The influence of electrical consumers in residential buildings on the disturbance of voltage and current sinusoidality in the 0.38 kv network

Abstract

Relevance: This article highlights that the widespread use of electrical consumers with impulsive operating modes and nonlinear current-voltage characteristics in residential buildings leads to the generation of higher harmonic currents in the 0.38 kV power network, which causes distortion of the network voltage waveform. Therefore, the study focuses on current harmonics generated by residential electrical consumers and their impact on the non-sinusoidality coefficient of the 0.38 kV network voltage.

Objective: To identify electrical consumers that have the most adverse impact on the 0.38 kV power network, which are mainly impulse-type power supply units, and to investigate the current harmonics generated by residential consumers and their influence on the non-sinusoidality coefficient of the 0.38 kV network voltage.

Methods: Development of a simulation model of a 0.38 kV residential power network in Matlab Simulink, which allows for the analysis of total current distortion factor (THDI) and voltage distortion factor (THDU) in the main distribution board (MDB).

Results: It has been established that when the installed capacity of nonlinear loads exceeds that of linear loads, the voltage non-sinusoidality coefficient in the 0.38 kV network may exceed the permissible limits defined by GOST 13109-97. The obtained results can be applied to identify such cases and to develop preventive measures.