检索结果-内蒙古大学图书馆

Advanced control strategy of SVC based on artificial immune algorithm

Journal of Computational Information systems 2015年第6期11卷 1965-1972页

作者： Chen, Saisai Li, Kejun Jing, Ping Zha, Guoliang Tian, Xin Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China Smart Grid Research Institute of State-Grid Changping District Beijing China

For the conventional Static Var Compensator (SVC), there is a contradiction between the response time and system stability. An advanced control strategy is proposed in this paper. Improved Proportional Integral (PI) controller and Artificial Immune Algorithm are adopted in SVC control system, with the response speed of SVC as objective function of optimization. Meanwhile, a non-linear link is added to ensure the stability of the system. The non-linear link is proved that it can significantly improve the stability of the nonlinear system. Simulation results show that the new SVC control strategy can not only track the set voltage value of SVC quickly, but also comprehensively compensate for reactive power and three-phase imbalance. Copyright © 2015 Binary Information Press.

关键词： Static Var compensators

来源：评论

学校读者我要写书评

暂无评论

Fault transient simulation analysis for HVDC transmission lines

Fault transient simulation analysis for HVDC transmission li...

引用

International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Luhua Xing Dong Yang Dandan Zhang Wenbo Li Qing Chen State Grid Shandong Electric Power Research Institute Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

Fault transient analysis plays an important role in protection and fault location research for high voltage direct current (HVDC) transmission lines. Fault transient simulation methods and analysis for HVDC transmission lines are detailed presented in this paper, to avoid repetitive tasks and waste of research efforts. Influences of the control system, operation modes and direct current (DC) filter links on the fault transient simulation analysis for HVDC transmission lines are discussed. Transient characteristics of voltages and currents on HVDC transmission lines for faults on HVDC transmission lines, lightning strokes and commutation failures are analyzed, and corresponding simulation methods are also given.

关键词： Lightning Transient analysis power industry Bidirectional control Resistance Decision support systems

来源：评论

学校读者我要写书评

暂无评论

Probability model of power equipment maintenance based on full state process

引用

Open Electrical and Electronic Engineering Journal 2015年第1期9卷 99-106页

作者： Wang, Yantao Han, Xueshan Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan250061 China School of Economics and Management Northeast Dianli University Jilin132012 China

Equipment maintenance is one of the core tasks in power system operations. The premise and foundation for maintenance is to establish a power equipment maintenance model, which should reflect all equipment states accurately including operation, inspection and maintenance. On the basis of the analysis of the traditional state diagram probability model, an improvement is put forward to revise the model for keeping in line with the actual operation and maintenance situation of power equipment. The effectiveness and practicability of the improved model are validated perfectly by comparing the result of the improved model with the traditional model. © Wang and Han.

关键词： Maintenance

来源：评论

学校读者我要写书评

暂无评论

Analysis of static VAr compensators installed in different positions in electric railways

引用

IET ELECTRICAL systemS IN TRANSPORTATION 2015年第3期5卷 129-134页

作者： Wang, Hui Liu, Ying Yan, Kun Fu, Yongsheng Zhang, Chenghui Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China Shandong Univ Sch Elect Engn Jinan 250061 Shandong Peoples R China State Grid Jibei Elect Power Co Ltd Langfang Power Supply Co Langfang 065000 Hebei Peoples R China State Grid Smart Grid Res Inst EPRI Sci Technol C Beijing 100192 Peoples R China Shandong Univ Sch Control Sci & Engn Jinan 250061 Shandong Peoples R China

With the power quality problems of electric railways becoming more and more serious, static VAr compensators (SVCs) have been widely used for power quality management. SVCs can be installed in the low-voltage side of traction substations, the high-voltage side of traction substations or the electric railway power supply side of substations. Different installation positions result in different compensation effects. In this study, characteristics of harmonic and negative sequence currents in the low-voltage and high-voltage sides of traction substations are analysed theoretically. Four schemes with SVCs in different installation positions are proposed. Then based on the measured datum and waveforms, simulation of each scheme is implemented, respectively, using PSCAD/EMTDC software. By comparing the compensation effects of the four schemes, the best SVC installation scheme in the low-voltage side of the traction substation is recommended for the measured traction substation. With SVC, the electric railway will have a less negative effect on the power grid. This study can also be applied to other SVC applications with non-linear loads, such as arc furnaces, rolling mills or electrochemical devices.

