A COMPARISON OF LINEAR LOAD FLOW MODELS FOR 39-BUS NEW ENGLAND TRANSMISSION SYSTEM

Abstract

Power flow equations are fundamental mathematical models that serve as the foundation for planning and operating electrical systems. While traditional alternating current power flow (ACPF) methodologies yield accurate outcomes, their nonlinear characteristics, poor convergence, and low efficiency in computation restrict their applications in power systems. This paper compares two linear power flow methods for electrical grids, namely the direct current power flow (DCPF) method and the decoupled linear power flow (DLPF) method. These power flow methods are applied to the 39-bus NewEngland transmission grid to compute voltage magnitudes, voltage phase angles, and power flow on branches. The computational results indicate that the decoupled linear power flow (DLPF) method yields better results in terms of nodal voltage magnitudes and phase angles compared to the direct current power flow (DCPF) method. Nevertheless, the DLPF approach exhibits inferior performance in terms of power flow on branches when compared to the DCPF method.