Power flow calculation for building including PV generation system

Abstract

Power flow calculation for buildings is critical to their design, operation, and maintenance. This is because the load's power demands and the power flow constantly change with the voltage and frequency of the power system, depending on the conditions and the system's operating characteristics. When designing the electrical system of buildings, it is often designed to have a solar rooftop generation system to reduce the purchase of energy. The electrical power supplied to the building by the solar system on the roof affects the existing electrical system's voltage, frequency, and power flow as a function of solar radiation. Therefore, calculations using conventional design methods cannot accurately calculate the system's power flow and operating points. This paper presents the power flow calculation in buildings with solar rooftop generation systems using backward/forward sweep methods. In this study, the electrical distribution system of a 10-story classroom building was used as a model for the calculations with a 1- minute resolution of solar radiation. The study results show that the proposed method can accurately calculate power flow and loss in buildings with solar rooftop power generation.