A STUDY OF AN URBAN DOMESTIC COMPOSITE LOAD MODEL SUITABLE FOR SOLAR PV AND GRID HYBRID SYSTEM

  • G. G. Kidegho, Department of Electrical and Electronic Engineering, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
  • S. Mbogho Department of Electrical and Electronic Engineering, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
  • M. C. M. C. Muriithi Department of Electrical and Electronic Engineering, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
Keywords: Load modeling, distribution system, voltage profile, urban domestic load

Abstract

In every power supply system, the load is a major component to the system voltage stability. For this reason, load
modeling is done to predict the behavior of the load. The load behavior in a power system directly affects the
voltage profile of the system. In most generation systems in a country, the urban domestic load consumes up to
30% of the total generated power. It is with this fact in mind that this paper carried out an urban domestic load
modeling to study the effects of disturbances and perturbations caused by the load to a power generation system.
In the study, a solar PV and grid hybrid system is used. An equivalent circuit of an induction motor is used as a
dynamic load together with the static domestic load to form the load model. The study uses both quantitative and
qualitative analysis methods and also explores the use of trajectory sensitivity concepts. Using load analysis
software; Excel and MATLAB the load was modeled. The domestic load used in the study is drawn from a study
case suburb; Embakasi Nyayo Estate. Preliminary results obtained indicate accurate predictions for the hybrid solar
PV and grid system. The investigations further indicate that load voltage dynamics can significantly influence the
damping of modal oscillations. Further, as the system becomes more stressed, sensitivity to parameter variations
increase significantly and this can be used to predict marginal stable behavior

Published
2019-05-14