电能路由器公共高频母线超瞬态过程机理及抑制措施

Mechanism and Suppression Strategy of the Ultra-transient Behavior of High-frequency-bus in Electric Energy Router

作为一种新型拓扑,基于模块化多有源桥的共高频母线结构正被应用于多端口电能路由器领域。由于H桥桥臂输出电压突变,会造成高频变压器内部集成的移相电感和分布电容产生自由振荡,从而引起高频母线电压出现数MHz的超瞬态过渡过程,极易造成电磁干扰、触发驱动板故障,对模块规模化的高压大容量电能路由器的可靠性产生严重负面影响。该文首先对振荡支路的分布参数网络进行简化等效,并建立超瞬态过程的时域模型,对其产生机理进行了深入研究;其次,基于时域模型,分析这类超瞬态行为的主要影响因素,并通过时间尺度的转换,提出一种在高频母线上并联"不控整流(10)阻尼电阻"的抑制措施,介绍了阻尼电阻的设计方法;同时,给出关键分布参数和瞬态行为的关系,有助于实现高频变压器参数的提取和科学设计;最后,通过模块级、装置级实验分别对两端口和多端口拓扑结构进行验证,证明理论分析的准确性和抑制措施的有效性、实用性。

The modular multi-active-bridge(MMAB)based high-frequency bus(HFB)topology is preferred to be applied to the electric power router(EER).However,the sudden change of the H-bridge voltage will cause serious free-oscillation of HFB voltage,which is produced by distributed capacitance and inductance of the high-frequency transformer(HFT).The time scale of oscillation is much smaller than that of the H-bridge control period known as the transient behavior.Therefore,it can be regarded as an ultra-transient behavior of the HFB.The ultra-transient process can easily cause electromagnetic interference(EMI)and trigger drive failures,thus damaging the reliability of the system.In this paper,firstly,the distributed parameter network of the oscillation branch was simplified,and the mathematical model of the ultra-transient process was deeply studied.Secondly,based on the mathematical model,the main factors influencing the ultra-transient behavior were analyzed,and through the conversion of time-scale,an oscillation attenuation countermeasure of"uncontrolled rectifier&damping resistor"in parallel on the high-frequency bus was proposed,and the design method of damping resistance was introduced.At the same time,the relationships between the distribution parameters of HFT and the transient process of HFB were presented.Finally,experiments performed on the module-level and device-level prototypes verified the effectiveness and practicality of the proposed theoretical analysis and attenuation strategy.