关键词： static VAr compensators power supply quality substations railway electrification power grids power system harmonics traction power supplies static VAr compensator analysis SVCs power quality management traction substations low-voltage side high-voltage side electric railway power supply compensation effects negative sequence currents harmonic characteristics PSCAD-EMTDC software power grid nonlinear loads arc furnaces rolling mills electrochemical devices

来源：评论

学校读者我要写书评

暂无评论

Consistency analysis of SCADA data from field power systems

Consistency analysis of SCADA data from field power systems

引用

10th International Conference on Advances in power system control, Operation & Management (APSCOM 2015)

作者： Yaping Zhang Hengxu Zhang Liang Wang Guangsong Hou Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education School of Electrical Engineering Shandong University Jinan China Dispatch and Control Center of Shandong Electric Power Corporation Jinan China Heze Power Supply Company of State Grid Shandong Electric Power Corporation China

ISBN: (纸本)9781510830059

SCADA (Supervisory control And Data Acquisition) system is a basic infrastructure of modern power systems. SCADA data are widely used in applications such as state estimation, power flow calculation, and on-line security assessment. The accuracy of the SCADA data directly affects the implementation of power system automatic control. In practice, the error of the SCADA data may deviate from its factory precision due to the influence of the equipment aging, data transmission and so on. To quantitatively evaluate the validity of the SCADA data, a consistency index is defined in this paper. Some SCADA data from several substations of a power gird is checked with the consistency index to reveal its reliability.

关键词： consistency power systems SCADA error analysis

来源：评论

学校读者我要写书评

暂无评论

Analysis on single-phase line break fault of 10kV non-grounded distribution network

Analysis on single-phase line break fault of 10kV non-ground...

引用

International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Rui Wang Wei Cong Qibao Kang Guoqiang Liu Hui Wang Ruipeng Yi Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan Shandong Province China Binzhou Power Company State Grid Shandong Corporation Binzhou Shandong Province

ISBN: (纸本)9781467371070

Line break fault is becoming more and more frequent in 10kV neutral point non-grounded distribution system. This paper takes 10kV distribution line single-phase line break fault as the research object, analyzes the characteristics of electrical quantities when single-phase line break fault occurs, including single-phase line break without grounding point, single-phase line break with grounding at power supply side and single-phase line break with grounding at load side. Electrical quantities during single-phase line break fault are analyzed using symmetrical component method with sequence network and vector diagram, the variation of electrical quantities are summarized, and protection criterion for single-phase line break fault is proposed. Simulation results by PSCAD/EMTDC ensure the correctness of the analysis results and line break protection criterion.

关键词： Grounding Decision support systems power supplies Impedance power industry Simulation Analytical models

来源：评论

学校读者我要写书评

暂无评论

Wind power forecasting based on a Markov chain model of variation

Wind power forecasting based on a Markov chain model of vari...

引用

International Conference on Fuzzy systems and Knowledge Discovery (FSKD)

作者： Jingwen Sun Zhihao Yun Jun Liang Ying Feng Tianbao Zhang Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China Economic & Technology Research Institute State Grid Shandong Electric Power Company Jinan China

In order to provide more decision-making information and improve the effects of probabilistic forecasting, a novel wind power probabilistic forecasting approach based on Markov chain model of variation is proposed in this paper. The transition probabilities matrix of Markov chain model is built from the variations of historical wind power data to compute probability distributions and deterministic wind generation at future moments. Refined state space is built because the value of variation is much smaller than wind generation, which could improve the prediction accuracy. The effectiveness and higher accuracy of proposed approach are proved by actual data from wind farm.

关键词： Wind power generation Markov processes Forecasting Predictive models Probabilistic logic Wind forecasting Wind farms

来源：评论

学校读者我要写书评

暂无评论

A Coordination control Strategy of Voltage-Source-Converter-Based MTDC for Offshore Wind Farms

A Coordination Control Strategy of Voltage-Source-Converter-...

