can reduce the error caused by differential and cutting down the cut-off frequency can reduce the variance of the least square method, which is verified by the ATP simulation and dynamic physical simulation results. Combined with the simulation results, the impact caused by the length of data window is studied by analyzing the performances of the proposed algorithm. By optimizing the sampling rate, the cutoff frequency, and the length of data window, the distance measuring error can be achieved within 5% at approximately 10ms after the fault occurrence.

关键词： Abstracts Equations Cutoff frequency

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：