This paper presents an alternative formulation of the AC-DC load flow
problem and shows that neglecting the converter transformer reactance
results not only in reduced accuracy but in less confidence in the val
idity of the solution. The formulation extends the Ong-Fudeh model by
decoupling the AC system variables from the DC system of equations to
provide an improved lad flow solution algorithm. The proposed method i
s tested and compared with other available techniques.