Frequency Only Converter

In this book, a frequency only converter is proposed to optimize the HVDC transmission system, and to improve the efficiency of power generation system. The context is given by combining two original solutions; the first one, using a natural harmonic cancellation, consists on connecting in series two classical frequency inverters which are coupled to the grid through a specific transformer connection. The second solution is achieved by using three, five or more level converters in order to eliminate some selective harmonics by optimizing a switching angle. The proposed converter uses Square Wave Modulation so as to keep the switching losses to a minimum value, and to achieve high efficiency. Experimental results indicate that the proposed HVDC transmission systems offer high efficiency, unity power factor and better current and voltage quality with fewer harmonics. This book summarizes some results of a research work, published with Alfred Rufer, an honorary professor at EPFL, in several papers, in the fields of power electronics and electrical engineering. It is intended for researchers, professors and graduate students on electrical engineering and power electronics.