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This paper presents the generalized solutions for nonlinear equations of pulse-width-modulation (PWM) switching technique in the cascaded multicell multilevel converters which are modulated under the selective harmonic elimination (SHE) method. The provided solutions are used to explore the total harmonic distortion (THD) of line-to-line voltages in three-phase cascaded multilevel converters. First,...
`Thin' power electronics concentrates on the design of minimal and cost effective power converters. Part of the research effort targets the direct processing of an AC input to an AC output without the use of an intermediate DC stage. Particular examples include the inverterless active filter and the controllable network transformer, both of which in their simplest form employ a buck switcher as the...
Inverters are power devices used for many industrial applications such as power conversion, the speed control of induction motors etc. When a magnetic device is energized by an inverter power supply, its magnetic core is subjected to additional core losses due to harmonic contents. One solution to this problem may be the selective harmonic elimination based on the simultaneous solution of non-linear...
For high power inverters, optimal pulse width modulation (OPWM) is the most popular method to reduce the switching frequency and at the same time realize selected harmonics cancellation. Most published methods for optimal PWM are based on solving multiple variable and high order nonlinear equations. This paper proposes a practical harmonics injection and equal area criteria based method to realize...
As the work frequency is very low, the Optimal Unsymmetrical PWM Method is suitable to be applied in high-power situation requiring control of fundamental and harmonics simultaneously, which will reduce the switch loss and the EMI greatly. Because of the low work frequency, the optimal unsymmetrical PWM method requires optimizing each independent switch angle in order to achieve good control effect,...
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