基于最大均流法的DC/DC变换器并联系统研究

【作者】 王宇飞；

【导师】 温旭辉； 许海平；

【作者基本信息】 中国科学院研究生院（电工研究所） ， 电机与电器， 2004， 硕士

【摘要】 DC／DC变换器的并联技术是提高DC／DC变换器功率等级的有效途径，而如何实现并联模块间输出电流的平均分配是实现并联的核心技术。目前的并联均流技术多是在并联模块参数差异不大的情况下实现的，对于并联系统在并联模块参数差异较大的极限情况下的稳态和暂态性能则很少涉及。 本文着重对并联系统在参数差异很大的条件下的工作情况进行了研究。首先利用基于状态空间平均法的小信号分析对最大均流法的均流原理进行了分析，并对并联系统的稳定性进行了讨论。之后针对已有的均流方案的局限性提出了一种新的具有限流功能的三环控制均流策略。为了验证所提出的方案的可行性，建立了MATLAB仿真平台，利用模块化仿真的思想进行了系统仿真，初步验证了方案的合理性。最后搭建了实际的DC／DC并联系统试验平台，对采用该方案的并联系统的稳态和暂态性能进行了全面的考察，得到了令人满意的结果，证明了具有限流功能的三环控制均流策略是切实可行的。更多还原

【Abstract】 The application of the paralleled DC/DC converter system is a good way to enhance the power level of the DC/DC converter. How to archive the current sharing between the paralleled converters is the key technology. At present most current sharing are archived in the condition that the differences of the converters are not very large. The performances of the paralleled DC/DC converter system are seldom discussed when the differences of the paralleled modules are large.This paper analyzes the principle of the current sharing using the small signal analysis based on the state-space average model and discusses the stability of the paralleled DC/DC converter system. Then a novel three-loop current sharing scheme with current limiting function is presented aiming at the limitation of the former current sharing schemes. In order to verify the feasibility of the scheme, a stimulation platform in MATLAB is built and the stimulation is made to test the performance of the paralleled DC/DC converter system on it. Finally an experimental platform is built to test the steady and transient performance of the paralleled DC/DC converter system. The result of the experiment is satisfying. The novel current sharing scheme is proved to be workable.更多还原