引用

IEEE Transactions on Industry Applications

作者： Wang, Zhuo-Di Li, Ke-Jun Ren, Jing-Guo Sun, Li-Jun Zhao, Jian-Guo Liang, Yong-Liang Lee, Wei-Jen Ding, Zhao-Hao Sun, Ying Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China State Grid Shandong Electric Power Research Institute Jinan China State Grid of China Technology College Jinan China Energy Systems Research Center University of Texas at Arlington ArlingtonTX United States

Similar to other major electrical apparatuses, the reliability and stability of the dc network is becoming the most important issue when using the voltage-source-converter-based multiterminal dc (VSC-MTDC) system for offshore wind power integration. A coordinated control strategy of VSC-MTDC named master-auxiliary is proposed by combining the advantages of the voltage margin and voltage droop control. This strategy has three advantages. First, the master converter station with the constant dc voltage control can provide reference to the system dc voltage and is helpful for the stabilization of dc voltage. Second, the integrated control of the dc voltage in both master and auxiliary converter stations are helpful for providing adequate active power control (APC) and restraining large power variation. Third, the APC converter station can serve as a backup for the dc voltage control in abnormal conditions. In order to guarantee the reliability and stability of the system under various operating conditions, this paper introduces the priority of dc voltage control to the coordination control strategy. Moreover, a parameter optimizing method of controllers for this strategy is also proposed. Finally, the effectiveness of the master-auxiliary control is verified by simulations under normal and abnormal conditions. © 2015 IEEE.

关键词： Offshore wind farms Electric utilities system stability Voltage control Wind power Auxiliary control Coordination control Direct current Multi terminal dc Voltage source converters

来源：评论

学校读者我要写书评

暂无评论

Dynamic power flow calculation method of power system with wind power

Dynamic power flow calculation method of power system with w...

引用

International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Ruohan Wang Hengxu Zhang Changgang Li Changhui Ma Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education (Shandong University) Jinan China Shandong Electric Research Institute Jinan China Jinan China

ISBN: (纸本)9781467371070

High penetration of renewable energy nowadays makes it necessary to take wind power plants and solar power plants into consideration when calculating dynamic power flow. The paper mainly focuses on the approach to deal with wind turbine in power flow calculation and the power-frequency characteristics of it after attaching it to power system. Firstly, the concept and major steps of dynamic power flow calculation are illustrated. The whole procedure is programmed in Fortran language and ready for case study. By ignoring some negligible variables, the simplified model of wind turbine which considers it as PQ bus is put forward. This model brings convenience to dynamic power flow calculation with wind power and its rationality can be guaranteed to a certain degree. With this model, the power-frequency relationship of wind turbine is obtained through mathematical deduction and the complex static frequency modulation coefficient of wind farm is calculated in order to execute dynamic power flow calculation. In a specific case, IEEE 30-bus system is modified to be used to test the presented algorithm.

关键词： Wind turbines Frequency modulation Load flow Wind power generation Generators power system dynamics Mathematical model

来源：评论

学校读者我要写书评

暂无评论

Frequency response model considering large frequency deviation

Frequency response model considering large frequency deviati...

引用

International Conference on Industrial Instrumentation and control (ICIC)

作者： Yuzheng Xie Hengxu Zhang Huadong Sun Shiyun Xu Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan P.R. China China Electric Power Research Institute Beijing P.R. China

ISBN: (纸本)9781479971664

Large frequency deviation affects the output of auxiliary equipment of thermal power plant, which in turn will impact the operational security and stability of thermal power plant. This paper focuses on analyzing the relationship between out power and frequency of auxiliary equipment. The actual operating data is the base of determining the relation between system frequency and the output of feed pump. The input of coal is determined by the output of feed pump. Simulation models considering boiler and auxiliary equipment are built by simplifying the major equipment of thermal power plants. Numerical simulation systems are developed with MATAlab. The 300MW generation unit is adopted as the case for simulation analysis to illustrate how the frequency deviation impact generator output. Numerical simulations demonstrate the effectiveness of the proposed model.

关键词： Time-frequency analysis Numerical models Coal Load modeling

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：