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.

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