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The British Columbia Transmission Corporation was a Crown corporation in the province of British Columbia, Canada.Its mandate is to plan, build, operate and maintain B.C.'s electricity transmission system. Wikipedia.


Yan W.,Chongqing University of Technology | Wen L.,Chongqing Electric Power Research Institute | Li W.,British Columbia Transmission Corporation | Chung C.Y.,Chongqing University of Technology | And 2 more authors.
International Journal of Electrical Power and Energy Systems | Year: 2011

A decomposition-coordination interior point method (DIPM) is presented and applied to the multi-area optimal reactive power flow (ORPF) problem in this paper. In the method, the area distributed ORPF problem is first formed by introducing duplicated border variables. Then the nonlinear primal dual interior point method (IPM) is directly applied to the distributed ORPF problem in which a Newton system with border-matrix-blocks is formulated. Finally the overall ORPF problem is solved in decomposition iterations with the Newton system being decoupled. The proposed DIPM inherits the good performance of the traditional IPM with a feature appropriate for distributed calculations among multiple areas. It can be easily extended to other distributed optimization problems of power systems. Numeric results of five IEEE Test Systems are demonstrated and comparisons are made with those obtained using the traditional auxiliary problem principle (APP) method. The results show that the DIPM for the multi-area OPRF problem requires less iterations and CPU time, has better stability in convergence, and reaches better optimality compared to the traditional auxiliary problem principle method. © 2010 Elsevier Ltd. All rights reserved.


Huang M.,Chongqing University of Technology | Li W.,British Columbia Transmission Corporation | Yan W.,Chongqing University of Technology
Electric Power Systems Research | Year: 2010

A new method to estimate the parameters of a synchronous generator using the square-root unscented Kalman filter (SRUKF) is presented in the paper. A third-order model for the parameter estimation of both round rotor and salient generators is developed first and then the SRUKF method is applied to the thirdorder model to perform the joint estimation of state variables and unknown generator parameters. The simulation results on a test system demonstrated the effectiveness of the proposed method in parameter recognition of a synchronous generator. The estimation processes of generator parameters steadily converge to the estimated values whereas the estimation processes of state variables are consistent with the dynamic responses in the numerical simulations. © 2010 Published by Elsevier B.V. All rights reserved.


Wang Y.,Chongqing University | Li W.,British Columbia Transmission Corporation | Lu J.,Chongqing University
IEEE Transactions on Power Delivery | Year: 2010

As a key technology in smart grid, the wide-area measurement system (WAMS) will gradually become an important guarantee for security and stability of future power systems. This paper presents a quantified reliability evaluation method for the backbone communication network in WAMS and the overall WAMS from a hardware reliability viewpoint. The whole WAMS is modeled using a hierarchical structure. Markov modeling and state enumeration techniques are combined to perform the reliability evaluation. The WAMS in the IEEE 14bus system is used as an example to demonstrate the application of the presented method in reliability assessment of overall WAMS. © 2010 IEEE.


Xie K.,Chongqing University | Jiang Z.,Chongqing University | Li W.,British Columbia Transmission Corporation
IEEE Transactions on Energy Conversion | Year: 2012

Wind turbine power converter system (WTPCS) is a crucial device in a wind energy conversion system. This paper presents the new failure rate models and a reliability evaluation technique for the (WTPCS) considering effects of wind speeds, which can be named by the multistate probability analysis method. The case studies on the WTPCS of a 2 MW wind turbine with a permanent magnet synchronous generator are conducted using wind speed data at Lauwersoog and Valkenburg wind sites in Holland. The results indicate that reliability of the WTPCS is affected significantly by variations of wind speed and the rated wind speed of wind turbine. The effectiveness of the proposed method is demonstrated by examples. © 2011 IEEE.


Zhang P.,British Columbia Transmission Corporation | Li W.,British Columbia Transmission Corporation
IEEE Transactions on Power Systems | Year: 2010

This paper proposes a boundary analysis method for reliability and economic assessment in distribution systems. The main purpose is to deal with uncertainties of input data, especially when statistical information is unavailable or insufficient. The presented method uses interval numbers to enclose variability and incertitude in reliability and economic parameters, and provides the estimates on upper and lower bounds of reliability and economic indices. The proposed method has been applied to real-life distribution reinforcement projects. Case studies demonstrated effectiveness and efficiency of the method. © 2010 IEEE.

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