Control of a Three-Phase Power Converter Connected to Unbalanced Power Grid in a Non-Cartesian Oblique Frame

The article presents a new approach to positive and negative sequence current vector control of grid-connected three-phase three-wire power electronic converter operating under grid voltage imbalance conditions. concept utilizes the representation unbalanced in coordinates frame which components are constant. nonlinear trigonometric transformation two-dimensional from stationary is found online depending on reference asymmetry. presented utilization allows implementation proportional-integral terms as regulators without use resonant measured symmetrical sequences decomposition. theoretical approach, simulation results, well laboratory tests results.