Accuracy and Application Scope Analysis for Linearized Branch Flow Model in Radial Distribution Systems

TL;DR

This paper analyzes the linearized branch flow model's accuracy and scope in radial distribution systems, highlighting its high voltage accuracy, limitations in branch flow, and potential for fast large-scale system evaluation.

Contribution

It introduces an improved LBF model considering current injection and impedance, and compares its performance with existing models to evaluate its accuracy and application scope.

Findings

LBF model has high accuracy in voltage magnitude estimation.

LBF performs poorly in branch flow accuracy.

LBF outperforms FDLPF in large-scale system evaluation.

Abstract

An in-depth analysis of linearized branch flow (LBF) model considering current injection and absolute value of impedance is proposed in this paper. The form of LBF model is based on two equations: the current injection to meet KCL and the voltage drop to meet KVL. By representing the absolute value of complex load power with the current injection, LBF model is much simpler than alternating current power flow (ACPF) model. The results on theoretical analysis and numerical studies show that LBF exhibits the high accuracy in bus voltage magnitude but a poor performance in branch flow. Moreover, LBF is also compared with fast decoupled linearized power flow (FDLPF) model to verify its efficiency, thus proving its superiority for fast evaluation of large-scale distribution systems with high accuracy in voltage magnitude. Finally, this paper analyzes three factors to lower LBF's errors of branch flow, as well as LBF's possible application scope.