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This paper discusses voltage sensor-less grid synchronization and control of three-phase Voltage Source Converters under unbalanced conditions. First, it will be shown how the concept of “Virtual Flux” can be used for grid synchronization in unbalanced conditions. For this purpose, a method for separate estimation of positive and negative sequence Virtual Flux components will be reviewed and analyzed...
This paper investigates how different approaches to grid synchronization and reference frame orientation can improve the control performance of a voltage source inverter operating in a weak grid. It is first shown how voltage-sensor-less operation based on Virtual Flux allows for flexibility in how to choose the reference frame orientation of the control system. The different possible orientations...
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