DC active power filter based on model predictive control for DC bus overvoltage suppression of accelerator grid power supply  

作　　者：张鸿淇 朱帮友 马少翔 李志恒 张明 潘垣 Hongqi ZHANG;Bangyou ZHU;Shaoxiang MA;Zhiheng LI;Ming ZHANG;Yuan PAN(International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics,State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,People's Republic of China)

机构地区：[1]International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics,State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,People's Republic of China

出　　处：《Plasma Science and Technology》2023年第6期1-13,共13页等离子体科学和技术（英文版）

基　　金：supported in part by the National Key Research and Development Program of China(No.2017YFE0300104);in part by National Natural Science Foundation of China(No.51821005)。

摘　　要：The China Fusion Engineering Test Reactor plans to build a 200 k V/25 A acceleration grid power supply(AGPS)for the negative-ion-based neutral beam injector prototype system.The AGPS uses a rectifier-inverter-isolated step-up structure.There is a DC bus between the rectifier and the inverter.In order to limit DC bus voltage ripple and transient fluctuations,a large number of capacitors are used,which degrades the reliability of the power supply and occupies a large amount of space.This work finds that due to the difference in the turn-off time of the rectifier and the inverter,the capacitance mainly depends on the rectifier current when the inverter is turned off.On this basis,an active power filter(APF)scheme is proposed to absorb the current.To enhance the dynamic response ability of the APF,model predictive control is adopted.In this paper,the circuit structure of the APF is introduced,the prediction model is deduced,the corresponding control strategy and signal detection method are proposed,and the simulation and experimental results show that APF can track the transient current of the DC bus and reduce the voltage fluctuation significantly.

关 键 词：CFETR NBI accelerator grid power supply power active filter model predictive control 

分 类 号：TM761[电气工程—电力系统及自动化] TN713.8[电子电信—电路与系统]