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Reactive Power Control For Single Phase Grid Inverters Using Quasi Sinusoidal Waveform

A Control Technique For Grid-tie Inverters, Especially Unfolding Inverters Is Proposed. The Delivered Grid Current Is Modified To The Proposed Quasi Sinusoidal Waveform (QSW) To Carry Reactive Power, And Thus Satisfying The Pf Regulations. The Modified Current Keeps The Same Zero Crossing Points As The Grid Voltage. The Control Technique Allows Reactive Power Injection To Unfolding Topologies, Which Were Limited To Unity Power Factor Operation. The Idea Was To Provide A Quasi Sinusoidal Waveform As A Grid Current Reference To Inject Reactive Power. The Mathematical Models Were Provided And Explained. A Prototype Of A Unipolar Switching Full-bridge Inverter Was Built And Evaluated For The QSW Technique.

Maximum Boost Control Of Diode-Assisted Buck Boost Voltage Source Inverter With Minimum Switching Frequency

A New PWM Strategy To Achieve The Instantaneous Maximum Utilization Of Intermediate Dc-link Voltage, As Well As To Reduce The Switching Frequency Of Power Devices In Diode-assisted Buck–boost VSI. It Extends Voltage Gain And Avoids Extreme Boost Duty Ratio By Introducing A Switch-capacitor Based High Step-up Dc–dc Circuit Between The Dc Source And Inverter Bridge. The Diodes Are Naturally Conducting To Perform Capacitive Charging In Parallel And Discharging In Series To Achieve High Voltage Gain. It Regulates The Average Value Of Intermediate Dc-link Voltage In One Switching Time Period Ts The Same As The Instantaneous Maximum Value Of Three-phase Line Voltage By Controlling The Front Boost Circuit. It Regulates The Average Value Of Intermediate Dc-link Voltage In One Switching Time Period (Ts) The Same As The Instantaneous Maximum Value Of Three-phase Line Voltage By Controlling The Front Boost Circuit.

A Novel Nine-Level Inverter Employing One Voltage Source And Reduced Components As High-Frequency AC Power Source

In This Project, A Nine-level Inverter Employing Only One Input Source And Fewer Components Is Proposed For HFAC PDS. It Makes Full Use Of The Conversion Of Series And Parallel Connections Of One Voltage Source And Two Capacitors To Realize Nine Output Levels, Thus Lower THD Can Be Obtained Without HFM Methods. The Voltage Stress On Power Devices Is Relatively Relieved, Which Has Broadened Its Range Of Applications As Well. Moreover, The Proposed Nine-level Inverter Is Equipped With The Inherent Self-voltage Balancing Ability, Thus The Modulation Algorithm Gets Simplified. The Circuit Structure, Modulation Method, Capacitor Calculation, Loss Analysis, And Performance Comparisons Are Presented In This Paper, And All The Superior Performances Of The Proposed Nine-level Inverter Are Verified By Simulation And Experimental Prototypes With Rated Output Power Of 200 W. The Accordance Of Theoretical Analysis, Simulation, And Experimental Results Confirms The Feasibility Of Proposed Nine-level Inverter

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