摘要
本文针对推挽式双向DC/DC变换器中传输电感电流一个开关周期内的平均值为零,无法直接用状态空间模型描述的问题,提出一种新型的模态平均分级建模方法,通过将模态平均电流代替周期平均电流,同时遵循功率守恒的准则,将原电路解耦为前、后两级分别建模,得到变换器低阶非耦合的小信号数学模型。然后,设计以控制箝位电容电压为目标的电压电流双闭环控制器和以控制输出电压为目标的移相环控制器,并从优化系统动静态性能出发对控制器参数进行了详细的分析和设计。最后,在PSIM中搭建仿真模型,验证了所建立小信号模型的准确性和所设计控制器的有效性。
Aiming at the problem that the average value of the transfer inductor current in a push-pull bidirectional DC/DC converter in one switching cycle is zero and cannot be directly described by the state space model, a new modal average hierarchical modeling method is proposed.The period average current is replaced by the modal average current, and the inductor current AC quantity is described by each modal DC quantity.Under the principle of power conservation, the decoupling of the front and back stage circuits is realized, and the low-order uncoupled small-signal mathematical model of the converter is obtained.Then, a voltage and current double closed-loop controller aimed at controlling the clamping capacitor voltage is designed, and a phase-shifted loop controller aimed at controlling the output voltage is designed to optimize the dynamic performance of the system.The simulation model is built in PSIM,and the accuracy of the small signal model and the effectiveness of the designed controller are verified.
作者
张纯江
赵策
谢季芳
AHMAD Waseem
乔玉玺
阚志忠
ZHANG Chunjiang;ZHAO Ce;XIE Jifang;AHMAD Waseem;QIAO Yuxi;KAN Zhizhong(Key Laboratory for Power Electronics Energy Saving and Transmission Control of Hebei,Yanshan University,Qinhuangdao,Hebei 066004,China)
出处
《燕山大学学报》
CAS
北大核心
2021年第3期227-235,共9页
Journal of Yanshan University
基金
国家自然科学基金资助项目(51877187)。
