检索结果-内蒙古大学图书馆

The 9th Asia-Pacific power and Energy Engineering Conference (APPEEC 2017)

作者： Gao Yi Songtao Zhang Chao Qin Yuan Zeng Yang Yang Yingying Liu Shengwei Li State Grid Tianjin Power Economics & Technology Research Institute Key Laboratory of Smart Grid of Ministry of Education Tianjin University

This paper presents an auxiliary planning method for intelligent substation access system based on security region. Firstly, the method of resolving the static voltage security region is proposed. Secondly, the method of constructing the optimal index of substation accession is given, which is used to describe the priority of the node into the substation. Finally, a complete set of intelligent substation access system auxiliary planning strategy is given, which takes into account the constraints of the normal operation of the grid on the voltage amplitude.

关键词： Substation the Static Security Region Optimized Index of Substation Accession

来源：评论

学校读者我要写书评

暂无评论

Practical Dynamic Security Region Based on Phase Trajectory

Practical Dynamic Security Region Based on Phase Trajectory

引用

The 9th Asia-Pacific power and Energy Engineering Conference (APPEEC 2017)

作者： Yi Gao Jiangtao Chang Chao Qin Yuan Zeng Yingying Liu Shengwei Li State Grid Tianjin Power Economics & Technology Research Institute Key Laboratory of Smart Grid of Ministry of Education Tianjin University

A fast method based on the phase trajectory to compute DSR is ***, the phase trajectory sensitivity has more linear effect than power angle sensitivity. According to the phase trajectory boundary function, controlling unstable equilibrium generators could be identified. The PDSR is finally obtained by the sensitivity analysis between the phase and generators' active power. Test results on the New England 10-genrator 39-bus system are presented and prove the effectiveness of this approach.

关键词： The Phase Trajectory Sensitivity Analysis Controlling Unstable Equilibrium Mode PDSR

来源：评论

学校读者我要写书评

暂无评论

Study on Ripple Characteristics of Uncontrolled Rectifier Circuit

Study on Ripple Characteristics of Uncontrolled Rectifier Ci...

引用

2017 2nd International Conference on advanced Materials Science and Environment Engineering(AMSEE2017)

作者： Wen-li CHEN Bei HE Ke ZHENG Zhao WU State Grid Chongqing Electric Power Research Institute State Grid Chongqing Electric Power Company State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University

The ripple in DC charging is a basic indicator of the voltage quality, which is related to the filter capacitor and external load. In this paper, the single-phase bridge rectifier circuit is used as the research object. It analyzes the generation process of ripple voltage and derives the expression of ripple voltage. And the effects of filter capacitor C, voltage U and external load R on the ripple coefficient are simulated and analyzed, as well as the spectrum distribution characteristics of the ripple.

关键词： DC charging Ripple voltage Ripple factor Ripple spectrum

来源：评论

学校读者我要写书评

暂无评论

A Synchronization Algorithm for Burst-Mode MR-OFDM System of 802.15.4g

引用

Journal of Physics: Conference Series 2019年第1期1325卷

作者： Yahong Zhao Xu Zhao Yubing Zhang Xiaoke Tang Mingke Dong State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Design and Analysis Technology Co. Ltd Beijing Beijing 100192 China School of Electronics Engineering and Computer Science Peking University Beijing Beijing 100871 China

This paper presents a refined coarse frame synchronization algorithm for long repeated-sequence based preamble STF (short training field) in burst mode MR-OFDM system of 802.15.4g which is of low decision delay and resistant to timing uncertainty due to metric plateau. The precision of coarse timing and frequency offset estimation is improved. A fine symbol timing and frequency offset estimation algorithm based on LTF (long training field) is also proposed which provides an overall solution for the synchronization of burst mode MR-OFDM system. Simulation results are given to provide reference for implementation.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Distance protection operation characteristics analysis of the AC/DC system based on MMC-HVDC interconnection

Distance protection operation characteristics analysis of th...

