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. The current trend of increasing Solar Photovoltaic powerplant penetration into the power system together with the reducing need and use of conventional synchronous generators will soon weaken the inertial response of the power system leading to stability issues during power system disturbances. The synchronous generators that have inherent control towards power system disturbances will have been replaced with converter interfaced sources which do not have an inherent control within themselves. In order to deal with the technical challenges of renewable energy penetration, this project focuses on improving the frequency response and voltage support in a hybrid renewable energy source integrated power system following load and generation contingency events. To achieve this, the proposed methodology is to model a Battery Energy Storage System (BESS) to contribute to the improvement in frequency response and voltage support. The efficacy of the proposed BESS control strategy is demonstrated in the Jinja Industrial 33kV network. We used the DigSilent PowerFactory Software to model the generic network and the BESS Control models. The Root Mean Square (RMS) simulation functionality to check for the validity of the model performance. The simulation results show the sufficient performance of the BESS in regulating the frequency and voltage