opf matpower

hello I'm student of electrical engeenearing.Ihave some questions about opf at matpower.at"poewer system analysis" by Johnj.grainger and WilliamD.Stevenson- i understood for computation lambda we have gencost function (Quadratic function like   C= aP^2 +bP+c) and lambda=dc/dp , and for optimal

opf matpower

hello I'm student of electrical engeenearing.Ihave some questions about opf at matpower.at"poewer system analysis" by Johnj.grainger and WilliamD.Stevenson- i understood for computation lambda we have gencost function (Quadratic function like   C= aP^2 +bP+c) and lambda=dc/dp , and