软开关有源钳位逆变器逐波限流控制策略研究  

Research on Cycle-by-cycle Current Limit Strategies for Active-clamped Soft-switching Inverters

作　　者：叶怡伟 陈敏[1] 徐德鸿[1] YE Yiwei;CHEN Min;XU Dehong(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《电源学报》2024年第6期43-50,共8页Journal of Power Supply

基　　金：国家重点研发计划资助项目(2018YFB1500701)。

摘　　要：软开关有源钳位逆变器能够实现功率器件的软开关,有利于提升逆变器功率密度和动态性能。但在发生过流故障时,若采用传统的逐波限流策略,即过流时封锁功率器件的方法,将使直流母线电流由流向逆变桥变为流向直流侧。由于软开关变换器谐振电感的存在,直流母线电流与谐振电感电流叠加流过辅助开关器件,使辅助开关器件承受大电流应力。针对上述情况,提出1种改进逐波限流策略,通过改变逐波限流发生后的逆变桥开关状态,减少流向直流侧的直流母线电流,从而显著抑制电流应力,并通过3 kW软开关有源钳位逆变器实验进行了验证。The active-clamped soft-switching inverter can realize the soft-switching of power devices,which is conducive to improving the power density and dynamic performance of the inverter.However,when overcurrent occurs,if the conventional cycle-by-cycle(CBC)current limit strategy(i.e.,a strategy under which power devices will be blocked once overcurrent occurs)is adopted,the DC bus current will change its direction from flowing to the inverter bridge to flowing to the DC side.Due to the existence of a resonant inductor,both the DC bus current and the current flowing through the resonant inductor flow through the auxiliary switch,so there is high current stress on the auxiliary switch.In this paper,an improved CBC current limit strategy is proposed.By changing the switching state of the inverter bridge after the CBC current limit strategy is triggered,the DC bus current flowing to the DC side is reduced,thus significantly suppressing the current stress.In addition,the protection strategy was verified by an experiment of 3 kW active-clamped soft-switching inverter.

关 键 词：软开关有源钳位逆变器 过流 逐波限流 

分 类 号：TM464[电气工程—电器]