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Efficient Single Phase Transformer Less Inverter For Grid-Tied PVG System With Reactive Power Control

In This Project, A New High Efficiency Transformer Less Topology Is Proposed For Grid-tied PV System With Reactive Power Control. The New Topology Structure And Detail Operation Principle With Reactive Power Flow Is Described. The High Frequency Common Mode(CM) Model And The Control Of The Proposed Topology Area Analyzed. The Inherent Circuit Structure Of The Proposed Topology Does Not Lead Itself To The Reverse Recovery Issues Even When Inject Reactive Power Which Allow Utilizing MOSFET Switches To Boost The Overall Efficiency. The CM Voltage Is Kept Constant At Mid Point Of Dc Input Voltage, Results Low Leakage Current. Finally, To Validate The Proposed Topology, A 1 KW Laboratory Prototype Is Built And Tested. The Experimental Results Show That The Proposed Topology Can Inject Reactive Power Into The Utility Grid Without Any Additional Current Distortion And Leakage Current. The Maximum Efficiency And European Efficiency Of The Proposed Topology Are Measured And Found To Be 98.54% And 98.29%, Respectively.

Single-Phase Grid Connected Motor Drive System With DC-link Shunt Compensator And Small DC-link Capacitor

This Paper Proposes The DC-link Shunt Compensator(DSC) For Small DC-link Capacitor Systems. DSC Is Located On DC-node Parallel And Operates As The Voltage Source, Improving The System Performances. This Circuit Helps The Grid Current-shaping Control During Grid-connection Time, And Reduces The Flux-weakening Current By Supplying The Energy To The Motor During Grid-disconnection Time. This Project Presents A Power Control Method And The Design Guideline Of DSC. The Feasibility Of DSC Is Verified By Simulation And Experimental Results.

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