VSC Stability Analysis Considering Gain of Inertia and Grid Strength
In the context of a high proportion of renewable energy grids,the problem of low inertia of power grids has attracted much attention.The virtual inertia control strategy enables the inverter system to provide inertia support to the power grid,but it is coupled with the control link and the power grid,which has a certain impact on the stability of the system.In current application scenarios,it is difficult to balance the gain of inertia and the balance point of system stability.In order to solve this problem,firstly,according to the main circuit structure of the system and the corresponding control strategy,a grid-connected VSC state space model with virtual inertia control is established,sec-ondly,the influence of the change of key parameters of the system on the stability of the system is analyzed by us-ing the eigenroot trajectory method and the participation factor method,and finally the system is constructed in Mat-lab/Simulink and verified by simulation,which further illustrates the effectiveness of the model and the correctness of the analysis,and makes a certain contribution to the exploration of the application scenarios of VSC system with vir-tual inertia control.
virtual inertia controlsmall signal modelstability analysisparticipation factor analysis
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