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This document describes the detailed reformulation of a power system upgradeplanning problem into a more generic quadratically constrained quadraticproblem (QCQP). The problem is one of deciding what lines to upgrade in anexisting power system in order to enable it to handle specific load situations.The reformulation presented here is based on other formulations already used inthe field, such as the ones presented in [1] and [2]. This document was createdas a reference for publications by the author that refer to the planningproblem but avoid outlining reformulation details.

A Mixed-Integer QCQP Formulation of AC Power System Upgrade Planning Problems