检索结果-内蒙古大学图书馆

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

作者： Yin, Zhongdong Zhang, Jianhua Xiao, Xiangning Cui, Zhengpai Long, Yunbo Key Laboratory of Power System Protection and Dynamic Securty Monitoring and Control Ministry of Education

ISBN: (纸本)0780391144

This paper puts forward a novel topology of controllable reactor, the structure is based on many small capacity thyristor controlled reactor (TCR) modules and a three-windings transformer connecting to system. The transformer secondary adopts duplex winding structure and each has multi-bank TCR modules being in delta connection. In this topology, the harmonic current injected into the power system is very small. It not only possesses all the functions a traditional TCR has, but also has many other merits such as occupying small floor space, generating little loss, easy implement control and protection scheme, and high reliability etc. A 500kvar industrial prototype is under construction in Langfang, Hebei province of ***. Digital simulation based on EMTDC/PSCAD and field test were carried out to verify the perfect harmonics characteristics of topology proposed. © 2005 IEEE.

关键词： Reactive power

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

Environmental/economic transaction planning using multiobjective particle swarm optimization and non-stationary multi- Stage assignment penalty function

Environmental/economic transaction planning using multiobjec...

引用

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

作者： Ma, Rui Wang, Peng Yang, Huachun Hu, Guoqiang Changsha Science and Technology University Changsha China Key Laboratory of Power System Protection and Dynamic Securty Monitoring and Control Ministry of Education Beijing China

ISBN: (纸本)0780391144

This paper presents a new approach for Environmental/Economic transaction planning model of the electricity market. The Environmental/Economic transaction planning problem is formulated as a multi-objective optimal power flow (MOPF) problem. A novel algorithm using multiobjective Particle Swarm Optimization (MOPSO) and non-stationary multi-stage assignment penalty function is proposed to solve this problem. PSO is modified by using dynamic neighborhood strategy, new particle memory updating, and one-dimension optimization to deal with multiple objectives. Incorporating of non-stationary multi-stage assignment penalty function in solving OPF problem can improve the convergence. The proposed method is demonstrated on the IEEE 30-bus system. The results show that the proposed approach can efficiently gain multiple pareto optimal transaction planning that match with the sustainable development strategy. © 2000 IEEE.

关键词： Strategic planning

来源：评论

学校读者我要写书评

暂无评论

Time series online prediction algorithm based on least squares support vector machine

引用

Journal of Central South University of Technology 2007年第3期14卷 442-446页

作者：吴琼刘文颖杨以涵 Key Laboratory of Power System Protection and Dynamic Security Monitory and Control of Ministry of Education North China Electric Power University

Deficiencies of applying the traditional least squares support vector machine （LS-SVM） to time series online prediction were specified. According to the kernel function matrix＇s property and using the recursive calculation of block matrix, a new time series online prediction algorithm based on improved LS-SVM was proposed. The historical training results were fully utilized and the computing speed of LS-SVM was enhanced. Then, the improved algorithm was applied to timc series online prediction. Based on the operational data provided by the Northwest power Grid of China, the method was used in the transient stability prediction of electric power system. The results show that, compared with the calculation time of the traditional LS-SVM（75 1 600 ms）, that of the proposed method in different time windows is 40-60 ms, proposed method is above 0.8. So the improved method is online prediction. and the prediction accuracy（normalized root mean squared error） of the better than the traditional LS-SVM and more suitable for time series online prediction.

关键词： time series prediction machine learning support vector machine statistical learning theory

来源：评论

学校读者我要写书评

暂无评论

Numerical prediction of EMI on the secondary DC cable in cable tunnel due to a direct lightning strike in substation

引用

IEEE TRANSACTIONS ON MAGNETICS 2006年第4期42卷 863-866页

作者： Lei, Q Xiang, C Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education School of Electrical Engineering North China Electric Power University Hebei 071003 China

Electromagnetic interference (EMI) on secondary de cable in cable tunnel due to a direct lightning strike in substation threatens the safe operation of electronic equipment and system connected to the cable. In order to reduce EMI, the cable shield is generally connected to the grounding grid at both ends. Ground potential difference between two grounding points of the cable shield can be high due to high impedance of the grounding grid at high frequencies. In this paper, we present a hybrid method to analyze this complex system. As a result, both the current flowing in the cable shield and the transverse voltage between the cable core and shield are calculated. Compared with the measured results, the proposed method is demonstrated to be correct and effective.

关键词： electromagnetic interference (EMI) grounding grid in substation lightning secondary cable

来源：评论

学校读者我要写书评

暂无评论

Analysis of dynamic characteristics and control techniques applied to permanent-magnet direct drive generator based on double time coordinate

Analysis of dynamic characteristics and control techniques a...

