检索结果-内蒙古大学图书馆

Information entropy based contingency selection for available transfer capability calculation

Information entropy based contingency selection for availabl...

2010 International Conference on power system Technology: Technological Innovations Making power Grid Smarter, powerCON2010

作者： Zheng, Yanan Zhou, Ming Li, Gengyin Lo, K.L. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW United Kingdom

ISBN: (纸本)9781424459407

Available Transfer Capability (ATC) is a measure of the transfer capability remaining in the physical transmission network for further commercial activity over and above already committed uses. Putting forward against the defect that the traditional contingency selection method uses single index to enumerate states or disturbances, this paper introduces the active power behavior index and the voltage-reactive power behavior index, and uses the entropy weight to rank and select the states which seriously affect the system;then from the point of both safety and economy, optimal power flow model is used in every power flow calculation;last introduces the maximum entropy principle to research the probability distribution of ATC. By simulating on the IEEE-14 bus test system, the proposed method has the advantages over the conventional approach in contingency selection, calculation accuracy and processing speed. ©2010 IEEE.

关键词： Probability distributions

来源：评论

学校读者我要写书评

暂无评论

Energy storage control for the photovoltaic generation system in a micro-grid

Energy storage control for the photovoltaic generation syste...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Wang, Zhongqiu Li, Xi Li, Gengyin Zhou, Ming Lo, K.L. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW United Kingdom

ISBN: (纸本)9781424480814

Distributed generation (DG) that uses renewable energy sources has an unstable output and this can negatively affect existing electric power systems. In order to reduce above impact, we need to develop an energy control system to control the output through individual DG installed in a micro-grid. First, this paper designs a grid-connected Photovoltaic (PV) system and introduces 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. Then, it uses the battery as the energy storage device and designs the charge-discharge control strategy according to the characteristics of the battery. Finally it verifies the feasibility of the energy storage control strategy through the simulation models which is built based on the PSCAD/EMTDC platform. © 2010 IEEE.

关键词： Energy storage

来源：评论

学校读者我要写书评

暂无评论

Intelligent diagnosis algorithm of power equipment based on acoustic signal processing

Intelligent diagnosis algorithm of power equipment based on ...

引用

International Workshop on Advanced Computational Intelligence (IWACI)

作者： Shutao Zhao Baoshu Li Yumin Ge Weiguo Tong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China School of Control Science and Engineering North China Electric Power University Baoding Hebei China

ISBN: (纸本)9781424463343

The operational state determination of power equipment is a key prerequisite to realize maintenance. On studying the relationship between power equipment state and its acoustic wave mutation character, a new diagnosis scheme of power equipment fault has been put forward. After the running acoustic signal acquired, MFCC coefficient has been selected the acoustic signal various band energy feature, and dynamic time warping (DTW) is utilized to determine equipment type. Then local energy band based wavelet packet decomposition is used in fault feature extraction. According to these feature parameters values and expert experience scoring, the knowledge based of fault database was established to diagnosis power equipment state and its fault level. Lastly, By 200 group transformer measured acoustic signal analysis experiments have been completed, and the results show the series acoustic treatment of methods is effective, and the diagnosis scheme of equipment failures have great practical value.

关键词： Feature extraction Wavelet packets Fault diagnosis Mel frequency cepstral coefficient Band pass filters

来源：评论

学校读者我要写书评

暂无评论

Multi-objective Voltage Quality Disturbance Generator with Cascade H-bridges

Multi-objective Voltage Quality Disturbance Generator with C...

引用

IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Renzhong Shan Xiangning Xiao Zhongdong Yin Qiao Liu Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

A novel main circuit topology of voltage quality disturbance generator is proposed in this paper, composed of PWM rectifier and cascade H bridge inverter. The three phase inverter is decoupling controlled. The main advantage of the topology is a hybrid structure, the mainly power of voltage quality disturbance generator is supplied by system source and the small power is supplied by inverter, so the capacitor generator is easy to realize larger because of lower active loss. PWM rectifier is adopted to maintain the dc-bus voltage stably, the later inverter is composed of cascade H-bridges. The inverter is controlled by carrier phase shifting with FPGA. The simulation model is set up on the platform of PSCAD/EMTDC, the problems of voltage fluctuation and flicker, sag and harmonic is researched by theoretical analysis and simulation. Finally, the simulation and experimental results show that the proposed main circuit topology and control strategy is feasible and efficient.

