检索结果-内蒙古大学图书馆

2005 IEEE International Conference on Industrial Technology, ICIT 2005

作者： Shutao, Zhao Baoshu, Li Jinsha, Yuan Dongsheng, Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)0780394844

Imitating human's ability of visual and analysis models, a computer vision-based measuring-instrument calibration method is proposed in this paper. Capturing meter images from real-time video with every analog output, via Radial basis function neural network (RBFNN) to classify the dial plate elements, and meter reading can be obtained from complex needle movement. The particle feature extraction, RBFNN simple architecture and fast training process can satisfy the real-time meter reading perfectly in the needle identifier and reading recognition. The least squares fit method based on maximum likelihood estimate is efficient in needle parameter derivation, and the computer vision-based meter calibration method has high performance and accuracy. © 2005 IEEE.

关键词： Computer vision

来源：评论

学校读者我要写书评

暂无评论

Technology of detecting GIC in power grids & its monitoring device

Technology of detecting GIC in power grids & its monitoring ...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Lian-guang, Liu Hao, Zhang Chun-ming, Liu Jian-hui, Guo Qing-xiong, Guo Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing 102206 China Hunan Chenzhou Electric Power Hunan Chenzhou 423000 China

ISBN: (纸本)0780391144

The magnetic storm results in the transmission lines with geomagnetically induced current (GIC). And GIC happening in random has the frequency between 0.001Hz - 0.1Hz, and continues from several minutes to several hours. Based on elaborating mechanism and characteristic of GIC in grids and the influence on china power grids, the article has conducted the research work of GIC monitoring technology, and has investigated the method of sampling data of GIC, the survey algorithm and the new monitoring device. The simulated test shows, the monitoring device can effectively measure GIC which is signal of quasi direct current and randomness, has advantages of having few data to be handled and needing little memory space, etc. © 2005 IEEE.

关键词： Electric power systems

来源：评论

学校读者我要写书评

暂无评论

A novel HVDC transmission system with parallel large capacitor connected in the DC side of the rectifier and its technical feasibility

A novel HVDC transmission system with parallel large capacit...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Zhao, Chengyong Cui, Haibo Li, Gengyin IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Provinece China

ISBN: (纸本)0780391144

In this paper, a novel HVDC transmission system is presented which is with parallel large capacitor connected in the DC side of the rectifier (shorted form HVDC-C). The fundamental principle and technology characteristics of HVDC-C are analyzed. The study shows that HVDC-C reduces the component of harmonic voltage and harmonic current both side in AC system and DC transmission line, makes control strategy more flexible and the filter structure more simple, etc. Furthermore, the control method, contrast to conventional HVDC and application foreground of HVDC-C is discussed briefly. The simulations based on PSCAD/EMTDC show that HVDC-C can operate steadily, has the capability to restore steadily when short circuit fault occurs, and is feasible technically and obvious in advantages. © 2005 IEEE.

关键词： HVDC power transmission

来源：评论

学校读者我要写书评

暂无评论

Study on the influence of TCSC on fault component distance protection

Study on the influence of TCSC on fault component distance p...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Liu, Qing Wang, Zengping Xu, Yan IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding City Heibei Province China

ISBN: (纸本)0780391144

Based on the characteristics of TCSC, the influence of TCSC on fault component distance protection is analyzed. With the new setting resistance to be ZZd-jXc, the action of fault component distance protection on the line equipped with TCSC is presented. It is concluded that the fault component distance protection will not act incorrectly, but the range of protection will be reduced, especially when the TCSC is bypassed. © 2005 IEEE.

关键词： Electric power transmission

来源：评论

学校读者我要写书评

暂无评论

Analysis and control of wind farm incorporated VSC-HVDC in unbalanced conditions

Analysis and control of wind farm incorporated VSC-HVDC in u...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Yin, Ming Li, Gengyin Zhou, Ming Liu, Yong IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)0780391144

With increasing attention to sustainable development and environmental protection, more and more countries turn to wind energy to reduce their dependence on traditional fossil fuel energy. Among the new challenges with this trend is how to integrate wind farm with existing ac network more effectively. The paper presents a possible measure based on VSC-HVDC, namely so-called wind farm incorporated VSC-HVDC (WVSC-HVDC). In the paper the wind farm along with an ac grid supplies to a passive network. The paper firstly introduces VSC-HVDC, and then presents a space vector based control strategy for supplying to a passive network. The rectifier controls dc voltage and reactive power that is needed by the wind farm. The inverter controls the ac bus voltage in the passive network. Simulations using PSCAD/EMTDC are performed to study the steady and transient behaviors of WVSC-HVDC. With harmonics analysis, the simulation results will be helpful for further understanding of the operation characteristics of WVSC-HVDC and its protection design. © 2005 IEEE.

