Analysis and Design of Hybrid Harmonic Suppression Scheme for VSG Considering Nonlinear Loads and Distorted Grid

The power quality of virtual synchronous generator (VSG) inevitably deteriorates in the presence local nonlinear loads and distorted grid. In this paper, conflict involved simultaneous elimination distortion for both inverter load voltage grid exchanged current is first described. A unified control structure presented that enables a tunable tradeoff between two constrained harmonic sources. Then, hybrid suppression scheme proposed to enable further improvement adaptability VSG, which mainly consists loop an adaptive current-controlled loop. aims scale down output impedance via negative feedback loop, while compensator intended counteract adverse effects from weak additional voltage, leads substantially lower total at same time. Small-signal modelling performed investigate system stability its robustness parameter perturbations. effectiveness methodology verified using hardware-in-the-loop simulations.