Power control of three phase single stage grid connected photovoltaic system

This paper concentrates on the control of power flow in single stage photovoltaic energy conversion system. The conversion structure has a twofold requirement that consists in ensuring that the current injected to both load and grid obeys to the grid connection standards and sets the DC bus voltage similar to the reference voltage given by the MPPT algorithm. The advanced functions that can be added to the grid connected inverter are compensation for reactive power requirements and the cancelation of the harmonics created by the nonlinear loads connected to the point of common coupling (PCC). Different scenarios of condition climate and load profile have been considered as a reference to define exemplary realistic power control schemes, to quantify through load flow simulation analysis the capability required to the PV inverters in order to follow the desired control function. Simulation results using MATLAB/Simulink environment are carried out to approve the validity and the ability of the proposed method to accomplish the operation recommendations of the grid connected PV system.