Discrete Time Optimum Power Flow Simulation of 118 IEEE Test Bus with Intermittent Generation

Abstract

Hybrid systems between wind, solar, batteries, hydro and diesel generation have been developed in various places. The IEEE 118-bus Test System has been modified with some generation replaced by wind, solar, hydro, batteries and diesel generation to consider the complementary strengths of each source. The system is divided into 3 areas, and in each area power is generated by one or more of the renewable energy sources. Wind and solar generation provide intermittent generation, but hydro is a more reliable source of generation. In the daytime, when there is less wind, the solar panels will cover the extra load. At night, the wind turbines will be generating more power. If the solar panels and wind turbines do not create enough power, the diesel generator will automatically run to compensate for the deficiency and batteries, as storage, will help to reduce the burden of the diesel generator. Since the back-up generators are fuelled by diesel and turn on only when needed, this can actually save a lot on fuel cost. Such a situation can be modelled and simulated using a Stepwise Power Flow method created in the MatPower package and executed with MATLAB.