Low-voltage ride-through for PV systems using model predictive control approach

This paper focuses on the use of model predictive control (MPC) to control a two-stage photovoltaic (PV) system in order to accomplish new grid code standards for low-voltage ride-through (LVRT). The PV system is composed by a DC/DC boost converter at the generator-side, followed by a two-level three-phase grid-tied inverter. The PV's voltage support function through reactive power injection is examined using the mentioned control technique, and a PV power-reference tracking system is implemented during the voltage sag to avoid the activation of the overcurrent tripping mechanism. The system is modeled in Matlab/Simulink and PLECS in order to understand its operation, and to evaluate the effectiveness of the MPC proposed algorithm to fulfill LVRT requirements for PV Systems.