Retrofitting of Datacenters On-grid PV Systems for Peak-Hours Constant Current Injection Using Available Batteries

In this paper, a retrofitting concept for already existing on-grid photovoltaics (PV) systems under operation in datacenters is presented with focus on the control strategy modification of commercial PV inverters. The main idea is to use the already available PV inverters during the Brazilian peak-hours, from 6 pm to 9 pm, with constant power injection for time-shifting of electrical energy and ancillary services, fed by added batteries that can be new batteries or even the batteries previously applied to the datacenters UPSs, avoiding Capital Expenditure (CAPEX) and assuring that the batteries will be used until their actual end-of-life.