基于主电流控制的并联DC-DC升压变换器改进

Improved method of parallel DC-DC booster converter based on main current control

摘要:

并联DC-DC升压变换器之间的负载电流分配关系到系统可靠性。针对并联DC-DC升压变换器,提出了一种基于主电流控制的改进下垂方法。该方法利用并联DC-DC升压变换器的算法,根据下垂法的负载调节特性自适应地调整每个变换器的参考电压。与传统的下垂法不同,在所有变换器的内环控制器中使用其中一个并联变换器的电流反馈信号,以避免并联变换器控制回路的时延差异。研究结果显示,该算法保证了负载均流与下垂法的负载调节特性一致,在并联变换器参数失配的情况下对该算法进行了测试,通过Matlab/Simulink仿真验证了该算法的有效性。

Abstract:

The load current distribution between parallel DC-DC boost converters is related to the reliability of the system. An improved speed reduction method based on main current control is proposed for parallel DC-DC boost converters. The improved droop method adaptively adjusts the reference voltage of each converter according to the load regulation characteristics of the droop method by using the algorithm of parallel DC-DC booster converters. Different from the traditional droop method, the current feedback signal (main current) of one of the parallel converters is used in the inner loop controller of all the converters to avoid the difference of delay in the control loop of the parallel converter. The proposed algorithm ensures that the load regulation characteristics of the load current sharing method are consistent with that of the droop method. The proposed algorithm is tested in the case of parameter mismatch of the parallel converter, and the effectiveness of the proposed algorithm is verified by Matlab/Simulink simulation.