双向全桥DC-DC变换器基于电感电流应力的双重移相优化控制

发布时间：2018-09-04 14:45

【摘要】：通过分析双向全桥DC-DC变换器采用单移相和双重移相控制的工作原理,推导出了两种控制方式下变换器电感电流应力与传输功率、输入与输出电压调节比及移相角比之间的数学关系。为了有效降低变换器电流应力,针对不同的传输功率及电压调节比,通过寻优求得使电感电流应力达到最小的最优移相角。据此提出一种双向全桥DC-DC变换器双重移相优化控制策略,在实现输出电压闭环控制的同时使变换器电流应力达到最小。采用该优化控制策略,双重移相控制的电流应力始终小于单移相控制,并且当变换器工作在轻载且电压调节比较大时,该优化控制策略的优势更加突出。搭建了实验样机,对理论分析进行了验证,并与传统单移相控制进行了对比。实验结果验证了所提出最优控制策略的有效性与可行性。
[Abstract]:Based on the analysis of the principle of single phase shift and double phase shift control in bi-directional full-bridge DC-DC converter, the inductance current stress and transmission power of the converter under two control modes are deduced. Mathematical relationship between input and output voltage adjustment ratio and phase shift angle ratio. In order to effectively reduce the current stress of the converter, the optimal phase shifting angle is obtained by optimizing the inductor current stress according to the different transmission power and voltage adjustment ratio. Based on this, a dual phase shift optimal control strategy for bi-directional full-bridge DC-DC converter is proposed, which realizes the closed-loop control of output voltage and minimizes the current stress of the converter. With this optimal control strategy, the current stress of dual phase shift control is always less than that of single phase shift control, and the advantages of the optimal control strategy are more prominent when the converter operates under light load and the voltage regulation is large. The experimental prototype is built and the theoretical analysis is verified and compared with the traditional single phase shift control. Experimental results demonstrate the effectiveness and feasibility of the proposed optimal control strategy.
【作者单位】：山东大学电网智能化调度与控制教育部重点实验室;
【基金】：国家自然科学基金资助项目(51177095、51541708)
【分类号】：TM46

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