Integration of PV array to three-phase grid using Power Electronic converters with de-coupled control

Abstract

The design and implementation of a power electronic converter to have independent control of active & reactive powers for integration of PV array to a three-phase utility grid are presented in this paper. The PV array is connected to the grid through a boost converter and a Voltage Source Inverter (VSI). The duty ratio of the boost converter is adjusted by using a PI controller to maintain constant dc voltage of 200V at dc link. This facilitates the connection of a resistive load at the dc link. The VSI employs dq axis control technique to independently control the active and reactive power flow to the three-phase grid. The gate pulses for the IGBTs used in boost converter and VSI are generated using dSPACE RTI 1103 controller. The hardware of the complete system is implemented with 480W PV array feeding a three-phase 110 V, 50 Hz grid. Both simulation and experimental results are furnished to demonstrate the efficacy of the developed scheme.