检索结果-内蒙古大学图书馆

6th International Conference on Renewable power Generation

作者： Ning, Wei Wu, Xi Guan, Ya Jing Chen, Fan School of Electrical Engineering Southeast University Nanjing210096 China Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment Nanjing210096 China State Grid Anhui Electric Power Research Institute Hefei230022 China

This study proposes a novel method that can mitigate sub-synchronous oscillation in the wind farm by adding virtual impedance controller to the rotor side converter (RSC) of doubly-fed induction generator (DFIG). Firstly, the transfer function of RSC is obtained, taking into account the structure of outer voltage loop in RSC and virtual impedance controller. Then, the design procedure of virtual impedance controller is converted into an optimisation problem for maximising the absolute phase of this transfer function at the resonance frequency. Also genetic algorithm is utiliesd to obtain the optimal parameters of controller. Both the frequency-domain analysis of this transfer function and time-domain simulation have validated the effectiveness of this optimal parameters, and the superiority of virtual impedance controller is compared with virtual resistance controller finally. © 2017 Institution of Engineering and technology. All rights reserved.

关键词： Controllers

来源：评论

学校读者我要写书评

暂无评论

Inductance-Emulating Control for DFIG-Based Wind Turbine to Ride-Through grid Faults

Inductance-Emulating Control for DFIG-Based Wind Turbine to ...

引用

作者： Zhu, Donghai Zou, Xudong Deng, Lu Huang, Qingjun Zhou, Shiying Kang, Yong StateKey Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Wuhan NARI Limited Liability Company of State Grid Electric Power Research Institute Wuhan430074 China State Key Lab. of Disaster Prev. and Reduction for Pwr. Grid Transmission and Distribution Equipment Changsha410129 China

For doubly fed induction generator (DFIG)-based wind turbines, the rotor side of DFIG is prone to suffering from overcurrent during grid faults, due to large electromotive force (EMF) induced in the rotor circuit. To solve this problem, this paper proposes an inductance-emulating control strategy for DFIG-based wind turbine to suppress the postfault rotor current, thereby enhancing its low-voltage ride through capability. Under the proposed control strategy, once the grid fault is detected, the rotor side converter (RSC) is controlled to emulate an inductance. Furthermore, with proper inductance value, both the required rotor voltage and postfault rotor current can be reduced within the permissible ranges of RSC, thus the controllability of control system can be maintained during transient process. Moreover, the oscillation of electromagnetic torque can be effectively suppressed during transient state of both grid fault and fault recovery. Finally, the simulation and experimental results are presented to demonstrate the effectiveness of the proposed method. © 1986-2012 IEEE.

关键词： Wind turbines

来源：评论

学校读者我要写书评

暂无评论

Shell circulating current and transient ground potential rise in 220 kV GIS

Shell circulating current and transient ground potential ris...

引用

6th International Conference on Renewable power Generation

作者： Chen, Taiyu Liu, Hongshun Hu, Dongyang Liu, Xinghua Xu, Tianxi Yang, Xiaoshuai Ji, Liang Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment School of Electrical Engineering Shandong University Jinan250061 China State Grid Zibo Electric Power Company Zibo255000 China State Grid Shandong Electric Power Company Jinan250061 China Shanghai University of Electric Power Shanghai200090 China

In recent years, gas-insulated switchgear (GIS) become more and more important in the power grid. The distance between GIS shell and its internal conductor is short, which cause a strong electromagnetic coupling between these two parts. A travelling wave will occurred when the GIS isolating switch and circuit breakers are closed or broken down, which will cause a high-frequency oscillation electrical signal called very fast transient voltage, and finally lead to GIS shell circulating current and transient ground potential rise (TGPR). The principle of partial electric equivalent circuit (PEEC) method is briefly introduced here, and an equivalent circuit of GIS metal shell, bus conductor, and grounding grid is built according to the PEEC method. Based on the model of GIS shell and grounding circulating current, the theoretical calculations of the shell and grounding circulating current are taken by using the ATP-EMTP simulation software. According to the result, the possible influencing factors of shell circulating current and TGPR are analysed, and some reasonable control measures are proposed. © 2017 Institution of Engineering and technology. All rights reserved.

