The inherent low switching frequency in mediumvoltage alternating-current industrial drives presents powerquality and filter-design challenges. In this paper, four multilevel pulsewidth-modulation methods; phase disposition (PD), switching-loss minimization (SLM), and selective harmonic elimination (SHE) up to the 17th and 29th harmonics, respectively, are considered. The characteristics of long-cable effects on commonmode voltage (CMV) and differential-mode voltage (DMV), inverter losses and efficiency, induction machine voltage, and current harmonics are analyzed. Very little has been published in these quantitative comparisons. It is shown that the SHE method has reduced CMV as compared with the PD and SLM algorithms. Elimination of up to the 29th harmonic achieves the best harmonic performance without needing an output filter, at the expense that the losses are higher with a lower efficiency. Analytical and simulation results using the Piecewise Linear Electrical Circuit Simulation for the power-electronic circuits and MATLAB/Simulink for control systems are experimentally verified with a 1000-hp 4160-V neutral-point-clamped adjustablespeed-drive system that includes a 24-pulse front-end voltage source converter.Index Terms-Harmonics, multilevel pulsewidth modulation, power quality, three-level neutral-point-clamped medium-voltage drives.
The inherent low switching frequency in medium voltage (MV) alternating current (AC) industrial drives presents power quality and filter design challenges. In this paper, four multilevel pulse width modulation (PWM) methods: Phase Disposition (PD), Switching Loss Minimization (SLM), Selective Harmonic Elimination (SHE) up to 17 th and 29 th harmonics respectively are considered. The characteristics of long cable effects on common mode voltage (CMV) and differential mode voltage (DMV), inverter losses and efficiency, induction machine (IM) voltage and current harmonics are analyzed. Very little has been published in these quantitative comparisons.It is shown that the SHE method has reduced CMV as compared to the PD and SLM algorithms. Up to 29th harmonic elimination achieves the best harmonics performance without needing an output filter, at the expense that the losses are higher with a lower efficiency. Analytical and simulation results using PLECS for the power electronics circuits and Matlab/Simulink for control systems are verified experimentally with a 1000hp, 4160V neutral point clamped (NPC) adjustable-speed drive (ASD) system that includes a 24-pulse front-end voltage source converter.
In this paper, four multilevel pulse-width-modulation methods are quantitatively characterized and compared: phase opposition disposition (POD), Space vector modulation with switching loss minimization (SVPWM-SLM), and selective harmonic elimination (SHE) of non-triplen harmonics up to the 15th and 27th harmonics, respectively. Inverter losses and efficiency, induction machine voltage, and current harmonics are analyzed. Analytical and simulation results using PLECS and MATLAB/Simulink for control systems are experimentally verified with a 1000-hp 4160-V neutralpoint-clamped (NPC) adjustable-speed-drive (ASD) system.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.