DocumentCode :
647743
Title :
Modulation and control for a new hybrid cascaded multilevel converter with DC blocking capability
Author :
Yinglin Xue ; Zheng Xu ; Qingrui Tu
Author_Institution :
Dept. of Electr. Eng., ZheJiang Univ., Hangzhou, China
fYear :
2013
fDate :
21-25 July 2013
Firstpage :
1
Lastpage :
1
Abstract :
Summary form only given. The hybrid cascaded multilevel converter is a newly introduced voltage-source converter with dc blocking capability. It has two key parts, that is, the director switch (DS) made of insulated-gate bipolar transistors in series and the wave-shaping circuit (WSC) containing stacks of full-bridge submodules (FSMs). This paper focuses on the modulation schemes of the DSs and the WSCs. First, to reduce switching losses of the DSs, a novel asymmetrical square-wave modulation at a very low frequency is proposed, and the energy flow of the WSC under this modulation is analyzed. Second, modified phase-shifted carrier-based pulse width modulation (PSC-PWM) is presented to determine the number of FSMs to be inserted or bypassed; and the specified FSMs to be fired are selected according to the capacitor voltage-balancing strategy. Third, the capability to limit the short-circuit current during the dc fault is investigated, and fast ac overcurrent protection is designed. The effectiveness of the modulation and control strategies is verified by PSCAD/EMTDC simulations.
Keywords :
insulated gate bipolar transistors; phase convertors; power bipolar transistors; DC blocking; EMTDC; PSCAD; asymmetrical square-wave modulation; capacitor voltage-balancing; director switch; full-bridge submodules; hybrid cascaded multilevel converter; insulated-gate bipolar transistors; overcurrent protection; phase-shifted carrier-based pulse width modulation; short-circuit current; switching losses; voltage-source converter; wave-shaping circuit; Control systems; Decision support systems; Educational institutions; Electrical engineering; Modulation; Switching circuits; Voltage control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power and Energy Society General Meeting (PES), 2013 IEEE
Conference_Location :
Vancouver, BC
ISSN :
1944-9925
Type :
conf
DOI :
10.1109/PESMG.2013.6672273
Filename :
6672273
Link To Document :
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