Title :
A hybrid Modulation method for improved modular multilevel converter applied for power quality compensation in medium voltage
Author :
Yunbo Long ; Xiangning Xiao ; Yonghai Xu ; Yunfei Xu ; Baolai Yu
Author_Institution :
State Key Lab. of Alternate Electr. Power Syst. with Renewable Energy Sources, North China Electr. Power Univ., Beijing, China
Abstract :
In this paper, an improved MMC structure is presented for power quality compensation in medium voltage, which has a special SubModule working in High Switching Frequency (SM-HSF) and N SubModules (SMs) in each arm. Then, a hybrid Modulation method in which Pulse Width Modulation (PWM) for SM-HSF is combined with Nearest Level Modulation (NLM) for SMs is introduced for this improved MMC structure. It can output the same voltage waveform with less harmonics than modulated by NLM, lower switching frequency and losses level than CPS-PWM. In order to confirm the modulation method, a series of modules are established in PSCAD/EMTDC.
Keywords :
PWM power convertors; compensation; power supply quality; power system harmonics; switching convertors; CPS-PWM; NLM; PSCAD-EMTDC; SM-HSF; hybrid modulation method; improved MMC structure; improved modular multilevel converter; medium voltage power quality compensation; nearest level modulation; pulse width modulation; special submodule working in high switching frequency; voltage waveform; Capacitors; EMTDC; Frequency modulation; PSCAD; Switches; Voltage control; Hybrid Modulation; Modular Multilevel Converter; Nearest Level Modulation; Pulse Width Modulation;
Conference_Titel :
Future Energy Electronics Conference (IFEEC), 2013 1st International
Conference_Location :
Tainan
Print_ISBN :
978-1-4799-0071-8
DOI :
10.1109/IFEEC.2013.6687609
