检索结果-内蒙古大学图书馆

International Conference on Critical Infrastructures, CRIS

作者： Lan Ding Ancheng Xue Fukun Han Jin Li Maohai Wang Tianshu Bi Jinping Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education School of Electrical and Electronic Engineering North China Electric Power University Beijing China North China Power Dispatching Center Beijing China North China Electric Power Research Institute Company Limited Beijing China

Once the power system low frequency oscillation occurs, the operators desire to find out the dominant mode LFO so as to take measures to suspend it. This paper proposes an identification method for dominant mode of LFO based on Prony algorithm in wide-area measurement system (WAMS). The presented method contains three steps, the first step is preprocessing of Prony analysis result, the second step is the dominant mode identification, and the third step is the grouping of different generators according individual generator's frequency and phase information. Among the dominant mode identification step, three indexes are proposed to select the dominant mode. The first one is the ratio of amplitude and damping ratio; the second one is mode energy and the third one is the amplitude of sinusoidal decay mode after a period of oscillation. The simulation results in a two-area-four-machine benchmark system and 10 generator 39-bus New England system by DSATools demonstrate that the proposed method has strong adaptability to noise, i.e., the method has good performance of identification.

关键词： Generators Oscillators Indexes Algorithm design and analysis Equations Damping power systems

来源：评论

学校读者我要写书评

暂无评论

A new node contribution factors for the low frequency oscillations of power system based on the PMU's data and HHT

A new node contribution factors for the low frequency oscill...

引用

International Conference on Critical Infrastructures, CRIS

作者： Jin Li Ancheng Xue Jinping Wang Lan Ding Maohai Wang Tianshu Bi Fukun Han Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing P. R. China North China Electric Power Research Institute Co.Ltd Beijing P. R. China North China Power Dispatching Center Beijing P. R. China

With the rapid development and interconnection of power systems, the low frequency oscillations(LFO) has become one of the serious factors threatening the power system stability. Thus, how to quickly locate the source of LFO and implement controller to suspend it, is an urgent task. The general approach to locate the sources of LFO is using the node contribution factor(NCF), which indicating the contribution of the node(generator) in the oscillation. This paper aims at proposed a new more effective method to calculate the NCF for LFO based on the HHT and data obtained with Wide Area Measurement system (WAMS). As general philosophy, the proposed NCF is defined as the ratio of the generators' node oscillation energy(NOE) and the total oscillation energy(TOE), related to a particular oscillation mode. The NOE and TOE is defined based on the intrinsic mode functions(IMFs), which is obtained with the application of the HHT method. In detail, the (individual) node oscillation energy is defined as the product of the node's oscillation amplitude and cosine of relative phase. And the TOE, is defined the positive (or reverse respectively) group total energy for the node in the positive or reverse respectively, where the positive (or reverse respectively) group total energy is the cumulative energy of all nodes in the positive(or reverse respectively) group. And the generator grouping is obtained according to the phase, which is defined for the IMFs obtained with the HHT method. Simulation results in 4-machine and 17-machine system show that the proposed algorithm for NCF is more effective than the existed algorithm. And furthermore, the active power signals have better performance than the angle signals.

关键词： Oscillators Algorithm design and analysis power systems Eigenvalues and eigenfunctions Simulation Generators Transforms

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

A novel voltage balance control strategy of AC-DC-AC converter

A novel voltage balance control strategy of AC-DC-AC convert...

引用

2009 International Conference on Energy and Environment Technology, ICEET 2009

作者： Yang, Zhang Yin, Zhong-Dong Tao, Huang Qiu, Hong Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9780769538198

A general problem in the double PWM converter is the voltage unbalance of the dc-link capacitors. This unbalance distorts the waveforms of the output voltage and current. Furthermore, it will lead to instability of the inverter system. Based on the analysis for the unbalance problem, a novel feedback control strategy of DC capacitor voltage deviation is proposed in this paper. The method does not add extra circuit. Build an simulation model of AC-DC-AC converter, the results show that control strategy is correct. © 2009 IEEE.

关键词： Pulse width modulation

来源：评论

学校读者我要写书评

暂无评论

Design of PV array model based on EMTDC/PSCAD

Design of PV array model based on EMTDC/PSCAD

引用

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

作者： Xue, Jinhui Yin, Zhongdong Wu, Bingbing Peng, Jun Key Laboratory of Power System Protection and Dynamic Security Monitoring Control under Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424424870

Along with consuming of fossil energy step by step, crisis of energy has been appeared. The solar energy, which is endless, is a kind of renewable energy. Radiation of sun coming to earth in a day is equal to the energy, which is released by trillion buckets of oil. The research of solar energy generation has stepped into a very activity period. This paper analyses the physics characteristic of photovoltaic array firstly, then researches the mathematical model applying in engineering, and designs the total simulation model based on power electronic circuit in the end. In order to validate the correctness and validity, this paper makes a simulation as an example. The scheme can express the V-I characteristic of photovoltaic array very well. © 2009 IEEE.

关键词： Solar energy

来源：评论

学校读者我要写书评

暂无评论

Technology research of novel energy storage control for the PV generation system

Technology research of novel energy storage control for the ...

