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.
关键词
光储并网/虚拟同步发电机/附加阻尼/频率振荡
Key words
photovoltaic storage connected to the grid/virtual synchronous generator/additional damping/frequency oscillations
维普
万方数据