Test Institute

Chengdu, China

Test Institute

Chengdu, China
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Weixiong H.,Test Institute | Feng X.,Test Institute | Weilun X.,Test Institute | Zhuping X.,Test Institute | And 2 more authors.
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2014

This paper puts forward the power quality forecast and early warning mechanism. Using historical data to effectively predict the future stage of electric energy quality and providing early warning to make the power quality problem for grading analysis. Firstly, according to the characteristics and the status quo of power grid, put forward combination forecast, which based on linear regression model,gray model and random time series model, to predict the power quality in the future. Secondly, be the first to propose the power quality warning level and its process, then build the early warning mechanism of power quality. At last, the example and application analysis indicates that the power quality forecast and early warning mechanism has the strong practicality and generalization performance. © Sila Science. All rights reserve.


Feng X.,Test Institute | Weilun X.,Test Institute | Yumin X.,Test Institute | Zhiwei H.,Test Institute | And 2 more authors.
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2014

This paper proposes a competitive mechanism based on dynamic power quality evaluation method and introduces its application, which not only evaluate the indicators separately but also focus on the analysis of the relative merits between the objects. Firstly, the data of objects' power quality indicators at each time point are gained, secondly the competitive mechanism is introduced to sort the objects and get the objects' trend of ranking. Then for each indicators, different scores associated with different rankings are given to obtain the single power quality competitiveness score, combining rank correlation analysis method to obtain the power quality comprehensive competitiveness score which reflects the power quality competitiveness level of the assessment object, and ultimately achieve the comparison between objects. Finally, the realistic example analysis and evaluation according to the substation power quality data of one power supply bureau is given to achieve the comparison between the substations and prove its effectiveness. © Sila Science. All rights reserved.


Hu J.,Chongqing University | Yan B.,Chongqing University | Zhou S.,Test Institute | Zhang H.,Sichuan Electric Power Research Institute | And 2 more authors.
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2010

The aerodynamic coefficients of iced quad-bundled conductor varying with attack angle determined by wind tunnel test are presented. A cable element with torsional degree-of-degree used to simulate the iced conductor is obtained in ABAQUS software by releasing the two bending degrees-of-freedom and setting the material to be incompressible. The aerodynamic loads varying with attack angle are applied on the cable elements through the user defined element subroutine in ABAQUS. Furthermore, the effects of parameters, such as wind velocity, ice thickness, initial attack angle and span length, on the galloping of the quad-bundled conductor are numerically investigated. The result provides a theoretical foundation for the development of anti-galloping technology. ©2010 IEEE.


Hu J.,Chongqing University | Yan B.,Chongqing University | Zhou S.,Test Institute | Zhang H.,Sichuan Electric Power Research Institute
IEEE Transactions on Power Delivery | Year: 2012

The aerodynamic coefficients of each subconductor in an iced quad bundle conductor covered with crescent-shaped and sector-shaped cross-sections were determined by the wind tunnel test. A cable element with torsional degree of freedom used to simulate the iced conductor is obtained in ABAQUS software by releasing the two bending degrees of freedom and setting the material to be incompressible. The aerodynamic loads varying with the angle of attack during moving of the bundle conductor are applied on the cable elements used to discretize the iced subconductors through the user-defined element subroutine UEL in ABAQUS. The numerical method verified by two examples is employed to investigate galloping of iced quad bundle conductors at different wind speed, initial angle of attack, ice thickness, ice shape, and span length, and the results reflect the influences of these parameters on the galloping behavior of the quad bundle conductor, which is important for the development of anti-galloping technology. © 2012 IEEE.

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