Design of a Spatial Iterative Learning Controller for Single Phase Series Connected PV Module Inverter for Grid Voltage Compensation

摘要

In this paper, a new type of controller isproposed for series connected PV inverter for grid voltagecompensation. The inverter operates during the day timeas an active power compensator as well as load voltageregulator under grid voltage sag, swell or even undernormal condition. The compensating voltage provided bythe inverter is added vectorially in series with the gridvoltage in such a way that the load voltage magnitude ismaintained constant along with power control facility. Inmicro grid scenario, the grid may suffer from frequencyvariation also. The proposed Spatial ILC is able to trackthe required load voltage along with eliminating the gridharmonics. The control system ensures load voltage isauto synchronized with the grid voltage even in thecase of grid frequency variation. This control strategy issimple to implement and provides improved performanceas compared to other conventional tracking controllers.Experimental as well as simulation results presenteddemonstrate the efficacy of the proposed controller.