检索结果-内蒙古大学图书馆

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

作者： Zhe Sun Chunlin Guo Yonghai Xu Xiangning Xiao Yingying Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing P. R. China

Theoretical and simulated analysis on the injection circuit parameters of the controllable Custom power Quality Disturbance-Generator which is designed as differentiation cascade type has been done. The topology has three modules: fundamental-frequency module, high-frequency module and rectifier module. The theoretical analysis results have shown that the regulation precision of output of the fundamental-frequency module, the voltage level of the high-frequency module, the current tracking performance and the harmonic current circumfluence in the high frequency module will be influenced by the linking inductor of the fundamental-frequency module. The harmonic current output of the high-frequency module will be influenced by the linking inductor of the high-frequency module. Furthermore, taking a capacitor in series with the inductor in the injection circuit of the high-frequency module is an effective method to reduce the voltage level of the high-frequency module. However, this method will influence the amount of the fundamental frequency current that generated by fundamental-frequency module. The simulations have been carried out to show the correctness of the theoretical analysis and provide a reference for parameters selection of the injection circuit and the design of the device's control methods.

关键词： power quality Inductors Analytical models Circuit simulation Voltage Frequency Joining processes Circuit topology Rectifiers Harmonic analysis

来源：评论

学校读者我要写书评

暂无评论

Q impact of load characteristic on dynamic security region of power system

Q impact of load characteristic on dynamic security region o...

引用

International Conference on power System Technology (powerCON)

作者： Zhenbo Cao Ancheng Xue Jin Li Tianshu Bi 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

DSR (dynamic security region) is one of the direct methods focusing on the transient stability of power system. This paper focuses on the DSRs of power system with different load models, and explores the characteristic of the DSRs of the power system with constant impedance load and motor load. It deduces the algorithm for DSR of power system described with differential algebraic equation, after introducing the theory of DSR for power system with network-reduction model. And then, it presents the mathematical models for the constant impedance load and motor load. Based on the simulation results, it presents the DSRs for the power system with respect to constant impedance load and motor load, respectively. And furthermore, it compares the characteristic of the DSRs of power system with different loads, and summarizes the impact of different loads characteristic on the DSR.

关键词： power system stability power system dynamics Linear approximation Stability analysis Induction motors

来源：评论

学校读者我要写书评

暂无评论

The Study on the Compensation Strategy of Three Single-Phase H-bridge DVR

The Study on the Compensation Strategy of Three Single-Phase...

引用

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

作者： Zhe Sun Chunlin Guo Yonghai Xu Xiang ning Xiao Ying ying Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing P. R. China

Three single-phase H-bridge DVR is a kind of dynamic voltage restorer (DVR) which is used very widely. The traditional analysis method of compensation strategy has some shortcomings so that it is not suitable for this kind of DVR. A new analysis method which could overcome the shortcomings of the tradition method is proposed in the paper. The new method not only has definite physical concept but also could determine the compensation range easily when unbalanced voltage sag happened. More importantly, it could be applied to unbalanced load. Adopting the new method, the compensation strategy of three single-phase H-bridge DVR is studied. The simulation result shows the correctness of the theoretical analysis.

关键词： Voltage fluctuations power system dynamics power system restoration Analytical models Clocks Sun Laboratories power system protection power system security monitoring

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

Impact of electromechanical coupling on shaft torsional dynamics

引用

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2010年第4期30卷 49-55页

作者： Chen, Wu-Hui Bi, Tian-Shu Yang, Qi-Xun Peng, Qian Key Lab. of Power System Protection and Dynamic Security Monitoring and Control Ministry of Edu. North China Electric Power University Beijing 102206 China State Nuclear Electric Power Planning Design and Research Institute Beijing 100094 China

The electromechanical coupling model is employed to define the all-mode shape and torsional mode shape, and deduce the linear solutions of torques. Based on the solutions of torques, mode shapes of torques and mode contribution factors of torques are defined. The above physical concepts can directly describe shaft torsional dynamics, and get more insights than the mode shapes previously defined. Moreover, the theoretical basis and the physical implications of free vibration and forced vibration models are analyzed in detail. In light of the difference between the electromechanical coupling model and the free vibration model, the deviations between the calculated and measured values are explained for mode shapes and natural torsional frequencies. The difference between the dynamics of the electromechanical coupling and forced vibration models is analyzed as well. © 2010 Chin. Soc. for Elec. Eng.