引用

2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011

作者： Tang, Niang Hao, Jun-Wei Zhou, Shuang-Ya Xiao, Xiang-Ning Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Beijing 102206 China

ISBN: (纸本)9781612847221

The dynamic operating characteristics of direct drive permanent magnet synchronous generator (PMSG) were researched. A method of non-linear slope pre-charge for DC-bus voltage is proposed on purpose of protecting power electronic devices. By further analyzing, some problems of conventional control strategy for grid-connection are pointed out, and a novel analysis method named double-time coordinate system is proposed, based on which the corresponding control strategy is presented to suppress the gear twisting moment and reduce the impact of grid connected. Simulation and experimental results prove that the proposed theoretical analysis method and control strategy is effective under the platform PSCAD/EMTDC. © 2011 IEEE.

关键词： Permanent magnets

来源：评论

学校读者我要写书评

暂无评论

Research on DC bias due to magnetic storm and DC transmission

Research on DC bias due to magnetic storm and DC transmissio...

引用

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

作者： Shi, Weiping Liu, Lianguang Wang, Qian Liu, Zongqi Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing 102206

ISBN: (纸本)0780391144

This paper focuses on the research on the DC bias due to magnetic storm and HVDC. In the paper, we introduce the DC bias problem of Jiangsu Yang-Huai transmit electric system and Southern power Grids, discuss the harmful effect of the transformer DC bias and the significance of research, and analyze the compensation, weakening and elimination of transformer bias current. Finally, the problems that should be paid attention to and some corresponding suggestions are proposed. © 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

Multiobjective optimization scheduling based on fuzzy genetic algorithm in cascaded hydroelectric stations

Multiobjective optimization scheduling based on fuzzy geneti...

引用

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

作者： Hu, Guoqiang He, Renmu Ma, Rui Wang, Peng Yang, Huachun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing China

ISBN: (纸本)0780391144

The multi-objective fuzzy optimal method based on the fuzzified optimal solutions of single objectives need not list all non-inferior solution sets, which can optimize directly objectives in value area of variables. This method can reflect the interrelation between individual objective optimal solutions and multi-objective optimal solution. On the basis of fundamental principle of multi-objective fuzzy optimization and genetic algorithm, combing with the concept of objective relative subject degree, this paper presents a multi-objective optimization approach for the hydroelectric power system with contradictory objectives. The proposal method considers the satisfied degree of various characters and contradictory objectives and seeks an appropriate optimized solution to make each objective optimal as possible considering each objective comprehensively. The simulation results of example show that the fuzzy genetic algorithm is an effective method for multi-objective optimization problem in the cascaded hydroelectric plants. © 2005 IEEE.

关键词： Hydroelectric power plants

来源：评论

学校读者我要写书评

暂无评论

Simulation research on the multiple objective voltage quality regulator

Simulation research on the multiple objective voltage qualit...

引用

2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Di, Yajing Yin, Zhongdong Xiao, Xiangning Zhang, Zhi Key Laboratory of Power System Protection and Dynamic Monitoring Control Under Ministry of Education University Beijing 102206 China Key Laboratory of Power System Protection and Dynamic Security Monitoring Control North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424424870

Due to the complexity of power systems combined with other factors such as increasing susceptibility of equipment, power quality (PQ) is apt to waver. With electricity in growing demand, low PQ is on the rise. the method of resolve those problem about power quality must be considered. In accordance with the familiar PQ problem, such as voltage sag, voltage swell, short interruption of supply voltage, harmonic suppression and short circuit fault. Basing on the H bridge cascade connection method, this paper design a new type regulator for the multiple objective control. Through the simulation software of PSCAD/EMTDC, the device can resume the voltage and restrain the harmonic dynamically and effectively, when there are voltage disturbances in the power system side. This device also could confine the short circuit current to a supportable level, when there is short circuit fault in the load side. This work was supported by Project Supported by National Mega-projects of Science and Technology for the 11th Five-year Plan (2007BAA12B03). © 2009 IEEE.

关键词： power quality

来源：评论

学校读者我要写书评

暂无评论

Parallel operation of hybrid active power filter with passive power filter or capacitors

Parallel operation of hybrid active power filter with passiv...

引用

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

作者： Xu, Yonghai Xiao, Xiangning Liu, Hao Wang, Hong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing China

ISBN: (纸本)0780391144

Harmonic pollution and reactive power compensation are the important power quality problems. This paper proposes a combined power filter system consisting of the parallel operation of a hybrid active power filter (HAPF) and the passive power filters or capacitors. The HAPF is formed by a single tuned LC filter per phase and a small-rated three-phase active filter, which are directly connected in series. The characteristics of the combined system and the harmonic current detection method using the combination of load current and the mains current are analyzed and simulated. The simulation results show that good filter performance can be obtained by the combined system. Experimental results from a 100kVA/380V hardware prototype parallel operation with capacitors are presented to conform the validity and effectiveness of the combined system. © 2005 IEEE.

关键词： Active filters

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：