Title :
DC-DC modular multilevel converter with high frequency transformer for transportation applications
Author :
Yuqing Cui ; Yu Chen ; Yingzhuo Chen ; Yong Kang ; Xiaoguang Wei ; Xinying Wang
Author_Institution :
State Key Lab. of Adv. Electromagn. Eng. & Technol., Huazhong Univ. of Sci. & Technol. (HUSTThe, Wuhan, China
fDate :
Aug. 31 2014-Sept. 3 2014
Abstract :
This paper proposes the design considerations of a high-voltage-high-power dc-dc modular multilevel converter (MMC), which is consist of the half-bridge submodules and an isolation transformer. To adapt the power density requirements of the transportation applications, a modulation method with low switching frequency for submodules but high-frequency ac voltage for transformer is proposed, aiming to reduce the size of the transformer, the inductors and the dc-capacitors of the submodules. The voltage fluctuation at the dc-capacitor in such a modulation is also estimated. Finally, a design example with 10kV to 20kV voltage and 1MW rating power is given. The analysis and simulation results are matched, which shows the validity of the analysis.
Keywords :
DC-DC power convertors; power capacitors; power transformers; transportation; dc-capacitors; dc-dc modular multilevel converter; half-bridge submodules; high-frequency ac voltage; high-power MMC; inductors; isolation transformer; low switching frequency; modulation method; power 1 MW; power density requirements; transportation applications; voltage 10 kV to 20 kV; voltage fluctuation; Capacitors; Harmonic analysis; Modulation; Optimization; Reactive power; Switching frequency; Voltage control;
Conference_Titel :
Transportation Electrification Asia-Pacific (ITEC Asia-Pacific), 2014 IEEE Conference and Expo
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-4240-4
DOI :
10.1109/ITEC-AP.2014.6941010