关键词： Pulse width modulation inverters Circuit topology Circuit simulation Rectifiers power generation Hybrid power systems Analytical models Voltage fluctuations Bridge circuits power supplies

来源：评论

学校读者我要写书评

暂无评论

Analysis of Nonlinear Torsional dynamics Using Second-Order Solutions

引用

IEEE Transactions on power systems 2010年第1期25卷 423-432页

作者： Wuhui Chen Tianshu Bi Qixun Yang Jixiang Deng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Northeast Dianli University Jilin China

Based on the modal series method, this paper derives the second- and first-order solutions of torques for investigating nonlinear torsional dynamics. The derivatives of the two types of solutions are compared to explain the advantage of the second-order solutions. The index is given for evaluating the feasibility of solutions. Subsequently, several nonlinearity indices are defined to quantify the effects of nonlinear modal interactions on torsional dynamics, and the suitable indices are determined for analyzing nonlinear torsional dynamics. The systematic method is developed for the analysis of nonlinear torsional dynamics. Furthermore, the concept of nonlinear modal interactions is extended to deal with both the fundamental and the combination modes; the nonlinearity contribution factors are emphasized. The study is implemented on two modified cases from the IEEE first benchmark model, which validates the presented method for investigating torsional dynamics in the stressed case and gives new engineering insights into nonlinear torsional dynamics.

关键词： Nonlinear dynamical systems power system dynamics power system transients Modal analysis Torque Bismuth Resonance Steady-state Electromagnetic transients Electromagnetic analysis

来源：评论

学校读者我要写书评

暂无评论

Comparison and verification of load model based on PSASP

Comparison and verification of load model based on PSASP

引用

International Conference on Critical Infrastructures, CRIS

作者： Huilin Wang Jin Ma Xiaoyu Zheng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education School of Electrical and Electronic Engineering North China Electric Power University Beijing China

In load model verification process, the accuracy of model and its parameters makes the actual operating conditions unable to reappear in simulation. The information deviation between measured data and verifiable simulation data makes it impossible to ensure the descriptive power of measurement-based load model for real load characteristics. With this problem, the paper applies closed-loop verification approach to this question for the first time. The closed-loop verification approach is common in system identification study but newly used in load model comparison and validation. Two cases based on PSASP are studied in the paper. The object of this study is composite load model and the verification is carried out on a 10-generator, 39-bus New England power system. They both prove the validity of composite load model and the feasibility of this verification approach.

关键词： Load modeling power system dynamics Data models Helium Generators Integrated circuit modeling

来源：评论

学校读者我要写书评

暂无评论

Dominant mode identification for low frequency oscillations of power systems based on prony algorithm

Dominant mode identification for low frequency oscillations ...

引用

International Conference on Critical Infrastructure

作者： Ding, Lan Xue, Ancheng Han, Fukun Li, Jin Wang, Maohai Bi, Tianshu Wang, Jinping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China North China Power Dispatching Center Beijing 100053 China North China Electric Power Research Institute Co.Ltd Beijing 100045 China

ISBN: (纸本)9781424480814

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. © 2010 IEEE.

关键词： Benchmarking

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 Infrastructure

作者： Li, Jin Xue, Ancheng Wang, Jinping Ding, Lan Wang, Maohai Bi, Tianshu Han, Fukun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China North China Power Dispatching Center Beijing 100053 China North China Electric Power Research Institute Co.Ltd Beijing 100045 China

ISBN: (纸本)9781424480814

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. © 2010 IEEE.

关键词： Intrinsic mode functions

来源：评论

学校读者我要写书评

暂无评论

Compensation strategy of switching dead-time effect based on frequency domain model

Compensation strategy of switching dead-time effect based on...

引用

IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Renzhong Shan Xiangning Xiao Zhongdong Yin Qiao Liu Key Laboratory of Power System Protection and Dynamic. Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

The problem of current waveform distortion because of dead-time inserted in power electronic applications is analyzed and researched in this paper, and the equivalent voltage source model is set up in to analyze the low frequency harmonic voltage because of dead-time effect. The control strategy of harmonic injection is proposed to compensate the current distortion due to dead-time effect. Firstly, obtains the application output current amplitude and phase of mainly harmonic current by Fourier transform, then calculates the compensation instructive voltage according to the connected inductor and dc voltage. Based on H-bridges cascaded static synchronous compensator (STATCOM), the experiment on a STATCOM based on digital signal processor (DSP) and (Field Programmable Gate Array) FPGA is implemented. The simulation and experimental results show that the proposed method is feasible and efficient to compensate the current distortion.

关键词： Frequency domain analysis Harmonic distortion Harmonic analysis Automatic voltage control Field programmable gate arrays power electronics power system harmonics Low voltage Fourier transforms Inductors

来源：评论

学校读者我要写书评

暂无评论

A novel method for determining minimum break point set based on network reduction and relays incidence matrix

A novel method for determining minimum break point set based...

引用

International Conference on Critical Infrastructures, CRIS

作者： Donghua Ye Jing Ma Zengping Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

This paper presents a simple and effective approach based on two dynamic matrixes of node-relay matrix (NRM) and relay-incidence matrix (RIM) to determine minimum break point set (MBPS) for coordination of the directional relays. Firstly, the NRM and RIM are defined and their calculation methods are developed. Then, some optimization operations for network reduction and special structure are presented to update the NRM and RIM and the detailed flowchart is provided. At last, case studies on various topologies demonstrate the effectiveness and simplicity of the proposed method.

关键词： power system dynamics Phantoms Network topology Protective relaying Heuristic algorithms

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：