Abstract:
For grid power flow control, a single-stage ac-ac converter with controllable phase and amplitude (ACCPA) can simultaneously regulate output voltage phase and amplitude with respect to input voltage. Single-stage ACCPA can be connected to high-voltage grid and has a three-phase input transformer, three single-phase buck-type ac units, a three-phase output filter, and a three-phase output transformer. Single-stage ACCPA has a simpler topology, fewer switches, and a single-stage conversion circuit. Cascaded and model ACCPA have two-stage circuit structures. The capacitors of the three-phase output filter are connected triangularly to cancel third harmonic voltage and produce fundamental voltages. Single-stage ACCPA’s output voltage phase and amplitude can be independently controlled by three duty ratio control parameters. Different input and output transformer connection groups yield a family of single-stage ACCPA with different regulation ranges. A prototype was created after analyzing single-stage ACCPA’s operation. Experimental results matched theoretical analysis.
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