基于三环移相控制的ISOP模块化电源的研究

Research on ISOP Modular Power Supply Based on Three Loop Phase Shift Control

首先分析ISOP系统的基本单元,采用隔离型双向全桥DC-DC变换器(IBDC)作为ISOP系统的基本单元,对其拓扑结构和相应的控制方法原理进行分析。随后介绍了ISOP的拓扑结构,分析其实现均压均流的条件,针对输出均流控制(OCS)各模块输入阻抗的负阻抗特性使系统无法稳定运行的问题,提出输入均压、输出均流及输出电压环三环控制策略,最后仿真验证在各模块参数不一致情况下三环移相控制的控制效果明显比传统双环移相控制好。

Firstly,the basic unit of the ISOP system is analyzed.The isolated bi-directional full bridge DC-DC converter(IBDC)is adopted as the basic unit of the ISOP system,and its topology and corresponding control method are analyzed.Then,the topological structure of ISOP is introduced,and the conditions for realizing voltage and current sharing are analyzed.Aiming at the problem that the system cannot operate stably due to the negative impedance characteristic of the input impedance of each module of the output current sharing control(OCS),the three-loop control strategy of input voltage sharing,output current sharing and output voltage loop is proposed.Finally,the simulation verifies that the control effect of the three-loop phase shift control is obviously better than the traditional two loop phase shift control when the parameters of each module are inconsistent.