Shifted Pulse Width Modulation Technique Research Articles

Dual reference phase shifted pulse width modulation technique for a N ‐level inverter based grid connected solar photovoltaic system

This study presents a control algorithm of a grid tied solar photovoltaic (PV) system using a dual reference phase shifted pulse width modulation technique for a single-phase cascaded N-level inverter. The grid tied inverter consists of several five-level hybrid inverter modules which are connected to the solar PV panels having equal DC voltage magnitudes. The proposed control technique for the multilevel inverter generate the near-sinusoidal current with near-unity power factor to the grid and balance the capacitor voltages across the DC links. The voltage and frequency of the multilevel inverter can be adjusted using closed loop control, such that, the maximum power flow to the grid can be achieved even under varying grid voltage. The performance of the complete system has been verified under different transient states. Experimental results verify the effectiveness of the proposed technique.

Improving the Power Quality by MLCI type DSTATCOM

paper proposes multilevel inverter type DSTATCOM for mitigating voltage sag at the load side. Cascaded H-bridge configuration for multilevel inverter with advanced phase shifted pulse width modulation technique is presented. Voltage sags are generated by faults the distribution feeder. First addresses with the three-phase 5-level cascaded multi level inverter and second addresses with the three-phase 7-level cascaded multi level inverter based on the shunt active power filter for mitigating the voltage disturbances. The proposed multilevel topology is simulated using MATLAB. The simulation results of the Five- level and Seven-level cascaded multilevel inverters are compared in different aspects.