Control methodologies for energy storage systems to support voltage in distribution grids with photovoltaic insertion

Abstract

With the growth of distributed generation in distribution systems, problems related to voltage levels start to appear in the grid. In this context, this paper analyzes different techniques for voltage regulation of a distribution system with a high level of photovoltaic penetration (PV). The strategy is to use a battery energy storage system (BESS) in parallel to the PV generation point to promote power support to the grid, and to control the voltage level of the system. Two control strategies will be investigated. The first one controls the system voltage by adjusting the power flowing directly through the BESS. The second one provides voltage support by controlling the resulting power flowing between the PV generation and the BESS to the grid. The contribution of this paper is the comparison between these two methodologies in voltage regulation. These analyses were done through the Simulink/Matlab software using the Cigré 18 Bus Distribution system.