  Full AC power flow model is an accurate mathematical model for representing
the physical power systems. In practice, however, the utilization of this model
is limited due to the computational complexity associated with its nonlinear
and nonconvexity characteristics. An alternative linearized DC power flow model
is widely used in the power system operation and planning tools. However, when
reactive power and voltage magnitude are of concern, DC power flow model will
be useless. Therefore, a linearized AC (LAC) power flow model is needed to
address this issue. This paper first introduces a regular LAC model.
Subsequently, with the advance in regression analysis technique, a data driven
linearized AC (DLAC) model is proposed to improve the regular LAC model.
Numerical simulations conducted on the Tennessee Valley Authority (TVA) system
demonstrate the performance and effectiveness of the proposed DLAC model.
