“…The principle of applying reactive power control to stabilize grid voltage is discussed in [8]. In a grid situation, one can formulate the voltage stability problem via control of reactive power Q as a non-linear, non-covex, optimal power-flow (OPF) optimization problem [4], [9] minimizing the overall line losses [1]. Various techniques have been proposed in the literature to solve the OPF [4], [10], [11].…”