Symmetrical multilevel inverter based TDVR for voltage quality enhancement

Abstract

This Article Presents Symmetrical Multilevel Inverter With Reduced Number Of Switches Based Transformer Less Dynamic Voltage Restorer (SMLI-TDVR) For Voltage Quality (VQ) Enhancement. Reduction Of Transformer From Conventional Voltage Restorer Leads To Increase In Size Of Passive Filters, Which Can Even Reduce By Using Presented SMLI-TDVR. Reduced Filter Size And Less Load Voltage Total Harmonic Distortion Are The Added Advantage Of SMLI-TDVR. The Control Scheme Provides Switching Pulses For Closed Loop Operation Of SMLI-TDVR To Maintain Load Voltage Constant. Real Time Implementation Of Controller Is Done By Utilizing FPGA Based Real-Time Simulator Called OP4500, A Product Of OPAL-RT. Real Time Testing Of SMLI-TDVR Is Carried Out By Power Hardware In Loop Testing Method (P-HIL). Results Of P-HIL Testing Prove That SMLI-TDVR Can Able To Compensate VQ Problems To Make Load Voltage Constant With Smooth Sinusoidal Waveform.