The incorporation of HVDC equations in optimal power flow methods using sequential quadratic programming techniques

The author presents the formulation and solution method of an optimal power flow problem using a sequential quadratic programming technique for an AC-DC power system with one or more multiterminal DC systems. The algorithm developed has been tested on a number of sample AC-DC systems. The convergence characteristics, insofar as the number of the major iteration goes, is comparable with the Newton-Raphson approach. The economic advantage of being able to coordinate the DC system power transfers is illustrated by numerical examples based on the modified IEEE 30 and 118 bus systems.>