## ZBUS Formulation

ZBUS Formulation: ZBUS Formulation is given by By Inventing YBUS The sparsity of YBUS may be retained by using an efficient inversion technique and nodal impedance matrix can then be calculated directly from the factorized admittance matrix. Current Injection Method: Equation (9.33) can be written in the expanded form It immediately follows from Eq. (9.34) …