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Yu A.W.,Center China Grid Company Ltd | Tang W.,Center China Grid Company Ltd | Feng B.C.,Beijing Kedong Electrical Power Control System Co.
Advances in Power and Energy Engineering - Proceedings of the 8th Asia-Pacific Power and Energy Engineering Conference, APPEEC 2016 | Year: 2016

500 kV common-tower double-circuit transmission lines have a close distance between conductors and strong coupling. When faults occur in the transmission line, the sound phase has an electromagnetic-induced voltage compared with the fault phase. This paper proposes an induced voltage-based analytic strategy on the master station for the one-line tripping out of 500 kV common-tower double-circuit transmission lines. The fault property, the fault phases, the position of failure points and whether the fault has been removed can be decided based on our strategy. It can provide a reliable basis for the forced line charging. © 2016 Taylor & Francis Group, London. Source

Ziming G.,Beijing Electric Power Company | Songnan L.-I.,Dalian University of Technology | Zeping G.,Beijing Kedong Electrical Power Control System Co.
Information Technology Journal | Year: 2014

In order to better meet the requirements of automatic voltage control, this study proposes a constraint-based clustering method for power grid soft partitioning. By pre-setting boundary conditions into the clustering algorithm, this method solves the problems that exist in the traditional method, in which one needs to artificially determine the number of partitions and a whole partition contains isolated bus only. Next, the study proposes a method to further improve the partition result by regulating the few unreasonable buses. Then, this study proposes a partition result evaluating method based on electrical gravitation. This evaluating method provides a reliable basis for verifying whether the boundary conditions are reasonable and distinguishing the merits of different partitioning methods. At last, the partition result of this study method is compared with the existing method. The comparison results show that this study method can better meet the requirement of automatic voltage control. © 2014 Asian Network for Scientific Information Source

Chen H.,University of Science and Technology Beijing | Fu Z.,Harbin Institute of Technology | Shang X.,Beijing Kedong Electrical Power Control System Co. | Ye F.,Beijing Kedong Electrical Power Control System Co.
Sensors and Transducers | Year: 2013

Network survivability is the key ability of ad hoc network under all kinds of attacks, which is a foundation to the design and evaluation of wireless ad hoc network routing protocol. The definitions of network survivability are analyzed and compared. We propose a novel survivability model based on Finite State Machine (FSM) and District Time Markov Chain (DTMC) model. DTMC steady-state probabilities are theoretically deduced and computed. Performance Evaluation Process Algebra (PEPA) is used to decribe the state transition model, PEPA Eclipse Plug-in software is used to compute the steady-state probabilities. We find that the steadystate probabilities computed by PEPA software match well with the formula derivation. Experiment results show that G steady-state probability decreases with the increasing transition probability of attack state. Finally, we validate the proposed model by PEPA simulations and numerical analysis. © 2013 IFSA. Source

Zhao Z.,Tianjin University | Shi J.,Tianjin University | Yuan Q.,Beijing Kedong Electrical Power Control System Co. | Lin J.,Tongji University | And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2015

Lightning faults early warning and trip probability calculation have a positive significance for power system protection against lightning faults. A novel algorithm for calculating lightning trip probability based on lightning subareas information at three adjacent time intervals is proposed. Firstly, lightning subareas are identified based on image recognition technology according to lightning monitoring information at each time interval. Then the optimal trajectory of lightning subareas is determined by the optimization method. The lightning subareas information at current time interval, previous adjacent time interval and the trajectory of lightning subareas constitute the lightning subareas information at three adjacent time intervals, based on which the relevant information, including variations of lightning subareas characteristics (area, lightning current intensity, lightning probability of the lightning subarea) at next time interval are forecasted. Finally, the trip probability of the transmission lines within the forecasted lightning subareas are calculated. Since more lighting monitoring information is utilized, the method proposed has higher precision of lighting area forecast. Accordingly, the lines trip probability also has higher precision and could be used as the lighting warning index. The results of the samples show the validity of the proposed method. © 2015 State Grid Electric Power Research Institute Press. Source


The present invention discloses a three-dimensional man-machine interaction display and control method for power grid operation monitoring, which includes the following steps: drawing a picture in a two-dimensional plane by using a dual-buffer mechanism; reading the picture drawn in the two-dimensional plane, and drawing the picture in a three-dimensional space; detecting an interaction event in the three-dimensional space, and determining a type of a component in an operation panel; delivering the interaction event between the three-dimensional space and the two-dimensional plane, and processing the interaction event according to the component type; and reading the picture drawn by the component in the two-dimensional plane, and updating a corresponding image in the three-dimensional space. The present invention solves the problem of introducing the alarm images into the three-dimensional space.

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