CALCULATION OF GRID ROOFTOP SOLAR POWER SYSTEM ACCORDING TO ELECTRICAL LOAD DEMAND, SIMULATION COMPARISON WITH THE CASE INCORRECTING ONE-AXIS TRACKING

Abstract

In this article, the authors calculate and simulate a grid-connected solar power system according to the household's daily (24-hour) electricity demand of 17068 Wh/day. During the day, when the load does not use all the electricity, it will be sent to the grid to sell electricity, contributing to reduce CO₂ emissions to protect the environment and electricity shortages for the national system. In the evening, the consumption load will use electricity from the grid. Calculating and simulating in September to optimize the solar power system's capacity during the day, it is necessary to install the system with a high angle to the north 12^o degrees, a low angle to the west-south -7^o degrees, the solar radiation the system receives during the day is optimally 4.7 kWh/day. When fixedly installed at the optimal angle combined with one-axis navigation, the solar panels rotate according to the solar orbit position and will yield the maximum power of 2294.7 kWh/year. The article chooses a case that combines one-axis navigation to calculate and simulate a rooftop solar power system following the solar orbit to supply electricity to households in Dong Nai, taking into account the performance of the equipment used, electricity in the system, lowest solar radiation, resulting in a reduction in greenhouse gas emissions of 936 tons of CO₂ per year or 23400 tons of CO₂ after 25 years.