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High frequency circuit model of transformer windings based on frequency responses for VFTO studies

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4 Author(s)
Zhang Zhongyuan ; School of Electrical Engineering, North China Electric Power University, Baoding, Hebei Province, China ; Chen Yutong ; Liu Yupeng ; Lu Fangcheng

In order to study the effects of VFTO to transformers, the high frequency model for transformer windings must be set up. In this paper, a systematic methodology is presented for establishing the high frequency two-port circuit model of transformer windings under VFTO based on its frequency responses. The pi-equivalent circuit is constructed based on the Y-parameters transformed from the measuring S- parameters. A correction to the rational function of Y approximated by vector fitting (VF) is calculated, which enforces the real part of Y is positive definite. This enforcement can assure the passivity of the whole model, which could bring a stable simulation. The values of the synthesized RLCG elements can be easily calculated form the rational functions. This kind of pi-equivalent circuit model could do stable and exact simulation compared with the experiment results, which shows the validity of the method.

Published in:

Electric Utility Deregulation and Restructuring and Power Technologies, 2008. DRPT 2008. Third International Conference on

Date of Conference:

6-9 April 2008