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Liu H.T.,Ningxia Electrical Power Research Institute | Huang M.Y.,Ningxia Electrical Power Research Institute | Zhang Y.H.,Beijing Join Bright Digital Power Technology Co.
Advanced Materials Research

According to the deficient situation of study in merging unit performance evaluation, this paper set up a comprehensive evaluation model for merging unit performance evaluation. Introduced triangular fuzzy number and determined the index weight through certain processing conversion, and set up a scientific system of performance indicators, and then selected normal distribution as the membership function. On this basis, this paper established a hierarchical and sub-aims comprehensive evaluation model. Finally, the model was applied for evaluating a merging unit performance. The evaluation result showed that the weight was effective and the fuzzy comprehensive evaluation model was simple and reliable. © (2014) Trans Tech Publications, Switzerland. Source

Huang J.-D.,North China Electrical Power University | Zhang F.-C.,North China Electrical Power University | Zhou Q.-J.,Beijing Join Bright Digital Power Technology Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control

This paper proposes an advanced risk assessment model of cascading failures. Taking the characteristics of the line failure probability and the impact of real-time power flow into account, the model uses the method of the line segment fitting to calculate the probability of line outage. By analyzing the double impact of cascading failures both on the supply side and the electricity users, the paper uses the bus low voltage, the power flow relative shift amount and the relative amount of load loss to assess the consequences of the cascading failure. The proposed algorithm recognizes the relative transmission section by the active power increase factor, and then selects the next branch failure link contained in the transmission section to avoid the whole network traversal search. Finally, the simulation of IEEE 39 bus system proves the validity of this method. Source

Li D.-Y.,Tianjin Electric Power Corporation | Fang Y.-N.,Tianjin Electric Power Corporation | Huang Y.,Tianjin Electric Power Corporation | Zhang Y.-H.,Beijing Join Bright Digital Power Technology Co. | Zhao H.-X.,North China Electrical Power University
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control

Setting calculation and value management is the core of relay profession. This paper develops an integrated setting calculation system, and introduces its design ideas. According to the disunified standard of secondary system description, it focuses on CIM model expanding of the secondary system, so as to meet the needs of "device setting" of the system, and then makes the data interactive solutions of setting system and the value list system in OMS. The system realizes the "horizontal integration and vertical through" of calculation setting and breaks the traditional limitations of stand-alone applications in the aspects of overall framework and deployment. It achieves modeling a unified whole network, sharing one network at all levels and information exchanging between systems. Source

Liu M.,Agricultural University of Hebei | Zhang Q.,Agricultural University of Hebei | Zhou Q.J.,Beijing Join Bright Digital Power Technology Co.
Applied Mechanics and Materials

The system uses C/S and B/S mixed mode. C/S client is responsible for the grid pattern, basis data and knowledge base maintenance. The application which based on B/S client is primarily responsible for billing, execution and scheduling operations ticket management. The system has been successfully applied to the power system of Henan Nanyang region. The practice has proved that the system can not only reduce the intensity of the daily work of the dispatcher, but also for the dispatcher to provide advanced means to improve scheduling safe operation and management level. © (2013) Trans Tech Publications, Switzerland. Source

Li J.-H.,North China Electrical Power University | Song W.,North China Electrical Power University | Zhou Q.-J.,Beijing Join Bright Digital Power Technology Co. | Wang X.-H.,Beijing Join Bright Digital Power Technology Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control

In order to promote setting calculation integrated work and solve the problem of "Information Island" which is caused by doing setting calculation work independently, we propose a method based on splicing of model and figure to build setting calculation data center. The modeling of primary and secondary equipments is analyzed. Three methods are used in building the data center. They are CIM based model merging method, SVG graphics interchange method and splicing of operation modes. Furthermore, the maintenance and using of this data center in future are introduced. The setting calculation data center makes the sharing of information between different grids come true. It improves the work of setting calculation, setting management and operation management. It offers solutions and new ideas for interconnected power grid integration setting calculation work. Source

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