With the transformation of the global energy structure and the improvement of environmental protection awareness,as an efficient and environmentally friendly way of energy utilization,the distributed generation system based on new energy is gradually occupying an important position in the power system. With the continuous improvement of the penetration rate of distributed generation system,the equivalent inertia of the power grid continues to decrease,which seriously affects the frequency stability of the power system.As a result,virtual synchronous control has emerged,which can compensate for inertia and equivalent damping of the grid by simulating the dynamic characteristics of traditional rotary synchronous generators. Although the small signal stability control of virtual synchronous machine ( Virtual synchronous generators,VSG ) has been widely studied,the influence of its reactive power loop on the transient stability of the large signal of the system still needs to be further studied.In this paper,the influence of the reactive circuit of the grid-connected inverter on its transient stability is analyzed theoretically,and on this basis,three methods that can effectively improve the transient stability of the grid-connected inverter are listed. Finally,the simulation was verified by MATLAB/Simulink platform.
关键词
构网型逆变器/虚拟同步机/暂态稳定性/无功控制回路
Key words
grid-Forming inverter/virtual synchronous generator/transient stability/reactive power control loop
维普
万方数据