Hybrid voltage and current control strategy for virtual synchronous generator under unbalanced voltage conditions

The traditional VSG strategy does not consider the negative sequence component, which will lead to current imbalance and power oscillation under unbalanced voltage. Several improved control strategies of are usable for operating voltage nowadays. These usually require a complex PLL (phase-locked loop) detect components, reference generator convert references references. This paper proposes an VSG. main contributions in threefold: (1) A hybrid by simultaneously controlling positive output is proposed, can achieve different operation demands conditions without changing original characteristics (2) decoupling method designed acquire synchronization phase information directly from branch, thereby avoiding use (phase locked loop). (3) general formulation presented oscillations or balance flexibly. correctness effectiveness verified simulation experimental results.