The developments of Flexible AC Transmission System (FACTS) devices, medium voltage drives, and different types of distributed generations, have provided great opportunities for the implementations of medium and high power inverters. In these applications, the frequency of the Pulse Width Modulation (PWM) is often limited by switching losses and electromagnetic interferences caused by high dv/dt. Thus, to overcome these problems, Selective Harmonic Elimination (SHE) is often utilized in both two-level inverters and multilevel inverters to reduce the switching frequency and the Total Harmonic Distortion. For both two level and multilevel inverters, most SHE studies are based on solving multiple variable high order nonlinear equations. Furthermore, for multilevel inverters, SHE has been often studied based on the assumption of balanced dc levels and single switching per level. This dissertation addresses the further developed harmonics injection and equal area criteria based four-equation method to realize SHE for two-level inverters and multilevel inverters with unbalanced dc sources. Compared with existing methods, the proposed method does not involve complex equation groups and is much easier to be utilized in the case of large number of switching angles or multiple switching angles per voltage level in multilevel inverters.
Then, the proposed method is applied for optimal PWM when the number of dc level ins limited for the inverters. For harmonics compensation for active power filters, the proposed method is modified for selective harmonics generation based on distributed energy resources. Different real-time simulation and experimental results verify the simplicity and accuracy of the proposed method for these approaches. By using advanced instantaneous power theory, the four-equation based method can be used as a comprehensive and universal solution for reliable and efficient power delivery in smart grids.
|Commitee:||Kasten, Donald, Sugarbaker, Evan, Utkin, Vadim, Wang, Jin, Xu, Longya|
|School:||The Ohio State University|
|Department:||Electrical and Computer Engineering|
|School Location:||United States -- Ohio|
|Source:||DAI-B 78/11(E), Dissertation Abstracts International|
|Subjects:||Engineering, Electrical engineering|
|Keywords:||Elimination, Harmonics, High power, Inverters, Method, Selective, Universal|
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