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Control and Modulation of Modular Multilevel Converters
The integration of renewable energy sources in the electrical grid is reducing our dependence on fossil fuels. However, to ensure feasibility and reliability of distributed energy generation, more efficient and higher power converters are required. The modular multilevel converter (07C) is a modern topology of multilevel converter that is very attractive for medium- and high-voltage/power applications, including high-voltage direct current transmission systems and high-power motor drives. The main features of the 07C are modularity, scalability to different power and voltage levels, redundancy and high quality output voltages and currents. However, the operation of the 07C is complex, and th...
Gulls Simplified
A simpler and more user-friendly visual approach to gull identification This unique photographic field guide to North America’s gulls provides a comparative approach to identification that concentrates on the size, structure, and basic plumage features of gulls—gone are the often-confusing array of plumage details found in traditional guides. Featuring hundreds of color photos throughout, Gulls Simplified illustrates the variations of gull plumages for a variety of ages, giving readers strong visual reference points for each species. Extensive captions accompany the photos, which include comparative photo arrays, digitized photo arrays for each age group, and numerous images of each spec...
