检索结果-内蒙古大学图书馆

International Conference on Lightning Protection (ICLP)

作者： Chen-long Liu Qi Shuai Lei Qi Xiang Cui Chao Fang Xiaoguang Wei State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China State Grid Smart Grid Institute China-EPRI Electric Power Engineering Company Limited Beijing China

ISBN: (纸本)9781479935451

As is widely recognized, lightning has always been a threatening factor for power system. Consequently, the protection against lightning must be taken into consideration when new technologies are introduced to the power system. Besides, with the ability to transmit high voltage, large capacity power stably over a long distance, High Voltage Direct Current (HVDC) systems have become an important part of the strong smart grid of China. As the core equipment of HVDC converter station, the thyristor valve will be exposed to different kinds of overvoltage originating in the AC and DC systems. The safety and reliability of the power systems depends on the capacity to withstand overvoltage of thyristor valve on a great extent. In this paper, choosing ±1100 kV DC converter valve tower as the research object, under the overvoltage insulation testing conditions, a simulation model is established, a new kind of analysis algorithm is put forward and authenticated, the over-voltage analysis is accomplished. Based on the detailed physical structure of converter valve, broadband circuit modeling of ±1100 kV thyristor modules and capacitance parameter, an overvoltage analysis model of ±1100 kV DC converter valve tower is established. After that, a new method of converter valve tower overvoltage analysis has been put forward, which could avoid the deficiencies of the existing research methods effectively. On the basis of the previous work, the non-uniform coefficient concept is introduced to analyze overvoltage in valve tower. Through numerous calculations, the voltage distribution characteristics of the key device in the converter valve are gained when the converter valve is exposed to lightning overvoltage and fast front overvoltage. Besides, the quantitative analysis of influencing factors of the voltage distribution non-uniform coefficient is also presented in the paper.

关键词： Three-dimensional displays

来源：评论

学校读者我要写书评

暂无评论

Start-up scheme for HVDC system based on Modular multilevel converter

Start-up scheme for HVDC system based on Modular multilevel ...

引用

2nd IET Renewable power Generation Conference, RPG 2013

作者： Li, Tan Zhao, Chengyong Xu, Jie Cai, Xinhong Pang, Hui Lin, Chang State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Changping District Beijing 102206 China State Grid Smart Grid Research Institute Changping District Beijing 102200 China

ISBN: (纸本)9781849197588

For the advantage of lower harmonic content, the modular design, lower switching frequency and so on, Modular multilevel converter (MMC) has become the development tendency of voltage source converter based HVDC (VSC-HVDC). The working principle of MMC-HVDC is analyzed and the start-up scheme is researched in detail. Based on the "two-stage" start-up scheme, a calculation method of the limiting resistance is proposed, a method to set the rising slope of DC voltage and reference value of reactive power control is proposed. In addition, to realize power transmission, detailed procedures are designed based on the D-Q decoupled control with margin control. A two-terminal active MMCHVDC simulation model in PSCAD/EMTDC is established and the efficiency of the proposed scheme is validated.

关键词： power transmission

来源：评论

学校读者我要写书评

暂无评论

The hybrid HVDC transmission using line Commutated Converter and Full Bridge Modular Multilevel Converter

The hybrid HVDC transmission using line Commutated Converter...

引用

2nd IET Renewable power Generation Conference, RPG 2013

作者： Xu, Jie Zhao, Cheng-Yong Li, Tan Xu, Jian-Zhong Hui, Pang Chang, Lin State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Changing District Beijing 102206 China State Grid Smart Grid Research Institute Changing District Beijing 102200 China

ISBN: (纸本)9781849197588

With its advantages of relatively low cost and mature technology, Line Commutated Converter based HVDC (LCC-HVDC)had been well developed in all around the world. However, its need for absorbing large amounts of reactive power and the risk of commutation failure have limited its further development. Meanwhile, the Full-Bridge Modular Multilevel Converter based HVDC (FBMMC-HVDC) was adopted on account of its flexible operating control characteristic, independent control ability of active power and independent control ability of reactive power, while its relatively high cost has been criticized. Therefore, the paper proposes the New Hybrid High Voltage Direct Voltage (NH-HVDC) system which combines the advantages of the both ones. The proposed NH-HVDC is able to achieve power reversal without the need for the power cut or the high speed switches, which can't be realized in ever proposed H-HVDC. The paper analyzes the mathematical model of NH-HVDC, designs the appropriate control scheme and the operating principles and methods of power reversal for it. Based on the PSCAD/EMTDC, a NH-HVDC model with ±400kV DC voltage is built. The results show that the NH-HVDC system can operate stably and has the ability of power reversal.

