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Fourier Series Modeling and Controller Design ofModular Multilevel DC Transformer(PDF)

南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2020年04期
Page:
22-29
Research Field:
电气工程
Publishing date:

Info

Title:
Fourier Series Modeling and Controller Design ofModular Multilevel DC Transformer
Author(s):
Wu Xingyu1; Min Fuhong1; Wang Guoning2; Wang Zhigang2; Hou Kai2
(1.NARI Electrical and Automation Engineering,Nanjing Normal University,Nanjing 210023,China)(2.NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China)
Keywords:
modular multilevel DC transformer; Fourier series; PI controller
PACS:
TM46
DOI:
10.3969/j.issn.1672-1292.2020.04.004
Abstract:
The modular multilevel DC transformer is studied,which is composed of two phase modular multilevel converter,high frequency isolation transformer and parallel full-bridge module. The modular multilevel bridge adopts quasi-square wave modulation,and the parallel full-bridge module adopts square wave modulation. Based on the Fourier series analysis,the operating principle and power characteristics under single phase shift control are analyzed. The mathematical model of modular multilevel DC transformer under single phase shift control is established by using the method of Fourier series summation,and the transfer function from single phase shift control to output voltage is obtained. Based on the open loop transfer function,the PI controller is designed to control the output voltage. Finally,the simulation model of modular multilevel DC transformer is built in MATLAB/Simulink. The simulation result shows that the output voltage of the DC transformer is stable with designed PI controller.

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Last Update: 2020-12-15