Dynamic Interaction Control Characteristic Analysis of Grid-following and Grid-forming Inverters
There are significant differences between the control modes of the grid-following converter and the grid-forming converter.The system stability mechanism in the interconnected scenario has not been effectively revealed.The interaction mechanism between the internal control loops in the hybrid system is analyzed to reavel the dynamic characteristic of interconnected.Firstly,the relationship between the internal control loop and the external impedance characteristics of the converter is analyzed,and the overall impedance is decomposed into the equivalent sub-impedance of the loop.Then,through sensitivity analysis,the key control loops that affect the stability of the system in different scenarios are located.Based on the analysis of the dominant loop,the interaction mechanism between the key control loops is studied.Finally,the accuracy of the results is verified through time-domain simulation.
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