中文摘要：

在光伏发电微电网中,直流双向变换器作为储能电池和直流母线之间的纽带,承担着能量管理和平衡的重要作用。提出了一种分立式缓冲型软PWM电路作为直流双向变换器,有效减少了开关损耗并能实现能量的双向流动。进行谐振元件的参数设计,运用状态空间平均法建立小信号模型,设计了补偿控制器以改善系统性能,基于PSIM软件建模与仿真,分析系统不同模式下的运行状态及动态切换过程,结果表明所研究的双向变换器能实现软开关工作。

英文摘要：

This paper presents a discrete buffer soft PWM circuit as the bi-directional DC converter which can realize two-way flow of power and reduce switching losses effectively.The parameters design of resonant elements is conducted,the small-signal model is built by State-space averaging method,the compensating controller is designed to improve the steady and dynamic performance of the system.