3 papers
math.OC2026
A Scalable Bundle Method for Exact Reformulation of SDP in Three-Phase Power Flow Feasibility
Bohang Fang, Lijun Ding, Cong Chen
Power flow feasibility assessment is computationally challenging for unbalanced three-phase distribution networks. This paper develops a vectorized semidefinite program (SDP) based…
math.OC2025
On Squared-Variable Formulations for Nonlinear Semidefinite programming
Lijun Ding, Stephen J. Wright
In optimization problems involving smooth functions and real and matrix variables, that contain matrix semidefiniteness constraints, consider the following change of variables: Rep…
math.OC2024
On Squared-Variable Formulations
Lijun Ding, Stephen J. Wright
We revisit a formulation technique for inequality constrained optimization problems that has been known for decades: the substitution of squared variables for nonnegative variables…