引用

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

作者： Xue, Jinhui Yin, Zhongdong Wu, Bingbing Wu, Ziping Li, Jun Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424424870

Recent years, technologies for new energy have developed rapidly since the energy crisis and the environmental pollution got worse. And the solar energy generation technology tends towards the stage of a large number of applications in engineering from the research stage. This paper designed a grid-connected PV system firstly, then introduced the operation principle of the various parts as well with the control strategy of the power flow. The design of energy storage is of great significance as the output power of PV cells array is greatly affected by the light intensity and the temperature change. Battery is used as the energy storage device normally in the traditional energy storage system. In this paper, it used the Ultracapacitor as the energy storage device after comparing with the battery, and designed the charge-discharge control strategy according to the characteristics of the Ultracapacitor. Finally it verified the feasibility of the energy storage control strategy through the simulation models which was built based on the PSCAD/EMTDC platform. © 2009 IEEE.

关键词： Supercapacitor

来源：评论

学校读者我要写书评

暂无评论

Fault diagnosis based on cluster analysis theory in wide area backup protection system

Fault diagnosis based on cluster analysis theory in wide are...

引用

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

作者： Zhang, Yagang Ma, Jing Zhang, Jinfang Wang, Zengping Key Laboratory of Power System Protection and Dynamic Security Monitoring Control under Ministry of Education North China Electric Power University Baoding 071003 China

ISBN: (纸本)9781424424870

In wide area backup protection of electric power systems, the prerequisite of protection device's accurate, fast and reliable performance is its corresponding fault type and fault location can be discriminated quickly and defined exactly. In our researches, global information has been introduced into the backup protection system. By analyzing and computing real-time PMU measurements, basing on cluster analysis theory, we are using mainly hierarchical cluster analysis technology to seek after for the statistical laws of electrical quantities' marked changes. Then we carry out fast and exact identification of faulty components and faulty sections, and finally accomplish fault isolation. Multivariate statistical analysis theory is an efficient theory that can resolve different kinds of complex problems. It has been applied successfully in many researches of various fields, such as geology, weather, hydrology, iatrology, industry, agriculture, and economy, etc. In the study of electric power systems, multivariate statistical analysis theory must also have a good prospect of application. © 2009 IEEE.

关键词： Cluster analysis

来源：评论

学校读者我要写书评

暂无评论

The finite elements analysis on magnetic field of controllable saturated reactor

The finite elements analysis on magnetic field of controllab...

引用

2009 International Conference on power Electronics and Drive systems, PEDS 2009

作者： Ziqiang, Wang Zhongdong, Yin Po, Yang Ke, Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

ISBN: (纸本)9781424441662

In the power system, the controllable reactor can be used as reactive power compensation device to limit over-voltage operation, reduce no-load or light load loss and improve transmission capacity. It is with characters of simple structure, easy maintaining, low cost and high stability, etc. The magnetic field is closely related to the reactor performance. In this paper, aiming at a controllable saturated reactor prototype, using the finite elements method, the magnetic field is studied. Then, the precise 2-D prototype field-circuit coupling model is established based on the magnetic field analysis and the finite element analysis software - ANSYS. Using this model, the magnetic field and working currents concrete values under the condition that AC and DC excitations co-exist within the core are calculated. The analysis results indicate that finite element analysis theory can effectively analyze the magnetic field of the reactor.

关键词： Magnetic fields

来源：评论

学校读者我要写书评

暂无评论

RETRACTED ARTICLE: Passive islanding detection method for grid connected PV system

RETRACTED ARTICLE: Passive islanding detection method for gr...

引用

2009 International Conference on Industrial and Information systems, IIS 2009

作者： Wang, Fei Mi, Zengqiang Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)9780769536187

Passive islanding detection method is an important concern for grid connected photovoltaic (PV) power generation system due to personnel and equipment safety. Over/under Voltage protection (OVP/UVP) and Over/under Frequency protection (OFP/UFP) are basical inverter resident passive islanding detection method (IDM) for detecting an islanding condition by monitor parameters in Point of Common Coupling (PCC) such as voltage amplitude and frequency and then cause the inverter to shut down when there is sufficient transition from normal specified conditions. The real and reactive power equations and Non-Detection Zone (NDZ) of OVP/UVP and OFP/UFP methods for grid connected PV system are derived and analyzed in this paper. Analyses show that the behavior of the system at the time of disconnection will depend on the imbalance power at the instant before the switch opens to form the island, these results also indicate the NDZ of OVP/UVP and OFP/UFP methods is considerable large and the reaction times for these protective methodologies may be variable or unpredictable. © 2009 IEEE.

关键词： Distributed power generation

来源：评论

学校读者我要写书评

暂无评论

New research advancement in electrical engineering field of China-Reviews on special issue of Science in China Series E:Technological Sciences

引用

Chinese Science Bulletin 2009年第8期54卷 1285-1286页

作者： MEI ShengWei MA Jin State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing 100084 China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing 102206 China

Based on,but not limited to the research results of electrical engineering published in the special issue of Science in China Series E,June 2008,this essay gives a brief review on a wide range of state-of-art advancement in electrical engineering field of China,which includes power system modeling,analysis and control,risk assessments in power system,etc.

关键词：电气工程工程领域技术科学电力系统研究成果中国科学系统建模风险评估

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：