Nine Switch Multifunctional Converter Configuration for Integrating Dynamic Voltage Restorer and Solar Photovoltaic

Abstract

This paper presents a new way to integrate Dynamic Voltage Restorer (DVR) and grid-connected Photovoltaic (PV) structure using Nine Switch Converter (NSC) to mitigate voltage sag and supply power to critical voltage sensitive load. NSC configuration provides two different three-phase outputs. One output of the NSC is arranged in a series connection near the point of common coupling (PCC), and the other is arranged in a shunt connection near the load end. The series connection helps to mitigate supply voltage sag and distortion problems while the shunt output provides PV power in the connected network. A PV-fed boost converter powers the DC side of the NSC. Here the Synchronous Reference Frame (SRF) theory generates the control signals for NSC, and to track the maximum power from the PV panel, an incremental conductance algorithm (INC) is used. At different operating conditions, the validity of the proposed system is verified using MATLAB/Simulink.