关键词： HVDC power transmission

来源：评论

学校读者我要写书评

暂无评论

Analysis and design of H∞ controller in VSC-HVDC systems

Analysis and design of H∞ controller in VSC-HVDC systems

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Liang, Haifeng Li, Gengyin Li, Guangkai Li, Peng Yin, Ming IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)0780391144

Through the analysis on voltage source converter (VSC) equations in dq0 coordinate system, the state space equation of the generalized plant is gained. By use of H∞ theory, constant DC voltage H∞ controller and constant AC voltage controller are designed. On the basis of establishing MATLAB simulation model for transmitting power to passive network via VSC-HVDC system, the simulation of control modes, such as constant DC voltage control, constant AC voltage control and constant reactive power control, is conducted. Simulation results show that the proposed controller can meet the need of supplying power to passive network and the control modes are effective. © 2005 IEEE.

关键词： Electric converters

来源：评论

学校读者我要写书评

暂无评论

The similitude power detection on single-phase-to-ground fault in the non-solidly grounded system

The similitude power detection on single-phase-to-ground fau...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Zhao, Chengyong Guo, Yanfen Li, Gengyin IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003. Hebei Provinece China

ISBN: (纸本)0780391144

Detecting single-phase-to-ground fault is a difficult and challenging problem in the non-solidly grounded system that includes neutral point ungrounded, neutral point high-resistance grounded and neutral point compensated extinction coil grounded system. It is important to identify the faulted line quickly and exactly to reduce the time and effort necessary to locate and remove the fault, so that the probability of a second ground fault with its destructive currents can be reduced significantly. Based on analyzing the characteristics of the existing methods about identifying the faulted line in the non-solidly grounded system, the characteristics of the lines' zero-sequence current and the system's zero-sequence voltage and the relationship between every line's zero-sequence current and the system's zero-sequence voltage are analyzed deeply and a new method using similitude power to determine the faulted line is presented. The method can be applied to neutral point ungrounded system and neutral point ineffective grounded system to determine the faulted line accurately when resistance ground faults occur. Various ground faults under different conditions are simulated using MATLAB. The results show the method is feasible and effective. © 2005 IEEE.

关键词： Electric fault currents

来源：评论

学校读者我要写书评

暂无评论

Multiagent and WAN based adaptive coordinated protection system

Multiagent and WAN based adaptive coordinated protection sys...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Song, Shaoqun Zhu, Yongli Huang, Min Yu, Hong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding China North China Electric Power University Baoding China

ISBN: (纸本)0780391144

This paper presents a Multi-Agent and WAN Based Adaptive Coordinated protection System (MAWBACPS). The system utilizes IP Intranet to realize real-time wide area information exchange of a power system. Multi-agent system's several good qualities to solve distributing problems are used to realize the coordination of the operation settings of protective relays. A new idea of effortful adaptation for power system protection is proposed, and a new method to determine adaptive coordinated relay settings of lines are proposed in this paper. Moreover, the structure, communication mechanism and coordination control strategy of MAWBACPS, and relating agents' design are presented. Experiment results illustrate that MAWBACPS can realize the coordination of protections, enable the back-up relays to use their adaptive settings in most situations, and efficiently improve the security of power system. © 2005 IEEE.

关键词： Electric power transmission networks

来源：评论

学校读者我要写书评

暂无评论

Project study of dynamic voltage restorer

Project study of dynamic voltage restorer

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Yin, Zhongdong Han, Minxiao Zhou, Lixia Yu, Kunshan Key Laboratory of Power System Protection and Dynamic Securty Monitoring and Control Ministry of Education China Electric Power Research Institute Beijing China

ISBN: (纸本)0780391144

The paper studies a practical project of 2MVA dynamic Voltage Restorer on the basis of transformer-less cascade multilevel topology, it discusses each part working principle of DVR, but also provides a practical voltage sag problem solving scheme for a 6kV feed line based on proposed cascade structure. EMTDC/PSCAD based simulation results verify the validity of proposed scheme. © 2005 IEEE.

关键词： Voltage control

来源：评论

学校读者我要写书评

暂无评论

Real time detection method for any integral harmonic voltage based on instantaneous reactive power theory

引用

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2005年第18期25卷 70-73页

作者： Sun, Cai-Hua Zong, Wei He, Lei Du, Ning Li, Hai-Yan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

In order to implement real time detection of harmonic voltage, a method for any harmonic voltage detection based on instantaneous reactive power theory was presented. In the detection the standard current signals were additional, so the detection precision was not affected by the distorted system current and the detection results could also reflect the changes of frequency shift. To make the dynamic response speed quicker, an algorithm with feedback compensation was presented. The simulation results show that the algorithm can quicken the dynamic response speed effectively, the feedback compensation value also has a bigger effect on the response speed and detection precision, and the detection performance are not affected by frequency shift.

关键词： Signal detection

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：