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Virtual Oscillator (VO) control is the latest and promising control techniquefor grid-forming and grid-supporting inverters. VO Controllers (VOCs) providetime-domain synchronization with a connected electrical network. At the sametime, a VOC can incorporate additional nested control loops to meet thesystem-level requirements such as fault ride-through capability. However,existing VOCs have two limitations. Firstly, the existing VOCs do not havedecoupled control over individual phases. As a result, the performance of theexisting VOCs is not satisfactory in presence of unbalanced grid voltages.Secondly, the fault ride-through performance of the existing VOCs underunbalanced faults is not satisfactory. The power operation at a healthy phaseis badly affected by a faulty phase. This paper has introduced a modified VObased system-level grid-forming controller to overcome the limitationsmentioned above. Systematic development of the proposed control architecturewith analytical reasoning is presented. Simulation studies and hardwareexperiments are conducted for validation.

A New Virtual Oscillator based Grid-forming Controller with Decoupled  Control Over Individual Phases and Improved Performance of Unbalanced Fault  Ride-through