The branch flow based optimal power flow(OPF) problem in radianlly operated distribution networks can be exactly relazed to a second order cone programming (SOCP) model without considering transformers. However, the introdution of nonlinear transformer models will make the OPF model non-convex. This paper presents an exact linearized transformer's OLTC model to keep the OPF model convex via binary expanstion scheme and big-M method. Validity of the proposed method is verified using IEEE 33-bus test system.
@article{arxiv.1606.00941,
title = {An Exact Linearization Method for OLTC of Transformer in Branch Flow Model},
author = {Wenchuan Wu and Zhuang Tian and Boming Zhang},
journal= {arXiv preprint arXiv:1606.00941},
year = {2017}
}