An Extended Nonlinear Primal-Dual Interior-Point Algorithm for Reactive-Power Optimization of Large-Scale Power Systems with Discrete Control Variables

By Mingbo Liu, Shiu Kit Tso, Ying Cheng. IEEE Power Engineering Review, 2002

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Sensitivity-Based Approaches for Handling Discrete Variables in Optimal Power Flow Computations (2010, methodology): “The latter approach provides results comparable with the performances of IPM solution of OPF relaxation.”
Optimal Operation of Distribution Feeders in Smart Grids (2011, methodology): “The parameter Kni needs to be carefully selected, as discussed in [20], [21], to obtain an optimal integer solution to the NLP problem (16), plus (1)–(14) equality constraints, and inequality constraints (operational limits).”
Reactive Power and Voltage Control in Distribution Systems With Limited Switching Operations (2009, methodology): “functions, similarly to what was proposed in [11] for handling discrete variables for a different optimization problem.”
A Three-Phase Optimal Power-Flow Algorithm to Mitigate Voltage Unbalance (2013, background): “, [19]–[21]), but it was not until the following decade that OPF algorithms for DS (DSOPF) were proposed [7], [22]–[24].”