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Fan S.,Shandong University of Science and Technology | Xu B.,Shandong University of Technology | Xu B.,Kehui Power Automation Co. | Zhang Q.,Shandong University of Technology
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

A new method for fault line selection in distribution system with arc suppression coil grounding with square-wave signal injection is proposed. A low frequency square-wave signal is injected from the secondary side of bus voltage transformer, the phase currents flowing through each feeder are detected, and then the relationships of the amplitudes of their fundamental and the third harmonic components are analyzed to select the fault line. The principle of the method is introduced in detail, and the criterion of fault line selection is proposed as well. The analogical test results show that the method has good ability to eliminate the influence of distributed capacitance and the detection accuracy is improved with large grounding resistance. © 2012 State Grid Electric Power Research Institute Press.


Han G.,Shandong University | Xu B.,Shandong University of Technology | Xu B.,Kehui Power Automation Co. | Zhang H.,Kehui Power Automation Co.
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2011

It is proposed to apply IEC61850 in ADA(Advanced Distribution Automation) for the communication between master station and terminal and between terminals to access enormous terminals in plug-and-play mode. Hierarchical structure is adopted in ADA: master level, circuit level, terminal level and process level. The application of IEC61850's equipment model, logical node and information exchange model in ADA is analyzed and the information model of pole-mounted feeder terminal unit is established. IEC61850 service mapping is analyzed and IEC60870-5-101/104 mapping is considered more suitable for ADA. It is pointed out that the application of IEC61850 in ADA will promote the interoperability of distribution terminals.


Han G.,Shandong University | Xu B.,Shandong University of Technology | Xu B.,Kehui Power Automation Co.
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2011

Based on the analysis of distribution terminal functions, the FTU information model and TTU information models are built with the modeling methods, techniques, data models and logic nodes supplied by IEC61850 to realize the plug-and-play of distribution terminal. The communications between distribution terminal and master station and between distribution terminals are analyzed, the applicable IEC61850 information exchange model is presented, and the mapping of client/server model to MMS or to IEC60870-5-101/104 is introduced.


Han G.-Z.,Xi'an Jiaotong University | Han G.-Z.,Shandong Polytechnic University | Xu B.-Y.,Shandong University of Technology | Xu B.-Y.,Kehui Power Automation Co. | And 3 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013

To reduce the debugging and maintenance work of a large number of field automation terminal units accessing to distribution automation, an open, plug and play terminal unit supporting communication architecture is proposed. The use of IEC 61850 logical nodes to distribution automation is analyzed. As an example, the device information model of pole-mounted feeder terminal unit (FTU) is established. A new mapping profile (Web Services + IEC 60870-5-104) suitable for distribution automation is proposed. In this mapping profile, Web Services is used for information model exchanging and IEC 60870-5-104 is used for real-time data transferring. A prototype system is developed. The system demonstrates that the seamless communication supporting plug and play between the master station and FTU can be realized using the proposed modeling and mapping methods.


Han G.,Shandong University | Xu B.,Shandong University of Technology | Xu B.,Kehui Power Automation Co.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

A layered IP network scheme for distribution automation(DA) is proposed based on an analysis of the demand of the DA communication system. The entire network is divided into the backbone network and the branch network. The former connects the master station in control center with the DA gateway in transformer substation while the latter connects the gateway with the distribution terminal. The performance and data traffic of DA IP network are analyzed and it is shown by OPNET simulation and actual application that the IP network can fully meet the requirements of DA. © 2011 State Grid Electric Power Research Institute Press.


Han G.,Shandong University | Xu B.,Shandong University of Technology | Xu B.,Kehui Power Automation Co.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

Information modeling for line selection device and section locating device of single-phase earthing-fault is done based on IEC 61850 and object oriented method. The logical nodes of line selection and section locating of earthing-fault based on transient fault signals are defined. Using these logical nodes, the device models for fault line selection and feeder terminal unit (FTU) with fault section locating function are developed. The methods to obtain transient signals of zero sequence voltage and current are analyzed. © 2011 State Grid Electric Power Research Institute Press.


Xu B.,Shandong University of Technology | Xu B.,Kehui Power Automation Co. | Li T.,Fujian Power Company | Li T.,North University of China
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

Various existing definitions on distribution automation (DA) are introduced. The suggested DA definition comprises distribution operation automation and management automation. The role of DA in improving reliability and its economic benefits are discussed. It is pointed out that DA investment is justified only when customer outage cost is taken into consideration. The Application of DA is presented. Suggestions on the solution of key DA technologies and DA system planning are given. ©2010 State Grid Electric Power Research Institute Press.


Li T.,North China Electrical Power University | Li T.,Fujian Electric Power Company | Xu B.,Shandong University of Technology | Xu B.,Kehui Power Automation Co.
2010 China International Conference on Electricity Distribution, CICED 2010 | Year: 2010

The basic concepts of the self-healing of the smart distribution grid are introduced. The major fault self-healing technologies of the smart distribution grid are presented. Suggestions on the research and application of self-healing technologies of smart distribution gird are given. © 2010 Chinese Soc for Elec Eng.


Li T.-Y.,North China Electrical Power University | Li T.-Y.,Fujian Electric Power Company | Xu B.-Y.,Shandong University of Technology | Xu B.-Y.,Kehui Power Automation Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

The basic self-healing concepts of smart distribution grid (SDG) are introduced and its self-healing functions and relevant technology are illustrated. Two indexes for benchmarking the self-healing ability of SDG, self-healing speed and self-healing rate are proposed. The self-healing speed is divided as milliseconds, cycles, minutes and seconds levels. The self-healing rate is defined as the number of customers recovered from a fault divided by the total number of customers affected by a fault. Suggestions on the loss analysis of short-time outage and the application of SDG self-healing technologies in China are presented.


Dong Y.,Shandong University | Sun T.,Shandong University | Xu B.,Shandong University of Technology | Xu B.,Kehui Power Automation Co.
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2012

The synchronization of electronic instrument transformer data is introduced and the synchronization algorithms based on linear interpolation and quadratic interpolation are analyzed, which shows that, the linear interpolation algorithm has large error when the order of harmonic is high and the quadratic interpolation algorithm has no obvious improvement when the sampling frequency is low. The synchronization algorithm based on cubic spline interpolation is presented with simulation and error analysis, which shows that its error is lower by at least two orders than that of linear interpolation algorithm or quadratic interpolation algorithm. Digital simulation shows that, the maximum steady-state sampling error is about 0.00038% and the transient sampling error is about 0.005% of the maximum input current amplitude when the sampling frequency is 48 points per period. The proposed algorithm has lower relative error, suitable for measuring the harmonics and fundamental of secondary devices, and higher accuracy, meeting the requirements for electronic instrument transformer errors stipulated in IEC60044 standard, i. e. the steady-state accuracy class 0.2 and the maximum instantaneous transient component within ±1%.

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