Power Quality and Harmonics Study of IEEE 33 Bus Test Power Distribution System Using Digsilent

Modu Abba Gana, Bukar Umar Musa and Adam Bukar

Department of Electrical and Electronics Engineering, University of Maiduguri, P.M.B 1069, Maiduguri, Nigeria

*Corresponding author: mag1898@unimaid.edu.ng, doi.org/10.55639/607.111009


A renewable or nonrenewable power source connected to power system at distribution system level is called distributed generation (DG). DGs with optimal location and size are integrated in to power system to mitigate the problems associated with centralized generation of power system, however, as a result of the power electronics devices associated with some of the DGs, the power quality of the system is jeopardized. Herein, Whale optimization algorithms was deployed for optimal sizing and siting of PV DG in an IEEE 33 Bus test system and DigSIlENT software was used to create a model of the system to study its impact on the power quality and harmonics in the system. The results showed that the power loss of the system reduces to 89kW from 120kW and voltage profile of 9 out of the 33 buses which were below the recommended tolerance of ±5% fall within the tolerance. At the initial stage, there was harmonics as a result of the types of loads on the network which in turn affects both the voltage and frequency of the system, this parameter and the total harmonics distortion and harmonics voltage content in the system were increased significantly as a result of the presence of PV DG in the system. Furthermore, the frequency deviation of 10 buses in the power system with PV DG do not satisfy the recommended tolerance of ±0.2Hz, these deviations are due to non-linear loads and power electronics devices associated with the DG. This study has confirmed that integration of PV DG in to power system affects the power quality and increase the harmonics content.


Power loss,
Voltage Profile,
Wind Power,