关键词： Reactive power

来源：评论

学校读者我要写书评

暂无评论

The study of the tripping of wind farm connection based on VSC-HVDC

The study of the tripping of wind farm connection based on V...

引用

2nd IET Renewable power Generation Conference, RPG 2013

作者： Dou, Haoxiang Zhao, Cheng-Yong Xu, Jie Hui, Pang Chang, Lin State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Changing District Beijing 102206 China State Grid Smart Grid Research Institute Changing District Beijing 102200 China

ISBN: (纸本)9781849197588

With the rapid of wind farm connection into grid, the tripping problem of wind farm becomes more and more prominent. Large wind farm tripping seriously threatens the safe and stable operation of the grid. Voltage source converter based HVDC (VSC-HVDC) has been used for wind farm connection into grid. This paper focuses on the tripping of wind farm connection based on VSC-HVDC. Firstly the paper analyses the typical failure evolution process over spatial and temporal scales. Furthermore, it establishes the mathematical model of the wind farm access VSC-HVDC system and researches tripping of wind farm mechanism and the dominant factor. For different reasons for the tripping of wind farm, based on VSC-HVDC control characteristics, the paper proposes improvement measures.

关键词： Electric power transmission networks

来源：评论

学校读者我要写书评

暂无评论

Resistance Characteristics of Arc in Long Air Gap

引用

高电压技术 2013年第8期39卷 1881-1885页

作者： YU Zhanqing YU Junjie ZENG Rong CHEN He PENG Xiang State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China Maintenance and Test Center of EHV Power Transmission Company China Southem Power Grid Co. Ltd. Guangzhou 510663 China

Arc resistance is an important parameter for characterizing long arcs in air, and its laboratory testing is of importance for accurate arc modeling of electromagnetic transient caused by short circuit fault. Therefore, we constructed an experimental system to study the cha- racteristics of long AC arc in air. Driven by currents of 10 kA or 40 kA (root mean square value), the system produces arcs with different initial lengths of 1 m, 2 m and 4 m, and the movement of the arcs are captured by a high-speed camera. After performing experiments using the system, we carried out analysis and comparisons of the arc resistance of arcs with different lengths and different currents, as well as a study of the relationship between the macro-morphology and the resistance of the arcs. Conclusions were drawn from the experimental re- sults: the arc voltage had obvious saturation characteristics; the arc resistance increased with the increase of arc length and the decrease of current; the arcs bended or extended significantly in time and the peak arc voltage within a single cycle increased correspondingly; the arcs had voltage and current in the same phase. In the end, a formula of arc resistance based on the experiment results is derived.

关键词：耐电弧性电阻特性空气间隙实验室测试电流驱动实验系统初始长度电弧电压

来源：评论

学校读者我要写书评

暂无评论

The hybrid HVDC transmission using Line Commutated Converter and Full Bridge Modular Multilevel Converter

The hybrid HVDC transmission using Line Commutated Converter...

引用

2nd IET Renewable power Generation Conference (RPG 2013)

作者： Jie Xu Cheng-yong Zhao Tan Li Jian-zhong Xu Hui Pang Chang Lin State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Changing District Beijing 102206 China State Grid Smart Grid Research Institute Changing District Beijing 102200 China

关键词：

来源：评论

学校读者我要写书评

暂无评论

Start-up scheme for HVDC system based on modular multilevel converter

Start-up scheme for HVDC system based on modular multilevel ...

