Analysis and Operation of Modular Multilevel Converters With Phase-Shifted Carrier PWM

被引:171
作者
Ilves, Kalle [1 ]
Harnefors, Lennart [2 ]
Norrga, Staffan [1 ]
Nee, Hans-Peter [1 ]
机构
[1] Royal Inst Technol KTH, Elect Energy Convers Lab, SE-10044 Stockholm, Sweden
[2] ABB Corp Res Ctr, SE-72178 Vasteras, Sweden
关键词
Capacitor voltages; circulating current; modular multilevel converter (M2C); phase-shifted PWM; switching harmonics; VOLTAGE;
D O I
10.1109/TPEL.2014.2321049
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Many publications have been presented on the modulation and control of the modular multilevel converter, some of which are based on phase-shifted carrier modulation. This paper presents an analysis of how the switching frequency affects the capacitor voltages, circulating currents, and alternating voltages using phase-shifted carrier modulation. It is found that switching frequencies that are integer multiples of the fundamental frequency should be avoided as they can cause the capacitor voltages to diverge. Suitable switching frequencies are derived for which the arm and line quantities will be periodic with symmetric operating conditions in the upper and lower arms. Thus, the practical outcome of this paper is a detailed description of how the switching frequency should be chosen in order to achieve advantageous operating conditions. The theoretical results from the analysis are validated by both simulations and experimental results.
引用
收藏
页码:268 / 283
页数:16
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