Dynamic Dormancy Control Strategy of Three-Phase Staggered Parallel Bidirectional DC-DC Converter
Wang Chaoqiang1, Cao Taiqiang1, Guo Xiaoying2, Han Heguang3
1. School of Electrical Engineering and Electronic Information Xihua University Chengdu 610039 China; 2. School of Intelligent Manufacturing Panzhihua University Panzhihua 617000 China; 3. Sichuan Aviation Electrical Micro Energy Co. Ltd Chengdu 610052 China
Abstract：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 30kW 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.
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2020, Vol. 35 
