Distributed Generation Interconnection with Improved Unified Power Quality Conditioner for Power Quality Mitigation

This paper presents the results of the integrated operation of the Improved Unified Power Quality Conditioner with distributed generation of photovoltaic (I-UPQCPV). The 1-UPQCPV supply power from the PV through the shunt inverter to the load, which result into the high Volt-Amp (VA) loading on the shunt inverter. Hence, the power angle control approach aims at the adequate utilization of series and shunt inverter by proper coordination of imaginary power sharing between the two inverters to reduce VA loading on shunt inverter. In this arrangement, DC-link is connected to the generator with the application of the rectifier. The UPQC consist of series and parallel voltage source inverter (VSI) connected back to back with the same DC-link with DG to mitigate under-voltage, overvoltage and interruption. The execution of the proposed system is tested with nonlinear loads connected system with PV solar generation. The effective operation of the system is confirmed during grid disturbance such as sag/swell and interruption. The execution of this work was performed using Matlab/Simulink. The investigation of this approach indicates that (I-UPQCPV) maintain the load voltage within the permissible limit of ±5 % during disturbance.