关键词： Electric grounding

来源：评论

学校读者我要写书评

暂无评论

Research on a detection algorithm for abnormal state of load 3

Research on a detection algorithm for abnormal state of load

引用

3rd International Conference on Mechanical, Electronic and Information technology Engineering, ICMITE 2017

作者： Yu, Dan Wang, Yubo Du, Jun Liu, Lizong Tian, Haojie Guan, Yan Li, Shengfang State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing100192 China Beijing Engineering Research Center of High-reliability IC with Power Industrial Grade Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing100192 China State Grid Liaoning Electric Power Supply Co. Ltd Liaoning110006 China

This paper describes the development status and main problems of load monitoring, introduces the key technologies of load monitoring, and by using a load state monitoring system, emphatically illustrates a detection algorithm for abnormal state of the secondary load of the current transformer on the three-phase line of the power grid. The algorithm mainly achieves the real-time detection of abnormal state such as disconnection, short connection and series connected semiconductor. In the light of this algorithm, the working principle is explained, the model formula is worked out, and the state criterion is given. The load condition monitoring system is debugged, put into operation and tested in the pilot operation, and the results show that the algorithm has a good effect. © The Authors, published by EDP Sciences, 2017.

关键词： Electric power transmission networks

来源：评论

学校读者我要写书评

暂无评论

Research on the Method to Measuring Tower Grounding Resistance by Distributing Multi Electrodes around Local Area

引用

IOP Conference Series: Earth and Environmental Science 2019年第2期242卷

作者： Honghe Huang Pinggang Ding Guohua Liu Lan Yi Chengfeng Gao Lijun Hu Zhanlong Zhang Quzhou Power Supply Company State Grid Zhejiang Electric Power Co. Ltd Quzhou Zhejiang 324000 China Quzhou Bright Power engineering Co. Ltd. Quzhou Zhejiang 324000 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Shapingba Chongqing 400030 China

The traditional methods of measuring grounding resistance need larger current lead length and long electrodes distribution distance, which brings difficulties to the measurement of tower grounding resistance in mountainous area and dense urban area. The long electrode distribution distance also consumes more manpower and material resources, and increases the economic cost of grounding resistance measurement. In order to reduce the workload of the staff, a new method of measuring tower grounding resistance is needed, which can measure the tower grounding resistance in real-time and short distance. Based on the distribution characteristics of discharge current inside and outside the tower foundation, a new method for measuring tower grounding resistance in local area of the tower foundation is proposed in this paper. This method reflects the actual discharge current to the greatest extent during the measurement process, thus reducing the influence of current distortion in the measurement and improving the accuracy of tower grounding resistance measurement under the condition of distributing electrodes in short distance.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Research on Discharge Current Distribution inside and outside the Foundation of transmission Tower

引用

IOP Conference Series: Earth and Environmental Science 2019年第6期237卷

作者： Honghe Huang Pinggang Ding Guohua Liu Lan Yi Chengfeng Gao Jingguo Mao Zhanlong Zhang Quzhou Power Supply Company State Grid Zhejiang Electric Power Co. Ltd Quzhou Zhejiang 324000 China Quzhou Bright Power engineering Co. Ltd. Quzhou Zhejiang 324000 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Shapingba Chongqing 400030 China

It is necessary to inject test current into the tower grounding electrode and distribute multiple back-flow current electrodes inside or outside the tower foundation to form a current loop when measuring the grounding resistance of the tower by Multi-Electrode Method. The distribution of the injection current inside and outside the foundation of transmission tower will be different due to the conducting function of the grounding electrode of the transmission tower by this method, which will lead to the difference among the current of back-flow electrodes and then directly reduce the accuracy of grounding resistance measurement of the tower. In this paper, the distribution of the discharge current inside and outside the transmission tower under different soil conductivity is analysed, and the influence of soil conductivity on the distribution of the spillage current is obtained. This analysis provides a research basis for measuring the grounding resistance by Multi-Electrode Method in transmission tower.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A secure communication framework based on chaotic system array and its application in Internet of Energy

A secure communication framework based on chaotic system arr...

