新型CL-LLC串并联直流变换器控制研究

Research on Control of New CL-LLC Parallel and Series Connection DC Converter

为实现低压超级电容和高压直流母线的快速充放电接口,提出了低压侧并联桥臂和高压侧串联桥臂的新型CL-LLC串并联直流变换器拓扑结构,并釆用占空比固定,斩波频率可调的电压-电流双闭环控制策略实现了直流变换器的控制,同时根据主要参数设计选择实现直流增益的优化,通过多机并联实现了大功率场合的应用。最后搭建了样机测试平台,实验结果验证了理论和分析的正确性。

In order to realize the fast charging and discharging interface of the low voltage ultra capacitor and high voltage direct current bus, the series parallel CL-LLC type is designed with low voltage side parallel and high voltage side series bridge arms. The direct current converter control is realized by the double closed -loop control strategy with the duty ratio fixed, the chopper frequency is adjustable of voltage and current.The direct current gain is optimized according to the main parameters, complete machine parallel which satisfies the application of the high-power situa? tion.Finally, a test platform is built, and the experimental results verify the correctness of the theory and analysis.