TY - GEN
T1 - An overlapping multi-hexagon space vector modulation scheme for modular multilevel cascade converters
AU - Efika, Ikenna Bruce
AU - Zhang, Li
AU - Watson, Alan
AU - Clare, Jon
PY - 2013/9/6
Y1 - 2013/9/6
N2 - This paper presents an adapted space vector modulation scheme for modular multilevel converters cascaded to higher levels. Instead of extending a single hexagon to the regions corresponding to the number of levels, this scheme uses multiple overlapping hexagons which are phase displaced relative to each other. The approach simplifies the modulation algorithm and brings flexibility in shaping the output voltage waveforms for different applications. The method is analyzed in simulation for modular multilevel cascaded flying capacitor converters in single star/single delta configurations, and is validated using an experimental two-tier cascaded converter. Output performance, including harmonic spectra, and the capacitor voltage balancing, compares well with those of other control schemes such as conventional multilevel SVM. A key feature is ease of extension to higher cascading levels without forfeiting overall performance.
AB - This paper presents an adapted space vector modulation scheme for modular multilevel converters cascaded to higher levels. Instead of extending a single hexagon to the regions corresponding to the number of levels, this scheme uses multiple overlapping hexagons which are phase displaced relative to each other. The approach simplifies the modulation algorithm and brings flexibility in shaping the output voltage waveforms for different applications. The method is analyzed in simulation for modular multilevel cascaded flying capacitor converters in single star/single delta configurations, and is validated using an experimental two-tier cascaded converter. Output performance, including harmonic spectra, and the capacitor voltage balancing, compares well with those of other control schemes such as conventional multilevel SVM. A key feature is ease of extension to higher cascading levels without forfeiting overall performance.
KW - high voltage power converters
KW - modulation strategy
KW - multilevel converters
KW - pulse width modulation
KW - voltage source converter
UR - http://www.scopus.com/inward/record.url?scp=84890170705&partnerID=8YFLogxK
U2 - 10.1109/EPE.2013.6634486
DO - 10.1109/EPE.2013.6634486
M3 - Conference contribution book
AN - SCOPUS:84890170705
SN - 9781479901166
T3 - 2013 15th European Conference on Power Electronics and Applications, EPE 2013
BT - Proceedings 15th European Conference on Power Electronics and Applications, EPE 2013
PB - IEEE
T2 - 2013 15th European Conference on Power Electronics and Applications, EPE 2013
Y2 - 2 September 2013 through 6 September 2013
ER -