引用

2017 IEEE Conference on Energy Internet and Energy System Integration, EI2 2017

作者： Li, Jinlong Li, Jinzhong Zhang, Shuqi Wang, Ke Zhang, Haiyang Yang, Lun Zhao, Xia High Voltage Department China Electric Power Research Institute Beijing100192 China Henan Xinyang Company State Grid Corporation of China Xinyang465400 China State Key Laboratory of Power Transmission Equipment and System Security and New technology Chongqing Unversity Chongqing400044 China

ISBN: (纸本)9781538614273

Information communication technology(ICT) is the key issue of internet of energy(IoE). It's important and necessary to improve the information security statue. As chaotic signal is noise-like, unpredictable and sensitive to the variation of initial conditions and structure parameters, using chaotic system to build secure communication system is feasible and reliable. In this paper, a framework of secure communication system that is constructed with chaotic system array is proposed and analyzed. Different types of chaotic systems with unique structure parameters were used to form an array which generating chaotic signals for secure communicating. Chaotic signals in the array are partial or complete used to modulate/mask the message needed transmission. The encryption algorithm may be jointed while processing the message before emitting it, which can promote the secure communication system secure statue comparing to the conventional cryptosystems. The simulation verification of the secure communication system with plain-image show it works on a high performance. Moreover, this cryptosystem can be achieved with chips, DSP, FPGA, micro-computers and programming language. The application of secure communication system within chaotic system array in IoE is worth a further research. © 2017 IEEE.

关键词： Internet of Energy

来源：评论

学校读者我要写书评

暂无评论

A Method of Auxiliary Planning for Intelligent Substation Access System Based on Security Region

A Method of Auxiliary Planning for Intelligent Substation Ac...

引用

The 9th Asia-Pacific power and Energy Engineering Conference (APPEEC 2017)

作者： Gao Yi Songtao Zhang Chao Qin Yuan Zeng Yang Yang Yingying Liu Shengwei Li State Grid Tianjin Power Economics & Technology Research Institute Key Laboratory of Smart Grid of Ministry of Education Tianjin University

This paper presents an auxiliary planning method for intelligent substation access system based on security region. Firstly, the method of resolving the static voltage security region is proposed. Secondly, the method of constructing the optimal index of substation accession is given, which is used to describe the priority of the node into the substation. Finally, a complete set of intelligent substation access system auxiliary planning strategy is given, which takes into account the constraints of the normal operation of the grid on the voltage amplitude.

关键词： Substation the Static Security Region Optimized Index of Substation Accession

来源：评论

学校读者我要写书评

暂无评论

Practical Dynamic Security Region Based on Phase Trajectory

Practical Dynamic Security Region Based on Phase Trajectory

引用

The 9th Asia-Pacific power and Energy Engineering Conference (APPEEC 2017)

作者： Yi Gao Jiangtao Chang Chao Qin Yuan Zeng Yingying Liu Shengwei Li State Grid Tianjin Power Economics & Technology Research Institute Key Laboratory of Smart Grid of Ministry of Education Tianjin University

A fast method based on the phase trajectory to compute DSR is ***, the phase trajectory sensitivity has more linear effect than power angle sensitivity. According to the phase trajectory boundary function, controlling unstable equilibrium generators could be identified. The PDSR is finally obtained by the sensitivity analysis between the phase and generators' active power. Test results on the New England 10-genrator 39-bus system are presented and prove the effectiveness of this approach.

关键词： The Phase Trajectory Sensitivity Analysis Controlling Unstable Equilibrium Mode PDSR

来源：评论

学校读者我要写书评

暂无评论

Study on Ripple Characteristics of Uncontrolled Rectifier Circuit

Study on Ripple Characteristics of Uncontrolled Rectifier Ci...

引用

2017 2nd International Conference on advanced Materials Science and Environment Engineering(AMSEE2017)

作者： Wen-li CHEN Bei HE Ke ZHENG Zhao WU State Grid Chongqing Electric Power Research Institute State Grid Chongqing Electric Power Company State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University

The ripple in DC charging is a basic indicator of the voltage quality, which is related to the filter capacitor and external load. In this paper, the single-phase bridge rectifier circuit is used as the research object. It analyzes the generation process of ripple voltage and derives the expression of ripple voltage. And the effects of filter capacitor C, voltage U and external load R on the ripple coefficient are simulated and analyzed, as well as the spectrum distribution characteristics of the ripple.

关键词： DC charging Ripple voltage Ripple factor Ripple spectrum

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：