Paper Info
Title
New Submodule Selection Algorithm for Low Device Switching Frequency Modulation of Medium-Voltage Modular Multilevel Converter
Abstract
Low device switching frequency is preferred in high-power converters to achieve higher efficiency, higher device utilization, and feasible cooling system design. However, low device switching frequency operation leads to higher peak voltage in submodule (SM) capacitors of medium-voltage modular multilevel converters (MMC). The main reason is unequal distribution of energy among SMs in each fundamental period due to fewer switching commutations available for balancing. This results in increased converter cost due to higher voltage rating of SM capacitors and semiconductor devices. Therefore, the main objective of this paper is to propose a new SM selection algorithm to reduce the peak voltage of SM capacitors without significantly increasing the device switching frequency. The main idea is to avoid unnecessary switching commutations by ensuring balancing of SM capacitor voltages only at the end of charging period. The proposed algorithm has been verified with extensive simulation studies of a 5L-MMC and it has been observed that peak voltage is kept within 10 % of the nominal value while limiting the device switching frequency in the range of 350 to 400 Hz.
Year
DOI
Venue
2020
10.1109/ICIT45562.2020.9067187
2020 IEEE International Conference on Industrial Technology (ICIT)
Keywords
DocType
ISSN
Modular multilevel converter (MMC),Low device switching frequency modulation,Submodule capacitor voltage ripple minimization,synchronous optimal pulsewidth modulation (SOP)
Conference
2641-0184
ISBN
Citations 
PageRank 
978-1-7281-5755-9
0
0.34
References 
Authors
3
5
Name
Order
Citations
PageRank
Amarendra Edpuganti100.34
Vinod Khadkikar211313.14
Hatem H. Zeineldin310922.18
mohamed elmoursi4204.18
Mohamed Al Hosani532.82