Passivity-based stability analysis of parallel single-phase inverters with hybrid reference frame control considering PLL effect

•The passivity analysis of single-phase grid-connected inverter controlled in synchronous reference frame (SRF) is presented.•The influence of multisampling, capacitor current feedback active damping (CCF-AD) and various PLLs on the passivity properties of single-phase grid-connected inverter are presented.•The passivity of inverter admittance in the high-frequency band is affected by the multisampling and the CCF-AD, and the passivity in the low-frequency band is influenced by the PLLs, using delay-based PLL and SOGI-PLL as case studies for validation.•The stability of the inverter-grid system under inductive and capacitive grid conditions is also evaluated.