关键词： Electromechanical coupling

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

power system transmission section security protection control program

Power system transmission section security protection contro...

引用

International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Gang Li Zeng-Ping Wang Jian-Wen Ren Xu-Feng Zhen Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China Baoding Power Supply Company Baoding China

The removal of overload lines can cause power flow transferring, which may give rise to some transmission lines overload. By analysis of available methods of determining transmission sections with shortcomings, this paper proposes a new way to determine transmissions section based on real-time power flows, and then deduce a new criterion of transmission section security protection based on the redundancy of normal line's power flows. A new transmission section security protection control scheme based on wide area measurement system (WAMS) is also proposed. When there is line overload, we should make a decision according to the protection criterion, if the transmission lines are safe after the overload removal, allow the backup protection to cut off the overload line; if not, block the protection. Therefore, it can avoid cascading overload tripping. At last, the validity of proposed algorithm is verified by the simulation results of CEPRI 36-bus system.

关键词： security Load flow Redundancy Real time systems power system dynamics Machine learning

来源：评论

学校读者我要写书评

暂无评论

A transmission line overload control program based on wide area information

A transmission line overload control program based on wide a...

引用

International Conference on Machine Learning and Cybernetics (ICMLC)

When taking emergency control measures to eliminate the overload circuits, it is necessary to ensure the normal lines of power system won't overload. Therefore, it's necessary to analyze the security of the normal lines when take measures to eliminate overload. Based on the analysis of traditional methods of eliminating overload lines, this paper proposes an new overload control scheme based on wide area information, which can in parallel analyzing the impact of the normal line's redundancy on the regulated quantity of matching units, then the analysis results are sent to the control center, which finally determines the regulated quantity. It can ensure the normal lines won't overload when eliminating overload, and also can improve the computing speed of the whole control process. Therefore, it's very conducive to ensure the power system operating in a safe and stable state. Finally, simulation experiments verify the program is fast and reasonable.

关键词： Sensitivity security Load flow power system dynamics Redundancy Machine learning

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

Comparison of Transient Stability between Wind Farm Based on DFIG and Traditional power Plant in an Actual Grid

Comparison of Transient Stability between Wind Farm Based on...

引用

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

作者： Hongjing Hou Li Lin Tao Wu Youzhong Miao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China North China Electric Power Research Institute Company Limited Beijing China

As a clean renewable energy, wind energy draws more and more attention around the world. In case of high wind speed or low speed but substantial installed wind power capacity, wind turbine generators (WTGs) will take the place of traditional power plant partly. Under the circumstance, the transient stability will change. Therefore, in this article, the synthetical dynamic model of WTG is introduced first, and on the basis of it, the article focus on the comparison of transient stability characteristic between wind farm based on double fed induction generator (DFIG) and tradition power plant with the same capacity. Take an actual grid including wind farm as an example. The power factor of the wind farm is 1.00 and keeps constant during steady state. Under this control mode, the reactive power between wind farm and the grid is zero. The study indicates that, in this system, when the scale of wind farm connected is below 12.3%, the transient stability is better than synchronous generator integrated with the identical capacity. And with the increasing capacity of wind farm, the fault critical clearing time (CCT) is shorter, and it lasts longer time during the recovery. When the scale of wind farm exceeds 12.3%, the terminal voltage of point of common coupling (PCC) is below 0.95 p.u. The stability is inferior to the synchronous generator connected. Under the circumstance, the stability will be enhanced through adding the reactive power compensative device.

关键词： Stability Wind farms power generation Wind energy Reactive power Synchronous generators Renewable energy resources Wind speed Wind turbines Wind energy generation

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：