三相交错并联双向DC-DC变换器动态休眠控制策略

Dynamic Dormancy Control Strategy of Three-Phase Staggered Parallel Bidirectional DC-DC Converter

飞机地面静变电源系统中三相交错并联双向DC-DC变换器具有较高的额定功率和直流母线电压,对开关器件匹配的要求极高。针对变换器工作时开关器件长时间处于导通关断的状态导致其工作寿命缩短的问题,提出了一种相应的动态休眠控制策略。该文对三相交错并联双向DC-DC变换器工作原理进行了详细分析,建立数学模型,加入电流环动态休眠控制环节,制定动态休眠双闭环控制策略,相比传统双闭环控制策略,各个开关器件均处于动态休眠状态,有效地延长了开关器件和变换器工作寿命。最后搭建了Matlab/Simulink仿真平台和30kW实验样机,对理论分析结果进行了实验验证。实验中变换器的所有开关器件均实现了动态休眠且轻载条件下开关次数仅为传统双闭环控制策略的1/3,其工作寿命提高了200%;半载条件下开关次数为传统双闭环控制策略的2/3,其工作寿命提高了50%;满载条件下开关次数与传统双闭环控制策略相同。

In the energy storage system of aircraft ground static variable power supply,the three-phase staggered parallel bidirectional DC-DC converter owns higher rated power and DC bus voltage, which has high matching requirements for switching devices. A dynamic sleeping control strategy is proposed to tackle the shortened working life of the converter when the switching device is in the state of breaking for a long time. In this paper, the working principle of the three-phase alternating parallel bidirectional DC-DC converter is analyzed in detail, the mathematical model is set up to add the current loop dynamic dormancy control links, develop control strategy of dynamic dormancy double closed-loop.Compared with the traditional control strategy of double closed-loop, the switching devices are in dynamic dormant state, which effectively extend the working life of the switching devices and the converter. Finally, a Matlab/Simulink simulation platform and a 30 kW experimental prototype are built to verify the theoretical analysis results. In the experiment, all switching devices of the converter realized dynamic sleep and the switching times under light load were only 1/3 of the traditional double closed-loop control strategy, and the working life of switching devices was increased by 200%. Under the half-load condition, the switching times are 2/3 of the traditional double-closed-loop control strategy, and its working life is increased by 50%. The switching times under full load are the same as the traditional double closed loop control strategy.