中文摘要：

本文重点研究新能源发电系统用双向DC-DC变换器及其控制策略,提出一种多相耦合交错型磁集成Buck-Boost变换器应用于新能源发电系统中储能系统能量双向传递。首先对多相磁集成双向DC-DC变换器进行耦合电感研究,分析两相耦合Buck变换器等效电感并给出电感耦合设计准则;针对电感耦合交错型变换器的多开关状态、高阶化及电感电容复杂扰动的特点提出一种平均值电路法建立其小信号模型,并推导出状态变量到控制变量的传递函数;根据变换器开环稳态特性,进行补偿网络设计,提出基于趋近律的自适应电流控制策略并设计基于电流环补偿控制器。最后通过仿真和实验表明,本文提出的控制方法较传统PI控制可同时改善系统稳态及暂态性能。

英文摘要：

The paper studies mainly a bi-directional DC-DC converter used in new energy power generation system and its control strategy,and presents a magnetic-integrated Buck-Boost converter to be used in bi-directional energy transformer in the energy storage system. Firstly,the coupled inductance is studied for the DC-DC converter and the equivalent inductance of the Buck converter is analyzed,and the design principle of the inductance coupling is given. The results of the experiment and simulation show that the average current control strategy can improve the steady state performance and dynamic characteristics of the system as compared with the traditional control mode.The design of integration of magnetic coupling inductor is adopted to decrease the output current ripple and improve the system steady state characteristics.