PV Source Inverter with Voltage Compensation for Weak Grid Based on UPQC Configuration

In this paper, the distributed generation (DG) inverter design based on unified power quality conditioner (UPQC) configuration is presented to solve the power quality problems for sensitive load under weak grid condition. The integrated DG consists of a series connection inverter and a shunt connection inverter. The series connection inverter acts as a dynamic voltage restorer (DVR) to mitigate voltage problem due to cable impedance in submarine cable and fluctuated load. The shunt connection inverter works as a back-up power source like PV system with Maximum Power Point Tracing (MPPT) when the voltage problem is seriously lower or higher than the operation standard. Battery system, as a back-up source when low irradiance condition, will be considered in this paper too. This paper describes a simple method for controlling the series connection inverter while the shunt connection operates as a back-up for sensitive load. Finally, the proposed method for integrated PV source is verified through the PSiM simulation.