Title :
An investigation of high efficiency DC-AC converters for LVDC distribution networks
Author :
Yanni Zhong ; Finney, Stephen ; Holliday, Derrick
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. of Strathclyde, Glasgow, UK
Abstract :
Low voltage DC (LVDC) distribution systems offer improved efficiency and reliability in smart grids. A major challenge facing LVDC systems is DC-AC conversion. A study of an effective low voltage DC-AC converter is therefore presented. Modular Multilevel Converter (MMC) performance (in particular power loss) is compared with a conventional IGBT-based 2-level converter and its advantages highlighted. A phase-shifted sinusoidal PWM based individual voltage balancing strategy for the MMC is presented. A proportional-resonant controller is introduced to eliminate the 2nd harmonic circulating current in the H-bridge MMC converter.
Keywords :
DC-AC power convertors; insulated gate bipolar transistors; power distribution reliability; smart power grids; 2nd harmonic circulating current; DC-AC conversion; H-bridge MMC converter; IGBT-based 2-level converter; LVDC distribution networks; LVDC systems; MMC performance; high efficiency DC-AC converters; low voltage dc distribution systems; modular multilevel converter performance; phase-shifted sinusoidal PWM; proportional-resonant controller; smart grids; voltage balancing strategy; Capacitor Voltage Balance Control; LVDC; Loss Calculation; MMC;
Conference_Titel :
Power Electronics, Machines and Drives (PEMD 2014), 7th IET International Conference on
Conference_Location :
Manchester
Electronic_ISBN :
978-1-84919-815-8
DOI :
10.1049/cp.2014.0283
