Modelling of a grid connected battery energy storage system to curb intermittent solar energy issues.
Abstract
According to the Uganda vision 2040, It is estimated that Uganda will require 41,738 MW by 2040 thus increasing its electricity per capita consumption to 3,668 kWh. Furthermore, the access to the national grid must significantly increase to 80 per cent. In achieving this the government has plans to increase the solar energy up-take up to 5000MW.
Solar energy is intermittent in nature and would therefore result into unwanted variability in power generation. This would result into generation adequacy issues and other technical issues relative to parameters like voltage and frequency. With a high-level penetration of solar power plants according to the vision, these issues could bring enormous impact on the power grid performance.
This project aims to design a battery energy storage system connected to the power grid to serve as a temporal energy buffer to store energy from the generation resources and deliver to the load in the event that the solar energy is insufficient but also serve other purposes including; matching supply and demand, load leveling, voltage support, frequency regulation, non-spinning serve, etc.
We shall use the DigSilent Power Factory Software specifically the DigSilent simulation language to build the grid network, the battery and Power converter models. The Root Mean Square (RMS) simulation functionality to check for the validity of the model performance. We shall use the 33kv medium voltage distribution network to which Bufulubi solar power plant is located as our case study.