Theneutral‐earth‐voltage(NEV) system state estimation model

Abstract

Summary Next‐generation distribution systems will be characterized by higher unbalanced currents due to increased asymmetrical currents produced by fast charging of electric vehicles and high short‐circuit currents under meshed operation. The unbalanced currents flowing through earthing impedances produce neutral‐earth voltages (NEVs) that may compromise the security (IEEE 62.92) and the safety (IEEE 80) of the system. Existing PMU‐based distribution system state estimation (PMU‐DSSE) methods described in literature are unable to estimate neutral‐earth voltages. To fulfill the research gap, this paper presents a new PMU‐DSSE formulation capable to estimate NEVs taking advantage of the OpenDSS's multiphase network model. The proposed procedure was successfully applied in two well‐known NEV test cases modeled in the OpenDSS platform.