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Extensive numerical testing of a second-order OPF solution method was conducted using a 1500 bus network under various loading conditions. The results show that (i) properly implemented second-order OPF solution methods are robust with respect to different starting points, (ii) the decoupled OPF solution is expected t o be close to the full OPF solution, and (iii) the effects of discretization of load tap changing (LTC) transformer taps are very small and usually negligible.

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