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Tao H.,National Electrical Power Dispatching and Control Center
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2015

Firstly, this paper briefly introduces the research fields, current concerns, recent activities and working groups of study committee of system operation and control (SC C2) of CIGRE 2014. The preferential subjects of SC C2 of CIGRE 2016 are also described. And then the details of discussion and the related papers of the two preferential subjects (managing new challenges in operational planning and real-time operation of electric power systems, emerging operational issues for transmission and distribution interaction) are given. Finally, a look-ahead of the development trend of system operation and control technologies and the technical issues that should be focused on is presented. ©, 2015 State Grid Electric Power Research Institute Press. Source

Liu W.,North China Electrical Power University | Zhao T.,North China Electrical Power University | Qiu W.,National Electrical Power Dispatching and Control Center | Zhang J.,North China Electrical Power University
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2013

The rapid development of renewable energy poses new challenges to the operation of the grid: wind power can not be fully used due to the lack of peak-load regulation capacity and so on. And the electric vehicle charging as controllable provides the opportunity to improve the grid operation. A two-stage control mechanism based on grid and EV users is proposed to determine the coordinated program between large-scale EV charging and wind-thermal system. At the user side, different charging strategies for different users are established to optimize EV charging. At the grid side, a dynamic environmental dispatch model including economy, emission and wind-power abandoned is proposed to optimize outputs of the thermal units. The orthogonal initialization, improved crowd distance calculation and self-adaptive parameter control are put forward due to the weakness existing in the multi-objective differential evolution. Simulations are done in a system containing 10 thermal units and large-scale wind-power system, the coordinated program is determined, and impacts of EV scale and reserve on the operation are also analyzed. Source

Liu H.,Central China Grid Company Ltd | Wang D.,National Electrical Power Dispatching and Control Center | Zhou Z.,China Electric Power Research Institute
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2016

The deficiency of traditional relay protection is analyzed, and the concept of flexible operation features of relay protection is proposed. That is, operation features are determined with a variety of criteria according to the fault characteristics of protection objects. Compared with the operation features using a single criterion for relay protection, flexible operation features are suitable for cases of indistinct fault characteristics. The application occasions of the protection flexible operation features are described, including transformer excitation inrush current identification, distance protection oscillation block open conditions, the rapidity and accuracy of high resistance grounding fault, and so on. Finally, the application prospects of the relay protection flexible operation features are previewed. © 2016 Automation of Electric Power Systems Press. Source

Xin Y.,National Electrical Power Dispatching and Control Center | Mi W.,NARI Group | Jiang G.,NARI Group | Xu D.,NARI Group | And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2013

The rapid development of power system requires that the grid models, real-time data and grid graphics information can be synchronously shared in real-time between control centers. The CIM/E standards that have overcome the drawback of low efficiency of CIM/XML and application only in offline exchange are briefly described, being capable of meeting the requirement of grid model online real-time exchange between control centers. Focus of attention is on CIM/E based grid model information integration management, realization of the application of multi-model integration management, offline and online model integration management and multi-level model integration management. Technical support is provided to dispatching business horizontal integration and vertical linkage. CIM/E as well as its associated technology has been applied to the smart grid-operation support system (SG-OSS) for solving the problem of real-time sharing of model information between multiple control centers and various professionals within control centers. © 2013 State Grid Electric Power Research Institute Press. Source

Lai X.,Tsinghua University | Zhong H.,Tsinghua University | Yang J.,National Electrical Power Dispatching and Control Center | Xia Q.,Tsinghua University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2013

A novel decomposed optimization method based on price response function is proposed for solving security constrained economic dispatch problem over large-scale power systems. In this method, provincial power systems are taken as basic optimization units, and the global optimization problem is decomposed into an upper-level master problem and provincial sub-problems. In the master problem, network reduction technique is imposed, and the dynamic price response function is trained based on the results of the sub-problems in order to optimize the power flow of inter-province tie-lines. In the sub-problems, power output of generating units is optimized with fixed tie-line export, with marginal pricing information corresponding to power loads of different time periods calculated and submitted to the upper-level. The proposed method fully exploits and utilizes the implicit pricing information in the sub-problem results of each iteration, thereby avoiding the oscillation from which the conventional method of Lagrange relaxation suffers much because of the monotony of pricing signal. Hence, the method is able to converge quickly in a few steps with good robustness and sufficient accuracy from the engineering point of view. Computational results of IEEE RTS and a large-scale real power system are presented to verify the effectiveness of the method. ©2013 State Grid Electric Power Research Institute Press. Source

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