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Luo B.,Dalian University of Technology | Li G.,Dalian University of Technology | Cheng C.,Dalian University of Technology | Liu B.,Dalian University of Technology | And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2015

In view of the disadvantages of PSD-BPA software in text interaction between provincial and regional dispatching, such as large amount of data transmission, lack of checking mechanism, difficulty in authority management, complexity in parameter conversion, this paper proposes a management strategy for the integrated provincial and regional equipment parameters of power systems. According to an analysis of data which will be stored in a database, a complete parameter checking mechanism based on the flyweight pattern, pre-defined and self-defined formulas, typical parameters, and actual measured parameters is developed. Furthermore, depending on detailed recorded logs, strictly controlled verification and approval process, conversion between various types of parameters throughout modeling, and assigning management authority according to dispatching institutions, a unified management platform is developed for achieving refined and intelligent management of integrated provincial and regional equipment parameters. Actual application in Yunnan power grid and its 17 regional dispatching departments shows that the proposed method and platform are practical while able to greatly improve work efficiency. ©, 2015, State Grid Electric Power Research Institute Press. All right reserved.

Li B.,Yunnan Electrical Power Dispatching and Control Center | Zhai H.,Yunnan Electrical Power Dispatching and Control Center | Zhao M.,Yunnan Electrical Power Dispatching and Control Center | Shi H.,Yunnan Electrical Power Dispatching and Control Center | And 4 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2016

The sensitivity and selectivity of electronic protection relay's constant value is directly influenced by the power system zero-sequence network's stability, which is the foundation of safe and reliable operation of the relay protection. Zero sequence network topology is formed by transmission line and directly-grounding neutral point of transformer. Analysis shows that the integrated use of automatic reclosing of the transmission line and automatically switching grounding neutral point of transformer will ensure the equipment after tripping can resume the zero sequence power system networks as soon as possible. This technology is the optimal control technology of the zero sequence power system networks. In the following, it summarizes the automatic reclosing technology of transmission lines, researches the technology of automatic switching the grounding neutral point of transformer, and develops the corresponding control device. Device performance has been tested in actual operation and verification, which meets the application requirements. © 2016 Power System Protection and Control Press.

Gu X.,North China Electrical Power University | Wang D.,North China Electrical Power University | Li S.,North China Electrical Power University | Li W.,Yunnan Electrical Power Dispatching and Control Center | And 2 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2015

The extended black-start strategy during the early recovery stage after blackout provides a new way for power system restoration. In order to evaluate the aftereffect of an extended black-start scheme, through discretizing the network reconstruction process into a series of successive time steps, a multi-objective network reconstruction optimization model considering the alternation and coordination that unit restarting with load restoration during subsequent reconstruction process is established, and then a solving method combining the lexicographic optimization method with improved bacterial foraging algorithm and Dijkstra algorithm is proposed to solve the model. The units, loads and restoration paths in each time step are optimized from the perspective of the global optimum to obtain the optimal reconstruction scheme. After that, by defining a group of input and output indexes reflecting the multiple elements of reconstruction process, the relative efficiency of the subsequent reconstruction, which represents the aftereffect of the extended black-start scheme, are evaluated by using the super efficiency data envelopment analysis model. The test results on the New England 10-unit 39-bus system verified the validity and correctness of the proposed method. ©, 2015, Chinese Machine Press. All right reserved.

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