Forced oscillation suppression using extended virtual synchronous generator in a low-Inertia microgrid

Effects of forced oscillations (FOs) in well-damped power systems are relatively smaller than those of microgrids (MGs) in which the severity of the FOs may be intensified by converter interfaced generators (CIGs). According to the distinct system characteristics, the FOs in MGs will be challenging problems in future research topics. Without proper controls of the CIGs, the FOs may be exhibited extremely higher amplitude, resulting in the MG instability. Such influences will be exacerbated in a low-inertia MG, which can trigger critical frequency oscil-lation and system collapse. This paper introduces an extended virtual synchronous generator (VSG) with virtual forced components to attenuate the dynamic FO effects in the presence of a low-inertia MG. Contrastive sce-narios, i.e., periodic, combined, full sine, and high-frequency FOs are conducted to validate the performances of VSG control in both stand-alone and interconnected MG environments. Numerical results verify that the extended VSG control provides promising benefits in a low-inertia MG not only for the sake of MG stability improvement but also the further FO suppression.

Automated summary

The effects of forced oscillations (FOs) in well-damped power systems are smaller than those in microgrids (MGs) due to the intensification by converter interfaced generators (CIGs). The FOs in MGs pose challenges for future research, particularly in low-inertia MGs where they can cause system instability and collapse. This paper introduces an extended virtual synchronous generator (VSG) control with virtual forced components to mitigate the dynamic FO effects in low-inertia MGs.