Title :
A novel PWM scheme to eliminate common-mode voltages in cascaded multi-level inverters
Author :
Wang, Z.H. ; Yin, X.G. ; Cheng, H.X. ; Zhang, Z. ; Yang, J.C.
Author_Institution :
Dept. of Electr. & Electron. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
In this paper, mechanism of common-mode voltage of voltage source inverter is discussed in details, and it is pointed out that among the pulse width modulation (PWM) strategies for cascaded multi-level inverters (CMLI), those who based on inphase modulation of power-cell can cause common-mode voltage. Also, a novel SPWM for reducing common-mode voltage of cascaded multi-level inverter is presented, the proposed SPWM strategy using non-inphase modulation signals and third harmonic injection can totally eliminate common-mode voltage without extra hardware, and maintain high utilizing ratio of DC-Link voltage simultaneously. Theoretical analysis, simulation results are presented to verify the proposed strategy.
Keywords :
PWM invertors; PWM scheme; cascaded multilevel inverters; common-mode voltages; noninphase modulation signals; pulse width modulation; third harmonic injection; voltage source inverter; Analytical models; Circuit topology; Electromagnetic interference; Hardware; Power harmonic filters; Protective relaying; Pulse inverters; Pulse width modulation inverters; Voltage control; Zero voltage switching;
Conference_Titel :
Transmission and Distribution Conference and Exposition, 2003 IEEE PES
Print_ISBN :
0-7803-8110-6
DOI :
10.1109/TDC.2003.1335374