Currently,the dominant trend in new energy power supply systems is the heterogeneous inverters-paralleled system(HIPS),which is a combination of grid-following(GFL)and grid-forming(GFM)inverters.The dynamic characteri...Currently,the dominant trend in new energy power supply systems is the heterogeneous inverters-paralleled system(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 establishes an interactive admittance matrix model of HIPS,fully considers the interactive effects among different inverters,and explores the multi-dimensional resonance characteristics of HIPS by utilizing the modal analysis method.To achieve the coordinated control and oscillation suppression among different inverters,a frequency-divided compensation strategy is proposed,which divides the operation modes of HIPS into three categories,i.e.,GFM,GFL,and hybrid modes.Specifically,the frequency 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 operation 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.展开更多
基金supported by the National Natural Science Foundation of China(No.52077222)the Shandong Provincial Natural Science Foundation(No.ZR2023QE156)。
文摘Currently,the dominant trend in new energy power supply systems is the heterogeneous inverters-paralleled system(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 establishes an interactive admittance matrix model of HIPS,fully considers the interactive effects among different inverters,and explores the multi-dimensional resonance characteristics of HIPS by utilizing the modal analysis method.To achieve the coordinated control and oscillation suppression among different inverters,a frequency-divided compensation strategy is proposed,which divides the operation modes of HIPS into three categories,i.e.,GFM,GFL,and hybrid modes.Specifically,the frequency 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 operation 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.
