Utilização de inversores fotovoltaicos conectados à rede para correção de fator de potência e fornecimento de reativo durante afundamentos momentâneos de tensão

This paper presents a proposal for a control strategy in three-phase photovoltaic inverters for minigeneration of energy intended for the supply of active and reactive power in transient regimes of momentary voltage sags and power factor correction in steady state. To implement these functionalities, an AVR was used to manage transient powers, a modified MPPT to shift the operating point of the converters, as well as a dynamic current saturator to ensure that the rated current of the switches of power is not exceeded. In addition, for power factor correction, a dynamic reactive power saturator was used that will make the system operate at 1 pu or supply the exact amount of reactive power demanded by the load, thus correcting its power factor to the unity. The entire system was implemented in a Matlab/Simulink computational environment to verify its behavior. The results obtained demonstrate the functional viability of the system, since improvements were observed both in the voltage in transient regime and in the power factor in steady state, in addition, the inverter operated within its nominal limits, thus respecting its maximum operating conditions.