异构逆变器并联系统的谐振特性分析与分频补偿策略

Currently,the dominant trend in new energy pow-er supply systems is the heterogeneous inverters-paralleled sys-tem(HIPS),which is a combination of grid-following(GFL)and grid-forming(GFM)inverters.The dynamic characteristics of different inverters in HIPS and the differences between GFL and GFM inverters undoubtedly increase the difficulty of the stability analysis and coordinated control.This paper establish-es an interactive admittance matrix model of HIPS,fully consid-ers the interactive effects among different inverters,and ex-plores the multi-dimensional resonance characteristics of HIPS by utilizing the modal analysis method.To achieve the coordi-nated control and oscillation suppression among different in-verters,a frequency-divided compensation strategy is proposed,which divides the operation modes of HIPS into three catego-ries,i.e.,GFM,GFL,and hybrid modes.Specifically,the fre-quency division boundary is determined based on the resonance characteristics of GFL and GFM inverters,with the operation modes of HIPS being dynamically adjusted according to the harmonic power ratio.Finally,the simulation and experimental results demonstrate that the HIPS can flexibly adjust the opera-tion modes to adapt to the complex conditions after adopting the frequency-divided compensation strategy and suppressing the oscillation frequency ratio to less than 2％,ensuring the safe and reliable operation of HIPS.