Additional Damping Control Based on VSG and its Application in Photovoltaic Storage Grid-Connected System
When large-scale photovoltaic is connected to the system nearby,the inertia of the system will decrease as a whole,and its stability margin will be reduced after the system is disturbed,and power oscillation will occur in extreme cases.In this paper,an additional damping control strategy based on virtual synchronization is proposed and applied to photovoltaic storage grid-connected system.Firstly,a small signal model is established to analyze the damping characteristics of the system.Secondly,the additional damping control based on virtual synchronous generator is proposed in the photovoltaic storage inverter side,and the effect of additional damping control on the frequency oscillation of the system is analyzed by small signal model.Finally,the simulation model of the photovoltaic storage grid-connected system is established in the PSCAD/EMTDC environment,and compared with the traditional control strategy,the effectiveness and correctness of the proposed virtual synchronous generation control are verified.
photovoltaic storage connected to the gridvirtual synchronous generatoradditional dampingfrequency oscillations
万方数据
维普
