Virtual Synchronous Generator Control Based On Cascaded H-bridge Inverter

With the rapid increase in the single machine capacity of new energy distributed generation systems, in order to ensure transmission efficiency, the transmission voltage also needs to be correspondingly increased. In medium voltage high-power topology structures, cascaded H-bridges are widely used due to their unique advantages. Meanwhile, as the proportion of distributed generation increases, the power system gradually presents a "dual high" characteristic. In order to improve the stability of the "dual high" system, it is required that the distributed generation system has a certain frequency support characteristic. Therefore, this article proposes a cascaded H-bridge structure grid connected inverter based on virtual synchronous machine control to meet the development requirements of medium voltage high-power grid connected systems. And analyze the system stability analysis based on this control method and solve the DC side voltage balance problem based on the cascaded H-bridge structure. Finally, the effectiveness of the analysis method was verified through Simulink simulation.