Avoiding Power Clipping Losses by Inverter having High DC-to-AC Loading Ratio in Grid Connected Solar PV Plant Using Battery Energy Storage System

This paper presents a MATLAB model simulation as a solution to capture and avoid energy losses due to power clipping by Inverter having high DC to AC loading ratio in grid connected solar PV plant using voltage controlled bidirectional DC-to-DC converter interfaced with Lithium Ion battery. Battery is connected on DC link of grid connected solar PV plant. Complete topology is modeled in MATLAB®. Model uses a unidirectional DC-to-DC converter with MPPT (Maximum Power Point Tracking) for Solar PV Interface and Voltage Source Inverter to inject power into the grid from Solar PV or Battery. If the power from Solar PV is higher than the capacity of Inverter, some PV power is diverted to the battery in Buck mode of voltage controlled bidirectional DC-DC Converter. This avoids PV power clipping and loss of energy by inverter due to inverter capacity limitation. When Solar PV generation is less than Inverter capacity, power from the battery is discharged into the grid through same bidirectional DC-DC converter in Boost mode and Inverter. Model is simulated in MATLAB and results are validated.