C. Campaigne, Lipka, P. A. , Pirnia, M. , O’Neill, R. P. , and Oren, S. , “Testing step-size limits for solving the linearized current voltage AC optimal power flow”, FERC Staff Technical Paper. http://www. ferc. gov/industries/electric/indus-act/market-planning/opfpapers/acopf-9-stepsizelimits-iliv-acopf. pdf, 2013.