LVRT for Solar PV System with Grid Scale Battery Energy Storage System

Abstract

The renewable energy sources (RES) have a major problem of reliability due to their intermittent nature and inability to provide continuous power. For this reason some backup mode of energy storage system is required, which needs to be bidirectional in order to absorb the surplus power and should supply the power when in need, either in short-term or long-term. The future electricity grid is predicted to have more capacity share of renewable energy sources. This poses the concern of grid stability and reliability. As a result of the integration of more renewable energy sources such as the solar PV into the grid, the fault tolerance capability of the grid will become a major concern. When a large solar PV will be disconnected from the grid due to a fault, it may lead to grid instability, economic losses and eventually grid failure. To reduce the imbalance in the distribution system especially during the fault, this paper proposes a solution in the form of grid scale battery storage which enhances the capability of fault tolerance by absorbing the solar PV active power and injecting reactive power. All the concerned simulations have been performed using the software MATLAB/SIMULINK.