引用

第二届机电控制技术与交通运输国际学术会议(ICECTT 2017)

作者： Maolin Tang Rui Yu Xi Zhang Chao Xiao Jinxin Ouyang Xiaofu Xiong State Grid Southwest Division State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University

With the attractive advantages of high stability and controUabihty,the MMC-HVDC system has become a key development direction for the *** operation and controllability features of the MMC-HVDC system differ significantly from those of conventional AC and DC *** the grid fault,the MMC-HVDC system exports various short-circuit currents to the AC system,which can be a threat to the correct operation of distance *** the basis of the control principle of the MMC-HVDC converter station,the voltage and phase features of the MMC-HVDC short-circuit current are *** measured impedance variation of the MMC-HVDC distance protection in the AC side is also *** influence and interrelated factors of the MMC-HVDC system to distance protection are *** simulation of PSCAD/EMTDC is done to verify the validity of the analysis.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Research on Parallel Operation Control of Modules Based on Common DC Bus

Research on Parallel Operation Control of Modules Based on C...

引用

China International Electrical and Energy Conference (CIEEC)

作者： Mingqing CHEN Guangyao QIAO Xuan WANG Liang ZHANG Ying ZHANG Bin ZHU Feng DAN State Key Laboratory of Advanced Power Transmission Technology/Global Energy Interconnect Research Institute Co. Ltd. Beijing China China EPRI Science & Technology Co. Ltd. Beijing China National Active Distribution Network Technology Research Center(NANTEC) Beijing Jiaotong University Beijing China State Grid Chongqing Electric Power Research Institute Chongqing China Electricity Affair Engineering Company of China Rarway NO.8 Engineering Group Co. Ltd. Sichuan China

ISBN: (纸本)9781538653937

Electric vehicles are the new energy vehicles with the least exhaust emissions. Therefore, the development of electric vehicles has been valued by many countries. The charging station is the energy supply center for electric vehicles. Whether the charging station is built well determines the degree of popularization of electric vehicles. This paper studied the parallel operation control of modules which are based on the common DC bus in charging station. In the vehicle-to-grid (V2G) mode, when the output sides of the rectifier modules are connected in parallel, all DC/DC charging modules will supply power to the DC bus. Whether the modules can achieve current-sharing is a key factor that affects the reliable operation of the system. The I/U droop control is utilized to achieve current-sharing of all the parallel modules. Consequently, the complicated and less reliable high-speed communication can be eliminated, which improved the system reliability greatly. Simulation in MATLAB verified the feasibility of the strategy.

关键词： Topology Vehicle-to-grid Charging stations Batteries Voltage control

来源：评论

学校读者我要写书评

暂无评论

Arc separating process experiment study in low voltage circuit breaker 6

Arc separating process experiment study in low voltage circu...

引用

6th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2017

作者： Zhu, Tiansheng Liu, Hongwu Guan, Ruiliang Chen, Huiling State key laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an710049 China Changshu Switchgear Mfg. Co. Ltd. Changshu Switchgear Plant Jiangsu Key Laboratory of Smart Grid Distribution and Utilization Technology Research Changshu215500 China

ISBN: (纸本)9789881532398

Weather the arc is separated by the deion plates or not will determine success or failure of interruption for current-limiting circuit breaker. So it's important to investigate the separating condition of arc by the splitters. In this study the oscillating circuit is used as supply power. For circuit breaker with 250A frame size, different materials and numbers of splitters are tested in short current interrupting process. Experiment results verified the necessary condition of successful arc separating process. While the arc column voltage is higher than total voltage of separated arc, the arc will be possibly separated. With the increase of splitters number the required current is higher while the other parameters are constant. Larger number of splitters means higher corresponding arc voltage, which may more easily cause back strike.

关键词： Electric circuit breakers

来源：评论

学校读者我要写书评

暂无评论

Three-phase Analytical Optimization Algorithm for Sectionalizing Switch Placement of a Medium Voltage Overhead Line

Three-phase Analytical Optimization Algorithm for Sectionali...

