Analysis and suppression strategy of parallel improved VSG power circulation
An improved virtual synchronous generator(VSG)control strategy for multi-inverter parallel system is proposed in this paper to suppress the circulating current caused by the impedance difference of transmission lines between PV microgrid inverters in islanded mode.Firstly,based on the traditional VSG control block diagram,each inverter counteracts the power loss on the transmission line by introducing the line power feedback,so as to improve the active and reactive power sharing accuracy,reduce the output voltage drop,and improve power quality.Then,the synchronous controller is introduced to reduce the instantaneous current and suppress the instantaneous circulating current between the multi-inverter parallel system.Finally,the effectiveness of the proposed control strategy is verified by simulation and experiment.
island modemulti-inverter parallel systemvirtual synchronous generatorcirculation suppression
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