一种混合型飞跨电容三电平Boost装置研制

Development of a Hybrid Flying Capacitor Three-level Boost Device

为适应“双碳”政策驱动下光伏系统朝着高电压等级、高功率密度的发展方向,设计并研制了一款易于软启动的混合型飞跨电容三电平Boost装置(HFCBC)。该拓扑使飞跨电容兼具了从光伏侧和母线侧软启动的能力,降低了过压过流风险。其次,基于状态空间平均法建立了系统小信号模型,设计了带有超前补偿的控制器。最后,搭建了250W的原理样机,验证了所提方案的合理性。

In order to adapt to the development direction of high voltage level and high power density driven by the“double carbon"”policy,a hybrid flying capacitor three-level Boost device(HFCBC)which is easy to soft start is designed and developed.This topology enables the flying capacitor to have the ability of soft start from PV side and bus side,and reduces the risk of overvoltage and overcurrent.Secondly,the small signal model of the system is established based on the state space average method,and the controller with lead compensation is designed.Finally,a 250 W prototype is built to verify the rationality of the proposed scheme.