引用

2017 2nd International Seminar on Applied Physics,Optoelectronics and Photonics（APOP 2017）

作者： Yi-xi LIAO Xuan LUO Bo JIANG Mitchell WANG State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University State Grid Shanxi Electric Power Company Economic and Technological Research Institute State Grid Shanxi Electric Power Company

In the paper,a new heuristic algorithm is proposed for the sectionalizing switch placement of medium voltage overhead lines whose switches are of the same *** objective function includes the reliability indexes of system average interruption duration(SAIDI) and expected energy not supplied(EENS).The constraints involve the maximum available investment,user reliability requirement and maximum sectionalizing switch number,etc.A general maximum product criterion of benefitted load and isolated line length,is presented to locate a single switch,and a three-phase analytical optimization algorithm is proposed for the sectionalizing switch placement of a medium voltage overhead line.A case study shows the effectiveness and practicability of the proposed analytical model and algorithm.

关键词： Three-phase Analytical Optimization Algorithm for Sectionalizing Switch Placement of a Medium Voltage Overhead Line

来源：评论

学校读者我要写书评

暂无评论

Time and Space Distribution Prediction of Electric Vehicle Charging Load Based on Statistical Analysis

Time and Space Distribution Prediction of Electric Vehicle C...

引用

2017 2nd International Conference on Computer, Mechatronics and Electronic Engineering(CMEE 2017)

作者： Long-chang DONG Min-you CHEN Jun-jie LI Ying-xiang WANG State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University State Grid Chongqing Electric Power Research Institute

The electric vehicle charging load forecasting is influenced by many factors and full of randomness and complexity based on the charging operation history data and according to the different types of charging power of different charging behavior, we propose Monte Carlo simulation calculation method which extracts the initial state of charge and the start time of charging. The behavior of different charging methods and different vehicles are classified according to the charging requirements, we selected the starting time and duration of charging as the key factors affecting the charging load time distribution, combined with the statistical analysis of users' charging behavior, to establish the charging load time distribution model. On this basis, we divided the charging load areas to establish the time and space distribution model of charging load. Through the examples analysis,we predicted the temporal and spatial distribution of the load level of the electric vehicle in Chongqing. The analysis results show that with the development of electric vehicle in Chongqing, the charging load will have great influence on the operation and planning of power grid. The charging load has obvious peak to valley difference, and the potential of load regulation is great.

关键词： Electric vehicle Statistical analysis Monte Carlo simulation Temporal and spatial distribution

来源：评论

学校读者我要写书评

暂无评论

Research on erosion rate of contacts for MCCB in short circuit conditions 6

Research on erosion rate of contacts for MCCB in short circu...

引用

6th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2017

作者： Yin, Nairui Liu, Hongwu Guan, Ruiliang Xie, Xinyi State key laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an71004 China Changshu Switchgear Mfg. Co. Ltd. Changshu Switchgear Plant Jiangsu Key Laboratory of Smart Grid Distribution and Utilization Technology Research Changshu215500 China

ISBN: (纸本)9789881532398

In this study the oscillating circuit is set up as power supply. With different circuit parameters a certain type of MCCB is tested to simulate short circuit breaking process. By using split electrode method, the current flowing through the static contact is measured in interrupting process. 3-D scanning technology is used to achieve the morphology and erosion volume of contacts after several times of short current interruption. According to experiment results, time integral of the current flowing through the static contact is proportional to erosion volume of static contact. Erosion volume of moving contact increases with higher time integral of the arcing current. Because distribution of arc root on the surfaces of moving contact and nearby conductor is affected by magnitude of short current, erosion volume of moving contact and time integral of the arcing current aren't linear relations. According to above conclusions, it's very important to improve mobility of arc root on the surface of static contact for decreasing contact erosion in short circuit breaking process.

关键词： Erosion

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：