LVRT control strategy for PV grid connected system based on P-V optimal slope MPPT technique

The work presented in this paper describes an improvement of a photovoltaic grid connected system based on P-V optimal slope MPPT technique. This system has a LVRT capability with reactive power injection. To achieve this improvement, no new component is added. Only the flexibility of the used MPPT technique is exploited to establish a control law which gives the system a suitable behavior when voltage sags occur. Modeling of generation system under voltage sag is performed and control law is presented. The results are validated by simulation in the Matlab-Simulink environment.