Some results obtained on the design of Power Quality Control Center (PQCC) are described. The Center, consisting of two back-to-back power converters, a DC-bus and a solid-oxide fuel cell (SOFC) distributed generator, provides varied levels of power quality services to meet the load requirements. Based on the concept of feasible operating area of the SOFC, it is shown that the ability of the PQCC to accommodate instantaneous power demand change is constrained. A feasible PQCC operating scheme is then proposed. It exploits fully the ability of the converters and the SOFC to respond to external disturbances. Furthermore, by incorporating a series compensator into the PQCC, it is shown that load ridethrough capability under voltage disturbance conditions can be extended considerably. Two possible PQCC-SC structures have been considered and simulation results are used to illustrate the efficacy of the proposed schemes.Index Terms--Power Quality Control Center, distributed generator, fuel cell, series compensator, voltage sag, unbundled power quality.
I would like to express my deep gratitude to my supervisor, Professor Choi San Shing, for his invaluable guidance, help and encouragement throughout my research. My special thanks go to Associate Professor D. M. Vilathgamuwa and Assistant Professor S. Rajakaruna, for their invaluable advice and help throughout my research. The research would not be possible without the financial support provided by Nanyang Technological University in the form of a research scholarship. For this I am most grateful. I am also deeply thankful to Ms Chew-Sim Annie, Mr.Yeoh Tiow Koon, and Mr. Lee Ting Yeng for the technical support they have given me in the course of my research. Last but not at least, to my fiancé, Heyi, for his unfailing support, patience and cooperation that have made the completion of the research work possible. And also my parents for their invaluable support and understanding over these three years or so of my graduate program.
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