引用

2nd IET Renewable power Generation Conference (RPG 2013)

作者： Tan Li Chengyong Zhao Jie Xu Xinhong Cai Hui Pang Chang Lin State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Changping District Beijing 102206 China State Grid Smart Grid Research Institute Changping District Beijing 102200 China

For the advantage of lower harmonic content, the modular design, lower switching frequency and so on, Modular multilevel converter (MMC) has become the development tendency of voltage source converter based HVDC (VSC-HVDC) . The working principle of MMC-HVDC is analyzed and the start-up scheme is researched in detail. Based on the “two-stage” start-up scheme, a calculation method of the limiting resistance is proposed, a method to set the rising slope of DC voltage and reference value of reactive power control is proposed. In addition, to realize power transmission, detailed procedures are designed based on the D-Q decoupled control with margin control. A two-terminal active MMC-HVDC simulation model in PSCAD/EMTDC is established and the efficiency of the proposed scheme is validated.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The study of the Tripping of wind farm connection based on VSC-HVDC

The study of the Tripping of wind farm connection based on V...

引用

2nd IET Renewable power Generation Conference (RPG 2013)

作者： Dou Haoxiang Zhao Cheng-yong Xu Jie Pang Hui Lin Chang State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Changing District Beijing 102206 China State Grid Smart Grid Research Institute Changing District Beijing 102200 China

ISBN: (纸本)9781629936017

With the rapid of wind farm connection into grid, the tripping problem of wind farm becomes more and more prominent. Large wind farm tripping seriously threatens the safe and stable operation of the grid. Voltage source converter based HVDC (VSC-HVDC) has been used for wind farm connection into grid. This paper focuses on the tripping of wind farm connection based on VSC-HVDC. Firstly,the paper analyses the typical failure evolution process over spatial and temporal scales. Furthermore, it establishes the mathematical model of the wind farm access VSC-HVDC system and researches tripping of wind farm mechanism and the dominant factor. For different reasons for the tripping of wind farm, based on VSC-HVDC control characteristics, the paper proposes improvement measures.

关键词： Tripping of wind farm VSC-HVDC Control mode Voltage margin Wind farms Control modes Connections voltage source converter stability operations

来源：评论

学校读者我要写书评

暂无评论

A new battery energy storage system control method based on SOC and variable filter time constant

A new battery energy storage system control method based on ...

引用

2012 IEEE PES Innovative smart grid Technologies, ISGT 2012

作者： Guo, Li Zhang, Ye Wang, Cheng Shan Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

ISBN: (纸本)9781457721588

Because of large fluctuations and strong randomness of active power generated by renewable energy resources, taking into account the constraints such as battery life cycle, a new battery energy storage system control method based on real-time state-of-charge and variable filter time constant is presented. This method could compensate the fluctuation composition of a particular frequency band of power. At the same time, filter time constant is adjusted in order to stabilize the value of SOC in a certain range, and over-charging and over-discharging of the battery is avoided. A photovoltaic (PV) and battery hybrid system modeled by PSCAD is tested to verify the validity of this method. © 2012 IEEE.

关键词： Hybrid systems

来源：评论

学校读者我要写书评

暂无评论

Investigation of bipolar block emergency in UHVDC convertor station caused by lightning stroke

Investigation of bipolar block emergency in UHVDC convertor ...

引用

2012 31st International Conference on Lightning Protection, ICLP 2012

作者： Zhang, Xiao Yu, Zhanqing He, Jinliang Luo, Bin Cai, Hansheng State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China Xipeng Chen Technology Research Centre China Southern Power Grid Co. Ltd Guangzhou Guangdong Province China

ISBN: (纸本)9781467318976

It is noteworthy that bipolar block emergencies of the ±800kV UHVDC system in China happened twice within two years caused by lightning strokes. To recur and investigate the mechanism of such emergencies, lightning transient performance and relative electromagnetic interference (EMI) in the UHVDC system are investigated. Wide-band circuit models of major UHVDC equipments are set for calculation, while the lightning stroke shielding failure process and transmission corona loss are also considered during the simulation. By combining the fault records in the converter station and simulation results , possible ways of EMI into the secondary system produced by primary circuit lightning transient are analyzed. The results would help explain the cause of such bipolar block emergency and provide reference for protection methods of lightning caused EMI in UHVDC system. © 2012 IEEE.

关键词： Lightning

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：