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3-D nonlinear transient eddy current calculation of online power transformer under DC bias
Yao, Yingying,Koh, Chang Seop,Ni, Guangzheng,Xie, Dexin IEEE 2005 IEEE transactions on magnetics Vol.41 No.5
This paper presents a new method to analyze the three-dimensional (3-D) nonlinear transient eddy currents and losses of an online transformer in a power system under direct current bias. In the method, power system simulation is incorporated with 3-D field computation to obtain the magnetic parameters and the equivalent exciting source of the online transformer.
A Global Optimization Algorithm Based on <tex> $C^{1}$</tex> Piecewise Response Surface Patches
Yingying Yao,Chang Seop Koh,Shiyou Yang,Guangzheng Ni IEEE 2007 IEEE transactions on magnetics Vol.43 No.4
<P>A new surrogate objective function is suggested for the global optimization of electromagnetic devices. The surrogate objective function is constructed using a C<SUP>1</SUP> piecewise response surface incorporated with the design sensitivities computed by using the finite-element method. The sampling data points used for constructing the response surface are adaptively inserted during the optimization process. After the surrogate objective function is constructed, the global optimum point is obtained by using a genetic algorithm. Applications to benchmark problems and the optimum design of a permanent magnet system show the effectiveness of the proposed algorithm</P>